Abstract
Desulfurization wastewater has the characteristics of small discharge and high pollution, and must be strictly treated. To obtain the main factors affecting the evaporation characteristics of desulfurization wastewater in boiler flue, a 600MW unit of a coal-fired power plant in China was taken as an example. According to the theory of fluid mechanics and heat transfer, the numerical simulation method was used. The results show that the way the nozzle is installed on the upper wall of the flue inlet can enhance the evaporation effect of the desulfurization wastewater. It is also revealed that the influence of the flue gas flow rate on the droplet evaporation effect is relatively small. The smaller droplet diameter and the higher flue gas inlet temperature will obviously enhance the evaporation effect of the droplets in the flue. However these two factors will increase the operating cost and reduce the boiler thermal efficiency. Therefore, the values of the droplet diameter and the flue gas inlet temperature need to be further determined by technical and economic comparison.
Highlights
Limestone-gypsum wet desulfurization processing has the advantages of high desulfurization efficiency and high technical maturity
In the numerical simulation, the calculation parameters are set such that the average diameter of the droplets is 60 μm to 90 μm, respectively, and the values are taken at intervals of 5 μm; the inlet temperature of the flue gas is 140°C to 180°C, respectively, and the values are taken at intervals of 10°C; The flow rates are 8 m/s to 12 m/s, respectively, and the values are taken at intervals of 1 m/s
The nozzle installation positions are respectively at the upper wall surface and the lower wall surface of the tail flue inlet section, and the desulfurization wastewater is sprayed in both installation positions
Summary
Limestone-gypsum wet desulfurization processing has the advantages of high desulfurization efficiency and high technical maturity It was widely used in coal-fired power plants around the world. The discharge of desulfurization wastewater is not large, due to its special water quality characteristics, it must be strictly treated, otherwise it will have a serious impact on the surrounding environment of the power plant. In the current technology for treating desulfurization wastewater, the flue evaporation method has the advantages of the simple system and small secondary pollution[6,7,8]. To obtain the main factors affecting the evaporation characteristics of desulfurization wastewater in boiler flue, this paper takes a 600MW unit of a coal-fired power plant in China as an example and uses numerical simulation method to study. The conclusions obtained provide a reference for the engineering application of flue gas evaporation mode of desulfurization wastewater
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