Sealing gas system of low-temperature cold box

Abstract

The utility model relates to the technical field of low-temperature cold box sealing, in particular to a low-temperature cold box sealing gas system which comprises a top shell and a nitrogen pipeline, a hole is formed in the top of the top shell and communicated with a top pipe, the bottom of the top shell is communicated with a bottom shell, cold state equipment is fixedly installed in the bottom shell, and the low-temperature cold box sealing gas system further comprises a communicating pipe. The communicating pipe is communicated with the top of the top pipe; wherein the communicating pipe is provided with a hole and is communicated with a branch pipe; the end, away from the communicating pipe, of the branch pipe communicates with a first control valve. Wherein the bottom end of the communicating pipe is communicated with a gas one-way valve. The utility model solves the problems that the use requirement of the upper part of the cold box cannot be met after polluted nitrogen in the original design, the top of the cold box is iced, the potential safety hazard exists in the equipment operation, the heat transfer between the equipment and the air is increased due to the icing, and the energy consumption of the equipment operation is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature cold box sealing, in particular to a low-temperature cold box sealing gas system. Background Art

[0002] Most of the media in the heat exchange and distillation systems work in a low temperature environment (-120℃~-196℃). In order to ensure the normal operation of the distillation process, it is necessary to ensure that the media works under relatively ideal insulation conditions. Therefore, a metal cold box that is relatively closed to the outside world is required. The space inside the cold box is filled with pearlescent sand with a very low heat transfer coefficient to isolate it from the atmosphere. As production continues, the lowest temperature in the cold box gradually drops to -196℃, and the pressure in the cold box gradually decreases. In order to prevent the entry of humid air caused by the low pressure of the cold box, the dirty nitrogen gas (about 10Kpa) from the air separation system is introduced into the cold box as a sealing gas to ensure that the entire cold box is in a positive pressure state.

[0003] During on-site use, due to the large air separation capacity on site, the large amount of pearl sand filled in the cold box and its heavy weight, the use requirements of the upper part of the cold box could not be met after passing through the originally designed contaminated nitrogen gas (about 10Kpa). There was ice on the top of the cold box, which posed a safety hazard to the operation of the equipment. At the same time, the ice increased the heat transfer between the equipment and the air, increasing the energy consumption of the equipment. Utility Model Content

[0004] The utility model aims to provide a low-temperature cold box sealing gas system, which has the advantages of using the existing nitrogen pipeline network to replace the medium and decompress the nitrogen to meet the requirements for the use of sealing gas, and solves the problem that the dirty nitrogen in the original design cannot meet the use requirements of the upper part of the cold box, and there is ice on the top of the cold box, which poses a safety hazard to the operation of the equipment. At the same time, the ice increases the heat transfer between the equipment and the air, thereby increasing the energy consumption of the equipment operation.

[0005] To achieve the above object, the utility model provides the following technical solution: a low temperature cold box sealing gas system, comprising a top shell and a nitrogen pipeline, the top shell has a hole at the top and is connected to a top pipe, the bottom of the top shell is connected to a bottom shell, a cold device is fixedly installed in the bottom shell, and further comprises a connecting pipe;

[0006] The connecting pipe is connected and installed on the top of the top pipe;

[0007] Wherein, a hole is opened on the connecting pipe and a branch pipe is connected and installed;

[0008] Wherein, one end of the branch pipe away from the connecting pipe is connected and installed with a first control valve;

[0009] Wherein, a gas one-way valve is installed at the bottom end of the connecting pipe.

[0010] When using a low-temperature cold box sealing gas system in the technical solution, pearl sand is filled in the bottom shell above the cold equipment, and the top shell is installed on the top of the bottom shell. At this time, the first control valve can be opened and the second control valve can be closed, so that the pure nitrogen in the nitrogen pipeline enters the opposite side of the top shell and the bottom shell, so that the injected nitrogen acts as a sealing gas. At this time, the first control valve is closed, so that the top shell and the bottom shell are in a relatively sealed environment, and the warm air is introduced into the cold equipment through the air inlet pipe, and the temperature is reduced by the cold equipment. During the cooling process, the pressure in the top shell and the bottom shell increases. At this time, the second control valve is opened, so that the nitrogen is pushed out by the cooled air and returned to the nitrogen pipeline. At the same time, after the nitrogen is greatly reduced, the cooled air can be discharged through the air outlet pipe.

