The Analysis Of Operating Parameter And System Simulation Of Organic Rankine Cycle Driven By Geothermal Water

Energy is the driving force of social development. At present, China is a major country of energy consuming in the world. But the storage of conventional energy source can’t meet the demand at long-term, the development and utilization of renewable energy is the ultimate goal in the future.for the sustainable development of resources, environment and society, cleaning. In recent years, many countries have formulated policies to encourage the use of new energy. At the same time, China has issued the plan of“Twelfth Five Year Plan”to encourage the development and utilization of new energy sources. The geothermal resource of China is relatively abundant, accounting for about 8% of the global. The equipment of power generation driven by geothermal is simple and the cost is low. Wherein the organic Rankine cycle(Organic Rankine Cycla, ORC) power generation technology is widely used as an effective way to recover low-grade heat source.On the basis of the research status of the low temperature power generation system, the ORC power generation system of geothermal water resource is studied deeply. By the analysis of the selection of the working substance and the parameters of the circulation, simultaneously, a system of practical operation conditions were simulation to predict the other operating conditions, which can guide or adjust the design and operating conditions. Graphical User Interface of system design and simulation were written to regulate the operation of the system.For environmental protection, this paper selected 19 kinds of working fluids at zero ODP and low GWP of HFCs and HCs classes. Based on the maximum net output power and thermal efficiency of cycle respectively, power performance of 12 kinds of dry and isentropic working fluid. Combined the two indexes, HFC245 fa is preferable to organic Rankine cycle power generation.Four variable conditions(variable mass flow and temperature of heat source and cooling water) were studied, analyzing cycle performance and parameters with four main parametres(evaporation and condensation temperature, superheat or subcooling degree, pinch temperature) to provide a reference for.system design. the conclusions as following:(1) Improving the flow and temperature of hot water can make the net output power of the cycle increase, and the change of the 4 parameters caused the change of the cycle output power.. The change of thermal efficiency of the cycle is not obvious, but increases with the rise of evaporation temperature, and drops with the increase of condensation temperature.(2) Enhancing the flow of cooling water can raise the net work of cycle, but the thermal efficiency is hardly affected, but obviously increases with the rise of evaporation temperature and condensation temperature, a small rise with the increase of the subcooling degree.(3) Reducing the temperature of the cooling water can make the circulating net output power increase, and the change of cycle efficiency is not evident. The improvement of thermal efficiency of the cycle depends mainly on the evaporation pressure and the condensation pressure of the internal parameters of the circulation.Finally, with matlab software for programming combination of REFPROP software, simulate the actual ORC generation system, and the simulation results of 500 W ORC generation system are compared with the experimental results, relative error in less than 20%. Based on this, a simulation of ORC 500 k W power generation system is established, whose component different from 500 W test system. In order to operate and visually see the results, the user interface of the ORC generation system and the user interface of the actual ORC power generation system are established.