Sustainability metrics, a cradle-to-gate life cycle assessment, and a technoeconomic evaluation are presented for an optimized entrained-flow coal oxy-combustion plant with carbon capture to produce power and methanol. The aim of the study is to assess the feasibility of coproducing methanol in a coal-based power plant with an entrained-flow coal gasification system. Coal-based methanol, as an attractive liquid transportation fuel as well as an essential intermediate chemical feedstock, can fill a possible gap between declining fossil fuel supplies and movement toward the hydrogen economy. Within the plant, first the coal is fed to a pyrolysis reactor, and then the volatile matter is fed into an oxy-combustion reactor while the char is gasified in an entrained-flow gasifier. The remaining char is gasified. The heat is used to produce electricity, while the syngas is converted to methanol. The integral plant, consisting of an air separation unit, oxy-combustion of coal, gasification of char, electric power production, carbon capture, and conversion to methanol, was designed and optimized using the Aspen Plus package. The optimization includes the design specification of process heat integration using an energy analyzer toward a more efficient clean-coal technology with methanol production. The plant uses 500 metric tons (MT) of Powder River Basin coal and 2231.03 MT of air per day and produces 32.76 MWh of electric power and 207.99 MT of methanol per day. The total amount of captured CO₂ is 589.75 MT/day, and nitrogen is also produced at 1309.33 MT/day. A multicriteria decision matrix consisting of economic indicators as well as the sustainability metrics is developed to assess the feasibility of the extended plant. Methanol production in addition to power production may improve the overall feasibility of coal-powered plants.

中文翻译：

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气流床煤气化系统生产动力和甲醇的可行性

提出了一种优化的带气流捕集煤制氧燃烧装置的可持续性指标，从摇篮到大门的生命周期评估以及技术经济评估，该装置具有碳捕集以生产电力和甲醇的功能。该研究的目的是评估在带有气流床煤气化系统的煤电厂中联产甲醇的可行性。煤基甲醇作为一种有吸引力的液体运输燃料以及一种必不可少的中间化学原料，可以填补化石燃料供应减少与氢能经济发展之间的空白。在工厂内，首先将煤进料到热解反应器中，然后将挥发性物质进料到氧燃烧反应器中，同时在气流床气化炉中将焦炭气化。剩余的焦炭被气化。热量用来发电 同时将合成气转化为甲醇。使用Aspen Plus套件设计和优化了由空气分离装置，煤的氧燃烧，炭化，发电，碳捕集和转化为甲醇组成的整体装置。优化包括使用能源分析仪的过程热集成的设计规范，以及采用甲醇生产的更高效的洁净煤技术。该工厂每天使用500吨粉末河盆地的煤炭和2231.03 MT的空气，每天生产32.76 MWh的电力和207.99 MT的甲醇。捕获的CO总量 并使用Aspen Plus软件包对转化为甲醇进行了设计和优化。优化包括使用能源分析仪的过程热集成的设计规范，以及采用甲醇生产的更高效的洁净煤技术。该工厂每天使用500吨粉末河盆地的煤炭和2231.03 MT的空气，每天生产32.76 MWh的电力和207.99 MT的甲醇。捕获的CO总量 并使用Aspen Plus软件包对转化为甲醇进行了设计和优化。优化包括使用能源分析仪的过程热集成的设计规范，以及采用甲醇生产的更高效的洁净煤技术。该工厂每天使用500吨粉末河盆地的煤炭和2231.03 MT的空气，每天生产32.76 MWh的电力和207.99 MT的甲醇。捕获的CO总量 每天99吨甲醇。捕获的CO总量 每天99吨甲醇。捕获的CO总量₂是589.75 MT /天，并且还以1309.33 MT /天产生氮气。建立了由经济指标和可持续性指标组成的多准则决策矩阵，以评估扩建工厂的可行性。除了发电之外，甲醇生产还可以改善燃煤电厂的总体可行性。