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Raft River Geothermal Test Site

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Raft River Geothermal Test Site ( raft-river-geothermal-test-site )

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24 4. OPEBATING PROCEDURES A prerequisite for the acquisition of meaningful data for performance assessment of the vertical-fluted-tube condenser was proper operation of the prototype power plant. Procedures to accomplish this were developed as a combination of methods confirmed in earlier INEL experience with the plant and practices necessitated by system modification or particular test goals. 4.1 Routine Procedures Ingeneral, the routine procedures employed in the tests reported here were very similar to those used during previous operation of the prototype power plant. The s t a r t sequence from standby condition began with checking the status of a l l auxiliary systems and preparing the brine and cooling-water supply systems for operation. After ignition of the flare pilot, the cooling tower fan and the cooling-water pump were acti- vated, and the resulting flow adjusted t o a nominal value of 1.89 x m3/s (300 gpm). Next the isobutane boost and feed pumps were started with the associated flow initially bypassing the evaporator and returning to the sump in the bottom portion of the condenser shell, With the turbine isolated, a valve was opened slightly to begin hot brine feed to the evaporator. Then valves were adjusted to begin liquid isobutane feed to the evaporator and to reduce the complementary bypass flow. Brine and isobutane flows were increased gradually until the desired evaporator con- ditions were reached. When a l l plant systems were operating correctly, the cooling-water flow rate was adjusted to the desired test run value. If test plans called for turbine operation, the turbine outlet valve was then opened and the turbine inlet valve opened very slightly, allowing - a small flow of gas t o warm up the turbine and associated piping. Next, the turbine inlet valve was gradually opened to full-open position as the turbine bypass was restricted until fully ciosed. As the turbine acceler- ated t o operating speed, a clutch engaged t o connect the shaft t o the gen- erator for power production.

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