CN219140488U - Anti-overcharging structure of low-temperature liquid storage device - Google Patents

Abstract

The utility model relates to the technical field of cold storage tanks, in particular to an overcharge-preventing structure of a low-temperature liquid storage device. Including jar body and overflow arrangement, wherein overflow arrangement includes overflow pipe and temperature sensing unit, overflow pipe one end sets up in jar internal portion, and the overflow pipe other end is connected with temperature sensing unit, temperature sensing unit still is connected with the recovery pipe. The utility model changes the condition that the overflow pipe is connected with the temperature sensing unit to be closed circuit in the prior art, and the recovery pipe is arranged to timely remove the gas remained in the overflow device. When the medium is filled into the storage device again, the overflowed medium can directly overflow to the temperature sensing unit outwards, so that the filling device can be closed timely, the risk of excessive filling is avoided, and the safety of the low-temperature liquid storage device during medium filling is improved.

Description

Anti-overcharging structure of low-temperature liquid storage device

Technical Field

The utility model relates to the technical field of cold storage tanks, in particular to an overcharge-preventing structure of a low-temperature liquid storage device.

Background

Cryogenic liquids such as liquefied natural gas, liquid oxygen, liquid nitrogen, etc., require extremely low temperatures to maintain their liquid state. In order to avoid the potential safety hazard of the pressure of the storage tank or bottle increasing too quickly as the temperature increases due to vaporization of the cryogenic liquid, it is necessary to leave sufficient gas phase space in the tank or bottle in which these cryogenic liquids are stored. In order to ensure that there is sufficient gas phase space in the storage device, it is necessary to provide an overcharge prevention device in the storage device for the cryogenic liquid.

In the prior art, in order to solve the problem that a certain gas phase space is reserved in a low-temperature liquid storage device and prevent the low-temperature liquid storage device from being overcharged, a common practice is to arrange a filling opening on the storage device, and when the low-temperature liquid is filled to the filling rate of the set filling opening, the low-temperature liquid overflows from the arranged filling opening, and at the moment, the liquid filling device is closed again to stop continuously filling the medium into the storage device. This method is effective in ensuring that there is sufficient gas phase space in the storage device, but if the filling device is not closed timely, the cryogenic liquid discharged from the overflow port once accumulates to a certain concentration, with the risk of combustion explosion.

Still another way is through setting up the overflow pipe in storage device, after filling the filling medium fills to the filling rate of settlement, the medium will flow out from the overflow pipe, sets up temperature transmitter and emergency cut-off valve at overflow pipe tip to can detect the filling rate of settlement and timely control and close filling device, avoid low temperature liquid to spill over in a large number, cause the risk of combustion explosion. However, in this arrangement, the overflow pipe end and the temperature transmitter are in a normal temperature state, so that the overflowed liquid is vaporized, and the vaporized low-temperature liquid cannot be discharged. When the storage device is filled with the medium again, the overflow medium must overcome the resistance caused by the gas in the overflow pipe to overflow outwards and flow to the temperature transmitter, so that a certain delay exists when the actual filling amount of the temperature transmitter is measured, the risk of overfilling the low-temperature liquid possibly exists, and a certain potential safety hazard exists.

Therefore, how to improve the safety when filling low-temperature liquid is a problem to be solved by those skilled in the art.

Disclosure of Invention

The utility model aims to solve the technical problems in the prior art and aims to provide an overcharge-preventing structure of a low-temperature liquid storage device with higher safety.

The utility model aims at realizing the following technical scheme, and the method is as follows:

the utility model provides a low temperature liquid storage device prevents structure of filling excessively, includes jar body and overflow arrangement, its characterized in that: the overflow device comprises an overflow pipe and a temperature sensing unit, one end of the overflow pipe is arranged inside the tank body, the other end of the overflow pipe is connected with the temperature sensing unit, and the temperature sensing unit is also connected with a recovery pipe.

Further preferably, the number of the overflow pipes is two or more.

Further preferably, the overflow pipe is also connected with a root valve.

Further preferably, the recovery pipe is connected with a radiation main pipe.

Due to the adoption of the technical scheme, the beneficial effects are generated: by arranging the overflow device and the recovery pipe, the condition that the position of the overflow pipe connected with the temperature sensing unit is closed in the prior art is changed, so that the gas reserved in the overflow device can be timely discharged. When the medium is filled into the storage device again, the overflowed medium can directly overflow to the temperature sensing unit, so that the filling device can be closed timely, the risk of excessive filling is avoided, and the safety of the low-temperature liquid storage device during medium filling is improved.

Description of the drawings:

FIG. 1 is a schematic diagram of an anti-overcharging structure of a cryogenic liquid storage device of the present utility model.

Reference numerals:

101. an inner container; 102. a housing; 103. TCS department; 201. an overflow pipe; 202. a temperature sensing unit;

203. and (5) recycling the pipe.

Detailed Description

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

As shown in fig. 1, the utility model discloses an overfilling prevention structure for a marine LNG fuel tank, which comprises a tank body 100 and an overflow device 200, and is characterized in that: the overflow device 200 comprises an overflow pipe 201 and a temperature sensing unit 202, one end of the overflow pipe 201 is arranged inside the tank body 100, the other end of the overflow pipe 201 is arranged outside the tank body 100 and is connected with the temperature sensing unit 202, and the temperature sensing unit 202 is also connected with a recovery pipe 203.

