A case analysis and treatment measures of high moisture content in wet desulphurization gypsum

Abstract China’s thermal power plant wet FGD (flue gas desulphurization) produces more than 80 million tons of gypsum each year. The factors affecting the quality desulphurization are limestone quality, flue dust, slurry pH, water content, system design features, and operating conditions, etc. There many reasons for high moisture analysis solution particularly complex. Through a case with content gypsum, main that unit has been under low load conditions long time sulphur coal, supply is high, pH volume crystals generated small, resulting in dehydration difficulty content. measures were to add crystal seeds into lower operation pH. improved, returns normal. margin large, even long-term operation. no similar cases, this situation generally does not attract attention. It worth further reference.