Research On Power Generation System Of Waste Heat Recovery Based On Compressed Air Energy Storage

At present,most of the waste heat recovery systems are only suitable for the recovery of waste heat from hot fluids at high temperatures.There are few and immature studies on waste heat from adiation-type waste heat.Most of the waste heat recovery systems have complex structures and use low boiling point organic compounds as working fluid,which results in high operating costs.In case of leakage,it will do great harm to the environment.Compressed air is environmentally friendly and easy to prepare.Combining compressed air energy storage with waste heat recovery system can simplify the system structure and reduce the operation cost.Therefore,it is of great practical significance to carry out research on waste heat recovery system with compressed air as working medium.Combining with the production process of aluminium trichloride in Dongying Kunbao Chemical Co.,Ltd.,this paper designs the corresponding waste heat recovery device to recover the surface radiant heat of molten aluminium,and puts forward a waste heat recovery power generation system using compressed air as working medium.The system can recover the waste heat generated in the production process,optimize the working environment and improve the energy efficiency.According to the idea of modularization,the waste heat recovery power generation system is divided into several sub-modules and basic units.Combined with the construction of heat transfer and thermodynamics first law,the establishment of a thermodynamic model of each basic unit of the.The basic unit theory models are reconstructed and connected to establish the system efficiency model and the system power and heat consumption model.According to the parameters and requirements of the system design,the waste heat recovery device of the system is designed,and the radiation heat transfer process and convective heat transfer process of waste heat recovery are simulated and analyzed by using Workbench and Fluent.In this paper,the effects of radiation heat transfer distance,system flow rate,outlet pressure and wall temperature on working characteristics of waste heat recovery unit are studied,which provides a theoretical basis for the next optimization of waste heat recovery device.Based on the study of thermodynamic characteristics of waste heat recovery device,energy efficiency analysis of energy storage module and energy release module of the system is carried out.In the case of stable system output,the energy storage density of the system is analyzed by using MATLAB,and the dynamic relationship between the key input parameters of the energy release module(expander inlet pressure,inlet temperature,system flow rate)is simulated.Based on this,the system efficiency,system power consumption and system heat consumption are simulated to obtain the optimal input region of the key input parameters of the system.A comprehensive experimental platform for waste heat recovery power generation system was built for experimental research.According to the experimental steps and methods,the system efficiency,HR and ER are analyzed experimentally.Compared with the simulation results,the experimental results show the same trend,which proves the correctness of the simulation research.