CN107620863A - A kind of re-liquefied systems of hydro carbons BOG and technique peculiar to vessel of liquefying - Google Patents
A kind of re-liquefied systems of hydro carbons BOG and technique peculiar to vessel of liquefying Download PDFInfo
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- CN107620863A CN107620863A CN201710825731.3A CN201710825731A CN107620863A CN 107620863 A CN107620863 A CN 107620863A CN 201710825731 A CN201710825731 A CN 201710825731A CN 107620863 A CN107620863 A CN 107620863A
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Abstract
The invention discloses a kind of liquefaction re-liquefied systems of hydro carbons BOG peculiar to vessel, including occur simultaneously in the re-liquefied circulation loops of goods BOG and refrigerant circulation loop of an ice chest.The re-liquefied circulation loops of goods BOG include liquid goods tank, regenerator, surge tank, re-liquefied side stage compressor to re-liquefied side three-stage blower, re-liquefied side brine cooler, storage tank, intercooler, the first to the 3rd choke valve and balance pipe；Refrigerant circulation loop includes refrigerant side stage compressor, refrigerant side split-compressor, refrigerant side brine cooler and the refrigerant side choke valve being sequentially connected in series by refrigerant line between the export and import of the refrigerant pipe of ice chest.The re-liquefied systems of BOG of the present invention, can not only improve liquefied fraction, shorten the run time of the re-liquefied process systems of whole BOG, moreover it is possible to extend the service intervals of compressor, reduce the space-consuming of equipment, reduce initial cost and operating cost, reach the effect for reducing cost.
Description
Technical field
The present invention relates to a kind of the liquefy re-liquefied systems of hydro carbons BOG and technique peculiar to vessel, ethane, ethene, ethane-ethylene are applicable
The liquid goods such as mixture, ethane-methane (a small amount of), ethene-methane (a small amount of) and ethane-ethylene-methane (a small amount of) mixture.
Background technology
Ethane is the important source material of ethylene source, and ethylene yield is horizontal as a national oil development of chemical industry is weighed
One of important symbol.Under normal pressure, the volume etc. the gaseous ethane of weight is 435 times of the volume of liquefied ethane, therefore in ocean
Ethane transport in, remote way is carried out using low-temperature storage tank and special liquefied gas carrier after generally being liquefied by ethane or with ethene and transported
It is defeated.For liquid goods because storage tank internal-external temperature difference is very big in transportation, external heat, which infilters, can produce BOG in liquid goods tank, caused
BOG must take certain measure to be liquefied, otherwise the Transport Safety of entail dangers to ship.If by caused BOG as
Fuel directly empties, and such processing mode can not only increase BOG generation, and also results in energy waste and economic damage
Lose.In order to avoid this drawback, re-liquefied equipment is equipped with the liquefied goods of transport by sea, caused by during navigation
BOG carries out re-liquefied recovery, to produce good economic benefit.The current re-liquefied re-liquefied rate of system is not high.It is re-liquefied in addition
Compressor in equipment all has the service intervals of a run time, it is contemplated that operation cost is, it is necessary in view of compressor
Run time and maintenance, therefore, the run time of compressor is reduced, so as to extend the service intervals of compressor and be repaired lying up
Time interval, extend the service life of compressor, the investment cost for reducing equipment is the problem of urgently consideration.
The content of the invention
The defects of it is an object of the invention to overcome prior art and a kind of liquefaction re-liquefied systems of hydro carbons BOG peculiar to vessel are provided
And technique, liquefied fraction can not only be improved, shortens the run time of the re-liquefied process units of whole BOG, moreover it is possible to extend compressor
Service intervals, reduce the space-consuming of equipment, reduce initial cost and operating cost, reach the effect for reducing cost.
