CN216619333U - Low temperature storage tank intermediate layer space replacement gas fills dress pressure control system - Google Patents
Low temperature storage tank intermediate layer space replacement gas fills dress pressure control system Download PDFInfo
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- CN216619333U CN216619333U CN202123063669.XU CN202123063669U CN216619333U CN 216619333 U CN216619333 U CN 216619333U CN 202123063669 U CN202123063669 U CN 202123063669U CN 216619333 U CN216619333 U CN 216619333U
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Abstract
The utility model provides a low-temperature storage tank interlayer space replacement gas filling pressure control system which comprises an inflation pressure control unit, wherein the gas inlet end of the inflation pressure control unit is communicated with a replacement gas pipeline to be filled, the gas outlet end of the inflation pressure control unit is communicated with a vacuum valve at a vacuum port of a low-temperature storage tank, and the inflation pressure control unit controls the gas pressure in the interlayer space of the storage tank to be below 0.02Mpa through an automatic exhaust valve and a vacuum one-way valve. The utility model solves the technical problem that the inflation pressure is required to be accurately controlled when gas is filled into the storage tank, so that the inflation pressure is not more than 0.04MPa, ensures that the filling pressure meets the standard requirement effect, and ensures that the inner container cannot be unstable due to overhigh external pressure (more than 0.04MPa) caused by overhigh inflation pressure of the interlayer space at any time.
Description
Technical Field
The utility model relates to the technical field of filling of interlayer space replacement gas of a low-temperature storage tank, in particular to a pressure control system for filling of interlayer space replacement gas of a low-temperature storage tank.
Background
The low-temperature storage tank is a double-layer heat insulation storage tank for storing media such as liquid oxygen, nitrogen, argon, LNG and the like, an inner container of the low-temperature storage tank is usually made of austenitic stainless steel, an outer container jacket is made of medium and low carbon steel or low alloy steel or stainless steel, an interlayer in the middle of the storage tank is filled with pearled sand or an inner container is wound with a heat insulation material, and then the interlayer space is vacuumized to achieve the heat insulation effect; in order to accelerate the speed in the vacuum pumping process, replacement gas such as nitrogen and the like is filled into the interlayer, so that the purposes of flushing, replacement and the like are achieved.
However, in the actual operation process of inflating the interlayer space, automatic protection cannot be realized due to the pressure during inflation, and under the condition of misoperation of personnel, the inflation pressure of the interlayer space is very high, so that the inner container is unstable due to overhigh external pressure, permanent damage is caused, and the standard requirement is as follows: the pressure of the displacement gas filled in the intermediate layer must not exceed 0.04Mpa, and therefore, when the gas is filled in the storage tank, the inflation pressure must be accurately controlled.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a filling pressure control system for replacing gas in an interlayer space of a low-temperature storage tank, which solves the problem that the filling pressure needs to be accurately controlled when the interlayer space of the storage tank is inflated so as to prevent a tank body from being damaged in the prior art.
According to an embodiment of the utility model, a filling pressure control system for replacing gas in interlayer space of a cryogenic storage tank comprises the cryogenic storage tank, wherein the cryogenic storage tank comprises: the inner tank, the outer tank and the interlayer arranged between the inner tank and the outer tank; a vacuum pumping valve communicated with the interlayer is arranged on the outer tank, and the front end of the vacuum valve is provided with a third joint through a pipeline; the gas inlet end of the inflation pressure control unit is communicated with a replacement gas pipeline to be filled, and the gas outlet end of the inflation pressure control unit is communicated with the third joint; when the inflation pressure control unit inflates the replacement gas into the interlayer, the gas pressure in the interlayer can be controlled to be below 0.02 Mpa.
Preferably, the charge pressure control unit comprises a first valve and a second valve which are communicated with each other through a pipeline in sequence along the intake direction of the replacement gas: the automatic air-vent valve comprises a first joint, an air inlet valve, an automatic air outlet valve, a pressure gauge, a vacuum one-way valve and a second joint; the first joint is connected with a replacement gas pipeline to be filled; the second joint is connected with the third joint.
Preferably, the setting sequence of the automatic exhaust valve and the pressure gauge can be changed.
Preferably, the first joint, the second joint and the third joint are vacuum KF joints or vacuum flange joints.
Compared with the prior art, the utility model has the following beneficial effects: by adopting the inflation pressure control unit, the technical problem that the inflation pressure is required to be accurately controlled when gas is filled into the storage tank is solved, so that the inflation pressure cannot exceed 0.04MPa, the filling pressure is ensured to meet the standard requirement effect, and the technical effect that the inner container is unstable due to overhigh external pressure (more than 0.04MPa) caused by overhigh inflation pressure of the interlayer space is ensured at any time.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the above drawings: 1. a first joint; 2. an intake valve; 3. an automatic exhaust valve; 4. a pressure gauge; 5. a vacuum check valve; 6. a second joint; 7. a third joint; 8. a vacuum pumping valve; 9. an outer tank; 10. an inner tank.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
As shown in fig. 1: a cryogenic storage tank sandwich space replacement gas filling pressure control system, comprising a cryogenic storage tank, the cryogenic storage tank comprising: an inner tank 10, an outer tank 9 and an interlayer arranged between the inner tank 10 and the outer tank 9; the outer tank 9 is connected with a vacuum pumping valve 8 communicated with the interlayer through a pipeline, and the front end of the vacuum valve is provided with a third joint 7 through a pipeline; the device is characterized by also comprising an air inlet end of an inflation pressure control unit which is communicated with a replacement gas pipeline to be filled, and an air outlet end of the inflation pressure control unit is communicated with a third joint 7; when the inflation pressure control unit inflates the replacement gas into the interlayer, the gas pressure in the interlayer can be controlled to be below 0.02 Mpa.
