Proceedings of the 7th New Zealand Geothermal Workshop 1985. Design of Ohaaki power station separated water reinjection pumping system. New Zealand Geothermal Workshop [7, 6-8 Nov. 1985, New Zealand].

Brown, Duncan.

1985

CIENA
1067

0-86869-065-1

Ohaaki power station is under construction on Broadlands Geothermal Field, 20 km north of Wairakei. Limited water rights for the discharge of geothermal waters into surface waters, namely the Waikato River, were sought and granted. These have necessitated the design of reinjection systems for separated water and condensate which are the major quantities of geothermal fluid requiring disposal. The separated water reinjection system is the larger of the two systems and will be required to dispose 1500-1700 tonnes per hour of silica saturated water which has been separated from the production steam. The system consists of five similar pumping stations, each associated with a separation plant, seven reinjection wells and an interconnecting network of pipelines. In the paper, the design decisions taken in determining the required pumping station equipment based on problems associated with pumping silica saturated water, H2 S pollution of the environment and uncertainties in the fluid quantities and reinjection pressure are discussed. In addition, the proposed control of the reinjection system using electronic variable speed driven pumps is outlined. ABSTRACT. INTRODUCTION. SILICA SATURATION. SEPARATED WATER SEPARATION SYSTEM. SEPARATED WATER REINJECTION SYSTEM. REINJECTION PRESSURE. PUMPING STATION EQUIPMENT. Pump type. Drive or control type. PUMPING SYSTEM LAYOUT. SYSTEM ADOPTED. CONTROL OF THE SEPARATED WATER REINJECTION SYSTEM. ACKNOWLEDGEMENTS. REFERENCES.

NUEVA ZELANDIA; ENERGIA GEOTERMICA; PLANTAS GEOTERMICAS; SEPARADOR DE AGUAS; REINYECCION; DISEÑO TECNICO; GEOTERMIA;