Thin-Film Steam Generators of Binary Geothermal Power Plants

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Abstract

BACKGROUND: The cost of electricity generated by a geothermal power plant is twice as low as that of energy sources. However, at present, geothermal power plants mainly use submersible-type apparatus, and the most promising thin-film steam generators have not been sufficiently investigated.

AIM: The purpose of this work is to show the advantages of a thin–film steam generator in comparison with an immersion type heat exchanger.

MATERIALS AND METHODS: The basis for this publication is the experimental research of the author and the analysis of data cited in the literature on heat exchange during the boiling of a film irrigating a bundle of finned pipes.

CONCLUSIONS: The use of thin-film steam generators will significantly reduce the amount of expensive refrigerant in a geothermal power plant circuit. With a cocurrent flow of steam and liquid, the ingress of large drops onto the surface of a superheater tubes is excluded. The use of finned tubes in a bundle with optimal finning parameters ensures a uniform irrigation. The artificial centers of vaporization of the finned tube repeatedly intensify the heat transfer during film boiling, which ultimately leads to a reduction in the weight and dimensions of the superheater.

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About the authors

Ivan I. Gogonin

Kutateladze Institute of Thermophysics of SB RAS

Author for correspondence.
Email: gogonin@itp.nsc.ru
ORCID iD: 0000-0001-8914-5860

Dr. Sci. (Tech), Prof., Principal Researcher

Russian Federation, Novosibirsk

References

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Supplementary files

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2. Fig. 1. Drops of liquid on the turbine blades of the first freon power plant (photo by Yu.M. Petin).

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3. Fig. 2a. Film flow on a bundle of smooth horizontal pipes (photo by Maltsev).

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4. Fig. 2b. Uniform irrigation of the tube bundle and capillary fluid retention between the fins. ā=0,75; Re1=1000. Liquid flooding of the intercostal cavity in the lower part of the finned cylinder.

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5. Fig. 3. q – ∆t dependence on the evaporation and boiling of the film. R-21; Re1=1000; ТS=40°C; 1 - smooth pipe; 2 – ribbed pipe, RZ=3–5 µm; 3 – ribbed pipe RZ = 20–30 µm.

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6. Fig. 4. q – ∆t dependence R-21; ТS=40°C: 1 – smooth pipe Re=600; 2 – Re=1500; 3 – ribbed pipe RZ=20–30 µm , Re=600; 4 – Re=1500.

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7. Fig. 5. Schematic diagram of a steam generator with a cocurrent steam and film flow. 1 - liquid distributor; 2 - package of pipes; 3 - superheater; 4 - steam outlet.

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