Control Of Superheat In Theprocess Of Waste Heat Utilization Using Organic Rankine Cycle

With the continuous increasing of focus on energy and the environment, energy conservation has been gradually put on the agenda by the government of each country. To reduce energy consumption, reduce fuel exhaust emissions, clean air environment and ensure the sustainable development of human society, the study of industrial waste heat recovery and utilization is becoming more and more popular in various countries. The waste heat utilization system based on organic Rankine cycle can well become industrial waste heat energy into electrical energy and other forms of mechanical energy. There-fore, this paper is to research the ORC waste heat utilization system in order to improve the heat transfer efficiency of waste heat utilization system.According to this paper, the utility of the waste heat has been researched fully in field of waste heat utilization systems.Considering the waste heat utilization based on ORC and the actual situation this paper choose R245fa as working fluid and do the re-search on ORC.The waste heat utilization system based on ORC consists of evaporator,refrigerant pump,condenser and expansion machine and other components.Through the research on the laws of thermodynamics utilized by organic Rankine cycle to determine the control strategy of the superheat in ORC waste heat recovery process, the establishment of a model evaporator and an superheat control system build up. The control system uses a cascade control, and then, the inner asynchronous motor vector control system speeds, which is mainly used to adjust the working fluid pump. Its inner part was seen as the ac-tuator of the outer loop of the superheat control system.The controller of superheat con-trol system established bases on the generalized predictive control algorithm.The con-troller of the outer loop controller is called the generalized model prediction controller. The prediction model is obtained by online identification. In this paper, the asynchronous motor control systems and superheat control system are simulated inthe environment of MATLAB/Simulink software.The simulation results showthe feasibility of ORC heat recovery process superheat control system throughly.