综合能源生产单元(integrated energy production unit,IEPU)通过耦合可再生能源制氢与火电碳捕集技术,制备易于储运的绿色燃料,在协调解决可再生能源消纳、碳利用及氢能储运等问题方面具有良好的应用前景.为定量评价IEPU 的技术经济性与降碳潜力,该文通过构建 IEPU 工艺流程的仿真模型,模拟风电制氢、甲醇合成及压缩提纯等关键过程,建立多能流与物料流数据的全生命周期清单,进行碳足迹评价,并指出进一步碳减排的可行路径;通过对能量效率、电流密度等技术参数及风电价格、碳税等经济参数进行灵敏度分析,开展不同技术经济性背景下的经济性评估,探究IEPU的盈利条件.碳足迹评价表明,年产39万t绿色甲醇IEPU的全生命周期净碳减排量达 5.88 万t.技术经济性评估表明,在良好的技术经济性背景下,当风电售价降低至 0.21 元/(kW·h),基于 IEPU 生产的绿色甲醇成本可与传统甲醇生产工艺相当.
Life-cycle Carbon Footprint Assessment and Techno-economic Analysis of Integrated Energy Production Unit
The Integrated Energy Production Unit(IEPU)couples green hydrogen production with carbon capture technology of coal-fired power plants to produce green fuels that are convenient for storage and transportation.IEPU is promising in facilitating renewable energy consumption,carbon utilization,and hydrogen storage and transportation.To quantitatively evaluate the technical and economic feasibility and decarbonization potential of IEPU,this paper constructs a simulation model of the IEPU process flow,simulates key processes such as wind power hydrogen production,methanol synthesis,and compression and purification,establishes a full lifecycle inventory of multiple energy and material flows,conducts carbon footprint evaluation,and identifies feasible paths for further carbon reduction.Sensitivity analysis is conducted in terms of technical parameters such as energy efficiency and current density,and economic parameters such as wind power prices and carbon taxes,to evaluate the economic feasibility of IEPU under different technical and economic backgrounds and explore the profitability conditions of IEPU.The carbon footprint evaluation shows that the full lifecycle net carbon reduction of a 390 kilotons/year green methanol production unit is 58.8 kilotons/year.Technical and economic evaluation shows that,under a favorable technical and economic background,the wind power price of 0.21RMB/(kW·h)allows the cost of the proposed IEPU based green methanol production to be comparable to that of traditional plants.
integrated energy production unit(IEPU)carbon capture and utilizationgreen fuellife cycle assessmenttech-economic analysis