Application of new external cooling cycles in technological scheme of helium extraction and natural gas liquefaction
The paper presents the results of studying a combination of new technological solutions in the processes of natural gas liquefaction and helium extraction. The most common and effective way to ensure cooling capacity in the natural gas liquefaction process is to use a cascade cycle on mixed refrig...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Omsk State Technical University, Federal State Autonomous Educational Institution of Higher Education
2020-06-01
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| Series: | Омский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение" |
| Subjects: | |
| Online Access: | https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2020/%D0%A2.%204,%20%E2%84%96%202%20(%D0%90%D0%A0%D0%B8%D0%AD%D0%9C)/37-47%20%D0%9C%D0%B5%D1%85%D1%80%D0%BF%D1%83%D0%B9%D1%8F%20%D0%9C.,%20%D0%97%D0%B0%D0%B9%D1%86%D0%B5%D0%B2%20%D0%90.%20%D0%92.,%20%D0%9B%D0%B8%D1%81%D0%BE%D0%B2%D1%86%D0%BE%D0%B2%20%D0%90.%20%D0%9E..pdf |
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| Summary: | The paper presents the results of studying a combination of new technological solutions in the processes
of natural gas liquefaction and helium extraction. The most common and effective way to ensure cooling
capacity in the natural gas liquefaction process is to use a cascade cycle on mixed refrigerant (MFC)
as external cooling. The influence of introducing an absorption refrigeration unit on the technological
process has been studied. To extract helium, the combined separation and rectification method is
used. The purity of helium obtained is 50% (in moles). The running conditions of operation and the
corresponding technical characteristics of the devices are presented and described. The curves of the
resulting characteristics of heat exchangers indicate the correctness of the thermohydraulic calculations
performed. The relative value of energy costs for obtaining 1 kg of liquefied natural gas in a technological
process using MFC is 0,265 kWh/kg of LNG introducing an absorption refrigeration unit into the cycle
reduces the ratio presented to 0,1849 kWh/kg of LNG. In the process of extracting helium using an
absorption refrigeration unit gives the result of 0,951 and 132,9 kW/kmol of helium respectively.
When using an absorption refrigeration unit, the helium extraction rate and power consumption ratio
are 0,951 and 132,9 kW/kmol of helium, respectively. Application of the exergic analysis methods
to the processes under consideration shows that the greatest value of exergic losses relative to other
devices is observed in compressors. A detailed economic analysis has been carried out. It shows that
the cost of the product obtained in the normal MFC cycle and in the MFC cycle using an absorption
refrigeration machine is $0,1939 and $0,2069 per kg of LNG, respectively. Finally, on the basis of such
economic factors as the cost of electricity and the cost of the product, the efficiency of the new cycle
was analyzed |
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| ISSN: | 2588-0373 2587-764X |