ENERGY STORAGE-RELEASE EFFICIENCY AND CARBON EMISSION OF GREEN ELECTRIC COUPLING BIOMASS TO METHANOL PRODUCTION

Song Guohui; Zhao Liang; Wang Jinping; Wang Hongyan; Xiao Jun

doi:10.19912/j.0254-0096.tynxb.2023-1781

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (12) : 478-484. DOI: 10.19912/j.0254-0096.tynxb.2023-1781

ENERGY STORAGE-RELEASE EFFICIENCY AND CARBON EMISSION OF GREEN ELECTRIC COUPLING BIOMASS TO METHANOL PRODUCTION

Song Guohui^1,2, Zhao Liang³, Wang Jinping^1,2, Wang Hongyan¹, Xiao Jun⁴

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Abstract

Facing the demands of energy storage and decarbonization, the technology of methanol production from biomass coupled with wind power was studied using wheat straw and sawdust as feedstock. The performances were analyzed and evaluated including the methanol yield, the energy efficiency of storage-release processes （i.e., storage-release efficiency）, the life cycle carbon emissions, and the differences between power generation model and cogeneration mode for methanol utilization. Without the separation of CO₂ in product gas, only the one-way conversion rates of CO₂ and CO have obvious impacts on the methanol yield, ranging from 0.970 to 1.104 kg/kg. The efficiency of water electrolysis is the key parameter to improve the storage-release efficiency. Both storage-release efficiency and carbon emission intensity under the cogeneration mode have significantly advantages over those under pure power generation mode. Under the cogeneration mode, the storage-release efficiency varies from 46.1% to 58.6%, which is similar to that of the compressed air energy storage. The ranges of carbon emission intensity of the regenerated electricity and thermal energy are 37-77 g CO₂/kWh and 10-21 g CO₂/MJ, respectively, which are significantly lower than the current levels of the products. The carbon emission intensities with sawdust as feedstock are significantly lower than those with wheat straw. This technology with separation and capture of CO₂ in product gas can achieve the zero-carbon emission in the life span at the cost of decreases in the methanol yield, power rate, and storage-release efficiency.

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methanol / electrolysis / biomass / storage-release efficiency / zero carbon emission

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Song Guohui, Zhao Liang, Wang Jinping, Wang Hongyan, Xiao Jun. ENERGY STORAGE-RELEASE EFFICIENCY AND CARBON EMISSION OF GREEN ELECTRIC COUPLING BIOMASS TO METHANOL PRODUCTION[J]. Acta Energiae Solaris Sinica. 2024, 45(12): 478-484 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1781

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