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Experimental study on yield and quality of tar from tar-rich coal under the simulated in-situ conditions 模拟原位条件下富焦油煤产焦油率和焦油质量的实验研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101912
Xing Ning, Xiaole Huang, Xiangyu Xue, Chang'an Wang, Lei Deng, Defu Che
Tar-rich coal has a great potential to extract a large body of liquid fuels through thermal treatment. To investigate the effects of in-situ conditions on both the yield and the quality of the tar from tar-rich coal during pyrolysis, an experimental system in which the in-situ conditions can be simulated was built. The simulated conditions included in-situ stress, pyrolysis temperature, heating rate, and moisture content. Furthermore, the underlying mechanisms of in-situ conditions on the tar from tar-rich coal were revealed. The tar yield is increased from 0.83 % to 10.13 % in the temperature range of 200–500 °C, but a considerable drop of the yield occurs around 600 °C due to the cracking of the tar. The heating rate is decreased from 16 °C/min to 2 °C/min, the tar yield is increased from 4.63 % to 10.30 %. At low heating rates, the tar yield can be boosted during the in-situ pyrolysis, in contrast to the high heating rate required in conventional coal pyrolysis. Based on the variations in the average activation energy of pyrolysis kinetic under in-situ conditions, the in-situ pyrolysis can easily form the active free radicals in tar-rich coal but difficultly promote the reactions in the formed active free radicals. The decomposition of the bridge bonds in aromatic, the –CH2/–CH3 in aliphatic, the oxygen-containing functional group, and the hydrogen-bonded-OH group for tar-rich coal under in-situ conditions is conducive to producing the high-value tar. The low ratio of chain hydrocarbons to aromatic hydrocarbons and the decreased relative content of oxygenated compounds in the tar under in-situ conditions improve the tar quality. Compared with the tar from tar-rich coal under the conventional pyrolysis, the tar under the in-situ pyrolysis is rich in light oil. This study provides the better understanding of the effects of in-situ conditions on tar from tar-rich coal, and also guides the in-situ pyrolysis of coal to extract high-value tar in applications.
富焦油煤具有通过热处理提取大量液体燃料的巨大潜力。为了研究原位条件对富焦油煤热解过程中焦油产率和质量的影响,建立了模拟原位条件的实验系统。模拟条件包括地应力、热解温度、升温速率和含水率。此外,还揭示了富焦油煤生成焦油的原位条件的潜在机理。在200 ~ 500℃的温度范围内,焦油收率由0.83%提高到10.13%,但在600℃左右,由于焦油的开裂,收率会出现相当大的下降。升温速率由16℃/min降低到2℃/min,焦油收率由4.63%提高到10.30%。在低加热速率下,与传统煤热解需要高加热速率相比,原位热解可以提高焦油收率。根据原位条件下热解动力学平均活化能的变化可知,原位热解容易在富焦油煤中形成活性自由基,但难以促进形成的活性自由基中的反应。富焦油煤的芳烃桥键、脂肪族-CH2 / -CH3、含氧官能团、氢键羟基在原位条件下的分解有利于高值焦油的生成。在原位条件下,焦油中链烃与芳香烃的比例较低,含氧化合物的相对含量降低,改善了焦油的质量。与常规热解富焦油煤的焦油相比,原位热解的焦油中含有丰富的轻质油。本研究有助于更好地了解原位条件对富焦油煤中焦油的影响,对煤的原位热解提取高值焦油具有指导意义。
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引用次数: 0
Co-pyrolysis and co-combustion characteristics of low-rank coal and waste biomass: Insights into interactions, kinetics and synergistic effects 低阶煤和废生物质共热解和共燃烧特性:相互作用、动力学和协同效应的见解
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101918
Zhenkun Guo , Mengyuan Liu , Haocheng He , Feiran Song , Xiaofeng Chen , Fanhui Guo , Juan Chen , Shijian Lu , Shuxun Sang , Jianjun Wu
This study delves into the investigation of the co-pyrolysis, co-combustion characteristics, and kinetic behaviors of straw and low-rank coal, aiming to inform strategies for their optimal combustion as potential solid fuels. As the biomass proportion increases, the synergistic effect during co-pyrolysis gradually diminishes. The addition of straw char into coal char notably enhances the ignitability and combustibility of coal char. In the co-combustion process, both synergistic and antagonistic effects (Interaction index varies from −13.52 kJ⋅mol−1 to 12.62 kJ⋅mol−1) exist between carbonized straw and coal char, while the synergistic effect was dominant. The first-order chemical reaction (O1) and diffusion-controlled reaction (D3 and D4) are the most effective mechanisms (all the correlation coefficient R2 > 0.97) for the co-combustion process. The proportion of straw char in the blend is recommended to be maintained at 20 wt% because of the lowest total combustion activation energy (92.35 kJ⋅mol−1) and the most pronounced synergistic effect (Interaction index ΔX = 13.6). These findings offer valuable theoretical guidance for promoting the sustainable utilization of low-rank coal and biomass waste resources, fostering a more eco-friendly and efficient energy landscape.
