Nitrogen emptying and recycling system

Abstract

The utility model relates to the field of nitrogen recovery, in particular to a nitrogen emptying recovery system. Comprising a first container used for storing liquid nitrogen, and the first container is connected with an on-site emptying pipeline; the second container is used for storing high-purity nitrogen; the gasifier is connected with the first container through a first pipeline, and the gasifier is connected with the second container through a second pipeline; and one end of the third pipeline is connected with the first pipeline, and the other end of the third pipeline is connected with the on-site emptying pipeline. According to a passage provided by the third pipeline of the device, high-purity nitrogen after liquid nitrogen gasification in the on-site emptying pipeline in a continuous open state is recycled into the second container, a large amount of waste of high-purity nitrogen resources is avoided, meanwhile, due to the fact that the on-site emptying pipeline is directly connected into the first pipeline, a passage for discharging low-temperature high-purity nitrogen into the outside is cut off, and the low-temperature high-purity nitrogen is discharged into the second container. Therefore, potential safety hazards caused by low-temperature high-purity nitrogen to operators are eliminated.

Description

Technical Field

[0001] The utility model relates to the field of nitrogen recovery, and particularly relates to a nitrogen vent recovery system. Background Art

[0002] During the process of transporting liquid nitrogen to a liquid nitrogen storage tank, there will be a situation where liquid nitrogen gasifies into high-purity nitrogen and the gasification speed is relatively fast, thereby increasing the pressure in the pipeline for transporting liquid nitrogen and the liquid nitrogen storage tank. For the safety of the equipment and pipeline system, corresponding pressure relief measures need to be taken. In the prior art, a local vent pipeline is usually connected in parallel to the nitrogen pipeline connected to the liquid nitrogen storage tank to achieve the purpose of pressure relief and ensure that the equipment and pipeline system are in a normal pressure environment.

[0003] However, the inventor found that the prior art has the following deficiencies. On the one hand, since high-purity nitrogen is produced after the gasification of liquid nitrogen, if it is directly discharged into the atmosphere through the local vent pipeline, it will undoubtedly cause a large waste of high-purity nitrogen resources. On the other hand, since the gasification process of liquid nitrogen absorbs heat, the high-purity nitrogen after gasification is in a low-temperature state. The long-term local venting of the low-temperature high-purity nitrogen poses certain safety hazards to the on-site operators. On the other hand, when the nitrogen pipeline and the liquid nitrogen storage tank are in a high-pressure state, during the process of pressure relief through the local vent pipeline, the high-purity nitrogen flows too fast under the drive of high pressure, resulting in huge noise pollution. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a nitrogen vent recovery system to solve the technical problems of reducing the waste of high-purity nitrogen resources, reducing the safety hazards existing in the liquid nitrogen transportation process, and improving noise pollution in the background art.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A nitrogen vent recovery system of the utility model includes:

[0007] A first container for storing liquid nitrogen, and the first container is connected to a local vent pipeline;

[0008] A second container for storing high-purity nitrogen;

[0009] A vaporizer, the vaporizer is connected to the first container through a first pipeline, and the vaporizer is connected to the second container through a second pipeline;

[0010] It further includes a third pipeline, one end of the third pipeline is connected to the first pipeline, and the other end is connected to the local vent pipeline.

[0011] As a further improvement, it further includes a safety valve group pipeline, and the safety valve group pipeline is arranged on the first pipeline.

[0012] As a further improvement, a first switch unit is provided on the first pipeline, and the first switch unit is arranged between the pipeline of the safety valve group and the first container.

[0013] As a further improvement, a second switch unit is provided on the first pipeline, and the second switch unit is arranged between the pipeline of the safety valve group and the third pipeline.

[0014] As a further improvement, a third switch unit is provided on the first pipeline, and the third switch unit is arranged between the third pipeline and the vaporizer.

[0015] As a further improvement, a heater is further included, and the heater is arranged on the second pipeline.

[0016] As a further improvement, a control unit is further included, and the control unit is connected to the pressure sensor, wherein the pressure sensor is arranged on the first container to detect the pressure value of the first container.

[0017] As a further improvement, a fourth pipeline is further included, one end of the fourth pipeline is connected to the third pipeline, and the other end is connected to the second container.

