| The greenhouse effect is considered to be the primary reason of climate change,for which most countries make reduction plans to control the emission of carbondioxide. China's energy consumption mainly depends on coal and about three billiontons of coal every year nowadays. Therefore to reduce the carbon dioxide emissionduring the process of coal combustion is very important to accomplish the reductionplans. About half amount of the coal consumed are used for power generation andpower plant boilers are the stable emission resources for carbon dioxide. So that to cutthe carbon dioxide emission from coal-fired power plant is effective method. Oxyfuelcombustion combustion technology is one of the promising methods to solve theproblems.Existing boilers have potential to use the oxy-fuel technique after retrofit,toinvestigate the feasibility of the Oxy-fuel combustion in power station is veryimportant. This paper studied a 300MW subcritical tangentially firedboiler.Experimental studies are carried out firstly to investigate the combustioncharacteristic on the condition of Oxy-fuel combustion in ord to guide the design ofoxygen-enriched condition. Suitable models for turbulent flow, combustion, heattransfer and especially gas radiation model in furnace are selected,these models arechosen or modified based FLUENT. With changing the oxygen concentration, inletair amount and air distribution. Combustion characteristics of pulverized coal on theoxygen-enriched condition and heat exchange discipline in furnace can be obtained,Analysing the problem brought in ,advises were given for the future use of oxy-fuelcombustion technique.
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