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Experimental study of NO emission in coal-methanol co-combustion under air-staged condition 空气阶段条件下煤与甲醇共燃中 NO 排放的实验研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101835
Jun Chen , Xin Wang , Weidong Fan , Tingjiang Liu , Yong Wang , Wei Geng

Application of renewable methanol as an alternative fuel is a promising method for both CO2 and NO emission reduction in thermal power plants fueled by coal. This work gives the first insight into coal-methanol co-combustion from the perspective of NO emission control with a wide range of methanol blending ratio (0%–100 %) involved. Air-staged strategy commonly applied in thermal power plants fueled by coal was considered, and the effects of some key parameters, including burnout air ratio, burnout air injection position and furnace temperature, were analyzed. Experimental results show a significant potential of NO emission reduction in coal-methanol co-combustion, as NO emission from methanol combustion is less than 30 % of that from coal combustion. The correlation between NO emission and methanol blending ratio is approximately linear. Air-staged strategy is still effective for NO emission reduction in coal-methanol co-combustion, and the effects of the key parameter is similar to that in coal combustion. Increase of burnout air ratio and delay of burnout air injection are beneficial, and NO emission can be reduced by more than 70 % compared with that under unstaged condition. Furnace temperature rise is harmful, whereas the corresponding NO emission increase is lower than 30 ppm (@6 % O2).

应用可再生甲醇作为替代燃料是以煤为燃料的火力发电厂减少二氧化碳和氮氧化物排放的一种可行方法。这项研究首次从氮氧化物排放控制的角度深入探讨了煤与甲醇的协同燃烧问题,其中涉及的甲醇掺混比例范围很广(0%-100%)。研究考虑了以煤为燃料的火力发电厂通常采用的空气分级策略,并分析了一些关键参数的影响,包括燃尽空气比、燃尽空气喷射位置和炉温。实验结果表明,煤-甲醇共燃具有显著的氮氧化物减排潜力,甲醇燃烧产生的氮氧化物排放量小于煤燃烧产生的氮氧化物排放量的 30%。NO 排放量与甲醇掺混率之间近似呈线性关系。在煤-甲醇联合燃烧中,空气分级策略对减少 NO 排放仍然有效,关键参数的影响与煤燃烧相似。增加燃尽空气比和延迟燃尽空气喷入是有益的,与未分阶段条件相比,氮氧化物排放量可减少 70% 以上。炉温升高是有害的,但相应的 NO 排放量增加低于 30 ppm(@6 % O2)。
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引用次数: 0
Comparison between the structural characteristics and process activity of bulk and mesoporous Ni-Co-Ce/Al2O3 catalysts in the dry reforming of methane 比较块状和介孔 Ni-Co-Ce/Al2O3 催化剂在甲烷干法转化中的结构特征和工艺活性
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101823
Sara Zolghadri, Maryam Meshksar, Soheila Zandi Lak, Mohammad Reza Rahimpour
Dry reforming of methane (DRM) is a potential way to exploit greenhouse gases and generate hydrogen. Catalyst deactivation is the biggest DRM commercialization obstacle. Lately, Ni-Co bimetallic catalysts have demonstrated improved carbon resistance over Ni-based catalysts. The aim of this research is not just to investigate the impact of Ni-Co catalysts on the DRM activity, but also to evaluate the Ni-Co alloy creation effect on the catalyst characteristics and activity. Mesoporous alumina (MA) was used as a catalyst support for Ni-Co particles in this process and its structure and activity were compared to those of bulk alumina (BA) supported catalysts. In addition, cerium was included into all of the catalysts developed as a suitable promoter for reducing the amount of deposited coke. The results obtained from the XRD and nitrogen adsorption/desorption analysis indicated the formation of a mesoporous structure and nanocrystalline morphology in the Ni-Co/MA samples, as compared to the Ni-Co/BA ones. The results showed that the bimetallic 2Ni-1Co-1Ce/MA sample had the best catalytic activity, with a CH4 conversion of 98.30 %, CO2 conversion of 96.35 %, and H2 yield of 96.30 % at 700 °C.
