Study on optimization of spray system for spray tower recovering waste heat within flue gas
For the problem of the flue gas flow deviation in the spray tower which affects the heat and mass exchange of the flue gas and falling liquid droplets,a theoretical model for gas-liquid flow and waste heat recovery in the spray tower was constructed,and some relevant experiments were verified.Based on the self-adjustment effect of liquid droplets,CFD technology was used to simulate the performance of the spray tower with four spray layer arrangements to obtain the best spray solution and its spray parameters.The results indicate that compared to the conventional single-layer uniform spraying method,the addition of half-layer spraying can effectively improve the uniformity of flue gas flow in the tower,the uniformity of flue gas in the tower is reduced from 1 to 0.3,and the total heat exchange efficiency of the spray tower can be improved by 20%.The best location for the half-layer spraying is 3 m above the center line of the flue gas inlet.By comprehensively considering the waste heat recovery effect and operating costs,the optimum spray droplet diameter is 0.6 mm to 0.8 mm and the optimum water to gas ratio is 5 kg/kg.The heat recovery model for flue gas in the spray tower and the proposed spray optimization method constructed can provide theoretical guidance for its characteristics analysis,process optimization,parameter design and operation.
waste heat recoveryspray towerflow field uniformitynumerical simulation
万方数据
维普
