Influence of coal-based fuel combustion particles on DPF deposition process

doi:10.3969/j.issn.1674-8484.2024.01.007

Abstract

Abstract:

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.

Key words: diesel engines, alternative fuels, methanol / Fischer - Tropsch (F-T) synthetic diesel, particle matter, diesel particulate filter (DPF), EDEM software, small angle scattering

ZHU Xinchang, LIU Shuai, WANG Zhong, HUA Lun, SHUAI Shijin. Influence of coal-based fuel combustion particles on DPF deposition process[J]. Journal of Automotive Safety and Energy, 2024, 15(1): 63-70.

Figures/Tables 16

References 21

[1]	Samavati M, Santarelli M, Martin A, et al. Production of synthetic Fischer-Tropsch diesel from renewables: Thermoeconomic and environmental analysis[J]. Energy Fuels, 2017, 32(2): 1744-1753. doi: 10.1021/acs.energyfuels.7b02465 URL
[2]	SUN Liang, HAN Haoya, LIU Zhiyong, et al. Immobilization of gold nanoparticles in spherical polymer brushes observed by small-angle X-ray Scattering[J]. Langmuir, 2022, 38(5): 1869-1876. doi: 10.1021/acs.langmuir.1c03081 URL
[3]	Maruyama T, Ohizumi T, Taneoka Y, et al. Sulfur isotope ratios of coals and oils used in China and Japan[J]. Chem Ind Chem, 2000, 15(1): 115-121
[4]	唐纯逸. 甲醇/柴油混合燃料喷雾特性与液滴相变过程研究[D]. 镇江: 江苏大学, 2022.
	TANG Chunyi. Study on the spray characteristics and droplet phase change process of methanol/diesel blends[D]. Zhenjiang: Jiangsu University, 2022. (in Chinese)
[5]	王建, 于威, 王斌. 高原状态下甲醇替代率对柴油机燃烧与排放的影响[J]. 吉林大学学报(工学版), 2023, 53(4): 954-963.
	WANG Jian, YU Wei, WANG Bin. The influence of methanol substitution rate on diesel engine combustion and emissions under plateau conditions[J]. J Jilin Univ (Engi Ed), 2023, 53(4): 954-963. (in Chinese)
[6]	宇文浩男, 王铁, 石晋宏, 等. 基于数值模型的F-T煤制油柴油机排放优化研究[J]. 机械设计与制造, 2022(6): 189-192+198.
	YU Wenhao, WANG Tie, ShI Jinhong, et al. Research on emission optimization of F-T coal to liquid diesel engine based on numerical models[J]. Mech Des Manu, 2022(6): 189-192+198. (in Chinese)
[7]	石晋宏. 基于CMLIA的F-T煤制油柴油机喷油参数优化研究[D]. 太原: 太原理工大学, 2020.
	SHI Jinhong. Optimization of fuel injection parameters of F-T coal to liquid diesel engine based on CMLIA[D]. Taiyuan: Taiyuan University of Technology, 2020. (in Chinese)
[8]	HUA Yan, LIU Shuai, LI Ruina, et al. Experimental study of regulated and unregulated emissions from a diesel engine using coal-based fuels[J]. Fuel, 2020, 280: 118658. doi: 10.1016/j.fuel.2020.118658 URL
[9]	CHEN Dongdong, WANG Tie, YANG Tiantian, et al. Effects of EGR combined with DOC on emission characteristics of a two-stage injected Fischer-Tropsch diesel/methanol dual-fuel engine[J]. Fuel, 2022, 329(5): 125451. doi: 10.1016/j.fuel.2022.125451 URL
[10]	刘帅, 姚晓航, 孙勇, 等. 甲醇/F-T柴油预混燃烧的数值模拟[J]. 江苏大学学报(自然科学版), 2022, 43(2): 139-146.
	LIU Shuai, YAO Xiaohang, SUN Yong, et al. Numerical simulation of methanol/F-T diesel premixed combustion[J]. J Jiangsu Univ (Nat Sci Ed), 2022, 43(2): 139-146. (in Chinese)
[11]	Godoy M L, Milt V G, Miró E E, et al. Scaling-up of the catalytic stacked wire mesh filters for the abatement of diesel soot[J]. Catalysis Today, 2022, 394: 434-444.
[12]	GE Junchun, Choi N. Soot particle size distribution, regulated and unregulated emissions of a diesel engine fueled with palm oil biodiesel blends[J]. Energies, 2020, 13(21): 5736-5741. doi: 10.3390/en13215736 URL
[13]	Lee K, Kim S, Oh K C. The effect of pore structure on thermal characteristics of a cordierite diesel particulate filter for heavy duty diesel vehicle[J]. Int’l J Automotive Tech, 2021, 22(1): 243-251.
[14]	Nakamura M, Ozawa M. Phenomena of PM deposition and oxidation in the diesel particulate filter[C]// 2019 JSAE/SAE Powertrains, Fuels Lubri Int’l Meet, 2019. DOI: 10.4271/2019-01-2288.
[15]	MENG Zhongwei, LI Jie, FANG Jia, et al. Experimental study on regeneration performance and particle emission characteristics of DPF with different inlet transition sections lengths[J]. Fuel, 2020, 262: 116-122.
[16]	李铭迪. 含氧燃料颗粒状态特征及前驱体形成机理研究[D]. 镇江: 江苏大学, 2014.
	LI Mingdi. Study on the state characteristics and precursor formation mechanism of oxygen containing fuel particles[D]. Zhenjiang: Jiangsu University. (in Chinese)
[17]	ZHANG Yu, WANG Zhong, LI Ruina, Study on physicochem ical properties of biodiesel and Fischer Tropsch diesel exhaust particle[J]. Energy Sour Part A: Recov Utiliz Envir Effe, 2020, 115(1): 11589.
[18]	Esayanur M S, Yeruva S B, Rabinovich Y I, et al. Interaction force measurements using atomic force microscopy for characterization and control of adhesion, dispersion and lubrication in particulate systems[J]. J Adhes Sci Tech, 2005, 19(8): 611-626. doi: 10.1163/1568561054890516 URL
[19]	王凯. 柴油机排气颗粒物在DPF壁面沉积过程研究[D]. 镇江: 江苏大学, 2021.
	WANG Kai. Research on the deposition process of diesel engine exhaust particles on the DPF wall[D]. Zhenjiang: Jiangsu University, 2021. (in Chinese)
[20]	李游. 柴油机排气过程对颗粒形貌及力学特征的影响研究[D]. 镇江: 江苏大学, 2021.
	LI You. Research on the influence of diesel engine exhaust process on particle morphology and mechanical characteristics[D]. Zhenjiang: Jiangsu University, 2021. (in Chinese)
[21]	宁智, 资新运, 王宪成. 脉动排气对柴油机微粒凝并作用的研究[J]. 燃烧科学与技术, 2023, 11: 17-22.
	NING Zhi, ZI Xinyun, WANG Xiancheng. A study on the effect of pulsating exhaust on diesel engine particle coalescence[J]. Combu Sci Tech, 2023, 11: 17-22. (in Chinese)

