| The important aspect of today’s lower atmospheric pollutant is SO2 super cleanemissions of coal-fired boiler which comes true. As environmental governance investmentof countries increasing,and more strict standard of the boiler flue gas SO2 emission,how totransform the existing desulfurization device, let it not only improved the desulfurizationefficiency, and reduced energy consumption, saving the cost of reform is a hot issue ofcurrent research.In this paper, one of the most widely used desulfurization technology of limestone-gypsum wet flue desulfurization technology was studied.And the article compared theperformance of the double dual cycle, increasing the height of desulfurization tower,increasing the number of tray, the new tower series-parallel and swirl atomizing method.Through the above research, this paper proposes the flue wet spraying pre-desulphurizationtechnology. The technology adopts the new type of efficient atomization nozzles. The nozzlearranged on the side of flue entrance desulfurization tower. The limestone slurry atomizes intomist, and premixes with smoke at the entrance of desulfurization tower.This paper using the Fluent software to simulate the smoke flow field after the technicaltransformation.Through the comparative analysis of smoke flow field of different location andangle,arrangemented atomization nozzle on the flue left and right sides at the same time, itseffect is better than that of spray nozzle arrangement on the other side.The horizontalinstallation angle is 15 °and the vertical installation angle is 80 °of flue atomizationnozzle, which flow field is better than other installation Angle.This paper used a power plant 100 MW unit with desulphurization system as an example,combined with the simulation results, which used the flue wet spraying pre-desulphurizationtechnology to transformation the system.A number of factors, including the liquid-gas ratio,the pressure of nebulizer, the temperature and the concentration of SO2 of inlet gas, theamount of oxide wind and p H value of slurry, on desulfurization efficiency were studied toobtain the optimum operating conditions for the technology. Results show that L/Q and thethe concentration of SO2 of inlet gas have a obvious influence on the desulfurizationefficiency.The desulfurization efficiency reaches the maximum, under these conditions of theamount of inlet gas being 460000Nm3/h, the temperature of inlet gas being 140 ℃,the volumeof flue nebulizer slurry being 160m3/h, the pressure of atomizing gas being 0.25 MPa and theslurry p H being 5.8.The desulfurization efficiency increased from 93.88% to 95.47% andincreased by 1.59%. At the same time,the performance of opened flue spray nozzle atoperated different spray layer was tested.The results showed that after opened flue spraynozzles, the less number of the spray layer was operated, the more obvious performance ofdesulfurization efficiency of the whole system.And when run only AD layer, desulfurizationefficiency maximum can be increased by 2.5%.Through the above research, the flue wet spray pre-desulferized technology under certainconditions, can be achieved for the reconstruction of the desulfurization system againexpansion efficiency, improve the efficiency of desulfurization.At the same time,it can use theoriginal equipment, reduce cost and energy consumption of desulfurization.The technologynot only can be associated with the above five ways of application, but also can be used innew desulfurization system, in order to improve the desulfurization efficiency of the wholesystem. |
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