Realize a kind of technical scheme of the purpose of the present invention：A kind of liquefaction re-liquefied systems of hydro carbons BOG peculiar to vessel, including occur simultaneously in
The re-liquefied circulation loops of goods BOG and refrigerant circulation loop of ice chest；Wherein,
The re-liquefied circulation loops of goods BOG include liquid goods tank, regenerator, surge tank, re-liquefied side stage compressor
To re-liquefied side three-stage blower, re-liquefied side brine cooler, storage tank and intercooler；The gaseous phase outlet of the liquid goods tank
By liquid goods tracheae is evaporated to be connected with the gas feed of the regenerator, the gas vent of the regenerator by pipeline successively with institute
State surge tank, re-liquefied side stage compressor, re-liquefied side split-compressor, re-liquefied side three-stage blower, re-liquefied side sea
Water cooler connects with ice chest；The circulating air outlet of the ice chest is connected with the import of re-liquefied side three-stage blower, described cold
The outlet of case connects the import of the storage tank；The outlet of the storage tank is divided into two-way, all the way by second throttle with it is described in
Between cooler shell side import connection, the import of the spiral coil of another way and intercooler connects, the intercooler
Gaseous phase outlet is connected with the import of the re-liquefied side split-compressor, the outlet of the spiral coil of the intercooler with it is described
The liquid-inlet connection of regenerator, the liquid outlet of the regenerator are connected by the liquid-inlet of the 3rd choke valve and the liquid goods tank
Connect；
The refrigerant circulation loop include be sequentially connected in series the refrigerant pipe of the ice chest export and import it
Between refrigerant side stage compressor, refrigerant side split-compressor, refrigerant side brine cooler and refrigerant side choke valve.
The above-mentioned re-liquefied systems of liquefaction hydro carbons BOG peculiar to vessel and technique, wherein, pressure is set between the ice chest and storage tank
Balance pipe, pressure-equalizing pipe are provided with regulating valve.
Realize purpose of the present invention another technical solution：A kind of liquefaction re-liquefied techniques of hydro carbons BOG peculiar to vessel, are implemented in
State the re-liquefied systems of liquefaction hydro carbons BOG peculiar to vessel of the present invention；
First, the BOG in liquid goods tank enters the surge tank after the regenerator backheat, subsequently enters described re-liquefied
Side stage compressor compression, the exit gas of re-liquefied side stage compressor and the gas phase of the intercooler together enter
Re-liquefied side split-compressor compresses, and the recyclegas in the exit gas and the ice chest of re-liquefied side split-compressor is together
Into the re-liquefied side three-stage blower, BOG is compressed to condensing pressure, the exit gas after re-liquefied side three stage compression enters
Enter to the re-liquefied side brine cooler and carry out preliminary precooling, BOG is cooled to certain temperature, the BOG after precooling enters
Enter the ice chest, first carrying out preliminary condensation turns into saturated liquid, and the BOG of primary liquefaction continues cooling in ice chest there are two kinds of techniques
Route：
The first route：The BOG of primary liquefaction is divided into two strands, wherein one next section of heat exchanger for entering directly into ice chest
It is interior, next section of heat exchanger of ice chest is entered after the throttling of another stock-traders' know-how first throttle valve, decompression, with entering directly into this next section
Fluid in heat exchanger is exchanged heat, and is followed through throttling to be heated to vaporize to enter in re-liquefied side three-stage blower in ice chest
Ring；Be directly entered next section of heat exchanger fluid it is cooled after enter storage tank；
Second of route:The BOG of primary liquefaction is directly all introduced into next section of heat exchanger of ice chest, is exchanged heat in the section
The outlet of device is split into two strands, wherein removing another stock that cooling is diverted after the throttling of a stock-traders' know-how first throttle valve, refrigeration
Fluid, itself heated vaporization, which is returned in re-liquefied side three-stage blower, to be circulated, after another fluid streams are cooled directly
Enter the storage tank；
The fluid come out from the storage tank is divided into two strands, wherein being entered after second throttle decompression described in a stock-traders' know-how described
In the shell side of intercooler, enter with coming out another fluid streams in the spiral coil for entering directly into intercooler from storage tank
Row heat exchange；Fluid in the shell side of intercooler undergoes phase transition after being heated and becomes saturated vapor and enter re-liquefied side two level
Circulated in compressor, the fluid in spiral coil enters after being further cooled into regenerator with BOG caused by liquid goods tank
Row heat exchange, BOG is heated to the temperature of re-liquefied side stage compressor entrance demand, by BOG cooling fluid finally by
3rd choke valve is throttled, is depressured, freezing returns in the liquid goods tank.