本研究对秸秆和低阶煤的共热解、共燃烧特性及动力学行为进行了深入研究,旨在为秸秆和低阶煤作为潜在固体燃料的最佳燃烧策略提供依据。随着生物质比例的增加,共热解过程中的协同效应逐渐减弱。在煤焦中加入秸秆炭,可显著提高煤焦的可燃性和可燃性。在共燃烧过程中,秸秆与煤焦之间既有协同效应,也有拮抗效应(相互作用指数在−13.52 kJ⋅mol−1 ~ 12.62 kJ⋅mol−1之间),但以协同效应为主。一级化学反应(O1)和扩散控制反应(D3和D4)是最有效的机理(所有相关系数R2 >;0.97)为共燃过程。秸秆炭的总燃烧活化能最低(92.35 kJ·mol−1),协同效应最显著(相互作用指数ΔX = 13.6),因此建议秸秆炭在共混物中的比例保持在20 wt%。这些研究结果为促进低阶煤和生物质废弃物资源的可持续利用,形成更加生态友好和高效的能源格局提供了有价值的理论指导。
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引用次数: 0
Investigation on the mechanism of ash deposition formation from mineral components and characteristics of ash deposition on boiler heating surface during co-firing of coal and biomass 煤与生物质共烧过程中矿物组分结灰机理及锅炉受热面结灰特征研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101921
Yongzheng Wang, Bo Liang, Yanjie Liang, Wenjie Fan, Jisen Liu, Shengli Niu, Kuihua Han
The power generation by co-firing of coal and biomass is the most economical and promising technology for existing coal-fired power plants to achieve reducing emission of CO2 and large-scale efficient utilization of biomass. The mechanism of ash deposition formation from mineral components and the characteristics of ash deposition on boiler heating surface during co-firing of coal and biomass were investigated in this paper. A water-cooled probe was used to simulate the heating surface of high-temperature super-heater in the furnace, and the experiments on ash deposition were carried out in a one-dimensional settling furnace. The micro-morphology, element composition and phase composition of the deposited ash on the surface of the water-cooled probe under different conditions were characterized by means of SEM, EDS, XRD and other methods. The results show that the migration and transformation pathways of alkali metal K and Cl elements in the mineral components can significantly affect the behavior of ash deposition formation. The meltbility of ash particles and the viscosity of deposit sediment are two important factors determining the degree of ash deposition. With the blending ratio of biomass in coal increasing, the content of K2O and Cl in the deposited ash increases rapidly, conversely, the content of SiO2 and Al2O3 in the deposited ash shows rapidly decreasing trend. Meanwhile, based on the micro-morphology features, the particles of the deposited ash gradually become smaller, the structure of the deposited ash becomes denser, and the agglomeration and melting phenomenon in the deposited ash is more obvious. The alkali metal K and Cl in the biomass and S, Si, Al and other components in the coal will have a synergistic effect during co-firing of coal and biomass. There are significant effects of fuel property, the blending ratio of biomass in coal and the temperature in furnace on the characteristics of ash deposition. With the continuous addition of biomass in coal, and the rising temperatures, it will produce KAl2(AlSi3O10)(OH)2, K(AlSi3O8), Ca(A12Si2O8), Mg3Al2(SiO4)3 and other substances with low melting point as well as CaSO4 considered as the binder between ash particles. The overall melting point of the deposited ash is reduced, the viscosity is enhanced, and the degree of the ash deposition is aggravated.
煤与生物质共烧发电是现有燃煤电厂实现二氧化碳减排和生物质大规模高效利用的最经济、最具发展前景的技术。研究了煤与生物质共烧过程中矿物组分结灰机理及锅炉受热面结灰特征。采用水冷探头模拟炉内高温过热器受热面,并在一维沉降炉中进行了灰沉降实验。采用SEM、EDS、XRD等方法对不同条件下水冷探针表面沉积灰的微观形貌、元素组成和物相组成进行了表征。结果表明,矿物组分中碱金属K、Cl元素的迁移转化路径对灰分沉积形成行为有显著影响。灰分颗粒的熔融性和沉积物的粘度是决定灰分沉积程度的两个重要因素。随着煤中生物质掺比的增加,沉积灰分中K2O和Cl含量迅速增加,相反,沉积灰分中SiO2和Al2O3含量呈快速下降趋势。同时,从微观形貌特征来看,沉积灰分颗粒逐渐变小,沉积灰分结构更加致密,沉积灰分中的结块和熔融现象更加明显。生物质中的碱金属K、Cl与煤中的S、Si、Al等组分在煤与生物质共烧过程中会产生协同作用。燃料性质、生物质与煤的掺合比例和炉膛温度对灰沉降特性有显著影响。随着煤中生物质的不断加入和温度的升高,会产生KAl2(AlSi3O10)(OH)2、K(AlSi3O8)、Ca(A12Si2O8)、Mg3Al2(SiO4)3等低熔点物质,以及CaSO4作为灰粒之间的粘结剂。沉积灰的整体熔点降低,粘度增强,灰分沉积程度加重。
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引用次数: 0
Study on the comprehensive influence of Si-Al-based additives on hydrogen production and K deposition during biomass gasification 硅铝基添加剂对生物质气化产氢和钾沉积的综合影响研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101915
Zenghui Hou , Zefeng Ge , Lijuan Sun , Yang Liu , Huiyan Zhang
Green hydrogen production through gasification is a prospective utilization of biomass. Operational issues (slagging, corrosion and catalyst poisoning) due to inherent alkali metal deposition are main factors affecting gasification. The adoption of Si-Al-based additives as alkali metal inhibitors is a promising approach. In this work, the influence of additive types and placement methods on K deposition and gasification characteristics were studied through a decoupled gasification with online analysis. As a result, separative placement (Sep) method could reduce K deposition without decreasing hydrogen yield compared to mechanical mixture (Mix) method. This advantage is particularly prominent in char gasification. SiO2 is recommended to be added by the Mix to react with alkali and alkaline earth metal species individually to inhibit K release. This match could reduce peak of K deposition content by 55.80 % with less impact on hydrogen yield. Meanwhile, Al2O3 is recommended to be added by the Sep due to its unique comprehensive performance, which could increase hydrogen yield by 4.34 % and reduce peak of K deposition content by 52.72 %. Two recommended addition strategies could be used in different scenarios. This study is expected to guide the design of corrosion-resistant reactors and multifunctional catalysts.
