Comprehensive energy analysis and integration of coal-based MTO process

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

Energy, 2021, vol. 214, issue C

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.

Keywords: Methanol to olefins; Process simulation; Energy integration; Heat exchanger network synthesis; Techno-economic analysis (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:214:y:2021:i:c:s0360544220321678

DOI: 10.1016/j.energy.2020.119060

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