The above-mentioned re-liquefied techniques of liquefaction hydro carbons BOG peculiar to vessel, wherein, the spiral coil should all be immersed in the centre
Below liquid level in the housing of cooler.
The re-liquefied systems of liquefaction hydro carbons BOG peculiar to vessel and technique of the present invention has the characteristics that：.
1st, in BOG liquefaction only saturated liquid is subcooled for saturated liquid or slightly in BOG liquefaction by refrigerant, can reduce refrigerant
The power of compressor in loop, reach the effect for reducing energy consumption；
2nd, two circulation loops are included in the re-liquefied circulation loops of goods BOG, for entering one to the liquefaction BOG after preliminary condensation
The cooling of step, circulation loop is carried out in two steps classification heat exchange cooling, so as to reduce the power of BOG split-compressors；
3rd, recovery of the BOG before expenditure and pressure rework solution goods tank is carried out to BOG low temperature colds after liquefying, makes full use of
The lower temperature that not outer plus energy conversion obtains in whole liquefaction cycle, i.e., with low temperature BOG gases caused by liquid goods tank to liquid
The BOG of change carries out heat exchange, avoids waste of the BOG low temperature bit stream bodies of liquid goods tank on cold, this technology arrangement not only can
Reasonable utilization space arrangement, moreover it is possible to BOG liquefied fraction is greatly improved, shortens the run time of the re-liquefied process systems of whole BOG,
Extend the interval time of compressor operating, reach the effect to cut operating costs；
4th, mixed using the gaseous phase outlet of intercooler in pipeline with the outlet line of stage compressor, can letter
Change technology controlling and process；
5th, in refrigerant circulation loop using the cryogen of single component, the problem of in the absence of component proportion, such as running
Leakage occurs in journey to supplement in time, do not interfere with the normal operation of re-liquefied system.
6th, the present invention has simple, easily controllable, equipment the Meteorological of technique and the advantages such as operating cost is low.
Brief description of the drawings
Fig. 1 is the schematic diagram of the re-liquefied systems of liquefaction hydro carbons BOG peculiar to vessel of the present invention；
Fig. 2 a are a kind of schematic diagrams of ice chest in the re-liquefied systems of liquefaction hydro carbons BOG peculiar to vessel of the present invention；
Fig. 2 b are the schematic diagrams of another ice chest in the re-liquefied systems of liquefaction hydro carbons BOG peculiar to vessel of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 to Fig. 2 b, the re-liquefied systems of liquefaction hydro carbons BOG peculiar to vessel of the invention are referred to, especially suitable liquid goods is：Second
Alkane, ethene, ethane-ethene mixtures, ethane-methane (a small amount of), ethene-methane (a small amount of), ethane-ethylene-methane (a small amount of)
Mixture etc..