[0018] As a further improvement, a fourth switch unit is provided on the third pipeline.

[0019] As a further improvement, a fifth switch unit is provided on the fourth pipeline.

[0020] The utility model has achieved the following technical effects compared with the prior art:

[0021] The first container, the second container, the first pipeline, the second pipeline and the third pipeline are arranged in the utility model; the first container is used for storing liquid nitrogen, the second container is used for storing high-purity nitrogen, and the passage provided by the third pipeline recovers the high-purity nitrogen after the liquid nitrogen is vaporized in the in-situ vent pipeline in a continuously open state to the second container, avoiding a large amount of waste of high-purity nitrogen resources. At the same time, since the in-situ vent pipeline is directly connected to the first pipeline, the channel for discharging the low-temperature high-purity nitrogen to the outside is cut off, thereby eliminating the safety hazard brought by the low-temperature high-purity nitrogen to the operators. Moreover, the third pipeline and the original first pipeline cooperate to complete the transportation work at the same time, reducing the transportation pressure of a single pipeline, and further reducing the flow rate of the high-purity nitrogen during transportation. And since the third pipeline seals the high-purity nitrogen inside, it plays a certain role in blocking and energy attenuation of sound, so that the sound will not be directly transmitted through the external air medium, thereby reducing the noise and improving the noise pollution problem. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of a nitrogen vent recovery system according to an embodiment of the present application;

[0023] Figure 2 Schematic diagram of the nitrogen vent recovery system according to another embodiment of the present application.

[0024] Reference numerals: 1, first container; 2, second container; 3, vaporizer; 4, first pipeline; 41, safety valve group pipeline; 42, first switch unit; 43, second switch unit; 44, third switch unit; 5, second pipeline; 6, third pipeline; 61, fourth switch unit; 7, fourth pipeline; 71, fifth switch unit. Detailed implementation manners

[0025] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application. On the contrary, the embodiments of the present application include all changes, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0026] The examples of the present application will be described in detail below. The examples of the examples are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The examples described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as a limitation to the present application.

[0027] Embodiment 1

[0028] As Figure 1 shown, a nitrogen vent recovery system of the present utility model includes: a first container 1 for storing liquid nitrogen, and the first container 1 is connected to the local vent pipeline; a second container 2 for storing high-purity nitrogen; a vaporizer 3, the vaporizer 3 is connected to the first container 1 through a first pipeline 4, and the vaporizer 3 is connected to the second container 2 through a second pipeline 5; it further includes a third pipeline 6, one end of the third pipeline 6 is connected to the first pipeline 4, and the other end is connected to the local vent pipeline.

[0029] In the embodiment, the first container 1 is used to store liquid nitrogen. The first container 1 can be a vertical liquid nitrogen storage tank, a horizontal liquid nitrogen storage tank, or a liquid nitrogen storage set composed of multiple liquid nitrogen storage barrels. The specific form is not limited, and one of them can be selected according to the specific use scenario.

[0030] In the embodiment, the second container 2 is used to store high-purity nitrogen. It can be a vertical high-purity nitrogen storage tank, a horizontal high-purity nitrogen storage tank, or a high-purity nitrogen storage set composed of multiple high-purity nitrogen storage barrels. The specific form is not limited, and one of them can be selected according to the specific use scenario.

[0031] In the embodiment, the vaporizer 3 uses an air-cooled vaporizer well-known to those skilled in the art. The specific model and performance parameters are selected according to the actual production needs and are not limited. One end of the first container 1 is connected to one end of a local vent pipe (not shown in the figure). The local vent pipe is continuously connected to the first container 1 to relieve the pressure of the first container 1 and ensure that the first container 1 stores liquid nitrogen safely under a suitable pressure environment.

[0032] Both ends of the first pipeline 4 are respectively connected to the first container 1 and the vaporizer 3, thus forming a passage for transporting liquid nitrogen to the vaporizer 3. Manual or automatic temperature measuring elements, pressure measuring elements, etc. can be installed on the first pipeline 4 to detect the operating state of the first pipeline 4 as required or in real time. In addition, a certain number of high-level vent pipes can be set on the first pipeline 4 according to the piping position and situation to discharge non-condensable gases, impurities, harmful substances, etc. existing in the liquid nitrogen flowing in the first pipeline 4. A safety valve can also be considered to be set on the first pipeline 4 to ensure the safe operation of the system.

