摘要
微粒和PAHs是柴油机排放污染物的重要组成部分,为揭示燃用生物柴油(biodiesel,下称BD)与采用CRPT(连续再生微粒捕集系统,continuous regeneration particulate traps system)技术后对柴油机排放中微粒粒子数浓度和PAHs组分质量的影响规律,利用内燃机综合测试台架对3台排量不同的柴油机进行微粒以及PAHs测试,研究不同微粒粒径对应的粒子数浓度变化规律以及PAHs各组分的质量变化规律.结果表明:(1)燃用BD对柴油机微粒排放中的聚集态粒子数浓度和总质量影响较大,对核态粒子数浓度影响不大,其中,聚集态粒子总质量降幅最大可达97.04%,粒子数浓度最大降幅从10~9m^(-3)降至10~6m^(-3),而核态粒子数浓度变化不大,但粒子数比例有明显的上升,最大升幅为51.50%.(2)燃用BD对微粒排放中不同粒径粒子数浓度的影响导致CRPT技术条件下微粒质量捕集效率下降,最大降幅达21.10%.(3)PAHs总质量排放有明显下降,3台柴油机最大降幅分别为92.95%、91.78%和92.70%.但各组分呈现变化不一致现象,类似于二苯并蒽等部分组分质量下降幅度均达到100%,而(艹屈)和苯并蒽的质量均不降反升,其中(艹屈)的质量占燃用BD30后的多环芳香烃质量的50%左右.研究显示,采用"BD+CRPT"技术,柴油机微粒排放控制焦点应集中在核态微粒,PAHs排放的控制还应侧重于考虑(艹屈)和苯并蒽.
The PM and polycyclic aromatic hydrocarbons emissions from diesel can make pollutions for air condition.In order to know the universal law of particle number concentration and the quality of each component of polycyclic aromatic hydrocarbons using biodiesel(BD)and continuous regeneration particulate traps system,we studied particle number concentration and polycyclic aromatic hydrocarbons component quality change law for three different displacement diesel using comprehensive test bench for internal combustion engine.The results showed that:(1)Burning BD,making big impact to particle number concentration and the total mass of aggregated particles,but was just reversed to nuclear particles.Particles total mass decline range of aggregated particles was 97.04%and the particle number concentration was from 10 9 m-3 to 10 6 m-3.However,nuclear particle number concentration was not changed much,and particle number ratio increased by 51.50%maximally.(2)Burning BD,because of impacting on particle number concentration of different particles made particle trapping efficiency of CRPT for declined for its maximum proportion of 21.10%;(3)The total mass of polycyclic aromatic hydrocarbons was obvious reduced by 92.95%,91.78%,92.70%.The quality of each component of polycyclic aromatic hydrocarbons had different variation trend,the 2-dimethylbenz(a)anthracene quality was completely disappear for three diesels,but the quality of chrysene and benzanthracene was risen not fall,especially chrysene,after burning BD30,its mass was about 50%of the total mass.In conclusion,‘BD+CRPT’technical scheme and the emissions should focus on nuclear particles and chrysene and benzanthracene of polycyclic aromatic hydrocarbons.
作者
郑伟
于仙
ZHENG Wei;YU Xian(Tan Kah KEE College,Xiamen University,Zhangzhou 363105,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2018年第2期397-408,共12页
Research of Environmental Sciences
基金
国家自然科学基金项目(No.51366006)
福建省自然科学基金项目(No.2015J01223)
福建省高校新世纪优秀人才支持计划项目(No.闽教科[2015]54号)~~
关键词
CRPT(连续再生微粒捕集系统)
生物柴油
核态微粒
聚集态微粒
PAHS
continuous regeneration particulate trap(CRPT)
biodiesel
nuclear particles
aggregated particles
polycyclic aromatic hydrocarbons