[0011] Preferably, a hole is opened on the front side of the top shell and an air outlet pipe is installed in communication therewith, and a flange is provided at one end of the air outlet pipe away from the top shell.

[0012] An air outlet pipe is installed by opening a hole on the front side of the top shell and connecting it, and a flange is provided at one end of the air outlet pipe away from the top shell, so that the air outlet pipe can be connected and installed with subsequent processing equipment through the flange.

[0013] Preferably, the front side of the bottom shell is grooved, the control end of the cold device passes through the groove on the front side of the bottom shell, a hole is opened on one side of the bottom shell and an air intake pipe is embedded and installed, a flange is provided on the end of the air intake pipe facing away from the bottom shell, and the air intake pipe in the bottom shell is connected and installed with the cold device.

[0014] A groove is made on the front side of the bottom shell, and the control end of the cold device is passed through the groove on the front side of the bottom shell, so that it is stuck on the outside of the bottom shell to control the cold device. At the same time, a hole is made on one side of the bottom shell and an air intake pipe is embedded and installed, and a flange is provided at the end of the air intake pipe away from the bottom shell. The air intake pipe can be easily connected to the air intake device through the flange. At the same time, the air intake pipe in the bottom shell is connected and installed with the cold device, so that the injected warm air can enter the air intake pipe.

[0015] Preferably, the bottom shell above the cold equipment is filled with pearlescent sand.

[0016] The bottom shell above the cold equipment is filled with pearlescent sand, so that the heat insulation operation is carried out by pearlescent sand.

[0017] Preferably, a second control valve is fixedly installed on the connecting pipe below the branch pipe.

[0018] The second control valve is fixedly installed on the connecting pipe below the branch pipe, so that the discharge of nitrogen from the side opposite to the top shell and the bottom shell can be controlled by the second control valve.

[0019] Preferably, the end of the first control valve away from the branch pipe is connected and installed in communication with the nitrogen pipeline.

[0020] The end of the first control valve away from the branch pipe is connected and installed with the nitrogen pipeline, so that the nitrogen enters the branch pipe from the nitrogen pipeline by opening the first control valve, and enters the side opposite to the top shell and the bottom shell through the connecting pipe.

[0021] Preferably, the end of the gas one-way valve facing away from the connecting pipe is connected and installed with the nitrogen pipeline.

[0022] By connecting and installing the end of the gas one-way valve away from the connecting pipe with the nitrogen pipeline, when the pressure on the side opposite to the top shell and the bottom shell is too high, the nitrogen can be pushed out through the gas one-way valve and returned to the nitrogen pipeline.

[0023] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0024] The utility model provides a connecting pipe, and connects and installs the connecting pipe on the top of the top pipe, and opens a hole on the connecting pipe and connects and installs a branch pipe. At the same time, the end of the branch pipe away from the connecting pipe is connected and installed with a first control valve, and the bottom end of the connecting pipe is connected and installed with a gas check valve. In specific operation, pearl sand is filled in the bottom shell above the cold equipment, and the top shell is installed on the top of the bottom shell. At this time, the first control valve can be opened and the second control valve can be closed, so that the pure nitrogen in the nitrogen pipeline enters the opposite side of the top shell and the bottom shell, so that the injected nitrogen acts as a sealing gas. The first control valve is closed at this time, so that the top shell and the bottom shell are in a relatively sealed environment, and the warm air is introduced into the cold equipment through the air inlet pipe, and the temperature is reduced by the cold equipment. During the cooling process, the pressure in the top shell and the bottom shell increases. At this time, the second control valve is opened, so that the nitrogen is pushed out by the cooled air and returned to the nitrogen pipeline. At the same time, after a large amount of nitrogen is reduced, the cooled air can be led out through the air outlet pipe, so as to achieve the effect of using the existing nitrogen pipeline network to replace the medium and reduce the pressure of nitrogen to meet the requirements for the use of sealing gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0027] Figure 3 It is a front view structural schematic diagram of the utility model.

