Design And Research On Energy Saving Scheme For Air Compressor Suction Pretreatment

In response to the problems of high energy consumption and low efficiency of air compressors in summer,this article utilizes the energy-saving principle of air compressor suction cooling to propose an air compressor suction pre-treatment system composed of different cold source methods.Through theoretical research methods,different summer climate parameters in different regions are selected to analyze and discuss the thermodynamic performance,energy-saving and emission reduction benefits,and economic benefits of the suction pretreatment system.The feasibility of the plan is demonstrated,providing a theoretical basis for the development of actual devices.The main research content is as follows:(1)A method for calculating the thermophysical properties of humid air and a compressed energy consumption model were established.By solving the model,the impact of suction temperature and humidity on the energy consumption of air compressors was analyzed,clarifying the control objectives and strategies for the suction temperature and humidity in the air compressor pretreatment system.(2)To reduce the energy consumption of the suction pretreatment system’s cooling source supply,two novel combined cooling source supply schemes using closed-loop or open-loop cooling towers were proposed by combining the low-cost cooling capabilities of summer cooling towers with chiller units.Four different cold source air compressor suction pre-processing system schemes were designed based on the characteristics of multi-air compressor unit joint operation and traditional refrigeration unit and chiller unit cold source supply methods,including implementation methods that can achieve demand-based regulation and precise control of the suction temperature and humidity of air compressors.(3)Using Aspen simulation software,four simulation models of air compressor suction pretreatment systems were established,and experimental data on air compressors,compression refrigeration systems,cooling towers,and heat exchangers in literature were used to verify each module of the suction pretreatment system to ensure the reliability of the simulation results.The energy-saving percentage(PPS)evaluation index and an economic model considering equipment costs and depreciation were proposed.(4)Based on the climatic parameters of two regions with different climate characteristics,Nanjing and Urumqi,changes in the thermodynamic performance of the four suction pretreatment systems under variable operating conditions were explored,and the annual climate parameter variations in the two regions were considered to analyze the energy-saving benefits and economic benefits of the four suction pretreatment systems.The results show that reducing the suction temperature and moisture content of the air compressor can both reduce the energy consumption of the air compressor,and the influence of the suction temperature on the energy consumption of the air compressor is higher than that of the moisture content;When the air flow rate is greater than 60 m3/h,the thermodynamic performance and energy-saving and emission reduction benefits of the combined cold source suction pretreatment scheme are the best,and the advantages are more obvious in dry climate areas;The corresponding investment payback period is 11-24 months,which has good research and development value and market application prospects.