CN105783419B - A kind of natural gas pre-cooler and pre- cooling control method - Google Patents
A kind of natural gas pre-cooler and pre- cooling control method Download PDFInfo
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- CN105783419B CN105783419B CN201610192321.5A CN201610192321A CN105783419B CN 105783419 B CN105783419 B CN 105783419B CN 201610192321 A CN201610192321 A CN 201610192321A CN 105783419 B CN105783419 B CN 105783419B
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- Prior art keywords
- cooling medium
- natural gas
- pump
- barrel pump
- low temperature
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 235
- 239000003345 natural gas Substances 0.000 title claims abstract description 116
- 238000001816 cooling Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002826 coolant Substances 0.000 claims abstract description 157
- 239000007788 liquid Substances 0.000 claims abstract description 130
- 238000011282 treatment Methods 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 45
- 239000010687 lubricating oil Substances 0.000 claims description 43
- 239000012530 fluid Substances 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 17
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 claims 2
- 125000001153 fluoro group Chemical group F* 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes 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
- F25J1/0047—Processes 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 an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes 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 an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0298—Safety aspects and control of the refrigerant compression system, e.g. anti-surge control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
Abstract
This application provides a kind of pre-cooler of natural gas and pre- cooling control methods, pre-cooler includes canned motor pump, barrel pump, heat exchanger and cooling medium processing unit, method includes: that the pressure controlled in barrel pump maintains in pre-set pressure range, it controls canned motor pump and the low temperature liquid cooling medium in barrel pump is delivered to cold box system front end, it controls heat exchanger and carries out precooling treatment using natural gas of the low temperature liquid cooling medium to cold box system front end, to export the natural gas and gaseous cooling medium of preset temperature, and the natural gas transportation of preset temperature to cold box system is subjected to high-pressure jet, gaseous cooling medium is delivered to barrel pump, it controls cooling medium processing unit and the gaseous cooling medium in barrel pump is converted into low temperature liquid cooling medium to recycle.The application provides pre-cooler and pre- cooling control method and natural gas can be pre-chilled, and the liquefied fraction of natural gas can be improved when being liquefied for the natural gas after pre-cooling, reduces circulating air, reduces the liquefaction cost of natural gas.
Description
Technical field
The present invention relates to field of energy and chemical technology more particularly to the pre-coolers and pre-cooling controlling party of a kind of natural gas
Method.
Background technique
In the prior art, 40 DEG C, the natural gas straight of 20Mpa enter ice chest carry out high-pressure jet, 1/4 natural gas liquefaction,
3/4 circulating air returns to compressor and carries out pressurization cycle again, that is, and the liquefied fraction of natural gas is lower, and circulating flow rate is larger, also,
Supercharging amount is too many again for circulating air, leads to the liquefaction higher cost of natural gas.
Summary of the invention
In view of this, the present invention provides a kind of pre-cooler of natural gas and pre- cooling control method, it is existing to solve
The liquefied fraction of natural gas is lower in technology, and circulating flow rate is larger, also, supercharging amount is too many again for circulating air, leads to natural gas
Liquefy the higher problem of cost, and its technical solution is as follows:
A kind of pre-cooler of natural gas, the pre-cooler of the natural gas include: barrel pump, canned motor pump, heat exchanger and cold
But media processing device；
The barrel pump, for storing low temperature liquid cooling medium；
The canned motor pump, for sending the low temperature liquid cooling medium in the barrel pump to cold box system front end；
The heat exchanger, for the natural gas of the cold box system front end to be pre-chilled using the low temperature liquid cooling medium
High-pressure jet is carried out to preset temperature, and by the natural gas transportation after pre-cooling to the cold box system, gaseous cooling medium is defeated
It send to the barrel pump, is converted to the gaseous cooling medium after the pre-cooled processing of low temperature liquid cooling medium；
The cooling medium processing unit, for the gaseous cooling medium in the barrel pump to be converted to low temperature liquid
Cooling medium is to recycle.