绿色气化制氢是生物质的一种有前景的利用方式。由于固有碱金属沉积引起的操作问题(结渣、腐蚀和催化剂中毒)是影响气化的主要因素。采用硅铝基添加剂作为碱金属抑制剂是一种很有前途的方法。通过解耦在线气化分析,研究了添加剂类型和放置方式对K沉积和气化特性的影响。结果表明,与机械混合(Mix)方法相比,分离放置(Sep)方法可以在不降低氢产率的情况下减少K沉积。这一优势在炭气化中尤为突出。建议在混合料中加入SiO2,分别与碱土金属和碱土金属发生反应,抑制K的释放。该配型可使K沉积峰含量降低55.80%,对产氢率的影响较小。同时,由于Al2O3具有独特的综合性能,Sep推荐添加Al2O3,可使产氢率提高4.34%,使K沉积峰含量降低52.72%。在不同的场景中可以使用两种推荐的加法策略。该研究对耐腐蚀反应器和多功能催化剂的设计具有指导意义。
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引用次数: 0
Plasma-catalytic assisted ammonia synthesis: Reactive molecular dynamics study 等离子体催化辅助氨合成:反应性分子动力学研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101919
Xingyu Lu , Qi Chen , Nan Liu , Jie Chen , Mingming Zhang , Jintao Sun
Plasma catalytic assisted ammonia synthesis is currently considered a promising approach that enables ammonia synthesis under low temperature and low pressure. In this paper, ReaxFF molecular dynamics (MD) method was first used to study the impact of varying electric fields and different plasma-generated active species on ammonia synthesis, aiming to uncover the formation mechanisms and synthetic pathways of NH3 from the molecular-level under plasma assistance. The results indicate that the electric field has the optimal range. With the increase of electric field strength, the collision frequency between N2 and H2 molecules does not increase linearly due to the polarization phenomenon, but increases first and then decreases, which affects the production of ammonia. As the electric field is greater than −0.01 V/Å, the ammonia production begins to decline due to the decreased molecular collision frequency as well as the electric-field induced ammonia dissociation. The results also show that the plasma-generated active species significantly promote NH3 formation. Compared to the plasma-generated excited state and the ion, plasma-generated radicals such as N, H, NH and NH2 have a more significant promoting effect on ammonia synthesis due to the acceleration of ammonia synthesis elementary reactions and the reduction of starting time significantly. In the aspect of molecular level, a new ammonia synthesis reaction pathway is discovered: N2→N2H→N2H2→N2H3→NH3, which was never reported in previous studies. In addition, by decoupling the gas-phase reactions and dissociative adsorption reactions on the catalyst, it verified a new adsorption reaction path: N(s)→NH(s)→N2H(s)→N2H2(s) at molecular level. This study provides valuable insights into the complete dynamic mechanism of plasma catalyst assisted NH3 synthesis in the molecular level.
