RU2699911C1 - Plant for producing lng - Google Patents

Plant for producing lng Download PDF

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Publication number
RU2699911C1
RU2699911C1 RU2019106378A RU2019106378A RU2699911C1 RU 2699911 C1 RU2699911 C1 RU 2699911C1 RU 2019106378 A RU2019106378 A RU 2019106378A RU 2019106378 A RU2019106378 A RU 2019106378A RU 2699911 C1 RU2699911 C1 RU 2699911C1
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RU
Russia
Prior art keywords
gas
heat exchanger
line
expander
gas line
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RU2019106378A
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Russian (ru)
Inventor
Андрей Владиславович Курочкин
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Андрей Владиславович Курочкин
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Priority to RU2019106378A priority Critical patent/RU2699911C1/en
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Publication of RU2699911C1 publication Critical patent/RU2699911C1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures

Abstract

FIELD: cryogenics.SUBSTANCE: invention relates to cryogenic equipment and can be used for production of liquefied natural gas (LNG) due to pressure difference between main and distribution pipelines during gas withdrawal by several consumers. Proposed LNG production unit includes gas drying and cleaning units, preliminary and main heat exchangers, separator and compressor connected by means of electric and / or kinematic connection, wherein on the production gas line the compressor, refrigerator, the first section of the preliminary heat exchanger, the cleaning unit, second section of preliminary heat exchanger, main heat exchanger, first expander and separator equipped with output line LNG and return gas line with main heat exchanger, which is connected to process gas line after second expander, forming low pressure gas line, on which the preliminary heat exchanger is located, at that on the process gas line before the second expander there is an auxiliary cooler located also on at least one line of auxiliary gas with the expander connected to the high pressure gas line after the drying unit.EFFECT: increased yield of LNG due to reduced temperature of reduced production gas by optimization of heat exchange and possibility of gas withdrawal by several consumers at different pressures due to installation of auxiliary gas bleed lines.1 cl, 1 dwg

Description

The invention relates to cryogenic technology and can be used to produce liquefied natural gas (LNG) due to the pressure difference between the main and distribution pipelines during the selection of gas by several consumers.

A known method for the production of liquefied natural gas and a complex for its implementation [RU 2541360, publ. 02.10.2015, IPC F25J 1/00], which includes a natural gas inlet line with a dust filter, a gas meter, a drying unit and a filter, a heat recovery line with a heat exchanger and a pressure regulator, a jet compressor, an outlet gas meter, a gas purification unit with a filter, as well as a preliminary heat exchanger, an expander-compressor unit with auxiliary systems, a main heat exchanger, a throttle, a separator and an LNG storage with a cryogenic pump.

The disadvantages of the known complex is the low LNG yield due to the irrational consumption of energy for reducing the process gas stream.

Closest to the proposed invention, the installation of liquefaction of natural gas and the method of its operation (options) [RU 2671665, publ. November 6, 2018, IPC F25J 1/00], in one of the options including gas drying and purification units, heat exchangers: preliminary, main, “compressed production gas / low pressure gas” and “purified compressed production gas / reduced process gas” , reducing device (first expander), second expander, compressor and separator.

The disadvantage of this installation is the low LNG output and the inability to select gas by several consumers at different gas pressures.

The objective of the invention is to increase the yield of LNG and the ability to select gas by several consumers at different pressures.

The technical result is to increase the LNG yield by lowering the temperature of the reduced production gas by optimizing heat transfer and the possibility of gas extraction by several consumers at different pressures due to the installation of auxiliary gas extraction lines.

The specified technical result is achieved by the fact that in a known installation, including gas drying and purification units, preliminary and main heat exchangers, a separator, expanders and a compressor connected by electrical and / or kinematic connection, the feature is that the production gas lines are arranged in series compressor, refrigerator, first section of the preliminary heat exchanger, cleaning unit, second section of the preliminary heat exchanger, main heat exchanger, first expander and separator equipped with a LNG outlet line and a return gas line with a main heat exchanger, which is connected to the process gas line after the second expander, forming a low pressure gas line on which the preliminary heat exchanger is located, while an auxiliary refrigerator is installed on the process gas line in front of the second expander, also located on at least one auxiliary gas line with an expander connected to the high pressure gas line after the drying unit.

The compressor can be connected to the expanders both kinematically and electrically, by means of an electric motor powered by electric generators connected to the expanders. The refrigerator can be made, for example, in the form of an apparatus for water or air cooling. The cleaning unit may include units for adsorption or absorption treatment for carbon dioxide. Through the auxiliary gas lines, gas is drawn at a pressure different from the pressure of the low pressure gas. As the remaining elements of the installation can be placed any device of the corresponding purpose, known from the prior art.

Prevention of the deposition of solid carbon dioxide in the reduced process gas line is achieved, for example, due to the high speed and / or turbulization of the gas flow, and in the preliminary heat exchanger due to its execution in the form of a multi-section apparatus with the possibility of periodic shutdown of sections for their heating. In gas adsorption purification, part of the purified production gas can be used as purge gas, and the regeneration gas can be directed to the low pressure gas line. If it is necessary to ship LNG at a lower pressure than its storage pressure, LNG is reduced and separated, directing the obtained LNG to low pressure for shipment, and the separation gas after compression is sent to the return gas line.

