Journal of The Energy Institute最新文献

Comprehensive performance investigation of inexpensive oxygen carrier in chemical looping gasification of coal 煤化学循环气化中廉价氧载体的综合性能研究

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-14 DOI: 10.1016/j.joei.2024.101899

Yanan Wang , Jiawei Zhou , Jun Hu , Haibo Zhao

Coal chemical looping gasification (CLG) using inexpensive oxygen carrier (OC) is a promising technology to obtain H₂-rich syngas, and the OCs of copper/iron ore composite with an autothermal capability and red mud have been screened as the potential candidates in our previous investigation. However, the detailed synergetic effect between copper ore and iron ore, and the effect of reaction conditions on syngas production at different reactor scales are still unclear. In this work, the synergetic effect between copper ore and iron ore in composite OCs with different mixing ratios are detailedly investigated through H₂ temperature-programmed reduction (TPR) tests. The results indicate that the copper ore addition can contribute the reduction of iron ore and form a new phase of CuFe₂O₄ between CuO in the copper ore and Fe₂O₃ in the iron ore, meanwhile observing the composite OC of Cu20Fe80@C generating a stronger synergetic effect in comparison to adjencent OCs. Moreover, the optimization of reaction conditions are conducted in a batch fluidized bed reactor (BFBR) by regulating the temperature, oxygen to fuel (O/F) ratio, and steam concentration for the Cu20Fe80@C and red mud OCs. It is found that a higher temperature is conducive to improving the coal conversion and syngas yield on the whole, but not the H₂-rich syngas production. While a lower O/F ratio favors the preparation of H₂-rich syngas, and the optimal steam concentration is determined as 50 vol% for both OCs under comprehensive consideration of gasification time, syngas yield and heating cost. Additionally, the copper/iron ore composite OC with excellent CLG performance and bed stability is further confirmed in a semi-continuous fluidized bed reactor (SFBR), which shows the effects of temperature and O/F ratio on syngas production similar to those in BFBR. In summary, the promising copper/iron ore composite OC exhibits good adjustability and adaptability for CLG process in terms of reaction conditions and reactor scales, respectively.

使用廉价的氧载体（OC）进行煤化学循环气化（CLG）是一种获得富含 H2- 合成气的有前途的技术。然而，铜矿与铁矿之间的详细协同效应以及不同反应器规模下反应条件对合成气产量的影响仍不清楚。本研究通过 H2 温度编程还原（TPR）试验详细研究了铜矿石和铁矿石在不同混合比的复合 OC 中的协同效应。结果表明，铜矿石的加入可以促进铁矿石的还原，并在铜矿石中的 CuO 和铁矿石中的 Fe2O3 之间形成新的 CuFe2O4 相，同时观察到 Cu20Fe80@C 的复合 OC 与邻近的 OC 相比产生了更强的协同效应。此外，在间歇式流化床反应器（BFBR）中，通过调节 Cu20Fe80@C 和赤泥 OC 的温度、氧/燃料（O/F）比和蒸汽浓度，对反应条件进行了优化。研究发现，较高的温度有利于提高煤炭转化率和合成气产量，但不利于提高富含 H2- 的合成气产量。在综合考虑气化时间、合成气产量和加热成本的情况下，两种 OC 的最佳蒸汽浓度均为 50vol%。此外，在半连续流化床反应器（SFBR）中进一步证实了铜/铁矿石复合 OC 具有优异的 CLG 性能和床层稳定性，其温度和 O/F 比对合成气产量的影响与 BFBR 相似。总之，前景广阔的铜/铁矿石复合 OC 在反应条件和反应器规模方面分别表现出良好的可调性和适应性，适用于 CLG 工艺。

{"title":"Comprehensive performance investigation of inexpensive oxygen carrier in chemical looping gasification of coal","authors":"Yanan Wang , Jiawei Zhou , Jun Hu , Haibo Zhao","doi":"10.1016/j.joei.2024.101899","DOIUrl":"10.1016/j.joei.2024.101899","url":null,"abstract":"<div><div>Coal chemical looping gasification (CLG) using inexpensive oxygen carrier (OC) is a promising technology to obtain H<sub>2</sub>-rich syngas, and the OCs of copper/iron ore composite with an autothermal capability and red mud have been screened as the potential candidates in our previous investigation. However, the detailed synergetic effect between copper ore and iron ore, and the effect of reaction conditions on syngas production at different reactor scales are still unclear. In this work, the synergetic effect between copper ore and iron ore in composite OCs with different mixing ratios are detailedly investigated through H<sub>2</sub> temperature-programmed reduction (TPR) tests. The results indicate that the copper ore addition can contribute the reduction of iron ore and form a new phase of CuFe<sub>2</sub>O<sub>4</sub> between CuO in the copper ore and Fe<sub>2</sub>O<sub>3</sub> in the iron ore, meanwhile observing the composite OC of Cu20Fe80@C generating a stronger synergetic effect in comparison to adjencent OCs. Moreover, the optimization of reaction conditions are conducted in a batch fluidized bed reactor (BFBR) by regulating the temperature, oxygen to fuel (O/F) ratio, and steam concentration for the Cu20Fe80@C and red mud OCs. It is found that a higher temperature is conducive to improving the coal conversion and syngas yield on the whole, but not the H<sub>2</sub>-rich syngas production. While a lower O/F ratio favors the preparation of H<sub>2</sub>-rich syngas, and the optimal steam concentration is determined as 50 vol% for both OCs under comprehensive consideration of gasification time, syngas yield and heating cost. Additionally, the copper/iron ore composite OC with excellent CLG performance and bed stability is further confirmed in a semi-continuous fluidized bed reactor (SFBR), which shows the effects of temperature and O/F ratio on syngas production similar to those in BFBR. In summary, the promising copper/iron ore composite OC exhibits good adjustability and adaptability for CLG process in terms of reaction conditions and reactor scales, respectively.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101899"},"PeriodicalIF":5.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic recovery of renewable hydrocarbon resources via co-pyrolysis of non-edible linseed and waste polypropylene: A study on influence of plastic on oil production and their utilization as a fuel for IC engine 通过非食用亚麻籽和废聚丙烯的共热解协同回收可再生碳氢化合物资源：塑料对石油生产的影响及其用作集成电路发动机燃料的研究

