CN211502311U - LNG cryogenic pump pond - Google Patents
LNG cryogenic pump pond Download PDFInfo
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- CN211502311U CN211502311U CN201922372708.0U CN201922372708U CN211502311U CN 211502311 U CN211502311 U CN 211502311U CN 201922372708 U CN201922372708 U CN 201922372708U CN 211502311 U CN211502311 U CN 211502311U
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Abstract
The utility model discloses an LNG low-temperature pump pool, relating to the technical field of LNG gas station equipment; the LNG liquid pump pool comprises a pump pool body and a pump pool cover, wherein a liquid outlet pipe communicated with the pump pool body is connected to the pump pool cover, a discharge port is formed in the bottom of the pump pool body and connected with a downward extending U-shaped bent pipe, one end of the U-shaped bent pipe is communicated with the discharge port, and the other end of the U-shaped bent pipe extends to the outer side of the pump pool body, so that LNG liquid in the pump pool body is discharged from the discharge port in the bottom of the pump pool body; through implementing this technical scheme, can effectively solve current immersed pump pond exhaust mode and have the technical problem that exhaust efficiency is low, can effectively realize that immersed pump bottom of the pool portion is carminative, and solve the pump bottom of the pool portion and exhaust and lead to the BOG bubble to gather the technical problem of the cavitation that causes the immersed pump impeller bottom of the pump pool portion easily, show and improve immersed pump pond exhaust efficiency, save immersed pump maintenance time cost, pump bottom of the pool portion exhaust structure reasonable in design, and safe and reliable, better practicality has in the field practice.
Description
Technical Field
The utility model relates to a LNG gas station equipment technical field especially relates to a LNG cryogenic pump pond.
Background
With the widespread use of LNG (liquefied natural gas), LNG fueling stations are becoming more and more important. A low-temperature liquid pump pool, namely an immersed pump pool in an LNG gas station, can be used in the process of liquefied natural gas infusion, and is key equipment for realizing normal gas filling operation. For example, chinese patent publication No. CN204755231U discloses an LNG pump tank, which includes a pump tank body and a pump tank cover, wherein the pump tank cover is connected to a liquid outlet pipe communicated with the inside of the pump tank body, a horizontal flange is disposed at the upper end of the pump tank body, three through holes transversely penetrating the pump tank body are formed in the flange, and the pump tank cover is fixed to the flange in a sealing manner. In actual operation, the three through holes are used as diffusing ports and are respectively used for overpressure safety diffusion of gas at the top of the pump pool, manual or automatic diffusion of gas at the top of the pump pool and manual diffusion of liquid at the bottom of the pump pool.
However, in the process of implementing the embodiment of the present invention, the inventor of the present invention finds that the above-mentioned conventional immersed pump pool air discharge method has at least the following technical problems: on one hand, when the immersed pump is in operation failure or the immersed pump needs to be periodically checked, the immersed pump pool needs to be opened to take out the immersed pump, liquid and gas in the immersed pump pool need to be discharged before the immersed pump pool is opened, however, LNG liquid is inevitably left in the immersed pump pool, if a mode of exhausting the gas through the top diffusion port of the pump pool is adopted, the LNG liquid needs to be smoothly discharged from the diffusion port after being gasified, the exhaust efficiency of the immersed pump pool is low, and a large amount of overhaul and maintenance time and cost are wasted; on the other hand, the existing immersed pump pool air exhaust mode is adopted, and whether liquid in the immersed pump pool is gasified or not can not be confirmed, so that when the immersed pump pool can be started can not be confirmed, and certain safety risk exists.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem that there is exhaust efficiency low in the current immersed pump pond exhaust mode of above-mentioned, the utility model aims to provide a LNG cryogenic pump pond, its aim at can effectively solve current immersed pump pond exhaust mode only can be by its top exhaust technical difficulty, and consider that LNG liquid is gaseous by the easy production BOG that the immersed pump bottom of the pool portion discharged and absorbing external environment heat in the pump pond, and then lead to the BOG bubble to gather the technical problem of the cavitation that causes the immersed pump impeller bottom the pump pond, discharge the pipeline design into U type return bend with the bottom of the pool, utilize two looks atmoseal and the liquid seal principle of LNG gas-liquid, can effectively solve the cavitation that the pump bottom of the pool heat conduction of exhausting produced BOG bubble and bring, and show improvement immersed pump pond exhaust efficiency, thereby save the immersed pump maintenance time cost.
