以某热电公司 330 MW锅炉为研究对象,基于 Fluent数值模拟软件对煤粉与棉秆混燃特性进行研究.以其结构参数与运行参数为依据,研究纯煤工况以及生物质不同掺烧比例、不同掺烧方式的 6 种工况.通过分析各个工况时炉膛的速度场、温度场、烟气组分及污染物 NO 的变化趋势,确定出最佳燃烧方式以提高燃煤效率,减少 NO 污染物排放.结果显示:相比于纯煤燃烧,掺烧棉秆后炉内主燃区温度降低,炉膛出口 O2含量减少,NO 排放量随掺烧比例增大而减小.在掺烧方式的比较中,只在 D 层喷入棉秆有利于减少 NO 排放,其 NO 排放率较混合燃烧工况降低了 15.2%.
Numerical Simulation Study on Combustion Characteristics Influences When Co-Firing Cotton Stalks in Coal-Fired Boiler
Taking the 330 MW boiler of a thermal power plant as the research object,co-firing pulverized coal and cotton stalk is studied using Fluent software.Based on its structural parameters and operation parameters,six working conditions of pure coal,various mixing ratios of biomass and various mixing models are studied.By analyzing the variation trend of velocity field,temperature field,flue gas component and NO in furnace in several working conditions,the most suitable combustion mode is determined to improve coal combustion efficiency and reduce the emission of pollutant NO.The results show that compared with pure coal combustion,the temperature in the main combustion zone of the furnace decreases after co-firing the cotton stalks,and the O2 content at the furnace outlet decreases.And the emission of NO declines with the increase of mixing ratio.In the comparison of mixing models,only firing cotton stalks in D layer is beneficial to reduce NO emission,which reduced by 15.2%compared with the mixing combustion condition.
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