A Heat And Moisture Transfer Analysis Of Lime Wet Flue Gas Desulfurization Technology

Through many years of development, the lime wet flue gas desulfurization (WFGD) technology has made a rapid progress. But by the investigation about so many WFGD writings, it finds that the research is emphasized more on the chemistry reaction between SO₂ and lime absorbent solution and less on the heat and moisture transfer to study the operating parameters.For making up the shortage of this study, firstly, this text makes sure the main influence factors of WFGD through analysis of general desulfurization mechanism, then establishes the experiment model, carryes on the experiment on the variety of absorbent solution pH value , liquid-air ratio , absorbent solution temperature, SO₂ concentration of inlet flue gas, records theexperimental data, and analyses the influence of heat and moisture and substance transfer, handles with the data, fits and optimizes the formula according to lsqnonlin function, and establishes WFGD model based on the theory and optimizing formula by Simulink toolbox. That model includes two subsystems: desulflirization efficiency, heat and moisture transfer. We can change the import data (flue gas volume flow, SO2 concentration of inlet flue gas, absorbent solution volume flow, absorbent solution temperature in flume, absorbent solution pH value in flume, outdoor air dry and wet-bulb temperature) to simulate the influence of heat and moisture transfer, and to obtain the export data (desulflirization efficiency, condensate or not, SO2 concentration of outlet flue gas reach the standard or not, unit water consumption, water fume remove ratio) variety. Finally, it proves the model is correct by another experiment data and can be used to simulate this WFGD model.So this text puts forward a very easy and useful method, it can predict the desulflirization effect and other parameters variety when practical operating condition is scarce, and can selectappropriated operating parameters to reduce investment cost and save operating expenditure and reach predicted purpose in practical operating.