等离子体催化辅助氨合成目前被认为是一种很有前途的方法,可以在低温低压下合成氨。本文首次采用ReaxFF分子动力学(MD)方法研究了不同电场和不同等离子体产生的活性物质对氨合成的影响,旨在从分子水平揭示等离子体辅助下NH3的形成机制和合成途径。结果表明,电场具有最佳范围。随着电场强度的增加,N2和H2分子之间的碰撞频率由于极化现象而不是线性增加,而是先增加后降低,影响氨的产生。当电场大于−0.01 V/Å时,由于分子碰撞频率的降低以及电场引起的氨解离,氨的产量开始下降。结果还表明,等离子体生成的活性物质显著促进NH3的形成。与等离子体产生的激发态和离子相比,等离子体产生的N、H、NH、NH2等自由基对氨合成的促进作用更为显著,这是由于氨合成基本反应的加速和起始时间的显著缩短。在分子水平上,发现了一种新的氨合成反应途径:N2→N2H→N2H2→N2H3→NH3,这是以往研究中从未报道过的。此外,通过将催化剂上的气相反应和解离吸附反应解耦,在分子水平上验证了新的吸附反应路径:N(s)→NH(s)→N2H(s)→N2H2(s)。本研究在分子水平上对等离子体催化剂辅助NH3合成的完整动力学机制提供了有价值的见解。
{"title":"Plasma-catalytic assisted ammonia synthesis: Reactive molecular dynamics study","authors":"Xingyu Lu ,&nbsp;Qi Chen ,&nbsp;Nan Liu ,&nbsp;Jie Chen ,&nbsp;Mingming Zhang ,&nbsp;Jintao Sun","doi":"10.1016/j.joei.2024.101919","DOIUrl":"10.1016/j.joei.2024.101919","url":null,"abstract":"<div><div>Plasma catalytic assisted ammonia synthesis is currently considered a promising approach that enables ammonia synthesis under low temperature and low pressure. In this paper, ReaxFF molecular dynamics (MD) method was first used to study the impact of varying electric fields and different plasma-generated active species on ammonia synthesis, aiming to uncover the formation mechanisms and synthetic pathways of NH<sub>3</sub> from the molecular-level under plasma assistance. The results indicate that the electric field has the optimal range. With the increase of electric field strength, the collision frequency between N<sub>2</sub> and H<sub>2</sub> molecules does not increase linearly due to the polarization phenomenon, but increases first and then decreases, which affects the production of ammonia. As the electric field is greater than −0.01 V/Å, the ammonia production begins to decline due to the decreased molecular collision frequency as well as the electric-field induced ammonia dissociation. The results also show that the plasma-generated active species significantly promote NH<sub>3</sub> formation. Compared to the plasma-generated excited state and the ion, plasma-generated radicals such as N, H, NH and NH<sub>2</sub> have a more significant promoting effect on ammonia synthesis due to the acceleration of ammonia synthesis elementary reactions and the reduction of starting time significantly. In the aspect of molecular level, a new ammonia synthesis reaction pathway is discovered: N<sub>2</sub>→N<sub>2</sub>H→N<sub>2</sub>H<sub>2</sub>→N<sub>2</sub>H<sub>3</sub>→NH<sub>3</sub>, which was never reported in previous studies. In addition, by decoupling the gas-phase reactions and dissociative adsorption reactions on the catalyst, it verified a new adsorption reaction path: N(s)→NH(s)→N<sub>2</sub>H(s)→N<sub>2</sub>H<sub>2</sub>(s) at molecular level. This study provides valuable insights into the complete dynamic mechanism of plasma catalyst assisted NH<sub>3</sub> synthesis in the molecular level.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101919"},"PeriodicalIF":5.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759379","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 synergistic role of sludge conditioner FeCl3/Rice husk on co-combustion with coal gangue: Thermaldynamic behavior, gases pollutants control and bottom ash stabilization 污泥调节剂FeCl3/稻壳对煤矸石共燃的协同作用:热力学行为、气体污染物控制和底灰稳定
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101920
Jixin Li , Hanlin Zhang , Yiyang He , Xin Wang , Xiao Cao , Haiyan Yang , Lu Chen , Suyun Xu , Haifeng Wen , Lin Gu
Coal processing invariably generates substantial quantities of low calorific value waste, specifically coal gangue (CG), which can be advantageously utilized by combusting to yield valuable electrical energy. However, CG incur poor ignition and flame instability, and consequently is not suited to separate combustion. The co-combustion with sewage sludge (SS) has demonstrated positive impacts on energy recovery, whereas the SS dewatering may significantly influence the co-combustion behavior. Therefore, this study systematically investigated the impact of two typical sludge conditioner, namely FeCl3·6H2O and rice husk (RH), which functions as flocculant and skeletal builder, on their synergistic role on co-combustion with CG. The thermal dynamic combustion behavior, pollutant emissions, slag tendency and bottom ash stability and toxicity were systematically studied. A robust positive synergism is observed, attributed to heat compensation and the formation of alkali metal aluminosilicates from Rh during the ignition phase. Concurrently, the temperature dependent iron oxides evolution enhances the acceleration of O2 loop, thereby promoting the char combustion. After being jointly conditioned with Rh and FeCl3, the co-combustion with CG resulted in CCi being 3.46 times higher than that of C1S3, and the average activation energy in each stage was reduced by 49.1 %. Significantly, the sludge conditioner also contributes to the reduced exhausted gases such as CO2, SO2 and NO. The Rh in SS has been found to mitigate slagging and fouling tendencies, while the retention of Cr, Cu, Ni, and Pb is greatly improved due to the stabilization of silicate minerals in CG. The Artificial Neural Network (ANN) models were established to predict the thermogravimetric experimental data of CG-SS-Rh/Fe, which aims to provide a basis for the selection of optimal operating conditions in real industrial applications.
