THERMAL CALCULATION ON A 300MW COAL FIRED BOILER WITH O2/CO2 COMBUSTION
Generation of electricity of which coal is the main fuel emits about 25％ CO2 of the total caused by the human activity and that is the biggest resources of CO2 release. The O2/CO2 combustion technology can control the emission of CO2, SO2 and NOx, and is a very promising clean coal combustion technology. Based on an existing unit in North China, the thermal calculation of a 300MW boiler combustion in O2/CO2 has been carried, which involves the calculation of coal adiabatic combustion temperature, boiler heat balance, design and checking calculation of furnace and convection pass. The calculation shows that when O2 concentration is 30％ in the oxidant, the furnace gas temperature is higher than combustion with air to some extent, the heating surfaces should be retrofitted with the aim of operation safety. To avoid slagging, the furnace exhaust temperature is determinated as 1200℃ and the furnace will be taller. Besides water cooled wall there is surperheating and reheating surface in the furnace, therefore, in the convection pass there will be smaller surface needed. Except that the economizer is equivalent to the conventional boiler, the other convection surfaces all reduce, and the reheater even decreases to 5.4％. The study shows the feasibility of O2/CO2 combustion of coal fired boiler in power plant, and calculation results may be the reference of boiler designing.
unit boiler O2/CO2 combustion thermal calculation CO2 capture
Xiujun LIANG Weiping YAN Yanfeng LIU
Power Engineering Department, North China Electric Power University, Baoding, 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
823-827
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）