CN215929209U - Saving type liquid nitrogen storage tank - Google Patents
Saving type liquid nitrogen storage tank Download PDFInfo
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- CN215929209U CN215929209U CN202121782916.9U CN202121782916U CN215929209U CN 215929209 U CN215929209 U CN 215929209U CN 202121782916 U CN202121782916 U CN 202121782916U CN 215929209 U CN215929209 U CN 215929209U
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- liquid nitrogen
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- nitrogen
- storage tank
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Abstract
The utility model relates to the technical field of liquid nitrogen storage equipment, in particular to an economical liquid nitrogen storage tank which comprises a liquid nitrogen tank, a diffusing tower, a gasifier and a nitrogen tank, wherein a liquid inlet is formed in the bottom of the liquid nitrogen tank, a full-detection valve is connected to the liquid nitrogen tank, a vent valve is arranged between the liquid nitrogen tank and the diffusing tower, one end of the vent valve is connected with an EAG pipeline, the EAG pipeline is also connected to the gasifier, a liquid nitrogen pipeline is connected between the liquid nitrogen tank and the gasifier, the outlet end of the liquid nitrogen tank is also connected with a BOG pipeline, the other end of the BOG pipeline is connected to an inlet valve of the gasifier, and a nitrogen pipeline is connected between the gasifier and the nitrogen tank. Compared with the prior art, the utility model can directly utilize BOG gas formed by the liquid nitrogen tank while reducing the pressure of the liquid nitrogen tank, thereby reducing the waste.
Description
Technical Field
The utility model relates to the technical field of liquid nitrogen storage equipment, in particular to a saving type liquid nitrogen storage tank.
Background
The nitrogen has the functions of heat preservation of the LNG primary and secondary tanks, replacement and pressure maintaining of a power source of the emergency cut-off valve and station equipment fire maintenance, and the like, and is an essential resource of a natural gas production station.
A liquid nitrogen storage tank and a nitrogen pipe network inlet buffer tank belong to pressure vessels, and the change of the internal pressure of the liquid nitrogen storage tank and the nitrogen pipe network inlet buffer tank needs to be strictly monitored in the using process. As the liquid nitrogen can be evaporated to form BOG in the using process of the storage tank, the pressure of the liquid nitrogen storage tank can continuously rise under the condition of less using amount of the nitrogen. When the liquid nitrogen tank pressure exceeds the control range, and the liquid nitrogen tank liquid level is high, the space is little, when unsatisfied upstream liquid nitrogen unloading condition, can't reduce storage tank pressure through the mode of unloading liquid (the liquid nitrogen dwell time in the storage tank is longer, the temperature is higher, through unloading into low temperature liquid nitrogen, reduce the storage tank internal temperature, because expend with heat and contract with cold principle, storage tank internal pressure can descend), can only carry out the pressure release evacuation to the liquid nitrogen tank that will reach pressure high limit through manual atmospheric valve, keep storage tank pressure in regulation control range. The nitrogen can only be directly discharged into the atmosphere, and cannot be further utilized, so that economic loss is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art and provides an economical liquid nitrogen storage tank.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a saving type liquid nitrogen storage tank, includes the liquid nitrogen container, diffuses tower, vaporizer and nitrogen gas jar, the bottom of liquid nitrogen container is equipped with the inlet, and still be connected with on it and survey full valve, be equipped with the atmospheric valve between liquid nitrogen container and the diffuse tower, one of atmospheric valve is served and is connected with the EAG pipeline, the EAG pipeline still approaches the vaporizer, be connected with the liquid nitrogen pipeline between liquid nitrogen container and the vaporizer, and the exit end of liquid nitrogen container still is connected with the BOG pipeline, the other end of BOG pipeline is connected to the vaporizer inlet valve, be connected with the nitrogen gas pipeline between vaporizer and the nitrogen gas jar.
Preferably, the nitrogen tank is connected with an instrument air system through a nitrogen pipeline.
Preferably, the nitrogen pipeline is also provided with an interlayer pressure detection pipeline before leading to the nitrogen tank.
Compared with the prior art, the utility model has the beneficial effects that:
when BOG retrieves, close vaporizer inlet valve, the liquid nitrogen no longer passes through the drain pipe gasification in the liquid nitrogen cylinder this moment, opens BOG depressurization valve, and the gaseous nitrogen gas jar air feed in supplying station after the vaporizer heating of BOG utilizes the gaseous direct air feed of BOG to reach the purpose of liquid nitrogen jar decompression, gaseous can directly utilize simultaneously, need not discharge and cause the waste.
Drawings
FIG. 1 is a schematic structural diagram of an economical liquid nitrogen storage tank according to the present invention.
