无烟煤恒温燃烧过程中NO和SO_2瞬态释放特性研究  

Research on NO and SO2 Release During the Combustion of Anthracite Coal

作　　者：孙青[1] 范卫东[1] 林正春[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《锅炉技术》2009年第3期1-4,26,共5页Boiler Technology

基　　金：国家高技术研究发展计划(863计划)课题(2006AA05Z321)

摘　　要：在高温一维卧式炉上,研究了阳泉无烟煤在富氧情况下恒温燃烧的NO、SO2等的瞬态释放特性。主要在1 000℃1、300℃、1 500℃3个温度等级下瞬态燃烧,在线测量了不同温度等级下的NO、SO2等释放特性以及计算了生成的NO中的氮和煤粉中的氮的比率。研究发现随着温度的升高,NO释放提前,NO释放过程缩短,NO释放峰值升高。随着温度的升高,生成的NO中的氮占煤粉中的氮的比率却下降。这主要由于温度高引起的更多的挥发分氮的迅速集中释放和局部高温低氧氛围更有利于NO的还原。即使是1 500℃,有热力型NO生成的情况下,NO生成量还是小于温度较低时的情况。SO2的生成过程滞后于NO,且生成量随温度上升而增加。Study on the release of NO and SO2 during the combustion of Yang Quan anthra cite coal at constant burner temperature was carried out on a one dimension horizontal burner. Three temperature of 1 000 ℃, 1 300 ℃ and 1 500 ℃ were used. Online measurements of concentration of NO and SO2 in the exiting gas were carried out as well as the calculation of ratio of nitrogen in NO to nitrogen in coal. It has been found that as temperature rises, the highest concentration of NO rises and it takes shorter time for NO formation and the full release of NO. While the ratio of nitrogen in NO produced to nitrogen in coal decreases as temperature raises even at 1 500 ℃ when there is thermal NO produced which may caused by the mass release of nitrogen in coal in atmosphere with high temperature and tow oxygen concentration where NO reduction is enhanced. The formation of SO2 comes after the formation of NO and the production of SO2 rises as temperature rises.

关 键 词：高温固定床 无烟煤 NO释放 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]