Backup nitrogen system and air separation device

Abstract

The utility model discloses a backup nitrogen system and an air separation unit, and relates to the technical field of air separation, the backup nitrogen system comprises a nitrogen storage tank, a gasifier, a buffer tank, an instrument gas main pipeline, a heating gas main pipeline, a first pipeline bridging assembly, a steam turbine isolation gas pipeline and a supercharger sealing gas pipeline; the gasifier is communicated with the liquid nitrogen storage tank; the buffer tank is communicated with the gasifier; the buffer tank is communicated with an instrument gas main pipeline; the first pipeline crossover assembly comprises a first pipeline crossover pipe and a first pipeline crossover valve, the first pipeline crossover pipe is used for communicating the instrument gas main pipeline with the heating gas main pipeline, and the first pipeline crossover valve is arranged on the first pipeline crossover pipe; the steam turbine isolation gas pipeline is communicated with the instrument gas main pipeline; the supercharger sealing gas pipeline is communicated with the instrument gas main pipeline; according to the technical scheme provided by the utility model, the instrument gas, the heating gas and the sealing gas can be provided in time when the air separation device is shut down accidentally.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation, in particular to a backup nitrogen system and an air separation device. Background Art

[0002] The air separation unit is a set of industrial equipment used to separate the various gas components in the air and produce oxygen, nitrogen, argon and other gases of the air components. In the air separation unit, instrument gas, heating gas and sealing gas are indispensable. In the relevant technology, the instrument gas, heating gas and sealing gas of the air separation unit are provided by molecular sieves through pipelines. However, when the air separation unit is shut down unexpectedly, the molecular sieve no longer provides instrument gas, heating gas and sealing gas, which will cause pollution or damage to various equipment of the air separation unit. Therefore, it is very important to provide instrument gas, heating gas and sealing gas in time when the air separation unit is shut down unexpectedly. Utility Model Content

[0003] The main purpose of the utility model is to provide a backup nitrogen system and an air separation device, aiming at timely providing instrument gas, heating gas and sealing gas when the air separation device is unexpectedly shut down.

[0004] To achieve the above purpose, the backup nitrogen system proposed by the utility model includes:

[0005] Liquid nitrogen storage tanks;

[0006] A vaporizer, wherein an input end of the vaporizer is connected to an output end of the liquid nitrogen storage tank through a pipeline;

[0007] A buffer tank, wherein an input end of the buffer tank is connected to an output end of the gasifier through a pipeline;

[0008] An instrument gas main pipeline, the instrument gas main pipeline is used to communicate with the instrument gas outlet of the molecular sieve of the air separation device, and the output end of the buffer tank is connected to the instrument gas main pipeline;

[0009] A heating gas main pipeline, the heating gas main pipeline is used to communicate with the heating gas outlet of the molecular sieve of the air separation device;

[0010] A first pipeline jumper assembly, the first pipeline jumper assembly comprising a first pipeline jumper tube and a first pipeline jumper valve, the first pipeline jumper tube is used to connect the instrument gas main pipeline and the heating gas main pipeline, and the first pipeline jumper valve is arranged on the first pipeline jumper tube;

[0011] a steam turbine isolation gas pipeline, the steam turbine isolation gas pipeline being in communication with the instrument gas main pipeline; and

[0012] The supercharger sealed air pipeline is connected to the instrument air main pipeline.

[0013] In one embodiment, the backup nitrogen system also includes a second pipeline jumper assembly, which includes a second pipeline jumper tube and a second pipeline jumper valve. The second pipeline jumper valve is arranged on the second pipeline jumper tube, one end of the second pipeline jumper tube is connected to the heating gas main pipeline, and the other end of the second pipeline jumper tube is used to connect to the protective gas main pipeline of the air separation unit.

[0014] In one embodiment, the backup nitrogen system further includes a booster valve, and the booster valve is disposed at the output end of the liquid nitrogen storage tank.

