Research of a new shell and tube heat exchanger for use in geothermal heating systems
DOI:
https://doi.org/10.31548/energiya2019.05.087Abstract
Abstract. Geothermal resources are virtually inexhaustible, environmentally friendly source of renewable energy. There are large reserves of hot thermal waters, which are practically not used for the needs of thermal power in Ukraine. The vast majority of geothermal deposits are highly mineralized in Ukraine, where the content of mineral compounds in groundwater exceeds 40 g/l, and in some deposits reaches 150 - 300 g/l. Considering the environmental aspect, the only acceptable use of such waters is the creation of geothermal circulation systems with re-injection of the spent geothermal fluid into the aquifer. One of the technical problems that prevent the widespread use of technology for extracting thermal energy from heated highly mineralized brines is the intensive deposition of salts in heat exchange equipment. The negative effect of the salt deposition process on the heat exchange surface is an increase of thermal resistance, which leads to a deterioration in the thermal characteristics of the heat exchanger. An effective way to solve the problem of scaling in heat exchangers designed for operation in geothermal heat supply systems is the use of tubular heat exchangers with corrugated tubes that can significantly reduce the salt deposition rate on the heat exchange surfaces and simultaneously intensify heat transfer due to simulated turbulization of the near-wall heat carrier flow. The research was carried out and the promising design of a downhole heat exchanger in which thin-walled flexible stainless corrugated tubes used with the ability to work with highly mineralized solutions (298 g/l) as heat exchange elements was proposed by the IET of the National Academy of Sciences of Ukraine. As experiments show, the use of heat exchangers based on corrugated tubes in geothermal heat supply systems will ensure the long-term operation of heat exchangers without additional measures to clean the surfaces.
Key words: shell and tube heat exchanger, corrugated tubes, heat transfer coefficient, geothermal fluid, salt deposition
References
Mazorenko, D. I., Tsapko, V. H., Honcharov, F. I. (2006). Inzhenerna ekolohiia silskohospodarskoho vyrobnytstva [Engineering ecology of agricultural production]. Kyiv: Znannia, 376.
Yatsyk, A. B., Byshovets, L. V., Tomiltseva, A. Z., Cherniavska, A. B., Zapolskyi, I. D. (2008). Ekolohichni problemy verkhiv'ia Kanivskoho vodoskhovyshcha [Environmental problems in the upper reaches of the Kaniv Reservoir]. Vodne hospodarstvo, 4, 31 - 36.
Yatsyk, A. V., Tomiltseva, A.I ., Dupliak, V. D. (2011). Kontseptsiia vporiadkuvannia vykorystannia ta okhorony vodnykh resursiv u zaplavi r. Dnipro vid hyrla r. Desna do hyrla r. Stuhna [The concept of streamlining the use and protection of water resources in the Dnieper floodplain from the Desna river mouth to the Stugna river mouth]. Kyiv: Universytet «Ukraina», 27.
Vertay, S. P., Shtepa, V. N. (2016). Obosnovaniye struktury i zadaniy sistemy podderzhki prinyatiya resheniy obobshchënnoy otsenki perspektivnosti innovatsionnykh tekhnologiy [Substantiation of the structure and tasks of the decision support system for a generalized assessment of the prospects of innovative technologies]. Naukoviy vіsnik Natsіonal'nogo unіversitetu bіoresursіv і prirodokoristuvannya Ukraїni. Serіya : Tekhnіka ta energetika APK, 240, 86-93.
Available at: http://env-approx.org/images/documents/201/Osiyskiy_Scobley.pdf
Shtepa, V. M., Honcharov, F. I., Cyrovatka, M. A. (161). Obhruntuvannia ta rozrobka kryteriiu enerhoefektyvnosti funktsionuvannia elektrotekhnolohichnykh system vodopidhotovky [Substantiation and development of the criterion of energy efficiency of functioning of electrotechnological systems of water treatment]. Naukovyi visnyk Natsionalnoho universytetu bioresursiv i pryrodokorystuvannia Ukrainy. Seriia: Tekhnika ta enerhetyka APK, 161, 187-193.
Shtepa, V. M. (2018). Obhruntuvannia robochoi miry efektyvnosti elektrotekhnolohichnoi vodoochystky [Justification of the working measure of the efficiency of electrotechnical water purification]. Enerhetyka i avtomatyka, 4, 99-111.
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