对装有氧化催化器（diesel oxidation catalyst，DOC）和颗粒捕集器（diesel particulate filter，DPF）后处理系统的柴油机进行台架试验，利用烟气分析仪（Testo 350XL）和发动机废气排放颗粒物粒径谱仪（TSI EEPS 3090）研究不同负荷下柴油机原机、DOC后和DPF后排气中氮氧化物(NOx)和颗粒物（particulate matter，PM）的变化规律.结果表明:负荷大于50.0%时，DOC后的NO2体积分数φ（NO2）显著增加,柴油机原机氮氧化物中NO2体积分数φ（NO2/NOx）随负荷增加而减小，DOC后和DPF后的φ（NO2）、φ（NO2/NOx）随负荷增加先减小、后增大;柴油机原机PM排放取决于柴油机的运行工况,不同负荷下DOC的PM去除率为15%~30%，50.0%负荷下DOC的PM去除率最高，为26%；DPF的PM去除率超过90%，经过DPF后核态颗粒体积分数明显增加，聚集态颗粒体积分数明显减小.
Abstract
Based on the diesel engine bench equipped with diesel oxidation catalyst (DOC) and diesel particulate filter (DPF), the flue gas analyzer of Testo 350XL and the engine exhaust particle size spectrometer of TSI EEPS 3090 were used to investigate NOx and particulate matter(PM) variation under different loads before and after the DOC and after the DPF. The results show that the NO2 volume fraction of φ（NO2）is increased significantly after DOC when the load is greater than 50.0%. With the increasing of engine load, NO2 volume fraction in nitrogen oxides φ（NO2/NOx）of the raw diesel engine is decreased, while the φ（NO2） and φ（NO2/NOx） of the DOC and the DPF are decreased first with latter increasing. The raw diesel engine PM emission is depended on the operation conditions of the diesel engine. The PM removal rate of DOC is 15%-30% under different loads, and the PM removal rate of DOC under 50.0% load has the highest value of 26%. The PM removal rate of DPF is exceeded 90%. The nucleated particles volume fraction after DPF is increased, while aggregated particles volume fraction is decreased.
关键词
柴油机 /
氧化催化器 /
颗粒捕集器 /
颗粒物 /
排放
{{custom_keyword}} /
Key words
diesel engine /
diesel oxidation catalyst /
diesel particulate filter /
particulate matter /
emission
{{custom_keyword}} /
中图分类号：
{{custom_clc.code}}
({{custom_clc.text}})
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
［1］KOZINA A, RADICA G, NI-ETIC＇ S. Analysis of methods towards reduction of harmful pollutants from diesel engines[J]. Journal of Cleaner Production, DOI:10.1016/j.jclepro.2020.121105. ［2］中华人民共和国生态环境部. 中国移动源环境管理年报(2021)[R]. 北京：中华人民共和国生态环境部, 2021.
［3］张允华,楼狄明,谭丕强, 等. DOC+CDPF对重型柴油车排放特性的影响[J]. 环境科学, 2017, 38(5):1828-1834. ZHANG Y H, LOU D M, TAN P Q, et al. Effects of DOC+CDPF on emission characteristics of heavy-duty diesel vehicle[J]. Environmental Science, 2017, 38(5): 1828-1834.（in Chinese）
［4］商潭苏，魏明亮，孙平，等. Fe-FBC燃油对柴油机醛类和颗粒物排放的影响[J]. 江苏大学学报（自然科学版）, 2021, 42(2): 125-130. SHANG T S, WEI M L, SUN P, et al. Effect of Fe-FBC fuel on aldehydes and particulate matter emissions of diesel engine[J]. Journal of Jiangsu University（Natural Science Edition）, 2021, 42(2): 125-130.（in Chinese）
［5］沈颖刚,廖凭皓,陈春林,等. 柴油机加装柴油机氧化催化器和催化型颗粒捕集器装置性能评定试验研究[J]. 内燃机工程, 2020, 41(4): 17-26. SHEN Y G, LIAO P H, CHEN C L, et al. Experimental study on performance evaluation of a diesel engine equipped with diesel oxidation catalytic and catalytic diesel particulate filter system[J]. Chinese Internal Combustion Engine Engineering, 2020, 41(4): 17-26.（in Chinese）
［6］陈贵升，和志高，沈颖刚，等. 掺混PODE对DOC＋CDPF氧化及再生特性的影响[J]. 内燃机学报, 2020, 38(1): 64-72. CHEN G S, HE Z G, SHEN Y G, et al. Effect of blending PODE on DOC+CDPF performance of a diesel engine[J]. Transactions of CSICE, 2020, 38(1): 64-72.（in Chinese）
［7］TAN P Q, ZHONG Y M, HU Z Y, et al. Size distributions, PAHs and inorganic ions of exhaust particles from a heavy duty diesel engine using B20 biodiesel with different exhaust aftertreatments[J]. Energy, 2017, 141 : 898-906.
［8］SRINIVASAN A, PRICE K. Consolidation of DOC and DPF functions into a single component[J]. SAE Technical Papers, DOI: 10.4271/2019-01-0583.
［9］SHUDO T, OMORI K, HIYAMA O. NOx reduction and NO2 emission characteristics in rich lean combustion of hydrogen[J]. International Journal of Hydrogen Energy, 2008, 33(17): 4689-4693.
［10］JIAO P H, LI Z J, SHEN B X, et al. Research of DPF regeneration with NOx PM coupled chemical reaction[J]. Applied Thermal Engineering, 2017, 110 : 737-745.
［11］林柏洋，刘旻，胡琨，等. 掺混甲烷对预混合丙烯火焰碳烟生成的影响[J]. 内燃机学报, 2021, 39(1): 61-66. LIN B Y, LIU M, HU K, et al. Effect of methane blending on soot formation in premixed propene flame[J]. Transactions of CSICE, 2021, 39(1): 61-66.（in Chinese）
［12］方嘉，蒋渊，孟忠伟，等. O2 /NO2氛围下颗粒物的氧化催化特性试验[J]. 江苏大学学报（自然科学版）, 2019, 40(5): 518-523. FANG J, JIANG Y, MENG Z W, et al. Oxidation and catalytic characteristics of particulate with O2 /NO2 condition[J]. Journal of Jiangsu University（Natural Science Edition）, 2019, 40(5): 518-523.（in Chinese）
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
国家自然科学基金资助项目（51806085）； 江苏省高等学校自然科学研究重大项目（21KJA470001）
{{custom_fund}}
PDF(2404 KB)
