Screening Strategy Of Organic Rankine Cycle System Based On Data Envelop Analysis

While modern industrial production consumes a lot of energy has produced a lot of industrial waste heat,which accounts for the highest proportion of medium-low temperature heat energy.It will play a key role in the adjustment of our country’s energy structure if we can realize the recovery and utilization of these heat energy.Among the currently known utilization methods of medium and low temperature heat energy,Organic Rankine Cycle(ORC)waste heat power generation technology can transform low-grade energy such as industrial waste heat,geothermal energy and solar energy into high-grade energy such as mechanical energy and electric energy,which has the advantages of high efficiency,simple structure and environmental protection.It is an effective means to recover medium and low grade heat energy.Organic Rankine recycling system is simple in structure,the key to determine whether it is efficient for waste heat recovery and utilization lies in the selection of organic working medium.Since the working medium of organic Rankine circulation system has various types,quantities and different recovery effects on waste heat,selecting the appropriate organic working medium is the premise of realizing effective recovery of waste heat in ORC system and improving energy utilization efficiency.This project explores the process and puts forward the strategy of evaluating and screening the working medium of organic Rankine circulation system by using the multi-objective evaluation method of Data Envelopment Analysis(DEA).The specific research content is as follows:(1)In view of the different waste heat temperature,the recovery effect of working medium on the waste heat in the organic Rankine cycle system is different.The process simulation software is used to simulate and optimize the ORC system to obtain the operating conditions and related data under the optimal thermal efficiency.(2)The thermodynamic performance of ORC system and the economic and environmental performance conducive to the development of enterprises were studied,the mathematical model was established and calculated,and the single target evaluation of ORC system was used,and found that the evaluation results of each index were quite different,and it was difficult to carry out effective working medium screening.(3)According to the characteristics of the standard for judging the waste heat recovery effect of organic Rankine circulation system in actual industrial production,the effective evaluation index in actual production is given,the DEA model is established,and the working medium is evaluated with multiple objectives.The results show that when the evaporation temperature is reduced,the effective gap between the working medium is small,the comprehensive gap performance is small,the number of optimal working medium is increased,and the DEA multi-objective evaluation method realizes the effective screening of ORC system according to the combination of different indices.(4)The objective and comprehensive evaluation of working fluids is completed by combining different evaluation indicators at different evaporation temperatures,facilitating the selection of suitable working fluids according to different needs in actual production.In view of the problems that the traditional method of selecting working medium by reference to thermodynamic properties is single and subjective,and does not conform to the direction of enterprise operation in the new era.Based on overcoming the shortcomings of traditional evaluation methods and meeting the needs of actual industrial production,this paper proposes and studies the strategy of using data envelopment analysis method to evaluate and screen the working medium of organic Rankine circulation system.It provides a new idea for the selection of working medium of organic Rankine circulation system for low temperature waste heat power generation,and provides theoretical basis and data support for the accurate and rapid selection of appropriate organic working medium in practical industrial production.