甲烷干重整(DRM)是一种利用温室气体并产生氢气的潜在方法。催化剂失活是 DRM 商业化的最大障碍。最近,Ni-Co 双金属催化剂比 Ni 基催化剂具有更好的抗碳性。本研究的目的不仅在于研究镍钴催化剂对 DRM 活性的影响,还在于评估镍钴合金的生成对催化剂特性和活性的影响。在此过程中,介孔氧化铝(MA)被用作 Ni-Co 颗粒的催化剂载体,其结构和活性与块状氧化铝(BA)载体催化剂的结构和活性进行了比较。此外,所有开发的催化剂中都加入了铈,作为减少沉积焦炭量的合适促进剂。XRD 和氮吸附/解吸分析结果表明,与 Ni-Co/BA 样品相比,Ni-Co/MA 样品形成了介孔结构和纳米晶形态。结果表明,双金属 2Ni-1Co-1Ce/MA 样品的催化活性最好,700 ℃ 时的 CH4 转化率为 98.30%,CO2 转化率为 96.35%,H2 产率为 96.30%。
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引用次数: 0
The effect of air distribution on the characteristics of waste combustion and NO generation in a grate incinerator 空气分布对炉排焚烧炉中垃圾燃烧特性和氮氧化物生成的影响
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101827
Jun Liu , Zheng Xie , Bingyu Guo , Yingzhe Xu , Qiuhong Wang , Xinwei Guo , Li Bai , Jisheng Long
The combustion process optimization and nitrogen oxide emissions reduction of waste incineration power generation is a key challenge. In order to reveal the influence of air distribution on the combustion process and NO emission in a grate-type waste incinerator, the combustion process and NOx generation in a waste incinerator were studied, and the influence of different ratios of primary air in the grate chamber, different ratios of primary air and secondary air, and different speeds and angles of secondary air on the combustion and NOx emission characteristics were explored. The results show that the moisture evaporation and mass loss rates of combusted MSW (municipal solid waste) increase accordingly as the air ratios of the primary air in the zone1 increases. As the ratio of air flow in the combustion section (zone 2) in the grate chamber increases, the high temperature area and oxygen concentration above the grate will increase, and the NO formation will be promoted accordingly. The NO concentration at the furnace outlet is reduced from 259.34 mg/Nm3 to 201.34 mg/Nm3, as the air flow ratio of the grate chamber in the combustion section (zone 2) is reduced from 0.50 to 0.34. With the increase of secondary airflow ratio, the high temperature zone in the furnace increases, and more NO is generated above the grate, however, the NO concentration at the furnace outlet decreased, the probable reason is the combined result of temperature and turbulent kinetic energy. The secondary air speed has a great influence on NO generation. With the increase of secondary air speed of SA3 and SA4, the concentration of NO at the furnace outlet decreases. The secondary air angle has little effect on NO generation, but has great effect on temperature distribution uniformity.
