IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v14y2021i14p4259-d594438.html
   My bibliography  Save this article

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

Author

Listed:
  • 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
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/14/14/4259/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/14/14/4259/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    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.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    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.

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Junga, Robert & Pospolita, Janusz & Niemiec, Patrycja, 2020. "Combustion and grindability characteristics of palm kernel shells torrefied in a pilot-scale installation," Renewable Energy, Elsevier, vol. 147(P1), pages 1239-1250.
    2. Soheil Kavian & Mohsen Saffari Pour & Ali Hakkaki-Fard, 2019. "Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection," Energies, MDPI, vol. 12(9), pages 1-30, May.
    3. Darko Goričanec & Igor Ivanovski & Jurij Krope & Danijela Urbancl, 2020. "The Exploitation of Low-Temperature Hot Water Boiler Sources with High-Temperature Heat Pump Integration," Energies, MDPI, vol. 13(23), pages 1-12, November.
    4. Mariusz Tańczuk & Robert Junga & Alicja Kolasa-Więcek & Patrycja Niemiec, 2019. "Assessment of the Energy Potential of Chicken Manure in Poland," Energies, MDPI, vol. 12(7), pages 1-18, April.
    5. Stanislav Boldyryev & Mariia Ilchenko & Goran Krajačić, 2024. "Improving the Economic Efficiency of Heat Pump Integration into Distillation Columns of Process Plants Applying Different Pressures of Evaporators and Condensers," Energies, MDPI, vol. 17(4), pages 1-33, February.
    6. Francesco Calise & Mário Costa & Qiuwang Wang & Xiliang Zhang & Neven Duić, 2018. "Recent Advances in the Analysis of Sustainable Energy Systems," Energies, MDPI, vol. 11(10), pages 1-30, September.
    7. Rima Aridi & Jalal Faraj & Samer Ali & Mostafa Gad El-Rab & Thierry Lemenand & Mahmoud Khaled, 2021. "Energy Recovery in Air Conditioning Systems: Comprehensive Review, Classifications, Critical Analysis, and Potential Recommendations," Energies, MDPI, vol. 14(18), pages 1-31, September.
    8. Zbigniew Plutecki & Paweł Sattler & Krystian Ryszczyk & Anna Duczkowska & Stanisław Anweiler, 2020. "Thermokinetics of Brown Coal during a Fluidized Drying Process," Energies, MDPI, vol. 13(3), pages 1-16, February.
    9. Peng Wang & Xingqi Luo & Jinling Lu & Qiyao Xue & Jiawei Gao & Senlin Chen, 2022. "Energy and Economic Analysis of Power Generation Using Residual Pressure of a Circulating Cooling Water System," Sustainability, MDPI, vol. 14(19), pages 1-20, October.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:14:y:2021:i:14:p:4259-:d:594438. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.