CN104879649B - Method for transferring tank by using LNG low-pressure external pipeline - Google Patents
Method for transferring tank by using LNG low-pressure external pipeline Download PDFInfo
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- CN104879649B CN104879649B CN201510240743.0A CN201510240743A CN104879649B CN 104879649 B CN104879649 B CN 104879649B CN 201510240743 A CN201510240743 A CN 201510240743A CN 104879649 B CN104879649 B CN 104879649B
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- lng
- low
- low pressure
- operated valve
- valve
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007599 discharging Methods 0.000 claims description 29
- 238000010992 reflux Methods 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000004904 shortening Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a method for transferring a tank by using an LNG low-pressure outward pipeline, which comprises the following steps: 1) before the LNG tank is inverted, the pneumatic valve interlock of the outlet of the low-pressure pump is released; 2) opening a pneumatic valve on an outlet pipeline of the low-pressure pump; 3) the control valve on the minimum return line of the low-pressure pump is used for regulating the pouring flow. The method of the invention can reduce the generation of BOG of the LNG receiving station, improve the tank-dumping efficiency, and simultaneously improve the controllability and the like by shortening the distance and utilizing the minimum return line of the low-pressure pump to perform the tank-dumping operation.
Description
Technical field
The present invention relates to a kind of method that the LNG of utilization low pressure external transport pipeline carries out tank switching.
Background technology
LNG just applies in large scale investment market as a kind of clean energy resource, and LNG typically uses low temperature resistant
Containers store, because of the absorption of outside energy during storing, or the new LNG density injected is different,
LNG in storage tank is likely to occur layering, after layering occurs, if not taking mixed liquid or tank switching measure, and may
Rolling occurs, affects storage tank and operations staff's safety.Existing tank switching method operation during because of pipe
Track pitch is from longer, and the BOG amount of generation is relatively big, and tank switching speed is relatively slow, it addition, because not having on main pipeline
There is regulation valve uncontrollable tank switching flow.
Summary of the invention
The technical problem to be solved is to provide a kind of utilization improving tank switching efficiency and controllability
The method that LNG low pressure external transport pipeline carries out tank switching.
The technical scheme is that one utilizes LNG low pressure external transport pipeline
The method carrying out tank switching, comprises the following steps:
1) LNG is poured into before the second storage tank from the first storage tank, first release on LNG low pressure external transport pipeline
The interlocking of the second low pressure pump outlet pneumatic operated valve；
2) the first discharging pipeline hand-operated valve of being then shut off on discharging pipeline, the second discharging pipeline hand-operated valve,
3rd discharging pipeline hand-operated valve and the 4th discharging pipeline hand-operated valve, close on the first low-lift pump minimum reflux line
The first minimum reflux linear flow rate control valve, close the first harbour pipeloop gas on harbour pipeloop
Dynamic valve and the second harbour pipeloop pneumatic operated valve；
3) start the first low-lift pump, open the first low pressure pump outlet pneumatic operated valve, the second low pressure pump outlet gas
Dynamic valve, opens the second minimum reflux linear flow rate control valve on the second low-lift pump minimum reflux line；
4) the LNG defeated pipe outside described LNG low pressure got by the first low-lift pump in the first storage tank
Line, the most again by described second low-lift pump minimum reflux line, and utilizes described second minimum reflux line stream
Control valve regulation tank switching flow, pours into described LNG in the second storage tank.
The invention has the beneficial effects as follows:
The method of the present invention is shortened by distance, utilizes low-lift pump minimum reflux line to carry out tank switching operation, just
The generation of LNG receiving station BOG can be reduced, improve tank switching efficiency, improve controllability etc. simultaneously.
On the basis of technique scheme, the present invention can also do following improvement.
