Research On Mechanism Of Multi-field Synergy And Particulate Combustion In Composite Regeneration Process Of Diesel Particulate Filter

Diesel particulate filter is the most efficient diesel particulate emissionspost-processed devices. How to optimize the regeneration process of diesel particulatefilter and improve the efficiency of regeneration effectively are bottleneck problems torestrict its universal application. In order to solve this question, a lot of model theoriesand experimental studies have been researched on at home and abroad. Indicate that asingle active regeneration or passive regeneration has the advantage at the same timealso has some obvious disadvantages. The composite regeneration in which microwaveregeneration combined with suitable amount of cerium-manganese based additivesregeneration not only can make additive reduce the light-off temperature of particlerapidly, but also can improve the utilization rate of microwave energy and reduce theconsumption of electrical energy. This composite regeneration is superior to single orother composite regeneration. But how to differentiate and analyze compositeregeneration of diesel particulate filter and mechanism of multi-field synergy, and howto improve the efficiency of regeneration and reduce microwave power are problems tobe resolved firstly.The thesis supported by national natural science fund project [51176045], whichis “Research on optimization and mechanism of multi-field synergy in the compositeregeneration of diesel particulate filter”. Using the method combined by numericalsimulation method, field synergy theory and grey theory method to research thestrengthening and multi-field synergy of particle combustion in the process ofcomposite regeneration of diesel particulate filter. The innovations and main researchcontents are shown below:(1) To establish the mathematical model of porous media in the filter of dieselparticulate filter and physical model of chemical reaction of particulate combustion.The result shows that the parameter changes in internal-field (velocity field,temperature field, concentration field) affects larger on filter temperature andregeneration characteristic. We should choose a good synergy degree when thecomposite regeneration of porous media in the diesel particulate filter happens.(2) To build mathematical model in the process of composite regeneration ofdiesel particulate filter by multi-field synergy theory and analyze the variation of heattransfer between the burning two-phase flow of gas-particulate and the wall of porous media in the process of filter regeneration. To promulgate the mechanism of multi-fieldsynergy and strengthening of filter’s heat transfer rate and regeneration characteristicaffected by strengthened heat transfer and internal-field synergy, intensity of externalmagnetic field and internal-field synergy.(3) To calculate the influencing factors in the process of composite regenerationof diesel particulate filter by using the method of grey relational analysis. Topromulgate the mechanism of regeneration performance indicators, such as the highestregeneration temperature, regeneration efficiency and heat transfer rate, affected byvelocity field, temperature field, electromagnetic field and synergy angle, etc.