Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 184, Issue -, Pages 362-373Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2019.01.055
Keywords
Polygeneration; Coal gasification; H/C ratio adjustment; Energy efficiency; Water consumption
Categories
Funding
- National Natural Science Foundation of China [51876150, 21736008]
- China Scholarship Council [201706280055]
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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 O-2 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 O-2/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 H-2 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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