Performance Analysis Of Combined Cooling, Heating And Power System Integrated With Compressed Air Energy Storage

With the development of the world economy,the concept of sustainable development has gradually penetrated the hearts of the people.The combined cooling,heating and power(CCHP)system has been widely used in the world due to its environmental friendliness,high energy utilization rate and good economic efficiency.However,due to the mismatch between building load and system capacity,the CCHP system cannot fully exploit its advantages.The use of energy storage devices can play the role in cutting peaks and filling valleys and balancing grid load.This paper sets the evaluation criteria and analyzes a CCHP system integrated with compressed air energy storage.Using DeST software to set the office building model,the hourly cold,heat and power load and heat-to-electric ratio in typical days were obtained,and the CCHP system with gas turbine as the power device was selected as the building.energy supply system.The mathematical model of the full working condition of CCHP system was established by using EES software.The change law of gas turbine and lithium bromide absorption unit under full working condition and the influence of energy storage pressure ratio on the air storage energy storage(CAES)device were obtained The system is evaluated using three evaluation indicators(AOCR,PESR and CERR)from three aspects: economy,energy saving and carbon dioxide emission reduction.With economics as the maximum weight,the comprehensive evaluation index ACP was established.The system was analyzed on the premise that the C60 model gas turbine was selected as the power unit of the system.The CCHP system is used in summer and winter,and the CCHP system is not used during the transitional season because of the small heat and cold load.The results show that within a certain range of gas turbine capacity,the performance of CCHP system is better than production system.With the increase of gas turbine capacity,the larger the power supply ratio of CCHP system,the better the system performance.When five C60 units were selected,CCHP system supplied 81.48 % of electricity load and 86.18% of cooling load in summer typical day,and 95.19 % of electricity load and 76.70 % of heat load in winter typical day,which can basically meet the building load demand.The number of ACP is 0.2963,0.2586,respectively.For the compressed air energy storage(CAES)device,the higher the compression level when storage power was constant,the slower the output power becomes smaller.For the CCHP system integrated with compressed air energy storage,the input power of the energy storage stage has little effect on the AOCR in winter,which is proportional to the RESR and inversely proportional to the CERR,compared with the tradition system,the number of ACP is always higher than the traditional CCHP system.With the increase of storage power,the greater the influence of the energy storage pressure ratio on the system.The larger the energy storage power,and the smaller the optimal pressureratio of the maximum value of the parameter.When the number of C60 units is 3~5,the performance of the number of equipment is 5 is the best,and the number of ACP is 10.31 % higher than traditional CCHP system.The CCHP system integrated with compressed air energy storage has no advantage over the traditional CCHP system during typical summer,so compressed air storage device is not used in summer.Choosing the appropriate system configuration and operation mode can significantly improve system performance in the winter.