Case Analysis and Solutions of Gypsum Dewatering for FGD Systems of Power Plants

doi:10.11930/j.issn.1004-9649.2013.1.99.3

Abstract

Abstract: Based on the case of the lime/gypsum wet flue gas desulfurization(WFGD) system for the 3×75 t/h circulating fluidized bed boiler in the cogeneration power plant of Shanxi Datuhe Coking and Chemical Co., Ltd., the main causes for abnormal gypsum dewatering which leads to abnormal operation of the system are determined quickly and accurately by using the qualitative analysis method according to the color, setting and separation of the slurry and the appearance of the dewatered slurry filter cake, including the high fly ash content, high CaSO₃·1/2H₂O content and high dissolved calcium hydroxide content in the slurry. By lowering the fly ash content, dredging the oxidation air pipeline, adding gypsum seed and timely adjusting the operation condition, the problem is solved, which indicates that the qualitative analysis method is suitable for emergency treatment of WFGD systems.

Key words: WFGD, gypsum dewatering, fly ash, CaSO3·1/2H2O, Ca(OH)2, CaSO4·2H2O

CLC Number:

X701

LIANG Lei. Case Analysis and Solutions of Gypsum Dewatering for FGD Systems of Power Plants[J]. Electric Power, 2013, 46(1): 99-102.

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https://www.electricpower.com.cn/EN/Y2013/V46/I1/99

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