CN104482396B - BOG recovery system with cold storage function - Google Patents
BOG recovery system with cold storage function Download PDFInfo
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- CN104482396B CN104482396B CN201410630999.8A CN201410630999A CN104482396B CN 104482396 B CN104482396 B CN 104482396B CN 201410630999 A CN201410630999 A CN 201410630999A CN 104482396 B CN104482396 B CN 104482396B
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- 238000003860 storage Methods 0.000 title claims abstract description 162
- 238000011084 recovery Methods 0.000 title claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 181
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 90
- 238000000034 method Methods 0.000 claims abstract description 39
- 230000005494 condensation Effects 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 42
- 238000004064 recycling Methods 0.000 claims description 34
- 238000001816 cooling Methods 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000011896 sensitive detection Methods 0.000 claims 2
- 230000006698 induction Effects 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000003949 liquefied natural gas Substances 0.000 description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 208000036626 Mental retardation Diseases 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007907 direct compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a novel BOG recovery process with high efficiency, low energy consumption and cold storage function and a device thereof, comprising an LNG storage tank, a nitrogen storage tank, a compressor, a first cold storage tank, an expander, a BOG condensation recovery device and a second cold storage tank. The process flow is simple, professional equipment is reduced, automatic control can be realized, the nitrogen can be recycled, the waste of nitrogen evacuation is reduced, the investment of capital is greatly reduced, and the method has good industrial popularization and market application prospects.
Description
Technical field
Patent of the present invention is related to the technical field such as lng (liquefied natural gas) accumulating and use, is the new of commercial recovery bog
Efficient device.
Background technology
China's natural gas resource reserve enriches, and demand growth is increasingly accelerated.Compared with gasoline, diesel oil, lng as automobile,
Ship power fuel, has good safe and environment-friendly, economic dispatch advantage, is not only the emphasis propulsion of China's sea energy-saving and emission-reduction
One of project (Ministry of Communications " " 12 " water transport energy-saving and emission-reduction totally advance embodiment ") is also central authorities and the Committee of Development and Reform supports
Emphasis strong industry (" the 12nd five-year-plan outline of People's Republic of China's national economy and social development ", " national development
Reform committee is with regard to accelerating the instruction of propulsion gas storage Facilities Construction ").The main component of lng is methane, is at normal temperatures and pressures
Existing gaseous state, but during accumulating and selling use, need to be by natural gas gaseous under normal temperature and pressure in 0.1mpa, liquid at -163 DEG C
Change the storage tank being stored in lng.Due to the reason such as external heat invasion and attack and some leakage heat, the lng in storage tank will be made again to gasify, produce
Raw substantial amounts of bog (boil off gas) gas, these gases will make the pressure in storage tank raise rapidly, not only can be to storage tank
Structure damages, and causes danger also to the safe operation of system, is the serious restriction that lng project is quickly pushed ahead.If
These gases are emptied, not only causes the wasting of resources, and easily cause blast, bring potential safety hazard, and waste gas discharge is drawn
Rise haze, acid rain and greenhouse effect also very important it is therefore necessary to be reclaimed.If reclaiming to this portion gas,
Then economic benefit is very considerable.
Bog recovery technology common at present mainly has the direct compression process of bog and bog condensation liquefaction technique again.Directly press
Contracting method is that directly after compressor compression, bog gas is improved its pressure, then passes through the outer defeated supply other equipment of pipe network and uses,
Although this technique flow process is simple, power consumption is larger, and it is also higher to build the cost of pipe network；Bog condensation liquefaction technique again,
It is through knockout drum detached bog, certain pressure will to be forced into by compressor, phase is transferred out by the first order pump in storage tank
With the lng of pressure, because pressure after pump pressurization for the lng is more than the saturation pressure of lng at a temperature of this, there is certain " aobvious cold "
Property, after-condenser is provided with ratio control system, and the flow-control according to bog enters the lng flow of after-condenser, and both are cold again
Direct contact heat transfer in condenser, most of bog is condensed by " aobvious cold " using lng.In both technique, bog compressor is
The key equipment of bog Gas recovery, the normal safe being related to main equipment lng storage tank runs.Typically adopt low at present
Warm oilless reciprocating compressor, domestic Compressor Manufacturing factory there is no design, manufactures the mature experience of such oil-free reciprocating compressor,
Rely primarily on import, and the data of the statistical technique data of bog compressor fault analysis aspect and operational reliability aspect
It is not very perfect.
