مشخصات پژوهش

Extracting and utilizing geothermal resources are one of the efficient methods of low heat source power generation. If there is dry steam in the geothermal reservoir, high-temperature and high-pressure steam is extracted from the source and directly enters the turbine. If there is wet steam in the geothermal reservoir, at the first step the steam will be divided into saturated steam and saturated liquid by passing through a throttling valve and a separation chamber. The saturated steam passes through the turbine and produces power. The saturated liquid can run the lower power generation cycle if it has high enough pressure. The power production cycle, which includes the process of passing through the throttle valve and the separation chamber, is called the flashing cycle. The heat of the re-injected fluid into the ground is considered a lowtemperature heat source. Therefore, the flashing cycle can be improved with another cycle such as the ORC cycle. The combination of the two cycles results in the flash-binary cycle, which will show improved cycle performance. With the aim of this, two ORC cycle types are combined with a geothermal flash cycle. The working fluid of the ORC cycle is effective in increasing the overall efficiency. A heat exchanger inserted between the geothermal fluids entering the throttle valve and the saturated steam exiting the separation chamber can increase the inlet temperature of the turbine, the production work of the turbine, and the overall efficiency of the cycle. First, a normal flash-binary cycle has been selected and improved by using a heat exchanger, and the effect of this method on the performance of a combined cycle has been investigated. Also, the Organic Rankine cycle has been selected as the lower cycle, and the effect of the working fluid of the bottom ORC has been investigated. The results show that under the same considered conditions, the enhanced flash-binary integrated ORC with an internal heat exchanger using Butane as wo