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煤基燃料燃烧颗粒物对颗粒捕集器沉积过程的影响

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探讨了柴油机燃用代用燃料后,排气颗粒物结构特征的变化规律.依据柴油机台架试验,使用0%、5%、15%甲醇掺混比的F-T(Fischer-Tropsch)合成柴油,在标定工况下采集颗粒.用同步辐射小角散射分析方法测量颗粒物摩擦力、粒径等参数.基于实验数据,在EDEM软件中建立颗粒模型,模拟了颗粒碰撞沉积过程.结果表明:随甲醇掺混比的增加,甲醇、F-T柴油燃烧颗粒间摩擦力增加0.6 N,平均粒径增加2.44 nm.沉积过程中,颗粒捕集器(DPF)单元体非迎风面的沉积量急剧增加;颗粒沉积效率随沉积时间的增加而增加;随摩擦力增大、粒径增大,颗粒层厚度及颗粒链长度也随之增加.甲醇掺混比的改变使得颗粒整体向更多、更细的方向变化,燃料类型及掺混比的改变显著影响了颗粒在DPF载体上的沉积状态.
Influence of coal-based fuel combustion particles on DPF deposition process
The study explored the changes in the structural characteristics of exhaust particulate matter when diesel engines burn alternative fuels.Based on diesel engine bench tests,particles were collected under calibrated conditions using F-T(Fischer-Tropsch)synthetic diesel fuel blended with 0%,5%,and 15%methanol.The friction force and particle size parameters of the particulate matter were measured using synchrotron small-angle scattering analysis.A particle model was established in the EDEM software based on experimental data,simulating the particle collision and deposition process.The results show that as the methanol blending ratio increases,the friction force between methanol and F-T diesel combustion particles increases by 0.6 N,and the average particle size increases by 2.44 nm.During the deposition process,the number of particles deposited on the non-windward side of the Diesel Particulate Filter(DPF)unit body increases sharply;the particle deposition efficiency increases with the deposition time;as the friction force and particle size increase,the particle layer thickness and particle chain length also increase.The change in the methanol blending ratio leads to a transformation of particles towards more numerous and finer ones,significantly affecting the deposition state of particles on the DPF substrate due to changes in fuel type and blending ratio.

diesel enginesalternative fuelsmethanol/Fischer-Tropsch(F-T)synthetic dieselparticle matterdiesel particulate filter(DPF)EDEM softwaresmall angle scattering

朱鑫昌、刘帅、王忠、华伦、帅石金

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江苏大学 汽车与交通工程学院,镇江 212013,中国

清华大学 苏州汽车研究院,吴江 215200,中国

清华大学,智能绿色车辆与交通全国重点实验室(原汽车安全与节能国家重点实验室),北京 100084,中国

柴油机 代用燃料 甲醇、甲醇/F-T合成燃料 颗粒物 柴油机微粒捕集器(DPF) EDEM软件 小角散射

汽车安全与节能国家重点实验室开放基金江苏省自然科学基金江苏省高校自然科学研究项目南通市科技计划项目

KFY2227BK2020091021KJD470002JC2021166

2024

10.3969/j.issn.1674-8484.2024.01.007

汽车安全与节能学报
清华大学

汽车安全与节能学报

CSTPCD北大核心
影响因子：0.748
ISSN：1676-8484
年,卷(期)：2024.15(1)
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