Wherein, the cooling medium processing unit includes: screw compressor, refrigerated separation equipment, oil storage tank, liquid storage
Tank, economizer and oil pump；
The oil storage tank, for storing lubricating oil；
The screw compressor, for absorbing in the gaseous cooling medium in the barrel pump and the oil storage tank
Lubricating oil is pressurized to default pressure together；
The refrigerated separation equipment, for the gaseous cooling medium of the lubricating oil and default pressure to be carried out cooling place
Reason isolates the lubricating oil and described default from the liquid cooling medium of lubricating oil and default pressure that cooling treatment obtains
The liquid cooling medium of pressure, and the lubricating oil is delivered to the oil storage tank, the liquid cooled of the default pressure is situated between
Matter is delivered to the fluid reservoir；
The economizer carries out at cooling for the liquid cooling medium to the default pressure in the fluid reservoir
Reason, and cooling is handled to obtain low temperature liquid cooling medium and is delivered to the barrel pump storage through main supplying valve to recycle；
The oil pump is recycled for being pressurized to the lubricating oil in the oil storage tank.
Wherein, the screw compressor is also used to absorb the gaseous cooling medium in the barrel pump, passes through adjusting
Carrying position maintains the pressure of the barrel pump in pre-set pressure range, so that the heat exchanger is situated between using the low temperature liquid is cooling
When the natural gas of verifying is cooled down, the natural gas is cooled to preset temperature.
Wherein, the pre-cooler further include: liquid level detector；
The liquid level detector, for detecting the liquid level in the barrel pump, so that cooling medium provides device in the bucket
The low temperature liquid cooling medium is added to the barrel pump when liquid level in pump is less than preset value.
Wherein, the cooling medium is freon.
A kind of pre- cooling control method of natural gas is applied to a pre-cooler, and the pre-cooler includes: canned motor pump, bucket
Pump, heat exchanger and cooling medium processing unit, which comprises
It controls the canned motor pump and the low temperature liquid cooling medium in the barrel pump is delivered to cold box system front end；
The heat exchanger is controlled to carry out using natural gas of the low temperature liquid cooling medium to the cold box system front end
Precooling treatment, to export the natural gas and gaseous cooling medium of preset temperature, and extremely by the natural gas transportation of the preset temperature
The cold box system carries out high-pressure jet, and the gaseous cooling medium is delivered to the barrel pump；
It controls the cooling medium processing unit and the gaseous cooling medium in the barrel pump is converted into the low temperature
Liquid cooling medium is to recycle.
Wherein, the cooling medium processing unit includes: screw compressor, refrigerated separation equipment, oil storage tank, liquid storage
Tank, economizer and oil pump；
Then control the cooling medium processing unit gaseous cooling medium in the barrel pump is converted to it is described low
Warm liquid cooling medium is to recycle, comprising:
It controls in the gaseous cooling medium and the oil storage tank that the screw compressor absorbs in the barrel pump
Lubricating oil is pressurized to default pressure together；
It controls the refrigerated separation equipment and the gaseous cooling medium of the lubricating oil and default pressure is subjected to cooling treatment,
The lubricating oil and the default pressure are isolated from the liquid cooling medium of lubricating oil and default pressure that cooling treatment obtains
Strong liquid cooling medium, and the lubricating oil is delivered to the oil storage tank, by the liquid cooling medium of the default pressure
It is delivered to the fluid reservoir；
It controls the economizer liquid cooling medium in the fluid reservoir cools down to export the low temperature
Liquid cooling medium, and control main supplying valve and open so that the low temperature liquid cooling medium be input to the barrel pump storage with
It recycles；
It controls the oil pump and pressurized treatments is carried out to the lubricating oil in the oil storage tank to recycle.
The method also includes:
It controls the screw compressor and absorbs the gaseous cooling medium in the barrel pump, carry position by adjusting and make institute
The pressure for stating barrel pump maintains in pre-set pressure range, utilizes the low temperature liquid cooling medium pair to control the heat exchanger
When the natural gas is cooled down, the natural gas is cooled to preset temperature.
Before controlling the shielding pump startup, the method also includes:
Detect the liquid level in the barrel pump；
Judge the liquid level in the barrel pump whether less than the first preset value；
When the liquid level in the barrel pump is less than first preset value, controls main supplying valve and open so as to cooling medium offer
The low temperature liquid cooling medium is added to the barrel pump in device；
When the liquid level in the barrel pump is greater than the second preset value, the shielding pump startup is controlled.
The cooling medium is freon.