煤炭加工总是会产生大量的低热值废物,特别是煤矸石(CG),可以通过燃烧来有利地利用,产生有价值的电能。然而,CG引起较差的点火和火焰不稳定性,因此不适合分离燃烧。与污泥共燃对能量回收有积极影响,而污泥脱水对共燃行为有显著影响。因此,本研究系统研究了两种典型的污泥调理剂FeCl3·6H2O和稻壳(RH)作为絮凝剂和骨架构建剂,对其与CG共燃协同作用的影响。系统地研究了热动力燃烧行为、污染物排放、渣倾向、底灰稳定性和毒性。一个强大的正协同作用被观察到,归因于热补偿和形成碱金属铝硅酸盐从Rh在点火阶段。同时,温度依赖性铁氧化物的析出增强了O2环的加速,从而促进了炭的燃烧。经Rh和FeCl3共同调节后,与CG共燃烧的CCi比C1S3高3.46倍,各阶段平均活化能降低49.1%。值得注意的是,污泥调理剂还有助于减少排放气体,如CO2, SO2和NO。SS中的Rh可以减轻结渣和结垢的倾向,而由于CG中的硅酸盐矿物的稳定,Cr, Cu, Ni和Pb的保留率大大提高。建立人工神经网络(ANN)模型,对CG-SS-Rh/Fe的热重实验数据进行预测,为实际工业应用中最佳操作条件的选择提供依据。
{"title":"The synergistic role of sludge conditioner FeCl3/Rice husk on co-combustion with coal gangue: Thermaldynamic behavior, gases pollutants control and bottom ash stabilization","authors":"Jixin Li ,&nbsp;Hanlin Zhang ,&nbsp;Yiyang He ,&nbsp;Xin Wang ,&nbsp;Xiao Cao ,&nbsp;Haiyan Yang ,&nbsp;Lu Chen ,&nbsp;Suyun Xu ,&nbsp;Haifeng Wen ,&nbsp;Lin Gu","doi":"10.1016/j.joei.2024.101920","DOIUrl":"10.1016/j.joei.2024.101920","url":null,"abstract":"<div><div>Coal processing invariably generates substantial quantities of low calorific value waste, specifically coal gangue (CG), which can be advantageously utilized by combusting to yield valuable electrical energy. However, CG incur poor ignition and flame instability, and consequently is not suited to separate combustion. The co-combustion with sewage sludge (SS) has demonstrated positive impacts on energy recovery, whereas the SS dewatering may significantly influence the co-combustion behavior. Therefore, this study systematically investigated the impact of two typical sludge conditioner, namely FeCl<sub>3</sub>·6H<sub>2</sub>O and rice husk (RH), which functions as flocculant and skeletal builder, on their synergistic role on co-combustion with CG. The thermal dynamic combustion behavior, pollutant emissions, slag tendency and bottom ash stability and toxicity were systematically studied. A robust positive synergism is observed, attributed to heat compensation and the formation of alkali metal aluminosilicates from Rh during the ignition phase. Concurrently, the temperature dependent iron oxides evolution enhances the acceleration of O<sub>2</sub> loop, thereby promoting the char combustion. After being jointly conditioned with Rh and FeCl<sub>3</sub>, the co-combustion with CG resulted in CCi being 3.46 times higher than that of C1S3, and the average activation energy in each stage was reduced by 49.1 %. Significantly, the sludge conditioner also contributes to the reduced exhausted gases such as CO<sub>2</sub>, SO<sub>2</sub> and NO. The Rh in SS has been found to mitigate slagging and fouling tendencies, while the retention of Cr, Cu, Ni, and Pb is greatly improved due to the stabilization of silicate minerals in CG. The Artificial Neural Network (ANN) models were established to predict the thermogravimetric experimental data of CG-SS-Rh/Fe, which aims to provide a basis for the selection of optimal operating conditions in real industrial applications.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101920"},"PeriodicalIF":5.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756927","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
Investigation on co-gasification performances of sewage sludge and polyolefins by thermogravimetric analyze and two-stage fixed bed reactor 采用热重分析法和两段式固定床反应器研究污水污泥与聚烯烃共气化性能
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101922
Yu Yang, Daiyang Long, Pingping Tang, Yican Jiang, Huiyan Duan
Co-gasification of biomass with hydrogen-rich feedstock is a promising method to improve H2 yield. Thus, in this work, co-gasification performances and corresponding promotion/inhibition effects of sewage sludge (SS) and three types of polyolefins (PE, PP and PS) were investigated in the thermogravimetric analyze and two-stage fixed bed reactor. Thermogravimetric experiments results indicated that with the addition of polyolefins, the initial temperature of blends progressively elevated, while its terminal temperature declined, suggesting that adding polyolefins facilitated the decomposition of samples. The thermal degradation of blends was distinguished into two stages, and in the first stage, a negative interaction was found at 25 % polyolefins mass ratio, but a positive interaction was occurred at 50 % and 75 % polyolefins mass ratios. Meanwhile, in the second stage, a negative interaction was obtained for blending with PE, whereas an opposite result was observed for blending with PP or PS. Therefore, temperature, feedstock and mixing ratio interacted on synergy effects between SS and polyolefins. Besides, two-stage fixed bed experiments results suggested that a higher gasification temperature was beneficial for the production of syngas, particularly the H2 yield, and blending with polyolefins into SS enhanced the H2 content, with PE performing best. The synergy interactions between SS and polyolefins accelerated the concentrations of H2 and CH4, while declining the CnHm yield, demonstrating a stronger re-cleavage of macromolecules. Furthermore, the low heat value of syngas and carbon conversion efficiency for all the samples separately elevated and reduced with rising gasification temperature and polyolefins mass ratios. At 800 °C, the highest gasification efficiency of samples could be achieved with the addition of 50 % PP or PS. This study provides a basis for the application of SS and polyolefins co-gasification.
