可再生能源2018，Vol.36Issue(6)：791-796,6.
某超超临界1000MW锅炉生物质与煤粉混烧数值模拟及优化
Numerical simulation and optimization of co-firing of coal and biomass for a 1000MW ultra-supercritical boiler
摘要
Abstract
The Computational Fluid Dynamics(CFD) software is employed to simulate numerically combustion process in a 1 000 MW Ultra -upercritical tower type tangential boiler. This paper analyzes temperature filed, burnout rate of fuel and Unburnt DPM concentration of furnace hopper with different co-firing ratio. The results of numerical simulation show that under the same condition of total input heat, the co-firing ratio increases without unapparent change of furnace temperature filed. DPM concentration of furnace outlet with co-firing of coal and biomass are lower than only coal combustion. With the co-firing ratio is 20%, average CO volume fraction of furnace outlet is 0.06%, DPM concentration of furnace outlet is 0.002 kg/m3 and boiler efficiency increases. Unburnt DPM concentration of furnace hopper increases with co-firing ratio increasing, because secondary air mass flowes at the bottom reduces. When the co-firing ratio is 20%, unburnt DPM concentration of furnace hopper is 12 times of the single coal combustion. For solving the problem of excessively great unburnt DPM concentration of furnace hopper with high co-firing ratio. The paper provides two optimization schemes. One optimization scheme is putting all biomass in the top two coal pulverizing systems. Another optimization scheme is that secondary air will increase the total air volume of 5% to the bottom of the burner. Two optimization schemes could reduce the unburnt DPM concentration of furnace hopper more than 85%.关键词
生物质/煤/混烧/数值模拟/优化设计Key words
biomass/ coal/ co-firing/ numerical simulation/ optimization scheme分类
能源科技引用本文复制引用
吕洪坤,齐晓娟,童家麟,丁历威,李剑,叶学民..某超超临界1000MW锅炉生物质与煤粉混烧数值模拟及优化[J].可再生能源,2018,36(6):791-796,6.基金项目
教育部中央高校专项基金项目(13MS98). （13MS98）
