EXPERIMENTAL STUDY ON NITRIC OXIDE REDUCTION BY GASEOUS FUEL REBURNING
The reburning technology, especially using the natural gas or methane as the reburn fuel considered to be one of the most promising and cost-effective NOx reduction strategies for coal combustion boiler. An experimental study on gaseous fuel reburning has been performed in a drop tube furnace in this study and a wide range of coal qualities including five Chinese coals were used as the primary fuel. The influence of the key factors on NO reduction efficiency by gaseous fuel reburning was analyzed. The results of the experiments show that the appropriate amount of gaseous reburn fuel is about 10％～15％ of the total thermal input, the reasonable residence time in reburn zone is about 0.6s～0.9s, and the optimized average excess air coefficient for reburn zone is about 0.8～0.9. Above 50％ NO reduction can be achieved under that optimizational reburn conditions. It is found that a larger NO reduction efficiency can be obtained by gaseous fuel reburning when the higher volatile content is contained in the coal. During the experiments, the temperature of reburn zone did not exceed 1500K in order to reduce the production of thermal-NOx. It is expected that the results of this study provide a basis for further studies on reburning technology.
Reburning Nitric ozide Coal combustion
Sheng SU Lushi SUN Jun XIANG Song HU Jinming SHI Yi WANG
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, Peoples Republic of China
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
294-299
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）