生物质与富氢原料共气化是一种很有前途的提高H2产率的方法。因此,本研究在两段式固定床反应器上研究了污水污泥(SS)与三种聚烯烃(PE、PP和PS)的共气化性能及其促进/抑制作用。热重实验结果表明,随着聚烯烃的加入,共混物的初始温度逐渐升高,最终温度逐渐下降,表明聚烯烃的加入促进了样品的分解。共混物的热降解分为两个阶段,在第一阶段,聚烯烃质量比为25%时出现负相互作用,而在聚烯烃质量比为50%和75%时出现正相互作用。与此同时,在第二阶段,与PE共混得到负相互作用,而与PP或PS共混得到相反的结果。因此,温度、原料和混合比例对SS与聚烯烃的协同效应有交互作用。此外,两段固定床实验结果表明,较高的气化温度有利于合成气的生产,特别是H2的产率,与聚烯烃共混可提高合成气的H2含量,其中PE表现最好。SS和聚烯烃之间的协同作用加速了H2和CH4的浓度,同时降低了CnHm的产率,表现出更强的大分子重劈作用。此外,随着气化温度和聚烯烃质量比的升高,所有样品的合成气低热值和碳转化效率分别升高和降低。在800℃下,添加50% PP或PS的样品气化效率最高。本研究为SS与聚烯烃共气化的应用提供了依据。
{"title":"Investigation on co-gasification performances of sewage sludge and polyolefins by thermogravimetric analyze and two-stage fixed bed reactor","authors":"Yu Yang,&nbsp;Daiyang Long,&nbsp;Pingping Tang,&nbsp;Yican Jiang,&nbsp;Huiyan Duan","doi":"10.1016/j.joei.2024.101922","DOIUrl":"10.1016/j.joei.2024.101922","url":null,"abstract":"<div><div>Co-gasification of biomass with hydrogen-rich feedstock is a promising method to improve H<sub>2</sub> yield. Thus, in this work, co-gasification performances and corresponding promotion/inhibition effects of sewage sludge (SS) and three types of polyolefins (PE, PP and PS) were investigated in the thermogravimetric analyze and two-stage fixed bed reactor. Thermogravimetric experiments results indicated that with the addition of polyolefins, the initial temperature of blends progressively elevated, while its terminal temperature declined, suggesting that adding polyolefins facilitated the decomposition of samples. The thermal degradation of blends was distinguished into two stages, and in the first stage, a negative interaction was found at 25 % polyolefins mass ratio, but a positive interaction was occurred at 50 % and 75 % polyolefins mass ratios. Meanwhile, in the second stage, a negative interaction was obtained for blending with PE, whereas an opposite result was observed for blending with PP or PS. Therefore, temperature, feedstock and mixing ratio interacted on synergy effects between SS and polyolefins. Besides, two-stage fixed bed experiments results suggested that a higher gasification temperature was beneficial for the production of syngas, particularly the H<sub>2</sub> yield, and blending with polyolefins into SS enhanced the H<sub>2</sub> content, with PE performing best. The synergy interactions between SS and polyolefins accelerated the concentrations of H<sub>2</sub> and CH<sub>4</sub>, while declining the C<sub>n</sub>H<sub>m</sub> yield, demonstrating a stronger re-cleavage of macromolecules. Furthermore, the low heat value of syngas and carbon conversion efficiency for all the samples separately elevated and reduced with rising gasification temperature and polyolefins mass ratios. At 800 °C, the highest gasification efficiency of samples could be achieved with the addition of 50 % PP or PS. This study provides a basis for the application of SS and polyolefins co-gasification.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101922"},"PeriodicalIF":5.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756925","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
Experimental and theoretical investigation of Ce/Ti-doped LaMnO3 catalysts effect on catalytic oxidation rarefied CH4 for natural gas engine Ce/ ti掺杂LaMnO3催化剂对天然气发动机催化氧化稀薄CH4影响的实验与理论研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-28 DOI: 10.1016/j.joei.2024.101917
Junheng Liu, Huabin Zhang, Yongxu Wang, Shengyue Xiong, Qian Ji, Chengcheng Ao, Ping Sun
To mitigate the high greenhouse effect caused by methane emissions of natural gas engines, this study employed the citric acid complexation method to synthesize Ce/Ti-doped LaMnO3 perovskite catalysts. Firstly, the properties of perovskite catalysts were investigated through several characterization techniques and activity evaluations. Secondly, density functional theory (DFT) calculations were performed to study the effects of Ce/Ti doping on perovskite unit cell properties and methane adsorption characteristics. Results indicate that Ce/Ti doping is conducive to enhancing the magnetic properties and attractive forces between particles, thereby