不同堆积方式下碳黑颗粒氧化特性的实验研究

Experimental Study on Oxidation Characteristics of Carbon Black Particle Under Different Stacking Modes

本文将自由堆积和DPF中错流沉积碳黑颗粒的氧化再生进行对比,从气体排放、颗粒物排放、氧化再生效率以及能量利用率进行分析,探索DPF再生时气体和颗粒排放规律和特性。实验结果表明:自由堆积碳黑颗粒受热升温快,生成的CO/CO_(2)气体很快达到峰值,但氧扩散受限,气体达到峰值后缓慢下降。DPF载体传热缓慢,错流沉积碳黑颗粒氧化产生气体的出峰时间延后,但来流充分与颗粒接触,生成气体峰值大,再生迅速且效率高,排出的颗粒物数量浓度升高,且存在大粒径颗粒物释放现象。提高温度,两种堆积方式的氧化再生效率增加,实时效能比先升高后下降,存在最佳的加热时间。本文研究结果将为探索DPF再生时出口颗粒排放特性,颗粒物来源分析奠定理论基础和实验参考。

In this paper,the oxidation regeneration of free accumulated carbon black particles and cross flow deposited carbon black particles in DPF are compared.The gas emission,particle emission,oxidation regeneration efficiency and energy utilization are analyzed to explore the gas and particle emission laws and characteristics during DPF regeneration.The experimental results show that the temperature rise of free accumulated carbon black particles is fast,and the generated CO/CO_(2) gas reaches the peak soon,but the oxygen difusion is limited,and the gas decreases slowly after reaching the peak.The heat transfer of DPF carrier is slow,and the peak time of gas generated by the oxidation of cross fow deposited carbon black particles is delayed,but the incoming flow is in full contact with the particles,resulting in large peak value of generated gas,rapid regeneration and high efficiency,increased particle number of discharged particles,and release of large particle size particles.With the increase of temperature,the oxidation regeneration efficiency of the two stacking methods increases,the real-time efficiency ratio first increases and then decreases,and there is the best heating time.The research results of this paper will lay a theoretical foundation and experimental reference for exploring the outlet particle emission characteristics and particle source analysis during DPF regeneration.