Dynamics Simulations Of Desulfurization And Denitrification Process Pressurized Of Flue Gas From Oxy-fuel Combustion

Oxy-fuel combustion is suggested as the possible, promising technology for capturingCO2from coal-fired power plants, combined with the characteristic of compressing toliquefaction before utilization or sequestration of flue gas from oxy-fuel combustion,compression process is used for the simultaneous desulfurization and denitrification cangreatly reduce the cost of flue gas purification. Therefore, it’s great significance of theoryand practice for industrial application of oxy-fuel combustion technology to study thesimultaneous desulfurization and denitrification of flue gas from oxy-fuel combustion.In this paper, I firstly based pressured denitration simulation process of Aspen Plus onthe experimental results, systematic analysis the effect of the pressure, temperature, initialO2concentration and initial NO concentration on pressurized denitrification process, andoptimization analysis was done for the denitrification process. Then, the pressureddesulfurization and denitrification experiments under different pressure and temperature aredone in the autoclave which is used to do pressurized denitrification experiments, anddesign simultaneous desulfurization and denitrification processes for industrial application，which is simulated by Aspen Plus，systematic analysis the effect of Various parameters onsimultaneous desulfurization and denitrification process.The result of pressured denitrification process simulation shows: removal ratio of NOis increased gradually with increasing pressure, initial O2concentration and initial NOconcentration and decreasing temperature, and the presence of N2in the flue gas is notconducive to pressurized denitrification process, only part of NO can be removed duringbooster process, in order to make the removal ratio of NO meet the industrial requirements,we must ensure sufficient residence time. The result of optimization analysis of thedenitrification process shows that26bar and30℃is suitable for pressurizeddenitrification of flue gas from oxy-fuel combustion.The result of pressured simultaneous desulfurization and denitrification experimentsshows: SO2are completely absorbed in each condition, removal ratio of NO is increasedgradually with increasing pressure and decreasing temperature, Changes of pressure andtemperature affect not only the oxidation rate but also gas-liquid mass transfer rate, and the presence of SO2is not conducive to NO removal. Then we design simultaneousdesulfurization and denitrification processes for industrial application and bases simulationusing Aspen Plus on Calculated of an oxy-fuel boiler，the result shows that it can reachesdesulfurization ratio of100%and the denitration ratio of98.3%, Changing the simulationprocessing conditions, we found that removal ratio of SO2and NO are all increasedgradually with increasing pressure and decreasing temperature, SO2removal reactionmainly concentrated at the beginning of the simultaneous desulfurization and denitrificationprocess, and NO removal reaction exists in the whole process, the removal ratio of NO isobvious affected in flue gas of high SO2concentration.