Above-mentioned technical proposal has the following beneficial effects:
The pre-cooler of natural gas provided by the invention and pre- cooling control method carry out natural gas using cooling medium
The liquefied fraction of natural gas can be improved when being liquefied for pre-cooling, the natural gas after pre-cooling, reduces circulating air, reduces natural gas
Liquefy cost, also, cooling medium can also be recycled benefit by the pre-cooler of natural gas provided by the invention and pre- cooling control method
With having saved cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a structural schematic diagram of the pre-cooler of natural gas provided in an embodiment of the present invention；
Fig. 2 is another structural schematic diagram of the pre-cooler of natural gas provided in an embodiment of the present invention；
Fig. 3 is a flow diagram of the pre- cooling control method of natural gas provided in an embodiment of the present invention；
Fig. 4 is another flow diagram of the pre- cooling control method of natural gas provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of pre-coolers of natural gas, referring to Fig. 1, showing the one of the pre-cooler
Structural schematic diagram may include: barrel pump 101, canned motor pump 102, heat exchanger 103 and cooling medium processing unit 104.Wherein:
Barrel pump 101, for storing low temperature liquid cooling medium.
Canned motor pump 102, for sending the low temperature liquid cooling medium in barrel pump to cold box system front end.
Heat exchanger 103, for the natural gas of cold box system front end to be cooled to default temperature in advance using low temperature liquid cooling medium
Degree, and the natural gas transportation after pre-cooling to cold box system is subjected to high-pressure jet, gaseous cooling medium is delivered to barrel pump,
In, gaseous cooling medium is converted to after the pre-cooled processing of low temperature liquid cooling medium.
Illustratively, 40 DEG C, the natural gas of 20Mpa, after heat exchanger 103 carries out being pre-chilled to -40 DEG C, into ice chest into
Horizontal high voltage jet stream, 1/3 flow generate liquified natural gas, and 2/3 circulating air turns again to compressor and is recycled.That is,
Compared with prior art, the liquefied fraction of natural gas improves, and circulating air is reduced, and reduces the liquefaction cost of natural gas.
Cooling medium processing unit 104, for the gaseous cooling medium in barrel pump to be converted to low temperature liquid cooling medium
To recycle.
Natural gas can be pre-chilled in pre-cooler provided in an embodiment of the present invention, and the natural gas after pre-cooling is liquefying
When the liquefied fraction of natural gas can be improved, reduce circulating air, reduce the liquefaction cost of natural gas.
Referring to Fig. 2, showing another structural schematic diagram of pre-cooler provided in an embodiment of the present invention, may include:
Barrel pump 201, canned motor pump 202, heat exchanger 203, screw compressor 204, refrigerated separation equipment 205, oil storage tank 206, fluid reservoir
207, economizer 208 and oil pump 209.Wherein:
Barrel pump 201, for storing low temperature liquid cooling medium.
Oil storage tank 206, for storing lubricating oil.
Screw compressor 204 makes bucket by adjusting load position for absorbing the low temperature liquid cooling medium in barrel pump 201
The pressure of pump 201 maintains in pre-set pressure range.The pressure of barrel pump 201 is maintained the purpose in pre-set pressure range to exist
In when natural gas is pre-chilled using the low temperature liquid cooling medium in barrel pump 201, the natural gas after can making pre-cooling reaches
To preset temperature value.
Canned motor pump 202, for sending the low temperature liquid cooling medium in barrel pump 201 to cold box system front end.
Heat exchanger 203, for the natural gas of cold box system front end to be cooled to default temperature in advance using low temperature liquid cooling medium
Degree, and the natural gas transportation after pre-cooling to cold box system is subjected to high-pressure jet, gaseous cooling medium is delivered to barrel pump,
In, gaseous cooling medium is converted to after the pre-cooled processing of low temperature liquid cooling medium.
Screw compressor 204, the gaseous cooling medium for absorbing in barrel pump increase together with the lubricating oil in oil storage tank
It is depressed into default pressure.
Refrigerated separation equipment 205, for the gaseous cooling medium of lubricating oil and default pressure to be carried out cooling treatment, from cold
But the liquid cooled of lubricating oil and default pressure is isolated in the liquid cooling medium of the lubricating oil and default pressure that handle
Medium, and the lubricating oil isolated is delivered to oil storage tank, the liquid cooling medium for the default pressure isolated is delivered to storage
Flow container.
Economizer 208 obtains Low Temperature Liquid for carrying out cooling processing to the liquid cooling medium for presetting pressure in fluid reservoir
State cooling medium, and the low temperature liquid cooling medium is delivered to the storage of barrel pump 201 to recycle.
