CN102878425A - Device for avoiding liquid layering in liquefied natural gas storage tank - Google Patents
Device for avoiding liquid layering in liquefied natural gas storage tank Download PDFInfo
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- CN102878425A CN102878425A CN2012104061626A CN201210406162A CN102878425A CN 102878425 A CN102878425 A CN 102878425A CN 2012104061626 A CN2012104061626 A CN 2012104061626A CN 201210406162 A CN201210406162 A CN 201210406162A CN 102878425 A CN102878425 A CN 102878425A
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- natural gas
- convex closure
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Abstract
The invention discloses a device for avoiding liquid layering in a liquefied natural gas storage tank. The device comprises the liquefied natural gas storage tank, a convex hull, an electromagnetic valve, a pressure transmitter, an electromagnetic valve control device, a convex hull liquid inlet pipe, a liquid inlet check valve, a convex hull liquid outlet pipe, a liquid outlet check valve and a floating ball. The convex hull is arranged above the interior of the liquefied natural gas storage tank, the electromagnetic valve is mounted at the top of the convex hull, the pressure transmitter is provided with two input ends and an output end, one of the input ends is connected with the electromagnetic valve, the outer input end is connected with the convex hull, and the output end is connected with the electromagnetic valve control device which is connected with the electromagnetic valve. The liquid inlet check valve is arranged on the convex hull liquid inlet pipe, the liquid outlet check valve is arranged on the convex hull liquid outlet pipe, and the floating ball is connected with the tail end of the convex hull liquid outlet pipe and provided with a plurality of holes. The device is simple in structure, convenient to operate and high in flexibility and safety.
Description
Technical field
The present invention relates to the field of storage of LNG Liquefied natural gas, relate in particular to a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank.
Background technique
LNG Liquefied natural gas is rock gas through after dehydration, depickling, taking off the purification craft such as heavy hydrocarbon, the mixture take methane as key component that obtains by multiple means cooling liquefaction again.In storage process, the steam output of each component is more different than regular meeting LNG Liquefied natural gas when initial, thereby can cause that the composition of LNG Liquefied natural gas and density change.Thereby cause leaving standstill for a long time rear generation stratification.In addition, when replenishing LNG Liquefied natural gas toward liquefied natural gas (LNG) tank, remaining LNG Liquefied natural gas density is different also can produce stratification because the new LNG Liquefied natural gas of injecting and storage tank are interior.
When obvious stratification appears in the LNG Liquefied natural gas in the storage tank, because the inhibitory action of upper strata LNG Liquefied natural gas static pressure so that the extraneous heat that imports into can't make the LNG Liquefied natural gas of lower floor in time evaporate, causes lower floor's LNG Liquefied natural gas to be in hypersaturated state.When the density of the LNG Liquefied natural gas on storage tank upper strata during greater than lower floor's LNG Liquefied natural gas, lower floor's LNG Liquefied natural gas rises suddenly, causes rapid evaporation, rollover phenomenon occuring, cause that tank inner pressure increases suddenly, causes a large amount of rock gases emptying, cause serious waste, even destroy the safety installations of storage tank.External have the greatest impact two of occuring are because the accident of rolling and causing: one is Italian SNAM LNG Liquefied natural gas storage and distribution station accident in 1971, causes the liquefied natural gas vaporization emptying of nearly 140t; Two is accidents of place's LNG Liquefied natural gas storage and distribution station of British Gas company in 1993, causes the LNG Liquefied natural gas loss of 150t.The husky LNG Liquefied natural gas storage and distribution station of China's Changsha in 2005 star leakage accident also produces layering owing to LNG Liquefied natural gas in the spherical storage tank and rolling causes.
For this technical problem the comparison effective method is arranged not yet at present.Although for example adopt the method for LNG Liquefied natural gas in the recycle pump Forced Mixing storage tank can play the effect that solves rolling, also have drawback: the first, in case the realization condition of the method is to find LNG Liquefied natural gas layering in the storage tank, start immediately recycle pump.Because if may trigger rolling when restarting recycle pump during the long-time layering of LNG Liquefied natural gas in the storage tank.This just need to have the equipment of accurate detection LNG Liquefied natural gas layering; The second, on safety, consider with operation, starting recycle pump needs manual operation, because the uncertainty of LNG Liquefied natural gas separation time can be made troubles to operator; The 3rd, in the recycle pump working procedure, the LNG Liquefied natural gas in the pipeline is more from external world's heat absorption, can accelerate tank inner pressure and increase.
