CN216520898U - Large-scale direct-feed high-purity nitrogen residual gas storage tank - Google Patents

Large-scale direct-feed high-purity nitrogen residual gas storage tank Download PDF

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CN216520898U
CN216520898U CN202122584489.XU CN202122584489U CN216520898U CN 216520898 U CN216520898 U CN 216520898U CN 202122584489 U CN202122584489 U CN 202122584489U CN 216520898 U CN216520898 U CN 216520898U
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nitrogen
residual
storage tank
liquid
tank
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王战虎
曹文磊
王鹏年
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Yude Gas Co ltd
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Yude Gas Co ltd
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Abstract

The utility model discloses a large direct-supply high-purity nitrogen residual gas storage tank, and belongs to the technical field of liquid nitrogen storage. The residual gas storage tank comprises a liquid nitrogen storage tank, a residual nitrogen tank, a liquid nitrogen input pipe and a liquid nitrogen output pipe, wherein the liquid nitrogen storage tank is provided with a first nitrogen inlet, a first nitrogen outlet, a first liquid outlet and a first pressure relief opening; the residual nitrogen tank is provided with a nitrogen inlet II, a nitrogen outlet II, a liquid outlet II and a pressure relief opening II, the nitrogen inlet II is connected with the pressure relief opening I through a residual nitrogen input pipe, the residual nitrogen input pipe is provided with a compressor, and the nitrogen outlet II is connected with a liquid nitrogen input pipe through a residual nitrogen output pipe; and the residual nitrogen output pipe and the residual nitrogen input pipe are both vacuum jacket pipes, and corrugated compensation pipes are arranged in inner pipes of the nitrogen output pipe and the residual nitrogen input pipe. The utility model can solve the waste of high-purity nitrogen under the pressure relief in the tank area by only using the residual nitrogen tank with small volume, saves the energy consumption of the vaporizer, achieves two purposes by one stroke and greatly saves the production cost.

