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Multi-Stage Control of Waste Heat Recovery from High Temperature Slags Based on Time Temperature Transformation Curves

Author

Listed:
  • Yongqi Sun

    (Department of Energy and Resources Engineering, and Management, College of Engineering, Peking University, Beijing 100871, China)

  • Zuotai Zhang

    (Department of Energy and Resources Engineering, and Management, College of Engineering, Peking University, Beijing 100871, China
    Beijing Key Laboratory for Solid Waste Utilization, Peking University, Beijing 100871, China)

  • Lili Liu

    (Department of Energy and Resources Engineering, and Management, College of Engineering, Peking University, Beijing 100871, China)

  • Xidong Wang

    (Department of Energy and Resources Engineering, and Management, College of Engineering, Peking University, Beijing 100871, China
    Beijing Key Laboratory for Solid Waste Utilization, Peking University, Beijing 100871, China)

Abstract

This paper presents a significant method and a basic idea of waste heat recovery from high temperature slags based on Time Temperature Transformation (TTT) curves. Three samples with a fixed CaO/SiO 2 ratio of 1.05 and different levels of Al 2 O 3 were designed and isothermal experiments were performed using a Single Hot Thermocouple Technique (SHTT). The TTT curves established through SHTT experiments described well the variation of slag properties during isothermal processes. In this study, we propose a multi-stage control method for waste heat recovery from high temperature slags, in which the whole temperature range from 1500 °C to 25 °C was divided into three regions, i.e. , Liquid region, Crystallization region and Solid region, based on the TTT curves. Accordingly, we put forward an industrial prototype plant for the purpose of waste heat recovery and the potential of waste heat recovery was then calculated. The multi-stage control method provided not only a significant prototype, but also a basic idea to simultaneously extract high quality waste heat and obtain glassy phases on high temperature slags, which may fill the gap between slag properties and practical waste heat recovery processes.

Suggested Citation

  • Yongqi Sun & Zuotai Zhang & Lili Liu & Xidong Wang, 2014. "Multi-Stage Control of Waste Heat Recovery from High Temperature Slags Based on Time Temperature Transformation Curves," Energies, MDPI, vol. 7(3), pages 1-12, March.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:3:p:1673-1684:d:34251
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    References listed on IDEAS

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    1. Barati, M. & Esfahani, S. & Utigard, T.A., 2011. "Energy recovery from high temperature slags," Energy, Elsevier, vol. 36(9), pages 5440-5449.
    2. Zhang, Hui & Wang, Hong & Zhu, Xun & Qiu, Yong-Jun & Li, Kai & Chen, Rong & Liao, Qiang, 2013. "A review of waste heat recovery technologies towards molten slag in steel industry," Applied Energy, Elsevier, vol. 112(C), pages 956-966.
    3. Bisio, G., 1997. "Energy recovery from molten slag and exploitation of the recovered energy," Energy, Elsevier, vol. 22(5), pages 501-509.
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    Cited by:

    1. Wu, Junjun & Tan, Yu & Li, Peng & Wang, Hong & Zhu, Xun & Liao, Qiang, 2022. "Centrifugal-Granulation-Assisted thermal energy recovery towards low-carbon blast furnace slag treatment: State of the art and future challenges," Applied Energy, Elsevier, vol. 325(C).
    2. Di Gao & Fu-Ping Wang & Yi-Tong Wang & Ya-Nan Zeng, 2020. "Sustainable Utilization of Steel Slag from Traditional Industry and Agriculture to Catalysis," Sustainability, MDPI, vol. 12(21), pages 1-9, November.
    3. Yao, Xin & Liu, Yang & Yu, Qingbo & Wang, Shuhuan, 2023. "Energy consumption of two-stage system of biomass pyrolysis and bio-oil reforming to recover waste heat from granulated BF slag," Energy, Elsevier, vol. 273(C).
    4. Yongqi Sun & Zuotai Zhang & Lili Liu & Xidong Wang, 2015. "Heat Recovery from High Temperature Slags: A Review of Chemical Methods," Energies, MDPI, vol. 8(3), pages 1-19, March.
    5. Duan, Wenjun & Gao, Yunke & Yu, Qingbo & Wu, Tianwei & Wang, Zhimei, 2019. "Numerical simulation of coal gasification in molten slag: Gas-liquid interaction characteristic," Energy, Elsevier, vol. 183(C), pages 1233-1243.

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