Liquid layered is the necessary condition that produces rolling in the storage tank, therefore, is necessary to provide a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank.
Summary of the invention
A technical problem to be solved by this invention is: a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank is provided.
For solving the problems of the technologies described above, the present invention adopts following technological scheme: a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank, comprise: liquefied natural gas (LNG) tank, convex closure, solenoid valve, pressure transmitter, magnetic valve controller, the convex closure liquid inlet pipe, the feed liquor one-way valve, the convex closure drain pipe, fluid one-way valve and ball float, described convex closure is arranged at the top in the liquefied natural gas (LNG) tank, described solenoid valve is installed on the convex closure top, described pressure transmitter is provided with two input ends and an output terminal, one of them input end links to each other with liquefied natural gas (LNG) tank, another input end links to each other with convex closure, described output terminal links to each other with magnetic valve controller, described magnetic valve controller is connected with solenoid valve, described feed liquor one-way valve is arranged on the convex closure liquid inlet pipe, described fluid one-way valve is arranged on the convex closure drain pipe, described ball float is connected in the end of convex closure drain pipe, offers several holes on the described ball float.
Preferably, in said apparatus, described device also comprises pressure piping, and described pressure piping comprises: boosting vaporizer, pressure charging valve and pipe fitting, one end of described pressure piping links to each other with the upper end of liquefied natural gas (LNG) tank, and the other end links to each other with the lower end of liquefied natural gas (LNG) tank.
Preferably, in said apparatus, described convex closure is funnel shape, and described convex closure is fixed on top in the liquefied natural gas (LNG) tank tank by support welding.
Preferably, in said apparatus, the bottom of described convex closure offers circular hole, and described convex closure liquid inlet pipe is installed in the circular hole and with convex closure and welds mutually.
Preferably, in said apparatus, the upper end mouth of pipe and the distance between the convex closure top of described convex closure liquid inlet pipe are 10-20cm.
Preferably, in said apparatus, described convex closure drain pipe comprises fluid straight tube and the fluid flexible pipe that links to each other with the fluid straight tube, and described fluid straight tube is arranged at the side of convex closure bottom.
Preferably, in said apparatus, described convex closure drain pipe is cryogenic hose, and density is less than 400kg/m
3
Preferably, in said apparatus, described ball float density is less than 400kg/m
3
Beneficial effect of the present invention: the device of liquid layered is by arranging convex closure in the liquefied natural gas (LNG) tank avoided among the present invention in liquefied natural gas (LNG) tank, extraneous heat transmission makes a part of liquefied natural gas vaporization, inner and the outside pressure difference that produces of convex closure, intermittently the LNG Liquefied natural gas with tank bottom is pressed in the convex closure, be ejected into storage tank top from convex closure again, thereby LNG Liquefied natural gas in the mixing storage tank, avoid producing in the storage tank liquid layered, apparatus structure among the present invention is simple, easy to operate, can require to select automatically operation or manual control according to actual motion, have higher flexibility and Security.
Description of drawings
Fig. 1 is the structural representation that can avoid the device of liquid layered in the liquefied natural gas (LNG) tank among the present invention.
