Ormat: Low-Temperature Geothermal Power Generation

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Ormat: Low-Temperature Geothermal Power Generation ( ormat-low-temperature-geothermal-power-generation )

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Figure 3. NPR-3 recharge system. Madison produced water would be between 126 and 210 MBWPD (Table 1). The water resource in both the Tensleep and Madison formations are continuously re- charged from mountains to the west, Figure 3. Cur- rently, the hot water in the oil field is a waste stream and is treated through a series of treatment ponds and then discharged into an adjacent stream. DESCRIPTION OF THE CRADA In January 2007, Reno-based Ormat Nevada Inc., which develops and operates geothermal power plants in Nevada, California, and Hawaii, entered into a Coop- erative Research and Development Agreement (CRA- DA) with the U.S. Department of Energy to perform a validation of an Ormat organic Rankine cycle (ORC) power system to generate commercial electricity from hot water produced at a typical oil field. The purpose of the project, conducted at RMOTC, was to validate the premise that a binary geothermal power generation system that uses the hot water produced by an oil field can reliably generate commercial electricity. The pow- er system tested was an air-cooled, factory integrated, skid-mounted standard design Ormat ORC power plant similar to the standard design Ormat Energy Converter (OEC) installed at the Rogner Hotel in Austria. 2 Prior to installation of the power system, the hot wa- ter in the oil field was a waste stream and was treated through a series of treatment ponds and then discharged into an adjacent stream. The electricity produced from the unit described above was used to power field pro- duction equipment. The ORC power unit was intercon- nected into the field electrical system and the produced energy was metered and monitored for reliability and quality. Ormat supplied the ORC power unit while the DOE installed and operated the facility for a 12-month testing period. POWER GENERATION UNIT The unit was designed, constructed, and supplied by Ormat Nevada Inc. Design was based on Ormat’s ex- perience and operation of geothermal power plants in Nevada, California, Hawaii, and Austria. The purpose of the initial testing was to validate the premise that a bi- nary geothermal power generation system that uses the hot water produced during normal oilfield operations can reliably generate commercial electricity. Following are original design information and the performance expected. The resource was expected to be flowing at the inlet to the power unit at the relatively low temperature of 170 °F. At the design ambient tempera- Rocky Mountain Oilfield Testing Center This document may contain protected Cooperative Research and Development Agreement (CRADA) information and is not to be further disclosed for a period of 5 years from the date it was produced except as expressly provided for in the CRADA.

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