The liquefaction hydro carbons BOG peculiar to vessel of the present invention it is re-liquefied realize system, including occur simultaneously in ice chest L2 goods BOG liquid again
Change circulation loop and refrigerant circulation loop, wherein：
The re-liquefied circulation loops of goods BOG include liquid goods tank AK, regenerator L1, surge tank D1, re-liquefied side one stage of compression
Machine is to three-stage blower 1C, 2C, 3C, re-liquefied side brine cooler E1, storage tank D2 and intercooler D3；Wherein：Liquid goods tank
AK evaporates tracheae by liquid goods and is connected with regenerator L1 gas feed, regenerator L1 gas vent by pipeline 1~8 according to
It is secondary with surge tank D1, re-liquefied side stage compressor 1C, re-liquefied side split-compressor 2C, re-liquefied side three-stage blower 3C,
Re-liquefied side brine cooler E1 connects with ice chest L2；Ice chest L2 circulating air outlet 13 is with re-liquefied side three-stage blower 3C's
Import connects；Ice chest L2 outlet 9 connects storage tank D2 import by pipeline 12；Storage tank D2 outlet 14 is divided into two-way pipeline 15
With 16, pipeline 16 is connected by second throttle V2 with intercooler D3 shell side import all the way, and another way pipeline 15 is with
Between cooler D3 spiral coil import connection, intercooler D3 gaseous phase outlet 18 and re-liquefied side split-compressor 2C
Import connection, intercooler D3 spiral coil outlet 19 is connected with regenerator L1 liquid-inlet, regenerator L1 liquid
Body outlet 20 is connected with the 3rd choke valve V3 import, and the 3rd choke valve V3 outlet passes through recharge liquefaction pipe RL and liquid goods tank AK
Liquid-inlet connection；
Pressure-equalizing pipe P1 is also set up between ice chest L2 and storage tank D2, pressure-equalizing pipe P1 is provided with a regulating valve V5, uses
Pressure in adjustment ice chest L2 and storage tank D2, to ensure that the liquid in ice chest L2 smoothly flows into storage tank D2；
Refrigerant circulation loop is sequentially connected in series in the outlet of ice chest L2 refrigerant pipe by refrigerant line 21~25
Refrigerant side stage compressor 4C, refrigerant side split-compressor 5C, refrigerant side brine cooler E2 between import and
Refrigerant side choke valve V4.Cryogen is by refrigerant side stage compressor 4C and refrigerant side split-compressor 5C by gaseous state cryogen
Condensing pressure is compressed to, cooling liquid is then carried out by refrigerant side brine cooler E2, then pass through refrigerant side choke valve
V4 progress throttling refrigerations, which return to, carries out BOG in ice chest L2 preliminary liquefaction.
The re-liquefied techniques of liquefaction hydro carbons BOG peculiar to vessel of the present invention, are implemented in the liquefaction hydro carbons BOG peculiar to vessel of the invention described above again
Liquefaction system, the present embodiment illustrate by taking liquefied ethane as an example.
When just having started liquefaction step, because overall circulation has not been completed in whole liquefaction system, so starting liquefaction firm
The ethane gas (EG) come out during system from liquid goods tank AK gaseous phase outlet enter buffering in regenerator L1 without heat exchange
In tank D1, subsequently enter re-liquefied side stage compressor 1C and be compressed, re-liquefied side stage compressor 1C exit gas with
The gas of intercooler D3 gaseous phase outlet is compressed into re-liquefied side split-compressor 2C together, re-liquefied side two level
Compressor 2C exit gas is compressed together with the recyclegas in ice chest L2 into re-liquefied side three-stage blower 3C, then
After EG is compressed to condensing pressure by liquefaction side three-stage blower 3C, preliminary precooling is carried out into re-liquefied side brine cooler E1,
Ethane temperature after precooling is 35 DEG C, the EG for exporting out from re-liquefied side brine cooler E1 enter in ice chest L2 with refrigeration
Agent circulation loop first carries out preliminary condensing heat-exchange, realizes EG primary liquefaction.