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-14 DOI: 10.1016/j.joei.2024.101905

S. Mehanathan , P. Madhu , C. Sowmya Dhanalakshmi , R. Vijayakumar

This study looked into the co-pyrolysis of linseed and polypropylene to produce pyrolysis oil as a fossil fuel substitute for IC engines. The outcomes showed positive synergistic benefits on oil yield from co-pyrolysis as compared to the pyrolysis of individual components. Initially, the study investigated the effect on polypropylene during co-pyrolysis with linseed at temperatures between 350 °C and 650 °C under different blend ratios. The maximum oil yields for the pyrolysis of linseed and polypropylene obtained were 61.1 wt% and 73.6 wt%, respectively, whereas the maximum positive synergy on oil yield was 6.2 % at 2:3 blend ratio. Fourier transform infrared spectroscopy (FT-IR), gas chromatography mass spectrometry (GC-MS), and physical characteristics were used to further evaluate the pyrolysis oil produced at maximum synergy. It was found that the oil had a higher calorific value of 43.09 MJ/kg, which was fairly close to fossil diesel. For engine analysis, eight different blends containing pyrolysis oil and graphene oxide (GO) nanoparticles were prepared and named PyroD20 (20 % co-pyrolysis oil + 80 % diesel), PyroD40, PyroD50, PyroD20@20 (PyroD20 + 20 ppm GO), PyroD20@40, PyroD20@60, PyroD20@80, and PyroD20@100. After that, an engine test was conducted on the blended fuels to compare them to the baseline diesel fuel (D). At maximum load, the brake thermal efficiency (BTE) for PyroD20 and PyroD20@60 was found to be 37.2 % and 37.8 %, respectively, which was 6.0 % and 7.8 % higher than those of D. The brake-specific fuel consumption (BSFC) for PyroD20 and PyroD20@60 was reduced by up to 22.0 % and 22.7 %, respectively, compared to D. With the use of PyroD20@60, the emissions of carbon monoxide (CO), hydrocarbon (HC), and smoke were reduced by up to 27.0 %, 7.3 %, and 21.2 %, respectively. The produced renewable liquid oil may certainly be used in blends with conventional diesel for IC engine operation.

这项研究探讨了亚麻籽和聚丙烯的联合热解，以生产热解油，作为集成电路发动机的化石燃料替代品。研究结果表明，与单独热解亚麻籽和聚丙烯相比，联合热解对产油量具有积极的协同效益。首先，研究调查了在 350 °C 至 650 °C 的温度下，亚麻籽在不同混合比例下进行共热解时对聚丙烯的影响。亚麻籽和聚丙烯热解获得的最大油产率分别为 61.1 wt% 和 73.6 wt%，而当混合比为 2:3 时，油产率的最大正协同效应为 6.2%。傅立叶变换红外光谱法（FT-IR）、气相色谱质谱法（GC-MS）和物理特性被用来进一步评估在最大协同作用下产生的热解油。结果发现，这种油的热值较高，为 43.09 兆焦/千克，与化石柴油相当接近。为进行发动机分析，制备了八种不同的含热解油和氧化石墨烯（GO）纳米颗粒的混合物，分别命名为 PyroD20（20 % 共热解油 + 80 % 柴油）、PyroD40、PyroD50、PyroD20@20（PyroD20 + 20 ppm GO）、PyroD20@40、PyroD20@60、PyroD20@80 和 PyroD20@100。随后，对混合燃料进行了发动机测试，以将它们与基准柴油（D）进行比较。在最大负荷下，PyroD20 和 PyroD20@60 的制动热效率（BTE）分别为 37.2 % 和 37.8 %，比 D 高 6.0 % 和 7.8 %。使用 PyroD20@60 后，一氧化碳 (CO)、碳氢化合物 (HC) 和烟的排放量分别减少了 27.0%、7.3% 和 21.2%。生产出的可再生液态油可以与传统柴油混合使用，用于集成电路发动机的运行。

{"title":"Synergistic recovery of renewable hydrocarbon resources via co-pyrolysis of non-edible linseed and waste polypropylene: A study on influence of plastic on oil production and their utilization as a fuel for IC engine","authors":"S. Mehanathan , P. Madhu , C. Sowmya Dhanalakshmi , R. Vijayakumar","doi":"10.1016/j.joei.2024.101905","DOIUrl":"10.1016/j.joei.2024.101905","url":null,"abstract":"<div><div>This study looked into the co-pyrolysis of linseed and polypropylene to produce pyrolysis oil as a fossil fuel substitute for IC engines. The outcomes showed positive synergistic benefits on oil yield from co-pyrolysis as compared to the pyrolysis of individual components. Initially, the study investigated the effect on polypropylene during co-pyrolysis with linseed at temperatures between 350 °C and 650 °C under different blend ratios. The maximum oil yields for the pyrolysis of linseed and polypropylene obtained were 61.1 wt% and 73.6 wt%, respectively, whereas the maximum positive synergy on oil yield was 6.2 % at 2:3 blend ratio. Fourier transform infrared spectroscopy (FT-IR), gas chromatography mass spectrometry (GC-MS), and physical characteristics were used to further evaluate the pyrolysis oil produced at maximum synergy. It was found that the oil had a higher calorific value of 43.09 MJ/kg, which was fairly close to fossil diesel. For engine analysis, eight different blends containing pyrolysis oil and graphene oxide (GO) nanoparticles were prepared and named PyroD20 (20 % co-pyrolysis oil + 80 % diesel), PyroD40, PyroD50, PyroD20@20 (PyroD20 + 20 ppm GO), PyroD20@40, PyroD20@60, PyroD20@80, and PyroD20@100. After that, an engine test was conducted on the blended fuels to compare them to the baseline diesel fuel (D). At maximum load, the brake thermal efficiency (BTE) for PyroD20 and PyroD20@60 was found to be 37.2 % and 37.8 %, respectively, which was 6.0 % and 7.8 % higher than those of D. The brake-specific fuel consumption (BSFC) for PyroD20 and PyroD20@60 was reduced by up to 22.0 % and 22.7 %, respectively, compared to D. With the use of PyroD20@60, the emissions of carbon monoxide (CO), hydrocarbon (HC), and smoke were reduced by up to 27.0 %, 7.3 %, and 21.2 %, respectively. The produced renewable liquid oil may certainly be used in blends with conventional diesel for IC engine operation.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101905"},"PeriodicalIF":5.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cerium-induced modification of acid-base sites in Ni-zeolite catalysts for improved dry reforming of methane 铈诱导的镍沸石催化剂酸碱位点改性用于改进甲烷的干转化