The proposed scheme for cooling the compressed production gas first in the refrigerator and then in the preliminary heat exchanger allows increasing the capacity of the main heat exchanger operating at lower temperatures, thereby increasing the heat transfer efficiency, lowering the temperature of the reduced production gas and increasing the LNG yield. And the location of at least one auxiliary gas line connected to the high-pressure gas line and equipped with an expander and a process gas refrigerator allows several consumers to take gas at different pressures, as well as use the auxiliary gas reduction energy to increase LNG output.

The installation includes drying and cleaning units 2, preliminary 3 and main 4 heat exchangers, a refrigerator 5, an auxiliary refrigerator 6, expanders 7-9 (one auxiliary gas line is conventionally shown), a compressor 10 and a separator 11. The dotted line shows the equipment of the dispatch unit: a reducing device 12, a separator 13 and a compressor 14.

During operation of the installation (Fig. 1), high-pressure natural gas entering line 15 is dried in block 1 and separated into production, process, and auxiliary gas, which is reduced in expander 9, heated in the refrigerator 6, and removed via line 16. Process gas line 17, after cooling in the refrigerator 6, is sent to the expander 8, and after reduction is mixed with the return gas supplied via line 18, the resulting low pressure gas is heated in the heat exchanger 3 and removed via line 19. The production gas supplied through line 20 is compressedcompressor 10, cooled in the refrigerator 5 and the first section of the heat exchanger 3, cleaned of carbon dioxide in block 2, then cooled in the second section of the heat exchanger 3 and in the heat exchanger 4, reduced with the help of expander 7 and separated in the separator 11 to the LNG output via line 21, and return gas, which is supplied through lines 18 to line 17 after heating in the heat exchanger 4. The dashed line shows the supply of purge gas to block 2 via line 22 from line 20, the regeneration gas from block 2 through line 23 to line 19, as well as pressure reduction LNG by reduction using a device CTBA 12 and the separation in the separator 13 on the low pressure LNG outputted along line 24, and separation gas which is compressed by the compressor 14 and fed through line 25 into line 18. A compound 7-9 expander with a compressor 10 is shown in broken lines.

Thus, the proposed installation allows you to increase the output of LNG, allows the selection of gas by several consumers at different pressures and can be used in industry.

Claims (1)

  1. LNG generation plant, including gas drying and purification units, preliminary and main heat exchangers, a separator and a compressor connected by electrical and / or kinematic connection, characterized in that a compressor, a refrigerator, a first section of the preliminary heat exchanger are arranged in series on the production gas line purification, the second section of the preliminary heat exchanger, the main heat exchanger, the first expander and separator equipped with an LNG output line and a return gas line with the main heat exchanger a heat exchanger, which is connected to the process gas line after the second expander, forming a low pressure gas line on which the preliminary heat exchanger is located, while an auxiliary refrigerator is installed on the process gas line in front of the second expander, also located on at least one auxiliary gas line with the expander, connected to the high pressure gas line after the drying unit.
RU2019106378A 2019-03-06 2019-03-06 Plant for producing lng RU2699911C1 (en)

Priority Applications (1)

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RU2019106378A RU2699911C1 (en) 2019-03-06 2019-03-06 Plant for producing lng

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RU2019106378A RU2699911C1 (en) 2019-03-06 2019-03-06 Plant for producing lng

Publications (1)

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RU2699911C1 true RU2699911C1 (en) 2019-09-11

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2395765C2 (en) * 2005-02-17 2010-07-27 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Plant and device for liquefaction of natural gas
RU2438081C2 (en) * 2007-07-04 2011-12-27 Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" ( ООО" Газпром ВНИИГАЗ " ) Procedure for liquefaction of natural gas (versions) and installation for its implementation (versions)
RU2541360C1 (en) * 2014-02-20 2015-02-10 Общество с ограниченной ответственностью "Газпром трансгаз Екатеринбург" Liquefied natural gas production method and complex for its implementation
US9003828B2 (en) * 2007-07-09 2015-04-14 Lng Technology Pty Ltd Method and system for production of liquid natural gas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2395765C2 (en) * 2005-02-17 2010-07-27 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Plant and device for liquefaction of natural gas
RU2438081C2 (en) * 2007-07-04 2011-12-27 Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" ( ООО" Газпром ВНИИГАЗ " ) Procedure for liquefaction of natural gas (versions) and installation for its implementation (versions)
US9003828B2 (en) * 2007-07-09 2015-04-14 Lng Technology Pty Ltd Method and system for production of liquid natural gas
RU2541360C1 (en) * 2014-02-20 2015-02-10 Общество с ограниченной ответственностью "Газпром трансгаз Екатеринбург" Liquefied natural gas production method and complex for its implementation

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