基于国六排放标准的天然气发动机试验研究
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摘要
在发动机排放试验台上,对一台天然气发动机按照国六排放标准和国五排放标准分别进行了WHTC循环试验和ETC循环试验,进行了气体污染物排放的比较研究。结果表明,WHTC循环条件下,冷启动试验的CH_4和NO_x排放高于热启动试验,NH_3排放低于热启动试验。冷启动试验的CH_4、NO_x排放量占冷+热加权试验结果的比重分别为47.10%和48.92%,与WHTC循环冷启动+热启动试验加权结果相比,ETC循环试验的CH_4和NO_x排放有显著的下降,NH_3排放有一定的增加。
On the engine emission test bench,a natural gas engine was subjected to the WHTC cycle test and the ETC cycle test according to the CHINA VI and CHINA V Emission Standards respectively,and the comparative study of gaseous pollutants emission was carried out. The results show that the CH_4 and NO_x emissions over the cold WHTC cycle are higher than those over the hot WHTC cycle;however,the cold start emission of NH_3 is lower than the hot start. The CH_4 and NO_x emissions in the cold start test accounted for 47.10% and 48.92% of the cold and hot state weighted test results respectively. Compared with the weighted results of the WHTC cycle from cold and hot start test,for the ETC cycle test a significant decrease in the CH_4 and NO_x emissions occurs and there is a certain increase in NH_3 emissions.
On the engine emission test bench,a natural gas engine was subjected to the WHTC cycle test and the ETC cycle test according to the CHINA VI and CHINA V Emission Standards respectively,and the comparative study of gaseous pollutants emission was carried out. The results show that the CH_4 and NO_x emissions over the cold WHTC cycle are higher than those over the hot WHTC cycle;however,the cold start emission of NH_3 is lower than the hot start. The CH_4 and NO_x emissions in the cold start test accounted for 47.10% and 48.92% of the cold and hot state weighted test results respectively. Compared with the weighted results of the WHTC cycle from cold and hot start test,for the ETC cycle test a significant decrease in the CH_4 and NO_x emissions occurs and there is a certain increase in NH_3 emissions.
引文
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[3]尤秋菊,张来斌,王朝晖,等.天然气发动机供气方式及特点分析[J].柴油机,2007,29(1):42-45.YOU Qiuju,ZHANG Laibin,WANG Zhaohui,et al.Fuel Supplying System and Its Characteristic Analysis of Natural Gas Engine[J].Diesel Engine,2007,29(1):42-45.(in Chinese)
[4]马义,王晓辉,李红洲,等.欧Ⅵ天然气发动机关键技术研究[J].车用发动机,2016(2):71-75.MA Yi,WANG Xiaohui,LI Hongzhou,et al.Research on Key Technologies of Europe VI Natural Gas Engine[J].Vehicle Engine,2016(2):71-75.(in Chinese)
[5]刘敬平,杨汉乾,王树青,等.改善增压天然气发动机排放特性的途径[J].中南大学学报(自然科学版),2012,43(1):143-150.LIU Jingping,YANG Hanqian,WANG Shuqing,et al.Approach of Improvement in Emission Characteristic of Turbocharged CNG Engine[J].Journal of Central South University(Science and Technology),2012,43(1):143-150.(in Chinese)
[6]翟康,施崇槐,韩志强,等.过量空气系数和点火提前角对CNG发动机NOx排放性能的影响[J].湖北汽车工业学院学报,2014,28(4):13-17.ZHAI Kang,SHI Chonghuai,HAN Zhiqiang,et al.Impact of Excess Air Ratio and Ignition Timing on CNGEngine Emissions[J].Journal of Hubei University of Automotive Technology,2014,28(4):13-17.(in Chinese)
[7]李勇,赵淑莉,马凡华,等.两种天然气专用氧化型催化器的对比试验研究[J].小型内燃机与摩托车,2007,36(4):47-50.LI Yong,ZHAO Shuli,MA Fanhua,et al.A Comparative Test Research on Two Kinds of CNG Special Oxidation Catalyst Converters[J].Small Internal Combustion Engine and Motorcycle,2007,36(4):47-50.(in Chinese)
[8]马凡华,许忠厚.天然气发动机专用催化转化器的研究与发展[J].车用发动机,2000(1):1-3.MA Fanhua,XU Zhonghou.Research and Development of Dedicated Catalytic Converts for Natural Gas Engine[J].Vehicle Engine,2000(1):1-3.(in Chinese)
[9]ZHANG Qiang,LI Menghan,SHAO Sidong,et al.Ammonia Emissions of a Natural Gas Engine at the Stoichio-Metric Operation with TWC[J].Applied Thermal Engineering,2018,130:1363-1364.
[10]GB17691-2005.车用压燃式、气体燃料点燃式发动机与汽车排气污染物排放限值与测量方法(中国Ⅲ、Ⅳ、Ⅴ阶段)[S].北京:中国标准出版社,2005.GB17691-2005.Limits and Measurement Methods for Exhaust Pollutants from Compression Ignition and Gas Fueled Positive Ignition Engines of Vehicles(Ⅲ,Ⅳ,Ⅴ)[S].Beijing:China Standard Press,2005.(in Chinese)