improving the crystallinity and specific surface area of catalyst. Additionally, it enhances the oxygen migration rate, promotes the formation of low-temperature reduction active components and reduces the reduction temperature for the catalysts. When Ce/Ti are co-doped, the ratios of the surface-active elements Mn4+/Mn3+ and O/O2− on the catalyst reach their maximum values of 1.56 and 1.53, respectively. The co-doping also leads to the formation of alkaline sites such as Mn-O and Ti-O metal pairs, which facilitate the dehydrogenation oxidation of methane. Ce/Ti-co-doped LaMnO3 perovskite exhibits the optimal low-temperature oxidation activity towards methane, with an ignition temperature reduced to 269 °C and complete methane conversion at 479 °C. Ce/Ti doping enhances the adsorption behavior of methane on catalyst surface, with the adsorption energy of −5.4361eV. Meanwhile, Ce/Ti doping results in a significant transfer of electrons from H1 atoms of methane to Mn atoms and increases the charge directivity of the surface-active atoms of catalysts, and in turn, it leads to higher catalytic performance and structural stability.
为了减轻天然气发动机甲烷排放造成的高温室效应,本研究采用柠檬酸络合法合成Ce/ ti掺杂LaMnO3钙钛矿催化剂。首先,通过多种表征技术和活性评价研究了钙钛矿催化剂的性能。其次,通过密度泛函理论(DFT)计算研究Ce/Ti掺杂对钙钛矿单体电池性能和甲烷吸附特性的影响。结果表明,Ce/Ti的掺杂有利于增强催化剂的磁性能和粒子间的吸引力,从而提高催化剂的结晶度和比表面积。提高氧迁移速率,促进低温还原活性组分的形成,降低催化剂的还原温度。Ce/Ti共掺杂时,催化剂表面活性元素Mn4+/Mn3+和O−/O2−的比值达到最大值,分别为1.56和1.53。共掺杂还导致了碱性位点的形成,如Mn-O和Ti-O金属对,有利于甲烷的脱氢氧化。Ce/ ti共掺杂LaMnO3钙钛矿对甲烷表现出最佳的低温氧化活性,其着火温度降至269℃,甲烷在479℃时完全转化。Ce/Ti掺杂增强了甲烷在催化剂表面的吸附行为,吸附能达到- 5.4361eV。同时,Ce/Ti掺杂使甲烷H1原子的电子向Mn原子转移,增加了催化剂表面活性原子的电荷指向性,从而提高了催化剂的催化性能和结构稳定性。
{"title":"Experimental and theoretical investigation of Ce/Ti-doped LaMnO3 catalysts effect on catalytic oxidation rarefied CH4 for natural gas engine","authors":"Junheng Liu,&nbsp;Huabin Zhang,&nbsp;Yongxu Wang,&nbsp;Shengyue Xiong,&nbsp;Qian Ji,&nbsp;Chengcheng Ao,&nbsp;Ping Sun","doi":"10.1016/j.joei.2024.101917","DOIUrl":"10.1016/j.joei.2024.101917","url":null,"abstract":"<div><div>To mitigate the high greenhouse effect caused by methane emissions of natural gas engines, this study employed the citric acid complexation method to synthesize Ce/Ti-doped LaMnO<sub>3</sub> perovskite catalysts. Firstly, the properties of perovskite catalysts were investigated through several characterization techniques and activity evaluations. Secondly, density functional theory (DFT) calculations were performed to study the effects of Ce/Ti doping on perovskite unit cell properties and methane adsorption characteristics. Results indicate that Ce/Ti doping is conducive to enhancing the magnetic properties and attractive forces between particles, thereby improving the crystallinity and specific surface area of catalyst. Additionally, it enhances the oxygen migration rate, promotes the formation of low-temperature reduction active components and reduces the reduction temperature for the catalysts. When Ce/Ti are co-doped, the ratios of the surface-active elements Mn<sup>4+</sup>/Mn<sup>3+</sup> and O<sup>−</sup>/O<sup>2−</sup> on the catalyst reach their maximum values of 1.56 and 1.53, respectively. The co-doping also leads to the formation of alkaline sites such as Mn-O and Ti-O metal pairs, which facilitate the dehydrogenation oxidation of methane. Ce/Ti-co-doped LaMnO<sub>3</sub> perovskite exhibits the optimal low-temperature oxidation activity towards methane, with an ignition temperature reduced to 269 °C and complete methane conversion at 479 °C. Ce/Ti doping enhances the adsorption behavior of methane on catalyst surface, with the adsorption energy of −5.4361eV. Meanwhile, Ce/Ti doping results in a significant transfer of electrons from H<sub>1</sub> atoms of methane to Mn atoms and increases the charge directivity of the surface-active atoms of catalysts, and in turn, it leads to higher catalytic performance and structural stability.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":"118 ","pages":"Article 101917"},"PeriodicalIF":5.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756926","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 effects of iron with alkali and alkaline earth metals on catalytic pyrolysis of biomass for highly graphitized carbon 铁与碱及碱土金属对生物质高石墨化碳催化热解的协同效应