垃圾焚烧发电的燃烧过程优化和氮氧化物减排是一项关键挑战。为了揭示空气分布对炉排式垃圾焚烧炉燃烧过程和氮氧化物排放的影响,研究了垃圾焚烧炉的燃烧过程和氮氧化物产生情况,探讨了炉排炉膛内一次风不同配比、一次风与二次风不同配比、二次风不同速度和角度对燃烧和氮氧化物排放特性的影响。结果表明,随着1区一次风比例的增加,燃烧后的MSW(城市固体废物)水分蒸发率和质量损失率也相应增加。随着炉排室燃烧段(2 区)空气流量比的增加,炉排上方的高温区和氧气浓度也会增加,相应地也会促进 NO 的形成。当燃烧段(2 区)炉排室的空气流速比从 0.50 降低到 0.34 时,炉膛出口处的 NO 浓度从 259.34 mg/Nm3 降低到 201.34 mg/Nm3。随着二次风流比的增大,炉内高温区增大,炉排上方产生更多的 NO,但炉出口处的 NO 浓度却降低了,这可能是温度和湍流动能共同作用的结果。二次风速对 NO 的生成有很大影响。随着 SA3 和 SA4 二次风速的增加,炉口的 NO 浓度降低。二次风角度对 NO 生成的影响不大,但对温度分布的均匀性有很大影响。
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引用次数: 0
Oxygen vacancy modulation for enhanced hydrogen production via chemical looping water-gas shift 通过化学循环水气变换调节氧空位以提高制氢能力
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101830
Yufen Zhou , Feiyong Yang , Junhua Ren , Chonglai Chen , Haihua He , Wei Huang

Chemical looping water gas shift (CL-WGS)is prospective to generate high-purity hydrogen with integrated CO2 capture. However, this technology is impeded by the lack of active oxygen carriers at mid-temperatures. Here, we synthesized several Ni-doped CoFe2O4-δ to modulate oxygen vacancies and investigate its effect on promoting hydrogen production reaction via chemical looping water gas shift at 650 °C. The findings delineate that doping Ni considerably lowers the energy barriers associated with the oxygen vacancies formation, thereby augmenting their concentration. The underlying mechanism elucidates that within the CL-WGS process, the transfer of lattice oxygen acts as the rate-limiting step. NixCo1-xFe2O4 lowers the formation energy of oxygen vacancies and facilitates the bulk lattice oxygen diffusion through the bulk. Hence, Ni0.5Co0.5Fe2O4 demonstrates the most reduction depth and reversibility via redox reactions, resulting in an elevated hydrogen yield (∼15.5 mmol g−1) at 650 °C, which surpasses the yield from undoped CoFe2O4 by 1.4 times. This performance remains consistently high with only a minimal decline over 100 cycles. The findings introduce a promising approach to promote the reactivity of oxygen carriers, particularly for mid-temperature applications.

化学循环水气变换(CL-WGS)有望生成高纯度氢气,并集成二氧化碳捕集功能。然而,由于在中温条件下缺乏活性氧载体,这项技术受到了阻碍。在此,我们合成了几种掺杂镍的 CoFe2O4-δ 来调节氧空位,并研究了其对促进 650 °C 化学循环水气变换制氢反应的影响。研究结果表明,掺杂镍大大降低了与氧空位形成相关的能垒,从而提高了氧空位的浓度。其基本机制阐明了在 CL-WGS 过程中,晶格氧的转移是限速步骤。NixCo1-xFe2O4 降低了氧空位的形成能,并促进了晶格氧在晶格中的扩散。因此,Ni0.5Co0.5Fe2O4 通过氧化还原反应表现出最大的还原深度和可逆性,从而在 650 °C 时产生较高的氢(15.5 mmol g-1),是未掺杂 CoFe2O4 产率的 1.4 倍。这种性能一直保持较高水平,在 100 个循环中仅有极小的下降。这些发现为提高氧载体的反应活性,尤其是中温应用提供了一种前景广阔的方法。
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引用次数: 0
ReaxFF simulations on the transformation pathway of nitrogen elements in the heavy tar under oxy-coal combustion 富氧燃烧下重焦油中氮元素转化途径的 ReaxFF 模拟
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101837
Chunjing Liu , Jianyi Lu , Fei Zheng , Wenqing Ma , Jiayi An , Yuxin Wu

Heavy tar is a crucial intermediate product during coal combustion. To explore the transformation pathway of N atoms in heavy tar under oxy-coal combustion, a comprehensive molecular model of heavy tar with typical N-containing functional groups was constructed. Different temperatures and chemical equivalence ratios were set for the oxy-coal combustion. The ReaxFF was employed to study various products' distribution and molecular numbers. The reaction network among different precursors and NOx was extracted, and the NO to N2 conversion mechanism was summarized. The results indicated that, like char combustion, the proportion of heavy tar gradually declined, the proportion of light tar and organic gas first rose and then gradually declined, and the proportion of inorganic gas continuously rose during heavy tar combustion. As the temperature increased, the proportion of cyanide precursors decreased, while the proportion of amine precursors and NOx increased. The oxidation of N-containing intermediates became more intense as the O2 content rose, but this oxidation effect was inhibited, and the NOx generation was reduced as the O2 content further increased. NO could bond with NHi, HNO, CN, and activate NO, decomposing to produce N2O, and N2O reacted with H radical to produce N2.

