Research Of Sulfur Dioxide Desorption Characteristics From Basic Aluminum Sulfate Desulfurization Ricb Liquid

Basic aluminum sulfate desorption is using basic aluminum sulfate solution as anabsorbent, to remove low concentrations of SO2from thermal power plant flue gas, thenthe rich liquid is heated to desorption, released high concentration of SO2gas, poor liquidafter desorption continues to cycle desulfurization. Compared with the conventionallimestone-gypsum wet flue gas desulfurization process, basic aluminum sulfatedesorption has advantages such as recyclable, high desulfurization efficiency, smallliquid-gas ratio.Built a bubbling absorption unit and a desulfurization rich liquid water bathdesorption unit and a microwave-assisted desorption unit, with basic aluminum sulfatedesulfurization rich liquid as the main object, studied experimentally and analyzedtheoretically to basic aluminum sulfate desulfurization rich liquid desorptioncharacteristics under different desorption conditions:(1) Analyzed the influence law ofalkalinity, aluminum volume, SO2absorption amount (ventilation), desorption time andoxygen suppression agent on the desorption rate, oxidation rate, desorption speed rate andother factors of the solution;(2) Analyzed problem of desorption rate drop duringdesulfurizer recycling process, to get the best cycle absorption and desorption parametersof the program;(3) Compared and got desorption characteristics of water, basic aluminumsulfate desulfurization rich liquid, desulfurization rich liquid with oxygen suppressionagent three absorbers under the desorption conditions of water bath and microwave.The results show that: Under the desorption condition of water bath at80℃, basicaluminum sulfate desulfurization rich liquid desorption rate is up to80%after75min, withthe increased of desulfurizer cycle times, desorption rate has declined at the same timenode, however, after5cycles, the maximum desorption rate is still more than70%,desorption favorable. Under the condition of water bath and microwave successively effect,use microwave-assisted effect when water bath desorption reach the end, desorption ratecan be further increased by about5%, eventually reach a new desorption end. While onlyuse microwave effect desorption, desorption rate at the end is10%higher than water bathdesorption, the desorption rate is about35times than water bath desorption condition,power consumption at the end is1/10of water bath desorption. It is showed thatmicrowave irradiation can not only promote the desorption reaction depth, also can increase the desorption reaction rate, shorten the reaction time, reduce the desorptionpower consumption, at the same time, the oxidation rate decreased significantly because ofincreasing of the reaction rate.