CN211821749U - Liquid nitrogen storage device, system and air separation system - Google Patents
Liquid nitrogen storage device, system and air separation system Download PDFInfo
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- CN211821749U CN211821749U CN202020251174.6U CN202020251174U CN211821749U CN 211821749 U CN211821749 U CN 211821749U CN 202020251174 U CN202020251174 U CN 202020251174U CN 211821749 U CN211821749 U CN 211821749U
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Abstract
The utility model provides a liquid nitrogen storage device, system and air separation system belongs to liquid nitrogen and stores technical field. The liquid nitrogen storage device comprises a liquid nitrogen storage tank, a low-temperature liquid pump, a sealing gas pipeline, a heating gas pipeline, a nitrogen gas supply pipeline and a nitrogen source; the low-temperature liquid pump is connected with the liquid nitrogen storage tank and is used for pressurizing and delivering the liquid nitrogen in the liquid nitrogen storage tank. The sealing gas pipeline is connected with the low-temperature liquid pump and used for providing sealing gas for the low-temperature liquid pump; the heating gas pipeline is communicated with a liquid outlet pipeline of the low-temperature liquid pump and is used for providing heating gas for the low-temperature liquid pump; the sealing gas pipeline and the heating gas pipeline are both communicated with the nitrogen gas supply pipeline; the nitrogen gas supply pipeline is connected with a nitrogen gas source. Because the sealing pipeline and the heating air pipeline adopt the same air source, the whole maintenance workload is smaller, and the maintenance cost is lower; and can also avoid the liquid nitrogen in the liquid nitrogen storage tank from being polluted.
Description
Technical Field
The utility model relates to a technical field is stored to the liquid nitrogen, particularly, relates to a liquid nitrogen storage device, system and air separation system.
Background
The air separation system is a set of industrial equipment for separating the component gases in the air to produce oxygen and nitrogen. In the air separation system, a liquid nitrogen storage device is an important part. The air sources of a sealing air pipeline and a heating air pipeline of a liquid nitrogen storage tank in the existing liquid nitrogen storage device are mutually independent and are device air and instrument air; the two air sources need to be operated and maintained by operators at the same time, so that the workload is inevitably increased, and the working efficiency is reduced; and can contaminate the liquid nitrogen within the liquid nitrogen storage tank.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a liquid nitrogen storage device, which adopts a single nitrogen gas source pipe to simultaneously supply gas to a sealing gas pipeline and a heating gas pipeline, thereby reducing the workload and improving the working efficiency; the pollution of device air and instrument air to the liquid nitrogen in the liquid nitrogen storage device is reduced.
Another object of the present invention is to provide a liquid nitrogen storage system, which includes two parallel liquid nitrogen storage devices.
Another object of the utility model is to provide an air separation system, it has adopted above-mentioned liquid nitrogen storage device to the maintenance work load has been reduced.
The utility model discloses a realize like this:
a liquid nitrogen storage device comprises a liquid nitrogen storage tank, a low-temperature liquid pump, a sealing gas pipeline, a heating gas pipeline, a nitrogen gas supply pipeline and a nitrogen gas source; the low-temperature liquid pump is connected with the liquid nitrogen storage tank and is used for pressurizing and delivering the liquid nitrogen in the liquid nitrogen storage tank;
the sealing gas pipeline is connected with the cryogenic liquid pump and used for providing sealing gas for the cryogenic liquid pump; the heating gas pipeline is communicated with a liquid outlet pipeline of the low-temperature liquid pump and is used for providing heating gas for the low-temperature liquid pump; the sealing gas pipeline and the heating gas pipeline are both communicated with the nitrogen gas supply pipeline; the nitrogen gas supply pipeline is connected with the nitrogen gas source.
Further, the method comprises the following steps of;
the device also comprises an instrument air supply pipeline and a device air supply pipeline; the sealed air pipeline is communicated with the instrument air supply pipeline, and the device air supply pipeline is communicated with the heating air pipeline.
Further, the method comprises the following steps of;
the nitrogen gas air supply pipeline, instrument air supply pipeline reach all be provided with the stop valve on the device air supply pipeline.
Further, the method comprises the following steps of;
still include the controller, the controller simultaneously with nitrogen gas air supply line instrument air supply line reaches stop valve communication connection on the device air supply line is used for control the switch of stop valve.
Further, the method comprises the following steps of;
and the nitrogen gas supply pipeline, the instrument air supply pipeline and the device air supply pipeline are all provided with pressure detection elements.
Further, the method comprises the following steps of;
the low-temperature liquid pump is arranged outside the liquid nitrogen storage tank.
Further, the method comprises the following steps of;
the low-temperature liquid pump is characterized by also comprising an emptying pipeline, wherein the emptying pipeline is communicated with the low-temperature liquid pump; and the emptying pipeline is provided with a control valve.
