| WFGD(Wet Flue Gas Desulfurization) is one of the most widely used technology for gas control in coal-fired power plant. But there there is still plenty of seriflux droplet in the flue gas after the desuffurization, which causing corrosion of the subsequent equipment GGH(Gas Gas Heater) and aerosol containing SO3 emissions into the air which causing environmental pollution. Therefore, defogging must be conducted to the WFGD. The two main performance indexes of the demister is the demisting efficiency and the system pressure drop.This paper used CFD software conducting numerical simulation on wave plate, barbed wave plate and circular tubed wave plate based on the data after desulfurization transforming in a power plant, worked out the demisting efficiency and the system pressure drop under,then analyzed the influences and reasons of different working conditions to them, finally put forward an optimized new kind of demister.The results shows that, the main factors which affect the demister system pressure drop is the inlet velocity, the plate spacing, and the plate type. The pressure drop along with the inlet velocity increases; Decreases with increasing plate spacing; Among three different type plate, the ascending order of pressure drop is wave plate, circular tubed wave plate and barbed wave plate. The main factors which affect the demisting efficiency added the droplet diameter.The demisting efficiency along with the droplet diameter and inlet velocity increases;Decreases with increasing plate spacing; Among three different type plate, the ascending order of demisting efficiency is barbed wave plate, circular tubed wave plate and wave plate.In addition, this paper designed a kind of demister with circular tube and smaller barb,which ensures the demisting efficiency were over 90% for most of the droplets, for part of the droplet the demisting efficiency reached 100%. Moreover, the pressure drop will not reach100 Pa. The study provided a reference to the optimal design of demister. |
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