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-14 DOI: 10.1016/j.joei.2024.101901

Abdulrahman bin Jumah , Marie-Nour Kaydouh , Ahmed S. Al-Fatesh , Mohammed O. Bayazed , Anis H. Fakeeha , Ahmed A. Ibrahim , Ahmed E. Abasaeed , Kirankumar J. Chaudhary , Nissrine El Hassan

Dry reforming of methane (DRM) is a promising route to mitigate greenhouse gas emissions by converting CH₄ and CO₂ into valuable syngas. The present work explores the effect of Ce addition to Ni-based catalysts supported on CBV3020E (ZSM-5) for DRM. The use of Ce as a promoter to tune the acid-base properties of zeolites for DRM is addressed for the first time in detail. While Ce has traditionally been used to improve oxygen storage capacity, this work explores its novel use as a means to enhance surface basicity and promote CO₂ adsorption. The samples were prepared by wet impregnation, characterized using N₂-sorption, X-ray diffraction, H₂-temperature-programmed reduction, temperature-programmed desorption of CO₂ and ammonia, and Fourier transforms infrared spectroscopy, and tested for DRM at 800 °C and 42,000 mL/g.h GHSV. Results show that ZSM-5 zeolite can be beneficial in achieving high metal dispersion. The introduction of 2 wt% Ce to Ni₅/ZSM-5 increases the concentration of strong basic sites, resulting in improved catalytic performance from 37 % CH₄ conversion and 48 % CO₂ conversion for Ni₅/ZSM-5 to 55 % and 65 % on promoted Ni₅Ce₂/ZSM-5, respectively. Thus, the best results are observed on Ni₅Ce₂/ZSM-5 and an optimal H₂/CO ratio of 0.84 is achieved in this case. Upon decreasing GHSV to 15,000 mL/g.h, CH₄ and CO₂ conversions jump to 83 % and 88 %, respectively on Ni₅Ce₂/ZSM-5. Cerium doping produces more desirable strong basic sites and enhances NiO reducibility. This promotes CO₂ adsorption and drives the catalytic reaction towards syngas formation, which eventually results in increased efficiency and improved performance.

甲烷干重整（DRM）是通过将 CH4 和 CO2 转化为有价值的合成气来减少温室气体排放的一条可行途径。本研究探讨了在以 CBV3020E（ZSM-5）为载体的镍基催化剂中添加 Ce 对 DRM 的影响。本研究首次详细探讨了如何使用 Ce 作为促进剂来调整用于 DRM 的沸石的酸碱特性。虽然 Ce 传统上一直被用于提高氧气储存能力，但这项研究探索了将其用作提高表面碱性和促进二氧化碳吸附的新方法。样品通过湿法浸渍制备，使用 N2 吸附、X 射线衍射、H2 温度编程还原、CO2 和氨的温度编程解吸以及傅立叶变换红外光谱进行表征，并在 800 °C 和 42,000 mL/g.h GHSV 条件下进行 DRM 测试。结果表明，ZSM-5 沸石有利于实现高金属分散。在 Ni5/ZSM-5 中引入 2 wt% 的 Ce 可提高强碱性位点的浓度，从而改善催化性能，使 Ni5/ZSM-5 的 CH4 转化率和 CO2 转化率分别从 37% 和 48% 提高到 55% 和 65%。因此，Ni5Ce2/ZSM-5 的效果最好，最佳 H2/CO 比率为 0.84。当 GHSV 降至 15,000 mL/g.h 时，Ni5Ce2/ZSM-5 上的 CH4 和 CO2 转化率分别跃升至 83 % 和 88 %。铈掺杂产生了更多理想的强碱性位点，提高了氧化镍的还原性。这促进了二氧化碳的吸附，并推动催化反应向合成气形成的方向发展，最终提高了效率和性能。

{"title":"Cerium-induced modification of acid-base sites in Ni-zeolite catalysts for improved dry reforming of methane","authors":"Abdulrahman bin Jumah , Marie-Nour Kaydouh , Ahmed S. Al-Fatesh , Mohammed O. Bayazed , Anis H. Fakeeha , Ahmed A. Ibrahim , Ahmed E. Abasaeed , Kirankumar J. Chaudhary , Nissrine El Hassan","doi":"10.1016/j.joei.2024.101901","DOIUrl":"10.1016/j.joei.2024.101901","url":null,"abstract":"<div><div>Dry reforming of methane (DRM) is a promising route to mitigate greenhouse gas emissions by converting CH<sub>4</sub> and CO<sub>2</sub> into valuable syngas. The present work explores the effect of Ce addition to Ni-based catalysts supported on CBV3020E (ZSM-5) for DRM. The use of Ce as a promoter to tune the acid-base properties of zeolites for DRM is addressed for the first time in detail. While Ce has traditionally been used to improve oxygen storage capacity, this work explores its novel use as a means to enhance surface basicity and promote CO<sub>2</sub> adsorption. The samples were prepared by wet impregnation, characterized using N<sub>2</sub>-sorption, X-ray diffraction, H<sub>2</sub>-temperature-programmed reduction, temperature-programmed desorption of CO<sub>2</sub> and ammonia, and Fourier transforms infrared spectroscopy, and tested for DRM at 800 °C and 42,000 mL/g.h GHSV. Results show that ZSM-5 zeolite can be beneficial in achieving high metal dispersion. The introduction of 2 wt% Ce to Ni<sub>5</sub>/ZSM-5 increases the concentration of strong basic sites, resulting in improved catalytic performance from 37 % CH<sub>4</sub> conversion and 48 % CO<sub>2</sub> conversion for Ni<sub>5</sub>/ZSM-5 to 55 % and 65 % on promoted Ni<sub>5</sub>Ce<sub>2</sub>/ZSM-5, respectively. Thus, the best results are observed on Ni<sub>5</sub>Ce<sub>2</sub>/ZSM-5 and an optimal H<sub>2</sub>/CO ratio of 0.84 is achieved in this case. Upon decreasing GHSV to 15,000 mL/g.h, CH<sub>4</sub> and CO<sub>2</sub> conversions jump to 83 % and 88 %, respectively on Ni<sub>5</sub>Ce<sub>2</sub>/ZSM-5. Cerium doping produces more desirable strong basic sites and enhances NiO reducibility. This promotes CO<sub>2</sub> adsorption and drives the catalytic reaction towards syngas formation, which eventually results in increased efficiency and improved performance.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101901"},"PeriodicalIF":5.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetics, response surface methodology, and regeneration studies of MOF-derived Ni-Ce catalyst for dry reforming of methane 用于甲烷干重整的 MOF 衍生 Ni-Ce 催化剂的动力学、响应面方法和再生研究

