CN220523889U - Liquefied natural gas receiving station cryogenic pump cable termination nitrogen supplementing device - Google Patents
Liquefied natural gas receiving station cryogenic pump cable termination nitrogen supplementing device Download PDFInfo
- Publication number
- CN220523889U CN220523889U CN202322319042.9U CN202322319042U CN220523889U CN 220523889 U CN220523889 U CN 220523889U CN 202322319042 U CN202322319042 U CN 202322319042U CN 220523889 U CN220523889 U CN 220523889U
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- CN
- China
- Prior art keywords
- nitrogen
- loop
- valve
- supplementing
- receiving station
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Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 87
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 50
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 18
- 238000010926 purge Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 15
- 238000010408 sweeping Methods 0.000 claims description 4
- 230000000153 supplemental effect Effects 0.000 claims 6
- 239000007789 gas Substances 0.000 abstract description 15
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model provides a cable terminal nitrogen supplementing device of a cryogenic pump of a liquefied natural gas receiving station, which comprises a shell, wherein a nitrogen pipe network access loop, a power end nitrogen supplementing loop, a meter end nitrogen supplementing loop and a purging loop are arranged in the shell, the nitrogen pipe network access loop is communicated with a nitrogen supply pipeline, a filtering pressure reducing valve is arranged on the nitrogen pipe network access loop, the output end of the nitrogen pipe network access loop is respectively communicated with the power end nitrogen supplementing loop, the meter end nitrogen supplementing loop and the purging loop, regulating valve groups are arranged on the power end nitrogen supplementing loop and the meter end nitrogen supplementing loop, and the output end of the purging loop is respectively communicated with the power end nitrogen supplementing loop and the meter end nitrogen supplementing loop. Compared with the prior art, the device has the advantages that the stable control of the nitrogen pressure can be effectively realized, the gas pressure of the whole pipeline is visually detected at any time, the safety of equipment is ensured, the labor intensity of personnel is reduced, and the device is suitable for popularization and use.
Description
Technical Field
The utility model relates to the technical field of nitrogen charging of a cable terminal connector of a cryogenic pump of a liquefied natural gas receiving station, and discloses a supplementary device for providing stable nitrogen for the cable terminal connector of the cryogenic pump.
Background
The cryogenic pump is a cryogenic immersed pump which is arranged at the bottom of the LNG storage tank, and conveys LNG liquid to the tank top and then to other units.
Because of the explosive environment of LNG within the storage tank, the motor cable passes through a double lead termination assembly mounted in series by 2 termination heads. The cavity in the middle of the terminal is kept sealed by an original pipe plug. The nitrogen is adopted to sweep in the middle cavity, and the air pressure fluctuation is monitored, so that the contact with the outside air is realized. Depending on the configuration, a pressure rise in the chamber of around 3Bar, such as the middle, indicates a potential for LNG leakage from the pump end to the terminal, and a pressure drop indicates a potential for nitrogen leakage from the terminal to the outside, neither of which is allowed. At present, the nitrogen is supplemented manually by directly using a single hand valve, which is inconvenient.
Disclosure of Invention
The utility model overcomes the defects in the prior art and provides the nitrogen supplementing device for the cable terminal of the cryogenic pump of the liquefied natural gas receiving station.
The aim of the utility model is achieved by the following technical scheme.
The utility model provides a liquefied natural gas receiving station cryopump cable termination nitrogen gas supplementing device, including the shell, be equipped with nitrogen pipe network access circuit in the shell, power end nitrogen supplementing circuit, instrument end nitrogen supplementing circuit and sweep the return circuit, nitrogen pipe network access circuit is linked together with nitrogen supply pipeline, be equipped with the filtration relief pressure valve on the nitrogen pipe network access circuit, the output of nitrogen pipe network access circuit respectively with power end nitrogen supplementing circuit, instrument end nitrogen supplementing circuit and sweep the return circuit, be equipped with the regulating valve group on power end nitrogen supplementing circuit and the instrument end nitrogen supplementing circuit, the output of sweeping the return circuit is linked together with power end nitrogen supplementing circuit and instrument end nitrogen supplementing circuit respectively.