Among Fig. 1: 1, liquefied natural gas (LNG) tank, 2, convex closure, 3, solenoid valve, 4, pressure transmitter, 5, magnetic valve controller, 6, the convex closure liquid inlet pipe, 7, feed liquor one-way valve, 8, the convex closure drain pipe, 9, the fluid one-way valve, 10, ball float, 11, the hole, 12, boosting vaporizer, 13, pressure charging valve, 14, pipe fitting, 15, the fluid straight tube, 16, the fluid flexible pipe.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
See also Fig. 1, a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank, comprise: liquefied natural gas (LNG) tank 1, convex closure 2, solenoid valve 3, pressure transmitter 4, magnetic valve controller 5, convex closure liquid inlet pipe 6, feed liquor one-way valve 7, convex closure drain pipe 8, fluid one-way valve 9 and ball float 10, the effect of described pressure transmitter 4 are to change convex closure 2 inside and outside gas pressure difference into electric signal transmission to magnetic valve controller 5.Described magnetic valve controller 5 has automatically and manual two kinds of control modes, under automatic control mode, magnetic valve controller 5 receives the electrical signal of the inside and outside gas pressure difference of expression convex closure and the opening or closing by this electrical signal control solenoid valve 3 that is transmitted by pressure transmitter 4.Thereby so that when convex closure 2 inside and outside gas pressure difference during less than setting value, solenoid valve 3 cuts out; When convex closure 2 inside and outside gas pressure difference during greater than setting value, solenoid valve 3 is opened, and again receives electrical signal after delaying time 15 minutes.Under manual control mode, can force artificially to control the opening and closing of solenoid valve 3.Described convex closure is arranged at the top in the liquefied natural gas (LNG) tank 1, described solenoid valve 3 is installed on convex closure 2 tops, described pressure transmitter 4 is provided with two input ends and an output terminal, one of them input end links to each other with liquefied natural gas (LNG) tank 1, another input end links to each other with convex closure 2, described output terminal links to each other with magnetic valve controller 5, described magnetic valve controller 5 is connected with solenoid valve 3, described feed liquor one-way valve 7 is arranged on the convex closure liquid inlet pipe 6, described fluid one-way valve 9 is arranged on the convex closure drain pipe 8, can guarantee that by feed liquor one-way valve 7 and fluid one-way valve 9 are set LNG Liquefied natural gas can only enter convex closure 2 by convex closure liquid inlet pipe 6 in the storage tank, convex closure 2 interior LNG Liquefied natural gas can only enter storage tank by convex closure drain pipe 8.Described ball float 10 is connected in the end of convex closure drain pipe 8, offers several holes 11 on the described ball float 10.The setting in this hole 11 can make convex closure 2 interior LNG Liquefied natural gas spray more uniformly.Described device also comprises pressure piping, and described pressure piping comprises: boosting vaporizer 12, pressure charging valve 13 and pipe fitting 14, and an end of described pressure piping links to each other with the upper end of liquefied natural gas (LNG) tank 1, and the other end links to each other with the lower end of liquefied natural gas (LNG) tank 1.Described pressure piping starts when needs improve hybrid frequency, its working principle is: allow a part of LNG Liquefied natural gas flow out storage tank, enter boosting vaporizer 12, change gaseous state into after the liquified natural gas heat absorption, then gaseous natural gas is got back to storage tank through pressure piping, increase rapidly the air pressure of convex closure 2 outsides, with the convex closure 2 inner pressure differences that produce.Described convex closure 2 is funnel shape, thereby can make the ascensional range of the outer gas pressure of the caused convex closure of ascensional range liquefied natural gas vaporization much smaller than convex closure outside of gas pressure in the convex closure that liquefied natural gas vaporization causes in the convex closure, be conducive to the realization of the inside and outside gas pressure difference of further assurance convex closure on the basis of convection effect.Described convex closure 2 is fixed on top in liquefied natural gas (LNG) tank 1 tank by support welding.The bottom of described convex closure 2 offers circular hole, and described convex closure liquid inlet pipe 6 is installed in the circular hole and with convex closure 2 and welds mutually.The upper end mouth of pipe and the distance between the convex closure top of described convex closure liquid inlet pipe 6 are 10-20cm, and namely the convex closure liquid inlet pipe 6 upper end mouths of pipe because tank bottom LNG Liquefied natural gas temperature is relatively low, can slow down convex closure 2 interior gas pressures risings in the part near the convex closure top.Described convex closure drain pipe 8 comprises fluid straight tube 15 and the fluid flexible pipe 16 that links to each other with fluid straight tube 15, and described fluid straight tube 15 is arranged at the side of convex closure 2 bottoms.Described convex closure drain pipe 8 is cryogenic hose, and density is less than 400kg/m
3, described ball float 10 density are less than 400kg/m
3Thereby, make this device can not be subjected to the impact that liquid level changes in the storage tank,
The device of liquid layered is by at the liquefied natural gas (LNG) tank 1 interior convex closure 2 that arranges in the liquefied natural gas (LNG) tank avoided among the present invention, extraneous heat transmission makes the liquefied natural gas vaporization in a part of storage tank, the convex closure 2 inner and outside pressure differences that produce, intermittently the LNG Liquefied natural gas with tank bottom is pressed in the convex closure 2 by convex closure liquid inlet pipe 6, sprayed to the storage tank top by the hole 11 of convex closure drain pipe 8 on ball float 10 again, thereby LNG Liquefied natural gas in the mixing storage tank, avoid producing in the storage tank liquid layered, apparatus structure among the present invention is simple, easy to operate, can require to select automatically operation or manual control according to actual motion, have higher flexibility and Security.
