CN105387682B - Low-boiling point gas is liquefied and low-temperature (low temperature) vessel BOG is reclaimed and the method and device of supercharging - Google Patents
Low-boiling point gas is liquefied and low-temperature (low temperature) vessel BOG is reclaimed and the method and device of supercharging Download PDFInfo
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- CN105387682B CN105387682B CN201510959495.5A CN201510959495A CN105387682B CN 105387682 B CN105387682 B CN 105387682B CN 201510959495 A CN201510959495 A CN 201510959495A CN 105387682 B CN105387682 B CN 105387682B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000009835 boiling Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 238000009833 condensation Methods 0.000 claims abstract description 6
- 230000005494 condensation Effects 0.000 claims abstract description 6
- 230000008676 import Effects 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000004781 supercooling Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 239000000178 monomer Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000007717 exclusion Effects 0.000 claims 1
- 238000003860 storage Methods 0.000 abstract description 27
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000001112 coagulating effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 90
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000012071 phase Substances 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003949 liquefied natural gas Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 230000006837 decompression Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000306 recurrent effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- F25J1/0201—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 only internal refrigeration means, i.e. without external refrigeration
-
- 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
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0249—Controlling refrigerant inventory, i.e. composition or quantity
-
- 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
- F25J1/0254—Operation; Control and regulation; Instrumentation controlling particular process parameter, e.g. pressure, temperature
Abstract
The method and device with supercharging is reclaimed the present invention relates to a kind of liquefaction of low-boiling point gas and low-temperature (low temperature) vessel BOG, it is intended to liquefied low pressure gas at normal temperature with compressor and is compressed into medium pressure gas, middle normal pressure and temperature gas is cooled to by usual heat exchanger, the low temperature gas that the gas is extracted out in cold heat exchanger is crossed with cryogenic liquid storage tank gas-phase space again enters line retrace heat exchange, cold air is pressed through in being changed into, after further cooling through expenditure and pressure again, it is passed through in the liquefied liquid of low-temperature (low temperature) vessel, is mixed with cryogenic liquid, direct heat transfer condensation liquefaction.Partially absorb not coagulating for cryogenic liquid cold energy and cold heat exchanger was pumped at the top of gas from vessel, be changed into gas at normal temperature after cooling compression after normal temperature medium pressure gas, then through sending into compressor.It can be used for low-temperature (low temperature) vessel BOG to liquefy during without virgin gas and reclaim and be embodied as under back flow of gas journey low-temperature (low temperature) vessel Quick-pressurizing.Present invention process is simple, and low cost is reliable, and system energy consumption is low.
Description
Technical field
The method and device with supercharging is reclaimed the present invention relates to a kind of liquefaction of low-boiling point gas and low-temperature (low temperature) vessel BOG, is belonged to
Cryogenic refrigeration and cryogenic liquid production technical field.
Background technology
Gas of the critical-temperature less than 50 DEG C, typically can not directly simple refrigerating fluid because liquefaction point temperature is low in liquefaction
Change, generally require multi-stage compression and the refrigeration cooling condensation of other media, could realize its it is final liquefy, its often technique it is very multiple
Miscellaneous, cost is high.
Low boiling liquid gas inevitably produces boil-off gas in storing process simultaneously（Abbreviation BOG gases）,
If this portion gas is without processing, low-temperature (low temperature) vessel internal pressure more and more higher, influence safety can be made；But this BOG gas
Body is again smaller because of the amount of generation, can not be recycled because prior art cost is high, most of directly to be discharged, and produces resource
Waste, potential safety hazard and environmental pollution.
The recycling of existing low-boiling point gas, some direct boil down to gases at high pressure of use compressor are transported through or profit
With this method subject matter is that space-consuming is not easy to greatly store and transport.What is had also uses liquefied method, in existing liquid
Mainly there is following technology path in change method：
（1）Gas at normal temperature is compressed to by high-temperature high-pressure state using high pressure compressor, then with multi-group heat exchanger and non-equality of temperature
Spend multigroup cooler and refrigeration unit progressively to cool under the condensing temperature of low-boiling point gas high pressure-temperature, carry out throttling system
It is cold.
