在干法水泥生产技术中,分解炉内燃料燃烧和原料分解对水泥质量和污染物排放有重要影响。与燃料直接注入分解炉燃烧相比,燃料经循环流化床预热处理后再注入分解炉燃烧不仅可以提高分解炉内燃烧性能,减少有害气体排放,同时预热处理也可以增加水泥分解炉的燃料适应性。主要研究煤与生物质混合燃料在进入分解炉前由循环流化床预热后的预热特性,即不同因素对固相预热燃料和煤气的影响。研究表明:氧碳比(单位时间内O2与C的摩尔质量比)的增大会导致预热炉内反应和颗粒碰撞更为剧烈,导致预热燃料粒径减小;同时氧碳比增加会使煤和稻壳耦合预热产生的焦炭灰分增加,其他组分减少;外热源升温可明显提升CO、CH4、H2等煤气有效燃烧组分的生成,提高固相燃料中各组分的转化率。

In the dry cement production technology, fuel combustion and raw material decomposition in the calciner have important effectson cement quality and pollutant emission. Compared with the combustion of fuel directly injected into the calciner, the combustion performance of the fuel in the calciner can be improved and the emission of harmful gases can be reduced by the preheating treatment, andthe fuel adaptability of the cement calciner can be increased. The preheating characteristics of coal and biomass mixed fuel preheatedby circulating fluidized bed before entering the calciner was studied, that was, the influence of different factors on solid preheated fueland gas. The results show that the increase of oxygen-carbon ratio (molar mass ratio of O2 to C per unit time) will lead to more intense reaction and particle collision in preheating furnace, resulting in a decrease in the particle size of preheated fuel. At the same time, theash content of coke produced by coupling preheating of coal and rice husk increases and other components decrease with the increase of oxygen-carbon ratio. The heating of external heat source can significantly increase the generation of effective combustion components of gassuch as CO, CH4 and H2, and improve the conversion rate of each component in solid phase fuel.

0 引言

1 工艺流程及试验系统

2 结果与分析

   2.1 氧碳比对预热燃料性质的影响

   2.2 炉膛温度对预热燃料性质的影响

   2.3 预热处理对煤粉和稻壳颗粒微观性状的影响

3 结论