CN102878425B - 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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- CN102878425B CN102878425B CN201210406162.6A CN201210406162A CN102878425B CN 102878425 B CN102878425 B CN 102878425B CN 201210406162 A CN201210406162 A CN 201210406162A CN 102878425 B CN102878425 B CN 102878425B
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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 liquefied natural gas (LNG) tank.
Background technique
LNG Liquefied natural gas is rock gas after the purification craft such as dehydration, depickling, de-heavy hydrocarbon, then the mixture that methane is key component of take of lower the temperature and being liquefied and obtain by multiple means.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 long-time standing rear generation stratification.In addition, when supplementing LNG Liquefied natural gas toward liquefied natural gas (LNG) tank, because the new LNG Liquefied natural gas of injecting also can produce stratification from remaining LNG Liquefied natural gas density is different in storage tank.
When obvious stratification appears in the LNG Liquefied natural gas in storage tank, due to the inhibitory action of upper strata LNG Liquefied natural gas static pressure, make the heat that the external world is imported into cannot make the LNG Liquefied natural gas of lower floor evaporate in time, cause lower floor's LNG Liquefied natural gas in hypersaturated state.When the density of the LNG Liquefied natural gas on storage tank upper strata is greater than LNG Liquefied natural gas Shi， lower floor of lower floor LNG Liquefied natural gas, rise suddenly, cause rapid evaporation, there is rollover phenomenon, cause that tank inner pressure increases suddenly, cause a large amount of rock gases emptying, cause serious waste, even destroy the safety installations of storage tank.The accident that external have the greatest impact two of occurring cause due to rolling: 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.China's husky LNG Liquefied natural gas storage and distribution station of Changsha star leakage accident in 2005 is also because LNG Liquefied natural gas in spherical storage tank produces layering and rolling causes.
For this technical problem, not yet there is at present comparison effective method.Although for example adopt the method for LNG Liquefied natural gas in recycle pump Forced Mixing storage tank can play the effect that solves rolling, also have drawback: the first, once the realization condition of the method is to find LNG Liquefied natural gas layering in storage tank, start immediately recycle pump.Because if restart recycle pump during the long-time layering of LNG Liquefied natural gas in storage tank, may trigger rolling.This just need to have the equipment of accurate detection LNG Liquefied natural gas layering; The second, safety, consider with operation, starting recycle pump needs manual operation, due to the uncertainty of LNG Liquefied natural gas separation time, can make troubles to operator; The 3rd, in recycle pump working procedure, the LNG Liquefied natural gas in pipeline is more from external world's heat absorption, can accelerate tank inner pressure and increase.
In storage tank, liquid layered is the necessary condition that produces rolling, therefore, is necessary to provide a kind of device of avoiding liquid layered in 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 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 liquefied natural gas (LNG) tank, comprise: liquefied natural gas (LNG) tank, convex closure, solenoid valve, pressure transmitter, magnetic valve controller, convex closure liquid inlet pipe, feed liquor one-way valve, convex closure drain pipe, fluid one-way valve and ball float, described convex closure is arranged at the top in liquefied natural gas (LNG) tank, described solenoid valve is installed on convex closure top, described pressure transmitter is provided with two input ends and an output terminal, one of them input end is connected with liquefied natural gas (LNG) tank, another input end is connected with convex closure, described output terminal is connected with magnetic valve controller, described magnetic valve controller is connected with solenoid valve, described feed liquor one-way valve is arranged on convex closure liquid inlet pipe, described fluid one-way valve is arranged on convex closure drain pipe, described ball float is connected in the end of convex closure drain pipe, on described ball float, offer several holes.
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 is connected with the upper end of liquefied natural gas (LNG) tank, and the other end is connected 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 the top in 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 circular hole and welds mutually with convex closure.
Preferably, in said apparatus, the upper end mouth of pipe and the distance between 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 being connected with 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: in the liquefied natural gas (LNG) tank avoided in the present invention, the device of liquid layered by arranging convex closure 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 of tank bottom is pressed in convex closure, from convex closure, be ejected into storage tank top again, thereby LNG Liquefied natural gas in mixing storage tank, avoid generation liquid layered in storage tank, apparatus structure in the present invention is simple, easy to operate, can require to select operation or manual control automatically according to actual motion, there is higher flexibility and Security.
Accompanying drawing explanation
Fig. 1 is the structural representation that can avoid the device of liquid layered in liquefied natural gas (LNG) tank in the present invention.
In Fig. 1: 1, liquefied natural gas (LNG) tank, 2, convex closure, 3, solenoid valve, 4, pressure transmitter, 5, magnetic valve controller, 6, convex closure liquid inlet pipe, 7, feed liquor one-way valve, 8, convex closure drain pipe, 9, fluid one-way valve, 10, ball float, 11, hole, 12, boosting vaporizer, 13, pressure charging valve, 14, pipe fitting, 15, fluid straight tube, 16, 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 for description and interpretation the present invention, is not intended to limit the present invention.
