超低熱值燃氣多孔介質(zhì)燃燒器燃燒特性的研究
[Abstract]:This paper is based on the original ultra-low calorific value gas burner in porous media. The influence of the building block arrangement structure of porous media on the combustion limit of the burner and the pollutant emission corresponding to the limit condition are studied. By comparing the combustion limits of different building block arrangement structures, we try to find a structure with outstanding comprehensive performance in the aspects of heat adaptability and low pollution emission. The results of this paper provide a new way for the efficient and clean utilization of ultralow calorific gases. In this paper, three kinds of building block core structures, CAPM-A type, CAPM-B type and CAPM-C type, are explored by means of numerical simulation. For the inner core structure of CAPM-A, we have also carried out the experimental research and compared with the corresponding simulation results. In CAPM-A core structure, the pore size of porous media decreases gradually from upstream to downstream, whereas CAPM-B core structure is the opposite. The results show that the heat value of CAPM-B core structure is good, and it can burn gas whose minimum calorific value is 1.2MJ/Nm3. The minimum calorific value of CAPM-A core structure is 1.4MJ / Nm3.In addition, the performance of CAPM-B core structure is better than that of CAPM-A core structure in terms of stable combustion region and low pollution emission. The above conclusion further indicates that the core structure of the porous media with block arrangement should follow the trend of increasing from upstream to downstream in pore size. Considering that the pore size of porous media close to the wall of the inner cylinder will affect the preheating effect of fresh gas between the inner and outer cylinders, we have explored the CAPM-C core structure on the basis of the CAPM-B inner core structure. The difference between it and the core structure of CAPM-B is that the pore density of the porous media near the wall is 5 PPI less than that of the corresponding CAPM-B type. The results show that the heat adaptability of CAPM-C core structure is poor, and the minimum calorific value of 1.5MJ/Nm3 gas can be burned. In addition, the performance of CAPM-B core structure is better than that of CAPM-C core structure in terms of stable combustion region and low pollution emission. For each core structure, whether it is tempering limit or de-tempering limit, the power of limit condition increases with the increase of calorific value, the power of de-tempering limit is larger than corresponding tempering limit when calorific value is fixed. The range of stable combustion region between tempering limit and tempering limit increases with the increase of calorific value. The CO emissions corresponding to the tempering limit are larger than the CO emissions at the de-tempering limit, and the CO emissions increase with the decrease of the gas calorific value. The results of comparison of each inner core structure show that when other conditions are the same, the comprehensive performance of CAPM-B type is superior to that of other arrangement structures in the adaptability of calorific value, the range of stable combustion region and the low pollution emission. When adopting the inner core structure of CAPM-B, The minimum calorific value corresponding to the steady combustion of ultralow calorific value gas porous medium burner is 1.2 MJ / Nm ~ (3), and the corresponding minimum combustion intensity is 61.15 kW/m2, when the combustion intensity is greater than 61.15 kW/m2 if the appropriate calorific value is selected. The gas can be burned stably in this porous medium burner.
【學(xué)位授予單位】:河北工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TQ052.73
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