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Application of total process energy-integration in retrofitting an ammonia plant

Author

Listed:
  • Wang, Yao
  • Du, Jian
  • Wu, Jintao
  • He, Gaohong
  • Kuang, Guozhu
  • Fan, Xishan
  • Yao, Pingjing
  • Lu, Shenglin
  • Li, Peiyi
  • Tao, Jigang
  • Wan, Yong
  • Kuang, Zhengyang
  • Tian, Yong

Abstract

A case study of total process energy-integration in a commercial ammonia plant was performed using a modified pinch analysis. Several tools, including Grid Diagram, Composite Curve (CC), Grand Composite Curve (GCC), Balanced Grand Composite Curve (BGCC) and Splitting Grand Composite Curve (SGCC), were adapted in the diagnosis of process energy-utilizing. It is shown that the utility loads calculated by operating pinch calculation (OPC) were very close to those in the existing process, and that the method could be used to describe the heat-flow profile of the plant. Some inefficient energy use in the plant was observed in the calculation. The design pinch calculation (DPC) revealed that 1150 kg/h of fuel gas (natural gas) and 1322 t/h of cooling water could be saved through optimizing the temperature difference contribution value ([Delta]Tc) of heat transfer in each stream for an existing ammonia plant. And a proposal for energy saving is presented. The energy-integration technology showed great promise in the retrofit of large-scale complex process. The successful application of this technology in more than 10 Chinese plants has generated a profit of about 80 million RMB per year.

Suggested Citation

  • Wang, Yao & Du, Jian & Wu, Jintao & He, Gaohong & Kuang, Guozhu & Fan, Xishan & Yao, Pingjing & Lu, Shenglin & Li, Peiyi & Tao, Jigang & Wan, Yong & Kuang, Zhengyang & Tian, Yong, 2003. "Application of total process energy-integration in retrofitting an ammonia plant," Applied Energy, Elsevier, vol. 76(4), pages 467-480, December.
    • Handle: RePEc:eee:appene:v:76:y:2003:i:4:p:467-480
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    References listed on IDEAS

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    1. Ebrahim, Mubarak & Kawari, Al-, 2000. "Pinch technology: an efficient tool for chemical-plant energy and capital-cost saving," Applied Energy, Elsevier, vol. 65(1-4), pages 45-49, April.
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    1. Tian, Jinping & Shi, Han & Li, Xing & Chen, Lujun, 2012. "Measures and potentials of energy-saving in a Chinese fine chemical industrial park," Energy, Elsevier, vol. 46(1), pages 459-470.
    2. Panjeshahi, M.H. & Ghasemian Langeroudi, E. & Tahouni, N., 2008. "Retrofit of ammonia plant for improving energy efficiency," Energy, Elsevier, vol. 33(1), pages 46-64.
    3. Liew, Peng Yen & Lim, Jeng Shiun & Wan Alwi, Sharifah Rafidah & Abdul Manan, Zainuddin & Varbanov, Petar Sabev & Klemeš, Jiří Jaromír, 2014. "A retrofit framework for Total Site heat recovery systems," Applied Energy, Elsevier, vol. 135(C), pages 778-790.
    4. Feng, Xiao & Pu, Jing & Yang, Junkun & Chu, Khim Hoong, 2011. "Energy recovery in petrochemical complexes through heat integration retrofit analysis," Applied Energy, Elsevier, vol. 88(5), pages 1965-1982, May.
    5. Chauhan, Shivendra Singh & Khanam, Shabina, 2019. "Enhancement of efficiency for steam cycle of thermal power plants using process integration," Energy, Elsevier, vol. 173(C), pages 364-373.
    6. Li, Huiquan & Bao, Weijun & Xiu, Caihong & Zhang, Yi & Xu, Hongbin, 2010. "Energy conservation and circular economy in China's process industries," Energy, Elsevier, vol. 35(11), pages 4273-4281.

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