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-13 DOI: 10.1016/j.joei.2024.101898

Ruth D. Alli, Nima Ghafarvand, Mohammad H. Sedghkerdar, Nader Mahinpey

The MOF-derived bimetallic Ni-Ce catalyst was studied under three major headings: kinetics, stability and regeneration, and response surface methodology (RSM). The impact of reaction temperature and inlet gas flowrate on H₂/CO, CO₂ and CH₄ conversions in DRM were determined by using RSM and design of experiment (DOE). Optimal values, determined through RSM evaluation, revealed CO₂ and CH₄ conversions and H₂/CO ratio of 99 %, 96 %, and 0.98, respectively, achieved at a reaction temperature of 793 °C and an inlet flowrate of 0.03 mol/h. Furthermore, the kinetic assessment was evaluated using six kinetic models, with reversible Langmuir Hinshelwood and Power law models identified as the best fits. Also, the stability and 2-cycle regeneration analysis at 700 °C, 0.033 mol/h inlet gas flowrate, and a 1:1 CH₄:CO₂ ratio, showed the MOF-derived Ni-Ce catalyst stability and better regeneration was observed under CO₂ compared to air, as air regeneration caused a higher degree of sintering on the catalyst than CO₂ regeneration.

研究从 MOF 衍生的双金属 Ni-Ce 催化剂的三个主要方面：动力学、稳定性和再生以及响应面方法 (RSM)。利用 RSM 和实验设计 (DOE) 确定了反应温度和入口气体流速对 DRM 中 H2/CO、CO2 和 CH4 转化率的影响。通过 RSM 评估确定的最佳值显示，在反应温度为 793 °C 和入口流量为 0.03 mol/h 时，CO2 和 CH4 转化率以及 H2/CO 比率分别为 99 %、96 % 和 0.98。此外，还使用六种动力学模型对动力学进行了评估，结果表明可逆的朗缪尔-钦谢伍德模型和幂律模型最符合要求。此外，在 700 °C、0.033 mol/h 入口气体流速和 1:1 CH4:CO2 比率条件下进行的稳定性和 2 周期再生分析表明，MOF 衍生的 Ni-Ce 催化剂具有稳定性，与空气相比，在 CO₂ 条件下再生效果更好，因为与 CO₂ 再生相比，空气再生会导致催化剂烧结程度更高。

{"title":"Kinetics, response surface methodology, and regeneration studies of MOF-derived Ni-Ce catalyst for dry reforming of methane","authors":"Ruth D. Alli, Nima Ghafarvand, Mohammad H. Sedghkerdar, Nader Mahinpey","doi":"10.1016/j.joei.2024.101898","DOIUrl":"10.1016/j.joei.2024.101898","url":null,"abstract":"<div><div>The MOF-derived bimetallic Ni-Ce catalyst was studied under three major headings: kinetics, stability and regeneration, and response surface methodology (RSM). The impact of reaction temperature and inlet gas flowrate on H<sub>2</sub>/CO, CO<sub>2</sub> and CH<sub>4</sub> conversions in DRM were determined by using RSM and design of experiment (DOE). Optimal values, determined through RSM evaluation, revealed CO<sub>2</sub> and CH<sub>4</sub> conversions and H<sub>2</sub>/CO ratio of 99 %, 96 %, and 0.98, respectively, achieved at a reaction temperature of 793 °C and an inlet flowrate of 0.03 mol/h. Furthermore, the kinetic assessment was evaluated using six kinetic models, with reversible Langmuir Hinshelwood and Power law models identified as the best fits. Also, the stability and 2-cycle regeneration analysis at 700 °C, 0.033 mol/h inlet gas flowrate, and a 1:1 CH<sub>4</sub>:CO<sub>2</sub> ratio, showed the MOF-derived Ni-Ce catalyst stability and better regeneration was observed under CO₂ compared to air, as air regeneration caused a higher degree of sintering on the catalyst than CO₂ regeneration.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101898"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The impact of ignition and activation energy distribution on the combustion and emission characteristics of diesel-ammonia-natural gas engines 点火和活化能分布对柴油-氨-天然气发动机燃烧和排放特性的影响

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-13 DOI: 10.1016/j.joei.2024.101903

Qingyang Ma, Jiayong Wang, Shouying Jin, Minshuo Shi

To enhance the performance and reduce emissions of ammonia-diesel engines, natural gas is employed as a partial substitute for diesel fuel. This substitution accelerates the combustion rate of ammonia fuel, resulting in improved engine efficiency and decreased emissions. This study investigates how variations in ignition energy (diesel quantity) and activation energy (natural gas quantity) distribution ratios affect engine combustion and emission characteristics through simulation. The study established six groups of operating conditions, with ignition energy ranging from 24 mg to 4 mg. The findings indicate that substituting part of the ignition energy with activation energy enhances the combustion efficiency of ammonia, increases the engine's indicated thermal efficiency and reduces ammonia slip. The optimal operating condition identified in this study is D16/N8, yielding a thermal efficiency of 51.0 %. Compared to the case without natural gas addition, NOx emissions increased, while other pollutants showed significant reductions. In particular, N₂O emissions decreased by 97 %, greenhouse gas (GHG) emissions dropped by 57.2 %, ammonia slip was nearly eliminated, and unburned losses were minimal. The findings of this research offer valuable insights for further enhancing efficiency and reducing emissions in ammonia-diesel dual-fuel engines.