Content of the invention
In order to overcome the shortcomings of prior art and defect, it is an object of the invention to provide a kind of flow process is simple, the energy is sharp
With rate height, high efficiency, low cost, there is the technological process that the bog of cold storage function reclaims.The method is not required in bog removal process
Bog compressor and some large-scale machineries, make the enough mental retardation of the temperature of nitrogen and bog gas using common compressor and decompressor
Body heat exchange makes it liquefy.Nitrogen can recycle, and again in whole technique plus the application of cold storage tank, the method can be significantly
Save energy and equipment operating cost, and principle is simple, compact conformation, energy-conserving and environment-protective, can be widely used in various bog
The occasion reclaiming.
The purpose of the present invention is to be achieved through the following technical solutions:
A kind of new and effective bog recovery system with cold storage function, including nitrogen storage tank, piezometer, effusion meter, general
Port valve door, double-screw compressor, a cold storage tank, 9 autocontrol valves, turbine expanded radially machine, dress is reclaimed in bog condensation
Put, lng storage tank, No. two cold storage tanks, temperature inductor, pressure inductor and automatic control system.The outlet of nitrogen storage tank with
The entrance of double-screw compressor passes through pipeline and is connected, and has effusion meter and common valve above pipeline；The going out of double-screw compressor
Mouth bifurcates, and a first entrance with a cold storage tank is connected, and a second entrance with No. two cold storage tanks is connected, this two
Pipeline have all using utilidor and above autocontrol valve；The first outlet of a number cold storage tank bifurcates, one
Be connected with decompressor, a second outlet with No. two cold storage tanks is connected, this two pipeline all using utilidor and on
Face has autocontrol valve；The outlet of decompressor is connected with the channel of nitrogen entrance of bog condensate recycling device, and pipeline is using guarantor
Warm pipeline；The outlet of the channel of nitrogen of bog condensate recycling device bifurcates, and a second entrance with a cold storage tank is connected,
One first entrance with No. two cold storage tanks is connected, and this two pipeline has all using utilidor and above and automatically controls
Valve；The first outlet of No. two cold storage tanks bifurcates, and a second outlet with a cold storage tank is connected, one and nitrogen storage tank
Entrance be connected, this two pipeline is all using utilidor and above with autocontrol valve；The outlet of lng storage tank with
The entrance of the bog gas passage of bog condensate recycling device passes through pipeline and is connected, and pipeline adopts utilidor and has above certainly
Dynamic control valve；The outlet of the bog gas passage of bog condensate recycling device is connected by pipeline with the entrance of lng storage tank, pipeline
Using utilidor.
The bog recovery method of the present invention, the nitrogen coming from nitrogen storage tank is compressed through double-screw compressor, after compression
Nitrogen enters expander after flowing through a cold storage tank (before having stored up cold in the pre-cooling preparatory stage) cooling, and temperature drops further
After low, entrance bog condensate recycling device carries out heat exchange with bog gas makes it liquefy, and the nitrogen that then temperature has raised flows through two
Number cold storage tank, temperature enters nitrogen storage tank after raising, and returning the process cycle before the nitrogen in nitrogen storage tank repeats makes
With.
Above-mentioned bog recovery process flow process mainly includes two stages, is respectively:
First, prepare the pre-cooling stage: be respectively arranged with temperature inductor above two cold storage tanks, prepare pre-cooling when just starting, now
It is not passed through bog gas, only nitrogen flows operation in whole process unit, when No. two cold storage tanks in bog condensate recycling device
Temperature when being less than -130 DEG C, the open and close of automatic control system autocontrol valve, realize the switching of two storage tanks and use,
I.e. when the temperature of No. two cold storage tanks is less than -130 DEG C, the open and close of automatic control system control valve make No. two storage tanks
To be connected with the outlet of double-screw compressor, when now nitrogen flows through, temperature reduces, thus decreasing the wasted work of decompressor.