It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment the present invention is had been described in detail, for a person skilled in the art, it still can be made amendment to the technological scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characteristics wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the device that can avoid liquid layered in the liquefied natural gas (LNG) tank, it is characterized in that, comprise: liquefied natural gas (LNG) tank, convex closure, solenoid valve, pressure transmitter, magnetic valve controller, the convex closure liquid inlet pipe, the feed liquor one-way valve, the convex closure drain pipe, fluid one-way valve and ball float, described convex closure is arranged at the top in the liquefied natural gas (LNG) tank, described solenoid valve is installed on the convex closure top, described pressure transmitter is provided with two input ends and an output terminal, one of them input end links to each other with liquefied natural gas (LNG) tank, another input end links to each other with convex closure, described output terminal links to each other with magnetic valve controller, described magnetic valve controller is connected with solenoid valve, described feed liquor one-way valve is arranged on the convex closure liquid inlet pipe, described fluid one-way valve is arranged on the convex closure drain pipe, described ball float is connected in the end of convex closure drain pipe, offers several holes on the described ball float.
2. a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank as claimed in claim 1, it is characterized in that: described device also comprises pressure piping, described pressure piping comprises: boosting vaporizer, pressure charging valve and pipe fitting, one end of described pressure piping links to each other with the upper end of liquefied natural gas (LNG) tank, and the other end links to each other with the lower end of liquefied natural gas (LNG) tank.
3. a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank as claimed in claim 2, it is characterized in that: described convex closure is funnel shape, and described convex closure is fixed on top in the liquefied natural gas (LNG) tank tank by support welding.
4. such as claim 1 or 2 or 3 described a kind of devices of avoiding liquid layered in the liquefied natural gas (LNG) tank, it is characterized in that: the bottom of described convex closure offers circular hole, and described convex closure liquid inlet pipe is installed in the circular hole and with convex closure and welds mutually.
5. a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank as claimed in claim 4, it is characterized in that: the upper end mouth of pipe and the distance between the convex closure top of described convex closure liquid inlet pipe are 10-20cm.
6. a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank as claimed in claim 5, it is characterized in that: described convex closure drain pipe comprises fluid straight tube and the fluid flexible pipe that links to each other with the fluid straight tube, and described fluid straight tube is arranged at the side bottom the convex closure.
7. a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank as claimed in claim 1, it is characterized in that: described convex closure drain pipe is cryogenic hose, and density is less than 400kg/m
3
8. a kind of device of avoiding liquid layered in the liquefied natural gas (LNG) tank as claimed in claim 1, it is characterized in that: described ball float density is less than 400kg/m
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210406162.6A CN102878425B (en) | 2012-10-23 | 2012-10-23 | Device for avoiding liquid layering in liquefied natural gas storage tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210406162.6A CN102878425B (en) | 2012-10-23 | 2012-10-23 | Device for avoiding liquid layering in liquefied natural gas storage tank |
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| Publication Number | Publication Date |
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| CN102878425A true CN102878425A (en) | 2013-01-16 |
| CN102878425B CN102878425B (en) | 2014-01-22 |
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| CN201210406162.6A Active CN102878425B (en) | 2012-10-23 | 2012-10-23 | Device for avoiding liquid layering in liquefied natural gas storage tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953069A (en) * | 2016-06-30 | 2016-09-21 | 日照海达尔加气设备有限公司 | Liquefied natural gas storage tank capable of preventing liquid from writhing and generating overpressure |
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2012
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953069A (en) * | 2016-06-30 | 2016-09-21 | 日照海达尔加气设备有限公司 | Liquefied natural gas storage tank capable of preventing liquid from writhing and generating overpressure |
| CN105953069B (en) * | 2016-06-30 | 2018-06-29 | 日照海达尔加气设备有限公司 | A kind of LNG tank for preventing liquid from seething superpressure |
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| CN102878425B (en) | 2014-01-22 |
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