超细煤粉再燃的模拟计算与试验研究  

NUMERICAL SIMULATION AND EXPERIMENTAL STUDY ON MICRONIZED COAL REBURNING

作　　者：金晶[1] 张忠孝[1] 李瑞阳[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《中国电机工程学报》2004年第10期215-218,共4页Proceedings of the CSEE

基　　金：上海市教委发展基金项目(F20109)

摘　　要：超细煤粉再燃技术脱氮效率高而运行费用低,是最行之有效的低 NOx燃烧技术之一。通过模拟计算与试验方法,对一维热态煤粉炉内煤粉再燃,再燃区温度、过量空气系数、再燃燃料喷射速度和再燃燃料粒度对 NOx 还原率的影响规律进行了研究。研究结果表明:最佳再燃区温度为 1200℃;最佳再燃区过量空气系数为 0.9 左右;再燃燃料喷射速度越高,NOx还原率越高;再燃燃料越细,对 NOx的还原作用越强,最佳再燃燃料粒度为 20μm。与常规煤粉再燃相比,以超细煤粉作为再燃燃料,不仅对燃烧效率影响较小,而且对NOx 的还原效率也明显提高。Micronized coal reburning technology is one of the most promiseful methods, with high NOx reduction efficiency and low operation cost. The numerical simulation and experimental study on some influence factors such as the temperature and the stoichiometric ratio in rich zone, the velocity and the particle size of reburning fuel on NOx reduction efficient has been done. The results indicate that when the temperature is1200℃ and the stoichiometric ratio is about 0.9 in rich zone, the NOx reduction efficiency reaches the largest value. The larger reburning fuel velocity is, the higher NOx reduction efficiency is. NOx reduction efficiency increases with the reduction of particle size of reburning fuel. The optimum particle size of reburning fuel is 20μm. Compared with conventional coal reburning, micronized coal reburning on superior. This technology not only has less influence on combustion efficiency but also has higher NOx reduction efficiency.

关 键 词：煤粉再燃 过量空气系数 燃料喷射 燃料粒度 低NOX燃烧技术 超细煤粉 燃烧效率 脱氮效率 运行费用 试验研究 

分 类 号：TM621.2[电气工程—电力系统及自动化] TK227[动力工程及工程热物理—动力机械及工程]