某600MW煤粉锅炉掺混污泥NO_(x)排放特性数值模拟研究  

Numerical Simulation on NO Emission Characteristics of Pulverized Coal with Sludge in a 600MW Coal-fired Boiler

作　　者：李凡[1] 赵小盼 乔晓磊[1] 金燕[1] LI Fan;ZHAO Xiao-pan;QIAO Xiao-lei(Taiyuan University of Technology)

机构地区：[1]太原理工大学,山西太原030024

出　　处：《电站系统工程》2021年第4期7-11,共5页Power System Engineering

基　　金：国家自然基金(U1910214)资助。

摘　　要：采用Fluent软件,使用涡耗散模型(EDM)对某600 MW四角切圆煤粉锅炉单独燃烧煤粉、煤粉和污泥混烧工况进行数值模拟研究。结果表明:模型能够较好地模拟锅炉燃烧,出口烟气误差在10%以内,掺混污泥后,炉内烟气速度场变化较小,炉膛整体温度下降。随着含水率的增加,炉膛出口温度降低,NOx排放升高,含水率40%工况比含水率10%工况NOx排放增加5%。随着掺混比例增加,炉膛出口温度降低,NOx排放下降,40%含水率下,与单独燃烧煤粉相比,10%掺混比例炉膛出口平均温度降低18.1 K,出口NOx排放降低10.8%,实际运行中掺混质量分数为10%,含水率为40%的污泥是可行的。Using Fluent software and eddy-dissipation model(EDM), the numerical simulation research was carried out on the combustion conditions of pulverized coal, pulverized coal and sludge mixed burning in a 600 MW tangential-fired pulverized coal boiler. The results show that Model can reasonably simulate the boiler combustion and flue gas error at the outlet is within 10%. After mixing the sludge, the flue gas velocity field in the furnace changes little, and the overall temperature of the furnace decreases. With the increase of moisture content, the furnace outlet temperature decreases and NOx emission increases, NOx emission concentration at 40% moisture content increases by 5.0% compared with that at 10% moisture content, with the increase of blending ratio, furnace outlet temperature is reduced, NOx emissions reduce.Compared with burning pulverized coal alone, the average temperature at the outlet of the furnace with 10% mixing ratio is reduced by 18.1 K, and NOx emission at the outlet is reduced by 10.8%. It is feasible to mix sludge with 10% mass fraction and 40% moisture content in actual operation.

关 键 词：煤粉 污泥 掺烧 数值模拟 NOX排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]