为了提高氨-柴油发动机的性能并减少排放，天然气被用作柴油燃料的部分替代品。这种替代可加快氨燃料的燃烧速度，从而提高发动机效率并减少排放。本研究通过模拟研究了点火能量（柴油量）和活化能（天然气量）分配比例的变化如何影响发动机的燃烧和排放特性。研究设定了六组工作条件，点火能量从 24 毫克到 4 毫克不等。研究结果表明，用活化能替代部分点火能可提高氨的燃烧效率，提高发动机的指示热效率并减少氨滑移。本研究确定的最佳运行条件为 D16/N8，热效率为 51.0%。与不添加天然气的情况相比，氮氧化物的排放量有所增加，而其他污染物则显著减少。其中，一氧化二氮的排放量减少了 97%，温室气体（GHG）的排放量减少了 57.2%，氨滑移几乎消除，未燃烧损失极小。这项研究成果为进一步提高氨-柴油双燃料发动机的效率和减少排放提供了宝贵的见解。

{"title":"The impact of ignition and activation energy distribution on the combustion and emission characteristics of diesel-ammonia-natural gas engines","authors":"Qingyang Ma, Jiayong Wang, Shouying Jin, Minshuo Shi","doi":"10.1016/j.joei.2024.101903","DOIUrl":"10.1016/j.joei.2024.101903","url":null,"abstract":"<div><div>To enhance the performance and reduce emissions of ammonia-diesel engines, natural gas is employed as a partial substitute for diesel fuel. This substitution accelerates the combustion rate of ammonia fuel, resulting in improved engine efficiency and decreased emissions. This study investigates how variations in ignition energy (diesel quantity) and activation energy (natural gas quantity) distribution ratios affect engine combustion and emission characteristics through simulation. The study established six groups of operating conditions, with ignition energy ranging from 24 mg to 4 mg. The findings indicate that substituting part of the ignition energy with activation energy enhances the combustion efficiency of ammonia, increases the engine's indicated thermal efficiency and reduces ammonia slip. The optimal operating condition identified in this study is D16/N8, yielding a thermal efficiency of 51.0 %. Compared to the case without natural gas addition, NOx emissions increased, while other pollutants showed significant reductions. In particular, N<sub>2</sub>O emissions decreased by 97 %, greenhouse gas (GHG) emissions dropped by 57.2 %, ammonia slip was nearly eliminated, and unburned losses were minimal. The findings of this research offer valuable insights for further enhancing efficiency and reducing emissions in ammonia-diesel dual-fuel engines.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101903"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Turbulent jet development of active pre-chamber fueled with zero-carbon fuel blends 使用零碳混合燃料的主动式前置腔的湍流喷射发展

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-08 DOI: 10.1016/j.joei.2024.101881

Xinpeng Guo , Tie Li , Run Chen , Ning Wang , Shuai Huang , Xinyi Zhou , Shiyan Li , Ping Yi

Active pre-chamber turbulent jet ignition has the potential to enhance the combustion of low-reactivity fuels. However, the related fundamental studies on the jet ignition mechanism are inadequate, especially for the independent effects of the zero-carbon fuel blends on the jet development characteristics, isolating the impact of the main chamber combustion. In this work, the effects of the fuel compositions ranged from the 30%H₂+70%NH₃ blend to pure H₂ and also comprised the pure CH₄ for comparison and the initial pressures in the pre-chamber are studied by the two-pass high-speed Schlieren method. The results show that the hot turbulent jet developments present great differences for the pre-chamber charged with various H₂+NH₃ blends across the hydrogen blend ratios varying from 30 % to 100 % in volumetric fraction. Moreover, the evolutions of the hot turbulent jet from the pre-chamber charged with the 50%H₂+50%NH₃ blend and pure CH₄ are similar. As the initial pressure increases, there is a gradual deceleration in the development of the pre-chamber jet, and the turbulent jet development characteristics depend on the pressure ratio rather than the pressure difference across the pre-chamber and main chamber. This study could provide important insights for the development of zero-carbon fuel engines.

主动式前室湍流喷射点火具有增强低反应燃料燃烧的潜力。然而，对射流点火机理的相关基础研究并不充分，尤其是对零碳燃料混合物对射流发展特性的独立影响研究不足，无法隔离主腔燃烧的影响。在这项工作中，采用双通道高速 Schlieren 方法研究了从 30%H2+70%NH3 混合燃料到纯 H2 的燃料成分的影响，还包括纯 CH4 的影响以进行比较，并研究了前腔的初始压力。结果表明，在充入各种 H2+NH3 混合物的预室中，热湍流射流的发展在氢气混合物的体积分数比例从 30% 到 100% 之间存在很大差异。此外，充入 50%H2+50%NH3 混合物和纯 CH4 的前置室的热湍流射流的演变过程相似。随着初始压力的增加，前室射流的发展速度逐渐减慢，湍流射流的发展特征取决于压力比，而不是前室和主室之间的压力差。这项研究可为零碳燃料发动机的开发提供重要启示。

{"title":"Turbulent jet development of active pre-chamber fueled with zero-carbon fuel blends","authors":"Xinpeng Guo , Tie Li , Run Chen , Ning Wang , Shuai Huang , Xinyi Zhou , Shiyan Li , Ping Yi","doi":"10.1016/j.joei.2024.101881","DOIUrl":"10.1016/j.joei.2024.101881","url":null,"abstract":"<div><div>Active pre-chamber turbulent jet ignition has the potential to enhance the combustion of low-reactivity fuels. However, the related fundamental studies on the jet ignition mechanism are inadequate, especially for the independent effects of the zero-carbon fuel blends on the jet development characteristics, isolating the impact of the main chamber combustion. In this work, the effects of the fuel compositions ranged from the 30%H<sub>2</sub>+70%NH<sub>3</sub> blend to pure H<sub>2</sub> and also comprised the pure CH<sub>4</sub> for comparison and the initial pressures in the pre-chamber are studied by the two-pass high-speed Schlieren method. The results show that the hot turbulent jet developments present great differences for the pre-chamber charged with various H<sub>2</sub>+NH<sub>3</sub> blends across the hydrogen blend ratios varying from 30 % to 100 % in volumetric fraction. Moreover, the evolutions of the hot turbulent jet from the pre-chamber charged with the 50%H<sub>2</sub>+50%NH<sub>3</sub> blend and pure CH<sub>4</sub> are similar. As the initial pressure increases, there is a gradual deceleration in the development of the pre-chamber jet, and the turbulent jet development characteristics depend on the pressure ratio rather than the pressure difference across the pre-chamber and main chamber. This study could provide important insights for the development of zero-carbon fuel engines.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101881"},"PeriodicalIF":5.6,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of the ash melting on heat and mass characteristics and reaction rate during corn stalk pellet gasification 灰熔化对玉米秸秆颗粒气化过程中的热量、质量特性和反应速率的影响