[0033] One end of the additional third pipeline 6 in the embodiment is connected to the first pipeline 4, and the other end is connected to the local vent pipe. Since the local vent pipe is in a continuously open state during operation, the high-purity nitrogen gas generated by the vaporization of liquid nitrogen is inevitably discharged into the external atmosphere, resulting in waste of resources. In this application, the outlets of the original local vent pipe are connected through the third pipeline 6 to the first pipeline 4, the vaporizer 3, and then to the second container 2 through the second pipeline for storage and collection, ensuring the recycling of resources.

[0034] In the embodiment, the safety valve group pipeline 41 can monitor the pressure of the first pipeline 4. By setting the lifting pressure value of the safety valve in the safety valve group pipeline 41, the safe production of the system is ensured. Since the third pipeline 6 and the connected local vent pipe mainly pass high-purity nitrogen gas, the safety valve group pipeline 41 is set between the connection position of the first container 1 and the third pipeline 6 and the first pipeline 4 to monitor the pressure value of the first pipeline 4 and ensure its normal operation.

[0035] In the embodiment, the first switch unit 42 determines whether the first container 1 outputs liquid nitrogen to the vaporizer 3. Therefore, the first switch unit 42 can be selected in the form of a single gate valve structure or a valve group including gate valves. The specific valve model specifications are not limited. It should be noted that considering the low-temperature environment of the system during the transportation of liquid nitrogen and high-purity nitrogen gas, the above-mentioned valves can be selected as low-temperature valves with appropriate parameters.

[0036] In the embodiment, the function of the second switch unit 43 is that when the pressure value of the first pipeline 4 is monitored by the safety valve pipeline 41 to exceed the preset starting pressure value, the safety valve pipeline 41 is closed, and the second switch unit 43 can close and cut off the passage of liquid nitrogen delivered to the vaporizer 3, while enabling the system to normally carry out the high-purity nitrogen recovery work of the third pipeline; it should be noted that considering that the system is in a low-temperature environment during the liquid nitrogen delivery and high-purity nitrogen delivery processes, the valves mentioned above can be various low-temperature valves with appropriate parameters.

[0037] In the embodiment, the function of the third switch unit 44 is to cut off the output passage of the first pipeline 4 to the vaporizer 3 and cut off the recovery of high-purity nitrogen in the third pipeline when necessary; it should be noted that considering that the system is in a low-temperature environment during the liquid nitrogen delivery and high-purity nitrogen delivery processes, the valves mentioned above can be various low-temperature valves with appropriate parameters.

[0038] Both ends of the second pipeline 5 are respectively connected to the vaporizer 3 and the second container 2, thus forming a passage for liquid nitrogen to be stored as high-purity nitrogen in the second container 2 through the vaporizer 3. Manual or automatic temperature measuring elements, pressure measuring elements, etc. can be installed on the second pipeline 5 to detect the operating state of the second pipeline 5 as required or in real time; in addition, a certain number of high-level vent pipelines can be set on the first pipeline 4 according to the piping position and situation to discharge impurities and harmful substances in the high-purity nitrogen flowing in the second pipeline 5. Safety valves can also be installed at the outlet position close to the vaporizer 3 and at the inlet position close to the second container 2. It should be noted that considering that the system is in a low-temperature environment during the liquid nitrogen delivery and high-purity nitrogen delivery processes, the valves mentioned above can be various low-temperature valves with appropriate parameters.

[0039] In the embodiment, in order to further improve the vaporization efficiency and provide the injection amount of the second pipeline 5 injected into the vaporizer 3 per unit time, the device is also provided with a heater, which can be in the form of a water bath heater, a steam heater, etc., to realize the heating of the medium flowing in the second pipeline 5 and thus accelerate the vaporization efficiency.

[0040] The embodiment also includes a control unit. The first container 1 is provided with a pressure sensor for detecting the pressure value of the first container 1. The pressure sensor is connected to the control unit, and the control unit controls the opening or closing of the first switch unit 42 according to the pressure value.