An overcharge prevention structure of a cryogenic liquid storage device, such as a marine LNG fuel tank, comprises a tank body 100 and an overflow device 200, wherein the overflow device 200 comprises an overflow pipe 201 and a temperature sensing unit 202, and the main structure of the tank body 100 comprises an inner container 101, a shell 102 and a TCS site 103. The inner container 101 is used for storing LNG, namely liquid natural gas, with the temperature of-162 degrees, and a heat insulation material is adopted between the inner container 101 and the outer shell 102 to cool the liquid natural gas stored in the inner container 101. The TCS site 103 is a closed space and the fuel tank fittings, accessories, flanges, valves are enclosed within the airtight fuel tank fitting site (i.e. within the TCS site) where no medium is allowed to escape directly. In order to ensure that the inner container 101 has a certain gas phase space, an overflow pipe 201 is disposed in the inner container 101 of the tank body 100, one end of the overflow pipe 201 is located in the inner container 100, and the other end of the overflow pipe 201 is located outside the tank body 100 and is connected with a temperature sensing unit 202. When the liquid natural gas is filled into the inner container 101 through the filling device, after the liquid natural gas medium is filled to a set filling rate, namely, after the liquid medium is filled to a set position of the overflow pipe 201 in the inner container 101, the medium overflows from the overflow pipe 201 and flows through the temperature sensing unit 202, so that the temperature sensing unit 202 can detect the set filling rate and timely feed back to the filling device to stop filling the medium into the tank body 100, and a certain gas phase space is reserved in the inner container 101. Since the overflow pipe 201 is connected to the end of the temperature sensing unit 202 and the temperature sensing unit 202 is located in a normal temperature state, the overflowed liquid medium is vaporized therein, and the gas can be discharged to the outside through the recovery pipe 203 connected to the temperature sensing unit 202. When the storage device is filled with liquid again, no gas is left in the position of the temperature sensing unit 202 after the last filling, so that the gas at the end part of the overflow pipe 201 does not block the overflow medium from flowing in the position of the temperature sensing unit 202, and the overflow medium can directly flow outwards to the temperature sensing unit 202 through the overflow pipe 201, and the temperature sensing unit 202 can timely measure the actual filling amount, so that the filling device can be timely closed, and the risk of excessive filling of the tank body 100 is avoided.

Further preferably, in other embodiments of the present application, the number of overflow pipes 201 may be selected to be two or more. Two or more overflow pipes 201 are provided in the inner container 101 of the tank 100, and a plurality of overflow pipes 201 are provided at different height positions in the tank 100, so that the overflow pipes 201 at different heights can measure different filling rates of the liquefied natural gas. Not only can overcharge be prevented, but also the filling rate of the medium in the storage device can be measured. The arrangement of a plurality of overflow pipes 201 can also ensure that other overflow pipes 201 can be continuously used under the condition that part of the overflow pipes 201 are damaged, and the spare overflow pipes 201 can ensure the safety of the overcharge-preventing structure in use. And the overflow pipe 201 arranged at the lower position can play a role in leading to excessive filling, namely, when medium overflows from the overflow pipe 201 at the lower position, even if the filling device is not closed in time at the moment, the tank body 100 does not reach the limit filling rate at the moment, and the safety hidden trouble of overcharging does not exist. The arrangement further improves the use safety of the anti-overcharging structure of the marine LNG fuel tank.

Further preferably, in other embodiments of the present application, the root valve 300 may be optionally provided at the end of the overflow pipe 201 outside the tank 100. The root valve 300 provided at the end of each overflow pipe 201 serves to close the fluid flowing in the overflow pipe 201, and does not flow, and mainly serves as a stop. The root valve 300 can thus be used to close the overflow pipe 201 in case the storage device requires maintenance of its components when filled with cryogenic medium, so that liquid natural gas no longer flows out of the overflow pipe 201. Therefore, the operation of maintaining the marine LNG fuel tank is more convenient.

Further preferably, in other embodiments of the present application, the recovery tube 203 may alternatively be connected to the radiation manifold. Since the temperature sensing unit 202 is in a normal temperature state, the liquefied natural gas therein is vaporized due to a temperature rise, and the recovery pipe 203 is for discharging the liquefied natural gas vaporized at the temperature sensing unit 202 due to a temperature rise. Since the TCS site 103 in the tank 100 is a closed space, inside is a pipeline control system, where no medium is allowed to directly overflow. The recovery pipe 203 is thus connected to the emission header to avoid the aforementioned gaseous medium from entering the TCS site 103, thereby improving the safety of the marine LNG fuel tank anti-overcharging structure.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (5)

1. The utility model provides a low temperature liquid storage device prevents structure of filling, includes jar body (100) and overflow arrangement (200), its characterized in that: the overflow device (200) comprises an overflow pipe (201) and a temperature sensing unit (202), one end of the overflow pipe (201) is arranged inside the tank body (100), the other end of the overflow pipe (201) is connected with the temperature sensing unit (202), and the temperature sensing unit (202) is also connected with a recovery pipe (203).

2. The overcharge prevention structure of claim 1, wherein: the number of the overflow pipes (201) is two or more.

3. The overcharge prevention structure of claim 1 or 2, wherein: the overflow pipe (201) is also connected with a root valve.

4. The overcharge prevention structure of claim 1 or 2, wherein: the recovery pipe (203) is connected with a radiation main pipe.

5. The overcharge prevention structure of claim 3, wherein: the recovery pipe (203) is connected with a radiation main pipe.

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