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-08 DOI: 10.1016/j.joei.2024.101883

Yao Xu , Kechun Wang , Yejian Qian , Wangsheng Yang , Zhiqiang Li , QingQing Li , Peiyong Ma

In order to investigate the effect of ash melting on the gasification process of biomass pellet, a high-temperature visual gasification system was set up, meanwhile, a biomass melting gasification model for a single pellet was built. Considering that the fusion temperature range of ash is from 1418 K to 1558 K, 1396 K (below 1418 K), 1491 K (between 1418 K and 1558 K), 1591 K and 1677 K (above 1558 K) were chosen as the experimental temperatures. Results show that ash melting could absorb heat, thereby resisting the heat transfer inside pellet. When the gasification temperature is higher than 1558 K, as the larger spherical particles caused by ash melting and coalescing peels off from the pellet surface, the pellet covered by melting ash could be directly exposed to the environment, which is conducive to the heat and mass transfer.

为了研究灰熔化对生物质颗粒气化过程的影响，建立了高温可视气化系统，同时建立了单一颗粒的生物质熔化气化模型。考虑到灰熔化温度范围为 1418 K 至 1558 K，实验温度分别选为 1396 K（1418 K 以下）、1491 K（1418 K 至 1558 K 之间）、1591 K 和 1677 K（1558 K 以上）。结果表明，灰熔化会吸收热量，从而阻碍颗粒内部的热量传递。当气化温度高于 1558 K 时，由于灰熔化和凝聚产生的较大球形颗粒从球团表面脱落，被熔化灰覆盖的球团可直接暴露在环境中，有利于传热和传质。

引用次数: 0

Thermodynamic performance comparison of calcium looping processes for post-combustion capture: Influence of CO2 enrichment routes among three heat supply methods 用于燃烧后捕集的钙循环工艺的热力学性能比较：三种供热方法中二氧化碳富集路线的影响

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-07 DOI: 10.1016/j.joei.2024.101878

Song He , Lifan Gao , Yawen Zheng , Junyao Wang , Dongtai Yang , Xuelan Zeng

Calcium looping process is recognized as a promising option for low-energy consumption post-combustion CO₂ capture. This paper introduced three calcium looping processes with different fossil-fuel-based heat supply methods including air combustion (CaL-AC), oxy-fuel combustion (CaL-Oxy), and chemical looping combustion (CaL-CLC). The sensitivities of key parameters on system performance are investigated, and the detailed energy analysis is conducted to reveal the thermodynamic performance difference. Results show that the changes of the average CaO conversion ratio and the solids make-up ratio bring about drastic variation of energy distributions and the specific primary energy consumption for CO₂ avoidance (SPECCA) in the CaL-AC process. While temperature difference of supplying heat for calcination has a significant influence on the system performance of the CaL-CLC process. Besides, eliminating air preheating leads to the increase of the SPECCA from 3.12 MJ/kg CO₂ to 4.53 MJ/kg CO₂ in the CaL-AC process, which is inferior than that in the CaL-Oxy process. Furthermore, the minimum CO₂ enrichment work of different pathways is examined. The unit minimum enrichment work in the CaL-CLC process is 9.92 kJ/mol CO₂, lower than those in the other two processes due to the avoidance of minimum enrichment work for fuel decarbonization. Through reaction coupling, the Gibbs free energy of the combustion reaction offsets the minimum work required for O₂ release, thereby avoiding the minimum separation work. In post-combustion CO₂ capture processes, avoiding the CO₂ enrichment work requirement during fossil fuel conversion will offer another way to reduce energy consumption.

钙循环工艺被认为是一种低能耗的燃烧后二氧化碳捕集技术。本文介绍了三种不同化石燃料供热方式的钙循环工艺，包括空气燃烧（CaL-AC）、富氧燃烧（CaL-Oxy）和化学循环燃烧（CaL-CLC）。研究了关键参数对系统性能的敏感性，并进行了详细的能量分析，以揭示热力学性能差异。结果表明，在 CaL-AC 过程中，平均 CaO 转化率和固体配比的变化会带来能量分布和避免二氧化碳排放的一次能源消耗量（SPECCA）的急剧变化。而煅烧供热温差对 CaL-CLC 工艺的系统性能有很大影响。此外，取消空气预热会导致 CaL-AC 工艺的 SPECCA 从 3.12 MJ/kg CO2 增加到 4.53 MJ/kg CO2，低于 CaL-Oxy 工艺。此外，还考察了不同途径的最小二氧化碳富集功。由于避免了燃料脱碳的最小富集功，CaL-CLC 工艺的单位最小富集功为 9.92 kJ/mol CO2，低于其他两种工艺。通过反应耦合，燃烧反应的吉布斯自由能抵消了释放 O2 所需的最小功，从而避免了最小分离功。在燃烧后二氧化碳捕获过程中，避免化石燃料转化过程中所需的二氧化碳富集功将提供另一种降低能耗的方法。