A liquid nitrogen storage system comprises a nitrogen main pipe and at least two liquid nitrogen storage devices; the nitrogen main pipe is communicated with a nitrogen gas supply pipeline of the liquid nitrogen storage device.
Further, the method comprises the following steps of;
and the nitrogen main pipe is provided with a control valve and a pressure detection element.
An air separation system comprises the liquid nitrogen storage device.
The utility model provides a technical scheme's beneficial effect is:
the liquid nitrogen storage device, the liquid nitrogen storage system and the air separation system which are obtained by the design are used for connecting the nitrogen gas supply pipe with the nitrogen gas source; the nitrogen in the nitrogen supply pipe simultaneously provides nitrogen for the sealing gas pipeline and the heating gas pipeline, and the nitrogen enters the sealing position in the low-temperature liquid pump through the sealing gas pipeline and reaches the liquid outlet pipeline of the low-temperature liquid pump through the heating gas pipeline. Because the sealing pipeline and the heating air pipeline adopt the same air source, the whole maintenance workload is smaller, and the maintenance cost is lower. And because the nitrogen source is adopted, even if the gas in the sealing gas pipeline and the warming gas pipeline rushes into the low-temperature liquid nitrogen storage tank, the purity of the liquid nitrogen in the liquid nitrogen storage tank is not influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of an overall pipeline connection of a liquid nitrogen storage system according to an embodiment of the present invention;
fig. 2 is an overall pipeline connection diagram of the liquid nitrogen storage device provided by the embodiment of the present invention.
Icon: 1-liquid nitrogen storage means; 2-liquid nitrogen storage; 3-a cryogenic liquid pump; 4-sealing the gas pipeline; 5-heating the gas pipeline; 6-nitrogen gas supply pipeline; 7-instrument air duct; 8-installing an air supply duct; 9-Nitrogen main.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Example (b):
referring to fig. 1 and 2, the present embodiment provides a liquid nitrogen storage 2 system, which includes two liquid nitrogen storage 2 devices 1 connected in parallel; the liquid nitrogen storage 2 device 1 comprises a liquid nitrogen storage tank, a low-temperature liquid pump 3, a sealing gas pipeline 4, a heating gas pipeline 5, a nitrogen gas supply pipeline 6 and a nitrogen gas source. The low-temperature liquid pump 3 is connected with the liquid nitrogen storage tank and is used for pressurizing and delivering the liquid nitrogen in the liquid nitrogen storage tank; the seal gas pipeline 4 is connected with the cryogenic liquid pump 3 and used for providing seal gas for the cryogenic liquid pump 3. The heating gas pipeline 5 is communicated with a liquid outlet pipeline of the low-temperature liquid pump 3 and is used for providing heating gas for the low-temperature liquid pump 3. The sealing gas pipeline 4 and the heating gas pipeline 5 are both communicated with a nitrogen gas supply pipeline 6; the nitrogen gas supply pipeline 6 is connected with a nitrogen gas source, so that the gases in the heating gas pipeline 5 and the sealing gas pipeline 4 are nitrogen gas.
Specifically, the liquid nitrogen storage tank is a sealed low temperature and normal pressure resistant tank body, the cryogenic liquid pump 3 is arranged outside the tank body, the cryogenic liquid pump 3 is connected with a liquid outlet pipe, and the liquid outlet pipe is connected with equipment outside the liquid nitrogen storage tank. The relevant instruments on the cryogenic liquid pump 3 are arranged outside the liquid nitrogen storage 2 and are connected to the cryogenic liquid pump 3 by means of a connecting tube. The purity of the nitrogen in the liquid nitrogen storage 2 was 99.99%, and its temperature was-190 ℃.
In order to preheat nitrogen in a liquid outlet pipe of the low-temperature liquid pump 3 before maintenance, a heating gas pipeline 5 is connected to the liquid outlet pipe; in order to seal the cryogenic liquid pump 3, a seal gas pipe 4 is connected to a connection pipe between the meter and the cryogenic liquid pump 3. The nitrogen gas supply pipe is connected to the heating gas pipe 5 and the sealing gas pipe 4 at the same time, so that nitrogen gas can be supplied to both pipes at the same time.
Further, the device 1 for storing 2 liquid nitrogen further comprises an instrument air supply pipeline and a device air supply pipeline 8, the sealing air pipeline 4 is communicated with the instrument air supply pipeline, and the device air supply pipeline 8 is communicated with the heating air pipeline 5. And, the instrument air supply duct communicates with an instrument air source, and the device air supply duct 8 communicates with a device air source. In addition, the instrument air and the device air both adopt air with the oxygen content of 20.9 percent and the temperature of 25 ℃.
