Geothermal Power Plant Technology
2017 275 kW Kaishan organic rankine cycle Screw Expander
Bernie and Connie Karl with Kaishan CEO Cao Kejian-Renewable Energy Fair ribbon cutting for the new 275kW screw expander. August 2017
2015 400kw kaishan Organic Rankine Cycle Screw expander
According to the geothermal conditions, single stage ORC power plant is used in this project. The capacity is 400kW and net output power is 312kW. Geothermal hot water flow into evaporator in the ORC system directly, and then pre-heater. Hot water heat R245fa into high temperature & high pressure vapor in the heat exchanger, after that the vapor will flow into screw expander, drive the expander to output mechanical energy and then drive the generator to output electric energy to the grid.
Considering that the local temperature is low and river water is available, water cooled condenser is chosen in this application to improve the thermal efficiency.
The whole unit is modularized package design using container size, which is continent to transport.
2006 400kW Organic rankine cycle units
The power plant is unique because it was designed to work using geothermal fluids at 165°F, which is a significantly lower temperature than that of the fluids used at other geothermal sites for commercial power generation. The United Technologies equipment is based on refrigeration components from its subsidiary company, Carrier Refrigeration. Originally designed for industrial waste heat applications, the power plant modules were and modified for this geothermal
application. In the winter, the units are air cooled or water cooled (via a cooling pond installed in 2008), and water cooled in the summer. This included the drilling of a geothermal production well, but it did not include any exploration costs. Those were partially covered under a Department of Energy grant. The project also used numerous recycled components including 4200 ft of pipeline and a 1.5 MWh UPS system, which reduced the cost of the project significantly.