（2）Low boiling gas at normal temperature is compressed to after HTHP using compressor, heat exchange is cooled to after normal temperature to be saved step by step
Stream or expansion cooling finally realize condensation liquefaction.
（3）Low boiling gas at normal temperature is compressed to after HTHP using compressor and directly uses turbine expander refrigeration.
（4）Cooled using cheap more low temperature cold source medium direct heat transfer and condensed（Such as use liquid nitrogen）.
（5）After the preliminary heat exchange of compression, compound-refrigerating working medium is used, using the heterogeneity of each working medium, is produced different step by step
Cold energy cooling is intended to liquefied gas, finally realizes condensation liquefaction purpose.
（6）Decompression liquefaction is directly compressed using special low-temp compressor.
Any of the above method and technique, or complicated involve great expense or operating difficulties or device fabrication are tired
It is difficult or operating cost is too high there is certain difficulty.
The content of the invention
The present invention in view of the above-mentioned problems, a kind of easy, cheap, more efficient low-boiling point gas liquefaction for providing and
Low-temperature (low temperature) vessel BOG reclaims the method and device with supercharging.
The present invention solve its technical problem use technical scheme be：
A kind of low-boiling point gas liquefaction and low-temperature (low temperature) vessel BOG reclaim the method with supercharging, comprise the steps：
Liquefied low pressure gas at normal temperature is intended to compressor and is compressed into middle super pressure-high temperature gas；Super pressure-high temperature gas in this is passed through
Usual heat exchanger is cooled to middle normal pressure and temperature gas；Normal pressure and temperature gas in this is utilized into the cryogenic gas extracted out by low-temperature (low temperature) vessel in mistake
Cold air liquid mixture is pressed through in being further cooled in cold heat exchanger；Cold air liquid mixture will be pressed through in this after reducing pressure by regulating flow,
It is passed into low-temperature (low temperature) vessel in liquefied cryogenic liquid, with the direct mixed heat transfer of cryogenic liquid, expansion cooling, condensation liquefaction；
Synchronous with this, the gas that do not coagulate for having partially absorbed cryogenic liquid cold energy in low-temperature (low temperature) vessel is taken out at the top of low-temperature (low temperature) vessel
To crossing in cold heat exchanger, with the middle normal pressure and temperature gas heat exchange after cooling compression it is changed into that medium pressure gas is subcooled, then through control valve control
System feeding compressor inlet, and re-compressed together with entering the new gas of compressor inlet as middle super pressure-high temperature gas, it is past
Multiple circulation；
The new gas inlet valve of close compressor, system only with gas circulation cooling liquefaction in low-temperature (low temperature) vessel, realizes that BOG is returned
Receive and supercharging.
Further, by being adjusted into the ratio of cryogenic gas in the new gas and pumpback low-temperature (low temperature) vessel of compressor, control
Gas liquefaction temperature processed and new gas liquefaction speed.
Further, by detecting and controlling low-temperature (low temperature) vessel internal pressure, the fixed gas in liquefaction process is excluded.
Further, by advance by the preset liquefied liquid for being intended to gas recovery or other and to be liquefied in low-temperature (low temperature) vessel
The method of the compatible cryogenic liquid of gas, drives for initial system.
Further, passed through by controlling Vavle switching compressor to import and export liquid in gas flow, the low-temperature (low temperature) vessel of extraction
Heat exchange is compressed into middle super pressure-high temperature gas, is sent to low-temperature (low temperature) vessel gas-phase space, is low-temperature (low temperature) vessel rapid temperature-raising.
