摘要
Abstract
This paper is based on the two-fluid model to make simulation and studies on the combustion process of biomass fuel in circulating fluidized bed boiler.In the model,the drying,pyrolysis and combustion processes of solid fuels in the furnace are considered,and the simulation results are used to investigate whether moving down the fuel inlet to reduce the heating surface area of the screen-type superheater will affect the flue gas temperature.Through the simulation study on the working condition of changing the fuel inlet position,it is found that as for high-moisture fuel,moving down the fuel inlet helps promote its earlier drying and combustion,conducive to the overall downward movement of the combustion zone to avoid the flame directly sweeping the screen-type superheater,and that after the heating surface of the screen-type superheater is reduced,the average temperature of the flue gas increases slightly,which ensures the heat transfer capacity of the screen-type superheater.The simulation results show that reasonable change of the combustion structure of the combustion zone can achieve the stable operation of the boiler and maintain the thermal efficiency of the fluidized bed boiler.关键词
循环流化床/燃烧组织/烟气温度/屏式过热器/生物质燃料Key words
circulating fluidized bed/combustion process/flue gas temperature/screen-type superheater/biomass fuel分类
信息技术与安全科学
