CN105042329A - Double-layer type LNG pump well structure and storage tank comprising structure - Google Patents

Double-layer type LNG pump well structure and storage tank comprising structure Download PDF

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Publication number
CN105042329A
CN105042329A CN201510529163.3A CN201510529163A CN105042329A CN 105042329 A CN105042329 A CN 105042329A CN 201510529163 A CN201510529163 A CN 201510529163A CN 105042329 A CN105042329 A CN 105042329A
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China
Prior art keywords
pump
well
storage tank
lng
double layer
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CN201510529163.3A
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CN105042329B (en
Inventor
江涛
李凡
吴卫东
林晓辉
郑跃华
杨孟超
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Houpu clean energy Co., Ltd
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CHENGDU HUAQI HOUPU ELECTROMECHANICAL EQUIPMENT Co Ltd
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Abstract

The invention discloses a double-layer type LNG pump well structure, and belongs to the field of LNG pump wells. The LNG pump well structure comprises a pump well internally provided with an immersed pump. The pump well comprises an inner well and an outer well. An interlayer is formed between the inner well and the outer well. A liquid inlet cavity is formed by the inner well and the liquid inlet end of the immersed pump. The inner well is provided with a plurality of pipelines penetrating out of the outer well. The pipelines are connected with the liquid inlet cavity. The pipelines are provided with a plurality of stop valves located in the interlayer. The double-layer type LNG pump well structure has the beneficial effects that the structure is simple, and implementation and installation are easy and convenient; the immersed pump can be maintained at any time, and valves controlling communication between the storage tank and the pump well can be maintained at any time; and LNG waste is greatly reduced, and there is no threat to the safety of maintenance personnel.

