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A novel cascade refrigeration process using waste heat and its application to coal-to-SNG

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  • Yang, Sheng
  • Liang, Jianeng
  • Yang, Siyu
  • Qian, Yu

Abstract

To efficiently develop coal-based chemical processes in China faces many challenges. A large amount of waste heat in the process is not efficiently employed. The proportion of energy that is fully utilized is extremely low. This paper proposes cascade refrigeration technology (CRT) that combines a LiBr absorption refrigeration with a NH3 absorption refrigeration. The CRT is driven by low-grade waste heat below 150 °C and produces high-grade cold energy. The CRT is applied to a coal-to-SNG project as a case study. In a 4 billion Nm3/a coal-to-SNG plant, the CRT is integrated to use low-grade heat taken from the methanation unit. Produced cold energy is used in the Rectitsol unit to remove CO2. Results show that it reduces the compression refrigeration by 16%. The absolute gain is 3.4 × 107 million CNY per year.

Suggested Citation

  • Yang, Sheng & Liang, Jianeng & Yang, Siyu & Qian, Yu, 2016. "A novel cascade refrigeration process using waste heat and its application to coal-to-SNG," Energy, Elsevier, vol. 115(P1), pages 486-497.
    • Handle: RePEc:eee:energy:v:115:y:2016:i:p1:p:486-497
    DOI: 10.1016/j.energy.2016.09.039
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    Cited by:

    1. Li, Guang & Chang, Yuxue & Liu, Tao & Yu, Zhongliang & Liu, Zheyu & Liu, Fan & Ma, Shuqi & Weng, Yujing & Zhang, Yulong, 2020. "Hydrogen element flow and economic analyses of a coal direct chemical looping hydrogen generation process," Energy, Elsevier, vol. 206(C).
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    3. He, Yangdong & Zhu, Lin & Li, Luling & Rao, Dong, 2019. "Life-cycle assessment of SNG and power generation: The role of implement of chemical looping combustion for carbon capture," Energy, Elsevier, vol. 172(C), pages 777-786.
    4. Mingzhang Pan & Huan Zhao & Dongwu Liang & Yan Zhu & Youcai Liang & Guangrui Bao, 2020. "A Review of the Cascade Refrigeration System," Energies, MDPI, vol. 13(9), pages 1-26, May.
    5. Yang, Sheng & Qian, Yu & Wang, Yifan & Yang, Siyu, 2017. "A novel cascade absorption heat transformer process using low grade waste heat and its application to coal to synthetic natural gas," Applied Energy, Elsevier, vol. 202(C), pages 42-52.
    6. Xu, Xiangguo & Li, Yishu & Yang, ShenYin & Chen, Guangming, 2017. "A review of fishing vessel refrigeration systems driven by exhaust heat from engines," Applied Energy, Elsevier, vol. 203(C), pages 657-676.
    7. Wang, Yinglong & Chen, Zhengrun & Shen, Yuanyuan & Ma, Zhaoyuan & Li, Huiyuan & Liu, Xiaobin & Zhu, Zhaoyou & Qi, Jianguang & Cui, Peizhe & Wang, Lei & Ma, Yixin & Xu, Dongmei, 2021. "Advanced exergy and exergoeconomic analysis of an integrated system combining CO2 capture-storage and waste heat utilization processes," Energy, Elsevier, vol. 219(C).

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