微波在柴油机滤烟器催化再生中的应用Ⅱ.滤烟器在含氧气氛中的微波加热催化再生

MICROWAVE ASSISTED CATALYTIC REGENERATION OF DIESEL SOOT FILTER Ⅱ. Catalytic Regeneration of Diesel Soot Filter in O_2 Atmosphere by Microwave Heating

采用柴油机台架装置及微波加热装置，考察了柴油机催化滤烟器的微波加热再生效应．结果表明，过滤体上捕集的碳烟量对催化滤烟器在氧气中的微波加热燃烧再生至关重要，只有捕集的碳烟量超过某一下限值，滤烟器上的碳烟才有可能被微波加热至起燃温度； 但碳量也不可超过一上限值，否则滤烟器的微波加热催化再生可能失去控制，碳烟急剧燃烧产生的热量将使过滤基质烧结． 此碳烟上下限再生窗口随催化剂活性的差异而有所改变． 研究中还发现，在再生过程中，产物中ＣＯ和ＣＯ２ 的比率有较大波动．

By using of the microwave heating setup and engine test bed, an experimental study has been carried out to investigate the regeneration performance in oxidizing atmosphere under microwave irradiation. The results indicated that the content of soot trapped in filter violently influenced the combustion of filter by microwave heating. Only when the soot content exceeded a lower limit, could the filter be heated to the ignition temperature of soot and achieve regeneration. But the soot content couldn′t go beyond an upper limit, otherwise the strong exotherm resulted from the vigorous combustion of soot would destroy the filter by sintering. The window between the lower and upper limit was changeable with activity difference of catalysts impregnated in filters. The analysis of the combustion products revealed that the more acute burning of diesel soot by microwave heating led to an obvious increase in carbon monoxide compared with electric heating, the usage of catalyst for deep oxidation could increase the ratio of CO 2 to CO apparently.