Compound hybrid geothermal-fossil power plants: thermodynamic analyses and site-specific applications

Technical Report · Fri Jun 01 00:00:00 EDT 1979

DOI:https://doi.org/10.2172/5672251· OSTI ID:5672251

DiPippo, R; Avelar, E M

The analysis of hybrid fossil-geothermal power plants is extended to compound hybrid systems which combine the features of previously analyzed systems: the geothermal-preheat and the fossil-superheat systems. Compound systems of the one- and two-stage type are considered. A compilation of working formulae from earlier studies is included for completeness. Results are given for parametric analyses of compound hybrid plants. System performance was determined for wellhead conditions of 150, 200, and 250/sup 0/C, and for steam fractions of 10, 20, 30, and 40%. For two-stage systems an additional cycle variable, the hot water flash fraction, was varied from 0 to 100% in increments of 25%. From the viewpoint of thermodynamics, compound hybrid plants are superior to individual all-geothermal and all-fossil plants, and are shown to have certain advantages over basic geothermal-preheat and fossil-superheat hybrid plants. The flexibility of compound hybrid systems is illustrated by showing how such plants might be used at six geothermal sites in the western United States. The question of the optimum match between the energy resources and the power plant is addressed, and an analysis given for a hypothetical geothermal resource.

• Research Organization: Brown Univ., Providence, RI (USA). Div. of Engineering; Southeastern Massachusetts Univ., North Dartmouth (USA)
• DOE Contract Number: EY-76-S-02-4051
• OSTI ID: 5672251
• Report Number(s): COO-4051-44
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
20 FOSSIL-FUELED POWER PLANTS
FOSSIL-FUEL POWER PLANTS
HYBRID SYSTEMS
GEOTHERMAL POWER PLANTS
COMPUTER CODES
DESIGN
FEEDWATER
OPTIMIZATION
PARAMETRIC ANALYSIS
PERFORMANCE
SUPERHEATING
THERMODYNAMICS
WELL TEMPERATURE
WELLHEADS
WESTERN REGION
HEATING
HYDROGEN COMPOUNDS
NORTH AMERICA
OXYGEN COMPOUNDS
POWER PLANTS
RESERVOIR TEMPERATURE
THERMAL POWER PLANTS
USA
WATER
Geothermal Legacy