RU2686655C1 - Plant for production of liquefied natural gas (versions) - Google Patents

Plant for production of liquefied natural gas (versions) Download PDF

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Publication number
RU2686655C1
RU2686655C1 RU2018137518A RU2018137518A RU2686655C1 RU 2686655 C1 RU2686655 C1 RU 2686655C1 RU 2018137518 A RU2018137518 A RU 2018137518A RU 2018137518 A RU2018137518 A RU 2018137518A RU 2686655 C1 RU2686655 C1 RU 2686655C1
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RU
Russia
Prior art keywords
gas
heat exchanger
line
gas line
production
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RU2018137518A
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Russian (ru)
Inventor
Андрей Владиславович Курочкин
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Андрей Владиславович Курочкин
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Priority to RU2018137518A priority Critical patent/RU2686655C1/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
    • 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
    • F25J1/0002Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022Hydrocarbons, e.g. natural gas

Abstract

FIELD: cryogenics.
SUBSTANCE: invention relates to cryogenic equipment and can be used for production of liquefied natural gas at gas distribution stations. Proposed plant comprises high-pressure line including desiccation unit to be separated into production gas line and process gas line. Process gas line is equipped with a preliminary heat exchanger and an expander and is connected to a return gas line forming a low pressure gas line. Production flow line is equipped with compressor connected with expander, cleaning unit, main heat exchanger, reducing device and separator with lines of return gas and LNG drain. Heat exchanger "liquefied natural gas/low pressure gas" is installed on the line of compressed production gas. After the cleaning unit the heat exchanger "clean liquefied natural gas/reduced process gas" is arranged, after which the process gas line is connected to the reverse gas line after the main heat exchanger. Expander is arranged as reducing device and connected with compressor. According to the second version of the invention, a refrigerator is installed on the compressed production gas line.
EFFECT: increased yield of liquefied natural gas.
2 cl, 2 dwg

Description

The invention relates to cryogenic engineering and can be used to obtain liquefied natural gas (LNG) at gas distribution stations (GDS) through the use of pressure drop between the main and distribution pipelines.

A known method for the production of liquefied natural gas and complex for its implementation [RU 2541360, publ. 10.02.2015, IPC F25J 1/00], which includes a natural gas inlet line connected to the GDS mainline with a dust filter, an inlet gas meter, a drying unit, an adsorbent particle cleaning filter, a heat recovery line with a heat exchanger and a regulator pressure, jet compressor, gas meter at the outlet, carbon dioxide gas purification unit with filter, as well as a preliminary heat exchanger, expander-compressor unit with auxiliary systems, main heat exchanger, throttle, separator with valve and storage for LNG cryopump.

The disadvantage of the known complex is the low LNG yield due to the irrational expenditure of energy for reducing the process gas stream for its preliminary compression, as well as the low quality of LNG due to the lack of equipment for cleaning gas from heavy hydrocarbons.

Closest to the proposed invention, the method of liquefying natural gas (options) and installation for its implementation (options) [RU 2438081, publ. 12.27.2011, IPC F25J 1/00], in one of the options including a high-pressure gas line, divided into a production gas line and a process gas line, which is equipped with a drying unit, a preliminary heat exchanger and an expander, and is connected in front of the main heat exchanger with a line return gas, forming a low pressure gas line with preliminary and main heat exchangers. The production gas line is equipped with a compressor, kinematically connected with an expander, drying and cleaning units, as well as with preliminary and main heat exchangers, a throttle valve (reducing device) and a separator with return gas and LNG discharge lines.

The disadvantage of this installation is a low LNG yield due to the lack of a device for cooling compressed production gas and inefficient use of the cold potential of the return gas due to the connection of the return gas line with the process gas line in front of the main heat exchanger.

The task of the invention is to increase the output of LNG.

Two installation options are offered.

The technical result is an increase in the output of LNG, which in the first embodiment of the installation is achieved by placing on the production gas line a heat exchanger "compressed production gas / low pressure gas", and also by installing an expander kinematically or electrically connected to the compressor instead of a throttle valve and eliminating the connection of the process gas line to the pre-heated reverse gas line. In the second variant of the installation, the technical result is achieved due to similar technical measures, except for the fact that a cooler is installed on the production gas line instead of the heat exchanger "compressed production gas / low pressure gas".

This technical result in the first embodiment is achieved by the fact that in a known installation, including a drying unit, a high pressure gas line divided into a production gas line and a process gas line, which is equipped with a preliminary heat exchanger and an expander and connects to the return gas line pressure with a preliminary heat exchanger, and the production flow line is equipped with a compressor connected to the expander, cleaning unit, main heat exchanger, reducing device and a separator with lines of reverse gas and LNG discharge, the peculiarity is that the drying unit is located on the high pressure gas line, the heat exchanger “compressed production gas / low pressure gas” is installed on the compressed production gas line, and after the purification unit the heat exchanger is “cleaned compressed production gas / reduced process gas ", after which the process gas line is connected to the return gas line after the main heat exchanger; moreover, it is set as a reducing device an expander connected to the compressor.

The second variant of the installation is characterized in that a cooler is installed in the line of compressed production gas instead of the heat exchanger "compressed production gas / low pressure gas".