重焦油是煤炭燃烧过程中的重要中间产物。为了探索煤炭富氧燃烧时重焦油中 N 原子的转化途径,我们构建了一个具有典型含 N 官能团的重焦油综合分子模型。设定了富氧燃烧的不同温度和化学当量比。利用 ReaxFF 研究了各种产物的分布和分子数。提取了不同前驱物与 NOx 之间的反应网络,并总结了 NO 到 N2 的转化机理。结果表明,与焦炭燃烧一样,在重焦油燃烧过程中,重焦油的比例逐渐下降,轻焦油和有机气体的比例先上升后逐渐下降,无机气体的比例持续上升。随着温度的升高,氰化物前驱体的比例下降,而胺前驱体和氮氧化物的比例上升。随着 O2 含量的增加,含 N 中间体的氧化作用更加强烈,但随着 O2 含量的进一步增加,这种氧化作用受到抑制,NOx 的生成量减少。NO 可以与 NHi、HNO、CN 和活化 NO 结合,分解生成 N2O,N2O 与 H 自由基反应生成 N2。
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引用次数: 0
Catalytic hydrodeoxygenation of lignin enhanced by selectively etching ZSM-5 通过选择性蚀刻 ZSM-5 强化木质素的催化加氢脱氧反应
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101838
Long-Yu Zhang , Li Li , Min Li , Zhong-Qiu Liu , Xian-Yong Wei , Hui Ma , Xing-Shun Cong

Cyclanes, a major component of aviation fuel, can be obtained from the catalytic hydrodeoxygenation (HDO) of lignin, which not only reduces the dependence on fossil resources, but also makes lignin refining economically viable. The adsorption capacity and dwell times of reactants and H2 on the catalyst play a key role in the HDO of lignin. It remains a difficult challenge to enhance the adsorption capacity of the catalyst for reactants and H2 and to prolong their extended dwell times on the catalyst. Based on this, a nickel-based catalyst with moderate corrosion was prepared by the dissolution of ZSM-5 single crystals induced by ammonia, and was used for value-added conversion of lignin. It was confirmed by experiments and complementary characterizations that the corrosion of Ni/ZSM-5 for etching 2 h (Ni/ZSM-52) enhanced the adsorption capacity of H2 and extended the dwell times of the reactant and H2. Furthermore, the uniformly dispersed Ni nanoparticles stimulated the intrinsic catalytic activity and efficiently generated HH and H+, which synergistically promote the HDO of lignin with the cyclanes yield up to 58.6 %. As a result, BOB was completely converted to cyclanes over Ni/ZSM-52 at 140 °C under 2 MPa of H2 for 4 h, suggesting Ni/ZSM-52 exhibits excellent HDO activity under mild conditions.

