RU2702682C1 - Installation for liquefied natural gas production and method of its operation - Google Patents

Installation for liquefied natural gas production and method of its operation Download PDF

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Publication number
RU2702682C1
RU2702682C1 RU2019111341A RU2019111341A RU2702682C1 RU 2702682 C1 RU2702682 C1 RU 2702682C1 RU 2019111341 A RU2019111341 A RU 2019111341A RU 2019111341 A RU2019111341 A RU 2019111341A RU 2702682 C1 RU2702682 C1 RU 2702682C1
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Russia
Prior art keywords
gas
heat exchanger
line
production
expander
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RU2019111341A
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Russian (ru)
Inventor
Андрей Владиславович Курочкин
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Андрей Владиславович Курочкин
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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. Disclosed group of inventions includes plant for production of liquefied natural gas and method of plant operation. At that, plant for production of liquefied natural gas includes gas drying and cleaning units, heat exchanger, separator, as well as expander and compressor, connected to each other, at that on production gas line compressor is arranged in series, refrigerator, first section of heat exchanger, cleaning unit, second section of heat exchanger, reducing device and separator equipped with LNG output line and return gas supply line to process gas line after expander, which form low pressure gas line, on which heat exchanger is located.EFFECT: simplified installation and increased output of LNG.2 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, 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, second expander, compressor, and separator.

During operation of the installation, high-pressure natural gas is drained and separated into a production and a process gas, the latter is cooled in a preliminary heat exchanger, reduced with an expander, heated in a “clean compressed production gas / reduced process gas” heat exchanger and mixed with the return gas supplied from the separator after heating mainly a heat exchanger, to produce a low pressure gas that is discharged after heating in a pre-heat exchanger and a compressed production gas / gas heat exchanger izkogo pressure. " The production gas is compressed, cooled in a “compressed production gas / low pressure gas heat exchanger”, purified in a purification unit, then cooled in a “purified compressed production gas / reduced process gas” heat exchanger and a main heat exchanger, reduced and separated into a separator for return gas and LNG . In this case, the expander (s) and the compressor are connected by electrical or kinematic connection.

The disadvantage of this installation and method is the complexity and low yield of LNG.

The objective of the invention is to simplify the installation and increase the yield of LNG.

The technical result is to simplify the installation due to the location of the preliminary heat exchanger after the expander, replacing the “compressed production gas / low pressure gas” heat exchanger with a refrigerator, and eliminating the “clean compressed production gas / reduced process gas” main heat exchanger and heat exchanger. An increase in LNG yield is achieved by lowering the temperature of the reduced production gas due to the optimization of heat transfer.

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, as well as an expander and a compressor connected to each other, a feature is that a compressor, a refrigerator, a first section are arranged in series on the production gas line a heat exchanger, a cleaning unit, a second section of a heat exchanger, a reducing device and a separator equipped with an LNG output line and a return gas supply line to the process gas line after the expander, which form a line of low pressure gas on which the heat exchanger is located.

The technical result is also achieved by the fact that in the known method, including drying and separating the gas into a process gas and production gas, which is compressed, cooled, refined, further cooled, reduced and separated in a separator for LNG and return gas, the process gas is reduced in an expander and mixed with the return gas to obtain a low pressure gas, which is removed after heating in the heat exchanger, in addition, the compressor is driven by the energy obtained by reducing the gas in the expander, l consists in the fact that the compressed production gas is cooled in the refrigerator and in the first section of the heat exchanger, cleaned, and further cooled in the second section of the heat exchanger.

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. 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 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 heat exchanger allows you to remove the heat released during compression of the production gas from the installation, lower its temperature and increase the LNG output. And the exclusion of the main heat exchanger and the “purified compressed production gas / reduced process gas” heat exchanger simplifies installation.

The installation includes dehydration units 1 and purification 2, a heat exchanger 3, a refrigerator 4, an expander 5, a reduction device 6 (the expander is conventionally shown), a compressor 7 and a separator 8. The dotted line shows the equipment of the dispatch unit: a reduction device 9, a separator 10, and a compressor 11.

During operation of the installation (Fig. 1), high-pressure gas is supplied via line 12 for drying to block 1 and separated into production gas and process gas, which is sent via line 13 for reduction to expander 5, mixed with the return gas supplied via line 14, obtained low pressure gas is heated in the heat exchanger 3 and removed via line 15. Production gas is supplied via line 16 for compression to the compressor 7, cooled in the refrigerator 4 and the first section of the heat exchanger 3, cleaned of carbon dioxide in block 2, cooled in the second section of the heat exchanger 3, reducedusing device 6 and is separated in the separator 8 into the LNG discharged through line 17 and the return gas, which is fed through line 14 to line 13. The dotted line shows the purge gas supply to block 2 along line 18 from line 16, and the regeneration gas supply from block 2 through line 19 to line 15, supplying an additional amount of energy to the compressor 7 via line 20, as well as lowering the LNG pressure by means of a reduction device 9, and separating the low pressure LNG in the separator 10 from line 21 and the separation gas, which compressed by compressor 12 and served on line 22 in line 14. A compound expander 5 and possibly 6 with a compressor 7 shown in broken lines.

The operability of the proposed installation and the method of its operation is confirmed by the following example: 10000 nm 3 / hour of natural gas composition (% vol.): Methane 96.64, ethane 1.79, propane 0.55, butanes and higher hydrocarbons 0.22, nitrogen 0 , 67, the rest of the carbon dioxide, at a pressure of 2.5 MPa and 20 ° C, is fed to the unit inlet and 1219 kg (16.4% by weight) of LNG and 8519 nm 3 / h of gas with a pressure of 0.6 MPa are obtained. In similar conditions, in the method of the prototype received 10.0% of the mass. LNG

Thus, the proposed installation is simpler, and the way it works allows you to increase the output of LNG, which shows the feasibility of their use in industry.

Claims (2)

1. Installation for producing liquefied natural gas, including gas drying and purification units, a heat exchanger, a separator, as well as an expander and a compressor connected to each other, characterized in that a compressor, a refrigerator, a first heat exchanger section, a purification unit are arranged in series on the production gas line , a second heat exchanger section, a reducing device and a separator equipped with an LNG output line and a return gas supply line to the process gas line after the expander, which form a low pressure gas line where the heat exchanger is located.
2. The method of operation of the installation according to claim 1, including drying and separating the gas into a process gas and production gas, which is compressed, cooled, purified, further cooled, reduced and separated in a separator for LNG and return gas, while the process gas is reduced in an expander and mixed with the return gas to obtain a low pressure gas, which is removed after heating in the heat exchanger, in addition, the compressor is driven by the energy obtained by reducing the gas in the expander, characterized in that the compressed production gas o they are cooled in the refrigerator and in the first section of the heat exchanger, cleaned, and further cooled in the second section of the heat exchanger.
RU2019111341A 2019-04-15 2019-04-15 Installation for liquefied natural gas production and method of its operation RU2702682C1 (en)

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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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