Refer to Fig. 1, a kind of device of avoiding liquid layered in 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 is to change the inside and outside gas pressure difference of convex closure 2 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 being transmitted by pressure transmitter 4 and controls opening or closing of solenoid valve 3 by this electrical signal.Thereby make when the inside and outside gas pressure difference of convex closure 2 is less than setting value, solenoid valve 3 cuts out; When the inside and outside gas pressure difference of convex closure 2 is greater than setting value, solenoid valve 3 is opened, and time delay receives electrical signal again after 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 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 is connected with liquefied natural gas (LNG) tank 1, another input end is connected with convex closure 2, described output terminal is connected 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 convex closure liquid inlet pipe 6, described fluid one-way valve 9 is arranged on convex closure drain pipe 8, by being set, feed liquor one-way valve 7 and fluid one-way valve 9 can guarantee that in storage tank, LNG Liquefied natural gas can only enter convex closure 2 by convex closure liquid inlet pipe 6, the interior LNG Liquefied natural gas of convex closure 2 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 described ball float 10.The setting in this hole 11 can make the interior LNG Liquefied natural gas of convex closure 2 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 one end of described pressure piping is connected with the upper end of liquefied natural gas (LNG) tank 1, and the other end is connected 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, after liquified natural gas heat absorption, change gaseous state into, 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 inner pressure difference that produces of convex closure 2.Described convex closure 2 is funnel shape, thereby the ascensional range that can make 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 liquefied natural gas vaporization causes in convex closure convex closure, is 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 the 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 circular hole and welds mutually with convex closure 2.The upper end mouth of pipe and the distance between convex closure top of described convex closure liquid inlet pipe 6 are 10-20cm, and the convex closure liquid inlet pipe 6 upper end mouths of pipe, near convex closure top, because tank bottom LNG Liquefied natural gas temperature is relatively low, can slow down the interior gas pressure rising of convex closure 2 in part.Described convex closure drain pipe 8 comprises fluid straight tube 15 and the fluid flexible pipe 16 being connected 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 subject to the impact that in storage tank, liquid level changes,
In the liquefied natural gas (LNG) tank avoided in the present invention, the device of liquid layered is by the interior convex closure 2 that arranges of liquefied natural gas (LNG) tank 1, extraneous heat transmission makes the liquefied natural gas vaporization in a part of storage tank, inner and the outside pressure difference that produces of convex closure 2, intermittently the LNG Liquefied natural gas of tank bottom is pressed in convex closure 2 by convex closure liquid inlet pipe 6, by convex closure drain pipe 8, the hole on ball float 10 11 sprays to storage tank top again, thereby LNG Liquefied natural gas in mixing storage tank, avoid generation liquid layered in storage tank, apparatus structure in the present invention is simple, easy to operate, can require to select operation or manual control automatically according to actual motion, there is higher flexibility and Security.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technological scheme that still can record aforementioned each embodiment is modified, or part technical characteristics is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the device that can avoid liquid layered in 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, convex closure liquid inlet pipe, feed liquor one-way valve, convex closure drain pipe, fluid one-way valve and ball float, described convex closure is arranged at the top in liquefied natural gas (LNG) tank, described solenoid valve is installed on convex closure top, described pressure transmitter is provided with two input ends and an output terminal, one of them input end is connected with liquefied natural gas (LNG) tank, another input end is connected with convex closure, described output terminal is connected with magnetic valve controller, described magnetic valve controller is connected with solenoid valve, described feed liquor one-way valve is arranged on convex closure liquid inlet pipe, described fluid one-way valve is arranged on convex closure drain pipe, described ball float is connected in the end of convex closure drain pipe, on described ball float, offer several holes, inner and the outside pressure difference that produces of convex closure.
2. a kind of device of avoiding liquid layered in 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 is connected with the upper end of liquefied natural gas (LNG) tank, and the other end is connected with the lower end of liquefied natural gas (LNG) tank.
3. a kind of device of avoiding liquid layered in liquefied natural gas (LNG) tank as claimed in claim 2, is characterized in that: described convex closure is funnel shape, and described convex closure is fixed on the top in liquefied natural gas (LNG) tank tank by support welding.
4. a kind of device of avoiding liquid layered in liquefied natural gas (LNG) tank as described in claim 1 or 2 or 3, is characterized in that: the bottom of described convex closure offers circular hole, and described convex closure liquid inlet pipe is installed in circular hole and welds mutually with convex closure.
5. a kind of device of avoiding liquid layered in liquefied natural gas (LNG) tank as claimed in claim 4, is characterized in that: the upper end mouth of pipe and the distance between convex closure top of described convex closure liquid inlet pipe are 10-20cm.
6. a kind of device of avoiding liquid layered in liquefied natural gas (LNG) tank as claimed in claim 5, is characterized in that: described convex closure drain pipe comprises fluid straight tube and the fluid flexible pipe being connected with fluid straight tube, and described fluid straight tube is arranged at the side of convex closure bottom.
7. a kind of device of avoiding liquid layered in liquefied natural gas (LNG) tank as claimed in claim 1, 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 liquefied natural gas (LNG) tank as claimed in claim 1, is characterized in that: described ball float density is less than 400kg/m
3.
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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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|---|---|---|---|
| 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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| CN102878425A CN102878425A (en) | 2013-01-16 |
| CN102878425B true 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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| 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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| EP0081012A1 (en) * | 1981-12-02 | 1983-06-15 | Nippon Kokan Kabushiki Kaisha | Method and apparatus for preventing stratification of liquefied gases in a storage tank |
| US5242086A (en) * | 1990-12-17 | 1993-09-07 | The Coca-Cola Company | Liquid container system |
| CN1305073A (en) * | 2001-02-22 | 2001-07-25 | 张玉祥 | Steel cylinder for liquefied petroleum gas |
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