Efficient Promotion Process And Mechanism Of Flue Gas Desulphurization In Coal

In recent years, the amount of SO2emission in coal has risen dramatically,causing severe damage to ecological environment in China. By the EnvironmentalProtection Department of Statistics, China’s total coal consumption is about3.7billiontons in2011, and22.179million tonnes of SO2are discharged into the atmosphere.Electric power and thermal power industry are the main sources of pollution. At present,most of the power plants built flue gas desulfurization facilitiesin represented bylimestone-gypsum Wet Flue Gas Desulfurization, which controlled the pollution of SO2effectively c. However, on one hand, supplies of coal is tight and the existingdesulfurization process with a sulphur content of coal than the design value has increaseddramatically, which maks the initial design of FGD system’s inadequate allowance forthe SO2processing power. As a result, the desulfurization efficiency is decreased and therequirements of environmental protection cannot be met; on the other hand, the nationalSO2emission limits are getting lower and lower, hence, the existing desulfurizationefficiency of flue gas desulfurization technology cannot meet national requirements.Improving the desulfurization efficiency has become the issues people focus on. Inresponse to this phenomenon, enlarging the existing desulfurization facilities is anecessary countermeasures, but investment and energy consumption are huge. Itscomplexity is the same with the new desulfurization systems. Therefore, a reasonableselection of additives to improve the efficiency of desulfurization system and reducinginvestment and running costs of desulfurization system become hot topics in the field ofWet Flue Gas Desulfurization.This article filters the eight desulfurization additive by bubbling reactor, andresearch the influences of experiment operating parameters to desulfurization efficiency,total reaction rate and gas phase total mass transfer coefficient under conditions of twokinds of additives. Besides, two kinds of desulfurization additive strengthendesulfurization mechanism are discussed. The results shows that inorganic salt A andtriethanolamine as desulfurization additive can strengthen the desulfurization efficiency,pH buffering capacity is the main cause of its desulfurization reinforcement, andadditives can improve the intrinsic reaction rate. When the inorganic salt A is taken asdesulfurization additive, the sulfur dioxide absorption of calcium carbonate is rapid response, intrinsic chemical reaction rate RAcontrol overall reaction speed in25to45degree Celsius, and when the temperature exceeded45degrees Celsius, Calciumcarbonate dissolution rate RBcontrol overall reaction speed. When the triethanolamine istaken as desulfurization additive, the sulfur dioxide absorption of calcium carbonate israpid response, intrinsic chemical reaction rate RAcontrol overall reaction speed in20to40degree Celsius, and when the temperature exceeded40degrees Celsius, The masstransfer rate of SO2RCcontrol overall reaction speed. The economy analysis of additiveshows that the300MW unit desulfurizing installations that using inorganic salt A asadditive can save about RMB1.93million a year; Using triethanolamine as additive cansave approximately about1.77million yuan a year.