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Analyses of mixed-hydrocarbon binary thermodynamic cycles for moderate-temperature geothermal resources using regeneration techniques

Technical Report ·
DOI:https://doi.org/10.2172/5281969· OSTI ID:5281969
;
Studies of basic binary geothermal cycles utilizing mixtures of hydrocarbons have shown better performance than for pure fluids for a moderate temperature (360/sup 0/F) resource. However, a loss is net geofluid effectiveness (watt-hours net plant output/1bm geofluid) results when the geofluid outlet temperature is limited to temperatures in excess of 160/sup 0/F to alleviate a silica precipitation problem. This study examined three working fluids consisting of binary mixtures of hydrocarbons to see if use of regenerative preheating techniques such as turbine exhaust recupation and/or turbine bleed could recover the loss in geofluid effectiveness for a 160/sup 0/F geofluid outlet temperature. Results showed that with the most promising of the three working fluids a turbine exhaust recuperator alone is sufficient to recover all the lost effectiveness while maintaining the geofluid outlet temperature at 160/sup 0/F. A brief study to investigate cold weather operation with that working fluid, and using the recuperator, showed no major detrimental response of the system; however, silica precipitation may present a problem in extremely cold weather, as the geofluid outlet temperature dropped below 160/sup 0/F for the lowest wet bulb temperatures studied.
Research Organization:
Idaho National Engineering Lab., Idaho Falls (USA)
DOE Contract Number:
AC07-76ID01570
OSTI ID:
5281969
Report Number(s):
EGG-GTH-5710; ON: DE82010259
Country of Publication:
United States
Language:
English

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Related Subjects

15 GEOTHERMAL ENERGY
150801* -- Geothermal Power Plants-- Design & Operation
2-METHYLBUTANE
2-METHYLPROPANE
ALKANES
BINARY-FLUID SYSTEMS
COMPARATIVE EVALUATIONS
DISPERSIONS
ENERGY SYSTEMS
FEDERAL REGION X
FLUIDS
GEOTHERMAL POWER PLANTS
Geothermal Legacy
HEPTANE
HEXANE
HYDROCARBONS
IDAHO
MIXTURES
NORTH AMERICA
OPERATION
ORGANIC COMPOUNDS
PERFORMANCE
POWER PLANTS
POWER RANGE 1-10 MW
PROPANE
RAFT RIVER VALLEY
THERMAL POWER PLANTS
USA
WORKING FLUIDS