【摘要】 根据柴油机排放污染物的特点,在研究低温等离子体特点的基础上,利用化学反应动力学原理分析了利用低温等离子体净化NOx、PM、HC、CO的可行性,介绍了采用低温等离子体净化柴油机尾气的技术路线中各阶段的化学反应机理。结合现阶段柴油机所使用的排气后处理技术,设计了低温等离子体辅助SCR提高低温工况下净化效率较低的技术方案,对比分析了利用低温等离子体直接再生DPF和间接再生DPF两种方案的可行性及优缺点。在已经采用的四效催化转化技术方案的基础上,分析了基于低温等离子体的柴油机四效催化转化技术方案的优势及仍然存在的问题。研究表明,低温等离子体在净化柴油机尾气方面,具有转化效率高、处理彻底、无二次污染等优势,是值得推广利用的一项技术。更多还原

【Abstract】 According to the characteristics of pollutants emitted from diesel engine, on the basis of studying the characteristics of Non-thermal Plasma, the feasibility of purifying NOx, PM, HC and CO by using Non-thermal Plasma is analyzed by using the principle of chemical reaction dynamics, and the chemical reaction mechanism of each stage in the technical route of purifying diesel engine exhaust gas by using Non-thermal Plasma is introduced. Combined with the exhaust after treatment technology used in diesel engine at present, the technical scheme of Non-thermal Plasma assisted SCR to improve the purification efficiency under low temperature condition is designed. The feasibility, advantages and disadvantages of two schemes of direct DPF regeneration and indirect DPF regeneration by low temperature plasma are compared and analyzed. Based on the four-way catalysis technical scheme already adopted, the technical scheme based on Non-thermal Plasma is analyzed the advantages and problems of the four-way catalysis of diesel engine. The results show that Non-thermal Plasma is worth popularizing, because it has the advantages of high conversion efficiency, thorough treatment and no secondary pollution in the purification of diesel engine exhaust gas.更多还原