[0028] In the figure: 1. top shell; 2. connecting pipe; 3. first control valve; 4. nitrogen pipeline; 5. gas one-way valve; 6. air inlet pipe; 7. bottom shell; 8. cold equipment; 9. air outlet pipe; 10. top pipe; 11. branch pipe; 12. second control valve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the utility model is provided: a low-temperature cold box sealing gas system, including a top shell 1 and a nitrogen pipeline 4, the top shell 1 has a hole on the top and is connected to a top pipe 10, the bottom of the top shell 1 is connected to a bottom shell 7, a cold device 8 is fixedly installed in the bottom shell 7, and also includes a connecting pipe 2;

[0032] Specifically, the connecting pipe 2 is connected and installed on the top of the top pipe 10;

[0033] The connecting pipe 2 has a hole and is connected with a branch pipe 11;

[0034] The end of the branch pipe 11 away from the connecting pipe 2 is connected with the first control valve 3;

[0035] Among them, a gas one-way valve 5 is installed at the bottom end of the connecting pipe 2.

[0036] By setting a connecting pipe 2, and connecting the connecting pipe 2 to the top of the top pipe 10, and opening a hole in the connecting pipe 2 and connecting and installing a branch pipe 11, at the same time, the end of the branch pipe 11 away from the connecting pipe 2 is connected and installed with a first control valve 3, and the bottom end of the connecting pipe 2 is connected and installed with a gas check valve 5. In the specific operation, the pearl sand is filled in the bottom shell 7 above the cold equipment 8, and the top shell 1 is installed on the top of the bottom shell 7. At this time, the first control valve 3 can be opened and the second control valve 12 can be closed, so that the pure nitrogen in the nitrogen pipeline 4 enters the top shell 1 and the bottom shell 7 opposite side, so that the injected nitrogen acts as Sealing gas, at this time, close the first control valve 3, so that the top shell 1 and the bottom shell 7 are in a relatively sealed environment, and the warm air is introduced into the cold equipment 8 through the air inlet pipe 6, and the temperature is cooled by the cold equipment 8. During the cooling process, the pressure in the top shell 1 and the bottom shell 7 increases. At this time, open the second control valve 12, so that the nitrogen is pushed out by the cooled air and returned to the nitrogen pipeline 4. At the same time, after a large amount of nitrogen is reduced, the cooled air can be led out through the air outlet pipe 9, so as to achieve the effect of using the existing nitrogen pipeline network to replace the medium and reduce the pressure of nitrogen to meet the requirements for the use of sealing gas.

[0037] Furthermore, a hole is opened on the front side of the top shell 1 and an air outlet pipe 9 is installed in communication therewith. A flange is provided at one end of the air outlet pipe 9 which is away from the top shell 1 .

[0038] An air outlet pipe 9 is installed by opening a hole on the front side of the top shell 1 and connecting it, and a flange is provided at one end of the air outlet pipe 9 away from the top shell 1, so that the air outlet pipe 9 can be connected and installed with subsequent processing equipment through the flange.

[0039] Furthermore, a groove is opened on the front side of the bottom shell 7, and the control end of the cold device 8 passes through the groove on the front side of the bottom shell 7. A hole is opened on one side of the bottom shell 7 and an air intake pipe 6 is embedded and installed. A flange is provided on the end of the air intake pipe 6 facing away from the bottom shell 7. The air intake pipe 6 in the bottom shell 7 is connected and installed with the cold device 8.

[0040] By making a groove on the front side of the bottom shell 7 and passing the control end of the cold device 8 through the groove on the front side of the bottom shell 7, the cold device 8 is controlled by being stuck on the outside of the bottom shell 7. At the same time, a hole is made on one side of the bottom shell 7 and an air intake pipe 6 is embedded and installed. A flange is provided at the end of the air intake pipe 6 away from the bottom shell 7. The air intake pipe 6 can be easily connected to the air intake device through the flange. At the same time, the air intake pipe 6 in the bottom shell 7 is connected and installed with the cold device 8, so that the injected warm air can enter the air intake pipe 6.

[0041] Furthermore, the bottom shell 7 above the cold equipment 8 is filled with pearlescent sand.

[0042] The bottom shell 7 above the cold device 8 is filled with pearlescent sand, so that the heat insulation operation is performed by the pearlescent sand.

[0043] Furthermore, a second control valve 12 is fixedly installed on the connecting pipe 2 below the branch pipe 11 .