Oil pump 209 is recycled for being pressurized to the lubricating oil in oil storage tank 206.
Wherein, screw compressor 204 are also used to maintain the pressure in barrel pump in pre-set pressure range, specifically,
Screw compressor absorbs the gaseous cooling medium in barrel pump, so that the pressure of barrel pump is maintained preset pressure model by adjusting load position
In enclosing, when cooling down using low temperature liquid cooling medium to natural gas so as to heat exchanger, natural gas is cooled to preset temperature.
Such as the pressure in barrel pump is maintained 0.020~0.022, the low temperature liquid freon in use barrel pump 201 is to natural gas
When being pre-chilled, the natural gas after can making pre-cooling reaches preset temperature value, such as 0 DEG C, and the natural gas of 20Mpa is cooled to -40 in advance
℃。
Pre-cooler provided in an embodiment of the present invention can also include liquid level detector.Liquid level detector is for detecting barrel pump
In liquid level, so as to cooling medium provide when device (such as economizer) liquid level in barrel pump is less than preset value be added to barrel pump it is low
Warm liquid cooling medium.
Cooling medium is freon in the present embodiment.Below by taking cooling medium is freon as an example, provide to 40 DEG C,
The detailed process that the natural gas of 20Mpa is pre-chilled:
Low temperature liquid freon is stored in barrel pump.By the low temperature liquid freon being stored in barrel pump, (liquid level is situated between canned motor pump
Between 100mm~570mm) it send to cold box system front end, by heat exchanger to 40 DEG C, the natural gas of 20Mpa is pre-chilled, will
Natural gas is cooled to -40 DEG C in advance, and -40 DEG C of natural gas carries out high-frequency jet, and becomes room temperature after the heat exchange of the freon of low temperature liquid
Gaseous state freon, room temperature gaseous state freon return to barrel pump.
Then, it is pressurized to together after the gaseous state freon in barrel pump is absorbed by screw compressor unit with lubricating oil
1.0Mpa, then by refrigerated separation equipment 205 carry out it is cooling, separate freon and lubricating oil separation comes, lubricating oil into
Enter recycling after oil storage tank is pressurized by oil pump, the liquid freon of the 1.0Mpa isolated is stored in fluid reservoir, is stored up
1.0Mpa liquid freon in flow container exports low temperature liquid freon, low temperature liquid freon after handling by economizer cooling
It send after the throttling of main liquid supply electromagnetic valve to barrel pump and stores.
Gaseous state freon in barrel pump is absorbed by screw compressor, and passes through the load position of adjusting screw rod formula compressor,
The pressure of barrel pump is controlled can guarantee the fluorine benefit for being stored in the low temperature liquid of barrel pump such as 0.020~0.022 in a pressure limit
It is high finally with 40 DEG C, when the natural gas of 20Mpa is pre-chilled, by 40 DEG C, the natural gas of 20Mpa is cooled to -40 DEG C of natural gas in advance,
40 DEG C, the natural gas of 20Mpa carries out high-pressure jet after pre-cooler is pre-chilled to -40 DEG C, into cold box system
When, 1/3 flow generates liquified natural gas, and 2/3 circulating air turns again to compressor and is recycled.That is, with existing skill
Art is compared, and the liquefied fraction of natural gas improves, and circulating air is reduced, and reduces the liquefaction cost of natural gas.
Natural gas can be pre-chilled in pre-cooler provided in an embodiment of the present invention, and the natural gas after pre-cooling is liquefying
When the liquefied fraction of natural gas can be improved, reduce circulating air, reduce the liquefaction cost of natural gas.
The embodiment of the invention also provides a kind of pre- cooling control methods of natural gas, are applied to a pre-cooler, pre- cold charge
Setting includes: canned motor pump, barrel pump, heat exchanger and cooling medium processing unit, please refers to Fig. 3 and shows the stream of the pre- cooling control method
Journey schematic diagram, the pre- cooling control method may include:
Step S301: the low temperature liquid cooling medium in barrel pump is delivered to cold box system front end by control canned motor pump.
Step S302: control heat exchanger is pre-chilled using natural gas of the low temperature liquid cooling medium to cold box system front end
Processing, to export the natural gas and gaseous cooling medium of preset temperature, and by the natural gas transportation of preset temperature to cold box system
High-pressure jet is carried out, gaseous cooling medium is delivered to barrel pump.