In both embodiments, the process gas line after the pre-heat exchanger can be connected to the production gas line to the compressor. If necessary, preheating of low pressure gas in the second version of the installation on the line of compressed production gas can be located heat exchanger "compressed production gas / part of low pressure gas."

The compressor can be connected with expanders both kinematically and electrically, by means of an electric motor powered from electric generators connected to the expanders. The refrigerator can be made, for example, in the form of a water or air cooling apparatus. The purification unit may include units for adsorption or absorption purification from carbon dioxide and heavy hydrocarbons. The execution of the process gas pipeline between the expander and the heat exchanger "purified compressed production gas / reduced process gas" should exclude the possibility of formation of solid carbon dioxide deposits on the walls, for example, due to high velocity or turbulization of the gas flow. Execution of the heat exchanger "purified compressed production gas / reduced process gas" should exclude the possibility of accumulation of solid carbon dioxide deposits on internal surfaces, for example, due to a two-section design with periodic shutdown of sections as sediment accumulates and they are heated to evaporate solid carbon dioxide. As the remaining elements of the installation can be placed any device of the appropriate purpose, known from the prior art.

Installing a “compressed production gas / low pressure gas” (first option) or cooler (second option) on the production gas line of the heat exchanger to cool the compressed production gas stream allows heat to be removed from the system, which reduces the temperature of the production gas, increases the liquefaction coefficient and LNG yield. Connecting the process gas line to the return gas line after it is heated by cooling the production gas stream with it allows the latter to be cooled in the main heat exchanger to a lower temperature, which further increases the yield of LNG.

Both installation options include drying units 1 and cleaning 2, heat exchangers: pre-3, primary 4, "purified compressed production gas / reduced process gas" 5, expanders 6 and 7, compressor 8 and separator 9. The first installation option includes an additional heat exchanger "compressed production gas / low pressure gas "10, and the second option is a refrigerator 11, and also, possibly, heat exchanger 12" compressed production gas / part of low pressure gas "(shown in dotted lines).

When the first installation option (Fig. 1) is in operation, high-pressure natural gas flowing through line 13 is dried in block 1 and divided into production gas stream 14 and process gas stream 15, which is cooled in heat exchanger 3, reduced in expander 6, heated to heat exchanger 5 and mixed with the reverse flow of gas supplied through line 16 from separator 9 after heating in heat exchanger 4. The resulting low-pressure gas through line 17 is removed to the consumer after heating in heat exchangers 3 and 10. Production gas supplied through line 14 is compressed to Compressor 8, cooled in heat exchanger 10, cleaned from carbon dioxide and other heavy impurities in block 2, cooled in heat exchangers 5 and 4, reduced in expander 7 and separated in separator 9 to reverse gas flow and LNG discharged through line 18. Work second The installation option (Fig. 2) differs in that the compressed product gas before block 2 is cooled in the refrigerator 11. The dotted line shows that in both versions of the installation the process gas line after the preliminary heat exchanger can be connected to the production gas line to the compressor line 19, and if necessary, preheating of low pressure gas in the second version of the installation, on the bypass line of low pressure gas can be additionally installed heat exchanger "compressed production gas / part of low pressure gas" 12.

Thus, the proposed installation allows to increase the output of LNG and can be used in the gas industry.

Claims (2)

1. Installation for producing liquefied natural gas, including a drying unit, a high-pressure gas line divided into a production gas line and a process gas line, which is equipped with a preliminary heat exchanger and an expander and connects to the return gas line, forming a low-pressure gas line with a preliminary heat exchanger, and the production flow line is equipped with a compressor associated with an expander, a cleaning unit, a main heat exchanger, a reducing device and a separator with return gas lines and an LNG discharge, characterized in that the drying unit is located on the high-pressure gas line, a “compressed production gas / low-pressure gas” heat exchanger is installed on the compressed production gas line, and a “purified compressed production gas / reduced process gas” heat exchanger is placed after the cleaning unit , after which the process gas line is connected to the return gas line after the main heat exchanger, while the expander connected to the compressor is installed as a reducing device.
2. Installation for producing liquefied natural gas, including a drying unit, a high-pressure gas line divided into a production gas line and a process gas line, which is equipped with a preliminary heat exchanger and an expander and connects to the return gas line, forming a low-pressure gas line with a preliminary heat exchanger, and the production flow line is equipped with a compressor associated with an expander, a cleaning unit, a main heat exchanger, a reducing device and a separator with return gas lines and an LNG discharge, characterized in that the drying unit is located on the high-pressure gas line, a cooler is installed on the compressed production gas line, and after the purification unit a heat exchanger is placed “purified compressed production gas / reduced process gas”, after which the process gas line is connected to the line return gas after the main heat exchanger, while the expander connected to the compressor is installed as a reducing device.
RU2018137518A 2018-10-23 2018-10-23 Plant for production of liquefied natural gas (versions) RU2686655C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3503220A (en) * 1967-07-27 1970-03-31 Chicago Bridge & Iron Co Expander cycle for natural gas liquefication with split feed stream
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
RU2636966C1 (en) * 2016-11-14 2017-11-29 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" Method for production of liquefied natural gas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3503220A (en) * 1967-07-27 1970-03-31 Chicago Bridge & Iron Co Expander cycle for natural gas liquefication with split feed stream
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
RU2636966C1 (en) * 2016-11-14 2017-11-29 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" Method for production of liquefied natural gas

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