The utility model adopts the technical scheme as follows:
the utility model provides a LNG cryogenic pump pond, includes pump pond body and pump pond lid be connected with the drain pipe that communicates with the pump pond body on the pump pond lid, the bottom of pump pond body is provided with the discharge port, the discharge port is connected with a downwardly extending's U type return bend, the one end and the discharge port intercommunication of U type return bend, the other end of U type return bend extend to the pump pond body outside to make this internal LNG liquid of pump pond discharge port from its bottom.
Optionally, the pump pool body comprises an inner shell and an outer shell, the inner shell and the outer shell are provided with a vacuum cavity, and the U-shaped elbow is located in the vacuum cavity below the inner shell. So this internal LNG liquid of pump pond gets into in the U type return bend from the discharge port of its bottom and has better thermal-insulated effect with external environment, and the design of U type return bend fully considers and has utilized the gas-liquid two looks air seal and the principle of liquid seal, the liquid storage of U type return bend lower part has the effect of liquid seal to diffusing one side, prevent gas to cross into, and the gas of LNG liquid diffusing one side plays the air seal effect to inside liquid, prevent to continue gasification, can effectively prevent that LNG liquid from producing the cavitation phenomenon that the BOG bubble caused to the immersed pump impeller by immersed pump bottom of the pool heat-conduction of discharging.
Optionally, the U-shaped elbow extends to the outer side of the pump pool body, and one end of the U-shaped elbow extends to the outer side of the pump pool body and is connected with the EAG gasifier. So LNG liquid forms the natural gas that the proportion is less than the air behind the EAG vaporizer, will diffuse easily after the high point diffuses, can effectively improve exhaust efficiency to make the carminative mode of pump sump bottom more reasonable and safe and reliable.
Optionally, one end of the U-shaped bent pipe extending to the outside of the pump pool body is provided with a horizontal pipe communicated with the U-shaped bent pipe.
Optionally, the horizontal pipe is integrally connected with the U-shaped bent pipe.
Optionally, a vacuum tube is arranged on a side wall of the outer shell of the pump pool body, and the vacuum tube is sleeved on the U-shaped bent tube and the horizontal tube and extends along one side of the end of the horizontal tube. So establish the vacuum tube on the discharge pipeline with the discharge port intercommunication, can play fine separation effect to the heat transfer, this U type return bend and vacuum tube section can not produce additional BOG bubble gathering in pump pond bottom basically in the practice process, can effectively prevent the cavitation's that the immersed pump impeller caused phenomenon, pump pond bottom exhaust safe and reliable.
Optionally, a switch valve is arranged on the horizontal pipe. The exhaust of the bottom of the pump pool is controlled, the immersed pump is convenient to periodically check, and the design of the U-shaped bent pipe forms the rapid attenuation of an air side pipeline of an air seal when the exhaust is not performed, and the heat conduction is reduced.
Optionally, one end of the horizontal pipe, which is far away from the U-shaped elbow pipe, is connected with the EAG gasifier. The EAG gasifier can be conveniently installed and connected for exhausting.
Optionally, the middle part of the pump pool body is connected with an air return pipe, and the lower part of the pump pool body is connected with a liquid inlet pipe and an unloading liquid inlet pipe.
Optionally, the feed liquor pipe with the feed liquor pipe of unloading is located same level, the feed liquor pipe of unloading includes the horizontal segment with pump pond body intercommunication and the bending segment that upwards extends along the horizontal segment. The unloading liquid inlet pipe designed in this way has a liquid sealing effect, and can effectively prevent gasified BOG gas at the liquid inlet end of the unloading liquid inlet pipe from entering the pump pool.
