CN108980618A - A kind of chilldown system and method for LNG receiving station large diameter pipeline - Google Patents
A kind of chilldown system and method for LNG receiving station large diameter pipeline Download PDFInfo
- Publication number
- CN108980618A CN108980618A CN201810947202.5A CN201810947202A CN108980618A CN 108980618 A CN108980618 A CN 108980618A CN 201810947202 A CN201810947202 A CN 201810947202A CN 108980618 A CN108980618 A CN 108980618A
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- Prior art keywords
- nitrogen
- large diameter
- pipeline
- diameter pipeline
- cooled
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention relates to a kind of chilldown system and method for LNG receiving station large diameter pipeline, which includes cooled large diameter pipeline, storage tank, gas phase return duct, flare vent system and nitrogen-filling system；The outlet end of cooled large diameter pipeline is connected in parallel multiple storage tanks, and the top gas phase outlet of storage tank is connected by gas phase return duct with flare vent system；Note nitrogen point is provided on cooled large diameter pipeline, note nitrogen point connects a nitrogen-filling system；Nitrogen-filling system includes liquid nitrogen source and gasifier, and liquid nitrogen source is connected in parallel the input end of more than two gasifiers by connecting pipeline, and the outlet end of gasifier is connected through connecting pipeline, shut-off valve and orifice flowmeter with the note nitrogen point on cooled large diameter pipeline.The present invention utilizes the cooling large aperture pipeline of nitrogen, it is possible to reduce the discharge of greenhouse gases, effect on environment very little save LNG receiving station and cost are pre-chilled, and can improve precooling effect with flexible modulation precooling speed, reduce tube-cooled risk.
Description
Technical field
The present invention relates to a kind of pipeline chilldown system and methods, are specifically directly realized by using liquid nitrogen to LNG about a kind of
The chilldown system and method for cooling, the pre-cooling effect of (liquefied natural gas) receiving station large diameter pipeline.
Background technique
LNG process pipe is the important way for connecting and realizing each unit operation of LNG receiving station.Since LNG has
There is the characteristic of ultralow temperature, temperature is generally -165 DEG C, and therefore, LNG process pipe uses the austenite stainless of low temperature performance excellent
Steel.Due to the characteristic of process pipe material, there are cold events during the decline of fluids within pipes temperature, the stress generated
It can exceed that the yield strength of material and be damaged, especially bigbore process pipe, the consequence that goes wrong will very
Seriously.Therefore, it goes into operation for LNG receiving station before unloading first LNG ship, needs that process pipe is pre-chilled, it is especially right
Heavy caliber process pipe gone into operation before pre-cooling work, in this way can with the designing quality of comprehensive test pipeline, construction quality and
The matter of the stress variation situation and pipeline of pipeline, equipment, the cryogenic property of valve and sealing performance, cold insulation construction and material
Amount etc. reserves the sufficient rectification time before first ship test run, also ensures the building ring in safety to find the problem early
The problem is rectified and improved under border.Process pipe is carried out in advance using BOG (flashed vapour) currently, common forecooling method has
It is cold, but the method has two: and one, compared to liquid nitrogen, BOG unit price is higher；Two, it is provided due to BOG by tanker, pipeline
Precooling speed is limited by ship, and if pre-cooling go wrong, risk is larger, and the tanker residence time accordingly lengthens.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide one kind can substantially save pre-cooling cost, tube-cooled wind is reduced
Danger, while the chilldown system and method for LNG receiving station large diameter pipeline of the pre- cold efficiency of pipeline can be improved.
To achieve the above object, the present invention takes following technical scheme: a kind of for the pre- of LNG receiving station large diameter pipeline
Cooling system, which is characterized in that the chilldown system includes cooled large diameter pipeline (1), LNG storage tank (2), gas phase return duct
(3), flare vent system (4) and nitrogen-filling system (5)；The input end of the cooled large diameter pipeline (1) is laid on harbour (6)
Interior, outlet end is connected in parallel multiple LNG storage tanks (2)；The top gas phase outlet of each LNG storage tank (2) passes through institute
It states gas phase return duct (3) to be connected with the flare vent system (4), and close to the flare vent system (4) side
The gas phase return duct (3) is by bypass line (7) and close to the cooled large diameter pipeline of the harbour (6) side
(1) it is connected to；More than one note nitrogen point (8), each note nitrogen point are provided on the cooled large diameter pipeline (1)
(8) it is all connected with a nitrogen-filling system (5)；The nitrogen-filling system (5) includes liquid nitrogen source and gasifier (52), and the liquid nitrogen source is logical
The input end that connecting pipeline is connected in parallel more than two gasifiers (52) is crossed, the outlet end of the gasifier (52) is through connecting
Pipeline, shut-off valve (53) and orifice flowmeter (54) are connected with the note nitrogen point (8) on the cooled large diameter pipeline (1)
It connects.