2nd, processing stage operation: when No. two cold storage tank temperature are less than -130 DEG C, now whole technological process just can be opened
Begin to carry out processing bog gas, automatic control system controls the unlatching release bog gas of lng storage-tank pipeline upper valve to be passed through
Bog condensate recycling device and low temperature nitrogen heat exchange, return lng storage tank by after bog gas liquefaction.In running, as long as
The open and close of automatic control system autocontrol valve when the temperature having a cold storage tank is less than -130 DEG C, realize two storages
Tank switching uses, and repeats this process, nitrogen circulation can be made to utilize, decrease the waste of nitrogen purge, greatly reduce fund
Input and the energy loss.
Beneficial effect: the recovery process of common bog on contrast market, this technological process is simple, decreases some specialties
The use of equipment such as bog compressor, whole technological process apparatus are less, are capable of automatically controlling, can make nitrogen circulation
Using, decrease the waste of nitrogen purge, greatly reduce the input of fund, have good commercial introduction and market application before
Scape.
Brief description
Fig. 1 is the equipment flowsheet of the present invention new and effective bog recovery system.
Fig. 2 is the pipeline import and export mix schematic diagram of cold storage tank of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing and example, the enforcement of the present invention is described further, but the enforcement of the present invention and protection do not limit
In this.
The present embodiment is described in detail a kind of new and effective, low energy consumption and has the recovery process of the bog of cold storage function
And its device.This bog recovery system obtains compressed nitrogen after compressing the nitrogen coming from nitrogen storage tank, passes through cold storage tank
(having stored up cold in the pre-cooling preparatory stage) cools down before, and temperature enters expander after reducing, and temperature enters after reducing further
Bog condensate recycling device and bog gas carry out heat exchange makes it liquefy, and then flows through another cold storage tank, and temperature is last after raising
Enter nitrogen storage tank.
As shown in figure 1, the bog recovery system of the present embodiment includes nitrogen storage tank 1, common valve 2, double-screw compressor 3,
First control valve 4, the second control valve 5, a cold storage tank 6, the 3rd control valve 7, the 4th control valve 8, decompressor 9,
Bog condensate recycling device 10, the 5th control valve 11, the 6th control valve 12, No. two cold storage tanks 13, the 7th control valve 14,
8th control valve 15, lng storage tank 16, the 9th control valve 17.It is respectively arranged with pressure detecting on nitrogen storage tank 1 and lng storage tank 16
Device, a cold storage tank 6 and No. two cold storage tanks 13 are respectively arranged with temperature sensing device.
The described outlet of nitrogen storage tank 1 is connected by pipeline with the entrance of double-screw compressor 3, has stream above pipeline
Gauge and common valve；The outlet of double-screw compressor 3 bifurcates, and a first entrance with a cold storage tank 6 is connected, one
It is connected with the second entrance of No. two cold storage tanks 13, this two pipeline is all using utilidor and above with autocontrol valve
Door；The first outlet of a number cold storage tank 6 bifurcates, and one is connected with decompressor 9, a second outlet with No. two cold storage tanks 13
It is connected, this two pipeline is all using utilidor and above with autocontrol valve；The outlet of decompressor 9 is cold with bog
The channel of nitrogen entrance of solidifying retracting device 10 is connected, and pipeline adopts utilidor；The channel of nitrogen of bog condensate recycling device 10
Outlet bifurcates, and a second entrance with a cold storage tank 6 is connected, and a first entrance with No. two cold storage tanks 13 is connected,
This two pipeline is all using utilidor and above with autocontrol valve；The first outlet of No. two cold storage tanks 13 divides two
, a second outlet with a cold storage tank 6 is connected, and an entrance with nitrogen storage tank 1 is connected, and this two pipeline is all adopted
With utilidor and above with autocontrol valve；The outlet of lng storage tank 16 and the bog gas of bog condensate recycling device 10
The entrance of body passage passes through pipeline and is connected, and pipeline adopts utilidor and has autocontrol valve above；Bog condensation is reclaimed
The outlet of the bog gas passage of device 10 is connected by pipeline with the entrance of lng storage tank 16, and pipeline adopts utilidor.