Further, in step 4) in, utilize described second minimum reflux linear flow rate control valve regulation tank switching
Flow is 370 cubes ms/h.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes LNG low pressure external transport pipeline to carry out the schematic flow sheet of method of tank switching；
In accompanying drawing, the list of parts representated by each label is as follows:
1, the first storage tank, the 2, first discharging pipeline hand-operated valve, the 3, second discharging pipeline hand-operated valve, 4,
First low pressure pump outlet check valve, the 5, first minimum reflux linear flow rate control valve, the 6, first low pressure pumps out
Mouth pneumatic operated valve, the 7, second storage tank, the 8, the 3rd discharging pipeline hand-operated valve, the 9, the 4th discharging pipeline is manual
Valve, the 10, second low pressure pump outlet check valve, the 11, second minimum reflux linear flow rate control valve, 12,
Two low pressure pump outlet pneumatic operated valves, the 13, first harbour pipeloop pneumatic operated valve, the 14, second harbour circulation pipe
Line pneumatic operated valve, 15, flow control valve, 16, discharging pipeline, 17, harbour pipeloop, 18, LNG
Low pressure external transport pipeline, the 19, first low-lift pump, the 20, second low-lift pump.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining this
Invention, is not intended to limit the scope of the present invention.
As it is shown in figure 1, discharging pipeline 16 is provided with the first discharging pipeline hand-operated valve 2, the second discharging pipeline
Hand-operated valve 3, the 3rd discharging pipeline hand-operated valve 8, the 4th discharging pipeline hand-operated valve 9, discharging pipeline 16
In termination inserts the first storage tank 1 respectively and in the second storage tank 7；LNG low pressure external transport pipeline is provided with first
Low pressure pump outlet check valve 4, the first low pressure pump outlet pneumatic operated valve 6, the second low pressure pump outlet pneumatic operated valve 12,
Second low pressure pump outlet check valve 10 and flow control valve 15；Harbour pipeloop 17 is provided with first yard
Head pipeloop pneumatic operated valve 13, the second harbour pipeloop pneumatic operated valve 14；It is provided with in first storage tank 1
It is provided with the second low-lift pump 20 in one low-lift pump 19 and the second storage tank 7；First minimum reflux linear flow rate controls
Valve 5 is located on the first minimum reflux line, and the first minimum reflux line is low with discharging pipeline 16 and LNG respectively
Pressure external transport pipeline 18 is connected；Second minimum reflux linear flow rate control valve 11 is located at the second minimum reflux line
On, the second minimum reflux line is connected with discharging pipeline 16 and LNG low pressure external transport pipeline 18 respectively；Code
Head pipeloop 17 is connected with LNG low pressure external transport pipeline 18；The two ends of LNG low pressure external transport pipeline 18
It is connected with the first low-lift pump 19 in the first storage tank 1 and the second low-lift pump 20 in the second storage tank 7 respectively
Connect.
A kind of method that the LNG of utilization low pressure external transport pipeline carries out tank switching, (direction of arrow is as shown in Figure 1
The idiographic flow of tank switching), comprise the following steps:
1) LNG is poured into before the second storage tank 7 from the first storage tank 1, first release the outer defeated pipe of LNG low pressure
The interlocking of the second low pressure pump outlet pneumatic operated valve 12 on line 18；
2) first discharging pipeline hand-operated valve the 2, the second discharging pipeline hands being then shut off on discharging pipeline 16
Dynamic valve the 3, the 3rd discharging pipeline hand-operated valve 8 and the 4th discharging pipeline hand-operated valve 9, close the first low-lift pump
The first minimum reflux linear flow rate control valve 5 on minimum reflux line, closes the on harbour pipeloop 17
One harbour pipeloop pneumatic operated valve 13 and the second harbour pipeloop pneumatic operated valve 14,；
3) start the first low-lift pump 19, open first low pressure pump outlet pneumatic operated valve the 6, second low pressure and pump out
Mouth pneumatic operated valve 12, opens the second minimum reflux linear flow rate control valve on the second low-lift pump minimum reflux line
11；
4) LNG got by the first low-lift pump 19 in the first storage tank 1 is outside described LNG low pressure
Defeated pipeline 18, the most again by described second low-lift pump minimum reflux line, and utilizes described second minimum time
Streamline flow control valve 11 regulates tank switching flow and is 370 cubes ms/h, pours described LNG into second
In storage tank 7.
