柴油机排气微粒过滤体微波加热再生过程的优化

利用微波加热柴油机排气微粒过滤体是一种有望解决过滤体热再生易损坏难题的新颖方法。本文针对自行设计的过滤体微波加热再生系统建立了一个 2维非稳态传热传质模型。模型考虑了再生过程中微波空间加热、二次空气、微粒燃烧等众多因素 ,并得到了实验验证。利用该模型研究了空气保温层、二次空气流速及含氧量、过滤体中微粒沉积量、微波功率及微波加热时间等因素对再生效率、再生速率、再生温度及再生时间等参数的影响。所获得的优化参数被用于实用装置的控制 ,使再生过程缩短到 5～ 7min,而再生温度被控制在可接受范围内

Optimization of the regeneration of a diesel filter using microwave heating

Microwave heating is one method for avoiding diesel filter damage caused by regeneration using extornal heat sources. The regeneration process is affected by many factors. A two dimensional unsteady heat and mass transfer model was developed based on the microwave heating system for diesel particulate filter regeneration to study the influence of each factor. Several parameters, such as the spatial microwave heating rate, the secondary air, and of particulate combustion, are considered in the model which has been tested and verified. The effects of the hot air sheath, the velocity and oxygen ratio of the secondary air, the quantity of particulates in the filter, the microwave power and the microwave heating time were studied using the model. Parameters optimized by the model can be used for practical device control. The optimal regeneration process is more practical since the regeneration time is reduced to 5~7 minutes and the maximum temperature is within the acceptable range.