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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
Using microwave to heat diesel particulate filter is a new method that is expected to solve the difficult problem of easy thermal regeneration of filter. In this paper, a two-dimensional unsteady heat and mass transfer model is established for the self-designed microwave heating regeneration system. The model takes into account many factors such as microwave space heating, secondary air and particle combustion in the regeneration process, and has been experimentally verified. The model was used to study the effects of air temperature, secondary air velocity and oxygen content, particle deposition in the filter body, microwave power and microwave heating time on regeneration efficiency, regeneration rate, regeneration temperature and regeneration time. The obtained optimization parameters were used for the control of the utility device, the regeneration process was shortened to 5 to 7 minutes, and the regeneration temperature was controlled within the acceptable range