燃料	ω(O₂) %	ρ g·cm^-3	v mm²·s^-1	十六烷值	低热值 MJ·kg^-1
F-T柴油	0.0	0.775	2.245	75	47.35
甲醇	50.0	0.792	0.580	3	20.26
FM5	2.5	0.757	2.103	71	46.00
FM15	7.5	0.761	1.961	64	43.26

燃料	ω(O₂) %	ρ g·cm^-3	v mm²·s^-1	十六烷值	低热值 MJ·kg^-1
F-T柴油	0.0	0.775	2.245	75	47.35
甲醇	50.0	0.792	0.580	3	20.26
FM5	2.5	0.757	2.103	71	46.00
FM15	7.5	0.761	1.961	64	43.26

气缸直径	95 mm
活塞行程	115 mm
标定功率	108 kW
标定功率的转速	2 500 r/min
最大扭矩	460 Nm
最大扭矩的转速	1 750 r/min

气缸直径	95 mm
活塞行程	115 mm
标定功率	108 kW
标定功率的转速	2 500 r/min
最大扭矩	460 Nm
最大扭矩的转速	1 750 r/min

	α / %	D	分形维数	ln(q / nm^-1)
D_s	0	3.92	2.18	-2.52~-0.83
	5	3.82	2.20	-2.52~-0.83
	15	3.59	2.41	-2.52~-0.83
D_m	0	1.40	1.40	-0.83~0.68
	5	1.37	1.37	-0.83~0.68
	15	1.14	1.14	-0.83~0.68