电力科技与环保2024，Vol.40Issue(4)：397-406,10.DOI:10.19944/j.eptep.1674-8069.2024.04.008
全回路CFB中一级燃料配比对异重燃料分级燃烧影响的模拟
Simulation of the effect of first-order fuels ratios on fuels-staged combustion of fuels with different specific gravities in a full-loop CFB
摘要
Abstract
Circulating fluidized bed (CFB) is used as the preferred equipment for the thermal utilization of low calorific value solid waste because of its wide range of fuel application. In order to solve the problem of difficult control of pollution caused by improper fuel ratio in circulating fluidized bed combustion of heavy mixed fuel,soft coal gangue (SCG) particles and refuse derived fuel (RDF) particles were used as heavy fuel in this paper. The flow,temperature and gas composition distribution of three different primary fuel ratios in the staged combustion process of circulating fluidized bed boiler were simulated by Euler two-flow model using staged combustion technology,so as to obtain the best primary fuel ratio for staged combustion in circulating fluidized bed. The results show that:The ratio of SCG/RDF of 5/2 can promote the collision frequency between particles and fluid and increase the pyrolysis reaction intensity of volatiles in HCG.Under this ratio,the reaction rate of volatiles in the dense phase region is 0.025 and 0.01 higher than that of SCG/RDF of 6/1 and 3/4,respectively. At the same time,the overall furnace temperature of this ratio is 175 K and 25 K higher than that of SCG/RDF at 6/1 and 3/4,respectively,which achieves the best effect of fuel co-combustion. The O2 consumption at this ratio is 0.08 and 0.01 higher than that of SCG/RDF at 6/1 and 3/4,respectively. In addition,the increase of RDF ratio will reduce the content of pollutants NO and SO2. Therefore,when the ratio of SCG/RDF is 5/2,the optimal operation state of staged combustion of heavy fuel can be achieved,and the circulating fluidized bed combustion effect of heavy fuel is the best.关键词
煤矸石/垃圾衍生燃料/异重燃料/CFD数值模拟/全回路循环流化床Key words
coal gangue/refuse derived fuel/different specific gravities fuel/CFD numerical simulation/full-loop circulating fluidized bed分类
能源科技引用本文复制引用
王瑞晨,周全..全回路CFB中一级燃料配比对异重燃料分级燃烧影响的模拟[J].电力科技与环保,2024,40(4):397-406,10.基金项目
国家重点研发计划项目(2019YFC1903902) （2019YFC1903902）
辽宁省科技厅"揭榜挂帅"科技攻关专项(2023JH1/10400006) （2023JH1/10400006）