Using above-mentioned bog recovery process flow process, comprise the following steps:
1st, prepare the pre-cooling stage, be not now also passed through bog gas in bog condensate recycling device 10.No. two cold storage tanks 13
Temperature be not below -130 DEG C, the sensing of temperature inductor above No. two cold storage tanks 13 transmission signal, automatic control system
The first control valve 4, the 3rd control valve 7, the 5th control valve 11, the 7th control valve 14 is controlled to open, the 8th control valve
Door the 15, the 6th control valve 12, the 4th control valve 8, the second control valve 5 are closed, and open common valve 2；Normal temperature and pressure
Nitrogen is exported by nitrogen storage tank 1, enters double-screw compressor 3 and is compressed；
2nd, it is cold from a first entrance number storage of entrance of a cold storage tank 6 that the compressed nitrogen obtaining flows through the first control valve 4
Tank 6, passes through the 3rd control valve 7 and flows out from the first outlet of a cold storage tank 6, pressure is basically unchanged；
3rd, the nitrogen flowing out from a cold storage tank 6 is expanded by decompressor 9, reduced pressure, and temperature also reduces further；
4th, low temperature nitrogen enters bog condensate recycling device 10, because now no bog gas enters and nitrogen heat exchange,
Nitrogen directly exports from bog condensate recycling device 10 channel of nitrogen and flows out；
5th, from bog condensate recycling device 10, nitrogen out flows through the 5th control valve 11 from the first of No. two cold storage tanks 13
Entrance enters No. two cold storage tanks 13, passes through the 7th control valve 14 and flows out from the first outlet of No. two cold storage tanks 13, pressure base
This is constant, finally enters nitrogen storage tank 1；
6th, such nitrogen circulation is run until the temperature of No. two cold storage tanks 13 is less than -130 DEG C, and temperature inductor senses and passes
Defeated signal, automatic control system automatically controls the 8th control valve 15, the 6th control valve 12, the 4th control valve the 8, second control
Valve 5 processed is opened, and the first control valve 4, the 3rd control valve 7, the 5th control valve 11, the 7th control valve 14 are closed, nitrogen
Gas is exported by nitrogen storage tank 1, enters double-screw compressor 3, and now automatic control system controls the 9th control valve 17 to open lng
Storage tank 16 discharges bog gas, and bog gas enters bog condensate recycling device 10, and disposed of in its entirety technique brings into operation；
7th, the compressed nitrogen obtaining flows through the 8th control valve 15 and enters No. two storages from the second entrance of No. two cold storage tanks 13
Cold tank 13, passes through the 6th control valve 12 and flows out from the second outlet of No. two cold storage tanks 13, temperature reduces, and pressure is substantially not
Become；
8th, the low temperature nitrogen flowing out from No. two cold storage tanks 13 is expanded by decompressor 9, reduced pressure, and temperature also drops further
Low；
9th, low temperature nitrogen enters bog condensate recycling device 10, and carrying out heat exchange with bog gas makes it liquefy, the bog after liquefaction
Gas out flows back to lng storage tank 16 from bog condensate recycling device 10；
10th, from bog condensate recycling device 10, nitrogen out flows through the 4th control valve 8 from the second of a cold storage tank 6
Entrance enters a cold storage tank 6, passes through the second control valve 5 and flows out from the second outlet of a cold storage tank 6, temperature is boosted
Power is basically unchanged；Finally enter nitrogen storage tank 1；
11st, the recovery that said method continuously carries out bog gas is installed.
The technical scheme of embodiment described above, all can only be considered that the description of the invention can not limit the present invention,
Claims indicate protection scope of the present invention, and any in claims of the present invention suitable implication and scope changes
Become, broadly fall in the range of claims of the present invention, all should receive respect and protect.
Claims (9)
1. a kind of bog recovery system with cold storage function, including lng storage tank it is characterised in that: also include nitrogen storage tank, pressure
Contracting machine, cold storage tank, decompressor, bog condensate recycling device, No. two cold storage tanks, will come from the nitrogen of nitrogen storage tank through pressure
Contracting machine compresses, and the nitrogen after compression enters expander after flowing through a cold storage tank cooling, and temperature enters after reducing further
Bog condensate recycling device and bog gas carry out heat exchange makes it liquefy, and then flows through No. two cold storage tanks, and temperature raises, and finally enters
Nitrogen storage tank, the process cycle before the nitrogen in nitrogen storage tank repeats uses；
System also includes automatic control system, and described lng storage tank is provided with pressure sensitive detection means, described pressure sensitive detection
Device detects pressure signal, and when pressure reaches dangerous pressure, whole system automatic running, when one of cold storage tank temperature
Reach and during requirement, automatically turn on valve release bog gas, whole bog recovery process is started working；Described cold storage tank is provided with temperature
Degree induction apparatuss, described temperature inductor receives transmission signal, the autocontrol valve when arbitrary cold storage tank temperature is less than -130 DEG C
Open and close, and then realize the switching of two cold storage tanks and use.
