Application of Chemical Crystallization Circulating Pellet Fluidized Beds for Softening and Saving Circulating Water in Thermal Power Plants

Ruizhu Hu, Tinglin Huang, Tianwei Wang, Huixin Wang and Xiao Long
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Ruizhu Hu: Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi’an University of Architecture and Technology, Xi’an 710055, China
Tinglin Huang: Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi’an University of Architecture and Technology, Xi’an 710055, China
Tianwei Wang: Department of Production and Technology, Hebei Guohua Dingzhou Power Generation Co., Ltd., Dingzhou 070334, China
Huixin Wang: Department of Production and Technology, Hebei Guohua Dingzhou Power Generation Co., Ltd., Dingzhou 070334, China
Xiao Long: Department of Physical and Chemical Detection and Analysis Department, HEBEI Ji-Yan Energy Science and Technology Research Institute Co., Ltd., Shijiazhuang 050001, China

IJERPH, 2019, vol. 16, issue 22, 1-12

Abstract: The circulating pellet fluidized bed (CPFB) softening method is a highly efficient and environmentally friendly softening technology that can be used to reduce water hardness during the pretreatment process of circulating water in thermal power plants. The performance of chemical crystallization CPFB reactors was tested for increasing the concentration ratio and softening the circulating water in a thermal power plant in Dingzhou, Hebei. The results show that usage of CPFB reactors removed water hardness and Ca 2+ ions with efficiencies exceeding 60% and 90%, respectively. The size of the particles discharged from the reactors was approximately 1–3 mm, and the content of CaO in these particles was found to be greater than 50%. All the discharged particles were reused in the desulfurization system in the power plant. The operational cost of the CPFB system is US$0.074 per cubic meter of water. After adopting the proposed CPFB softening method in the Dingzhou Power Plant, the concentration ratio of the circulation cooling water was increased from 4.5 to more than 9. In addition, the amount of replenished water and sewage discharge were both reduced by 150 m 3 /h, and the amount of scale inhibitor used in the system was reduced by more than 30%. These improvements contribute to approximately US$200,000 in annual savings in the power plant. In summary, the CPFB softening method demonstrated a high hardness removal rate, strong economic benefits, and remarkable environmental and social benefits. Therefore, this method seems ideal for softening replenished circulating cooling water, increasing the concentration ratio of the water and achieving zero liquid discharge (ZLD) in thermal power plants.

Keywords: circulating pellet fluidized bed; thermal power plant; circulating cooling water; concentration ratio; zero liquid discharge (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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