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-26 DOI: 10.1016/j.joei.2024.101904
Sunwen Xia , Yong Wang , Chen Zhang , Shengli Niu , Bing Li , Dong Wang , Haiping Yang
To prepare highly graphitized carbon from biomass and understand the synergistic effects of iron with alkali and alkaline earth metals (AAEMs), K and Ca were introduced to iron-catalyzed graphitization of biomass. Results showed that both K and Ca accelerated the thermal decomposition rate of biomass, and the activation energy of the devolatilization stage with K and Ca reduced to 60.882 kJ/mol and 45.342 kJ/mol respectively, compared to 73.657 kJ/mol without K/Ca. The porous graphitic carbon obtained at 850 °C with the existence of K and Fe exhibited the highest graphitization degree parameter (g = 0.5193) with a big surface area (170.504 m2/g). The carbon with Ca and Fe showed a developed mesoporous structure (198.979 m2/g) and high graphitization parameter (g = 0.1783), compared to g = 0.0934 without K and Ca. Finally, the tailor-catalyzed mechanism of iron-catalyzed graphitization of biomass in the presence of K/Ca was proposed. K reduced the sp3 amorphous carbon structures and intercalated carbon framework while Ca produced the in-situ CaO template and extra gasification gas of CO2, resulting in an acceleration of the graphitization of biomass.
为了从生物质中制备高石墨化碳,并了解铁与碱和碱土金属(AAEMs)的协同效应,将K和Ca引入铁催化生物质石墨化。结果表明:K和Ca均加速了生物质的热分解速率,且有K和Ca的热解阶段活化能分别为60.882 kJ/mol和45.342 kJ/mol,而无K/Ca的热解阶段活化能为73.657 kJ/mol;在850℃条件下制备的多孔石墨炭石墨化度参数最高(g = 0.5193),比表面积大(170.504 m2/g)。与不含K和Ca的碳相比,含Ca和Fe的碳表现出发达的介孔结构(198.979 m2/g)和高的石墨化参数(g = 0.1783)。最后,提出了K/Ca存在下铁催化生物质石墨化的定制催化机理。K还原了sp3无定形碳结构和插层碳框架,Ca生成了原位CaO模板和额外的CO2气化气体,加速了生物质石墨化。
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引用次数: 0
Bio-oil production and catalytic upgrade to value added product: A review on recent technologies 生物油生产及催化转化为高附加值产品的最新技术综述
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-11-25 DOI: 10.1016/j.joei.2024.101880
Vinay Kumar , Neha Sharma , Ali Samy Abdelaal , Pritha Chakraborty , Jithin Thomas , Lucky Duhan , Ritu Pasrija , Shivani Dogra , Iyyappan Jayaraj
The urgent need of an alternative to fossil fuel has increased the attention towards renewable sources of fuel significantly. Organic matter which are produced through photosynthesis are termed as biomass. Lignocellulosic biomass can be greatly exploited as source of renewable energy, chemicals and materials. Thermochemical conversion like pyrolysis or gasification of lignocellulose biomass produce biogas or bio-oil which needs to be upgraded to transportation fuel. But several undesirable qualities like high viscosity, instability, low energy density, polymerization and corrosion are associated with bio-oil produced from lignocellulosic biomass due to their high oxygen content. Several techniques are available to upgrade the bio-oil which omits the undesirable qualities. The direct relationship between different characteristics of lignocellulosic biomass and quality of bio-oil along with different technologies for bio-oil production are discussed in this review. This review also emphasizes on several upgradation techniques along with the catalysts. The technoeconomic analysis discusses the economic potential of bio-oil and concentrate on the cost-effectivity. Finally, the challenges and future research directions are further analysed in this review.
化石燃料替代品的迫切需要大大增加了对可再生燃料来源的注意。通过光合作用产生的有机物被称为生物量。木质纤维素生物质可作为可再生能源、化学品和材料的重要来源。木质纤维素生物质的热解或气化等热化学转化产生的沼气或生物油需要升级为运输燃料。但是,由于高氧含量,木质纤维素生物质生产的生物油具有高粘度、不稳定性、低能量密度、聚合和腐蚀等不良特性。有几种技术可用于升级生物油,以消除不良品质。本文综述了木质纤维素生物质的不同特性与生物油质量的直接关系以及不同的生物油生产技术。本文还重点介绍了几种催化升级技术。技术经济分析讨论了生物油的经济潜力,并着重分析了其成本效益。最后,本文进一步分析了面临的挑战和未来的研究方向。
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引用次数: 0
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Journal of The Energy Institute
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