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Date submitted2019-07-11
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Date accepted2019-09-11
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Date published2020-04-24
Research of lithium sorption by KU-2-8 cation exchanger from model solutions simulating geothermal fluids in the dynamic mode
- Authors:
- Tatiana P. Belova
- Tatiana I. Ratchina
The extraction of chemical compounds from hydromineral raw materials is currently a promising objective. The geothermal deposits in the Kamchatka Territory should be considered as possible sources of lithium, boron and other chemical compounds. Their economic efficiency is justified by the complexity of the use of resources of geothermal fluids. The article presents data obtained as a result of experimental studies of lithium sorption by KU-2-8 cation exchanger from model solutions that simulate geothermal fluids in the dynamic mode. It was shown that in the first phase of sorption, ion exchange results in the absorption of lithium and sodium ions by the hydrogen form of cation exchanger up to the degree of cation exchanger saturation by 78 %. After that, the displacement of lithium ions by sodium ions is observed. The intermediate solutions were obtained in which the molar ratio of Li/Na is 80 times higher than in the initial solution. To separate sodium and lithium, it is proposed to use the lithium form of cation exchanger obtained using a portion of lithium chloride concentrate. The separation occurs due to the displacement of lithium ions by sodium ions. The effluent has a molar ratio of Li/Na = 10.4. The regeneration is carried out with 1 n hydrochloric acid, while the concentration coefficient of sodium chloride equals three.
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Date submitted2016-11-01
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Date accepted2017-01-20
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Date published2017-04-14
Technology and economics of near-surface geothermal resources exploitation
- Authors:
- E. I. Boguslavskii
- V. V. Fitsak
The paper presents economic justification for applicability of near-surface geothermal installations in Luga region, based on results of techno-economic calculations as well as integrated technical and economic comparison of different prediction scenarios of heat supply, both conventional and using geothermal heat pumps (GHP). Construction costs of a near-surface geothermal system can exceed the costs of central heating by 50-100 %. However, operation and maintenance (O&M) costs of heat production for geothermal systems are 50-70 % lower than for conventional sources of heating. Currently this technology is very important, it is applied in various countries (USA, Germany, Japan, China etc.), and depending on the region both near-surface and deep boreholes are being used. World practice of near-surface geothermal systems application is reviewed in the paper.
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Date submitted2009-09-01
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Date accepted2009-11-09
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Date published2010-06-25
Thermal, power and economic parameters of innovative technology of development of nearsurface geothermal deposits
- Authors:
- E. I. Boguslavskiy
Deficiency of organic fuel and necessity of protection of environment cause growth of rates of development practically inexhaustible, everywhere widespread and ecologically pure geothermal resources. For needs of a heat supply especially actively developing innovative technology of development of near-surface geothermal resources has great value. Operative mining of the production schedules containing optimum parametres and indicators PSGT is necessary for designing and building of near-surface systems of a geothermal heat supply (PSGT). The imitating economic-mathematical model is developed, the algorithm and the program of their optimisation are created. Computer calculations for a wide range of natural, power and economic conditions are carried out. Key parametres and indicators PSGT are defined. Their optimum values for a heat supply of local consumers (apartment houses) in the conditions of the Yaroslavl area are recommended.
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Date submitted2009-09-28
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Date accepted2009-11-09
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Date published2010-06-25
Heatmasstransfer to nearsurface geothermal systems
- Authors:
- E. I. Boguslavskiy
- N. N. Smirnova
- S. V. Egorov
The paper is concerned with mathematical modeling of heat and mass transfer in subsurface geothermal systems. Heat exchanger is driven as a vertical channel in an impermeable rock massive. The temperature of rock is driven in accord with a usual thermal conductance equation on a cylinder coordinates basis. The boundary conditions between the rock and heat exchanger are given by the equality of a thermal flow.