After-Treatment For Reduction Of Diesel Exhaust Particulate And Infrared Heating Regeneration

With the increasing concern about environmental protection, regulation of emissions control for vehicles is more and more stringent. Thus, the control of diesel exhaust particulate (DEP) is a significant subject in the research field of I. C. Engine due to a mass of particulate matter (PM) discharging from diesel engine. In this paper, the after-treatment techniques for reduction of DEP are investigated, which induces a new type of DEP filter, ceramic wall flow, and its regeneration, the infrared heating. The new system has advantages of simplicity in the structure, working reliably and high practicability. The author's main work is as the following:1. The significance of the control for DEP is discussed at the introduction of this paper. The past development and present situation of the control techniques for DEP and the regeneration methods for DEP filter are also summarized.2. According to study on after-treatment technique, a new type of DEP filter made of ceramic wall flow, and its regeneration method, infrared heating, is put forward. The structure of filter and heater is designed, including the fixing of ceramic.3. The filtration characteristic of ceramic wall flow is analyzed theoretically for making the microcosmic depositing process of DEP clear.4. The flow resistance characteristic and filtering performance of ceramic is investigated experimentally. Besides, the influence of filter on diesel and infrared heater characteristic is analyzed too.5. The one-dimension speed distribution of gas in the ceramic wall flow is calculated by using the analytic solution of one-dimension dynamic model, and pressure drop model of the ceramic is set up. Also the influence of gas flow on particulate depositing into ceramic is considered.6. The temperature distribution induced by burning of DEP in the ceramic during regeneration process is analyzed theoretically based on calculation of heattransfer and combustion reaction. In addition, influence of regeneration flow on temperature distribution and regeneration process is analyzed simply.7. The parameters, such as the power of infrared heater, radiation wave-length scope, radiation temperature, and the oxygen concentration, flow rate, temperature of regeneration gas flow, and particulate mass deposited, and so on, are optimized to shorten regeneration duration, make the regeneration complete and decrease the peak temperature and temperature gradient.8. The automatic control system of the after-treatment is designed according to the regeneration conditions optimized.