Numerical Simulation on Semi-dry Deacidification of Flue Gas for Waste Incineration Power Plants

Taking the tail flue of a waste incineration power plant as an object, the heat and mass transfer model and chemical reaction model in the process of deacidification were established based on CPFD method, and the effects of stoichiometric ratio (SR), flue gas temperature and velocity, slurry particle size and concentration and HCl concentration on deacidification efficiency were analyzed. Results show that the semi-dry flue gas deacidification of waste power plant can greatly reduce the concentration of acid gas in flue gas. The deacidification efficiency increases with the rise of SR gradually, and the dechlorination efficiency is much higher than the desulfurization efficiency. When SR is same, with the increase of flue gas velocity, the dechlorination efficiency is almost unchanged, while the desulfurization efficiency decreases. The increase of flue gas temperature, slurry concentration and the decrease of HCl concentration will reduce deacidification efficiency. The deacidification efficiency first increases and then decreases with the increase of slurry particle size. When the slurry particle size is 50 μm, the desulfurization efficiency is the largest, and when the slurry particle size is 80 μm, the dechlorination efficiency is the largest.