In a preferred embodiment, the liquid nitrogen source is mobile liquid nitrogen storage tank (51) or liquid nitrogen tank car (9), described
Liquid nitrogen tank car (9) is connected by jumper hose (10) with the connecting pipeline of the gasifier (52).
In a preferred embodiment, close to described mobile liquid nitrogen storage tank (51) or jumper hose (10) outlet end
Connecting pipeline and close to the gasifier (52) input end connecting pipeline on be provided with for adjusting nitrogen flow
Regulating valve (55).
In a preferred embodiment, in the connecting pipeline close to the gasifier (52) inlet end and an outlet end
It is provided with drain valve (56).
In a preferred embodiment, pressure is additionally provided in the connecting pipeline for being located at the gasifier (52) outlet end
Power table (57) and thermometer (58).
In a preferred embodiment, the cooled large diameter pipeline (1) is divided into tank area, process island and harbour
The note nitrogen point (8) is respectively arranged in three, area region, each region.
A kind of forecooling method for LNG receiving station large diameter pipeline realizes, feature exists using above-mentioned chilldown system
In, the forecooling method the following steps are included:
1) position and the quantity of note nitrogen point (8) are chosen on cooled large diameter pipeline (1) according to pre-cooling scheme；
2) nitrogen-filling system (5) are connected in each note nitrogen point (8), liquid nitrogen is changed into cryogenic nitrogen after gasifier (52)
Gas, low temperature nitrogen flow through orifice flowmeter (54) and inject cooled large diameter pipeline (1) afterwards；
3) flow direction of low temperature nitrogen and practical discharge direction are on the contrary, using low temperature nitrogen by cooled large diameter pipeline
(1) temperature is gradually cooled down to -110 DEG C~-120 DEG C by room temperature；
4) low temperature nitrogen after being pre-chilled enters gas phase return duct (3) by the bridging of liquid phase arm and gas phase arm, final logical
Cross flare vent system (4) emptying.
The invention adopts the above technical scheme, which has the following advantages: the present invention utilizes the cooling large-aperture pipe of nitrogen
Road, it is possible to reduce the discharge of greenhouse gases, effect on environment very little save LNG receiving station and cost are pre-chilled, can be pre- with flexible modulation
Speed of cooling improves precooling effect, reduces tube-cooled risk.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of chilldown system of the present invention；
Fig. 2 is the structural schematic diagram of nitrogen-filling system of the present invention.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.It should be appreciated, however, that the offer of attached drawing is only
For a better understanding of the present invention, they should not be interpreted as limitation of the present invention.
As shown in Figure 1, the chilldown system provided by the present invention for LNG receiving station large diameter pipeline includes the big mouth that is cooled
Diameter pipeline 1, LNG storage tank 2, gas phase return duct 3, flare vent system 4 and nitrogen-filling system 5.Cooled large diameter pipeline 1 into
Mouth end is laid in harbour 6, and outlet end is connected in parallel multiple LNG storage tanks 2.The top gas phase outlet of each LNG storage tank 2 passes through
Gas phase return duct 3 is connected with flare vent system 4, and the gas phase return duct 3 close to 4 side of flare vent system passes through
Bypass line 7 is connected to the cooled large diameter pipeline 1 close to 6 side of harbour.One is provided on cooled large diameter pipeline 1
A above note nitrogen point 8, each note nitrogen point 8 are all connected with a nitrogen-filling system 5.
As shown in Fig. 2, nitrogen-filling system 5 includes mobile liquid nitrogen storage tank 51 and gasifier 52, mobile liquid nitrogen storage tank 51 is logical
The input end that connecting pipeline is connected in parallel more than two gasifiers 52 is crossed, the outlet end of gasifier 52 is through connecting pipeline, shut-off valve
53 and orifice flowmeter 54 be connected with the note nitrogen point 8 on cooled large diameter pipeline 1.
In a preferred embodiment, low temperature nitrogen can also be provided using liquid nitrogen tank car 9, liquid nitrogen tank car 9 is logical at this time
Jumper hose 10 is crossed to be connected with the connecting pipeline of gasifier 52.
In a preferred embodiment, in the connecting tube close to mobile liquid nitrogen storage tank 51 or 10 outlet end of jumper hose
The regulating valve 55 for adjusting nitrogen flow is provided in the connecting pipeline of line and close 52 input end of gasifier.
