大规模火电CCUS应用的经济性评估及提升研究

Study on Economic Assessment and Improvement for Large-scale Thermal Power CCUS Applications

针对大规模开展火电CCUS改造的经济可行性问题,提出CO_(2)制甲醇的效益提升路径,设定了即刻改造、2025年改造和2030年改造3个不同改造时间的方案,基于西北某省电网公司的火电装机及火力发电量规划数据,进行了经济敏感性分析。结果表明:根据改造时间的不同,CCUS全流程改造将使全省电价上涨0.0778~0.1010元/(kW·h),当政府补贴达到240元/t时,方案1与方案2的电价分别上涨0.0311元/(kW·h)和0.0269元/(kW·h),方案3仅上涨0.0006元/(kW·h);若将捕集的CO_(2)用于制甲醇,1 t CO_(2)因为氢气消耗和制取甲醇产生的支出与收益分别为846.04元和2661.73元,额外电耗带来的购电成本为37.81元/t;若将国家补贴等因素考虑在内,经济效益最佳的方案3几乎可实现火电零成本脱碳。

In view of the economic feasibility of large-scale thermal power CCUS retrofitting,the efficiency improvement path of CO_(2)to methanol was proposed.Three different retrofitting time schemes of immediate retrofitting,2025 retrofitting and 2030 retrofitting were set up.Economic sensitivity analysis was conducted based on the thermal power installation and power generation capacity planning data of a power grid company in a northwestern province.Results show that the whole process retrofitting of CCUS will increase the electricity price of the province by 0.0778-0.1010 yuan/(kW·h)according to the different retrofitting time.When the government CO_(2)subsidy reaches 240 yuan/t,the electricity price of scheme 1 and scheme 2 will be increased by 0.0311 yuan/(kW·h)and 0.0269 yuan/(kW·h)respectively,which of scheme 3 will only be increased by 0.0006 yuan/(kW·h).If the captured CO_(2)is used for methanol production,the expenses and earnings of 1 t CO_(2)due to H2 consumption and methanol production are 846.04 yuan and 2661.73 yuan respectively,and the cost of electricity purchased for additional electricity consumption is 37.81 yuan/t.Considering the factors such as state subsidies,scheme 3 with the best economic efficiency can achieve almost zero-cost decarbonization of thermal power.