[0041] The automatic control of this device is achieved through the settings of the control unit and the pressure sensor. Under normal conditions, the first switch unit 42, the second switch unit 43, and the third switch unit 44 are all in the open state. When it is detected that the pressure value exceeds the preset safety pressure value of the first container 1, the first switch unit 42 is controlled to close, so that the third pipeline 6 and the first pipeline 4 behind the first switch unit 4 form a new path into the vaporizer 3. The safety valve group pipeline connected to the front end of the second switch unit 43 detects the pressure of the high-purity nitrogen in the new path to maintain the normal operation of the system. Example 2

[0042] This embodiment is basically the same as Embodiment 1, except that it further includes a fourth pipeline 7, one end of which is connected to the third pipeline 6 and the other end is connected to the second container 2.

[0043] In order to reduce the conveying pressure of the high-purity nitrogen discharged by the third pipeline 6 alone to the local vent pipeline, this device is also provided with a fourth pipeline 7. One end of the fourth pipeline 7 is connected to the third pipeline 6, and the other end of the fourth pipeline 7 is connected to the second container 2, so that this device forms a path for recovering high-purity nitrogen simultaneously by the fourth pipeline 7 and the third pipeline 6 with the local discharge pipeline as the output source. The installation position of the fourth pipeline 7 is adjusted according to the actual piping situation. It should be noted that when the fourth pipeline 7 is connected, the requirements for the pipeline pressure parameters of the third pipeline 6 are appropriately reduced, and data such as the material and diameter of the pipeline can be appropriately adjusted.

[0044] In the embodiment, a fourth switch unit 61 is provided on the third pipeline 6. A fifth switch unit 71 is provided on the third pipeline 6. In order to be able to manually control the opening and closing of the third pipeline 6 and the fourth pipeline 7, this device is also provided with a fourth switch unit 61 on the third pipeline 6 and a fifth switch unit 71 on the fourth pipeline 7. The specific forms of the fourth unit switch and the fifth switch unit 71 are selected according to the actual process requirements. It should be noted that considering that the system is in a low-temperature environment during the liquid nitrogen transportation and high-purity nitrogen transportation processes, the fourth unit switch unit 61 and the fifth switch unit 71 can be selected from various low-temperature valves with appropriate parameters.

[0045] It should be noted that in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0046] Any process or method description depicted in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations where functions may be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0047] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0048] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A nitrogen venting and recovery system, characterized in that: include: A first container for storing liquid nitrogen, wherein the first container is connected to an on-site venting pipeline; A second container for storing high-purity nitrogen; A vaporizer, wherein the vaporizer is connected to the first container via a first pipeline, and the vaporizer is connected to the second container via a second pipeline; It also includes a third pipeline, one end of which is connected to the first pipeline, and the other end of which is connected to the on-site venting pipeline.

2. A nitrogen venting and recovery system according to claim 1, characterized in that: It also includes a safety valve group pipeline, which is arranged on the first pipeline.

3. A nitrogen venting and recovery system according to claim 2, characterized in that: The first pipeline is provided with a first switch unit, and the first switch unit is arranged between the safety valve group pipeline and the first container.

4. A nitrogen venting and recovery system according to claim 1, characterized in that: The first pipeline is provided with a second switch unit, and the second switch unit is arranged between the safety valve group pipeline and the third pipeline.

5. A nitrogen venting and recovery system according to claim 1, characterized in that: The first pipeline is provided with a third switch unit, and the third switch unit is provided between the third pipeline and the gasifier.

6. A nitrogen venting and recovery system according to claim 1, characterized in that: The device also includes a heater, which is arranged on the second pipe.

7. A nitrogen venting and recovery system according to claim 1, characterized in that: It also includes a control unit, which is connected to a pressure sensor, wherein the pressure sensor is arranged on the first container and is used to detect the pressure value of the first container.

8. A nitrogen venting and recovery system according to any one of claims 1 to 7, characterized in that: It also includes a fourth pipeline, one end of which is connected to the third pipeline, and the other end of which is connected to the second container.

9. A nitrogen venting and recovery system according to claim 8, characterized in that: The third pipeline is provided with a fourth switch unit.

10. A nitrogen venting and recovery system according to claim 8, characterized in that: The fourth pipeline is provided with a fifth switch unit.

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