[0015] In one embodiment, the backup nitrogen system further comprises a first safety valve, which is arranged on a pipeline between the liquid nitrogen storage tank and the vaporizer; and / or

[0016] The backup nitrogen system further includes a first discharge valve, which is arranged on a pipeline between the liquid nitrogen storage tank and the vaporizer.

[0017] In one embodiment, the backup nitrogen system further comprises a heater, an input end of the heater is connected to an output end of the gasifier via a pipeline, and an output end of the heater is connected to an input end of the buffer tank via a pipeline.

[0018] In one embodiment, the backup nitrogen system further comprises a second safety valve, which is disposed on a pipeline between the heater and the buffer tank; and / or

[0019] The backup nitrogen system further includes a second discharge valve, which is disposed on a pipeline between the heater and the buffer tank.

[0020] In one embodiment, the backup nitrogen system further includes a self-operated pressure reducing valve, and the self-operated pressure reducing valve is disposed at the input end of the buffer tank.

[0021] In one embodiment, the vaporizer is an air bath vaporizer.

[0022] In one embodiment, the backup nitrogen system further includes a remote pressure gauge, and the remote pressure gauge is arranged on the instrument gas main pipeline.

[0023] The utility model also provides an air separation device, which includes the backup nitrogen system as described above.

[0024] In the technical solution of the utility model, the liquid nitrogen in the liquid nitrogen storage tank is converted into nitrogen after passing through the vaporizer, and is buffered in the buffer tank to provide stable nitrogen to the instrument gas main pipeline. When the air separation unit is unexpectedly shut down, the nitrogen discharged from the buffer tank can provide instrument gas for various equipment of the air separation unit through the instrument gas main pipeline to ensure the normal operation of the equipment, and enter the turbine isolation gas pipeline and the supercharger sealing gas pipeline to ensure the safe shutdown of the turbine and the supercharger. At the same time, by opening the first pipeline jumper valve, the backup nitrogen system can provide heating gas for various equipment of the air separation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of an embodiment of a backup nitrogen system provided by the utility model;

[0027] Figure 2 This is the connection diagram of the instrument gas main pipeline;

[0028] Figure 3 This is a connection diagram for the heating gas main pipeline and the protective gas main pipeline.

[0029] Description of Figure Numbers:

[0030] 100. Backup nitrogen system; 1. Liquid nitrogen storage tank; 2. Vaporizer; 3. Buffer tank; 4. Instrument gas main pipeline; 5. Heating gas main pipeline; 6. First pipeline jumper valve; 7. Turbine isolation gas pipeline; 8. Supercharger sealing gas pipeline; 9. Second pipeline jumper valve; 10. Protective gas main pipeline; 11. Booster valve; 12. First safety valve; 13. First discharge valve; 14. Heater; 15. Second safety valve; 16. Second discharge valve; 17. Self-operated pressure reducing valve; 18. Remote pressure gauge; 19. Expander reflux valve instrument gas pipeline; 20. Expander instrument gas pipeline; 21. Liquid oxygen pump cold box instrument gas pipeline; 22. Cold box instrument gas pipeline; 23. Purification and regeneration system instrument gas pipeline; 24. Precooling system instrument gas pipeline; 25. Purification system instrument gas pipeline; 26. Compressor instrument gas pipeline; 27, steam turbine auxiliary instrument gas pipeline; 28, bypass filter instrument gas pipeline; 29, liquid nitrogen tank area instrument gas pipeline; 30, liquid oxygen pipe area instrument gas pipeline; 31, liquid argon tank area instrument gas pipeline; 32, analysis room chromatograph gas pipeline; 33, circulating oxygen pump A heating gas pipeline; 34, circulating oxygen pump B heating gas pipeline; 35, low temperature expander heating gas pipeline; 36, low temperature expander heating gas pipeline Line; 37, argon system heating gas pipeline; 38, liquid argon tank area heating gas pipeline; 39, liquid nitrogen tank area heating gas pipeline; 40, liquid oxygen tank area heating gas pipeline; 41, circulating oxygen pump interlayer protection gas pipeline; 42, cold box interlayer protection gas pipeline; 43 expander cold box interlayer gas protection pipeline; 44, oxygen tank protection gas pipeline; 45, nitrogen tank protection gas pipeline; 46, argon tank protection gas pipeline; 47, molecular sieve.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] 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 of 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.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] The utility model provides a backup nitrogen system 100 .

