Preliminary analysis of single flash combined with binary system using thermodynamic assessment: a case study of Dieng geothermal power plant

The present work investigates thermodynamic optimum conditions with respect to resource utilization by varying the operating pressure of flash drum for an existing geothermal power plant. The main focus of the study is to maximize the power output by minimizing the waste of liquid geothermal fluid re-injected to the well. For this purpose a double-flash system has been incorporated and the effect of operating at optimum flash pressures for both primary and secondary flash units is studied. An economic model is developed that calculates the total capital investment based on the cost of major equipments including pumps, flash drums, turbine generators, and condensers. From the results obtained it can be concluded that the plant at Svartsengi currently is working close to the optimum flashing pressure for the single-flash geothermal power plant. Providing an additional flash unit to convert the high temperature liquid coming from primary flash for Svartsengi and Nevada power plants increases the net power output by 12.7% and 28.9% respectively.

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Case Study of the Puna Geothermal Power Plant and Proposed Retrofit H2S Gas Mitigation Strategies

ASME 2020 14th International Conference on Energy Sustainability ◽

10.1115/es2020-1601 ◽

2020 ◽

Author(s):

Kevin R. Anderson ◽

Wael Yassine

Keyword(s):

Power Plant ◽

Power Plants ◽

State Of The Art ◽

Mitigation Strategies ◽

Geothermal Power Plant ◽

Current State ◽

Abatement Strategies ◽

Simulation Results ◽

Geothermal Power

Abstract This paper presents modeling of the Puna Geothermal Venture as a case study in understanding how the technology of geothermal can by successfully implemented. The paper presents a review of the Puna Geothermal Venture specifications, followed by simulation results carried out using NREL SAM and RETSCREEN analysis tools in order to quantify the pertinent metrics associated with the geothermal powerplant by retrofitting its current capacity of 30 MW to 60 MW. The paper closes with a review of current state-of-the art H2S abatement strategies for geothermal power plants, and presents an outline of how these technologies can be implemented at the Puna Geothermal Venture.

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Performance improvement of drysteam geothermal power plant by employing bottoming binary system

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/249/1/012022 ◽

2019 ◽

Vol 249 ◽

pp. 012022

Author(s):

Nova Dany Setyawan ◽

Nugroho Agung Pambudi ◽

Frandhoni Utomo ◽

Lip Huat Saw ◽

Mert Gürtürk ◽

...

Keyword(s):

Power Plant ◽

Binary System ◽

Performance Improvement ◽

Geothermal Power Plant ◽

Geothermal Power

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Retrofitting a Geothermal Power Plant to Optimize Performance: A Case Study

Journal of Energy Resources Technology ◽

10.1115/1.2795996 ◽

1999 ◽

Vol 121 (4) ◽

pp. 295-301 ◽

Cited By ~ 29

Author(s):

M. Kanog˘lu ◽

Y. A. C¸engel

Keyword(s):

Power Plant ◽

Power Output ◽

Operating Conditions ◽

Optimum Operating ◽

Geothermal Power Plant ◽

Northern Nevada ◽

Single Flash ◽

Geothermal Power ◽

Net Power Output ◽

Double Flash

Performance evaluation of a 12.8-MW single-flash design geothermal power plant in Northern Nevada is conducted using actual plant operating data, and potential improvement sites are identified. The unused geothermal brine reinjected back to the ground is determined to represent about 50 percent of the energy and 40 percent of the exergy available in the reservoir. The first and second-law efficiencies of the plant are determined to be 6 percent and 22 percent, respectively. Optimizing the existing single-flash system is shown to increase the net power output by up to 4 percent. Some well-known geothermal power generation technologies including double-flash, binary, and combined flash/binary designs as alternative to the existing system are evaluated and their optimum operating conditions are determined. It is found that a double-flash design, a binary design, and a combined flash/binary design can increase the net power output by up to 31 percent, 35 percent, and 54 percent, respectively, at optimum operating conditions. An economic comparison of these designs appears to favor the combined flash/binary design, followed by the double-flash design.

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