Step S303: the gaseous cooling medium in barrel pump is converted to low temperature liquid cooling by control cooling medium processing unit
Medium is to recycle.
Natural gas can be pre-chilled in the pre- cooling control method of natural gas provided in an embodiment of the present invention, natural after pre-cooling
The liquefied fraction of natural gas can be improved when being liquefied for gas, reduces circulating air, reduces the liquefaction cost of natural gas.
Referring to Fig. 4, showing another process signal of the pre- cooling control method of natural gas provided in an embodiment of the present invention
Figure, the pre- cooling control method are applied to a pre-cooler, and pre-cooler includes barrel pump, canned motor pump, heat exchanger, screw-compression
Machine, refrigerated separation equipment, oil storage tank, fluid reservoir, economizer, main supplying valve and oil pump, the pre- cooling control method may include:
Step S401: the low temperature liquid cooling medium in barrel pump is delivered to cold box system front end by control canned motor pump.
Step S402: control heat exchanger is pre-chilled using natural gas of the low temperature liquid cooling medium to cold box system front end
Processing, to export the natural gas and gaseous cooling medium of preset temperature, and by the natural gas transportation of preset temperature to cold box system
High-pressure jet is carried out, gaseous cooling medium is delivered to barrel pump.
Step S403: control screw compressor absorbs the lubricating oil one in gaseous cooling medium and oil storage tank in barrel pump
It rises and is pressurized to default pressure.
Step S404: pressurized lubricating oil and gaseous cooling medium are carried out cooling treatment by control refrigerated separation equipment,
Lubricating oil and liquid cooling medium are isolated from the lubricating oil and liquid cooling medium that cooling treatment obtains, and lubricating oil is defeated
It send to oil storage tank, liquid cooling medium is delivered to fluid reservoir.
Step S405: control economizer cools down the liquid cooling medium in fluid reservoir cooling to export low temperature liquid
Medium, and control main supplying valve and open, so that low temperature liquid cooling medium is input to barrel pump storage to recycle.
Step S406: control oil pump carries out pressurized treatments to the lubricating oil in oil storage tank to recycle.
Method provided in an embodiment of the present invention further include: the pressure in control barrel pump maintains in pre-set pressure range.Tool
Body, control screw compressor absorbs the gaseous cooling medium in barrel pump, maintains the pressure of barrel pump by adjusting load position
In pre-set pressure range, when being cooled down using the low temperature liquid cooling medium in barrel pump to natural gas to control heat exchanger,
Natural gas is cooled to preset temperature.
Illustratively, cooling medium is freon, and the pressure in barrel pump maintains in pre-set pressure range, such as 0.020
~0.022, when natural gas is pre-chilled using the low temperature liquid freon in barrel pump, the natural gas after can making pre-cooling reaches
To preset temperature value, such as 0 DEG C, the natural gas of 20Mpa is cooled to -40 DEG C in advance.
Below by taking cooling medium is freon as an example, provides and pre-cooling control is carried out with to 40 DEG C to pre-cooler, 20Mpa's
The detailed process that natural gas is pre-chilled:
Low temperature liquid freon is stored in barrel pump.The low temperature liquid freon that canned motor pump will be stored in barrel pump is controlled first
(liquid level is between 100mm~570mm) is sent to cold box system front end, then controls heat exchanger to 40 DEG C, the natural gas of 20Mpa
It is pre-chilled, natural gas is cooled to -40 DEG C in advance, -40 DEG C of natural gas carries out high-frequency jet, and the freon of low temperature liquid exchanges heat
After become room temperature gaseous state freon, gaseous state freon returns to barrel pump.
Then, the gaseous state freon in control screw compressor absorption barrel pump and lubricating oil are pressurized to 1.0Mpa together,
Then freon and lubricating oil separation are come by refrigerated separation, lubricating oil, which enters after oil storage tank is pressurized by oil pump, to be recycled
It utilizes, the liquid freon of the 1.0Mpa isolated is stored in fluid reservoir.
Finally, control economizer carries out cooling processing to the 1.0Mpa liquid freon in fluid reservoir and exports low temperature liquid
Freon, the low temperature liquid freon of output, which is sent after the throttling of main liquid supply electromagnetic valve to barrel pump, to be stored.
