减缓脱硫塔除雾器堵塞的流场优化方法OACSTPCD

[Objectives]Desulfurization tower mist eliminator is widely used in coal-fired power plants due to its simple structure and good fog removal effect.However,due to the limitation of its own gas-water separation principle,it is prone to scaling up and blocking on the plate surface,which seriously affects the output power of the unit.Therefore,it is necessary to solve the problem of frequent scaling and clogging of the wet desulfurization tower mist eliminator and the resulting excessive resistance loss.[Methods]The method of optimizing the flow field of desulfurization tower and its inlet flue using deflector plates was proposed,and the simulation calculations and engineering application verifications of the Z-shaped desulfurization tower and its L-shaped inlet flue before and after optimization were carried out.[Results]The simulation results indicate that under rated boiler load conditions,the relative standard deviation of the velocity at the outlet section of the L-shaped inlet flue decreases from 27.57%to 19.99%after optimization.The relative standard deviation of the velocity at the inlet section of the mist eliminator in the Z-shaped desulfurization tower decreases from 45.66%to 40.24%.Meanwhile,the mass flow rate of the slurry droplets at the mist eliminator inlet section drops from 441.136 kg/s to 368.498 kg/s,indicating that the optimization scheme effectively reduces the workload of the mist eliminator.Experimental results show that prior to the modification,there were regions with a velocity of 0 m/s at the mist eliminator inlet section,which are improved to a velocity of 1-5 m/s after the modification,consistent with the trends observed in the simulation.Data from 180 days of operation after the modification indicate that the pressure drop before and after the mist eliminator does not exceed 200 Pa.On-site measurement results during maintenance show that the scaling thickness on the mist eliminator plate is reduced from over 1 cm before the modification to about 0.1 cm,eliminating severe scaling and blockage phenomena.[Conclusions]The proposed flow field optimization method significantly improves the uniformity of the flue gas flow field in the desulfurization tower,reduces the workload of the mist eliminator,and effectively slows down the fouling problem of the mist eliminator,which has great engineering application value.