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- W1984034715 abstract "This paper describes various factors involved when exploitation of a geothermal field for electric power is being considered. Studies have been made which indicate that for condensing sets, steam turbine inlet pressures optimize at about 50 psig for the longest field life during which the reservoir is drawn down to the lowest usable pressure. This figure applies both for superheated steam reservoir and to pressurized hot water aquifers, and hence appears to be universally applicable, leading to the possibility of plant standardization with resultant lower costs and ease of maintenance. The feasibility of transmitting steam/water mixtures within long horizontal pipelines has been tested and found to have many advantages compared with the case where the water is first separated and then rejected at the wellheads, with the steam fraction only being transmitted over the same distance. In regions where the hot water contains very high amounts of dissolved chemicals, the possibility of deposition in such lines would have to be investigated - although any tendency is usually predictable from observation of the characteristics of the local boreholes. The non-condensable gas content of geothermal steam can be used to determine the optimum condenser pressure; the larger the gas concentration, the greater the specific steam rate required and the higher the pipeline cost, but the less the capital cost of the station equipment, hence high gas content inclines the design of the system towards small stations erected at borehole sites instead of central stations supplied by long pipelines. The economics of such small stations is very favourable: for instance, a powerful steam/water bore supplying a condenser-set, can generate electricity at as low as 0.2 cents/kWh which the scale of the rejected how water could reduce to a mere fraction of this figure. The greatest potential for development with regard to hot water fields is in employing this rejected hot water for industrial processes or space heating; every effort should now be directed towards attracting industries to utilise these wasted assets." @default.
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- W1984034715 date "1970-01-01" @default.
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- W1984034715 title "Power station strategy" @default.
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- W1984034715 doi "https://doi.org/10.1016/0375-6505(70)90497-9" @default.
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