合成气-甲醇掺烧火焰研究

Investigation of Mixing-dilution Combustion Flames of Syngas-methanol

对合成气-甲醇掺烧火焰进行了实验研究及数值分析。实验观测了火焰形态,测量了火焰温度及烟气中NOx污染物的浓度。实验表明:相同功率条件下,相比于合成气火焰,合成气-甲醇掺烧火焰尺寸略显细长、高温区温度略低、烟气中NOx排放较少。通过数值计算分析指出,合成气-甲醇掺烧火焰尺寸变长缘于火焰中甲醇未能及时消耗完,火焰温度降低缘于甲醇火焰温度较低,烟气中NOx排放减少缘于火焰中加入甲醇有利于抑制热力型NO及中间型NO的生成。

An experimental study and numerical analysis was performed of the mixing-dilution combustion flames of syngas-methanol.During the experiment,the flame morphology was observed,and the flame temperature as well as the concentration of NOx pollutants in the flue gas were measured.The test results show that under the condition of an equal power output,the shape of the mixing-dilution combustion flame of the syngas-methanol seems slightly slender as compared with that of a syngas flame,the temperature in the high-temperature zone is a bit low and the NOx emissions from the flue gas are comparatively small.A numerical calculation and analysis shows that the mixing-dilution combustion flame in question becomes longer,because the methanol in the flame has not been burnt out in time,and the drop of flame temperature comes about from a relatively low temperature of the methanol flame.The decrease of NOx emissions from the flue gas results from the addition of methanol to the flame,which is conducive to suppressing the formation of NO of both the thermal and intermediate type.