Investigation of a High Pressure Oxy-coal Process
A study was conducted to investigate the feasibility of an oxy-coal process,which is pressurized to a combustion pressure of 80 bar.At that pressure the water-vapor can be separated economically from the CO2/H2O flue gases,either by nucleate condensation or by condensation on cooled surfaces in condenser heat exchangers at a temperature of about 300°C.The heat of condensation can be recaptured to preheat the boiler feed water.So the number of economizers is drastically reduced compared to a conventional steam cycle.Another interesting feature of the high pressure oxy-coal process is the fact,that low rank coal with high moisture content can be fired.Such a process at a pressure of about 80 bar is currently investigated by Babcock,USA,as the ThermoEnergy Integrated Power System (TIPS) and will be analyzed in the present paper.A known disadvantage of the oxy-coal processes is the large recirculating flue gas stream to control the combustion temperature,and which need large pipes and heavy recirculation fans.This disadvantage could be avoided if instead of flue gas a part of the condensed water from the condenser heat exchangers is recirculated. Within the present study both types of processes have been simulated and for an electric power output of about 220 MW.Furthermore,results of CFD simulations of a pressurized 250 MW combustor with a single swirl burner and flue gas recirculation will be presented.
Oxy-coal process High pressure combustion withO2/CO2/H2O mixtures Process simulation CFD swirl burner simulation
U.Renz
Institute of Heat and Mass Transfer,RWTH Aachen University,Aachen,Germany
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
91-98
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）