Discussion on the cause of scaling in wet desulfurization system of large coal-fired power plants

2018 1st International Conference on Environment Prevention and Pollution Control Technology

生态环境科学

Deng, Yongqiang^1 ; Zou, Peng^2 ; Wu, Fayuan^1 ; Liu, Ping^1 ; Lin, Fuhai^1

Electric Power Research Institute of State Grid Jiangxi Electric Power Co., Ltd., Nanchang, Jiangxi Province

330096, China^1

China Power Hua Chuang Electricity Technology Research Co., Ltd., Jiangsu Province, Suzhou

215123, China^2

关键词: Coal-fired power plant;    Complex environments;    Desulfurized gypsums;    Flue gas desulfurization;    Scale composition;    Smelting reactions;    Stable operation;    Wet desulfurization;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/199/5/052021/pdf
DOI  :  10.1088/1755-1315/199/5/052021

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The flue gas desulfurization method of large coal-fired power plants is generally limestone/gypsum wet method. But many equipments of this wet desulfurization system during daily operation often cause scaling problems. At present, more literature think s this scale is caused by the mixing of desulfurized gypsum and fly ash in flue gas. However, this paper analyzes the scale composition and appearance of several power plants in China, which shows that the scale is not a simple mixture of gypsum and fly ash, and is a smelting reaction of fly ash in a complex environment and forms a hard scale of gypsum/limestone-fly ash gel. This kind of scale will endanger the safe and stable operation of the desulfurization system, specific operational and maintenance recommendations are proposed for reference.