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Comprehensive energy analysis and integration of coal-based MTO process

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  • Liu, Shuoshi
  • Yang, Lu
  • Chen, Bokun
  • Yang, Siyu
  • Qian, Yu

Abstract

With low oil prices, the existing coal-to-olefin enterprises are forced to improve profitability by reducing energy consumption. This paper studies the comprehensive energy analysis and integration of coal-based MTO process. Process simulation is established first and is validated by comparing with the industrial data. Energy analysis of the MTO process was then conducted, calculating relevant information of each heat exchange stream. The heat exchanger network synthesis was proposed by using gradual optimization integration strategy based on the T-H diagram. It was found that the hot energy of purified water and steam condensate could be fully utilized. The cold energy of ethylene tower could replace partial −24 °C refrigerant. It was also found that there is the possibility of multi-stage heat transfer in this process. The maximum energy recovery is achieved under the principle of energy cascade utilization and stepwise matching. The result showed that the new design decreases the utility duty and the required exchanger area by 4.76% and 8.63% compared with the industrial process. The capital cost, operation cost and total annual cost of total site are 8.17, 14.64 and 17.27 million $, which are 8.29%, 2.78% and 3.66% less than the industrial design.

Suggested Citation

  • Liu, Shuoshi & Yang, Lu & Chen, Bokun & Yang, Siyu & Qian, Yu, 2021. "Comprehensive energy analysis and integration of coal-based MTO process," Energy, Elsevier, vol. 214(C).
    • Handle: RePEc:eee:energy:v:214:y:2021:i:c:s0360544220321678
    DOI: 10.1016/j.energy.2020.119060
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    References listed on IDEAS

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    4. Man, Yi & Yang, Siyu & Zhang, Jun & Qian, Yu, 2014. "Conceptual design of coke-oven gas assisted coal to olefins process for high energy efficiency and low CO2 emission," Applied Energy, Elsevier, vol. 133(C), pages 197-205.
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    1. Wan, Zhanghao & Yang, Shiliang & Hu, Jianhang & Wang, Hua, 2023. "Catalyst-scale investigation of polydispersity effect on thermophysical properties in a commercial-scale catalytic MTO fluidized bed reactor," Energy, Elsevier, vol. 262(PA).

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