有机朗肯循环方法回收液压系统余热试验研究

A scheme of waste heat recovery and utilization of hydraulic system based on organic Rankine cycle is proposed to solve the problems of high energy consumption and serious waste of heat energy during cooling of traditional oil coolers in hydraulic system and to improve the comprehensive energy efficiency of the system. A test platform for waste heat recovery of the hydraulic system is built to study the influences of electric load, oil flow rate, and flow rate of the working fluid on the system operation and energy characteristics. Experimental results show that, compared with the oil cooler of the same specification, the system' maximum thermal efficiency of the proposed scheme increases to 2.56% under the same working conditions. The pressure ratio of the expander and the thermal efficiency of the system increase with the increase of electric load and oil flow rate. With the increase of the flow rate of the working fluid, the superheat of the working fluid at the inlet of the expander decreases significantly, while the heat flow rate in the evaporator and the output power of the expander increase. Under the testing condition, the maximum heat flow rate in the evaporator is 4.18 kW, and the maximum output power of the expander is 356 W. The test results verify the energy saving effect of the waste heat recovery system of the hydraulic system, and reveal the influence laws of operating parameters on the system performance.