Description

Double layer LNG pump well construction and the storage tank containing its structure
Technical field
The present invention relates to a kind of pump sump structure, particularly a kind of double layer LNG pump well construction.
Background technique
Large-scale LNG storage tank generally build underground in, and storage tank is higher than liquid level with the connection part of outside pipeline.For this storage tank, outwards during conveying LNG, immersed pump must be adopted.Immersed pump is arranged on the bottom of storage tank usually, and for the ease of maintenance pump, prior art is for each pump arranges a vertical tube, is referred to as " pump sump ".Immersed pump is arranged on the bottom of pump sump, and storage tank and pump sump are separated by one, bottom valve, are referred to as " bottom valve ".The base of pump is positioned at above bottom valve, and when pump is installed to after on base, rely on the Action of Gravity Field of pump by valve open, pump sump is communicated with LNG storage tank.If by pump take out maintenance, valve just loses pump Action of Gravity Field, in the active force and storage tank of spring static pressure acting in conjunction under, make valve closing, serve the effect isolated in storage tank space and pump sump space.
Although the design of prior art is convenient, immersed pump is keeped in repair, but when bottom valve fault, mention immersed pump and also cannot close being communicated with of storage tank and pump sump, on-call maintenance cannot be carried out to immersed pump, if be only provided with a pump in storage tank, so just can only be emptying by the LNG in storage tank, cause the waste of a large amount of LNG; Bottom valve also cannot carry out maintain and replace at any time; When keeping in repair bottom valve, maintenance man needs to be deep into pump sump inside, not only inconvenient but also larger to the security presence of maintenance man threat.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, provides a kind of structure simple, implements simple installation; Can not only keep in repair immersed pump at any time, also can keep in repair with the valve be communicated with between pump sump control storage tank at any time; Significantly reduce LNG waste, to maintenance man's safety without the pump sump structure threatened.
The technical solution used in the present invention is as follows:
Double layer LNG pump well construction, establishes the pump sump of immersed pump in comprising, described pump sump comprises Nei Jing and Wai Jing, forms interlayer between described Nei Jing and outer well, and the liquid feeding end of described interior well and immersed pump forms admission chamber; Described interior well is provided with some pipelines passing outer well, and described pipeline connects admission chamber, and described pipeline is provided with some stop valves, and described stop valve is positioned at interlayer.
Owing to have employed said structure, control pump sump and move on to storage tank outside with the stop valve be communicated with between storage tank, when needs keep in repair immersed pump, close stop valve from outside and namely can disconnect being communicated with between pump sump with storage tank, now immersed pump is hung out well and can keep in repair immersed pump outward; Pump sump structure is simple, implements simply easy for installation, has the possibility that extremely strong practicability also reduces to cause operator security incident.
Double layer LNG pump well construction, be sealing configuration bottom described pump sump, described interior bottom is sealing configuration.
Owing to have employed said structure, what ensure that between pump sump and storage tank is isolated, avoid LNG from storage tank to pump sump seepage, reduce the waste of LNG.
Double layer LNG pump well construction, described stop valve comprises valve body and spool, is provided with spool in described valve body, and the valve rod that described spool and spool connect leads to pump sump top.
Owing to have employed said structure, the valve gap and the valve rod that control pump sump and the stop valve be communicated with between storage tank have extended to pump sump top, stop valve can operate from pump sump top, when needs keep in repair immersed pump, maintenance man is without the need at the bottom of lower going-into-well, namely being communicated with between pump sump with hydrops pond can be disconnected from the valve rod of peripheral operation stop valve, now immersed pump is hung out well to keep in repair immersed pump outward, pump sump structure is simple simultaneously, implement simply easy for installation, there is extremely strong practicability; Stop valve spool can be changed from top when stop valve needs repairing time, without the need to going deep into pump sump inside, convenient for maintaining, ensure that the safety of maintenance man.
Double layer LNG pump well construction, described interlayer top is sealing configuration, and described interlayer inside fills inert gas or is vacuum.
Owing to have employed said structure, inert gas has and stable not easily to react, the relative molecular mass being greater than air with relative molecular mass is greater than the physical property of the average molecular mass of air, normal pressure inert gas is filled between the interlayer that inwall and outer wall are formed, gas blanket can be formed in the middle of interlayer, a small amount of LNG can not only be prevented to be leaked in air environment, the safety of personnel is caused a hidden trouble, the steam in air can also be stoped, dust or particle etc. impact stop valve, reduce the possibility that stop valve stop valve breaks down, reduce maintenance frequency, add the life-span of stop valve, save cost, or pump sump is vacuum state, also can realize preventing a small amount of LNG to be leaked in air environment, the safety of personnel is caused a hidden trouble, the steam in air, dust or particle etc. can also be stoped to impact stop valve, reduce the possibility that stop valve stop valve breaks down.
Double layer LNG pump well construction, described pipeline is made up of stainless steel.
Owing to have employed said structure, extend the working life of pipeline, also ensure that from hydrops pond conveying LNG stablizing to pump sump.
A storage tank containing double layer LNG pump well construction, comprise above-mentioned double layer LNG pump well construction and storage tank, described pump sump is arranged at tank inside .
Owing to have employed said structure, double layer LNG pump well can be placed in tank inside, and storage tank provides cryogenic temperature to pump sump, makes LNG in pump sump can not pneumatolytic metamorphism, and pump sump does not need to arrange separately the device, energy saving and the cost that keep constant temperature.Double layer LNG pump well construction is inserted in storage tank, also eliminates the setting of bottom valve in prior art, avoids when bottom valve fault, mentions immersed pump and also cannot close being communicated with of storage tank and pump sump, cannot carry out on-call maintenance, cause the waste of a large amount of LNG to immersed pump; It also avoid bottom valve and also cannot carry out maintain and replace at any time, the LNG in storage tank such as to only have use and just can to keep in repair afterwards, and the situation that a large amount of LNG also can be caused during this to waste occurs; Can not cause when keeping in repair bottom valve, maintenance man needs to be deep into pump sump inside, threat this problem larger to the security presence of maintenance man simultaneously.
A storage tank containing double layer LNG pump well construction, described tank bottom is provided with hydrops hole, and extend in hydrops hole bottom described pump sump, described pipeline passes interlayer and extends in hydrops hole.
Owing to have employed said structure, due to gravity, be LNG liquid in the hydrops hole of tank bottom, pump sump stretches in hydrops hole and ensures that temperature remains constant, and fluctuating range is minimum; Pipeline is connected to hydrops hole, ensure that the liquid entering pump sump in storage tank is LNG, and the BOG that storage tank upper strata can not be caused to exist sucks, and stretches in hydrops hole simultaneously, reduces the pipe range needed for connecting tube, save material bottom pump sump.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, structure is simple, implements simple installation, can not only keep in repair immersed pump at any time, also can keep in repair with the valve be communicated with between pump sump control storage tank at any time.
2, significantly reduce the waste to LNG in maintenance process and working procedure, reduce energy loss, saved cost.
3, at any time maintaining is carried out to stop valve, reduce the possibility that stop valve breaks down, increase device security, decrease maintenance expenses and maintain frequently, additionally providing the working environment of clean and safe.
Accompanying drawing explanation
Fig. 1 is the structural representation of double layer LNG pump well construction and the storage tank containing its structure.
Mark in figure: 1 is pump sump, and 11 is interior well, and 12 is outer well, and 13 is interlayer, and 2 is storage tank, 21 is hydrops hole, and 3 is stop valve, and 4 is pipeline, and 5 is admission chamber.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment 1
As shown in Figure 1, double layer LNG pump well construction, establishes the pump sump 1 of immersed pump in comprising, and it is outside that pump sump 1 can be placed in storage tank 2, also can be placed in storage tank 2 inner; Pump sump 1 comprises interior well 11 and outer well 12, and it is outside that outer well 12 is placed in interior well 11, forms interlayer 13 between interior well 11 and outer well 12, and interior well 11 forms admission chamber 5 with the liquid feeding end of immersed pump; Interior well 11 is provided with some pipelines 4 passing outer well 12, and one end of pipeline 4 connects admission chamber 5, and the other end of pipeline 4 is liquid feeding end; Pipeline 4 is provided with some stop valves 3, and the number of stop valve 3 can be 1, also can be 2, and even more, stop valve 3 is positioned at interlayer 13.When needs keep in repair immersed pump, close stop valve from outside and namely can disconnect being communicated with between pump sump with storage tank, now immersed pump is hung out well and can keep in repair immersed pump outward; Pump sump structure is simple, implements simply easy for installation, has the possibility that extremely strong practicability also reduces to cause operator security incident.This pump sump structure can be arranged on tank inside, also can be arranged on storage tank outside, and same structure has adaptability widely, can carry out unrestricted choice according to actual needs.
Interior well 11 is provided with two extendthe pipeline 4 that direction is contrary, a pipeline 4 connects admission chamber 5 and passes outer well 11, be connected in storage tank, another root pipeline 4 connects admission chamber 5 in the opposite direction and passes outer well 11, be connected in storage tank, each root pipeline 4 is provided with a stop valve 3, when one of them stop valve breaks down time, close another stop valve, namely can the stop valve broken down be keeped in repair.Avoid after stop valve breaks down, being communicated with thus cannot keeping in repair stop valve between pump sump with hydrops pond cannot be cut off, the situation causing a large amount of LNG to waste occurs, also facilitate maintenance man to keep in repair, maintaining can also be carried out at any time to stop valve, reduce the possibility that stop valve breaks down; Pipeline 4 is made up of stainless steel.
Embodiment 2
As shown in Figure 1, double layer LNG pump well construction is sealing configuration bottom pump sump 1, is sealing configuration bottom interior well 11.Pipeline 4 can connect admission chamber 5 from the sidewall of interior well 11, also admission chamber 5 can be connected from bottom, but be sealing configuration bottom interior well 11, it is also sealing configuration bottom pump sump 1, when pump sump structure is positioned at tank inside, what ensure that between pump sump and storage tank is isolated, avoid LNG from storage tank to pump sump seepage, reduce the waste of LNG; When pump sump structure be positioned at storage tank outside time, avoid LNG from pump sump to External leakage, reduce the waste of LNG, also reduce the potential safety hazard of leaking and may cause.
Embodiment 3
As shown in Figure 1, double layer LNG pump well construction, stop valve 3 comprises valve body and spool, spool is provided with in valve body, the valve rod that spool and spool connect leads to pump sump 1 top, stop valve 3 can operate from pump sump top, when needs keep in repair immersed pump, maintenance man is without the need at the bottom of lower going-into-well, namely can disconnect being communicated with between pump sump with hydrops pond from the valve handle of peripheral operation stop valve, now immersed pump be hung out well and can keep in repair immersed pump outward, pump sump structure is simple simultaneously, implement simply easy for installation, there is extremely strong practicability; Stop valve spool can be changed from top when stop valve needs repairing time, without the need to going deep into pump sump inside, convenient for maintaining, ensure that the safety of maintenance man.
Embodiment 4
As shown in Figure 1, double layer LNG pump well construction, interlayer 13 top is sealing configuration, interlayer 13 inside fills inert gas, inert gas has and stable not easily to react, the relative molecular mass being greater than air with relative molecular mass is greater than the physical property of the average molecular mass of air, normal pressure inert gas is filled between the interlayer that inwall and outer wall are formed, gas blanket can be formed in the middle of interlayer, a small amount of LNG can not only be prevented to be leaked in air environment, the safety of personnel is caused a hidden trouble, the steam in air can also be stoped, dust or particle etc. impact stop valve, reduce the possibility that stop valve stop valve breaks down, reduce maintenance frequency, add the life-span of stop valve, save cost, inert gas can adopt nitrogen etc., or pump sump is vacuum state, also can realize preventing a small amount of LNG to be leaked in air environment, the safety of personnel is caused a hidden trouble, the steam in air, dust or particle etc. can also be stoped to impact stop valve, reduce the possibility that stop valve stop valve breaks down, adopt the conventional meanses well known by persons skilled in the art such as pearlife all can realize this purpose simultaneously.
Embodiment 5