In the figure: liquid inlet 1, liquid nitrogen tank 2, full valve 3, vent tower 4, vent valve 5, vaporizer 6, vaporizer inlet valve 61, nitrogen tank 7, liquid nitrogen pipeline 8, BOG pipeline 9, EAG pipeline 10, and nitrogen pipeline 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a saving type liquid nitrogen storage tank, including liquid nitrogen container 2, diffuse tower 4, vaporizer 6 and nitrogen gas jar 7, the bottom of liquid nitrogen container 2 is equipped with inlet 1, and still be connected with on it and survey full valve 3, be equipped with atmospheric valve 5 between liquid nitrogen container 2 and the diffuse tower 4, one of atmospheric valve 5 is served and is connected with EAG pipeline 10, EAG pipeline 10 still approaches vaporizer 6, be connected with liquid nitrogen pipeline 8 between liquid nitrogen container 2 and the vaporizer 6, and the exit end of liquid nitrogen container 2 still is connected with BOG pipeline 9, the other end of BOG pipeline 9 is connected to vaporizer inlet valve 61, be connected with nitrogen gas pipeline 11 between vaporizer 6 and the nitrogen gas jar 7, nitrogen gas jar 7 is connected with instrument wind system behind nitrogen gas pipeline 11, nitrogen gas pipeline 11 still is equipped with the intermediate layer pressure before leading to nitrogen gas jar 7 and detects the pipeline.
Wherein, the normally closed valve and the normally open valve in figure 1 are stop valves.
In this embodiment, on the basis of the overflow valve of the raw liquid nitrogen tank, a BOG pipeline system (i.e., a BOG pipeline 9) is modified and added, and before being connected to the gasifier 6, a shut-off valve (normally closed) is added in the middle of the BOG pipeline 9. When pressure was too high, closed the inlet valve of vaporizer 6, the liquid nitrogen no longer passes through the drain pipe gasification in the liquid nitrogen container 2 this moment, opened BOG depressurization valve, and the BOG gas supplies gas through supplying station internal nitrogen gas tank 7 air feed behind vaporizer 6 heating, both can step down for liquid nitrogen container 2, also reaches the purpose of practicing thrift the cost, avoids extravagant.
Calculating the formula according to the gas: obtaining pV as nrT, and obtaining pV as mrT/M, wherein M is pVM/RT;
when the pressure of the storage tank exceeds the control pressure, the storage tank needs to be discharged, the single pressure discharge pressure is reduced by 50KPa, the pressure difference between the front and the back is 50KPa, and the single discharge amount is calculated by a formula to be about 5 cubic nitrogen under the assumption that the volume temperature in the storage tank is basically kept unchanged. The nitrogen density was 1.25kg/m3The single nitrogen emission is known to be equal to about 6.25kg, based on mass-volume-density. Therefore, when the discharge pressure is 3 times per month, the nitrogen consumption can be saved by 18.75kg per month.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (3)
1. The utility model provides a saving type liquid nitrogen storage tank, includes liquid nitrogen container (2), diffuse tower (4), vaporizer (6) and nitrogen gas jar (7), a serial communication port, the bottom of liquid nitrogen container (2) is equipped with inlet (1), and still be connected with on it and survey full valve (3), be equipped with atmospheric valve (5) between liquid nitrogen container (2) and diffuse tower (4), be connected with EAG pipeline (10) on one of atmospheric valve (5), EAG pipeline (10) still way vaporizer (6), be connected with liquid nitrogen pipeline (8) between liquid nitrogen container (2) and vaporizer (6), and the exit end of liquid nitrogen container (2) still is connected with BOG pipeline (9), the other end of BOG pipeline (9) is connected to vaporizer inlet valve (61), be connected with nitrogen gas pipeline (11) between vaporizer (6) and nitrogen gas jar (7).
2. The economizing liquid nitrogen storage tank according to claim 1, wherein the nitrogen tank (7) is connected to the instrument wind system via a nitrogen pipe (11).
3. The economizing liquid nitrogen storage tank according to claim 1, wherein the nitrogen gas pipe (11) is further provided with a sandwich pressure detection line before leading to the nitrogen gas tank (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121782916.9U CN215929209U (en) | 2021-08-02 | 2021-08-02 | Saving type liquid nitrogen storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121782916.9U CN215929209U (en) | 2021-08-02 | 2021-08-02 | Saving type liquid nitrogen storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215929209U true CN215929209U (en) | 2022-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202121782916.9U Active CN215929209U (en) | 2021-08-02 | 2021-08-02 | Saving type liquid nitrogen storage tank |
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| CN (1) | CN215929209U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659020A (en) * | 2022-03-21 | 2022-06-24 | 烟台杰瑞石油装备技术有限公司 | Liquid nitrogen equipment and control method thereof |
| CN115405854A (en) * | 2022-08-25 | 2022-11-29 | 深圳中广核工程设计有限公司 | Pressure control system and method for liquid nitrogen storage tank and nitrogen distribution pipeline |
-
2021
- 2021-08-02 CN CN202121782916.9U patent/CN215929209U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659020A (en) * | 2022-03-21 | 2022-06-24 | 烟台杰瑞石油装备技术有限公司 | Liquid nitrogen equipment and control method thereof |
| CN114659020B (en) * | 2022-03-21 | 2023-08-25 | 烟台杰瑞石油装备技术有限公司 | Liquid nitrogen equipment and control method thereof |
| CN115405854A (en) * | 2022-08-25 | 2022-11-29 | 深圳中广核工程设计有限公司 | Pressure control system and method for liquid nitrogen storage tank and nitrogen distribution pipeline |
| CN115405854B (en) * | 2022-08-25 | 2024-05-10 | 深圳中广核工程设计有限公司 | System and method for controlling pressure of liquid nitrogen storage tank and nitrogen distribution pipeline |
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