华电技术 ›› 2013, Vol. 35 ›› Issue (12): 73-76.

• 新能源 • 上一篇    下一篇

生物质与煤共燃对循环流化床锅炉燃烧排放物的影响

  

  1. (华电郑州机械设计研究院有限公司,河南郑州〓450015)
  • 出版日期:2013-12-25

Influence of cocombustion of coal and biomass on combustion emissions of circulating fluidized bed boiler

  1. (Huadian Zhengzhou Mechanical Design Institute Company Limited, Zhengzhou 450015, China)
  • Published:2013-12-25

摘要:

摘要:利用Aspen Plus建立生物质与煤在循环流化床锅炉共燃的模型,在不同掺烧比例、燃烧温度、含水率、空燃比条件下,研究了生物质与煤混合燃烧时燃烧产物的排放规律。结果表明,燃烧产物NO,NO2,SO2,CO,CO2的排放量均随生物质水分的增加而减少,而SO3,H2O随生物质水分的增加而增加;燃烧温度随空燃比的增加呈现先升高后降低的趋势,在空燃比值为6时燃烧温度最高;不同温度下,硫释放特性有较大的差别,SO2的体积分数随温度的升高而单调减少,NO的体积分数随温度的升高先增加后减小;随着掺烧比例的增加,SO2及NO的排放量呈下降趋势。

关键词: 关键词:煤, 生物质, 共燃, 空燃比, 燃烧温度, 污染物

Abstract:

Abstract:Using the software Aspen Plus, a cocombustion model of biomass and coal in circulating fluidized bed boiler was established. The law of cocombustion emission of biomass and coal under different conditions of the biomasscoal blended ratio, the combustion temperature, the moisture content of the biomass and the airfuel ratio was studied. The results are as follows: Along with increase of the moisture content of biomass, the emissions of combustion produced NO,NO2,SO2,CO and CO2 decrease, and the emissions of SO3 and H2O increase. Along with increase of airfuel ratio, the combustion temperature rises firstly and then falls, and the combustion temperature is highest when the airfuel ratio is 6. Under different combustion temperature, sulfur discharge characteristics are different. The volume fraction of SO2 decreases monotonically when the temperature is rising, and along with increase of the temperature, the volume fraction of NO increases firstly, and then decreases. Along with increase of biomass blended ratio, the emissions of SO2 and NO decrease.

Key words: Key words:coal, biomass, cocombustion, airfuel ratio, combustion temperature, pollutant