Circulating pellet fluidized beds (CPFBs) are a highly efficient and environmentally friendly softening technology that can be used to reduce water hardness during the pretreatment process for circulating water in thermal power plants. The performance of chemical crystallization CPFB reactors was tested to increase the concentration ratio and soften the circulating water in a thermal power plant in Dingzhou, Hebei. The results show that using CFPB reactors can remove water hardness and Ca<sup>2+</sup> ions with efficiencies exceeding 60 % and 90 %, respectively. The size of the particles discharged from the reactors was approximately 1–3 mm. The CaO content in these particles was found to exceed 50 %. All of the discharged particles were reused in the desulfurization system in the power plant. After adopting the proposed CPFB technology 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 replenishing water and sewage discharges were both reduced by 150 m<sup>3</sup>/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, CFPB technology demonstrated a high hardness removal rate, strong economic benefits, and remarkable environmental and social benefits. Therefore, CFPB technology is ideal for softening replenished circulating cooling water, increasing the concentration ratio of circulating cooling water, and achieving zero liquid discharge (ZLD) in thermal power plants.

Application of chemical crystallization circulating pellet fluidized beds for softening and saving circulating water in thermal power plants

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.