It is a kind of to be liquefied for low-boiling point gas and low-temperature (low temperature) vessel BOG recovery and the device being pressurized, including：
Compressor, usual heat exchanger crosses gas inlet in cold heat exchanger, low-temperature (low temperature) vessel, expenditure and pressure device, low-temperature (low temperature) vessel
Valve, new gas inlet valve, and air flow direction control valve；
The middle super pressure-high temperature gas vent of compressor connects the tube side import of usual heat exchanger, the tube side outlet of usual heat exchanger
The tube side import of cold heat exchanger was connected, the tube side outlet connection expenditure and pressure device import of cold heat exchanger is crossed, expenditure and pressure device goes out
Mouth connection air duct, air duct enters inside low-temperature (low temperature) vessel, the cryogenic liquid bottom that its port of export is stretched into low-temperature (low temperature) vessel；
The shell side import for crossing cold heat exchanger is connected with the gas-phase space inside low-temperature (low temperature) vessel by pump-line, supercooling heat exchange
The shell-side outlet of device connects the air inlet of compressor by gas inlet valve in low-temperature (low temperature) vessel；
The air inlet oral area of compressor is provided with new gas inlet valve；
Airflow line is connected between the tube side import of the air inlet and usual heat exchanger of compressor and equipped with the first air-flow
Flow direction control valve；The outlet oral area of compressor is equipped with the second air flow direction control valve；The gas outlet of compressor is with crossing cold heat exchanger
Shell-side outlet between be connected with airflow line and equipped with the 3rd air flow direction control valve.
Further, it is monomer or one group of heat exchanger to cross cold heat exchanger, and the tube side import for crossing cold heat exchanger goes out higher than tube side
Medium pressure gas in mouth position, and the shell side of mistake cold heat exchanger in the tube side of pumpback cold air and cold heat exchanger is in reverse flow.
Further, expenditure and pressure device is that expanding machine, choke valve, control valve or one section of reducing damper tube, orifice plate are constituted
Any of which dropping equipment.
Further, the compressor is normal temperature compressed machine or normal-temperature vacuum compressor, and overall compression ratio is 3-50 or compression
For rear medium pressure gas pressure 1.6-6mpa.
Further, low-temperature (low temperature) vessel is provided with overflow pipe.Overflow pipe is used for gas liquefaction flow, is reclaimed in BOG with being pressurized
Using when, low-temperature (low temperature) vessel can not set overflow pipe.
Using the present invention of above-mentioned technical proposal, compared with prior art, its advantage is：
The present invention is only with the gas that is liquefied in itself as refrigerant, without the consumption of other refrigeration working mediums, and using in routine
Compressor is pressed, technique is simple, and low cost is reliable, and system energy consumption is low, initial liquefaction or storage available for various cryogenic gases
Deposit container B OG re-liquefied recovery and Quick-pressurizing.
Brief description of the drawings
Fig. 1 is that the present invention is used for the liquefying plant schematic diagram of natural gas；
Fig. 2 is that the present invention is used for the BOG retracting device schematic diagrames of LNG storage tank；
In figure：1- compressors；2- usual heat exchangers；3- crosses cold heat exchanger；4- low-temperature liquefaction storage tanks；5- overflow pipes；6- is saved
Flow pressure reducer；Gas inlet valve in 7- low-temperature (low temperature) vessels；The new gas inlet valves of 8-；9- pump-lines；10- air ducts；11- first
Air flow direction control valve；12- the second air flow direction control valves；The air flow direction control valves of 13- the 3rd.
Embodiment
The present invention is further elaborated with reference to embodiments, but the present embodiment does not constitute any limitation to the present invention.
Embodiment 1：Liquefaction for natural gas.
Referring to Fig. 1, compressor 1 is normal temperature compressed machine；Usual heat exchanger 2 uses water cooling heat exchanger, and shell side is cooling water；Cross
Cold heat exchanger 3 is vertically arranged tubular heat exchanger.
The middle super pressure-high temperature gas vent of compressor 1 connects the tube side import of usual heat exchanger 2, the tube side of usual heat exchanger 2
Outlet connected the tube side import of cold heat exchanger 3（Tube side import was located at the top of cold heat exchanger 3）, cross the pipe of cold heat exchanger 3
The import of journey outlet connection expenditure and pressure device 6, expenditure and pressure device 6 uses throttling control valve, is depressurized to its outlet pressure and compares low temperature
In the slightly higher pressure value of liquid phase pressure of storage tank 4 that liquefies；The outlet of expenditure and pressure device 6 connection air duct 10, air duct 10 enters low
Inside temperature liquefaction storage tank 4, the cryogenic liquid bottom that its port of export is stretched into low-temperature liquefaction storage tank 4；Low-temperature liquefaction storage tank 4 is provided with
Overflow pipe 5.
