RU2720506C1 - Plant for production of liquefied natural gas - Google Patents

Plant for production of liquefied natural gas Download PDF

Info

Publication number
RU2720506C1
RU2720506C1 RU2019111427A RU2019111427A RU2720506C1 RU 2720506 C1 RU2720506 C1 RU 2720506C1 RU 2019111427 A RU2019111427 A RU 2019111427A RU 2019111427 A RU2019111427 A RU 2019111427A RU 2720506 C1 RU2720506 C1 RU 2720506C1
Authority
RU
Russia
Prior art keywords
line
gas
expander
heat exchanger
gas line
Prior art date
Application number
RU2019111427A
Other languages
Russian (ru)
Inventor
Андрей Владиславович Курочкин
Original Assignee
Андрей Владиславович Курочкин
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Андрей Владиславович Курочкин filed Critical Андрей Владиславович Курочкин
Priority to RU2019111427A priority Critical patent/RU2720506C1/en
Application granted granted Critical
Publication of RU2720506C1 publication Critical patent/RU2720506C1/en

Links

Images

Classifications

    • 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: heat exchange; gas industry.
SUBSTANCE: disclosed is an apparatus for producing liquefied natural gas, comprising gas drying and cleaning units, a heat exchanger, a separator, a reducing device, as well as an expander and a compressor, connected to each other, where on the production gas line are successively arranged a first compressor, connected to an expander, a first cooler, first section of heat exchanger, cleaning unit, second section of heat exchanger, reducing device and separator, equipped with liquefied natural gas output line and return gas line, which is connected to process gas line after expander, with formation of low pressure gas line, on which heat exchanger is located, wherein on the process gas line a bypass line is made, on which the refrigerating machine is installed, and the low pressure gas line is connected to the process gas line to the expander with a circulating gas supply line, on which the second compressor and the second cooler are installed.
EFFECT: technical result is increased output of LNG due to optimization of heat exchange and provision of constant output due to equipping of unit 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, 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 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 is the low LNG yield due to imperfect heat transfer organization and uneven LNG output due to seasonal fluctuations in low-pressure gas extraction.

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 the constancy of the output by equipping the installation with a refrigeration machine and a circulation compressor.

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, the feature is that the first compressor is arranged in series on the production gas line, connected to the expander, a first refrigerator, a first heat exchanger section, a cleaning unit, a second heat exchanger section, a reducing device and a separator equipped with a liquefied natural gas outlet line a gas and a return gas line that is connected to the process gas line after the expander to form a low pressure gas line on which the heat exchanger is located, while a 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 a process gas line to the expander; a circulation gas supply line, on which a second compressor and a second refrigerator are installed.

As a reducing device, a reducing valve, gas-dynamic device, or expander can be installed. The first compressor is connected to the expander (s) via kinematic and / or electrical and / or magnetic and / or hydraulic coupling. Refrigerators can be made, for example, in the form of water or air cooling devices. 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 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 portion 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. The constant LNG output is ensured by the installation of a refrigeration machine on the bypass line of the process gas to lower the temperature of the latter before reduction, and, in addition, the installation of a second compressor and a second refrigerator on the circulating gas supply line, which allows maintaining the flow of process gas regardless of low-pressure gas extraction.

The installation includes dehydration units 1 and purification 2, heat exchanger 3, first 4 and second 5 refrigerators, expander 6, reduction device 7 (expander is conventionally shown), first 8 and second 9 compressors, separator 10 and refrigeration machine 11. The dotted line shows the equipment of the shipment unit : reducing device 12, the separator 13 and the compressor 14.

There can be three operating modes in the installation: winter, spring-autumn and summer. During operation of the installation (Fig. 1) in winter mode, with the maximum selection of low-pressure gas, valves 15-18 are closed and valve 19 is open, high-pressure natural gas entering line 20 is dried in block 1 and separated into production gas and the process gas, which is sent via line 21 to the expander 6, after reduction is mixed with the return gas supplied by line 22, and the resulting low pressure gas is heated in the heat exchanger 3 and removed via line 23. The production gas supplied through line 24 is compressed by compressor 8 cooled in 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 using the device 7 and separated in the separator 10 on the LNG output via line 25, and the return gas, which is fed through line 22 to line 21 The dotted line shows the supply of purge gas to block 2 on line 26 from line 24, the supply of regeneration gas from block 2 on line 27 to line 23, the supply of additional energy to compressor 7 on line 28, as well as the reduction of LNG pressure by means of a device 12, and separation in sep Rhatore 13 at low pressure LNG outputted along line 29, and separation gas which is compressed by the compressor 14 and fed through line 30 into line 22. A compound expander 6 and possibly 7 to the compressor 8 shown in dot-dash lines.