{"title":"Thermodynamic performance comparison of calcium looping processes for post-combustion capture: Influence of CO2 enrichment routes among three heat supply methods","authors":"Song He , Lifan Gao , Yawen Zheng , Junyao Wang , Dongtai Yang , Xuelan Zeng","doi":"10.1016/j.joei.2024.101878","DOIUrl":"10.1016/j.joei.2024.101878","url":null,"abstract":"<div><div>Calcium looping process is recognized as a promising option for low-energy consumption post-combustion CO<sub>2</sub> capture. This paper introduced three calcium looping processes with different fossil-fuel-based heat supply methods including air combustion (CaL-AC), oxy-fuel combustion (CaL-Oxy), and chemical looping combustion (CaL-CLC). The sensitivities of key parameters on system performance are investigated, and the detailed energy analysis is conducted to reveal the thermodynamic performance difference. Results show that the changes of the average CaO conversion ratio and the solids make-up ratio bring about drastic variation of energy distributions and the specific primary energy consumption for CO<sub>2</sub> avoidance (SPECCA) in the CaL-AC process. While temperature difference of supplying heat for calcination has a significant influence on the system performance of the CaL-CLC process. Besides, eliminating air preheating leads to the increase of the SPECCA from 3.12 MJ/kg CO<sub>2</sub> to 4.53 MJ/kg CO<sub>2</sub> in the CaL-AC process, which is inferior than that in the CaL-Oxy process. Furthermore, the minimum CO<sub>2</sub> enrichment work of different pathways is examined. The unit minimum enrichment work in the CaL-CLC process is 9.92 kJ/mol CO<sub>2</sub>, lower than those in the other two processes due to the avoidance of minimum enrichment work for fuel decarbonization. Through reaction coupling, the Gibbs free energy of the combustion reaction offsets the minimum work required for O<sub>2</sub> release, thereby avoiding the minimum separation work. In post-combustion CO<sub>2</sub> capture processes, avoiding the CO<sub>2</sub> enrichment work requirement during fossil fuel conversion will offer another way to reduce energy consumption.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101878"},"PeriodicalIF":5.6,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the pyrolysis process of simulated oily sludge: Kinetics, mechanism, product distribution, and S/N elements migration 探索模拟含油污泥的热解过程：动力学、机理、产物分布和信噪比迁移

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-06 DOI: 10.1016/j.joei.2024.101882

Hui Wang , Jinling Li , Geyu Wu , Fang Miao , Bo Yang , Shidong Zhu , Tao Yu

Pyrolysis is an important method for energy recovery and harmless treatment of oily sludge, definite reaction mechanism and the transformation of S and N elements is a key to improve the pyrolysis products. In this paper, a simulated oil sludge (SOS) was pyrolyzed at various temperatures of 400–700 °C in a tube furnace focusing on pyrolysis process, kinetic parameters, reaction mechanisms, S and N element migration patterns and product distributions. Kinetic parameters were deducted by FWO, KAS, Friedman and Starink methods, and the activation energy were 186.23–231.20 kJ/mol (Avg. 210.71 kJ/mol), 190.18–233.80 kJ/mol (Avg. 212.02 kJ/mol), 196.93–242.01 kJ/mol (Avg. 209.88 kJ/mol) and 184.82–230.95 kJ/mol (Avg. 218.67 kJ/mol), respectively, showed high similarity. All the pre-exponential factors were higher than 10⁹ s⁻¹, which indicated high reactivity of SOS during pyrolysis, and the pyrolysis process followed the nucleation growth model (A3). Pyrolysis temperatures had a significant influence on products distribution. The maximum yields of pyrolysis tar and gas were observed at 550 °C and 700 °C, respectively. Pyrolysis tar was dominated by aromatics and acids, while pyrolysis gas was mainly composed of H₂ and CH₄. Additionally, high temperatures could facilitate the transfer of more S and N into tar or gas products, and S and N compounds were mainly thiophene-S, sulfoxide-S, pyridine-N and pyrrole-N in char and CS₂, CH₃SH, COS, SO₂, H₂S, NH₃, HCN and NO_x in gas.

热解是能源回收和无害化处理含油污泥的重要方法，明确的反应机理和 S、N 元素的转化是改进热解产物的关键。本文在管式炉中对模拟油污泥（SOS）进行了400-700 ℃不同温度的热解，重点研究了热解过程、动力学参数、反应机理、S和N元素迁移规律及产物分布。通过 FWO、KAS、Friedman 和 Starink 方法推导出动力学参数，活化能分别为 186.23-231.20 kJ/mol（平均 210.71 kJ/mol）、190.18-233.80 kJ/mol（平均 210.71 kJ/mol）、190.18-233.80 kJ/mol（平均 210.71 kJ/mol）。80 kJ/mol（平均值为 212.02 kJ/mol）、196.93-242.01 kJ/mol（平均值为 209.88 kJ/mol）和 184.82-230.95 kJ/mol（平均值为 218.67 kJ/mol），显示出高度的相似性。所有前指数都高于 109 s-1，这表明 SOS 在热解过程中具有很高的反应活性，热解过程遵循成核生长模型（A3）。热解温度对产物分布有显著影响。热解焦油和气体的最大产率分别出现在 550 °C 和 700 °C 时。热解焦油主要是芳烃和酸，而热解气体主要由 H2 和 CH4 组成。此外，高温可促进更多的 S 和 N 转移到焦油或气体产物中，焦炭中的 S 和 N 化合物主要是噻吩-S、亚砜-S、吡啶-N 和吡咯-N，气体中的 S 和 N 化合物主要是 CS2、CH3SH、COS、SO2、H2S、NH3、HCN 和 NOx。