Description

Large-scale direct-feed high-purity nitrogen residual gas storage tank
Technical Field
The utility model belongs to the technical field of liquid nitrogen storage, and particularly relates to a large direct-supply high-purity nitrogen residual gas storage tank.
Background
The gas processing enterprise separates the gas after the separation through the air, and the high-purity oxygen of direct supply and high-purity nitrogen gas are carried to the relevant workshop of steel mill through the pipeline after main heat exchanger liquefaction and follow-up reheat, but partial residual gas need not to gasify direct liquefaction storage, and high-purity liquid nitrogen nature is stable, except vibrations striking, generally does not have the storage danger, so is very common in the tank field of gas enterprise.
The liquid nitrogen tank is generally of a two-layer vacuum structure, pipelines, valves, instruments and the like are arranged at the upper part or the bottom part according to needs, and the pressure relief device is most concerned in production because the pressure relief and the collision prevention of the liquid nitrogen storage tank are important matters about safe production.
The pressure relief devices in the prior art are all automatically configured, and although various prevention and supporting equipment are provided, the icing of a pressure relief opening channel is still quite common; after the tank body is used for a long time, when the vacuum degree is reduced and the heat preservation effect is poor, more pressure relief gas is discharged; the high-purity nitrogen decompressed by the pressure is decompressed into the air, so that waste exists, if a vaporizer is equipped, the energy consumption is increased, and two factors of residual gas leakage and vaporizer energy consumption are factors capable of saving the production cost.
The number of storage tanks in the tank area is large, the pressure relief noise is large, the pressure relief state of one storage tank cannot be distinguished, and the inspection needs to be performed close to each storage tank; tank trucks are charged to and from the tank farm, and potential collision risks exist when the tank farm is erected on the ground.
Based on the background technology, production personnel provide a large direct supply high-purity nitrogen residual gas storage tank.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a large direct-supply high-purity nitrogen and residual gas storage tank, which aims to solve the problems that the pressure relief gas of a liquid nitrogen storage tank is wasted, the energy consumption of a matched vaporizer is high, and the production cost is influenced.
In order to solve the problems, the technical scheme of the utility model is as follows:
a large-scale direct-supply high-purity nitrogen and residual gas storage tank comprises a liquid nitrogen storage tank, a residual nitrogen tank, a liquid nitrogen input pipe and a liquid nitrogen output pipe, wherein the liquid nitrogen storage tank is provided with a first nitrogen inlet, a first nitrogen outlet, a first liquid outlet and a first pressure relief port; the residual nitrogen tank is provided with a nitrogen inlet II, a nitrogen outlet II, a liquid outlet II and a pressure relief opening II, the nitrogen inlet II is connected with the pressure relief opening I through a residual nitrogen input pipe, the residual nitrogen input pipe is provided with a compressor, and the nitrogen outlet II is connected with a liquid nitrogen input pipe through a residual nitrogen output pipe; and the residual nitrogen output pipe and the residual nitrogen input pipe are both vacuum jacket pipes, and corrugated compensation pipes are arranged in inner pipes of the residual nitrogen output pipe and the residual nitrogen input pipe.
Furthermore, the number of the liquid nitrogen storage tanks is at least, the first nitrogen outlet of each liquid nitrogen storage tank is connected to the liquid nitrogen output pipe, and the first nitrogen inlet of each liquid nitrogen storage tank is connected to the liquid nitrogen input pipe.
Furthermore, a vacuum cavity is arranged between the inner wall and the outer wall of the residual nitrogen tank, and a liquid level meter is arranged on the upper part of the inner wall.
Furthermore, a solenoid valve is arranged on the residual nitrogen output pipe, and a PLC is arranged between the solenoid valve and the liquid level meter.
Further, the lower part is established in cement protective structure in the liquid nitrogen storage tank, and liquid nitrogen storage tank upper portion is established at cement protective structure top, and surplus nitrogen jar is established at cement protective structure top, and cement protective structure's lower part 1/3 is established below ground.
Furthermore, a flow meter is arranged on the residual nitrogen input pipe, and the flow meter is connected with an alarm.
Further, a vaporizer is arranged on a pipeline of the second pressure relief opening.
The utility model has the following beneficial effects:
(1) according to the utility model, gas-liquid mixed nitrogen discharged from the pressure relief port of the liquid nitrogen storage tank is introduced into the small compressor through the residual nitrogen input pipe to be liquefied and collected in the residual nitrogen tank again, and the residual nitrogen tank is connected into the liquid nitrogen input pipe through the residual nitrogen output pipe when being collected sufficiently, so that the effect of entering the liquid nitrogen storage loop is realized, thus residual nitrogen in all tank areas can be collected, vaporizers on pressure relief pipelines of all original liquid nitrogen storage tanks can be saved, on one hand, waste is avoided by collecting high-purity nitrogen, and on the other hand, energy consumption is greatly reduced after a plurality of vaporizers on the pressure relief pipelines of the liquid nitrogen storage tanks are disassembled. The residual nitrogen output pipe and the residual nitrogen input pipe use the vacuum jacket pipe to ensure that the heat insulation is as far as possible in the conveying process, the inner pipe of the vacuum jacket pipe is in contact with liquid nitrogen, and the outer pipe is exposed in the air, so the cold shrinkage of the whole pipeline needs to be compensated by installing the corrugated compensation pipe in the inner pipe.
