RU2662749C2 - Natural gas liquefaction station - Google Patents

Natural gas liquefaction station Download PDF

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Publication number
RU2662749C2
RU2662749C2 RU2015151353A RU2015151353A RU2662749C2 RU 2662749 C2 RU2662749 C2 RU 2662749C2 RU 2015151353 A RU2015151353 A RU 2015151353A RU 2015151353 A RU2015151353 A RU 2015151353A RU 2662749 C2 RU2662749 C2 RU 2662749C2
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RU
Russia
Prior art keywords
gas
line
natural gas
separation
cooling unit
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RU2015151353A
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Russian (ru)
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RU2015151353A (en
Inventor
Андрей Владиславович Курочкин
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Ассоциация инженеров-технологов нефти и газа "Интегрированные технологии"
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Priority to RU2015151353A priority Critical patent/RU2662749C2/en
Publication of RU2015151353A publication Critical patent/RU2015151353A/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 engineering and can be used in gas industry for liquefaction of natural gas. Proposed is a station that includes a purification unit located on the natural gas line, a compressor driven by an internal combustion engine, connected to the chiller, the pre-cooling unit with external and own refrigerants, separation gas and part of process gas, a re-cooling unit with separation gas and reduced process gas, after which the natural gas line is branched into a process gas line with a reducing device and a product gas line with a device for reducing and separating. Wherein the purification unit is connected to the pre-cooling unit by a feed line of heated separation gas, and the drive is connected to the cleaning unit by the fuel gas supply line and to the chiller with a heat transfer line. Chiller is connected to the pre-cooling unit by the refrigerant supply line.
EFFECT: high output of liquefied natural gas.
1 cl, 1 dwg

Description

The invention relates to cryogenic technology and can be used in the gas industry for liquefying natural gas.

A known method of partial liquefaction of natural gas [RU 2525759, publ. 08/20/2014, IPC F25J 1/00], which is implemented on a plant that includes a preliminary heat exchanger, a regulating throttle, a preheater, a heat exchanger, regulating production and process flow chokes, a distillation column with bottoms liquid outlet, a heat exchanger-condenser, a regulating choke, a collector - liquefied natural gas separator and bypass choke.

A disadvantage of the known device is the low yield of liquefied natural gas due to the lack of devices for circulating the process stream.

Closest to the proposed invention is a method of partial liquefaction of natural gas and installation for its implementation [RU 2280826, publ. 07.27.2006, IPC F25J 1/00], which includes a sequentially located on the natural gas line adjacency of the return flow line (process gas), a compressor driven by an internal combustion engine, a heat exchanger (block) for pre-cooling with a process stream, a drying unit, and carbon dioxide gas purification (gas purification unit), re-cooling unit with process gas and waste stream (separation gas), a throttle valve and a separator (device for reduction and separation) with a condenser-evaporator, Which line is branched into a process gas line and a product gas line with a throttle valve connected to the separator with the output lines of liquefied natural gas and separation gas.

The disadvantage of this installation is the low yield of liquefied natural gas due to insufficient cooling capacity of the recovery equipment.

The objective of the invention is to increase the yield of liquefied natural gas.

The technical result obtained by using the invention is to increase the output of liquefied natural gas by including equipment for additional gas cooling with a third-party refrigerant (for example, air) and its own refrigerant, obtained using a chiller due to the heat of the exhaust gases from the compressor drive.

The specified technical result is achieved by the fact that in a known installation comprising sequentially located on a natural gas line: adjoining a process gas line, a compressor driven by an internal combustion engine, a pre-cooling unit, a re-cooling unit with a process gas and a separation gas, and branching on the process and product gas, as well as a gas purification unit, a device for reduction and separation, and a reducing device, the feature is that gas purification is located before the adjoining process gas line, the pre-cooling unit is equipped with partially heated and exhaust gas separation inlet lines, external refrigerant input / output lines and is connected to the chiller with its own refrigerant input / output lines, and the branching of the natural gas line is located after the re-cooling unit while the device for reduction and separation is installed on the product gas line, and the reducing device is located on the process gas line, in addition, the chiller is connected to the drive by coolant input / output lines.

When liquefying natural gas enriched with nitrogen and other light components, it is advisable to use a stripping column equipped with a reducing device and process gas input / output lines as a device for reduction and separation.

The proposed station includes a natural gas line 1, on which the purification unit 2 is located, an adjoining line of the heated reduced process gas 3, a compressor 4 driven by an internal combustion engine 5, which is connected to the chiller 6 (for example, an absorption refrigeration machine) with coolant supply lines 7 ( for example, exhaust gas) and with a purification unit 2, a fuel gas supply line 8, a natural gas pre-cooling unit 9, equipped with input / output lines of an external refrigerant 10, for example, air, input / output own refrigerant 11, partially heated 12 inlet and outlet separation gas 13 lines, partially heated 14 inlet and heated reduced process gas 3 output lines, and also a natural gas re-cooling unit 15 with reduced process gas supplied through line 16 and separation gas supplied through line 17, after which the natural gas line is branched into a process gas line 18 with a reducing device 19 installed on it, equipped with a process gas supply line 16, and a line July 20 of the product gas with a reduction and separation device 21 mounted thereon, equipped with liquefied natural gas output lines 22 and a separation gas supply line 17. The purification unit 2 is connected to the unit 9 by a heated separation gas supply line 13. The chiller 6 can be connected to the unit 2 by a supply line 9 of a part of the fuel gas 23. At a low pressure of natural gas, an inlet compressor 24 (shown by a dotted line) can be additionally installed on line 1.