The inflation pressure control unit comprises a gas inlet pipe communicated with the gas inlet pipe through pipelines in sequence along the gas inlet direction of the replacement gas: the device comprises a first connector 1, an air inlet valve 2, an automatic exhaust valve 3, a pressure gauge 4, a vacuum one-way valve 5 and a second connector 6; the first joint 1 is connected with a replacement gas pipeline to be filled; the second joint 6 is connected to a third joint 7.
In the utility model, the arrangement sequence of the automatic exhaust valve 3 and the pressure gauge 4 can be changed, and the pressure gauge 4 can be arranged at the front end of the automatic exhaust valve 3 or at the rear end of the automatic exhaust valve 3.
The first joint 1, the second joint 6 and the third joint 7 are vacuum KF joints or vacuum flange joints.
The detailed working process of the embodiment is as follows:
the interlayer is in a vacuum state, after an inflation pressure control unit is connected, an air inlet valve 2 is opened slowly, an automatic exhaust valve 3 is opened under the pressure action of replacement gas to automatically release pressure, meanwhile, all air in the pipeline is replaced, and at the moment, a pressure gauge 4 displays the pipeline pressure in the air release process; then the opening of the air inlet valve 2 is adjusted, so that the pressure value of the pressure gauge 4 is less than or equal to 0.02MPa and remains stable; then the vacuum-pumping valve 8 is opened, the vacuum one-way valve 5 is opened under the action of vacuum negative pressure in the interlayer, the replacement gas can be filled into the interlayer space, and meanwhile, the automatic exhaust valve 3 is closed under the double actions of gravity and vacuum suction to prevent external air from entering; with the loss of the vacuum of the interlayer, the vacuum one-way valve 5 is gradually closed until the filling of the replacement gas in the interlayer is completed, no matter whether the air inlet valve 2 can be closed in time or not, under the dual action of the automatic exhaust valve 3 and the vacuum one-way valve 5, the pressure value of the pipeline in the discharge state is certain to be less than or equal to 0.02MPa, and at the moment, the gas pressure in the interlayer is also certain to be less than or equal to 0.02 MPa. Therefore, the inner container cannot be unstable due to the overhigh external pressure (more than 0.04MPa) caused by overhigh inflation pressure of the interlayer space at any time.
Furthermore, because the structures of the inner tanks 10 of different storage tanks are different, the outer pressure which can be borne by the inner tanks are different, when the pressure of the replacement gas in the interlayer needs to be controlled to a specific pressure (for example, less than or equal to 0.1MPa), the air inlet valve 2 only needs to be opened slowly before the replacement gas is filled, and the pressure value of the pressure gauge 4 under the condition that the automatic exhaust valve 3 is fully opened is adjusted to be less than or equal to the filling pressure which needs to be controlled.
Further, in order to avoid the failure of the inflation pressure control unit under extreme conditions, under the condition that the composition mode of the inflation pressure control unit is unchanged and the operation principle is unchanged, the inflation pressure control unit can be set to be in a parallel connection mode with the same structure in the actual application process to carry out redundancy setting.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (4)
1. A cryogenic storage tank sandwich space replacement gas filling pressure control system, comprising a cryogenic storage tank, the cryogenic storage tank comprising: the inner tank, the outer tank and the interlayer arranged between the inner tank and the outer tank; a vacuum pumping valve communicated with the interlayer is arranged on the outer tank, and the front end of the vacuum valve is provided with a third joint through a pipeline; the device is characterized by also comprising an air inlet end of an inflation pressure control unit which is communicated with a replacement gas pipeline to be filled, and an air outlet end of the inflation pressure control unit is communicated with a third joint; when the inflation pressure control unit inflates the replacement gas into the interlayer, the gas pressure in the interlayer can be controlled to be below 0.02 Mpa.
2. The system for controlling filling pressure of displaced gas in interlayer space of cryogenic storage tank according to claim 1, wherein the inflation pressure control unit comprises a pipeline which is communicated with the displaced gas sequentially along the gas inlet direction: the automatic air-vent valve comprises a first joint, an air inlet valve, an automatic air outlet valve, a pressure gauge, a vacuum one-way valve and a second joint; the first joint is connected with a replacement gas pipeline to be filled; the second joint is connected with the third joint.
3. The system for controlling filling pressure of displaced gas in interlayer space of cryogenic storage tank according to claim 2, wherein the automatic exhaust valve and the pressure gauge are arranged in a reversed order.
4. The system for controlling filling pressure of displaced gas in interlayer space of cryogenic storage tank according to claim 2, wherein the first joint, the second joint and the third joint are vacuum KF joints or vacuum flange joints.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123063669.XU CN216619333U (en) | 2021-12-07 | 2021-12-07 | Low temperature storage tank intermediate layer space replacement gas fills dress pressure control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123063669.XU CN216619333U (en) | 2021-12-07 | 2021-12-07 | Low temperature storage tank intermediate layer space replacement gas fills dress pressure control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216619333U true CN216619333U (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123063669.XU Active CN216619333U (en) | 2021-12-07 | 2021-12-07 | Low temperature storage tank intermediate layer space replacement gas fills dress pressure control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216619333U (en) |
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2021
- 2021-12-07 CN CN202123063669.XU patent/CN216619333U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 402560 No. 5, Long'an Avenue, Dongcheng sub district office, Tongliang District, Chongqing (in the Industrial Park) Patentee after: Chongqing Xinyu Pressure Vessel Co.,Ltd. Address before: 402560 No. 5, Long'an Avenue, Dongcheng sub district office, Tongliang District, Chongqing (in the Industrial Park) Patentee before: CHONGQING XINYU PRESSURE CONTAINER MANUFACTURE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |