CN213239318U - Detection apparatus for low temperature storage tank intermediate layer vacuum is invalid - Google Patents
Detection apparatus for low temperature storage tank intermediate layer vacuum is invalid Download PDFInfo
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- CN213239318U CN213239318U CN202022179951.3U CN202022179951U CN213239318U CN 213239318 U CN213239318 U CN 213239318U CN 202022179951 U CN202022179951 U CN 202022179951U CN 213239318 U CN213239318 U CN 213239318U
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Abstract
The utility model discloses a detection apparatus for low temperature storage tank intermediate layer vacuum inefficacy, include: the two ends are respectively a vacuum detection tube of an installation end and a negative pressure end, and the negative pressure end is connected with a negative pressure device; the vacuum detection tube is provided with a negative pressure control valve and is connected with a water detection tube with a first control valve, a hydrogen detection tube with a second control valve, a medium detection tube with a third control valve, an oxygen detection tube with a fourth control valve and a vacuum degree detection tube; the water detection tube is connected with a water adsorbent bin in which a water adsorbent is arranged, the hydrogen detection tube is connected with a hydrogen adsorbent bin in which a hydrogen adsorbent is arranged, the medium detection tube is provided with a medium gas detector, the oxygen detection tube is provided with an oxygen detector capable of detecting oxygen and oxygen concentration, and the vacuum degree detection tube is provided with a vacuum gauge. The detection device is simple in structure and low in manufacturing cost, and the implementation cost of the method for detecting the vacuum failure of the interlayer of the low-temperature storage tank is low.
Description
Technical Field
The utility model relates to a vacuum insulation cryrogenic equipment field for storing cryogenic liquids especially relates to the detection device that low temperature storage tank intermediate layer vacuum became invalid.
Background
The cryogenic storage tank is used for storing and transporting cryogenic liquids such as liquid nitrogen, liquid oxygen, liquid argon, liquefied natural gas and the like. The structure of the low-temperature storage tank mainly comprises: the vacuum-pumping device comprises an inner cylinder body and an outer cylinder body which are arranged inside and outside, wherein an interlayer is formed between the inner cylinder body and the outer cylinder body, a vacuum-pumping pipe communicated with the interlayer is arranged on the outer cylinder body, a vacuum valve is arranged on the vacuum-pumping pipe, and a vacuum adsorbent used for adsorbing gas so as to maintain vacuum is also arranged in the interlayer; the vacuum adsorbent comprises: the normal temperature adsorbent is arranged on the inner side wall of the outer cylinder body and used for adsorbing hydrogen released by the metal material and the interlayer heat-insulating material, and the low temperature adsorbent is arranged on the outer side wall of the inner cylinder body and used for adsorbing water vapor released by the interlayer heat-insulating material. Before the low-temperature storage tank is used, the vacuumizing pipe is connected with negative pressure equipment, and the interlayer is vacuumized to form a vacuum heat insulation layer.
At normal temperature, when the vacuum degree of the vacuum heat insulating layer is more than 5 multiplied by 10-1And Pa, the vacuum heat insulation layer is considered to be in a vacuum failure state. The reasons for vacuum failure include: leakage of the outer cylinder, leakage of the inner cylinder and failure of the vacuum adsorbent. The conventional detection means for testing whether the interlayer of the low-temperature storage tank fails in vacuum or not is vacuum degree measurement, cold test, helium leak detection or pressure test, and the conventional detection means can only determine whether the low-temperature storage tank is in vacuum or not, but cannot determine whether the interlayer of the low-temperature storage tank is in vacuum or notThe reason for the distorted empty of the low-temperature storage tank is judged, and the low-temperature storage tank is inconvenient to maintain.
Disclosure of Invention
The utility model aims to provide a: the utility model provides a detection device that low temperature storage tank intermediate layer vacuum became invalid, the device can detect the intermediate layer vacuum condition and can judge the low temperature storage tank intermediate layer vacuum reason of becoming invalid according to the detection achievement.
In order to achieve the above object, the utility model adopts the following technical scheme: detection device that low temperature storage tank intermediate layer vacuum became invalid, its characterized in that: the method comprises the following steps: one end of the vacuum detection tube is an installation end, the other end of the vacuum detection tube is a negative pressure end, the negative pressure end is connected with negative pressure equipment, and a negative pressure control valve is arranged on the vacuum detection tube; a vacuum detection tube between the mounting end and the negative pressure control valve is connected with a water detection tube with a first control valve, a hydrogen detection tube with a second control valve, a medium detection tube with a third control valve, an oxygen detection tube with a fourth control valve and a vacuum degree detection tube; the water detection tube is connected with a water adsorbent bin in which a water adsorbent is arranged, the hydrogen detection tube is connected with a hydrogen adsorbent bin in which a hydrogen adsorbent is arranged, the medium detection tube is provided with a medium gas detector, the oxygen detection tube is provided with an oxygen detector capable of detecting oxygen and oxygen concentration, and the vacuum degree detection tube is provided with a vacuum gauge.
