The investigation of the coal ignition temperature in oxygen-enriched atmosphere by TGA
The oxygen-enriched Circulating fluidized bed (CFB) combustion technology is a new method to reduce CO2 emissions.The coal ignition temperature,Tj,in an oxygen-enriched CFB boiler is an important parameter for designing the startup burner and for choosing the operating strategy during the startup process.Comparing with the complicated operation in real oxygen-enriched CFB boiler or in a laboratory scale fluidized bed (FBR),thermo gravimetric analyzer is a more simple and convenient method to determine the Tj,because the TGA results would be related in some way with the field results.Thermo gravimetric analyses of seven different types of coal were operated in air and oxygen-enriched atmosphere (O2 40％,CO2 as balance gas),with three different heating rate(10k/min,20k/min,30k/min).It was found that the Ti,determined by the DTGA,decreased with the O2 concentration increasing.The coal with the higher volatile content had a lower ignition temperature.The influence of the heating rate on the Ti was relatively significant.With 40％ O2,the coal ignition temperatures firstly increased and then decreased with the increasing heating rate.Compared with the tests results obtained in a laboratory scale FB,the results obtained by these two methods have the same tendencies,and there must be a way to make the TGA results relative to the real coal ignition temperatures in the oxygen-enriched CFB boilers.
Oxygen-enriched ignition temperature TGA
Junnan CHAO Hairui YANG Yang CHEN Junfu LU Hai ZHANG Qing LIU
Key laboratory for Thermal Science and Power Engineering of ministry of Education Department of Theraml Engineering,Tsinghua University,Beijing 100084,China
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
400-403
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）