In a preferred embodiment, it is provided in the connecting pipeline close to 52 inlet end and an outlet end of gasifier
Drain valve 56, when connecting pipeline hypertonia, pressure release is exhausted in the opening of drain valve 56, prevents connecting pipeline superpressure.
In a preferred embodiment, pressure gauge 57 is additionally provided in the connecting pipeline for being located at 52 outlet end of gasifier
With thermometer 58.
In a preferred embodiment, in order to make precooling effect reach best, efficiency highest, it is generally the case that will be by
Cooling large diameter pipeline 1 divides for tank area, process island and the region of quayside three, and a note nitrogen point 8 is respectively arranged in each region,
To avoid process island and quayside line temperature from the phenomenon that reducing slow or excessive temperature differentials occur.
The chilldown system provided based on the above embodiment, the invention also provides one kind to be used for LNG receiving station large-diameter pipe
The forecooling method in road comprising following steps:
1) position and the quantity for choosing note nitrogen point 8 on cooled large diameter pipeline 1 according to pre-cooling scheme, infuse nitrogen point 8
Position and quantity need meet in the case where Best Economy and cooling rate complete pre-cooling work；
2) nitrogen-filling system 5 being connected in each note nitrogen point 8, liquid nitrogen is supplied by mobile liquid nitrogen storage tank 51 or liquid nitrogen tank car 9,
Liquid nitrogen is changed into low temperature nitrogen after gasifier 52, and low temperature nitrogen injects cooled large-diameter pipe after flowing through orifice flowmeter 54
Road 1；
3) flow direction of low temperature nitrogen and practical discharge direction are on the contrary, flow to quayside from tank area, by way of technique
Area, cooled 1 temperature of large diameter pipeline is gradually cooled down to -110 DEG C~-120 DEG C by room temperature using low temperature nitrogen；
4) low temperature nitrogen after being pre-chilled enters gas phase return duct 3 by the bridging of liquid phase arm and gas phase arm, eventually by
Flare vent system 4 is vented, it is ensured that the safety of low temperature nitrogen discharge.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied, all equivalents and improvement carried out based on the technical solution of the present invention should not exclude
Except protection scope of the present invention.
Claims (7)
1. a kind of chilldown system for LNG receiving station large diameter pipeline, which is characterized in that the chilldown system includes cooled big
Caliber pipe (1), LNG storage tank (2), gas phase return duct (3), flare vent system (4) and nitrogen-filling system (5)；
The input end of the cooled large diameter pipeline (1) is laid in harbour (6), and outlet end is connected in parallel multiple LNG
Storage tank (2)；It is put by the gas phase return duct (3) with the torch top gas phase outlet of each LNG storage tank (2)
Empty set system (4) is connected, and the gas phase return duct (3) close to the flare vent system (4) side passes through bypass pipe
Line (7) is connected to the cooled large diameter pipeline (1) close to the harbour (6) side；In the cooled large-diameter pipe
More than one note nitrogen point (8) is provided on road (1), each note nitrogen point (8) is all connected with a nitrogen-filling system (5)；
The nitrogen-filling system (5) includes liquid nitrogen source and gasifier (52), and the liquid nitrogen source is connected in parallel two by connecting pipeline
The input end of gasifier (52) described above, the outlet end of the gasifier (52) is through connecting pipeline, shut-off valve (53) and orifice plate
Flowmeter (54) is connected with the note nitrogen point (8) on the cooled large diameter pipeline (1).
2. chilldown system as described in claim 1, which is characterized in that the liquid nitrogen source is mobile liquid nitrogen storage tank (51) or liquid
Nitrogen tank car (9), the liquid nitrogen tank car (9) are connected by jumper hose (10) with the connecting pipeline of the gasifier (52).
3. chilldown system as claimed in claim 2, which is characterized in that close to the mobile liquid nitrogen storage tank (51) or bridging
It is provided with and is used in the connecting pipeline of hose (10) outlet end and the connecting pipeline of the close gasifier (52) input end
Adjust the regulating valve (55) of nitrogen flow.
4. such as the described in any item chilldown systems of claims 1 to 3, which is characterized in that close to the gasifier (52) import
Drain valve (56) are provided in the connecting pipeline of end and outlet end.
5. such as the described in any item chilldown systems of claims 1 to 3, which is characterized in that exported being located at the gasifier (52)
Pressure gauge (57) and thermometer (58) are additionally provided in the connecting pipeline at end.
6. such as the described in any item chilldown systems of claims 1 to 3, which is characterized in that by the cooled large diameter pipeline (1)
It is divided into tank area, process island and the region of quayside three, the note nitrogen point (8) is respectively arranged in each region.
