RU2691876C1 - Plant for liquefied natural gas production (versions) - Google Patents

Plant for liquefied natural gas production (versions) Download PDF

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Publication number
RU2691876C1
RU2691876C1 RU2018137520A RU2018137520A RU2691876C1 RU 2691876 C1 RU2691876 C1 RU 2691876C1 RU 2018137520 A RU2018137520 A RU 2018137520A RU 2018137520 A RU2018137520 A RU 2018137520A RU 2691876 C1 RU2691876 C1 RU 2691876C1
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RU
Russia
Prior art keywords
gas
gas line
heat exchanger
production
line
Prior art date
Application number
RU2018137520A
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Russian (ru)
Inventor
Андрей Владиславович Курочкин
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Андрей Владиславович Курочкин
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Priority to RU2018137520A priority Critical patent/RU2691876C1/en
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Publication of RU2691876C1 publication Critical patent/RU2691876C1/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
    • 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
    • F25J1/003Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work

Abstract

FIELD: cryogenics.
SUBSTANCE: invention relates to cryogenic equipment and can be used for production of liquefied natural gas at gas distribution stations. Plant includes a drying unit, a high pressure gas line, which is divided into a production gas line and a process gas line connected to the return gas line, forming a low pressure gas line with a preliminary heat exchanger, and production flow line is equipped with compressor connected to expander, cleaning unit, main heat exchanger, reducing device and separator with lines of return gas and LNG drain. Dehydration unit is located on high pressure gas line. Heat exchanger "compressed production gas / low pressure gas" and two-section heat exchanger "compressed production gas / reduced process gas" are successively installed on compressed production gas line with cleaning unit arranged between sections, after which the process gas line is connected to the return gas line downstream the main heat exchanger. Reducer is arranged as reducing device and connected with compressor. In compliance with second version, refrigerator is additionally fitted on 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 potential of the return gas cold due to the connection of the return gas line to the process gas line in front of the main heat exchanger, as well as the large metal intensity of the equipment due to the location of the cleaning unit on the line of compressed production gas having a high temperature, which reduces the capacity of adsorbents and increases the volume of their loading.

The task of the invention is to increase the yield of LNG and reduction of metal equipment.

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". The reduction of metal consumption is achieved by placing the cleaning unit between the two sections of the heat exchanger "compressed production gas / reduced process 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 drain, the feature is that the drying unit is located on the high pressure gas line, the heat exchanger "compressed production gas / low pressure gas" and the two-section heat exchanger "compressed production gas / reduced process gas "with a purification unit located between the sections, after which the process gas line is connected to the return gas line after the main heat exchanger, while as The reducing device is 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 adsorption purification units 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 the output of LNG. 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. Placing the cleaning unit between the heat exchanger sections "compressed production gas / reduced process gas" allows you to clean the gas at a lower temperature, which increases the capacity of adsorbents, reduces their loading and reduces the metal intensity of the equipment.

Both installation options include drying units 1 and cleaning 2, heat exchangers: preliminary 3, main 4 and two-section "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 The compressor 8 is cooled in the heat exchanger 10 of the first section of the heat exchanger 5, cleaned of carbon dioxide and heavy impurities in block 2, cooled in the second section of the heat exchanger 5 and in the heat exchanger 4, reduced in the expander 7 and separated in the separator 9 into reverse gas flow and LNG, outputted on line 18. The operation of the second installation variant (Fig. 2) is characterized in that the compressed product gas is cooled in the refrigerator 11. The dotted line shows that in both installation versions the process gas line after the preliminary heat exchanger can be Connected to the production gas line to the compressor by line 19, and if necessary to preheat the low-pressure gas in the second installation option, a “compressed production gas / low-pressure gas exchanger” 12 exchanger can be additionally installed on the low-pressure gas by-line.

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

Claims (2)

1. Installation for the production of liquefied natural gas, including a drying unit, high pressure gas line, divided into production gas line and process gas line, which is equipped with a preliminary heat exchanger and 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, on the compressed production gas line the heat exchanger "compressed production gas / low pressure gas" and the two-section heat exchanger "compressed production gas / reduced process gas" are installed in series with a cleaning unit, placed between the sections, after which the process gas line is connected to the return gas line after the main heat exchanger, while the expander is installed as a reducing device ny with the compressor.
2. Installation for the production of liquefied natural gas, including a drying unit, high pressure gas line, divided into production gas line and process gas line, which is equipped with a preliminary heat exchanger and 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 drain, characterized in that the drying unit is located on the high-pressure gas line, a cooler and a two-section heat exchanger "compressed production gas / reduced process gas" are installed in series with a cleaning unit placed between the sections, after which the process gas line connected to the return gas line after the main heat exchanger, while the expander connected to the compressor is installed as a reducing device.
RU2018137520A 2018-10-23 2018-10-23 Plant for liquefied natural gas production (versions) RU2691876C1 (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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