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Conceptual design of coke-oven gas assisted coal to olefins process for high energy efficiency and low CO2 emission

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  • Man, Yi
  • Yang, Siyu
  • Zhang, Jun
  • Qian, Yu

Abstract

Olefins are one of the most important platform chemicals. Developing coal-to-olefins (CTO) processes is regarded as one of promising alternatives to oil-to-olefins process. However, CTO suffers from high CO2 emission due to the high carbon contents of coal. In China, there is 7×1010m3 coke-oven gas (COG) produced in coke plants annually. However, most of the hydrogen-rich COG is utilized as fuel or discharged directly into the air. Such situation is a waste of precious hydrogen resource and serious economic loss, which causes serious environmental pollution either. This paper proposes a novel co-feed process of COG assist CTO in which CH4 of COG reacts with CO2 in a Dry Methane Reforming unit to reduce emissions, while the Steam Methane Reforming unit produces H2-rich syngas. H2 of COG can adjust the H/C ratio of syngas. The analysis shows that the energy efficiency of the co-feed process increases about 10%, while at the same time, life cycle carbon footprint is reduced by around 85% in comparison to the conventional CTO process. The economic sustainability of the co-feed process will be reached when the carbon tax would be higher than 150 CNY/t CO2.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:133:y:2014:i:c:p:197-205
    DOI: 10.1016/j.apenergy.2014.07.105
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