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Assessment of the Costs of Geothermal Power Generation in New Zealand B.1.3 Double pressure, condensing steam plant This is similar to a single pressure condensing steam turbine, but uses two stage separation of the geothermal fluids, resulting in two steam admission pressures at the turbine. The first separation pressure will be higher than for single flash, leaving a greater proportion of first flash liquid. This liquid is then flashed at a lower pressure (much lower than for single flash) and the resultant steam is separated by second stage separation. This type of plant is generally used when the resource can produce medium enthalpy fluids at relatively high wellhead pressures. This enables the primary flash to be undertaken at relatively high pressure, providing steam at high enthalpy to the turbine, with the secondary flash permitting additional steam to be produced from the fluid separated in the primary separator. Very occasionally triple flash systems are used (such as at Nga Awa Purua). There are not many examples of double flash systems world-wide, but they have been used successfully for more than fifty years. The technology is well understood and it involves only an additional steam inlet part way down the steam turbine, for which there are many non-geothermal examples world-wide. A schematic diagram of a double flash steam turbine power cycle is show in Figure B-2. The key point to note beyond those already noted for single flash condensing steam turbine cycle, is that the turbine has two steam admission pressures. Figure B-2 Double pressure (double flash), condensing steam turbine plant Sinclair Knight Merz SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 72PDF Image | Current Costs of Geothermal Power Generation in New Zealand
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