(2) A plurality of liquid nitrogen storage tanks in the tank area are connected and automatically shut down through pipelines; the vacuum cavity of the residual nitrogen tank is convenient for heat insulation as much as possible when collecting and storing the residual nitrogen; the liquid level meter, the electromagnetic valve and the PLC realize the automatic shutdown of the conveying of the residual nitrogen in the residual nitrogen tank to the liquid nitrogen storage tank; the liquid nitrogen storage tanks are arranged in a cement protection structure on the half ground, only the top is exposed, the cement structure is convenient for climbing, no ladder stand is required to be arranged separately for overhauling the liquid nitrogen storage tank instrument pipeline arranged on the cement structure, the safety is high, the residual nitrogen tank can be erected on the residual nitrogen tank, whether the pressure relief operation is normal or not is convenient to listen, the cost of the cement protection structure is low, and the possibility of tank car collision can be completely avoided; the design of the flowmeter on the residual nitrogen input pipe is to identify the vacuum state of the liquid nitrogen storage tank, when the flow is suddenly increased, the increase of the leaked nitrogen is indicated, which means that the vacuum heat insulation state of a certain liquid nitrogen storage tank needs to be overhauled in time; the vaporizer of the second pressure relief opening prevents the residual nitrogen tank from freezing when the pressure is relieved.
(3) The waste of high-purity nitrogen discharged from the tank area can be solved by using the residual nitrogen tank with small volume, the energy consumption of the vaporizer is saved, two purposes are achieved by one stroke, and the production cost is greatly saved; the cement protective structure has a good anti-collision effect, the top of the tank body is convenient to overhaul, the residual nitrogen tank is just mounted, the pressure relief state of the tank body is visible at any time when a worker passes through the tank region, and the safety is higher without influence of other sounds.
Drawings
FIG. 1 is a schematic structural diagram of a large direct-supply high-purity nitrogen residual gas storage tank;
FIG. 2 is a schematic structural diagram of a liquid nitrogen overflow tank in a large direct-supply high-purity nitrogen residual gas storage tank.
The reference numbers are as follows: 1-a liquid nitrogen storage tank; 11-nitrogen inlet I; 12-a nitrogen outlet I; 13-liquid discharge port I; 14-a first pressure relief opening;
2-residual nitrogen tank; 21-nitrogen inlet II; 22-nitrogen outlet II; 23-a second liquid discharge port; 24-a second pressure relief opening; 25-vacuum chamber; 27-an outer wall; 26-inner wall; 28-a vaporizer; 29-a level gauge;
3-a cement protective structure; 4-the ground; 5-liquid nitrogen input pipe; 6-liquid nitrogen output pipe; 7-residual nitrogen output pipe; 71-a solenoid valve; 72-PLC; 8-a compressor; 9-residual nitrogen input pipe; 91-a flow meter; 92-an alarm; 10-corrugated compensation pipe.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As shown in fig. 1-2, a large-scale direct-supply high-purity nitrogen residual gas storage tank comprises liquid nitrogen storage tanks 1 and residual nitrogen tanks 2, wherein the number of the liquid nitrogen storage tanks 1 is 2 in the figure, a plurality of liquid nitrogen storage tanks are arranged in the production process, and each liquid nitrogen storage tank 1 is provided with a first nitrogen inlet 11, a first nitrogen outlet 12, a first liquid discharge outlet 13 and a first pressure relief outlet 14; the first nitrogen outlet 12 of each liquid nitrogen storage tank 1 is connected to the liquid nitrogen output pipe 6, and the first nitrogen inlet 11 of each liquid nitrogen storage tank 1 is connected to the liquid nitrogen input pipe 5.
The residual nitrogen tank 2 is provided with a second nitrogen inlet 21, a second nitrogen outlet 22, a second liquid outlet 23 and a second pressure relief port 24. A carburetor 28 is arranged on the pipeline of the second pressure relief opening 24; the second nitrogen inlet 21 is connected with the first pressure relief ports 14 through a plurality of residual nitrogen input pipes 9, and a compressor 8 is arranged on a main pipe of the residual nitrogen input pipes 9; a flow meter 91 is arranged on the residual nitrogen input pipe 9, the flow meter 91 is connected with an alarm 92, and the second nitrogen outlet 22 is connected with the liquid nitrogen input pipe 5 through a residual nitrogen output pipe 7; connecting pipes between the residual nitrogen output pipe 7, the residual nitrogen input pipe 9, the second pressure relief opening 24 and the vaporizer 28 are all vacuum jacketed pipes, and corrugated compensation pipes 10 are arranged in inner pipes of the vacuum jacketed pipes.
A vacuum cavity 25 is arranged between the inner wall 26 and the outer wall 27 of the residual nitrogen tank 2, and a liquid level meter 29 is arranged at the upper part of the inner wall 26. An electromagnetic valve 71 is arranged on the residual nitrogen output pipe 7, and a PLC is arranged between the electromagnetic valve 71 and the liquid level meter 29.
Lower part is established in cement protective structure 3 in the liquid nitrogen storage tank 1, and cement protective structure 3 top is established on 1 upper portion of liquid nitrogen storage tank, and remaining nitrogen jar 2 is established at well cement protective structure 3 top, and cement protective structure 3's lower part 1/3 is established below ground 4.
The liquid nitrogen storage tank 1 and the residual nitrogen tank 2 are both provided with safety double-insurance pressure release valves, one of the safety double-insurance pressure release valves is used for standby, and the pressure release valves automatically take off and release pressure to ensure safety.
During the operation, the normal automatic pressure release of numerous liquid nitrogen storage tank 1, surplus nitrogen collects and gets into in the surplus nitrogen jar 2 after the compressor 8 liquefies along surplus nitrogen input tube 9, collect full half when surplus nitrogen collects, when 2/3 at most, the level gauge is with signal transmission to PLC, PLC control solenoid valve 71 is opened, liquid nitrogen is imported into liquid nitrogen input tube 5, arbitrary storage advances liquid nitrogen storage tank 1, the realization is retrieved, the safe pressure release of surplus nitrogen jar 2 is realized with vaporizer 28 cooperation to pressure release mouthful two 24 simultaneously, whole tank field is the sound of surplus nitrogen jar 2 pressure release only, noise greatly reduced, and need not be close to liquid nitrogen storage tank 1 and observe its pressure release state in turn when patrolling and examining, it is normal just to know pressure release work to listen sound, it is more convenient.
In the process, if the flow of the flow meter 91 is suddenly increased, the increase of the leaked nitrogen is indicated, which means that the vacuum heat insulation state of a certain liquid nitrogen storage tank needs to be in-situ overhauled in time. Only need climb up half cement protective structure 3 on the ground in patrolling and examining, it is convenient high-efficient.
The cement protective structure 3 is inflated when the tank truck enters the field. Safer, insert liquid nitrogen output tube 6 and fill dress on ground, it is more convenient.

