再燃燃料对煤粉燃尽特性的影响  

Effects of fuel upon burnout characteristics of micro-pulverized coal

作　　者：代纪邦[1] 金晶[1] 李立[1] 樊俊杰[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《上海理工大学学报》2007年第3期241-244,共4页Journal of University of Shanghai For Science and Technology

摘　　要：燃料分级燃烧低NOx技术采用超细煤粉作为再燃燃料,可解决由常规粒度煤粉作为再燃燃料而引起的未完全燃烧损失较大、NOx还原率低的问题.本文采用热天平和一维热态煤粉炉分别进行超细煤粉的燃烧特性机理和燃尽效果的热态模拟试验研究.试验研究表明,在确保再燃区停留时间和较高燃尽率的同时,对于停留时间为0.8 s左右的高挥发份的褐煤,30μm的粒径可实现较好的燃尽效果.采用低挥发份的煤种,需进一步减小粒度.Staged-combustion technique, incorporating micro-pulverised coal as rebuming fuel, can solve the problem resulting from coal of ordinary grading. Incomplete combustion loss can be reduced a lot. The combustion mechanism of micro-pulverised coal was experimentally investigated by use of themo-gravimetric balanoe, and numerical simulation was carried out for one-dimension fumaoe. The results show that for highvolatile lignite, particle diameter of 30 μm can lead to a better burnout result while residential time is 0.8 s. For coal having lower volatile content smaller size should be considered.

关 键 词：超细煤粉 再燃 燃尽特性 NOx 

分 类 号：TK16[动力工程及工程热物理—热能工程]