As described above, the present invention has at least the following advantages over the prior art:
1. the utility model discloses pump pond exhaust mode adopts and exhausts at pump pond bottom discharge port, and it can effectively solve current immersed pump pond exhaust mode and only can show improvement immersed pump pond exhaust efficiency by its top exhaust's technical difficulty to save the immersed pump maintenance time cost.
2. The utility model discloses take the U type return bend of design and discharge port intercommunication bottom the pump pool, it is gaseous at the thermal easy production BOG of absorption external environment by immersed pump bottom of the pool discharge to have fully considered LNG liquid in the pump pool, and then lead to the BOG bubble to gather the technical problem of the cavitation that causes the immersed pump impeller bottom the pump pool, the usable LNG gas-liquid two alternate atmoseal and the liquid seal principle of design of U type return bend, effectively solve pump pool bottom exhaust heat conduction and produce the cavitation phenomenon that the BOG bubble brought, so that pump pool bottom exhaust is convenient reasonable, and safe and reliable.
3. The utility model discloses the design of U type return bend is in pump pond body bottom vacuum cavity to establish at the discharge line cover and extend the vacuum tube, can play fine separation effect to the heat transfer, this U type return bend and vacuum tube section can not produce additional BOG bubble gathering basically in the pump pond bottom in the practice process, can prevent effectively that the cavitation's that the immersed pump impeller caused phenomenon, further guarantee pump pond bottom exhaust safe and reliable.
4. The utility model discloses a pump pond bottom exhaust mode can effectively release the space of pump pond top exhaust installation pipeline, because there is not other pipe-line erection in week of pump pond lid for whole pump pond pump sledge pipeline overall arrangement is more succinct, does not have too much pipeline interference above its pump pond in the practice operation process, and the operation is very convenient and fast, has better practicality in the field practice.
Drawings
The invention will be described by way of example only and with reference to the accompanying drawings, in which
Fig. 1 is the utility model discloses the structural schematic of LNG cryogenic pump pond.
Description of reference numerals: 10-a pump sump body; 11-an inner housing; 12-an outer shell; 13-vacuum chamber; 14-a discharge port; 20-pump pool cover; 30-a liquid outlet pipe; a 40-U-shaped bent pipe; 41-horizontal pipe; 50-vacuum tube; 60-a switch valve; 70-air return pipe; 80-a liquid inlet pipe; and 90-unloading the liquid inlet pipe.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
The embodiment is basically as shown in figure 1: the embodiment provides an LNG low-temperature pump pond, which is applied to an LNG gas station and comprises a pump pond body 10 and a pump pond cover 20, wherein a liquid outlet pipe 30 communicated with the pump pond body 10 is connected to the pump pond cover 20, a discharge port 14 is arranged at the bottom of the pump pond body 10, the discharge port 14 is connected with a U-shaped bent pipe 40 extending downwards, one end of the U-shaped bent pipe 40 is communicated with the discharge port 14, and the other end of the U-shaped bent pipe 40 extends to the outer side of the pump pond body 10; specifically, the pump chamber body 10 includes an inner casing 11 and an outer casing 12, the inner casing 11 and the outer casing 12 having a vacuum chamber 13, a vacuum nozzle is arranged in the middle of the right side wall of the outer shell 12 of the pump pool body 10 and is used for vacuumizing or detecting the pressure in the vacuum cavity 13, the U-shaped bent pipe 40 is positioned in the vacuum cavity 13 below the inner shell 11, therefore, the LNG liquid in the pump pool body 10 enters the U-shaped bent pipe 40 from the discharge port 14 at the bottom of the pump pool body to have better heat insulation effect with the external environment, and the design of the U-shaped bent pipe 40 fully considers and utilizes the principle of gas seal and liquid seal between gas and liquid phases, the liquid storage at the lower part of the U-shaped bent pipe has the liquid seal function on the diffusing side to prevent gas from entering, the gas at the LNG liquid diffusing side plays a role of gas sealing for the internal liquid to prevent the continuous gasification, the cavitation phenomenon of the BOG bubbles on the impeller of the immersed pump caused by the heat conduction of the LNG liquid discharged from the bottom of the immersed pump pool can be effectively prevented.
