电力科技与环保2024，Vol.40Issue(2)：133-141,9.DOI:10.19944/j.eptep.1674-8069.2024.02.005
一次风率对煤粉气流床气化-燃烧特性及NOx排放影响的试验研究
Experimental study on the gasification-combustion characteristics and nox emission characteristics of pulverized coal
摘要
Abstract
Coal powder gasification combustion technology is an important way to achieve ultra-low load stable combustion and low nitrogen oxide(NOx)emissions in coal-fired boilers.To determine the effect of primary wind speed(λ1)on the gasification combustion characteristics and NOx emissions of coal powder.A study was conducted on a self-built counterflow fluidised bed gasification combustion system λ.The reactivity and pore structure of the gasification semi-coke were analysed using a thermogravimetric analyser(TGA)and a chemical adsorption instrument to investigate the impact on the coal gasification characteristics,fuel nitrogen conversion and NOx emission characteristics.The results indicate that the increase of λ1 would increase the temperature of the gasifier,reducing the concentrations of CO and CH4 at the outlet of the gasifier by 2.67%and 2.43%,respectively;Promoted the conversion of fixed carbon,with a conversion rate increase of 17.28%;The conversion of fuel-N increased by 13.50%,with an increase in conversion to N2 but a decrease in conversion to NH3.Meanwhile,λ1 increasing the pore structure of gasification char resulted in a more developed pore structure,with an increase in specific surface area of 95.77 m2/g and a 2-fold increase in pore volume,which improved the combustion characteristics.After the gasified fuel enters the combustor,when λ exceeds 0.25,no NO is generated in the main combustion zone of the combustor.When λ1=0.35,the pollutant emissions at the combustor outlet are the lowest,with NOx and CO at 115.86 mg/Nm3(@6%O2)and 39.25 mg/Nm3(@6%O2),respectively;mean-while,the combustion efficiency is the highest,with the value of 99.68%.Therefore,primary air has a significant effect on the combustion characteristics and pollutant emissions of pulverised fuel gasification.By controlling an appropriate amount of primary air,pollutant emissions could be reduced while improving combustion efficiency.关键词
煤粉/气流床气化炉/气化燃烧/NOx排放特性Key words
Pulverized coal/Entrained-flow gasifier/Gasification-combustion/NOx emission Characteristics分类
能源科技引用本文复制引用
崔保崇,王肖肖,周必茂,谭厚章,熊小鹤..一次风率对煤粉气流床气化-燃烧特性及NOx排放影响的试验研究[J].电力科技与环保,2024,40(2):133-141,9.基金项目
中国自然科学青年基金项目(22008192) （22008192）