The power end nitrogen supplementing loop and the instrument end nitrogen supplementing loop are identical in structure, and the loop is sequentially provided with a pressure gauge, an adjustable throttle valve, a manual opening and closing valve and a one-way valve from the input end to the output end.
The manual opening and closing valve is a needle valve.
The two output ends of the purging loop are respectively arranged on the pipeline between the manual valve and the one-way valve on the power end nitrogen supplementing loop and the instrument end nitrogen supplementing loop.
The pipeline of the input end of the nitrogen pipe network access loop is provided with a switch main valve.
The switch main valve is a ball valve.
The purge circuit is provided with a manual valve.
The beneficial effects of the utility model are as follows:
the scheme provides an automatic nitrogen supplementing device, through the pressure reducing device in the control box with the gas that nitrogen pipe network introduced, the medium pressure that admits air falls to required gas pressure size, realizes flow control and monitoring and control flow size and pressure variation in the pipeline, needle shape steerable air feed to satisfy customer's user demand and reduce cost, raise the efficiency.
Compared with the prior art, the device can effectively realize stable control of nitrogen pressure by adopting the operation mode of directly filling nitrogen by manually operating the valve body, and can visually detect the gas pressure of the whole pipeline at any time, thereby ensuring the safety of equipment and reducing the labor intensity of personnel, and being suitable for popularization and use.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure: 1. a housing; 2. the nitrogen pipe network is connected into a loop; 21. a filter pressure reducing valve; 22. a switch main valve; 3. a power end nitrogen supplementing loop; 4. a nitrogen supplementing loop at the instrument end; 5. a purge circuit; 6. a pressure gauge; 7. an adjustable throttle valve; 8. a manual opening and closing valve; 9. a one-way valve.
Detailed Description
The technical scheme of the utility model is further described by specific examples.
Examples
The utility model provides a liquefied natural gas receiving station cryopump cable termination head nitrogen gas supplementing device, including shell 1, be equipped with nitrogen pipe network access circuit 2 in the shell 1, power end nitrogen gas supplementing circuit 3, instrument end nitrogen gas supplementing circuit 4 and sweep circuit 5, nitrogen pipe network access circuit 2 is linked together with the nitrogen gas supply pipeline, be equipped with on the nitrogen pipe network access circuit 2 and filter relief pressure valve 21, the output of nitrogen pipe network access circuit 2 respectively with power end nitrogen supplementing circuit 3, instrument end nitrogen supplementing circuit 4 and sweep circuit 5, be equipped with the regulating valve group on power end nitrogen supplementing circuit 3 and the instrument end nitrogen supplementing circuit 4, the output of sweeping circuit 5 is linked together with power end nitrogen supplementing circuit 3 and instrument end nitrogen supplementing circuit 4 respectively.
The power end nitrogen supplementing loop 3 and the instrument end nitrogen supplementing loop 4 are identical in structure, and the loop is sequentially provided with a pressure gauge 6, an adjustable throttle valve 7, a manual opening and closing valve 8 and a one-way valve 9 from the input end to the output end.
The manual opening and closing valve 8 is a needle valve.
The two output ends of the purging loop 5 are respectively arranged on pipelines between the manual opening and closing valve 8 and the one-way valve 9 on the power end nitrogen supplementing loop 3 and the instrument end nitrogen supplementing loop 4.
The pipeline of the input end of the nitrogen pipe network access loop 2 is provided with a switch master valve 22.
The switch master valve 22 is a ball valve.
The purge circuit 5 is provided with a manual valve 8.
As shown in fig. 1, the working principle of the device is as follows, the shell 1 of the device adopts a control box, each gas loop is arranged in the control box to realize automatic filling of nitrogen, the control box is provided with a gas inlet and a gas outlet, the gas inlet corresponds to the gas inlet end of the nitrogen pipe network access loop 2, and the gas outlet corresponds to the gas outlet ends of the power end nitrogen supplementing loop 3 and the instrument end nitrogen supplementing loop 4 respectively. When the pressure gauge 6 is regularly verified, the purging line 5 is opened, the pressure gauge is put into use after the verification of the pressure gauge is completed, and the purging line 5 is closed.