2. bog recovery system according to claim 1 it is characterised in that: described compressor be double-screw compressor, described
Decompressor is turbine expanded radially machine, and described bog condensate recycling device is microchannel around heat exchange of heat pipe；The going out of described nitrogen storage tank
Mouth is connected by pipeline with the entrance of described double-screw compressor, has effusion meter and common valve above pipeline；Described pair of spiral shell
The outlet of bar compressor bifurcates, and a first entrance with a cold storage tank is connected, and one enters with the second of No. two cold storage tanks
Mouth is connected, and this two pipeline is all using utilidor and above with autocontrol valve；The of a described cold storage tank
One outlet bifurcates, and one is connected with described decompressor, and a second outlet with No. two cold storage tanks is connected, this two pipeline
All using utilidor and above with autocontrol valve；The outlet of described decompressor and described bog condensate recycling device
Channel of nitrogen entrance be connected, pipeline adopts utilidor；The outlet of the channel of nitrogen of described bog condensate recycling device divides two
, a second entrance with a described cold storage tank is connected, and a first entrance with described No. two cold storage tanks is connected, and this two
The pipeline propping up is all using utilidor and above with autocontrol valve；The first outlet of described No. two cold storage tanks divides two
, a second outlet with a described cold storage tank is connected, and an entrance with described nitrogen storage tank is connected, this two pipe
Road is all using utilidor and above with autocontrol valve；The outlet of described lng storage tank reclaims dress with described bog condensation
The entrance of the bog gas passage put passes through pipeline and is connected, and pipeline adopts utilidor and has autocontrol valve above；Institute
The outlet stating the bog gas passage of bog condensate recycling device is connected by pipeline with the entrance of described lng storage tank, and pipeline adopts
Utilidor.
3. bog recovery system according to claim 1 it is characterised in that: described cold storage tank is with double-deck tank of heat-insulation layer
Body, the specific cobblestone of size such as is full of inside tank body, the outlet temperature of cold storage tank determines according to the size of yield.
4. the bog recovery system according to one of claims 1 to 3 it is characterised in that: each device and each equipment
Adapter, valve all carry out isothermal holding.
5. a kind of bog recovery method with cold storage function, builds the bog described in one of Claims 1-4 first and reclaims system
System it is characterised in that: described bog recovery method includes two stages, is respectively:
Prepare the pre-cooling stage: be respectively arranged with temperature inductor above two cold storage tanks, prepare pre-cooling when just starting, now bog condensation
It is not passed through bog gas, only nitrogen flows operation in bog recovery system, only when the temperature of No. two cold storage tanks in retracting device
When degree is less than design temperature, the open and close of automatic control system ability control valve make No. two cold storage tanks compress with twin screw
The outlet of machine is connected, and realizes two cold storage tank switchings and uses；
Processing stage operation: when No. two cold storage tank temperature are less than design temperature, now bog recovery system proceeds by process
Bog gas, automatic control system controls the unlatching release bog gas of lng storage-tank pipeline upper valve to be passed through bog condensation recovery dress
Put and low temperature nitrogen heat exchange, return lng storage tank by after bog gas liquefaction.
6. bog recovery method according to claim 5 it is characterised in that: in running, design temperature be -130
DEG C, as long as the temperature having a cold storage tank is less than -130 DEG C, the open and close of automatic control system autocontrol valve, real
Existing two cold storage tanks switching uses, and repeats this process, so that nitrogen circulation is utilized.
7. bog recovery method according to claim 5 it is characterised in that: the nitrogen coming from nitrogen storage tank is through twin screw
Compressor compresses, the nitrogen after compression enters expander after flowing through a cold storage tank cooling, and temperature reduces laggard further
Entering bog condensate recycling device and carrying out heat exchange with bog gas makes it liquefy, and it is cold that the nitrogen that then temperature has raised flows through No. two storages
Tank, temperature enters nitrogen storage tank after raising, and returns the process cycle before the nitrogen in nitrogen storage tank repeats and uses.
