Studying Of Evaporator Pressure And Heat Transfer Efficiency Of Low Temperature Waste-heat Power Generation System

With China’s rapid economic development, energy consumption increaseddramatically, the environmental problems become increasingly serious. The energyproblem has become an important reason for restricting China’s economic development.How to save energy and develop new energy has become an urgent problem to be solved.Low temperature waste heat power generation of renewable energy and environmentprotection is one of the important measures.In this paper, describes the various organic Rankine cycle process. By centrifugalpump controlling the saturation pressure of the circulating working fluid in the evaporatoroutlet to the degree of superheat to the optimum value, so that the Rankine cycle efficiencyof heat transfer to the maximum value. Analysis of the advantages and disadvantages ofthe PID controller and fuzzy controller, and choose a regulator of the fuzzy PID controllerfor this article. First clear directly charged objects-asynchronous motor, and a detailedanalysis of the mathematical model; research space voltage vector (SVPWM) technology.Build the pump speed and pressure mathematical model based on similar principles ofcentrifugal pumps. Cycle working fluid. and selected R600a as the cycle working fluid ofthe waste heat recovery system, introduced the nature of R600a and correspondingrelationship of its saturation temperature and the saturation pressure.Based on the fuzzy PID controller model, the vector control system of inductionmotor model, centrifugal mathematical model and the mathematical relationship of thesaturation pressure and temperature of the circulating working fluid，build a Simulinkblock diagram of the system and the simulation。When the changes in the temperature ofthe external waste heat sources and lead to changes in the temperature of the evaporatoroutlet working fluid，obtain to the pump speed, the saturation pressure of the working fluid,the saturation temperature and the degree of superheat curve. Found-controlling systemswith faster dynamic response characteristics. Proved the superiority of the control strategy. In this paper, the low temperature waste heat below350℃, combined with the actualsituation of the project, selected organic refrigerant R600a as the working fluid of thewaste heat power generation system. Build a low-temperature waste heat power generationsystem. Through the experiment, to obtain the low temperature waste heat powergeneration organic Rankine cycle system each device of large number of practical data,validation control the evaporator pressure to the highest thermal efficiency control method.Provide valuable experimental data and experience for the next step to improve the systemstructure and the efficiency of the system heat exchanger.