LEG after primary liquefaction continues cooling in ice chest L2 two kinds of process routes, and the first route is as shown in Figure 2 a：
The LEG of primary liquefaction is divided into two strands, and wherein one LEG is entered directly into ice chest L2 next section of heat exchanger, another strand of LEG warp
Enter after first throttle valve V1 throttlings, decompression in ice chest L2 next section of heat exchanger, for cooling down another gang of LEG, after throttling
Vaporization is heated to be circulated into re-liquefied side three-stage blower 3C；Second of route is as shown in Figure 2 b:The LEG of primary liquefaction
In next section of heat exchanger for all entering directly into ice chest L2, two gangs of LEG are split into the outlet of this section of heat exchanger, wherein one
Stock LEG removes another gang of LEG that cooling is diverted after first throttle valve V1 throttlings, refrigeration, and itself is heated vaporization and returned to
Circulated in re-liquefied side three-stage blower 3C, storage tank D2 is entered directly into after another gang of LEG is cooled；Ice chest L2 and storage tank
Pressure-equalizing pipe P1 is additionally provided between D2, pressure-equalizing pipe P1 is provided with regulating valve V5, for balancing ice chest L2 and storage tank D2
Interior pressure, it is ensured that the LEG in ice chest L2 smoothly flows into storage tank D2；Storage tank D2 LEG exports is divided into two strands by pipeline
During LEG in LEG inflow lines 15,16, wherein inflow line 16 is entered after second throttle V2 decompressions by pipeline 17
Between cooler D3 shell side in LEG in spiral coil with entering directly into intercooler D3 by pipeline 15 changed
Heat, the spiral coil should be all immersed in below the liquid level of intercooler D3 shell sides, make the LEG in spiral coil further
Cool down, the saturated vapor that the LEG in intercooler D3 shell sides is undergone phase transition after being heated enters re-liquefied side two-stage compression
Machine 2C is circulated, and entering the EG that regenerator L1 and liquid goods tank AK comes out after the LEG in spiral coil is cooled is exchanged heat,
BOG is heated to the temperature of re-liquefied side stage compressor 1C entrance demands, and LEG is further cooled down by BOG in regenerator L1,
Throttled, be depressured finally by the 3rd choke valve V3, freeze after by recharge liquefy pipe RL return in liquid goods tank AK.
Above example is used for illustrative purposes only, rather than limitation of the present invention, the technology people about technical field
Member, without departing from the spirit and scope of the present invention, can also make various conversion or modification, therefore all equivalent
Technical scheme should also belong to scope of the invention, should be limited by each claim.
Claims (4)
1. a kind of liquefaction re-liquefied systems of hydro carbons BOG peculiar to vessel, including occur simultaneously in the re-liquefied circulation loops of goods BOG and system of ice chest
Refrigerant cycle loop；Characterized in that,
The re-liquefied circulation loops of goods BOG include liquid goods tank, regenerator, surge tank, re-liquefied side stage compressor to again
Liquefy side three-stage blower, re-liquefied side brine cooler, storage tank and intercooler；The gaseous phase outlet of the liquid goods tank passes through
Liquid goods evaporation tracheae is connected with the gas feed of the regenerator, and the gas vent of the regenerator is delayed with described successively by pipeline
It is cold to rush tank, re-liquefied side stage compressor, re-liquefied side split-compressor, re-liquefied side three-stage blower, re-liquefied side seawater
But device connects with ice chest；The circulating air outlet of the ice chest is connected with the import of re-liquefied side three-stage blower, the ice chest
Outlet connects the import of the storage tank；The outlet of the storage tank is divided into two-way, cold by second throttle and the centre all the way
But the import of the spiral coil of the shell side import connection of device, another way and intercooler connects, the gas phase of the intercooler
Outlet is connected with the import of the re-liquefied side split-compressor, the outlet of the spiral coil of the intercooler and the backheat
The liquid-inlet connection of device, the liquid outlet of the regenerator are connected by the 3rd choke valve with the liquid-inlet of the liquid goods tank；
The refrigerant circulation loop includes being sequentially connected in series between the export and import of the refrigerant pipe of the ice chest
Refrigerant side stage compressor, refrigerant side split-compressor, refrigerant side brine cooler and refrigerant side choke valve.
2. the re-liquefied systems of hydro carbons BOG and the technique peculiar to vessel of liquefying according to claim 1, it is characterised in that the ice chest
Pressure-equalizing pipe is set between storage tank, and pressure-equalizing pipe is provided with regulating valve.