The right end of the U-shaped bent pipe 40 extending to the outer side of the pump pool body 10 is connected with an EAG gasifier (not shown), so that LNG liquid forms natural gas with specific gravity smaller than air after passing through the EAG gasifier, the natural gas is easy to diffuse after high point diffusion, the exhaust efficiency can be effectively improved, and the exhaust mode at the bottom of the pump pool is more reasonable, safe and reliable.
In addition, the air return pipe 70 is connected to the left end of the middle of the pump pool body 10, the liquid inlet pipe 80 and the unloading liquid inlet pipe 90 are connected to the lower portion of the pump pool body 10, specifically, the liquid inlet pipe 80 and the unloading liquid inlet pipe 90 are located at the same horizontal height, the unloading liquid inlet pipe 90 comprises a horizontal section communicated with the pump pool body 10 and a bending section extending upwards along the horizontal section, and the unloading liquid inlet pipe 90 designed in the way has a liquid sealing effect and can effectively prevent gasified BOG gas at the liquid inlet end of the unloading liquid inlet pipe 90 from entering the pump pool; in the embodiment of the present invention, the liquid inlet pipe 80, the unloading liquid inlet pipe 90 and the liquid outlet pipe 30 are all configured with corresponding valves.
Example two
The second embodiment is substantially the same as the first embodiment, except that: the cryogenic pump sump of the above embodiment is only a preferred solution, and is not particularly limited thereto, and on the basis, the shape of the pump sump body 10 can be specifically adjusted according to actual needs, for example, the shape of the pump sump body 10 can be various, the overall shape of the pump sump body 10 is preferably cylindrical, and the cylindrical shape has no edges and corners, is not easy to scratch customers, and is easy to process; as another preferred scheme, in this embodiment, a horizontal pipe 41 communicated with the U-bend 40 is disposed at one end of the U-bend 40 extending to the outside of the pump pool body 10, the horizontal pipe 41 may be communicated with the U-bend 40 through a flange or other fixing members, and in this technical scheme, preferably, the horizontal pipe 41 is integrally connected with the U-bend 40, which is beneficial to improving the sealing performance of the whole discharge pipeline, and a person skilled in the art may change the discharge pipeline of the cryogenic pump pool according to different specific situations, so as to ensure the gas sealing performance and the liquid sealing performance between the two gas phases and the liquid phase of the LNG in the pump pool.
As another preferred scheme of this embodiment, a vacuum tube 50 is disposed on the sidewall of the outer shell 12 of the pump pool body 10, the vacuum tube 50 is sleeved on the U-bend 40 and the horizontal tube 41 and extends along one side of the end of the horizontal tube 41, so that the vacuum tube 50 is sleeved on the discharge pipeline communicated with the discharge port 14, which can provide a good blocking effect on heat transfer, in the practical process, the U-bend 40 and the vacuum tube 50 section basically do not generate extra BOG bubbles to gather at the bottom of the pump pool, which can effectively prevent the cavitation caused by the impeller of the immersed pump, and the bottom of the pump pool is safe and reliable to exhaust; and a switch valve 60 is arranged on the horizontal pipe 41 to control the air discharge at the bottom of the pump pool, so that the immersed pump can be periodically checked, and the design of the U-shaped bent pipe 40 can form an air-sealed air side pipeline to quickly attenuate and reduce the heat conduction when the discharge is not performed.
