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Primary Research of a New Zero-Liquid-Discharge Technology of Wet Flue Gas Desulfurization Wastewater by Low-Rank Heat from Flue Gas

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  • Xuan Yao

    (State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
    China Energy Longyuan Environmental Protection Co. Ltd., Haidian District, Beijing 100039, China)

  • Man Zhang

    (State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Boyu Deng

    (State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Xinhua Yang

    (State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Hairui Yang

    (State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

Abstract

Wet flue gas desulfurization (WFGD) wastewater treatment is a key problem in coal-fired plants. Traditional chemical precipitation methods cannot reach zero-liquid discharge (ZLD). In this paper, a new technology using the low-rank heat from flue gas to concentrate the wastewater for ZLD is proposed. A scrubber was built to verify the concentrating process, and the characteristics of the concentrated water were analyzed. The concentrated water was neutralized by adding Ca(OH) 2 to raise the pH value. The wastewater can be concentrated 10~25 times to reduce the flow rate. The characteristics of the concentrated wastewater were studied by dosing lime. Then, liquid and solids were separated by filter pressing, the liquid was mainly composed of CaCl 2 , which accounts for 73.6%. The sludge is composed of CaSO 4 and Mg(OH) 2 , depending on the lime consumption of the dosing process. Finally, the filter liquor after the filter press was mixed with ash to reach zero liquid discharge, and the sludge could be burnt after mixing with the coal or disposed by third-part vendor. This technology is demonstrated in one 600 MW unit and shows a high system reliability. The clean water is recycled by the WFGD wastewater during the evaporation. Binding on the environmental policies and large market demand of the WFGD wastewater, this technology shows a great application prospect in the future.

Suggested Citation

  • Xuan Yao & Man Zhang & Boyu Deng & Xinhua Yang & Hairui Yang, 2021. "Primary Research of a New Zero-Liquid-Discharge Technology of Wet Flue Gas Desulfurization Wastewater by Low-Rank Heat from Flue Gas," Energies, MDPI, vol. 14(14), pages 1-9, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:14:p:4259-:d:594438
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    References listed on IDEAS

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    1. Li Yang & Yunfeng Ren & Zhihua Wang & Zhouming Hang & Yunxia Luo, 2021. "Simulation and Economic Research of Circulating Cooling Water Waste Heat and Water Resource Recovery System," Energies, MDPI, vol. 14(9), pages 1-13, April.
    2. Mariusz Tańczuk & Maciej Masiukiewicz & Stanisław Anweiler & Robert Junga, 2018. "Technical Aspects and Energy Effects of Waste Heat Recovery from District Heating Boiler Slag," Energies, MDPI, vol. 11(4), pages 1-19, March.
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    Cited by:

    1. Xinrui Guo & Jiangbo Wu & Xiaoze Du & Yaocong Zhang & Shuqin Feng & Shujun Liu, 2022. "Numerical Simulation of Multi-Nozzle Droplet Evaporation Characteristics for Desulfurization Wastewater," Energies, MDPI, vol. 15(14), pages 1-21, July.

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