In addition, control screw compressor absorbs the gaseous state freon in barrel pump, and pass through adjusting screw rod formula compressor
Position is carried, the pressure of barrel pump is controlled such as 0.020~0.022 in a pressure limit, that is, can guarantee the Low Temperature Liquid for being stored in barrel pump
The freon of state finally with 40 DEG C, when the natural gas of 20Mpa is pre-chilled, by 40 DEG C, the natural gas of 20Mpa is cooled to -40 DEG C in advance
Natural gas,
40 DEG C, the natural gas of 20Mpa carries out high-pressure jet after pre-cooler is pre-chilled to -40 DEG C, into cold box system
When, 1/3 flow generates liquified natural gas, and 2/3 circulating air turns again to compressor and is recycled.That is, with existing skill
Art is compared, and the liquefied fraction of natural gas improves, and circulating air is reduced, and reduces the liquefaction cost of natural gas.
It should be noted that detecting the liquid level in barrel pump before control shields pump startup, judge that the liquid level in barrel pump is
It is no less than the first preset value；When the liquid level in barrel pump is less than the first preset value, controls main supplying valve and open so that cooling medium mentions
Low temperature liquid cooling medium is added to barrel pump for device (such as economizer), when the liquid level in barrel pump is greater than the second preset value, control
System shielding pump startup.
Natural gas can be pre-chilled in the pre- cooling control method of natural gas provided in an embodiment of the present invention, natural after pre-cooling
The liquefied fraction of natural gas can be improved when being liquefied for gas, reduces circulating air, reduces the liquefaction cost of natural gas.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
In several embodiments provided herein, it should be understood that disclosed method, apparatus and equipment, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.In addition, the functional units in various embodiments of the present invention may be integrated into one processing unit, it is also possible to each
Unit physically exists alone, and can also be integrated in one unit with two or more units.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (6)
1. a kind of pre-cooler of natural gas, which is characterized in that the pre-cooler of the natural gas includes: barrel pump, canned motor pump, changes
Hot device and cooling medium processing unit；
The barrel pump, for storing low temperature liquid cooling medium；
The canned motor pump, for sending the low temperature liquid cooling medium in the barrel pump to cold box system front end；
The heat exchanger, it is pre- for being cooled to the natural gas of the cold box system front end in advance using the low temperature liquid cooling medium
If temperature, and the natural gas transportation after pre-cooling to the cold box system is subjected to high-pressure jet, gaseous cooling medium is delivered to
The barrel pump is converted to the gaseous cooling medium after the pre-cooled processing of low temperature liquid cooling medium；
The cooling medium processing unit, it is cooling for the gaseous cooling medium in the barrel pump to be converted to low temperature liquid
Medium is to recycle；
Liquid level detector, for detecting the liquid level in the barrel pump, so that cooling medium provides liquid of the device in the barrel pump
The low temperature liquid cooling medium is added to the barrel pump when position is less than preset value；
The cooling medium processing unit include: screw compressor, refrigerated separation equipment, oil storage tank, fluid reservoir, economizer and
Oil pump；
The oil storage tank, for storing lubricating oil；
The screw compressor, for absorbing the gaseous cooling medium in the barrel pump and the lubrication in the oil storage tank
Oil is pressurized to default pressure together；
The refrigerated separation equipment, for the gaseous cooling medium of the lubricating oil and default pressure to be carried out cooling treatment, from
The lubricating oil and the default pressure are isolated in the liquid cooling medium of lubricating oil and default pressure that cooling treatment obtains
Liquid cooling medium, and the lubricating oil is delivered to the oil storage tank, the liquid cooling medium of the default pressure is defeated
It send to the fluid reservoir；
The economizer carries out cooling processing for the liquid cooling medium to the default pressure in the fluid reservoir, and
Cooling is handled to obtain low temperature liquid cooling medium and is delivered to the barrel pump storage through main supplying valve to recycle；
The oil pump is recycled for being pressurized to the lubricating oil in the oil storage tank.
2. pre-cooler according to claim 1, which is characterized in that the screw compressor is also used to absorb described
The gaseous cooling medium in barrel pump maintains the pressure of the barrel pump in pre-set pressure range by adjusting load position, with
When toilet is stated heat exchanger and cooled down using the low temperature liquid cooling medium to the natural gas, the natural gas is cooled to
Preset temperature.