[0044] The second control valve 12 is fixedly installed on the connecting pipe 2 below the branch pipe 11 , so that the discharge of nitrogen from the side opposite to the top shell 1 and the bottom shell 7 can be controlled by the second control valve 12 .

[0045] Furthermore, one end of the first control valve 3 away from the branch pipe 11 is connected and installed with the nitrogen pipeline 4 .

[0046] The end of the first control valve 3 facing away from the branch pipe 11 is connected to the nitrogen pipeline 4 and installed so that the nitrogen enters the branch pipe 11 from the nitrogen pipeline 4 by opening the first control valve 3 and enters the side opposite to the top shell 1 and the bottom shell 7 through the connecting pipe 2.

[0047] Furthermore, one end of the gas one-way valve 5 away from the connecting pipe 2 is connected and installed with the nitrogen pipeline 4 .

[0048] By installing the end of the gas one-way valve 5 facing away from the connecting pipe 2 in communication with the nitrogen pipeline 4 , when the pressure on the side opposite to the top shell 1 and the bottom shell 7 is too high, the nitrogen can be pushed out through the gas one-way valve 5 and returned to the nitrogen pipeline 4 . When the utility model is used, pearl sand is filled in the bottom shell 7 above the cold equipment 8, and the top shell 1 is installed on the top of the bottom shell 7. At this time, the first control valve 3 can be opened and the second control valve 12 can be closed, so that the pure nitrogen in the nitrogen pipeline 4 enters the side opposite to the top shell 1 and the bottom shell 7, so that the injected nitrogen acts as a sealing gas. At this time, the first control valve 3 is closed, so that the top shell 1 and the bottom shell 7 are in a relatively sealed environment, and the warm air is introduced into the cold equipment 8 through the air inlet pipe 6, and the cold equipment 8 is cooled. During the cooling process, the pressure in the top shell 1 and the bottom shell 7 increases. At this time, the second control valve 12 is opened, so that the nitrogen is pushed out through the cooled air and returned to the nitrogen pipeline 4. At the same time, after the nitrogen is greatly reduced, the cooled air can be discharged through the air outlet pipe 9.

[0049] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A low temperature cold box sealing gas system, comprising a top shell (1) and a nitrogen pipeline (4), wherein the top shell (1) has a hole at the top and is connected to a top pipe (10), and the bottom of the top shell (1) is connected to a bottom shell (7), wherein a cold device (8) is fixedly installed in the bottom shell (7), characterized in that: Also includes: A connecting pipe (2) connected and installed on the top of the top pipe (10); Wherein, a hole is opened on the connecting pipe (2) and a branch pipe (11) is installed in connection therewith; Wherein, one end of the branch pipe (11) away from the connecting pipe (2) is connected to and installed with a first control valve (3); Wherein, a gas one-way valve (5) is installed at the bottom end of the connecting pipe (2).

2. A low temperature cold box sealing gas system according to claim 1, characterized in that: The front side of the top shell (1) is opened and connected to an air outlet pipe (9), and a flange is provided at one end of the air outlet pipe (9) facing away from the top shell (1).

3. A low temperature cold box sealing gas system according to claim 1, characterized in that: The bottom shell (7) has a groove on the front side, and the control end of the cold device (8) passes through the groove on the front side of the bottom shell (7). A hole is opened on one side of the bottom shell (7) and an air intake pipe (6) is embedded and installed. A flange is provided at one end of the air intake pipe (6) away from the bottom shell (7). The air intake pipe (6) in the bottom shell (7) is connected and installed with the cold device (8).

4. A low temperature cold box sealing gas system according to claim 1, characterized in that: The bottom shell (7) above the cold equipment (8) is filled with pearlescent sand.

5. A low temperature cold box sealing gas system according to claim 1, characterized in that: A second control valve (12) is fixedly mounted on the connecting pipe (2) below the branch pipe (11).

6. A low temperature cold box sealing gas system according to claim 1, characterized in that: The end of the first control valve (3) facing away from the branch pipe (11) is connected and installed with the nitrogen pipeline (4).

7. A low temperature cold box sealing gas system according to claim 1, characterized in that: The end of the gas one-way valve (5) facing away from the connecting pipe (2) is connected and installed with the nitrogen pipeline (4).

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