When the station is operating, natural gas is fed through line 1 to block 2, where it is cleaned of water vapor, carbon dioxide, heavy hydrocarbons, sulfur compounds and mercury vapor, for example, by adsorption, mixed with heated reduced process gas supplied via line 3, and compressed by compressor 4 , pre-cooled in block 9 by an external refrigerant and process streams, then re-cooled in block 15 by the reduced process gas supplied through line 16 and the separation gas supplied through line 17 and separated into process az fed via line 18 into a reducing device 19, and product gas supplied through line 20 to a device for reduction and separation 21 from which is output on line 22 and liquefied natural gas through line 17 - gas separation. Heated separation gas through line 13 from block 9 is supplied to block 2 for use as a purge gas, for example, and from block 2, fuel gas containing at least a portion of impurities removed from natural gas is supplied to drive 5 through line 8 and, possibly to chiller 6 via line 23. From the drive 5 to the chiller 6 via line 7 a coolant, for example, exhaust gas, is supplied. If necessary, natural gas is pre-compressed with a compressor 24 (indicated by a dotted line).

The proposed station allows you to get liquefied natural gas with a yield of at least 90%, which significantly exceeds the similar indicator of the prototype - 60%.

Thus, the proposed station allows to increase the output of liquefied natural gas and can find application in the gas industry.

Claims (2)

1. A natural gas liquefaction station, including successively located on a natural gas line: an adjoining process gas line, a compressor driven by an internal combustion engine, a pre-cooling unit, a re-cooling unit with process gas and separation gas, and branching on the process and product gas lines, and also a gas purification unit, a device for reducing and separating and a reducing device, characterized in that the gas purification unit is located before adjoining the technical line gas, the pre-cooling unit is equipped with partially heated and exhaust gas separation inlet lines, external refrigerant I / O lines and is connected to the chiller with its own refrigerant I / O lines, and the branching of the natural gas line is located after the re-cooling unit, while the reduction device and separation is installed on the product gas line, and a reducing device is located on the process gas line, in addition, the chiller is connected to the drive by I / O lines coolant outlet.
2. The station according to claim 1, characterized in that a stripper column equipped with a reducing device and process gas input / output lines is used as a device for reduction and separation.
RU2015151353A 2015-11-30 2015-11-30 Natural gas liquefaction station RU2662749C2 (en)

Priority Applications (1)

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RU2015151353A RU2662749C2 (en) 2015-11-30 2015-11-30 Natural gas liquefaction station

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RU2015151353A RU2662749C2 (en) 2015-11-30 2015-11-30 Natural gas liquefaction station

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RU2015151353A RU2015151353A (en) 2017-06-02
RU2662749C2 true RU2662749C2 (en) 2018-07-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2180081C1 (en) * 2001-06-07 2002-02-27 Государственное унитарное дочернее предприятие "Московский газоперерабатывающий завод" Method of liquefaction of methane, mainly for gas-filling stations of transport facilities
RU2212598C1 (en) * 2002-02-26 2003-09-20 Горбачев Станислав Прокофьевич Method and apparatus for natural gas partial liquefaction
WO2006051622A1 (en) * 2004-11-15 2006-05-18 Mayekawa Mfg. Co., Ltd Cryogenic liquefying refrigerating method and device
RU2280826C2 (en) * 2004-03-31 2006-07-27 Открытое акционерное общество "Научно-производственное объединение "ГЕЛИЙМАШ" (ОАО "НПО "ГЕЛИЙМАШ") Method and plant for partial natural gas liquefaction
GB2470062A (en) * 2009-05-08 2010-11-10 Corac Group Plc Production and Distribution of Natural Gas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2180081C1 (en) * 2001-06-07 2002-02-27 Государственное унитарное дочернее предприятие "Московский газоперерабатывающий завод" Method of liquefaction of methane, mainly for gas-filling stations of transport facilities
RU2212598C1 (en) * 2002-02-26 2003-09-20 Горбачев Станислав Прокофьевич Method and apparatus for natural gas partial liquefaction
RU2280826C2 (en) * 2004-03-31 2006-07-27 Открытое акционерное общество "Научно-производственное объединение "ГЕЛИЙМАШ" (ОАО "НПО "ГЕЛИЙМАШ") Method and plant for partial natural gas liquefaction
WO2006051622A1 (en) * 2004-11-15 2006-05-18 Mayekawa Mfg. Co., Ltd Cryogenic liquefying refrigerating method and device
GB2470062A (en) * 2009-05-08 2010-11-10 Corac Group Plc Production and Distribution of Natural Gas

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Effective date: 20180319