环烷是航空燃料的主要成分,可通过催化木质素加氢脱氧(HDO)获得,这不仅减少了对化石资源的依赖,而且使木质素提炼变得经济可行。反应物和 H2 在催化剂上的吸附能力和停留时间对木质素的 HDO 起着关键作用。如何提高催化剂对反应物和 H2 的吸附能力并延长它们在催化剂上的停留时间,仍然是一项艰巨的挑战。在此基础上,通过氨水诱导 ZSM-5 单晶的溶解,制备了具有适度腐蚀性的镍基催化剂,并将其用于木质素的增值转化。实验和补充表征证实,Ni/ZSM-5 腐蚀 2 小时(Ni/ZSM-52)可提高 H2 的吸附能力,延长反应物和 H2 的停留时间。此外,均匀分散的镍纳米颗粒激发了其内在催化活性,有效地生成了 H...H 和 H+,它们协同促进了木质素的 HDO,环烷烃的产率高达 58.6%。因此,在 140 °C、2 兆帕 H2 的条件下,Ni/ZSM-52 可将 BOB 完全转化为环烷,并持续 4 小时,这表明 Ni/ZSM-52 在温和条件下具有优异的 HDO 活性。
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引用次数: 0
Effect of ozone and oxygen dilution on soot formation in coflow ethylene/oxygen/ozone laminar partially premixed flames 臭氧和氧气稀释对同流乙烯/氧气/臭氧层流部分预混合火焰中烟尘形成的影响
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101832
Run Hong, Yuhang Yang, Jinfang Yao, Hui Zhou, Wenlong Dong, Huaqiang Chu
Ozone is a prospective additive for enhancing and controlling combustion, due to its extremely oxidizing property. Ozone can enhance laminar burning velocity, broaden the flammability limit and improve flame stability, but the effect of ozone on soot formation in the combustion process of hydrocarbon fuels was not yet clear. Therefore, the soot from ethylene/oxygen/ozone laminar partially premixed flames was investigated. Besides, the response law of soot formation to different dilution gas ratios, and the effect of ozone participation in the reaction was also investigated. This work found that ozone significantly shortened the flame height by 4 mm in the cases of 10 % dilution ratio. The particle size of soot was larger at low and medium flame heights due to ozone involved in combustion. The main reason was that ozone promoteed soot growth. At medium and high flame heights, the larger the percentage of oxygen and ozone, the lower graphitization degree of the soot. The addition of oxygen and ozone both made the ID/IG value increase, which indicated the graphitization degree decreased. The soot from high height of the flame with 10 % dilution ratio and the addition of ozone had the largest ID/IG value of 0.970, which indicated a very low degree of graphitization. The signal intensity of the oxygen-containing functional groups on the surface of soot at the high flame height was enhanced with the addition of oxygen and ozone to the reaction.
臭氧具有极强的氧化性,是一种可用于增强和控制燃烧的添加剂。臭氧可以提高层流燃烧速度,扩大燃烧极限,改善火焰稳定性,但臭氧对碳氢化合物燃料燃烧过程中烟尘形成的影响尚不明确。因此,研究了乙烯/氧气/臭氧层状部分预混合火焰产生的烟尘。此外,还研究了烟尘形成对不同稀释气体比例的响应规律,以及臭氧参与反应的影响。研究发现,在稀释比为 10% 的情况下,臭氧能明显缩短火焰高度 4 毫米。由于臭氧参与燃烧,烟尘的粒径在中低火焰高度时更大。主要原因是臭氧促进了烟尘的生长。在中高火焰高度下,氧气和臭氧的比例越大,烟尘的石墨化程度越低。氧气和臭氧的加入都使 ID/IG 值增加,表明石墨化程度降低。稀释比为 10%、添加了臭氧的火焰高度烟尘的 ID/IG 值最大,为 0.970,表明其石墨化程度很低。加入氧气和臭氧后,高火焰高度烟尘表面含氧官能团的信号强度增强。
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引用次数: 0
Effect of pyrolysis temperature on migration characteristics of heavy metals during biomass pyrolysis 热解温度对生物质热解过程中重金属迁移特性的影响
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101840
Zhichao Guo , Weihong Zhou , Yuanxin Liu , Xiangyu Li , Bin Bai , Fengyan Li , Chao Luo , Gaixiu Yang
In this study, the distribution, morphology, and migration characteristics of heavy metals in the products obtained at different pyrolysis temperatures were studied. With an increase in the pyrolysis temperature, the heavy metals were more inclined to volatilize into bio-oil and syngas, and the volatilization ratio was Zn > Pb > Cr > Fe > Ni > Mn > Cu. At pyrolysis temperatures below 400 °C, heavy metals were transformed from the migratory states (F1, F2, F3) to the residual state (F4). When the pyrolysis temperature exceeded 500 °C, heavy metals in migration states (F1, F2, F3) migrated to the bio-oil and syngas. The residual states (F4) of Fe, Cu, Ni, and Mn were stable. Although Zn and Pb in the residual state (F4) volatilized at high temperatures, the volatilization ratio was lower than that in the migratory state (F1, F2, and F3). At a pyrolysis temperature of 900 °C, the potential risk factor (RI) of heavy metals decreased from 448.67 to 5.21, significantly reducing the environmental risk.
