Abstract
Focusing on the phenomenon of gypsum rain while wet desulphurization(WFGD) were adopted in coal fired power plant without GGH, the paper studied and put forward the solutions : (1) desulfurization facilities related equipment modification; (2) optimal operation of existing desulfurization facilities.
Highlights
We have already completed the inspection of desulfurization units of coal-fired power plants with 14.24 million kilowatts
The Desulfurization units are mainly based on limestone/gypsum wet FGD, only 8 sets are installed GGH, which accounts for 15% of total capacity
For adverse weather conditions like low temperature and low pressure, the gas will form condensed into drops when leaving chimney, falling down to the ground around the chimney like rain, leaving solid white residues after landing and polluting the surrounding environment of power plant
Summary
We have already completed the inspection of desulfurization units of coal-fired power plants with 14.24 million kilowatts (about 96% of the total capacity of installed coal-fired units). The Desulfurization units are mainly based on limestone/gypsum wet FGD, only 8 sets are installed GGH, which accounts for 15% of total capacity. The desulphurization system without GGH has a lower exhaust temperature because of the lack of stack reheating measures, so that flue gas cannot quickly dissipate, going with the inefficient uplift and spread, resulted by the net smoke with saturated water of absorption tower export partly condensing to form droplets in the discharge process. For adverse weather conditions like low temperature and low pressure, the gas will form condensed into drops when leaving chimney, falling down to the ground around the chimney like rain, leaving solid white residues after landing and polluting the surrounding environment of power plant.
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