3. pre-cooler described in any one of -2 according to claim 1, which is characterized in that the cooling medium is fluorine benefit
It is high.
4. a kind of pre- cooling control method of natural gas, which is characterized in that be applied to a pre-cooler, the pre-cooler includes:
Canned motor pump, barrel pump, heat exchanger and cooling medium processing unit, which comprises
It controls the canned motor pump and the low temperature liquid cooling medium in the barrel pump is delivered to cold box system front end；
The heat exchanger is controlled to be pre-chilled using natural gas of the low temperature liquid cooling medium to the cold box system front end
Processing, to export the natural gas and gaseous cooling medium of preset temperature, and by the natural gas transportation of the preset temperature to described
Cold box system carries out high-pressure jet, and the gaseous cooling medium is delivered to the barrel pump；
It controls the cooling medium processing unit and the gaseous cooling medium in the barrel pump is converted into the low temperature liquid
Cooling medium is to recycle；
Before controlling the shielding pump startup, the method also includes:
Detect the liquid level in the barrel pump；
Judge the liquid level in the barrel pump whether less than the first preset value；
When the liquid level in the barrel pump is less than first preset value, controls main supplying valve and open so that cooling medium provides device
The low temperature liquid cooling medium is added to the barrel pump；
When the liquid level in the barrel pump is greater than the second preset value, the shielding pump startup is controlled；
The cooling medium processing unit include: screw compressor, refrigerated separation equipment, oil storage tank, fluid reservoir, economizer and
Oil pump；
It controls the cooling medium processing unit and the gaseous cooling medium in the barrel pump is converted into the low temperature liquid
Cooling medium is to recycle, comprising:
It controls the screw compressor and absorbs the gaseous cooling medium in the barrel pump and the lubrication in the oil storage tank
Oil is pressurized to default pressure together；
It controls the refrigerated separation equipment and the gaseous cooling medium of the lubricating oil and default pressure is subjected to cooling treatment, from cold
But the lubricating oil and the default pressure are isolated in the liquid cooling medium of the lubricating oil and default pressure that handle
Liquid cooling medium, and the lubricating oil is delivered to the oil storage tank, the liquid cooling medium of the default pressure is conveyed
To the fluid reservoir；
It controls the economizer liquid cooling medium in the fluid reservoir cools down to export the low temperature liquid
Cooling medium, and control main supplying valve and open, so that the low temperature liquid cooling medium is input to the barrel pump storage to recycle
It utilizes；
It controls the oil pump and pressurized treatments is carried out to the lubricating oil in the oil storage tank to recycle.
5. according to the method described in claim 4, it is characterized in that, the method also includes:
It controls the screw compressor and absorbs the gaseous cooling medium in the barrel pump, carry position by adjusting and make the bucket
The pressure of pump maintains in pre-set pressure range, to control the heat exchanger using the low temperature liquid cooling medium to described
When natural gas is cooled down, the natural gas is cooled to preset temperature.
6. according to the method described in claim 4, it is characterized in that, the cooling medium is freon.
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| CN108506726B (en) * | 2018-04-11 | 2024-01-19 | 青岛乐戈新能源科技有限公司 | Unloading system and unloading method of low-temperature liquid tank car |
| CN112413407B (en) * | 2019-08-22 | 2023-12-19 | 中集船舶海洋工程设计研究院有限公司 | Fuel supply system and fuel supply method |
| CN114508898B (en) * | 2022-01-27 | 2023-06-30 | 广州兴丰能源科技有限公司 | Cold box precooling equipment for liquefying natural gas for chemical industry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5715200A (en) * | 1980-07-01 | 1982-01-26 | Hitachi Zosen Corp | Boil off gas processing method |
| EP2041505A2 (en) * | 2006-07-18 | 2009-04-01 | NTNU Technology Transfer AS | Apparatus and methods for natural gas transportation and processing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2993643B1 (en) * | 2012-07-17 | 2014-08-22 | Saipem Sa | NATURAL GAS LIQUEFACTION PROCESS WITH PHASE CHANGE |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5715200A (en) * | 1980-07-01 | 1982-01-26 | Hitachi Zosen Corp | Boil off gas processing method |
| EP2041505A2 (en) * | 2006-07-18 | 2009-04-01 | NTNU Technology Transfer AS | Apparatus and methods for natural gas transportation and processing |
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