[0036] See also Figures 1 to 3 In one embodiment of the utility model, the backup nitrogen system 100 includes a nitrogen storage tank, a vaporizer 2, a buffer tank 3, an instrument gas main pipeline 4, a heating gas main pipeline 5, a first pipeline jumper assembly, a turbine isolation gas pipeline 7 and a supercharger sealing gas pipeline 8; the input end of the vaporizer 2 is connected to the output end of the liquid nitrogen storage tank 1 through a pipeline; the input end of the buffer tank 3 is connected to the output end of the vaporizer 2 through a pipeline; the instrument gas main pipeline 4 is used to connect to the instrument gas outlet of the molecular sieve 47 of the air separation unit The output end of the buffer tank 3 is connected with the instrument gas main pipeline 4; the heating gas main pipeline 5 is used to be connected with the heating gas outlet of the molecular sieve 47 of the air separation unit; the first pipeline jumper assembly includes a first pipeline jumper tube and a first pipeline jumper valve 6, the first pipeline jumper tube is used to connect the instrument gas main pipeline 4 and the heating gas main pipeline 5, and the first pipeline jumper valve 6 is arranged on the first pipeline jumper tube; the turbine isolation gas pipeline 7 is connected with the instrument gas main pipeline 4; the booster sealing gas pipeline 8 is connected with the instrument gas main pipeline 4.

[0037] Among them, see Figure 2 The instrument gas main pipeline 4 is connected with the pipelines of various equipments of the air separation unit, including the expander reflux valve instrument gas pipeline 19, the expander instrument gas pipeline 20, the liquid oxygen pump cold box instrument gas pipeline 21, the cold box instrument gas pipeline 22, the purification and regeneration system instrument gas pipeline 23, the precooling system instrument gas pipeline 24, the purification system instrument gas pipeline 25, the compressor instrument gas pipeline 26, the turbine auxiliary instrument gas pipeline 27, the bypass filter instrument gas pipeline 28, the liquid nitrogen tank area instrument gas pipeline 29, the liquid oxygen pipe area instrument gas pipeline 30, the liquid argon tank area instrument gas pipeline 31, the analysis room chromatograph gas pipeline 32, etc.

[0038] See also Figure 3The heating gas main pipeline 5 is connected with the pipelines of various equipment in the air separation unit, including the heating gas pipeline of the circulating oxygen pump A, the heating gas pipeline of the circulating oxygen pump B, the heating gas pipeline of the cryogenic expander 3536, the heating gas pipeline of the cryogenic expander 3536, the heating gas pipeline of the argon system 37, the heating gas pipeline of the liquid argon tank area 38, the heating gas pipeline of the liquid nitrogen tank area 39, the heating gas pipeline of the liquid oxygen tank area 40, etc.

[0039] In the technical solution of the utility model, the liquid nitrogen in the liquid nitrogen storage tank 1 is converted into nitrogen after passing through the vaporizer 2, and is buffered by the buffer tank 3 to provide stable nitrogen to the instrument gas main pipeline 4. When the air separation device is unexpectedly shut down, the nitrogen discharged from the buffer tank 3 can provide instrument gas for various equipment of the air separation device through the instrument gas main pipeline 4 to ensure the normal operation of the equipment, and enter the turbine isolation gas pipeline 7 and the supercharger sealing gas pipeline 8 to ensure the safe shutdown of the turbine and the supercharger. At the same time, by opening the first pipeline jumper valve 6, the backup nitrogen system 100 can provide heating gas for various equipment of the air separation device.