In addition, the instrument air supply pipeline, the device air supply pipeline 8 and the nitrogen gas supply pipeline 6 are all provided with stop valves, so that the pipelines can be selectively switched on and off, and the low-temperature liquid nitrogen pump adopts double-sealing gas and double-heating gas. In addition, the instrument gas pipeline and the warming gas pipeline 5 are isolated by a blind plate, and gas is prevented from flowing into each other.
Further, the nitrogen gas supply pipeline 6, the instrument air supply pipeline and the device air supply pipeline 8 are all provided with a pressure detection element and a stop valve. The liquid nitrogen storage 2 device 1 is also provided with a controller, and the controller adopts a PLC. The controller is simultaneously in communication connection with the pressure detection element and the stop valve on the pipeline, so that the gas pressure in the pipeline can be monitored in real time and the on-off of the pipeline can be controlled. Since the controller can be purchased directly, it will not be described in detail.
In addition, the cryogenic liquid pump 3 is also provided with an emptying pipeline which extends to the outside of the liquid nitrogen storage tank and is used for emptying gas in the cryogenic liquid nitrogen pump; the emptying pipeline is also provided with a control valve.
The liquid nitrogen storage 2 system in the embodiment comprises a nitrogen main pipe 9 and two liquid nitrogen storage 2 devices 1, wherein the nitrogen main pipe 9 is communicated with a nitrogen gas supply pipeline 6 of the liquid nitrogen storage 2 device 1; so that the two liquid nitrogen storage devices 2 connected in parallel share one nitrogen main pipe 9, and the nitrogen main pipe 9 is communicated with a nitrogen source.
It should be noted that this embodiment provides one of many embodiments in this application, and in other embodiments, the liquid nitrogen storage 2 system may include a plurality of liquid nitrogen storage 2 devices 1, such as 3 or 4. Also, in other embodiments, the instrument air supply duct and the device air supply duct 8 may be eliminated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A liquid nitrogen storage device is characterized by comprising a liquid nitrogen storage tank, a low-temperature liquid pump, a sealed gas pipeline, a heating gas pipeline, a nitrogen gas supply pipeline and a nitrogen gas source; the low-temperature liquid pump is connected with the liquid nitrogen storage tank and is used for pressurizing and delivering the liquid nitrogen in the liquid nitrogen storage tank;
the sealing gas pipeline is connected with the cryogenic liquid pump and used for providing sealing gas for the cryogenic liquid pump; the heating gas pipeline is communicated with a liquid outlet pipeline of the low-temperature liquid pump and is used for providing heating gas for the low-temperature liquid pump; the sealing gas pipeline and the heating gas pipeline are both communicated with the nitrogen gas supply pipeline; the nitrogen gas supply pipeline is connected with the nitrogen gas source.
2. The liquid nitrogen storage device of claim 1, further comprising an instrument air supply duct and a device air supply duct; the sealed air pipeline is communicated with the instrument air supply pipeline, and the device air supply pipeline is communicated with the heating air pipeline.
3. The liquid nitrogen storage device of claim 2, wherein stop valves are disposed on the nitrogen gas supply line, the instrument air supply line and the device air supply line.
4. The liquid nitrogen storage device of claim 3, further comprising a controller, wherein the controller is in communication with the stop valves on the nitrogen gas supply line, the instrument air supply line and the device air supply line simultaneously, and is configured to control the opening and closing of the stop valves.
5. The liquid nitrogen storage device of claim 2, wherein pressure detection elements are disposed on the nitrogen gas supply line, the instrument air supply line and the device air supply line.
6. The liquid nitrogen storage device according to claim 1, wherein said cryogenic liquid pump is disposed outside said liquid nitrogen storage tank.
7. The liquid nitrogen storage device of claim 1, further comprising an evacuation conduit in communication with the cryogenic liquid pump; and the emptying pipeline is provided with a control valve.
8. A liquid nitrogen storage system comprising a nitrogen main and at least two liquid nitrogen storage devices according to any one of claims 1 to 7; the nitrogen main pipe is communicated with a nitrogen gas supply pipeline of the liquid nitrogen storage device.
9. The liquid nitrogen storage system of claim 8, wherein a control valve and a pressure sensing element are disposed on said nitrogen main.
10. An air separation system, characterized by comprising the liquid nitrogen storage apparatus according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020251174.6U CN211821749U (en) | 2020-03-04 | 2020-03-04 | Liquid nitrogen storage device, system and air separation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020251174.6U CN211821749U (en) | 2020-03-04 | 2020-03-04 | Liquid nitrogen storage device, system and air separation system |
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| Publication Number | Publication Date |
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| CN211821749U true CN211821749U (en) | 2020-10-30 |
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| CN202020251174.6U Active CN211821749U (en) | 2020-03-04 | 2020-03-04 | Liquid nitrogen storage device, system and air separation system |
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