Page 59 - ITA Journal 3-2018

Technical Papers
15-stage ex pump
BINE reports further improve- ments: pressure relief valves protect new bellow-type seals, designed to ensure safe pressure compensation. The mechanical shaft seals were also improved. A new high temperature meas- urement sensor also had to be developed. Should the motor short circuit, the sensor electron- ics need to be protected from up to 8 kV. The development process resulted in a newly designed 15-stage ex pump. It was rst usedintheOberhachinggeother- mal power plant. The pump can ef ciently handle varying pump volumes, reaching an ef ciency level of 80%.
Additional improvements were also made in the form of a new medium voltage frequency con- verter for a higher operating voltage, improved design of the operating parameters and a prog- nostic concept for preventive maintenance and repair works, adds BINE. Development of core components continued to achieve series production in 2017.
Reinjection, condensate and cooling water pumps
KSB also sees geothermal power as a source with “practically endless potential.” Needless to say, there is also lots of poten- tial for pumps. As the company knows to report, numerous valve types are used in geothermal plants, where geothermal water can reach temperatures of up to 250° Celsius. Pumps include rein- jection pumps, “which return the cooled geothermal water back underground,” condensate pumps, “builtfrommaterialsabletowith- stand the mineral-rich geothermal water,” as well as cooling water pumps, “that have already proven their worth in many conventional power plants”.
A variety of pumps is also required for binary geothermal plants with water temperatures of up to 180 °C. Such plants transfer heat to a second cycle, either a so-called organic rankine cycle (ORC), or a Kalina cycle. The plant uses media which turn to steam and drive a turbine, explains the pump man- ufacturer.
Pumps for binary cycle geothermal plants
“Special feed pumps are used to circulate uids such as isobutane, isopentenyl, or water-ammonia mixes in this cycle,” states KSB. Circulating pumps can use residual heat for district heating, whereas reinjection pumps feed the cooled thermal water back below the ground. The second cycle isn’t needed if a heat exchanger is used to directly pump heat into a district heating grid, or is used in industrial processes.
Such pumps are necessary to enable the energy transforma- tion also in the heat market. The Munich City Utilities (SWM) are highly engaged in the heat market, and are developing a vision for district heating: “By 2040, Munich is to become the rst major city in Germany where district heat will be produced to 100% from renewable sources of energy. Geothermal heat will con- tribute signi cantly to eco-heat,” underscores SWM.
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ITAtube Journal No3/October 2018
59