Improvement of Condensing Equipment in ORC Geothermal Power Generation System

摘要

With the development of ORC geothermal generation technology, utilization of medium and low enthalpy geothermal resources has been on the rise. Condensing equipment plays an important role in the low-temperature ORC geothermal power generation system because it can provide a lower outlet pressure for the steam turbine and increase the power generation of the system. Due to the high energy consumption of the cooling water pump in traditional opening cooling tower, it leads to the decrease of power generation. So solving this problem has become the key to improve the power generation. In this paper, through the experiment and the simulation analysis of Huabei Oilfield geothermal power system found that the energy consumption of cooling water pump in traditional opening cooling tower is high. For this problem, this paper argues to replace the opening cooling tower (OCT) with closed wet cooling tower (CWCT). The model of OCT-ORC geothermal power generation system and CWCT-ORC geothermal power generation system are built by Engineering Equation Solver (EES). The energy consumption of two systems is compared when R123, R227ea, R245fa, R600, R600a are used as working fluids respectively. The effect of condensation temperature on power generation and the energy consumption of water pump are studied. The simulation results show that CWCT-ORC power generation system can greatly reduce the energy consumption of cooling water pump and its power generation is higher than OCT-ORC geothermal power generation system on the whole. But when the condensation temperature is too high, the CWCT is not applicable.