装有等离子体装置的柴油机颗粒物的氧化特性  

Thermo-Gravimetric Characteristics of Particulate Matter Emitted from a Diesel Engine Equipped with a Non-Thermal Plasma Equipment

作　　者：高建兵[1] 马朝臣[1] 邢世凯[2] 刘江权 孙丽玮[1] 葛蕴珊[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]河北师范大学职业技术学院,河北石家庄050024

出　　处：《北京理工大学学报》2017年第5期446-450,496,共6页Transactions of Beijing Institute of Technology

基　　金：河北省科技计划资助项目(15273703D)

摘　　要：基于电晕放电原理设计了针板式低温等离子体(NTP)发生器,降低柴油机颗粒物的排放.柴油机满负荷工况下,采集了不同采样点位置的颗粒物样品,利用热重分析仪对经过预处理的颗粒物的氧化特性进行了分析,利用热重试验结果计算了颗粒物的活化能.结果表明,预处理过程中,颗粒物的微分热重曲线呈双峰状,与原始颗粒物相比,经过NTP发生器后逃逸到大气中的颗粒物的峰值点向温度升高方向偏移.与原始颗粒物相比,微粒聚集体在空气氛围中氧化所需的温度较高,逃逸到大气中的颗粒物的氧化温度较低.经过NTP后逃逸到大气中的颗粒物的活化能显著提高,采用KAS法求得的活化能比单一升温速率法求得的活化能小,且升温速率越大,两种方法求得的活化能差别越大.A non-thermal plasma（NTP）reactor was designed based on corona discharge to reduce the particulate matter（PM）emitted from a diesel engine.Raw PM,PM escaped from NTP reactor,and PM aggregation sampled at 100% engine load were used to perform the thermogravimetric（TGA）experiments after being volatilized the VOC contained in PM.The activation energy was calculated based on the results of TGA experiments.The results show that the profiles of PM pre-treatment present double peaks phenomenon.The peak point of pre-treatment profiles of PM escaped from NTP reactor moves to higher temperature compared to raw PM.The oxidation temperature of PM aggregation is higher than raw PM while it is lower for PM escaped from NTP reactor.The calculated activation energy of PM escaped from NTP reactor is the highest among the samples.The activation energy calculated using KAS method is lower than that using single-ramp rate method and the difference is enlarged when increasing the ramp rate of single-ramp rate method.

关 键 词：柴油机颗粒物 低温等离子体 热重特性 氧化动力学 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]