本研究对不同热解温度下所得产物中重金属的分布、形态和迁移特征进行了研究。随着热解温度的升高,重金属更倾向于挥发到生物油和合成气中,挥发比例为 Zn > Pb > Cr > Fe > Ni > Mn > Cu。热解温度低于 400 ℃ 时,重金属从迁移态(F1、F2、F3)转变为残留态(F4)。当热解温度超过 500 ℃ 时,迁移态(F1、F2、F3)的重金属迁移到生物油和合成气中。铁、铜、镍和锰的残留态(F4)是稳定的。虽然残余态(F4)中的锌和铅在高温下会挥发,但挥发率低于迁移态(F1、F2 和 F3)。在 900 °C 的高温分解温度下,重金属的潜在风险系数(RI)从 448.67 降至 5.21,大大降低了环境风险。
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引用次数: 0
An experimental investigation of 1,2-dimethoxy ethane as a fuel additive in biodiesel-fueled diesel engine 将 1,2-二甲氧基乙烷作为生物柴油发动机燃料添加剂的实验研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101824
Gökhan Öztürk , Şafak Melih Şenocak , Nihat Şenocak , Müjdat Fırat
Recently, researchers have focused on the addition of various additives to biodiesel and other petroleum-derived fuels to improve combustion characteristics and reduce pollutant emissions in internal combustion engines. This study explores the effects of integrating 1,2-dimethoxy ethane (1,2-DME) into reference fuels (RF), including 100 % diesel (D100), 100 % biodiesel (B100), and a blend of 50 % diesel with 50 % biodiesel (B50). In the experiment, 1,2-DME is added at volumes of 5 %, 10 %, and 15 % while engine load is at 25 %, 50 %, and 75 %. In-cylinder pressure and temperature, heat release rate (HRR), knock intensity (RI), combustion duration (CD), ignition delay (ID), brake thermal efficiency (BTE) and pollutant emissions such as carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbon (HC), and smoke opacity are all evaluated. The findings reveal that increasing the 1,2-DME ratio in the reference fuels enhances HRR, in-cylinder pressure, and temperature. Notably, adding 10 % 1,2-DME to D100 at 25 % engine load significantly increases HRR by approximately 28.65 %. Generally, incorporating 1,2-DME reduces ignition delay, shortens ignition duration and intensifies knock (RI). Analysis of pollutant emissions indicates an increase in nitrogen oxide (NOx) emissions but a reductions in carbon monoxide (CO) and hydrocarbon (HC) emissions with 1,2-DME addition. Furthermore, adding 15 % 1,2-DME to D100 at 25 % engine load reduces smoke opacity by 59.2 %. In summary, the significant effects of 1,2-DME on reference fuels indicate its potential as a viable alternative fuel additive.