Further, the aforementioned detection apparatus for vacuum failure of low-temperature storage tank interlayer, wherein: the vacuum gauge includes: the vacuum gauge includes: the ionization vacuum gauge and the resistance vacuum gauge are arranged in parallel, the signal output ends of the ionization vacuum gauge and the resistance vacuum gauge are connected with the signal input end of the vacuum measuring meter, and the vacuum measuring meter is an ionization and resistance composite vacuum meter.
Further, the aforementioned detection apparatus for vacuum failure of low-temperature storage tank interlayer, wherein: the range of the vacuum measuring meter is 105 Pa-10-5Pa 。
Further, the aforementioned detection apparatus for vacuum failure of low-temperature storage tank interlayer, wherein: and a data collector is arranged on a signal output port of the vacuum measuring meter.
Further, the aforementioned detection apparatus for vacuum failure of low-temperature storage tank interlayer, wherein: the negative pressure equipment is a vacuum pump.
The utility model has the advantages that: the detection device for vacuum failure of the interlayer of the low-temperature storage tank is simple in structure and low in manufacturing cost. The detection method adopting the detection device is simple and easy to operate, can detect whether the interlayer of the low-temperature storage tank is vacuum-failed or not, and can further judge the reason of the vacuum failure under the condition that the interlayer of the low-temperature storage tank is vacuum-failed, so that the low-temperature storage tank can be maintained conveniently.
Drawings
Fig. 1 is a schematic structural diagram of a device for detecting vacuum failure of an interlayer of a low-temperature storage tank.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and preferred embodiments.
The structure of the low-temperature storage tank mainly comprises: an inner cylinder 14 and an outer cylinder 13 which are arranged inside and outside, an interlayer is formed between the inner cylinder and the outer cylinder, a vacuum-pumping pipe 12 communicated with the interlayer is arranged on the outer cylinder 13, a vacuum valve 11 is arranged on the vacuum-pumping pipe 12, and a vacuum adsorbent for adsorbing gas so as to maintain vacuum is also arranged in the interlayer; the vacuum adsorbent comprises: normal temperature adsorbents and low temperature adsorbents. The normal temperature adsorbent is arranged on the inner side wall of the outer cylinder body 13 and is used for adsorbing hydrogen released by the metal material and the interlayer heat insulating material. The low-temperature adsorbent is arranged on the outer side wall of the inner cylinder 14 and is used for adsorbing water vapor released by the interlayer heat insulating material. Before the low-temperature storage tank is used, the vacuumizing pipe 12 is connected with negative pressure equipment, and the interlayer is vacuumized to form a vacuum heat insulation layer.
For convenience of description, the low-temperature storage tank to be detected, in which the low-temperature liquid is filled, is referred to as the object 1, and the low-temperature liquid in the inner cylinder 14 of the object 1 is referred to as a medium. After the interlayer of the low-temperature storage tank is vacuumized to form a vacuum heat insulation layer, the residual gas in the interlayer is generally: trace amounts of hydrogen, nitrogen, and inert gases. Reasons for interlayer vacuum failure include: leakage of the outer cylinder, leakage of the inner cylinder, failure of the normal-temperature adsorbent and failure of the low-temperature adsorbent. When the outer cylinder body 13 of the detected piece leaks, the atmosphere enters the interlayer of the detected piece 1; when the inner cylinder 14 of the detected piece leaks, the medium gas enters the interlayer of the detected piece 1; when the normal temperature adsorbent fails, hydrogen adsorbed by the normal temperature adsorbent is released into the interlayer of the detected piece 1; when the low-temperature adsorbent fails, water vapor adsorbed by the low-temperature adsorbent is released into the interlayer of the test object 1. The following describes an apparatus and a method for detecting vacuum failure of an interlayer of a cryogenic storage tank, taking a cryogenic storage tank filled with liquefied natural gas and a cryogenic storage tank filled with liquid oxygen as examples. The following examples were all tested at ambient temperature.
The first embodiment.
