用具有三维连通网状结构的导电SiC泡沫陶瓷作为净化柴油车尾气中CO和HC的催化剂载体. 模拟计算了气体通过泡沫陶瓷的过程, 研究了电功率、 脉冲占空比对模拟柴油机排气中HC和CO转化效率的影响和电加热时催化剂的起燃温度特性. 结果表明: 导电SiC泡沫陶瓷的三维结构能增加尾气与催化剂的接触几率, 电加热能有效地提高反应气体的温度, 从而提高了排气较低温度下HC和CO的转化效率. 脉冲电流比连续电流使导电SiC泡沫陶瓷具有更强的电加热能力, 并且加热能力随着脉冲占空比的减小而增强.
SiC foam conductive ceramic with 3D reticulate structure was used as carrier of catalyst for purifying CO and HC of diesel exhaust. The process of gas passing through foam ceramic was simulated, and the effects of electric power, pulse duty cycle on conversion of HC and CO and the character of light-off temperature with electrical heating were investigated. The result showed that the 3D reticulate structure of foam ceramic could increase the contact chance of gases with carrier, and the electrical heating could increase the temperature of inlet gas, so the conversions of HC and CO were improved at lower temperature. The pulse current had stronger ability of heating than continuous current, and the capacity of heating enhanced with the decrease of pulse duty cycle.
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