{"title":"Exploring the pyrolysis process of simulated oily sludge: Kinetics, mechanism, product distribution, and S/N elements migration","authors":"Hui Wang , Jinling Li , Geyu Wu , Fang Miao , Bo Yang , Shidong Zhu , Tao Yu","doi":"10.1016/j.joei.2024.101882","DOIUrl":"10.1016/j.joei.2024.101882","url":null,"abstract":"<div><div>Pyrolysis is an important method for energy recovery and harmless treatment of oily sludge, definite reaction mechanism and the transformation of S and N elements is a key to improve the pyrolysis products. In this paper, a simulated oil sludge (SOS) was pyrolyzed at various temperatures of 400–700 °C in a tube furnace focusing on pyrolysis process, kinetic parameters, reaction mechanisms, S and N element migration patterns and product distributions. Kinetic parameters were deducted by FWO, KAS, Friedman and Starink methods, and the activation energy were 186.23–231.20 kJ/mol (Avg. 210.71 kJ/mol), 190.18–233.80 kJ/mol (Avg. 212.02 kJ/mol), 196.93–242.01 kJ/mol (Avg. 209.88 kJ/mol) and 184.82–230.95 kJ/mol (Avg. 218.67 kJ/mol), respectively, showed high similarity. All the pre-exponential factors were higher than 10<sup>9</sup> s<sup>−1</sup>, which indicated high reactivity of SOS during pyrolysis, and the pyrolysis process followed the nucleation growth model (A3). Pyrolysis temperatures had a significant influence on products distribution. The maximum yields of pyrolysis tar and gas were observed at 550 °C and 700 °C, respectively. Pyrolysis tar was dominated by aromatics and acids, while pyrolysis gas was mainly composed of H<sub>2</sub> and CH<sub>4</sub>. Additionally, high temperatures could facilitate the transfer of more S and N into tar or gas products, and S and N compounds were mainly thiophene-S, sulfoxide-S, pyridine-N and pyrrole-N in char and CS<sub>2</sub>, CH<sub>3</sub>SH, COS, SO<sub>2</sub>, H<sub>2</sub>S, NH<sub>3</sub>, HCN and NO<sub>x</sub> in gas.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101882"},"PeriodicalIF":5.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the effects of aging on the pyrolysis of plastic and the synergistic mechanisms of co-pyrolysis with lignite 研究老化对塑料热解的影响以及与褐煤共同热解的协同机制

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute

Pub Date : 2024-11-06 DOI: 10.1016/j.joei.2024.101886

Yang-Yang Xu , Hai-Xu Zou , Yuan Gao , Zheng-Hong Li , Wen-Han Wei , Xing Fan , Xiang Bai , Yierxiati Dilixiati , Guligena Pidamaimaiti , Xian-Yong Wei

Co-pyrolysis of waste plastic with low-rank coal explored how photoaging impacts the pyrolysis of plastics and delves into the synergistic mechanisms involved in co-pyrolysis. The results of elemental analysis, X-ray powder diffraction and Fourier transform infrared spectroscopy showed that photoaging primarily involves oxidizing and breaking the aliphatic chains in polyethylene (PE), as well as generating oxygen-containing functional groups like hydroxyl (-OH), carbonyl (-C=O), and ether (-C-O), thereby reducing the crystallinity of PE. The results of individual plastic pyrolysis showed that photoaging is beneficial to the generation of gas and tar. Pyrolysis tar of PE samples contains significant amounts of alcohols, and olefins and alkynes (O&As). The results of co-pyrolysis indicated that photoaging can enhance the yields of gas and oil from the co-pyrolysis between PE and Naomaohu (NMH) coal. Co-pyrolysis effectively reduced the relative content of O&As in the tar from the pyrolysis of PE samples alone by 8.0%–29.0 %. The synergistic mechanism of co-pyrolysis between aged PE and NMH involved supplying a significant quantity of hydrogen and hydroxyl radicals by NMH, which react with alkyl radicals generated from PE pyrolysis, leading to the production of additional alkanes and alcohols. These findings offered new insights for a deeper understanding of the co-pyrolysis behaviors between waste plastic and lignite.

废塑料与低阶煤的共热解探索了光老化如何影响塑料的热解，并深入研究了共热解过程中的协同机制。元素分析、X 射线粉末衍射和傅立叶变换红外光谱分析结果表明，光老化主要涉及氧化和断裂聚乙烯（PE）中的脂肪族链，以及生成羟基（-OH）、羰基（-C=O）和醚基（-C-O）等含氧官能团，从而降低聚乙烯的结晶度。单个塑料热解的结果表明，光老化有利于气体和焦油的生成。聚乙烯样品的热解焦油含有大量的醇、烯烃和炔烃（O&As）。共热解的结果表明，在聚乙烯和直茂湖（NMH）煤的共热解过程中，光老化可以提高气体和油的产量。共热解有效地降低了单独热解 PE 样品焦油中 O&As 的相对含量，降幅为 8.0%-29.0 %。老化聚乙烯和 NMH 协同热解的协同机制包括 NMH 提供大量的氢和羟基自由基，这些自由基与聚乙烯热解产生的烷基自由基发生反应，从而产生更多的烷烃和醇。这些发现为深入了解废塑料与褐煤的协同热解行为提供了新的视角。

{"title":"Study on the effects of aging on the pyrolysis of plastic and the synergistic mechanisms of co-pyrolysis with lignite","authors":"Yang-Yang Xu , Hai-Xu Zou , Yuan Gao , Zheng-Hong Li , Wen-Han Wei , Xing Fan , Xiang Bai , Yierxiati Dilixiati , Guligena Pidamaimaiti , Xian-Yong Wei","doi":"10.1016/j.joei.2024.101886","DOIUrl":"10.1016/j.joei.2024.101886","url":null,"abstract":"<div><div>Co-pyrolysis of waste plastic with low-rank coal explored how photoaging impacts the pyrolysis of plastics and delves into the synergistic mechanisms involved in co-pyrolysis. The results of elemental analysis, X-ray powder diffraction and Fourier transform infrared spectroscopy showed that photoaging primarily involves oxidizing and breaking the aliphatic chains in polyethylene (PE), as well as generating oxygen-containing functional groups like hydroxyl (-OH), carbonyl (-C=O), and ether (-C-O), thereby reducing the crystallinity of PE. The results of individual plastic pyrolysis showed that photoaging is beneficial to the generation of gas and tar. Pyrolysis tar of PE samples contains significant amounts of alcohols, and olefins and alkynes (O&As). The results of co-pyrolysis indicated that photoaging can enhance the yields of gas and oil from the co-pyrolysis between PE and Naomaohu (NMH) coal. Co-pyrolysis effectively reduced the relative content of O&As in the tar from the pyrolysis of PE samples alone by 8.0%–29.0 %. The synergistic mechanism of co-pyrolysis between aged PE and NMH involved supplying a significant quantity of hydrogen and hydroxyl radicals by NMH, which react with alkyl radicals generated from PE pyrolysis, leading to the production of additional alkanes and alcohols. These findings offered new insights for a deeper understanding of the co-pyrolysis behaviors between waste plastic and lignite.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101886"},"PeriodicalIF":5.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0