摘要
针对一台轻型柴油机,采用国Ⅳ柴油,在不使用和使用后处理装置的条件下,进行ESC循环工况（分别记为ESC-0、ESC-DP）和ETC循环工况（分别记为ETC-0、ETC-DP）下的发动机台架测试.每次测试用一对滤膜采集颗粒物,采样前后分别称重以确定颗粒物质量,进而计算排放因子.用气相色谱-质谱联机（GC-MS）分别分析每张滤膜上颗粒物的多环芳烃（PAHs）组分.ESC-0、ESC-DP、ETC-0、ETC-DP的颗粒物排放因子分别为0.12,0.05,0.48,0.16 g/（k W？h）;相应的PAHs排放因子分别为69,35,174,76μg/（k W？h）.后处理分别使颗粒物和PAHs减排56%-68%和49%-56%.总PAHs中,三环PAHs占比重最大（64%±9%）.PHE在总PAHs中占比重最大（54%±9%）.PAHs的分布与其物理化学特性、柴油中的芳烃含量有关.PAHs特征比值FA/（FA＋PY）为0.37-0.51.
Particulate matter（PM） and particle-phase polycyclic aromatic hydrocarbons（p-PAHs） emission characteristics were studied using a China IV diesel engine equipped with Diesel Oxidation Catalyst ＋ Particulate Oxidation Catalyst emission control device（DOC＋POC） fueled with China IV diesel. The engine was tested with an engine dynamometer four times： during ESC cycle without and with emission control device, during ETC cycle without and with emission control device（marked as ESC-0, ESC-DP, ETC-0 and ETC-DP, respectively）. PM was sampled using a pair of Pallflex Emfab filters, which were weighed before and after sampling to calculate the mass of PM. PAHs in PM were measured by Gas Chromatography-mass Spectrometry（GC-MS）. For ESC-0, ESC-DP, ETC-0 and ETC-DP, PM emission factors were 0.12, 0.05, 0.48 and 0.16g/（k W·h）, respectively, and p-PAHs emission factors were 69, 35, 174 and 76μg/（k W·h）, respectively. With emission control device, PM emissions were reduced by 56%-68%, and PAHs emissions were reduced by 49%-56%. In total p-PAHs mass, three-ring PAHs accounted for 64% ± 9%, and PHE accounted for 54% ± 9%. The distribution of PAHs was influenced by physicochemical characteristics of PAHs and PAHs contents in diesel. The FA/（FA＋PY） ratios were 0.37-0.51.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2016年第2期376-381,共6页
China Environmental Science
基金
国家自然科学基金资助(21477057)
关键词
国Ⅳ柴油机
后处理装置
台架测试
颗粒物
多环芳烃
特征比值
China IV diesel engine
emission control device
dynamometer test
particulate mass（PM）
polycyclic aromatic hydrocarbons（PAHs）
diagnostic ratios