The shell side import for crossing cold heat exchanger 3 is connected with the gas-phase space inside low-temperature liquefaction storage tank 4 by pump-line 9,
The shell-side outlet for crossing cold heat exchanger 3 connects the air inlet of compressor 1 by gas inlet valve 7 in low-temperature (low temperature) vessel；Compressor 1 enters
Gas port portion is additionally provided with new gas inlet valve 8.
Specifically liquefaction process is：
Add people into low-temperature liquefaction storage tank 4 liquefied gas at low temp first, liquid level has liquid flow to do well to overflow pipe 5；
New gas inlet valve 8 is opened, normal temperature compressed machine 1 is opened, the super cold air of the gas-phase space of low-temperature liquefaction storage tank 4 is extracted out and come
Cold heat exchanger 3, while starting usual heat exchanger 2, is allowed to cool medium and is in recurrent state, it is ensured that usual heat exchanger 2 is in good
Good radiating state.
If pressure is then turned on gas inlet valve 7 in low-temperature (low temperature) vessel less than pressure value is set in low-temperature liquefaction storage tank 4
Also open new gas inlet valve 8 simultaneously, by the pure natural gas after processing by new gas inlet valve 8 with from low-temperature liquefaction storage tank
That is extracted out in 4 is too cold the gas mixing of the heating of heat exchanger 3, and high temperature medium pressure gas is compressed into jointly, is cooled down through usual heat exchanger 2
For normal temperature medium pressure gas, it was re-fed into cold heat exchanger 3 and continues to cool cold air is pressed through in, which part, which is condensed, is formed
Gas-liquid mixture, the gas-liquid mixture is again lower liquid pressure in slightly above low-temperature liquefaction storage tank 4 through the decompression of pressure reducer 6 that throttles
Pressure, makes more gas-condensate liquids, and then the gas-liquid mixture is passed into liquefier in the lower low-temperature liquefaction storage tank 4 of temperature
In body, condensed with the direct mixed heat transfer of original liquefied liquid, cooling, the gas that part is not condensed is raised to tank top with cold energy
Gas-phase space, from tank top be sucked out as refrigeration working medium entered cold heat exchanger 3 there is provided supercooling cold energy, continue cycling through.
If in the liquefaction cycles of gas, the internal pressure of low-temperature liquefaction storage tank 4 is higher than the upper pressure limit value set
When, show that the fresh natural gas that is passed through by new gas inlet valve 8 is excessive or inside can not liquefied fixed gas excessive concentration,
Then automatically control and turn down the valve flow, if new gas inlet valve 8 exceedes certain time, low-temperature liquefaction storage tank 4 after completely closing
Interior pressure is still too high or pressure reduces when not reaching arranges value, then shows internal fixed gas excessive concentration, it is impossible to liquefy, this
When manually or automatically can discharge on-condensible gas before valve 7 by air bleeding valve., it is further continued for after tank internal pressure is less than lower limit
Liquefaction cycle process.Overflow pipe 5 is used to discharge the liquefied liquid that has been condensed, and maintains the liquid level of low-temperature storage tank 4 in definite value
On.
Embodiment 2：BOG for LNG storage tank is reclaimed.
Referring to Fig. 2, the overall structure of device is substantially the same manner as Example 1, and its main distinction is：Inputted without virgin gas, no
If fresh gas control valve 8；And it is connected with airflow line between the tube side import of the air inlet and usual heat exchanger 2 of compressor 1
And equipped with the first air flow direction control valve 11；Second air flow direction control valve 12 is housed in the outlet oral area of compressor 1；In compression
Airflow line is connected between the gas outlet of machine 1 and the shell-side outlet for crossing cold heat exchanger 3 and equipped with the 3rd air flow direction control valve
13。
Its groundwork process is same as Example 1, mainly can switch the stream of the inlet and outlet air-flow of compressor 1
To because the system is only used for liquid evaporator gas in low-temperature liquefaction storage tank 4（BOG）Recovery and internal pressurization, therefore rise liquid level
The overflow pipe 5 of pressure stabilization function is also cancelled.