8. the bog recovery method according to one of claim 5 to 7 it is characterised in that:
Step one, prepare the pre-cooling stage, be not now also passed through bog gas, the temperature of No. two cold storage tanks in bog condensate recycling device
Degree is not below -130 DEG C, the temperature inductor sensing simultaneously transmission signal above No. two cold storage tanks, and automatic control system controls phase
The control valve answered is opened, and controls corresponding control valve to close；The nitrogen of normal temperature and pressure is exported by nitrogen storage tank, enters double spiral shells
Bar compressor is compressed；
Step 2, the compressed nitrogen obtaining flow through control valve and enter a cold storage tank from the first entrance of a cold storage tank, then
Flow out from the first outlet of a cold storage tank, pressure is basically unchanged；
Step 3, the nitrogen flowing out from a cold storage tank pass through expander, reduced pressure, and temperature reduces further；
Step 4, low temperature nitrogen enter bog condensate recycling device, and when therefore, no bog gas enters and nitrogen heat exchange, so nitrogen
Directly export from bog condensate recycling device channel of nitrogen and flow out；
Step 5, from bog condensate recycling device, nitrogen out flows through control valve and enters from the first entrance of No. two cold storage tanks
No. two cold storage tanks, then flow out from the first outlet of No. two cold storage tanks, pressure is basically unchanged, and finally enters nitrogen storage tank；
Step 6, such nitrogen circulation are run until the temperature of No. two cold storage tanks is less than -130 DEG C, and temperature inductor senses and passes
Defeated signal, automatic control system controls corresponding control valve to open, and controls corresponding control valve to close, nitrogen is by nitrogen storage
Tank exports, and enters double-screw compressor, and lng storage tank release bog gas is opened in now automatic control system control, and bog gas enters
Enter bog condensate recycling device, disposed of in its entirety technique brings into operation；
Step 7, the compressed nitrogen obtaining flow through control valve and enter No. two cold storage tanks from the second entrance of No. two cold storage tanks, then
Flow out from the second outlet of No. two cold storage tanks, temperature reduces, pressure is basically unchanged；
Step 8, the low temperature nitrogen flowing out from No. two cold storage tanks pass through expander, reduced pressure, and temperature reduces further；
Step 9, low temperature nitrogen enter bog condensate recycling device, and carrying out heat exchange with bog gas makes it liquefy, the bog after liquefaction
Gas out flows back to lng storage tank from bog condensate recycling device；
Step 10, enter a cold storage tank from bog condensate recycling device nitrogen out from the second entrance of a cold storage tank, then
The second outlet flowing through a cold storage tank flows out, and temperature rises, and pressure is basically unchanged；Finally enter nitrogen storage tank.
9. bog recovery method according to claim 8 it is characterised in that: methods described continuously carries out bog gas
Recovery.
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| CN105864636B (en) * | 2016-05-23 | 2018-11-06 | 唐山市新概念科技有限公司 | LNG filling stations unload without pump, fill, charging system and fill technique |
| CN108036194A (en) * | 2017-10-20 | 2018-05-15 | 中海浙江宁波液化天然气有限公司 | Precooling technique before low pressure LNG manifold for the second stage of tank car system fills |
| CN111156418B (en) * | 2018-11-08 | 2022-04-08 | 中国石油化工股份有限公司 | Recovery system for liquefied hydrocarbons |
| CN109646984A (en) * | 2019-01-17 | 2019-04-19 | 南京工业大学 | VOCs multistage cooling recovery system with cold storage function |
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| JP2001248797A (en) * | 2000-03-02 | 2001-09-14 | Tokyo Gas Co Ltd | Reliquefying device for boil-off gas generated in lpg storing tank |
| CN202371968U (en) * | 2011-12-02 | 2012-08-08 | 中国海洋石油总公司 | Boil-off gas liquefaction recovery device for liquefied natural gas receiving station |
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| CN103775820A (en) * | 2014-01-26 | 2014-05-07 | 南京工业大学 | Novel ultrahigh pressure compressed air coil pipe gas storage device with heat storage function |
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