RU2701173C1 - Plant for production of liquefied natural gas - Google Patents

Plant for production of liquefied natural gas Download PDF

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Publication number
RU2701173C1
RU2701173C1 RU2019106379A RU2019106379A RU2701173C1 RU 2701173 C1 RU2701173 C1 RU 2701173C1 RU 2019106379 A RU2019106379 A RU 2019106379A RU 2019106379 A RU2019106379 A RU 2019106379A RU 2701173 C1 RU2701173 C1 RU 2701173C1
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Russia
Prior art keywords
line
heat exchanger
gas line
gas
compressor
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RU2019106379A
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Russian (ru)
Inventor
Андрей Владиславович Курочкин
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Андрей Владиславович Курочкин
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Priority to RU2019106379A priority Critical patent/RU2701173C1/en
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Publication of RU2701173C1 publication Critical patent/RU2701173C1/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 use of differential pressure between main and distribution pipelines. Claimed plant for liquefied natural gas production includes gas drying and cleaning units, preliminary and main heat exchangers, separator, first and second expanders and compressor, connected by means of electric and / or kinematic connection, at that on production gas line there are first compressor, first cooler, first section of preliminary heat exchanger, cleaning unit, second section of preliminary heat exchanger, main heat exchanger, first expander and separator equipped with LNG output line 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 preliminary heat exchanger is located, wherein the process gas line has a bypass line on which the refrigerating machine is mounted, and the low pressure gas line is connected to the process gas line by the circulating gas supply line, on which the second compressor and the second cooler are installed.
EFFECT: increased output of LNG due to optimization of heat exchange and provision of its constant due to equipment of installation with refrigerating machine and circulating compressor.
1 cl, 1 dwg

Description

The invention relates to cryogenic technology and can be used to produce liquefied natural gas (LNG) through the use of a pressure differential between the main and distribution pipelines.

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 and uneven output of LNG due to seasonal fluctuations in the selection of low-pressure gas, as well as due to imperfect organization of heat transfer.

The objective of the invention is to increase the yield of LNG and ensuring its constancy.

The technical result is to increase the output of LNG by optimizing heat transfer and ensuring its constancy by equipping the installation with a refrigeration machine and a circulation compressor.

The specified technical result is achieved by the fact that in the known installation, including gas drying and purification units, preliminary and main heat exchangers, a separator, first and second expanders and a compressor connected by electrical and / or kinematic connection, the feature is that on the production line the first compressor, the first refrigerator, the first section of the preliminary heat exchanger, the purification unit, the second section of the preliminary heat exchanger, the main heat exchanger are arranged in series k, the first expander and separator equipped with an LNG output 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 a bypass line is made on the process gas line on which the refrigeration machine is installed, and the low pressure gas line is connected to the process gas line by the circulation gas supply line on which the second compressor and W swarm refrigerator.

The first 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. Refrigerators can be made, for example, in the form of water or air cooling devices. The cleaning unit may include units for adsorption or absorption treatment for carbon dioxide. 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 process gas line after its reduction 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, the unit is additionally equipped with a shipping unit, including a reducing device, a separator and a compressor connected to the return gas line after the main heat exchanger.

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. A constant output of LNG ensures the installation of a refrigeration machine on the bypass line of the process gas to reduce the temperature of the latter before reduction, and, additionally, the installation of a second compressor and a second refrigerator on the supply line of circulating gas, which allows to increase the consumption of process gas.

The installation includes drying and cleaning units 2, preliminary 3 and main 4 heat exchangers, the first 5 and second 6 refrigerators, the first 7 and 8 second expanders, the first 9 and second 10 compressors, the separator 11 and the refrigeration machine 12. The dotted line shows the equipment of the shipment unit: reducing device 13, the separator 14 and the compressor 15.

There can be three operating modes in the installation: winter, spring-autumn and summer. When the installation (Fig. 1) is in winter mode, at the maximum low-pressure gas extraction, taps 16-19 are closed and the valve 20 is open, high-pressure natural gas coming through line 21 is drained in block 1 and separated into production gas and the process gas, which is sent via line 22 to the expander 8, after reduction is mixed with the return gas supplied via line 23, and the resulting low-pressure gas is heated in the heat exchanger 3 and removed via line 24. The production gas supplied through line 25 is compressed by the compressor 9 cooled in refrigerator 5 and the first section of the heat exchanger 3, is cleaned of carbon dioxide in the block 2, then cooled in the second section of the heat exchanger 3 and in the heat exchanger 4, reduced with the help of the expander 7 and separated in the separator 11 on the LNG output via line 26, and the return gas, which is through line 23 fed to line 22 after heating in the heat exchanger 4. The dotted line shows the supply of purge gas to block 2 on line 27 from line 24, the supply of regeneration gas from block 2 on line 28 to line 23, as well as the reduction of LNG pressure by means of a device 13, and separation in the separator 14 on LNG n viscous pressure outputted along line 29, and separation gas which is compressed by the compressor 15 and fed through line 30 into line 23. A compound expanders 7 and 8 of the compressor 9 shown in broken lines.

When operating in the spring-autumn mode, when the low-pressure gas extraction is reduced, when the valve 20 is closed and the valves 16 and 17 are open, the process gas is bypassed through the refrigeration machine 12 to lower the temperature and maintain the LNG output. In summer mode, with a significant decrease in low-pressure gas withdrawal, it decreases, valves 18 and 19 are additionally opened and part of the low-pressure gas is recirculated from line 24 to line 22 using compressor 10 and a refrigerator 6.

Thus, the proposed installation allows you to increase the output of LNG, ensures its constancy with seasonal changes in the selection of low pressure gas and can be used in industry.

Claims (1)

  1. Installation for the production of liquefied natural gas, including gas drying and purification units, preliminary and main heat exchangers, a separator, first and second expanders and a compressor connected by electrical and / or kinematic connection, characterized in that the first compressor is arranged in series on the production gas line, the first refrigerator, the first section of the preliminary heat exchanger, the cleaning unit, the second section of the preliminary heat exchanger, the main heat exchanger, the first expander and separator, equipped the LNG outlet line and the return gas line with the 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 the bypass line is installed on the process gas line, on which the refrigeration machine is installed, and the low pressure gas line is connected to the process gas line by a circulation gas supply line on which a second compressor and a second refrigerator are mounted.
RU2019106379A 2019-03-06 2019-03-06 Plant for production of liquefied natural gas RU2701173C1 (en)

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RU2019106379A RU2701173C1 (en) 2019-03-06 2019-03-06 Plant for production of liquefied natural gas

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RU2019106379A RU2701173C1 (en) 2019-03-06 2019-03-06 Plant for production of liquefied natural gas

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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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