In this embodiment, the inlet pressure is in the range of 0-20BarR and the outlet pressure is in the range of 0-6 Bar. The high-pressure gas is introduced through the nitrogen pipe network and is connected to the air inlet end of the loop 2, the original impurities are removed by the filtering and pressure reducing valve 21, and the high-pressure gas is output by the output end after being reduced in pressure, so that the air outlet pressure is in the range of 0-6 Bar.
The power end nitrogen supplementing loop 3 and the instrument end nitrogen supplementing loop 4 are identical in structure, and all adopt the pressure gauge 6 to measure pipeline pressure, so that monitoring of nitrogen pressure in a terminal cavity is realized. The adjustable throttle valve 7 is used for adjusting the flow rate of nitrogen in a pipeline, the manual valve 8 is used for controlling the opening and closing of a gas path, and the one-way valve 9 is used for preventing the backflow of gas.
The foregoing describes the embodiments of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.
Claims (7)
1. Liquefied natural gas receiving station cryopump cable termination nitrogen gas supplementing device, its characterized in that: including the shell, be equipped with nitrogen pipe network access circuit, power end nitrogen gas and supply circuit, instrument end nitrogen gas and supply circuit and sweep the return circuit in the shell, nitrogen pipe network access circuit is linked together with nitrogen gas supply pipeline, is equipped with the filtration relief pressure valve on the nitrogen pipe network access circuit, and the output of nitrogen pipe network access circuit is equipped with the regulating valve group on power end nitrogen gas supply circuit, instrument end nitrogen gas supply circuit and the sweeping circuit on power end nitrogen gas supply circuit and the instrument end nitrogen gas supply circuit respectively, and the output of sweeping the return circuit is linked together with power end nitrogen gas supply circuit and instrument end nitrogen gas supply circuit respectively.
2. The lng receiving station cryopump cable termination nitrogen supplemental device of claim 1, wherein: the power end nitrogen supplementing loop and the regulating valve group arranged on the instrument end nitrogen supplementing loop have the same structure, and the loop is sequentially provided with a pressure gauge, an adjustable throttle valve, a manual opening and closing valve and a one-way valve from the input end to the output end.
3. The lng receiving station cryopump cable termination nitrogen supplemental device of claim 2, wherein: the manual opening and closing valve is a needle valve.
4. The lng receiving station cryopump cable termination nitrogen supplemental device of claim 2, wherein: the two output ends of the purging loop are respectively arranged on the pipeline between the manual valve and the one-way valve on the power end nitrogen supplementing loop and the instrument end nitrogen supplementing loop.
5. The lng receiving station cryopump cable termination nitrogen supplemental device of claim 1, wherein: and a pipeline of the input end of the nitrogen pipe network access loop is provided with a switch main valve.
6. The lng receiving station cryopump cable termination nitrogen supplemental device of claim 5, wherein: the switch main valve is a ball valve.
7. The lng receiving station cryopump cable termination nitrogen supplemental device of claim 1, wherein: a manual opening and closing valve is arranged on the purging loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322319042.9U CN220523889U (en) | 2023-08-29 | 2023-08-29 | Liquefied natural gas receiving station cryogenic pump cable termination nitrogen supplementing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322319042.9U CN220523889U (en) | 2023-08-29 | 2023-08-29 | Liquefied natural gas receiving station cryogenic pump cable termination nitrogen supplementing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220523889U true CN220523889U (en) | 2024-02-23 |
Family
ID=89939294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322319042.9U Active CN220523889U (en) | 2023-08-29 | 2023-08-29 | Liquefied natural gas receiving station cryogenic pump cable termination nitrogen supplementing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220523889U (en) |
-
2023
- 2023-08-29 CN CN202322319042.9U patent/CN220523889U/en active Active
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| GR01 | Patent grant |