As shown in fig. 1, the medium in the test object 1 is lng, the main component of the lng is methane, and the device for detecting vacuum interlayer failure of the test object 1 includes: one end of the vacuum detection tube 2 is an installation end, the other end of the vacuum detection tube 2 is a negative pressure end, the negative pressure end is connected with a vacuum pump 9, and a negative pressure control valve 8 is arranged on the vacuum detection tube 2; a water detection pipe 411 with a first control valve 41, a hydrogen detection pipe 421 with a second control valve 42, a medium detection pipe 711 with a third control valve 71, an oxygen detection pipe 721 with a fourth control valve 72 and a vacuum degree detection pipe 54 are connected to the vacuum detection pipe 2 between the installation end and the negative pressure control valve 8; the water detection pipe 411 is connected with a water adsorbent bin 31 filled with a water adsorbent, the hydrogen detection pipe 421 is connected with a hydrogen adsorbent bin 32 filled with a hydrogen adsorbent, the medium detection pipe 711 is provided with a methane detector 61, the oxygen detection pipe 721 is provided with an oxygen detector 62 capable of detecting oxygen and oxygen concentration, and the vacuum degree detection pipe 54 is connected with a vacuum gauge 5. In practical use, the water adsorbent is usually a molecular sieve adsorbent, and the hydrogen adsorbent is usually an Ag400 hydrogen adsorbent. In order to ensure the measuring accuracy of the vacuum gauge 5, the vacuum gauge 5 comprises an ionization vacuum gauge 51 and a resistance vacuum gauge 52 which are arranged in parallel, the signal output ends of the ionization vacuum gauge 51 and the resistance vacuum gauge 52 are both connected with the signal input end of a vacuum measuring meter 53, and the measuring range of the vacuum measuring meter 53 is 105 Pa-10-5Pa, and is an ionization and resistance composite vacuum gauge. In order to facilitate the observation of the vacuum degree change of the vacuum detecting tube 2, a signal output port of the vacuum measuring meter 53 is provided with data collectionA device 10.
The inspection steps for inspecting the inspected object 1 by using the inspection apparatus are as follows:
firstly, connecting the mounting end of a vacuum detection tube 2 to an evacuation tube 12 of a detected piece when a vacuum valve 11 is in a closed state, starting a negative pressure control valve 8, a first control valve 41, a second control valve 42, a third control valve 71 and a fourth control valve 72, and starting a vacuum pump 9 to evacuate the vacuum detection tube 2; when the measured value of the vacuum gauge 5 reaches 1X 10-2Pa, the negative pressure control valve 8 and the vacuum pump 9 are closed, and after the vacuum degree of the vacuum detection pipe 2 is stabilized, the measurement value of the vacuum gauge 5 is recorded, and then the first control valve 41, the second control valve 42, the third control valve 71, and the fourth control valve 72 are closed.
Secondly, opening the vacuum valve 11 and continuously recording the measurement value of the vacuum gauge 5, wherein the measurement value is more than 5 multiplied by 10-1Pa, judging the vacuum failure in the interlayer of the detected piece 1.
Thirdly, opening the first control valve 41 and continuously recording the measurement value of the vacuum gauge 5; if the measured value is not changed, the low-temperature adsorbent is judged to be effective.
Fourthly, closing the first control valve 41, opening the second control valve 42 and continuously recording the measurement value of the vacuum gauge 5; and if the measured value is not changed, judging that the normal temperature adsorbent is effective.
And fifthly, closing the second control valve 42, opening the third control valve 71 and the fourth control valve 72, detecting methane by the methane detector 61 and not detecting oxygen by the oxygen detector 62, and judging that the cylinder 14 in the detected object 1 is leaked.
Therefore, in the present embodiment, the inner cylinder 14 of the test object 1 leaks.
Example two.
As shown in fig. 1, the medium in the test piece 1 is liquid oxygen. The device for detecting vacuum failure of the interlayer of the object 1 is the same as that of the first embodiment.
The inspection steps for inspecting the inspected object 1 by using the inspection apparatus are as follows:
first, when the vacuum valve 11 is in a closed state, the mounting end of the vacuum detection tube 2 is connected to the evacuation tube 12 of the object, and the negative pressure control valve 8, the first control valve 41, the second control valve 42, and the second control valve 42 are openedThree control valves 71, a fourth control valve 72. Starting a vacuum pump 9 to vacuumize the vacuum detection tube 2; when the vacuum gauge indicates that the vacuum degree in the vacuum detection tube 2 reaches 1 x 10-2Pa, the negative pressure control valve 8 and the vacuum pump 9 are closed, and after the vacuum degree of the vacuum detection pipe 2 is stabilized, the measurement value of the vacuum gauge is recorded, and then the first control valve 41, the second control valve 42, the third control valve 71, and the fourth control valve 72 are closed.
