摘要
超细煤粉再燃技术脱氮效率高而运行费用低 ,是最有发展前途的低NOx 燃烧技术之一 .利用试验方法 ,研究了超细煤粉再燃技术中各主要因素对NOx 排放的影响 ,得出如下结论 :再燃区过量空气系数存在一个最佳值 ,约为 0 .85 ;在温度小于 1 2 0 0℃范围内 ,再燃区内温度越高 ,NOx 的还原率越高 ;提高再燃区停留时间有利于降低NOx的排放 ,但停留时间进一步增加 ,其影响趋势趋于平缓 ,本试验条件下再燃区内的最佳停留时间为 0 6 3s左右 ;同常规粒度煤粉再燃相比 ,使用超细煤粉作为再燃燃料 ,NOx 脱除率明显提高 ,达到 70 %左右 .
Micronized coal reburning (MCR) technology is one of the most promiseful methods, with high NO_x reduction efficiency and low operating cost. The influence factors of NO_x emission of MCR technology has been investigated experimentally, with the results indicating that the optimum value for stoichiometric ratio of reburning zone is about 0.85. In the temperature range of lower than 1?200?℃, the higher temperature of reburning zone is, the higher NO_x reduction efficiency is. It is propitious for reducing NO_x emissions, with the residence time in reburning zone increasing, but the effect is not obvious with the residence time further increasing, and the optimum value is around 0.63?s. Compared with conventional pulverized coal reburning, MCR is superior in further reducing NO_x emissions, reaching about 70%.
出处
《山东大学学报（工学版）》
CAS
2004年第5期26-29,共4页
Journal of Shandong University（Engineering Science）
基金
上海市教委发展基金资助项目 (0 2GK0 8)
