The Exhaust Gas Resource Utilization Of Power Station By Deep Desulfuration Technology

China is now being a country of coal-dominated structure by the perspective of energy resource condition.Approximately up to 80%coal adopt the way of direct combustion which is the criminal of many kinds of pollutions,i.e.,air pollution,water pollution et al.,produced some environment-unfriendly gas SO₂ very bad for our living condition.The discharge of this kind of gas is always a focus problem all over the world and limited under control.Comparison between Paste desulfurization technology and Ammonia wet desulfurization process,the later one contains a lot of advantages,i.e.,high desulfurization efficiency,easy utilization of by-products,no secondary pollution,low initial investment et al.,meeting the demands of environmental protection and now drawing an attention by people eyes increasingly.The paper investigated related mechanisms systemically in response to the increasing demand of Ammonia-based wet desulfurization process.Ammonia wet desulfurization process,which is able to get rid of part of oxynitride and sulfur efficiently within the exhaust gas,is now a kind of industrialized desulfurization technology divided into three following steps,desulfurization absorption,the process of semifinished product and the manufacture of by-product.Ammonia wet desulfurization process is a typical theoretical method adopting synthesis ammonia as desulfurization catalyst to conduct gas-phase reaction,with the feature of high SO2 absorption rate which can approximately reach up to the range of 95-99%.Besides,the technology is good enough to transfer exhaust-gas waste into something useful fertilizer,producing high value of by-product,desulfurizing in a high effective way,covering small area and possessing little apparatus resistence,as well as conducting desulfurization and denitration simultaneously without secondary pollution by gas,solid and liquid.The Ammonia-Ammonium Sulfate Fuel Gas Desulfurization?AASFGD?is a kind of technology allowing sulfur recycling,which is coincidence with China's sustainable development of economic policy achieving the purpose of cyclic development of the economy.The technology of AASFGD which is the most welcome one in Fuel Gas Desulfurization's?FGD?is still on the researching stage at present.In this paper,the combination of improved Marsuler process with wet ammonia method was used to make flue gas desulphurize as well as produce ammonium sulfate by-product.The simulation process,which can reach up to 99.8%SO2 absorption rate was completed by Aspen Plus simulation software,including three parts,i.e.,sulfur dioxide absorption and oxidation,separation and purification,drying,reached up to 99.99%the purity of product.The optimal solution has been obtained by the local optimized parameters in the process of establishing the whole process simulation model,i.e.,the number of plates in each absorber,reflux ratio,recovery rate,feed plate position and the amount of extraction agent.The reaction parameters are acquired in the paper based on further optimizing the best operation conditions recorded in references.In the paper,we conducted sensitivity analysis of the optimization parameters of the absorber?T0101?and continuous tank reactor?R0101?.By the same time,the a lot of parameters are optimized,containing the temperature of the crystallizer's?CR1001?incoming flue gas,the diameter of cyclone?HY2001?and centrifuge?CF2001?,the dosage and temperature of the air dryer?DR3001?,even the whole process of FGD by the results analysis.The optimization result about the technology of AASFGD in industrialization provides a little technological basis for further development.By optimizing the process parameters,the purity of the product was improved and the energy consumption was declined.