As shown in Figure 1, a kind of storage tank containing double layer LNG pump well construction, comprises above-mentioned double layer LNG pump well construction and storage tank 2, and it is inner that pump sump 1 is arranged at storage tank 1 ,storage tank 2 provides cryogenic temperature to pump sump 1, makes LNG in pump sump 1 can not pneumatolytic metamorphism, and pump sump 1 does not need to arrange separately the device, energy saving and the cost that keep constant temperature.Be provided with hydrops hole 21 bottom storage tank 2, extend in hydrops hole 21 bottom pump sump 1, pipeline 4 passes interlayer 13 and extends in hydrops hole 21, due to the reason of gravity, hydrops 21 bottom storage tank 2 is LNG liquid in cheating, and pump sump 1 stretches in hydrops hole 21 and ensures that temperature remains constant, and fluctuating range is minimum; Pipeline 4 is connected to hydrops hole 21, ensure that the liquid entering pump sump 1 in storage tank is LNG, and the BOG that storage tank 2 upper strata can not be caused to exist sucks, and stretches in hydrops hole simultaneously, reduces the pipe range needed for connecting tube 4, save material bottom pump sump 1.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. double layer LNG pump well construction, it is characterized in that: the pump sump (1) establishing immersed pump in comprising, described pump sump (1) comprises interior well (11) and outer well (12), form interlayer (13) between described interior well (11) and outer well (12), described interior well (11) forms admission chamber (5) with the liquid feeding end of immersed pump; Described interior well (11) is provided with some pipelines (4) passing outer well (12), and described pipeline (4) connects admission chamber (5), and described pipeline (4) is provided with some stop valves (3), and described stop valve (3) is positioned at interlayer (13).
2. double layer LNG pump well construction as claimed in claim 1, is characterized in that: described pump sump (1) bottom is sealing configuration, and described interior well (11) bottom is sealing configuration.
3. double layer LNG pump well construction as claimed in claim 1, is characterized in that: described stop valve (3) comprises valve body and spool, is provided with spool in described valve body, and the valve rod that described spool and spool connect leads to pump sump (1) top.
4. double layer LNG pump well construction as claimed in claim 1, is characterized in that: described interlayer (13) top is sealing configuration, and described interlayer (13) inside fills inert gas or is vacuum.
5. as the double layer LNG pump well construction in claim 1-4 as described in any one claim, it is characterized in that: described pipeline (4) is made up of stainless steel.
6. the storage tank containing double layer LNG pump well construction, is characterized in that: comprise above-mentioned double layer LNG pump well construction and storage tank (2), and it is inner that described pump sump (1) is arranged at storage tank (2), and described pipeline (4) is communicated with in storage tank (2) .
7. a kind of storage tank containing double layer LNG pump well construction as claimed in claim 6, it is characterized in that: described storage tank (2) bottom is provided with hydrops hole (21), described pump sump (1) bottom extends in hydrops hole (21), and described pipeline (4) passes interlayer (13) and extends in hydrops hole (21).
CN201510529163.3A 2015-08-26 2015-08-26 Two-layer equation LNG pump well construction and the storage tank containing its structure Active CN105042329B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56120896A (en) * 1980-02-25 1981-09-22 Kawasaki Heavy Ind Ltd Pump barrel support device for double shell low temperature tank
CN202483903U (en) * 2012-02-28 2012-10-10 浙江机电职业技术学院 Liquefied natural gas (LNG) immersed pump
CN202629586U (en) * 2012-03-30 2012-12-26 查特深冷工程系统(常州)有限公司 Box type gas filling device for liquefied natural gas
CN203718368U (en) * 2014-02-19 2014-07-16 中船圣汇装备有限公司 Low-temperature storage tank and vacuum immersed pump system
CN203743819U (en) * 2014-01-13 2014-07-30 查特深冷工程系统(常州)有限公司 Underground storage tank for LNG (Liquefied Natural Gas) filling station
CN104235594A (en) * 2013-06-13 2014-12-24 张家港中集圣达因低温装备有限公司 Horizontal double-layer buried storage tank
CN204879435U (en) * 2015-08-26 2015-12-16 成都华气厚普机电设备股份有限公司 Two -layer equation LNG pump well structure and contain storage tank of its structure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56120896A (en) * 1980-02-25 1981-09-22 Kawasaki Heavy Ind Ltd Pump barrel support device for double shell low temperature tank
CN202483903U (en) * 2012-02-28 2012-10-10 浙江机电职业技术学院 Liquefied natural gas (LNG) immersed pump
CN202629586U (en) * 2012-03-30 2012-12-26 查特深冷工程系统(常州)有限公司 Box type gas filling device for liquefied natural gas
CN104235594A (en) * 2013-06-13 2014-12-24 张家港中集圣达因低温装备有限公司 Horizontal double-layer buried storage tank
CN203743819U (en) * 2014-01-13 2014-07-30 查特深冷工程系统(常州)有限公司 Underground storage tank for LNG (Liquefied Natural Gas) filling station
CN203718368U (en) * 2014-02-19 2014-07-16 中船圣汇装备有限公司 Low-temperature storage tank and vacuum immersed pump system
CN204879435U (en) * 2015-08-26 2015-12-16 成都华气厚普机电设备股份有限公司 Two -layer equation LNG pump well structure and contain storage tank of its structure

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Address after: 610041 No.3, floor 11, building 6, no.599, shijicheng South Road, Chengdu high tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu City, Sichuan Province

Patentee after: Houpu clean energy Co., Ltd

Address before: 610041 D, Tianfu Software Park, 216 century South Road, Chengdu hi tech Zone, Sichuan, China

Patentee before: Chengdu Huaqi Houpu Electromechanical Equipment Co., Ltd.