Effects of gasification condition on the overall performance of methanol-electricity polygeneration system

Zhen Qin, Sankar Bhattacharya, Kai Tang, Zaoxiao Zhang

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The operating conditions of coal gasifier have significant effects on the overall system performance of an associated process. This study designs a methanol-electricity polygeneration system and presents a comprehensive discussion about the effects of the ratio of steam to coal, the ratio of O2 to coal, the ratio of carrier gas (CO2) to coal and the CO2 concentration in methanol synthesis gas on different performance indicators. The results show that the steam/coal ratio has slight effects on the overall system performance due to the offset in different sections. An optimal O2/coal ratio exists in the range of 0.84–0.86 to achieve the minimum unit water consumption and the maximum methanol production and energy efficiency, which is almost consistent with the range that the H2 concentration in gasifier syngas reaches the maximum value. The amount of carrier gas CO2 and the CO2 concentration in methanol synthesis gas should be kept at a low level to just meet the requirements of coal pressurization and synthesis reaction. This comprehensive sensitivity analysis can provide some significant guidance for the system design.

Original languageEnglish
Pages (from-to)362-373
Number of pages12
JournalEnergy Conversion and Management
Volume184
DOIs
Publication statusPublished - 15 Mar 2019

Keywords

  • Coal gasification
  • Energy efficiency
  • H/C ratio adjustment
  • Polygeneration
  • Water consumption

Cite this

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abstract = "The operating conditions of coal gasifier have significant effects on the overall system performance of an associated process. This study designs a methanol-electricity polygeneration system and presents a comprehensive discussion about the effects of the ratio of steam to coal, the ratio of O2 to coal, the ratio of carrier gas (CO2) to coal and the CO2 concentration in methanol synthesis gas on different performance indicators. The results show that the steam/coal ratio has slight effects on the overall system performance due to the offset in different sections. An optimal O2/coal ratio exists in the range of 0.84–0.86 to achieve the minimum unit water consumption and the maximum methanol production and energy efficiency, which is almost consistent with the range that the H2 concentration in gasifier syngas reaches the maximum value. The amount of carrier gas CO2 and the CO2 concentration in methanol synthesis gas should be kept at a low level to just meet the requirements of coal pressurization and synthesis reaction. This comprehensive sensitivity analysis can provide some significant guidance for the system design.",
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Effects of gasification condition on the overall performance of methanol-electricity polygeneration system. / Qin, Zhen; Bhattacharya, Sankar; Tang, Kai; Zhang, Zaoxiao.

In: Energy Conversion and Management, Vol. 184, 15.03.2019, p. 362-373.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Bhattacharya, Sankar

AU - Tang, Kai

AU - Zhang, Zaoxiao

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N2 - The operating conditions of coal gasifier have significant effects on the overall system performance of an associated process. This study designs a methanol-electricity polygeneration system and presents a comprehensive discussion about the effects of the ratio of steam to coal, the ratio of O2 to coal, the ratio of carrier gas (CO2) to coal and the CO2 concentration in methanol synthesis gas on different performance indicators. The results show that the steam/coal ratio has slight effects on the overall system performance due to the offset in different sections. An optimal O2/coal ratio exists in the range of 0.84–0.86 to achieve the minimum unit water consumption and the maximum methanol production and energy efficiency, which is almost consistent with the range that the H2 concentration in gasifier syngas reaches the maximum value. The amount of carrier gas CO2 and the CO2 concentration in methanol synthesis gas should be kept at a low level to just meet the requirements of coal pressurization and synthesis reaction. This comprehensive sensitivity analysis can provide some significant guidance for the system design.

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