Comprehensive Evaluation And Management Decision Research On Coal Power Units Retrofitted With CCUS In Power Transformation

The climate crisis of global warming,which is mainly caused by the increase of CO2 concentration in the atmosphere,has attracted the common concern of all countries.As the largest carbon emitting country,China has assumed an important task in the process of coping with the global climate change crisis.The power industry is an important industry that drives China’s economic and social development.As one of the main sources of carbon emissions in China,the low-carbon transformation of the power system is related to the overall process of achieving China’s carbon neutrality goal.There are the largest and youngest stock of coal power units in the world in China.Renewable energy generation is developing rapidly,but coal power is still the main source of electricity at present and even for a long time to come.The lowcarbon transformation of the power system cannot be at the expense of economy and safety,and how to reduce carbon emissions while ensuring the safety and stability of the system is the key to the low-carbon transformation of China’s power system.Carbon Capture,Utilization and Storage(CCUS)is the only technology that can realize the large-scale low-carbon utilization of fossil energy at this stage,and will be the key technology for the low-carbon transition of China’s power system and achieving the goal of carbon neutrality.Coal power is the most important source of carbon emissions in China,so it is necessary to study and analyze the CCUS retrofitting of coal power in power system transformation.In this paper,based on combing domestic and international studies on the application potential,cost analysis and deployment planning of CCUS,and taking into account the actual situation of coal power CCUS retrofit in China,an index system for evaluating the suitability of coal power CCUS retrofit is constructed from three aspects:unit attributes,unit operation,and CCUS adaptability.It also combines the Analytic Hierarchy Process(AHP)and Entropy Weight Method to conduct a comprehensive evaluation of the suitability of CCUS transformation of coal power units in China and analyze the potential of CCUS retrofit of coal power units in China.Further,on the basis of the existing comprehensive evaluation results,coal power units of a certain scale suitable for CCUS retrofit are screened out and source-sink matching calculations and analyses are performed.The study results show that the main factors affecting the suitability of CCUS retrofit for coal power units include the installed capacity of the unit,the cost of CO2 capture,the amount of CO2 that can be captured,and the potential for CO2 storage within a reasonable distance.There are 743.1 GW of coal power units in China suitable for CCUS retrofitting,with greater potential for retrofitting in North China,Northwest China and East China.Under the 2℃ target constraint,China needs to carry out CCUS retrofitting for 185.2GW of coal power units mainly in Inner Mongolia,Shandong,Xinjiang and other regions,with a total cost of 3364.2 billion RMB for CO2 emission reduction.In addition,this paper finds that the cost of CO2 capture has the greatest impact on the abatement cost,while the benefits of CO2 enhanced oil recovery have limited effect on relieving the economic pressure of CCUS retrofitting for coal power.In the future,we need to accelerate the development of new generation of low-cost carbon capture technologies,supplemented by certain carbon market and electricity market mechanisms,as a way to reduce the economic burden of coal power CCUS retrofit.