Specific work process is：
For BOG recovery process：The first air flow direction of closing control valve control valve 11, the 3rd air flow direction control valve 13,
Open the second air flow direction control valve 12, gas inlet valve 7 in low-temperature (low temperature) vessel, its medium flow, liquefaction cycle process are with implementing
Example is identical, no longer describes herein.
For being pressurized in low-temperature liquefaction storage tank 4：Close the second air flow direction control valve 12, gas inlet valve in low-temperature (low temperature) vessel
7, open the first air flow direction control valve 11, the 3rd air flow direction control valve 13, open expenditure and pressure device 6, its medium flow direction with
The flow contrast of embodiment 1.After now compressor 1 is opened, the air inlet of compressor 1 by the first air flow direction control valve 11 with
Usual heat exchanger 2 is connected, under the swabbing action of compressor 1, and usual heat exchanger 2, the excessively pressure of cold heat exchanger 3 are below throttling and subtracted
The pressure of depressor 6, the more below internal pressure of low-temperature liquefaction storage tank 4, now flow is that the internal liquid of low-temperature liquefaction storage tank 4 is sucked into
Expenditure and pressure device 6, enters then in turn through cold heat exchanger 3, usual heat exchanger 2, the first air flow direction control valve 11 to compressor 1
Gas port, in the process cryogenic liquid can vaporize and be warming up to close to normal temperature state in heat exchanger.
Now close to normal temperature gas compressed by compressor 1 after further heat up, export and discharge from compressor 1, by the
Three air flow direction control valves 13 arrived the shell side of cold heat exchanger 3, and partial heat is transmitted to the liquid cooling decompression to be vaporized, but pressure
With temperature still higher than the gas pressure and temperature of gas-phase space in low-temperature liquefaction storage tank 4, this gas is pressed into low-temperature liquefaction
Heated in storage tank 4 to container rapidly.
A tractor serves several purposes can be thus realized, can both have been liquefied for low-temperature (low temperature) vessel BOG and carry out the use of stable container internal pressure
On the way, while also realizing the purpose of rapid high-efficient pressurizing during the hypotony in low-temperature (low temperature) vessel.
Control liquefied liquid temperature：If fluid temperature is raised after liquefaction, drive gas inlet valve 7 in big low-temperature (low temperature) vessel and flow
Amount, while turning down the new flow of gas inlet valve 8, can control the fluid temperature after liquefaction.
Exclude fixed gas：In the state of new gas inlet valve 8 is closed, low-temperature liquefaction storage tank after setting time is run more than
When pressure remains above arranges value in 4, container gas-phase space fixed gas concentration over-standard is judged to, the method for carrying out part dissipation processing.
The method of driving is：People is first noted in low-temperature liquefaction storage tank 4 identical with the gas componant being liquefied or permission generation
With low-temperature liquefaction liquid to standard liquid level（The liquid that can be such as inserted in advance in low-temperature (low temperature) vessel 4 in liquefied natural gas flow can be with
It is that low temperature LNG can also use liquid nitrogen）, then gas inlet valve 7, new gas inlet valve 8 and compressor 1 in low-temperature (low temperature) vessel, i.e.,
It can be started shooting by normal step.
Preferable feasible embodiment of the invention is the foregoing is only, not thereby limits to the interest field of the present invention,
Within the equivalence changes that all utilization present specifications are made, the interest field for being both contained in the present invention.
