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The mathematical model for the microwave regeneration of diesel particulate filter is proposed according to the characteristic of microwave regeneration process. The model is used to calculate the temperature field, distribution of particulate and density field of oxygen in the filter during the process of regeneration with typical ceramic foam particulate fitter data. The parametric study demonstrates how some of the main parameters, such as microwave attenuation constant of the filter, filter particulate loading, the power and distribution of microwave energy and so on, affect the efficiency of regeneration, the maximum filter temperature and regeneration duration. The results show that it is possible to regenerate the diesel particulate filters in certain conditions by using microwave energy.

This paper mainly deals with the harmful emission control problem of the diesel engine. Many research works have been carried out on the catalytic conversion of diesel emissions. First, a few kinds of catalyst are prepared, selected by Thermogravimetric Analysis (TGA) and Differential Thermal Analysis (DTA). Three types of catalytic converter are developed. Engine bench tests on these converters loaded with selected catalysts are made. Testing contents are: (1) conversion rate of harmful gases; (2) reduction effect of exhaust smoke; (3) resistant performance of converters and their influences on the engine, etc. Finally, through comparison, the effective catalytic converter is installed on a folklift truck for testing and durability examination. Testing results show that the catalytic converter has higher conversion rate on gaseous emissions, especially for CO and NOx. After two months running, the conversion rates basically keep the original level.

The catalytic conversions of diesel exhausting particulates (DEP) are studied in this paper. The oxidation catalysts, carried by Y-Al,O, pellets, are prepared with the method of impregnation. By use of thermo-gravimetric analysis (TGA) technique, the catalytic abilities of these catalysts are studied and the igniting characteristics of DEP are determined. A mathematical method is introduced to process TGA experimental data furtherly. Some equations have been derived to evaluate the kinetic parameters of the oxidation reaction of DEP. By comparing the activation energy (Ea) of the reaction and the igniting temperature (Ti) of DEP, the catalytic activities of the oxidation catalysts are evaluated.

It is a new idea and beneficial attempt that the microwave heating technology is applied to regenerate the Diesel Exhaust Particulate Filters (DEPF). In this paper, the microwave regenerating mechanism of DEPF is studied and some laws in the process of microwave regeneration are found by experimental and theoretical analyses. Some basic measurements and calculations of microwave characteristic factors of three kinds of selected DEPF and the pure particulate are presented. A Microwave Regenerating Test System (MRTS) is set and the microwave regeneration of DEPF is tested. A mathametical model of two dimensional axi-symmetrical non-steady temperature field is set up which is suitable for microwave regenerating process of ceramic foam filters. The numerical calculation and practical analyses are stated. It is proved by these studies that the particulate in DEPF is selectively heated by microwave energy and moreover the microwave energy is less absorbed by the pure ceramic filters.

In this paper, a new turbulent-film type direct injection combustion system with reentrant multi - lobe combustion chamber and helical intake port to form intake swirl, squish, macro and micro turbulence and to realize the combustion process with mainly the space atomization and partly the film evaporation. The test results indicated are: increasing the power output, lowering the fuel consumption, decreasing the peak pressure and the rate of pressure rise and improving the Nox emissions. The design, experiment and theoretical analysis of this system are presented and a brilliant prospect is expected.

Taking a specific diesel engine as a calculation example, three kinds of ptimized calculation methods are studied in detail for the optimization of the performance of Diesel Engine cycle and the following conclusions are drawn: Sequential Linear Programming (S.L.P) suits for the rough optimized calculation of the performance of Diesel Engine cycle. Sequential Unconstrained Minimization Technique (S.U.M.T) suits for the precise optimized calculation of the performance of Diesel Engine cycle with less variables. Orthognal Network Optimization Method (O.N.O.M) has a wide adaptability, but calculating time is longer, it suits for the precise optimized calculation of the performance of Diesel Engine cycle with more variables.