3. a kind of liquefaction re-liquefied techniques of hydro carbons BOG peculiar to vessel, liquefaction C2 hydro carbons BOG peculiar to vessel described in claim 1 is implemented in again
Liquefaction system, it is characterised in that
First, the BOG in liquid goods tank enters the surge tank after the regenerator backheat, subsequently enters the re-liquefied side one
Level compressor compresses, the exit gas of re-liquefied side stage compressor and the gas phase of the intercooler together enter liquid again
Change the compression of side split-compressor, exit gas and the recyclegas in the ice chest of re-liquefied side split-compressor together enter
The re-liquefied side three-stage blower, BOG is compressed to condensing pressure, the exit gas after re-liquefied side three stage compression enters
The re-liquefied side brine cooler carries out preliminary precooling, BOG is cooled to certain temperature, the BOG after precooling enters institute
Ice chest is stated, first carrying out preliminary condensation turns into saturated liquid, and the BOG of primary liquefaction continues cooling in ice chest there are two kinds of technique roads
Line：
The first route：The BOG of primary liquefaction is divided into two strands, and wherein one is entered directly into next section of heat exchanger of ice chest,
Enter next section of heat exchanger of ice chest after another stock-traders' know-how first throttle valve throttling, decompression, with entering directly into this next section heat exchange
Fluid in device is exchanged heat, and is circulated through throttling to be heated to vaporize to enter in re-liquefied side three-stage blower in ice chest；
Be directly entered next section of heat exchanger fluid it is cooled after enter storage tank；
Second of route:The BOG of primary liquefaction is directly all introduced into next section of heat exchanger of ice chest, in this section of heat exchanger
Outlet is split into two strands, wherein another fluid streams that cooling is diverted are gone after stock-traders' know-how first throttle valve throttling, refrigeration, from
The heated vaporization of body, which is returned in re-liquefied side three-stage blower, to be circulated, and storage is entered directly into after another fluid streams are cooled
Tank；
The fluid come out from the storage tank is divided into two strands, wherein entering cooling during rolling after second throttle decompression described in a stock-traders' know-how
In the shell side of device, exchanged heat with coming out another fluid streams in the spiral coil for entering directly into intercooler from storage tank；
Fluid in intercooler shell side undergoes phase transition after being heated and becomes saturated vapor and enter the re-liquefied side two-stage compression
Circulated in machine, the fluid in spiral coil is changed after being further cooled into regenerator with BOG caused by liquid goods tank
Heat, BOG is set to be heated to the temperature of re-liquefied side stage compressor entrance demand, by the fluid of BOG coolings finally by the 3rd
Choke valve is throttled, is depressured, freezing returns in liquid goods tank.
4. the liquefaction re-liquefied techniques of hydro carbons BOG peculiar to vessel according to claim 3, it is characterised in that the spiral coil should
All it is immersed in below the liquid level in the housing of the intercooler.
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| CN201710825731.3A CN107620863B (en) | 2017-09-14 | 2017-09-14 | The re-liquefied system of one kind liquefaction hydro carbons BOG peculiar to vessel and technique |
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| CN201710825731.3A CN107620863B (en) | 2017-09-14 | 2017-09-14 | The re-liquefied system of one kind liquefaction hydro carbons BOG peculiar to vessel and technique |
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| CN108518581A (en) * | 2018-06-06 | 2018-09-11 | 张家港艾普能源装备有限公司 | LNG storage tank BOG recovery systems |
| CN112696242A (en) * | 2020-11-30 | 2021-04-23 | 合肥通用机械研究院有限公司 | A reposition of redundant personnel regulation and control system for supercritical carbon dioxide recompression circulation |
| CN113734352A (en) * | 2021-09-24 | 2021-12-03 | 上海外高桥造船有限公司 | Gas supply system with re-condensation function and working method |
| NO20211391A1 (en) * | 2021-11-19 | 2023-05-22 | Econnect Energy As | System and method for cooling of a liquefied gas product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112696242B (en) * | 2020-11-30 | 2023-02-28 | 合肥通用机械研究院有限公司 | A reposition of redundant personnel regulation and control system for supercritical carbon dioxide recompression circulation |
| CN113734352A (en) * | 2021-09-24 | 2021-12-03 | 上海外高桥造船有限公司 | Gas supply system with re-condensation function and working method |
| NO20211391A1 (en) * | 2021-11-19 | 2023-05-22 | Econnect Energy As | System and method for cooling of a liquefied gas product |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107620863B (en) | 2019-06-25 |
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