Claims (10)
1. a kind of low-boiling point gas liquefaction and low-temperature (low temperature) vessel BOG reclaim the method with supercharging, it is characterised in that including following steps
Suddenly：
Liquefied low pressure gas at normal temperature is intended to compressor and is compressed into middle super pressure-high temperature gas；Super pressure-high temperature gas in this is passed through into routine
Heat exchanger is cooled to middle normal pressure and temperature gas；The cryogenic gas extracted out by low-temperature (low temperature) vessel is utilized to be changed in supercooling normal pressure and temperature gas in this
Cold air liquid mixture is pressed through in being further cooled in hot device；Cold air liquid mixture will be pressed through in this after reducing pressure by regulating flow, is passed through
In to low-temperature (low temperature) vessel in liquefied cryogenic liquid, with the direct mixed heat transfer of cryogenic liquid, expansion cooling, condensation liquefaction；
Synchronous with this, the gas that do not coagulate for having partially absorbed cryogenic liquid cold energy in low-temperature (low temperature) vessel was pumped at the top of low-temperature (low temperature) vessel
In cold heat exchanger, it is changed into that medium pressure gas is subcooled with the middle normal pressure and temperature gas heat exchange after cooling compression, then send through control valve control
Enter compressor inlet, and re-compress together with entering the new gas of compressor inlet as middle super pressure-high temperature gas, back and forth follow
Ring；
The new gas inlet valve of close compressor, system only with gas circulation cooling liquefaction in low-temperature (low temperature) vessel, realize BOG reclaim with
Supercharging.
2. low-boiling point gas liquefaction according to claim 1 and low-temperature (low temperature) vessel BOG reclaim the method with supercharging, its feature exists
In by being adjusted into the ratio of cryogenic gas in the new gas and pumpback low-temperature (low temperature) vessel of compressor, control gas liquefaction temperature
With new gas liquefaction speed.
3. low-boiling point gas liquefaction according to claim 1 and low-temperature (low temperature) vessel BOG reclaim the method with supercharging, its feature exists
In by detecting and controlling the fixed gas in low-temperature (low temperature) vessel internal pressure, exclusion liquefaction process.
4. low-boiling point gas liquefaction according to claim 1 and low-temperature (low temperature) vessel BOG reclaim the method with supercharging, its feature exists
In by advance by the preset liquefied liquid or other low temperature compatible with gas to be liquefied for being intended to gas recovery in low-temperature (low temperature) vessel
The method of liquid, drives for initial system.
5. low-boiling point gas liquefaction according to claim 1 and low-temperature (low temperature) vessel BOG reclaim the method with supercharging, its feature exists
In by controlling liquid in the import and export gas flow of Vavle switching compressor, the low-temperature (low temperature) vessel of extraction to be compressed into middle pressure by heat exchange
High-temperature gas, is sent to low-temperature (low temperature) vessel gas-phase space, is low-temperature (low temperature) vessel rapid temperature-raising.
6. a kind of low-boiling point gas liquefaction and low-temperature (low temperature) vessel BOG for described in claim 1-5 any one is reclaimed and supercharging
Method device, it is characterised in that：
Including：Compressor（1）, usual heat exchanger（2）, cross cold heat exchanger（3）, low-temperature (low temperature) vessel（4）, expenditure and pressure device（6）, low temperature
Gas in container intake valve（7）, new gas inlet valve（8）, and air flow direction control valve；
Compressor（1）Middle super pressure-high temperature gas vent connection usual heat exchanger（2）Tube side import, usual heat exchanger（2）Pipe
Journey outlet connected cold heat exchanger（3）Tube side import, cross cold heat exchanger（3）Tube side outlet connection expenditure and pressure device（6）Enter
Mouthful, expenditure and pressure device（6）Outlet connection air duct（10）, air duct（10）Into low-temperature (low temperature) vessel（4）Inside, its port of export
Stretch into low-temperature (low temperature) vessel（4）Interior cryogenic liquid bottom；
Cross cold heat exchanger（3）Shell side import and low-temperature (low temperature) vessel（4）Internal gas-phase space passes through pump-line（9）Connection, mistake
Cold heat exchanger（3）Shell-side outlet pass through gas inlet valve in low-temperature (low temperature) vessel（7）Connect compressor（1）Air inlet；
Compressor（1）Air inlet oral area be provided with new gas inlet valve（8）；
Compressor（1）Air inlet and usual heat exchanger（2）Tube side import between be connected with airflow line and equipped with the first gas
Flow flow direction control valve（11）；Compressor（1）Outlet oral area be equipped with the second air flow direction control valve（12）；Compressor（1）Go out
Gas port is with crossing cold heat exchanger（3）Shell-side outlet between be connected with airflow line and equipped with the 3rd air flow direction control valve（13）.
