RU2702683C1 - Plant for production of liquefied natural gas - Google Patents

Plant for production of liquefied natural gas Download PDF

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Publication number
RU2702683C1
RU2702683C1 RU2019111343A RU2019111343A RU2702683C1 RU 2702683 C1 RU2702683 C1 RU 2702683C1 RU 2019111343 A RU2019111343 A RU 2019111343A RU 2019111343 A RU2019111343 A RU 2019111343A RU 2702683 C1 RU2702683 C1 RU 2702683C1
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RU
Russia
Prior art keywords
gas
gas line
heat exchanger
expander
line
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RU2019111343A
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Russian (ru)
Inventor
Андрей Владиславович Курочкин
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Андрей Владиславович Курочкин
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Priority to RU2019111343A priority Critical patent/RU2702683C1/en
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Publication of RU2702683C1 publication Critical patent/RU2702683C1/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. Claimed plant for production of liquefied natural gas includes gas drying and cleaning units, heat exchanger, separator, reducing device, as well as expander and compressor, connected to each other, at that on production gas line there are successively arranged compressor, refrigerator, first section of heat exchanger, a cleaning unit, a second heat exchanger section, an expander and a separator equipped with an LNG output line and a return gas line which is connected to the process gas line after the expander, forming a low pressure gas line on which the heat exchanger is located, note here that auxiliary cooler is arranged on process gas line upstream of expander and arranged on at least one auxiliary gas line with reduction device connected with high pressure gas line downstream of drying unit.
EFFECT: increased output 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 bleeding 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 drop 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, gas meter, a drying unit and a filter, a heat recovery line with a heat exchanger and 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, expander, compressor and separator.

The disadvantage of this installation and method is the low LNG yield 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, a heat exchanger, a separator, a reducing device, as well as an expander and a compressor connected to each other, a feature is that a compressor and a refrigerator are arranged in series on the production gas line , the first section of the heat exchanger, the cleaning unit, the second section of the heat exchanger, an expander and a separator equipped with an LNG output line and a return gas line that is connected to the process gas line follows the expander to form a low pressure gas line, on which the heat exchanger, while in the process gas line in front of the expander mounted auxiliary refrigerator disposed also on at least one auxiliary gas line with a reducing device connected to the high-pressure gas line after the drying unit.

Reducing valves, gas-dynamic devices or expanders can be installed as reducing devices. The compressor is connected to the expander (s) via kinematic and / or electrical and / or magnetic and / or hydraulic coupling. The refrigerator can be made, for example, in the form of an apparatus for water or air cooling. The cleaning unit may be performed, for example, in the form of a site for adsorption removal of 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. As a purge gas for adsorption purification, a part of the purified production gas can be used, 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. If you need to increase the output of LNG, the compressor drive is fed with additional energy.

The proposed scheme for cooling the compressed production gas in the refrigerator and in the heat exchanger allows you to remove the heat released from the compression of the production gas from the installation, lower its temperature and increase the LNG output. And the location of at least one auxiliary gas line connected to the high-pressure gas line and equipped with a reducing device and a process gas cooler allows several consumers to take gas at different pressures, and also, if necessary, use the auxiliary gas reduction energy to increase LNG output .

The installation includes drying and cleaning units 2, heat exchanger 3, refrigerator 4, auxiliary refrigerator 5, expander 6, reducing devices 7 and 8 (one auxiliary gas line and expanders are shown as reducing devices), compressor 9 and separator 10. Dotted line shows equipment of the shipment unit: reducing device 11, separator 12 and compressor 13.

During operation of the installation (Fig. 1), high-pressure natural gas entering line 14 is dried in block 1 and separated into production, process and auxiliary gas, which is reduced in device 8, heated in the refrigerator 5, and removed via line 15. Process gas line 16, after cooling in the refrigerator 5, is sent to the expander 6 and then mixed with the return gas supplied via line 17, the resulting low pressure gas is heated in the heat exchanger 3 and removed via line 18. The production gas supplied through line 19 is compressed by a compressor 9 , cooled in the refrigerator 4 and the first section of the heat exchanger 3, cleaned of carbon dioxide in the block 2, then cooled in the second section of the heat exchanger 3, reduced in the device 7 and separated in the separator 10 for LNG discharged through line 20, and the return gas, which is through line 17 served in line 16. The dotted line shows the supply of purge gas to block 2 on line 21 from line 19, the supply of regeneration gas from block 2 on line 22 to line 18, the supply of additional energy to compressor 9 on line 23, as well as the reduction of LNG pressure by reduction using device 1 1, and the separation in the separator 12 to low pressure LNG discharged through line 24, and the separation gas, which is compressed by compressor 13 and fed through line 25 to line 17. Connection of expander 6 and, possibly, reducing devices 7 and 8 when executed in in the form of expanders, with compressor 9 shown in dash-dotted lines.

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

Claims (1)

  1. Installation for the production of liquefied natural gas, including gas drying and purification units, a heat exchanger, a separator, a reducing device, as well as an expander and a compressor connected together, characterized in that a compressor, a refrigerator, a first heat exchanger section, are arranged in series on the production gas line purification, the second section of the heat exchanger, an expander and a separator equipped with a LNG output line and a return gas line, which is connected to the process gas line after the expander, forming a gas line -pressure in which is located a heat exchanger, the process gas line at the front mounted auxiliary refrigerator expander disposed also on at least one auxiliary gas line with a reducing device connected to the high-pressure gas line after the drying unit.
RU2019111343A 2019-04-15 2019-04-15 Plant for production of liquefied natural gas RU2702683C1 (en)

Priority Applications (1)

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RU2019111343A RU2702683C1 (en) 2019-04-15 2019-04-15 Plant for production of liquefied natural gas

Applications Claiming Priority (1)

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RU2019111343A RU2702683C1 (en) 2019-04-15 2019-04-15 Plant for production of liquefied natural gas

Publications (1)

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RU2702683C1 true RU2702683C1 (en) 2019-10-09

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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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