Hereinafter again by actual mechanical process, LNG low pressure external transport pipeline is utilized further illustrating the present invention
The method carrying out tank switching:
XX province LNG, in 20XX XX day month XX, because 4# tank discharging pipeline cannot come into operation, uses LNG
Low pressure external transport pipeline carries out tank switching, utilizes low pressure pump outlet minimum reflux linear flow rate control valve FV to control stream
Amount, three low pressure external transport pipeline aggregate flows reach 1110m3/ h, does not carries out BOG emptying during tank switching,
Reach Expected Results.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (2)
1. one kind utilizes the method that LNG low pressure external transport pipeline carries out tank switching, it is characterised in that include with
Lower step:
1) LNG is poured into before the second storage tank from the first storage tank, first release on LNG low pressure external transport pipeline
The interlocking of the second low pressure pump outlet pneumatic operated valve；
2) the first discharging pipeline hand-operated valve of being then shut off on discharging pipeline, the second discharging pipeline hand-operated valve,
3rd discharging pipeline hand-operated valve and the 4th discharging pipeline hand-operated valve, close on the first low-lift pump minimum reflux line
The first minimum reflux linear flow rate control valve, close the first harbour pipeloop gas on harbour pipeloop
Dynamic valve and the second harbour pipeloop pneumatic operated valve；
3) start the first low-lift pump, open the first low pressure pump outlet pneumatic operated valve, the second low pressure pump outlet gas
Dynamic valve, opens the second minimum reflux linear flow rate control valve on the second low-lift pump minimum reflux line；
4) the LNG defeated pipe outside described LNG low pressure got by the first low-lift pump in the first storage tank
Line, the most again by described second low-lift pump minimum reflux line, and utilizes described second minimum reflux line stream
Control valve regulation tank switching flow, pours into described LNG in the second storage tank.
The method that the LNG of utilization low pressure external transport pipeline the most according to claim 1 carries out tank switching, its
It is characterised by, in step 4) in, utilize described second minimum reflux linear flow rate control valve regulation tank switching stream
Amount is 370 cubes ms/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240743.0A CN104879649B (en) | 2015-05-13 | 2015-05-13 | Method for transferring tank by using LNG low-pressure external pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240743.0A CN104879649B (en) | 2015-05-13 | 2015-05-13 | Method for transferring tank by using LNG low-pressure external pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104879649A CN104879649A (en) | 2015-09-02 |
| CN104879649B true CN104879649B (en) | 2017-01-04 |
Family
ID=53947254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510240743.0A Expired - Fee Related CN104879649B (en) | 2015-05-13 | 2015-05-13 | Method for transferring tank by using LNG low-pressure external pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104879649B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109163216B (en) * | 2018-09-26 | 2024-02-09 | 苏州市创优净化科技有限公司 | Safe intelligent liquid ammonia vaporization system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH656694A5 (en) * | 1982-08-16 | 1986-07-15 | Bruno A Mock | CONTROL ARM TO BE INSERTED INTO THE FLOW PATHS OF A PLANT FOR REFILLING GAS-SHAPED AND / OR LIQUID-GAS SHAPED PRESSURE MEDIA. |
| JP2001226684A (en) * | 2000-02-17 | 2001-08-21 | Air Liquide Japan Ltd | Gas supply facility |
| JP2006275134A (en) * | 2005-03-29 | 2006-10-12 | Osaka Gas Co Ltd | Liquefied gas transfer system |
| CN101709708A (en) * | 2009-12-14 | 2010-05-19 | 江苏双轮泵业机械制造有限公司 | Automatically-controlling liquid-unloading pump |
| CN202852423U (en) * | 2012-09-27 | 2013-04-03 | 鞍钢股份有限公司 | Acid liquor storage system convenient for tank switching operation |
| CN203628254U (en) * | 2013-12-13 | 2014-06-04 | 自贡通达机器制造有限公司 | LNG (liquefied natural gas) dual-pump dual-tank rapidly liquid adding device |
| CN203979869U (en) * | 2014-07-28 | 2014-12-03 | 北京长征天民高科技有限公司 | LNG gas station has the liquid system of unloading that reduces discharging BOG |
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2015
- 2015-05-13 CN CN201510240743.0A patent/CN104879649B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN104879649A (en) | 2015-09-02 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170104 Termination date: 20190513 |