7. low-boiling point gas liquefaction according to claim 6 and low-temperature (low temperature) vessel BOG reclaim the device with supercharging, its feature exists
In mistake cold heat exchanger（3）For monomer or one group of heat exchanger, cold heat exchanger is crossed（3）Tube side import be higher than tube side outlet port, and
Cross cold heat exchanger（3）Shell side in pumpback cold air and cold heat exchanger（3）Tube side in medium pressure gas be in reverse flow.
8. low-boiling point gas liquefaction according to claim 6 and low-temperature (low temperature) vessel BOG reclaim the device with supercharging, its feature exists
In expenditure and pressure device（6）It is expanding machine, choke valve, control valve or one section of reducing damper tube, any of which of orifice plate composition
Dropping equipment.
9. low-boiling point gas liquefaction according to claim 6 and low-temperature (low temperature) vessel BOG reclaim the device with supercharging, its feature exists
In the compressor is normal temperature compressed machine or normal-temperature vacuum compressor, and overall compression ratio is medium pressure gas pressure after 3-50 or boil down to
Power 1.6-6mpa.
10. low-boiling point gas liquefaction according to claim 6 and low-temperature (low temperature) vessel BOG reclaim the device with supercharging, its feature
It is, low-temperature (low temperature) vessel（4）It is provided with overflow pipe（5）.
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| CN201510959495.5A CN105387682B (en) | 2015-12-21 | 2015-12-21 | Low-boiling point gas is liquefied and low-temperature (low temperature) vessel BOG is reclaimed and the method and device of supercharging |
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| CN201510959495.5A CN105387682B (en) | 2015-12-21 | 2015-12-21 | Low-boiling point gas is liquefied and low-temperature (low temperature) vessel BOG is reclaimed and the method and device of supercharging |
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| CN112254435B (en) * | 2020-09-29 | 2022-08-05 | 北京航天发射技术研究所 | Deep supercooling liquid oxygen preparation system and preparation method |
| CN112556229A (en) * | 2020-12-08 | 2021-03-26 | 江西远大科技有限公司 | Throttling and pressure-stabilizing refrigerating device of ultralow-temperature refrigerating equipment |
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| GB800267A (en) * | 1956-06-11 | 1958-08-20 | British Oxygen Co Ltd | Method of and apparatus for producing liquefied gas from gas stored under pressure |
| JP3656128B2 (en) * | 1992-03-23 | 2005-06-08 | 大阪瓦斯株式会社 | Method and apparatus for storing and effectively utilizing LNG cold energy |
| FR2775512B1 (en) * | 1998-03-02 | 2000-04-14 | Air Liquide | STATION AND METHOD FOR DISTRIBUTING A EXPANDED GAS |
| US6085547A (en) * | 1998-09-18 | 2000-07-11 | Johnston; Richard P. | Simple method and apparatus for the partial conversion of natural gas to liquid natural gas |
| CN203249465U (en) * | 2013-05-06 | 2013-10-23 | 天津德申燃气设备有限公司 | BOG reliquefaction device |
| CN104792114B (en) * | 2015-04-10 | 2017-11-07 | 四川金科深冷设备工程有限公司 | The re-liquefied techniques of BOG and its re-liquefied recovery system |
| CN104913593B (en) * | 2015-05-15 | 2018-07-24 | 新地能源工程技术有限公司 | A kind of liquefied technique of BOG and device |
| CN205209070U (en) * | 2015-12-21 | 2016-05-04 | 刘印同 | Low boiling gas liquefaction and low temperature container BOG retrieve device with pressure boost |
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