In conclusion, the air exhaust mode of the immersed pump pool in the embodiment adopts the air exhaust at the discharge port 14 at the bottom of the pump pool, so that the technical difficulty that the air exhaust mode of the immersed pump pool can only exhaust air from the top of the immersed pump pool in the prior art can be effectively solved, the air exhaust efficiency of the immersed pump pool can be obviously improved, and the maintenance time cost of the immersed pump is saved; and the inventor of the application fully considers that the LNG liquid in the pump pool is discharged from the bottom of the immersed pump pool to easily generate BOG gas for absorbing the heat of the external environment, and further leads the BOG bubbles to be gathered at the bottom of the pump pool to cause cavitation of an impeller of the immersed pump, the design of the U-shaped bent pipe 40 has the gas sealing and liquid sealing effects between gas and liquid, and the design of the vacuum pipe 50 is matched to basically avoid generating extra BOG bubbles to be gathered at the bottom of the pump pool in the practical process, so that the cavitation phenomenon caused by the impeller of the immersed pump can be effectively prevented, the safety and the reliability of the exhaust at the bottom of the pump pool are ensured, and the practicability is good.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a LNG cryogenic pump pond, includes pump pond body and pump pond lid be connected with the drain pipe that communicates with the pump pond body on the pump pond lid, its characterized in that: the bottom of pump pond body is provided with the discharge port, the discharge port is connected with a U type return bend of downwardly extending, the one end and the discharge port intercommunication of U type return bend, the other end of U type return bend extend to the pump pond body outside to make this internal LNG liquid of pump pond discharge from the discharge port of its bottom.
2. The LNG cryogenic pump pond of claim 1, wherein: the pump pool body comprises an inner shell and an outer shell, the inner shell and the outer shell are provided with a vacuum cavity, and the U-shaped bent pipe is located in the vacuum cavity below the inner shell.
3. LNG cryogenic pump pond according to claim 1 or 2, characterized in that: and one end of the U-shaped bent pipe extending to the outer side of the pump pool body is connected with the EAG gasifier.
4. The LNG cryogenic pump pond of claim 2, wherein: and one end of the U-shaped bent pipe extending to the outer side of the pump pool body is provided with a horizontal pipe communicated with the U-shaped bent pipe.
5. The LNG cryogenic pump pond of claim 4, wherein: the horizontal pipe and the U-shaped bent pipe are integrally connected.
6. The LNG cryogenic pump pond of claim 5, wherein: a vacuum tube is arranged on the side wall of the outer shell of the pump pool body, and the vacuum tube is sleeved on the U-shaped bent tube and the horizontal tube and extends along one side of the end part of the horizontal tube.
7. The LNG cryogenic pump pond of claim 6, wherein: the horizontal pipe is provided with a switch valve.
8. LNG cryogenic pump pond according to any of claims 4-7, characterized in that: and one end of the horizontal pipe, which is far away from the U-shaped bent pipe, is connected with the EAG gasifier.
9. The LNG cryogenic pump pond of claim 1, wherein: the middle part of the pump pool body is connected with an air return pipe, and the lower part of the pump pool body is connected with a liquid inlet pipe and an unloading liquid inlet pipe.
10. The LNG cryogenic pump pond of claim 9, wherein: the liquid inlet pipe with the liquid inlet pipe of unloading is located same level, the liquid inlet pipe of unloading includes the horizontal segment with pump pond body intercommunication and the bending segment that upwards extends along the horizontal segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922372708.0U CN211502311U (en) | 2019-12-25 | 2019-12-25 | LNG cryogenic pump pond |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922372708.0U CN211502311U (en) | 2019-12-25 | 2019-12-25 | LNG cryogenic pump pond |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211502311U true CN211502311U (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922372708.0U Active CN211502311U (en) | 2019-12-25 | 2019-12-25 | LNG cryogenic pump pond |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211502311U (en) |
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2019
- 2019-12-25 CN CN201922372708.0U patent/CN211502311U/en active Active
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Address after: No. 4, workshop 1, floor 1, unit 1, building 1, No. 1888, Checheng West Third Road, Chengdu Economic and Technological Development Zone (Longquanyi District), Sichuan 610000 Patentee after: Youjiete clean energy Co.,Ltd. Address before: Room 101, No.10, No.117, Nansan Road, Chengdu Economic and Technological Development Zone (Longquanyi District), Sichuan 610000 Patentee before: EUP Energy Technology Co.,Ltd. |