When operating in the spring-autumn mode, when the low-pressure gas extraction is reduced, with the valve 19 closed and the valves 15 and 16 open, the process gas is bypassed through the refrigeration machine 11 to lower the temperature and maintain the LNG output. In summer mode, with a significant decrease in low-pressure gas extraction, valves 17 and 18 are additionally opened and part of the low-pressure gas is recirculated from line 23 to line 21 using compressor 9 after cooling in the refrigerator 5.

Thus, the proposed installation allows 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, a heat exchanger, a separator, a reducing device, as well as an expander and a compressor connected to each other, characterized in that the first compressor connected to the expander, a first refrigerator, is 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, a reducing device and a separator equipped with a liquefied natural gas outlet line and a return gas line, which the second one is connected to the process gas line after the expander, with the formation of the low pressure gas line on which the 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 to the expander circulating gas supply, on which a second compressor and a second refrigerator are installed.
RU2019111427A 2019-04-15 2019-04-15 Plant for production of liquefied natural gas RU2720506C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2019111427A RU2720506C1 (en) 2019-04-15 2019-04-15 Plant for production of liquefied natural gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2019111427A RU2720506C1 (en) 2019-04-15 2019-04-15 Plant for production of liquefied natural gas

Publications (1)

Publication Number Publication Date
RU2720506C1 true RU2720506C1 (en) 2020-04-30

Family

ID=70553018

Family Applications (1)

Application Number Title Priority Date Filing Date
RU2019111427A RU2720506C1 (en) 2019-04-15 2019-04-15 Plant for production of liquefied natural gas

Country Status (1)

Country Link
RU (1) RU2720506C1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2412410C1 (en) * 2009-06-08 2011-02-20 Дочернее Открытое Акционерное Общество (ДОАО) "Оргэнергогаз" Liquefaction method of natural gas pumped from main gas line (versions)
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
RU2412410C1 (en) * 2009-06-08 2011-02-20 Дочернее Открытое Акционерное Общество (ДОАО) "Оргэнергогаз" Liquefaction method of natural gas pumped from main gas line (versions)

Similar Documents

Publication Publication Date Title
RU2315921C1 (en) Compression plant with great number of incoming flows
JP5006515B2 (en) Improved drive and compressor system for natural gas liquefaction
CN103582792B (en) Method for natural gas liquefaction
US7637122B2 (en) Apparatus for the liquefaction of a gas and methods relating to same
CN101743430B (en) Boil-off gas treatment process and system
US3780534A (en) Liquefaction of natural gas with product used as absorber purge
CN1206505C (en) Process for liquefying naturla gas by expansion cooling
US7231784B2 (en) Method for producing liquefied natural gas
EP0125980B1 (en) Process and apparatus for the cooling and liquefaction of at least a low boiling point gas, such as natural gas
ES2688165T3 (en) Apparatus for liquefaction of natural gas and related methods
RU2170894C2 (en) Method of separation of load in the course of stage-type cooling
RU2301384C2 (en) Method and device for liquefying natural gas
JP6140713B2 (en) Multiple nitrogen expansion process for LNG production
US6898949B2 (en) Method for refrigerating liquefied gas and installation therefor
RU2406949C2 (en) Method of liquefying natural gas
RU2141611C1 (en) Liquefaction method
KR100761973B1 (en) Natural gas liquefaction apparatus capable of controlling load change using flow control means of a working fluid
RU2382963C2 (en) Plant for cryogenic separation of mixture of gases, namely air
US7076971B2 (en) Method and installation for producing, in gaseous form and under high pressure, at least one fluid chosen from oxygen, argon and nitrogen by cryogenic distillation of air
RU2395765C2 (en) Plant and device for liquefaction of natural gas
RU2362099C2 (en) Method for cryogenic liquefaction/cooling and system for method realisation
CN103215093B (en) Miniature skid type nitrogen expansion natural gas liquefaction system and method thereof
DK178654B1 (en) Method and apparatus for continuousing a gascar carbon hydraulic current
US6131407A (en) Natural gas letdown liquefaction system
US4339253A (en) Method of and system for liquefying a gas with low boiling temperature