Secondly, opening the vacuum valve 11 and continuously recording the measurement value of the vacuum gauge 5, wherein the measurement value is more than 5 multiplied by 10-1Pa, judging the vacuum failure in the interlayer of the detected piece 1.
Thirdly, opening the first control valve 41 and continuously recording the measurement value of the vacuum gauge 5; if the measured value is unchanged, no water vapor exists in the interlayer, and the effectiveness of the low-temperature adsorbent is judged.
Fourthly, closing the first control valve 41, opening the second control valve 42 and continuously recording the measurement value of the vacuum gauge 5; if the measured value is unchanged, no hydrogen exists in the interlayer, and the effectiveness of the normal-temperature adsorbent is judged.
And fifthly, closing the second control valve 42, opening the fourth control valve 72, and judging that the inner cylinder 14 of the detected piece is leaked when the oxygen detector 62 detects oxygen and the concentration of the oxygen is 50%.
Therefore, in the present embodiment, the inner cylinder 14 of the test object 1 leaks.
In the first and second examples, when the water vapor adsorption test and the hydrogen gas adsorption test are performed, the tests need to be performed while keeping the gas components existing in the interlayer space from being disturbed. In the case where the outer cylinder 13 of the test piece 1 leaks, since the amount of water vapor and hydrogen gas contained in the atmosphere entering the interlayer space during the test time is small, it is considered that the gas components existing in the interlayer space are not disturbed. When the inner cylinder 14 in the test object 1 leaks, in the first embodiment, liquefied natural gas enters the interlayer space, and in the second embodiment, oxygen enters the interlayer space, it is considered that the original gas components in the interlayer space are not disturbed.
The utility model has the advantages that: the device for detecting the vacuum failure of the interlayer of the low-temperature storage tank is simple in structure and low in manufacturing cost, so that the implementation cost of the method for detecting the vacuum failure of the interlayer of the low-temperature storage tank is low. Secondly, the detection method adopting the detection device is simple and easy to operate, can detect whether the interlayer of the detected piece 1 is vacuum-failed or not, and can further judge the reason of the vacuum failure under the condition that the interlayer of the detected piece 1 is vacuum-failed, thereby facilitating the maintenance of the low-temperature storage tank.
Claims (5)
1. Detection device that low temperature storage tank intermediate layer vacuum became invalid, its characterized in that: the method comprises the following steps: one end of the vacuum detection tube is an installation end, the other end of the vacuum detection tube is a negative pressure end, the negative pressure end is connected with negative pressure equipment, and a negative pressure control valve is arranged on the vacuum detection tube; a vacuum detection tube between the mounting end and the negative pressure control valve is connected with a water detection tube with a first control valve, a hydrogen detection tube with a second control valve, a medium detection tube with a third control valve, an oxygen detection tube with a fourth control valve and a vacuum degree detection tube; the water detection tube is connected with a water adsorbent bin in which a water adsorbent is arranged, the hydrogen detection tube is connected with a hydrogen adsorbent bin in which a hydrogen adsorbent is arranged, the medium detection tube is provided with a medium gas detector, the oxygen detection tube is provided with an oxygen detector capable of detecting oxygen and oxygen concentration, and the vacuum degree detection tube is provided with a vacuum gauge.
2. The cryogenic storage tank sandwich vacuum failure detection device of claim 1, wherein: the vacuum gauge includes: the ionization vacuum gauge and the resistance vacuum gauge are arranged in parallel, the signal output ends of the ionization vacuum gauge and the resistance vacuum gauge are connected with the signal input end of the vacuum measuring meter, and the vacuum measuring meter is an ionization and resistance composite vacuum meter.
3. The cryogenic storage tank sandwich vacuum failure detection device of claim 2, wherein: the range of the vacuum measuring meter is 105 Pa-10-5Pa 。
4. The cryogenic storage tank sandwich vacuum failure detection device of claim 2, wherein: and a data collector is arranged on a signal output port of the vacuum measuring meter.
5. The cryogenic storage tank sandwich vacuum failure detection apparatus of claim 1 or 2, wherein: the negative pressure equipment is a vacuum pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022179951.3U CN213239318U (en) | 2020-09-29 | 2020-09-29 | Detection apparatus for low temperature storage tank intermediate layer vacuum is invalid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022179951.3U CN213239318U (en) | 2020-09-29 | 2020-09-29 | Detection apparatus for low temperature storage tank intermediate layer vacuum is invalid |
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