Dynamic Performance Simulation And Analysis Of Solar Driven Organic Rankine Cycle System

China is rich in solar energy resources, and the resource-rich region is sparsely populated, so the potential of solar power is huge. But at this stage, due to the lack of efficient techniques, coupled with its own low solar energy density defects, making solar energy utilization is low. Organic Rankine Cycle(ORC) has a high cycle efficiency, low vapor pressure and temperature and is an excellent middle and low energy technology with good match with solar energy. Therefore, the development of solar driven organic Rankine cycle power technology, it's important for our country to alleviate our energy crisis and perfect the middle and low energy utilization technology.This paper based on full investigation, completing the operating conditions, equipment selection, system design and the construction of the 200 kW class Organic Rankine cycle power system. The system includes three parts including heat source loop, ORC loop and cooling loop. The system uses R123 as the working fluid, T-55 oil as a heat source fluid, shell-and-tube heat exchanger and shield pump.This paper established a dynamic performance model based on the actual system design. Establish exchanger model uses distributed parameter method, based on conservation equation and energy conservation equation. Turbine and pump model use steady-state model because the response time is much less than the heat exchanger, and their export parameters are determined by the pressure ratio, head of delivery and efficiency. Model-based design simulation research methods, and discusses the method for solving solar-powered ORC system model parameters from three aspects including. Using Simulink platform, based on the model and simulation method to establish the components of the solar-driven ORC system, and build the dynamic system models according to the coupling relationship between the system components. The simulation model was tested by the experimental data, and simulates operational system performance in standard conditions of typical days and non-standard conditions under cloud disturbances and pump failure. The result shows that :( 1) in typical days, the heat/electric power of system main components have the same trend with the solar radiation changes. The changes of radiation have the greatest impact on the system in summer solstice. Evaporator and condenser heat power, steam turbine power acting maximum relative variation were 18.2%,18.0% and 18.4%, while the biggest change in efficiency is only 2.2%.(2) It's the third power relation between the heat source temperature step resulting from solar radiation step and response time, and cloud disturbance to steam turbine is 2.21% and 2.67% higher than the evaporator and condenser, respectively.(3)A linear correlation exists between the variation of the heat source loop pump and cooling loop flow rate and the reciprocal of deteriorative time of system performance, and the response time of the cooling loop pump failure is much larger than the time of heat transfer working fluid pump.