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

Yi Man, Siyu Yang, Jun Zhang and Yu Qian

Applied Energy, 2014, vol. 133, issue C, 197-205

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.

Keywords: Coal-to-olefins; Coke-oven gas; Dry methane reforming; Energy efficiency; Techno-economic analysis (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (19)

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DOI: 10.1016/j.apenergy.2014.07.105

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