[0040] During the normal operation of the air separation unit, the dirty nitrogen gas is used to provide protective gas for each device of the air separation unit through the protective gas main pipeline 10, so as to reduce the use cost. However, when the air separation unit stops unexpectedly, the supply of dirty nitrogen gas will be stopped. For this reason, in one embodiment of the utility model, please refer to Figure 1 and Figure 3 The backup nitrogen system 100 also includes a second pipeline jumper assembly, which includes a second pipeline jumper tube and a second pipeline jumper valve 9. The second pipeline jumper valve 9 is arranged on the second pipeline jumper tube. One end of the second pipeline jumper tube is connected to the heating gas main pipeline 5, and the other end of the second pipeline jumper tube is used to connect to the protection gas main pipeline 10 of the air separation unit. In this way, when the air separation unit is unexpectedly shut down, by opening the first pipeline jumper valve 6 and the second pipeline jumper valve 9, the backup nitrogen system 100 can provide nitrogen as protection gas to the protection gas main pipeline 10 through the instrument gas main pipeline 4 and the heating gas main pipeline 5, so as to ensure the safety of the air separation unit. Among them, the protection gas main pipeline 10 is connected to the circulating oxygen pump interlayer protection gas pipeline 41, the cold box interlayer protection gas pipeline 42, the expander cold box interlayer gas protection pipeline 43, the oxygen tank protection gas pipeline 44, the nitrogen tank protection gas pipeline 45 and the argon tank protection gas pipeline 46.

[0041] Further, in an embodiment of the present utility model, please refer to Figure 1 The backup nitrogen system 100 further includes a booster valve 11, which is disposed at the output end of the liquid nitrogen storage tank 1. After the liquid nitrogen flows out, it is pressurized by the booster valve 11 and then enters the vaporizer 2 to become nitrogen, so as to ensure the pressure of the liquid nitrogen entering the vaporizer 2. A tank outlet valve is disposed on the pipeline between the liquid nitrogen storage tank 1 and the vaporizer 2 to control the flow of the liquid nitrogen.

[0042] Furthermore, in an embodiment of the present invention, please refer to Figure 1 The backup nitrogen system 100 further includes a first safety valve 12, which is disposed on the pipeline between the liquid nitrogen storage tank 1 and the vaporizer 2; the backup nitrogen system 100 further includes a first discharge valve 13, which is disposed on the pipeline between the liquid nitrogen storage tank 1 and the vaporizer 2. The first safety valve 12 and the first discharge valve 13 can protect the pipeline, thereby improving the safety of the backup nitrogen system 100 during use.

[0043] In order to meet the use requirements, in one embodiment of the present utility model, please refer to Figure 1 The backup nitrogen system 100 also includes a heater 14. The input end of the heater 14 is connected to the output end of the vaporizer 2 through a pipeline. The output end of the heater 14 is connected to the input end of the buffer tank 3 through a pipeline. The nitrogen discharged from the vaporizer 2 is heated by the heater 14 to prevent the nitrogen temperature flowing into the instrument gas main pipeline 4 from being too low and unable to be used normally.

[0044] Further, in an embodiment of the present utility model, please refer to Figure 1 The backup nitrogen system 100 further includes a second safety valve 15, which is disposed on the pipeline between the heater 14 and the buffer tank 3; the backup nitrogen system 100 further includes a second discharge valve 16, which is disposed on the pipeline between the heater 14 and the buffer tank 3. The second safety valve 15 and the second discharge valve 16 can protect the pipeline, thereby improving the safety of the backup nitrogen system 100 during use.

[0045] Specifically, in one embodiment of the present invention, please refer to Figure 1 The backup nitrogen system 100 also includes a self-operated pressure reducing valve 17, which is arranged at the input end of the buffer tank 3. The self-operated pressure reducing valve 17 can adjust the outlet pressure of the buffer tank 3 to make it slightly lower than the pressure of the instrument gas provided by the molecular sieve 47. In this way, when the molecular sieve 47 can normally supply the instrument gas, the nitrogen of the backup nitrogen system 100 is not sent out and is in a standby state. When the instrument gas provided by the molecular sieve 47 fluctuates, the backup nitrogen system 100 can play a role in stabilizing the pressure to ensure the normal operation of the air separation unit.