Claims (7)

1. A large-scale direct-supply high-purity nitrogen residual gas storage tank comprises a liquid nitrogen storage tank (1), a liquid nitrogen input pipe (5) and a liquid nitrogen output pipe (6), wherein a nitrogen inlet I (11), a nitrogen outlet I (12), a liquid discharge port I (13) and a pressure relief port I (14) are arranged on the liquid nitrogen storage tank (1); the method is characterized in that: the nitrogen-containing waste gas recovery device is characterized by further comprising a waste nitrogen tank (2), wherein a nitrogen inlet II (21), a nitrogen outlet II (22), a liquid outlet II (23) and a pressure relief opening II (24) are formed in the waste nitrogen tank (2), the nitrogen inlet II (21) is connected with the pressure relief opening I (14) through a waste nitrogen input pipe (9), a compressor (8) is arranged on the waste nitrogen input pipe (9), and the nitrogen outlet II (22) is connected with the liquid nitrogen input pipe (5) through a waste nitrogen output pipe (7); and the residual nitrogen output pipe (7) and the residual nitrogen input pipe (9) are both vacuum jacket pipes, and corrugated compensation pipes (10) are arranged in the inner pipes of the residual nitrogen output pipe (7) and the residual nitrogen input pipe (9).
2. The large direct-supply high-purity nitrogen residual gas storage tank as claimed in claim 1, wherein: the number of the liquid nitrogen storage tanks (1) is at least 2, a nitrogen outlet I (12) of each liquid nitrogen storage tank (1) is connected to a liquid nitrogen output pipe (6), and a nitrogen inlet I (11) of each liquid nitrogen storage tank (1) is connected to a liquid nitrogen input pipe (5).
3. A large direct-feed high-purity nitrogen surplus-gas storage tank as claimed in claim 1 or 2, wherein: a vacuum cavity (25) is arranged between the inner wall (26) and the outer wall (27) of the residual nitrogen tank (2), and a liquid level meter (29) is arranged on the upper portion of the inner wall (26).
4. A large direct-feed high-purity nitrogen surplus gas storage tank as claimed in claim 3, wherein: and an electromagnetic valve (71) is arranged on the residual nitrogen output pipe (7), and a PLC (72) is arranged between the electromagnetic valve (71) and the liquid level meter (29).
5. The large direct-supply high-purity nitrogen residual gas storage tank as claimed in claim 1, wherein: lower part is established in cement protective structure (3) in liquid nitrogen storage tank (1), cement protective structure (3) top is established on liquid nitrogen storage tank (1) upper portion, cement protective structure (3) top is established in surplus nitrogen jar (2), the lower part 1/3 of cement protective structure (3) is established below ground (4).
6. The large direct-feed high-purity nitrogen residual gas storage tank as claimed in claim 4, wherein: and a flowmeter (91) is arranged on the residual nitrogen input pipe (9), and the flowmeter (91) is connected with an alarm (92).
7. The large direct-supply high-purity nitrogen residual gas storage tank as claimed in claim 1, wherein: and a carburetor (28) is arranged on a pipeline of the second pressure relief opening (24).
CN202122584489.XU 2021-10-26 2021-10-26 Large-scale direct-feed high-purity nitrogen residual gas storage tank Active CN216520898U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122584489.XU CN216520898U (en) 2021-10-26 2021-10-26 Large-scale direct-feed high-purity nitrogen residual gas storage tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122584489.XU CN216520898U (en) 2021-10-26 2021-10-26 Large-scale direct-feed high-purity nitrogen residual gas storage tank

Publications (1)

Publication Number Publication Date
CN216520898U true CN216520898U (en) 2022-05-13

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ID=81524169

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202122584489.XU Active CN216520898U (en) 2021-10-26 2021-10-26 Large-scale direct-feed high-purity nitrogen residual gas storage tank

Country Status (1)

Country Link
CN (1) CN216520898U (en)

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