基于数值模拟对生物质循环流化床锅炉燃烧优化的研究  

Study on Optimization of Biomass Fuel Combustion in Circulating Fluidized Bed Based on Numerical Simulation

作　　者：江平 JIANG Ping(Guangdong Yuedian Yunhe Power Generation Co.,Ltd.,Yunfu Guangdong 527300,China)

机构地区：[1]广东粤电云河发电有限公司,广东云浮527300

出　　处：《湖北电力》2024年第3期141-146,共6页Hubei Electric Power

摘　　要：基于双流体模型对生物质燃料在循环流化床锅炉的燃烧过程开展模拟研究。模型中考虑固体燃料在炉膛内的干燥、热解和燃烧过程,并通过模拟结果调查下移燃料进口,减少屏式过热器受热面的面积,是否会影响烟气温度。通过对改变燃料进口位置的工况开展模拟研究,发现对于高水分燃料,可通过下移燃料进口,促使其提早干燥并燃烧,且有利于燃烧区整体下移,避免火焰直扫屏式过热器;而在减少屏式过热器的受热面后,烟气的平均温度略有上升,保证了屏式过热器的换热能力。模拟研究表明,合理改变燃烧区的燃烧组织形式,可以实现锅炉稳定运行及维持流化床锅炉热效率的主要因素。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 

分 类 号：TM621.2[电气工程—电力系统及自动化]