Abstract
Integrated energy production unit (IEPU), consisting of coal-fired and renewable power generation, electrolysis hydrogen production and CO2 capture and utilization, is promising to realize the carbon–neutral goal by handling the intermittency of renewable energy and CO2 reduction in an integrated framework. However, the operational scheduling and capacity configuration of IEPU is challenging due to the internal couplings among the multiple energy and material flow. To this end, this paper develops the operational and economic models of IEPU, containing the equipment of Power-to-gas/methane (P2G) and Power-to-methanol (P2M). A mixed integer linear programming problem is formulated by taking equivalent annual operating cost as the objective function, and the conservation conditions and safety boundaries as constraints. Optimized results show that the IEPU holds promising prospects for facilitating renewable energy integration and CO2 reduction. Techno- economic analysis indicates that the yield of methane is greater than that of methanol, when the investment cost of electrolyser is above 3000 CNY/kW, and otherwise methanol production is dominant. These results will be beneficial for the planning and commissioning of practical IEPU projects in the future.
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