7. a kind of forecooling method for LNG receiving station large diameter pipeline, described in any item pre- using such as claims 1 to 6
Cooling system realize, which is characterized in that the forecooling method the following steps are included:
1) position and the quantity of note nitrogen point (8) are chosen on cooled large diameter pipeline (1) according to pre-cooling scheme；
2) nitrogen-filling system (5) are connected in each note nitrogen point (8), liquid nitrogen is changed into low temperature nitrogen after gasifier (52), low
Warm nitrogen flows through orifice flowmeter (54) and injects cooled large diameter pipeline (1) afterwards；
3) flow direction of low temperature nitrogen and practical discharge direction are on the contrary, using low temperature nitrogen by cooled large diameter pipeline (1)
Temperature is gradually cooled down to -110 DEG C~-120 DEG C by room temperature；
4) low temperature nitrogen after being pre-chilled enters gas phase return duct (3) by the bridging of liquid phase arm and gas phase arm, eventually by fire
Torch blowdown system (4) emptying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810947202.5A CN108980618A (en) | 2018-08-20 | 2018-08-20 | A kind of chilldown system and method for LNG receiving station large diameter pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810947202.5A CN108980618A (en) | 2018-08-20 | 2018-08-20 | A kind of chilldown system and method for LNG receiving station large diameter pipeline |
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| CN108980618A true CN108980618A (en) | 2018-12-11 |
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| CN201810947202.5A Pending CN108980618A (en) | 2018-08-20 | 2018-08-20 | A kind of chilldown system and method for LNG receiving station large diameter pipeline |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057658A (en) * | 2019-04-22 | 2019-07-26 | 龙源 | The cooling device and method of half gas low temperature high-pressure metal pipe explosion bulge test of heavy caliber |
| CN110058618A (en) * | 2019-05-06 | 2019-07-26 | 龙源 | A kind of temperature accuracy control method for the experiment of half gas low temperature pipeline of heavy caliber |
| CN110145684A (en) * | 2019-05-31 | 2019-08-20 | 中国空分工程有限公司 | A kind of low-temperature storage tank chilldown system and forecooling method |
| CN112762353A (en) * | 2021-02-01 | 2021-05-07 | 东华工程科技股份有限公司 | LNG (liquefied Natural gas) conveying pipeline device and method for precooling by using BOG (boil off gas) |
| CN113124320A (en) * | 2021-04-30 | 2021-07-16 | 西安航天动力研究所 | Rapid precooling method for low-temperature medium pipeline system |
| CN114688447A (en) * | 2020-12-29 | 2022-07-01 | 连云港石化有限公司 | Receiving system of long-distance large-diameter pipeline and start-up method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057658A (en) * | 2019-04-22 | 2019-07-26 | 龙源 | The cooling device and method of half gas low temperature high-pressure metal pipe explosion bulge test of heavy caliber |
| CN110058618A (en) * | 2019-05-06 | 2019-07-26 | 龙源 | A kind of temperature accuracy control method for the experiment of half gas low temperature pipeline of heavy caliber |
| CN110145684A (en) * | 2019-05-31 | 2019-08-20 | 中国空分工程有限公司 | A kind of low-temperature storage tank chilldown system and forecooling method |
| CN110145684B (en) * | 2019-05-31 | 2023-08-29 | 中国空分工程有限公司 | Precooling system and precooling method for low-temperature storage tank |
| CN114688447A (en) * | 2020-12-29 | 2022-07-01 | 连云港石化有限公司 | Receiving system of long-distance large-diameter pipeline and start-up method thereof |
| CN114688447B (en) * | 2020-12-29 | 2024-06-04 | 连云港石化有限公司 | Receiving system of long-distance large-diameter pipeline and starting method thereof |
| CN112762353A (en) * | 2021-02-01 | 2021-05-07 | 东华工程科技股份有限公司 | LNG (liquefied Natural gas) conveying pipeline device and method for precooling by using BOG (boil off gas) |
| CN112762353B (en) * | 2021-02-01 | 2024-06-04 | 东华工程科技股份有限公司 | Device and method for precooling LNG (liquefied Natural gas) conveying pipeline by using BOG (boil off gas) |
| CN113124320A (en) * | 2021-04-30 | 2021-07-16 | 西安航天动力研究所 | Rapid precooling method for low-temperature medium pipeline system |
| CN113124320B (en) * | 2021-04-30 | 2022-07-05 | 西安航天动力研究所 | Rapid precooling method for low-temperature medium pipeline system |
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Application publication date: 20181211 |