最近,研究人员主要研究在生物柴油和其他石油衍生燃料中添加各种添加剂,以改善内燃机的燃烧特性并减少污染物排放。本研究探讨了在参考燃料(RF)中加入 1,2-二甲氧基乙烷(1,2-DME)的效果,包括 100% 柴油(D100)、100% 生物柴油(B100)以及 50% 柴油与 50% 生物柴油的混合燃料(B50)。在实验中,1,2-二甲醚的添加量分别为 5%、10% 和 15%,发动机负荷分别为 25%、50% 和 75%。对缸内压力和温度、热释放率 (HRR)、爆震强度 (RI)、燃烧持续时间 (CD)、点火延迟 (ID)、制动热效率 (BTE) 以及污染物排放(如一氧化碳 (CO)、氮氧化物 (NOx)、碳氢化合物 (HC) 和烟雾不透明度)进行了评估。研究结果表明,增加参考燃料中的 1,2-二甲醚比例可提高 HRR、缸内压力和温度。值得注意的是,在发动机负荷为 25% 的情况下,在 D100 中添加 10% 的 1,2-二甲醚,可显著提高 HRR 约 28.65%。一般来说,加入 1,2-DME 会减少点火延迟、缩短点火持续时间并加剧爆震(RI)。污染物排放分析表明,添加 1,2-DME 后,氮氧化物(NOx)排放增加,但一氧化碳(CO)和碳氢化合物(HC)排放减少。此外,在发动机负荷为 25% 的情况下,在 D100 中添加 15% 的 1,2-二甲醚可降低 59.2% 的烟雾不透明度。总之,1,2-二甲醚对参考燃料的显著效果表明,它有潜力成为一种可行的替代燃料添加剂。
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引用次数: 0
Experimental study on co-gasification of cellulose and high-density polyethylene with CO2 纤维素和高密度聚乙烯与二氧化碳共气化实验研究
IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-09-19 DOI: 10.1016/j.joei.2024.101839
Yunhui Pang, Xiaoli Zhu, Ning Li, Zhenbo Wang
Co-gasification of biomass and waste plastic with CO2 presents an effective strategy for integrating biomass conversion, waste utilization and carbon recycling. In this study, the co-gasification of cellulose and high-density polyethylene with CO2 was investigated experimentally. The effects of mixing ratio and temperature on co-gasification characteristics, including gas yield, product gas composition, lower heating value of syngas and gasification efficiency, were comprehensively evaluated. Additionally, the interaction between cellulose and high-density polyethylene was analyzed. The results suggested that increasing the polyethylene content in feedstock resulted in decreased yields of H2 and CO, increased CH4 yield, increased lower heating value of syngas and reduced gasification efficiency. The interaction between cellulose and high-density polyethylene enhanced the gas yield, with the most significant effect at 40 % polyethylene content. In the range of 900 °C–1000 °C, increasing the temperature resulted in increased gas yield, reduced lower heating value of syngas and increased gasification efficiency. The positive interaction between cellulose and high-density polyethylene on gas yield was more significant at higher temperatures. This work shed light on reaction characteristics for co-gasification of biomass and high-density polyethylene with CO2, laying the foundation for the design and application of this technology.
生物质和废塑料与二氧化碳共气化是一种集生物质转化、废物利用和碳回收于一体的有效策略。本研究对纤维素和高密度聚乙烯与二氧化碳的共气化进行了实验研究。全面评估了混合比和温度对共气化特性的影响,包括产气量、产品气体成分、合成气的较低热值和气化效率。此外,还分析了纤维素与高密度聚乙烯之间的相互作用。结果表明,增加原料中的聚乙烯含量会导致 H2 和 CO 产率降低、CH4 产率增加、合成气热值降低和气化效率降低。纤维素和高密度聚乙烯之间的相互作用提高了气体产率,聚乙烯含量为 40% 时效果最显著。在 900 ℃-1000 ℃ 范围内,提高温度可增加产气量,降低合成气的较低热值,提高气化效率。在较高温度下,纤维素和高密度聚乙烯对产气量的正向作用更为显著。这项工作阐明了生物质和高密度聚乙烯与二氧化碳共气化的反应特性,为该技术的设计和应用奠定了基础。
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Journal of The Energy Institute
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