[0046] Furthermore, in one embodiment of the present invention, the vaporizer 2 is an air bath vaporizer 2, and in other embodiments of the present invention, the vaporizer 2 may be a steam heating vaporizer 2, a hot water bath vaporizer 2, a forced ventilation vaporizer 2, an electric heating vaporizer 2, or a solid heat conduction vaporizer 2, etc.

[0047] Specifically, in one embodiment of the present invention, please refer to Figure 1The backup nitrogen system 100 also includes a remote pressure gauge 18, which is arranged on the instrument gas main pipeline 4. The remote pressure gauge 18 can detect the pressure of the instrument gas main pipeline 4 and transmit corresponding information, so as to find problems in time.

[0048] The utility model further provides an air separation device, which includes the above-mentioned backup nitrogen system 100. The specific structure of the backup nitrogen system 100 refers to the above-mentioned embodiment. Since the air separation device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0049] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A backup nitrogen system for an air separation unit, characterized in that: include: Liquid nitrogen storage tanks; A vaporizer, wherein an input end of the vaporizer is connected to an output end of the liquid nitrogen storage tank through a pipeline; A buffer tank, wherein an input end of the buffer tank is connected to an output end of the gasifier through a pipeline; An instrument gas main pipeline, the instrument gas main pipeline is used to communicate with the instrument gas outlet of the molecular sieve of the air separation device, and the output end of the buffer tank is connected to the instrument gas main pipeline; A heating gas main pipeline, the heating gas main pipeline is used to communicate with the heating gas outlet of the molecular sieve of the air separation device; A first pipeline jumper assembly, the first pipeline jumper assembly comprising a first pipeline jumper tube and a first pipeline jumper valve, the first pipeline jumper tube is used to connect the instrument gas main pipeline and the heating gas main pipeline, and the first pipeline jumper valve is arranged on the first pipeline jumper tube; A steam turbine isolation gas pipeline, wherein the steam turbine isolation gas pipeline is connected to the instrument gas main pipeline; as well as The supercharger sealed air pipeline is connected to the instrument air main pipeline.

2. The nitrogen backup system according to claim 1, characterized in that: The backup nitrogen system also includes a second pipeline jumper assembly, which includes a second pipeline jumper tube and a second pipeline jumper valve. The second pipeline jumper valve is arranged on the second pipeline jumper tube. One end of the second pipeline jumper tube is connected to the heating gas main pipeline, and the other end of the second pipeline jumper tube is used to connect to the protective gas main pipeline of the air separation device.

3. The nitrogen backup system according to claim 1, characterized in that: The backup nitrogen system also includes a booster valve, which is arranged at the output end of the liquid nitrogen storage tank.

4. The nitrogen backup system according to claim 1, characterized in that: The backup nitrogen system further comprises a first safety valve, which is arranged on a pipeline between the liquid nitrogen storage tank and the vaporizer; and / or The backup nitrogen system further includes a first discharge valve, which is arranged on a pipeline between the liquid nitrogen storage tank and the vaporizer.

5. The nitrogen backup system according to claim 1, characterized in that: The backup nitrogen system further includes a heater, an input end of the heater is connected to an output end of the gasifier through a pipeline, and an output end of the heater is connected to an input end of the buffer tank through a pipeline.

6. The nitrogen backup system according to claim 5, characterized in that: The backup nitrogen system further comprises a second safety valve, which is arranged on a pipeline between the heater and the buffer tank; and / or The backup nitrogen system further includes a second discharge valve, which is disposed on a pipeline between the heater and the buffer tank.

7. The nitrogen backup system according to claim 1, characterized in that: The backup nitrogen system also includes a self-operated pressure reducing valve, which is arranged at the input end of the buffer tank.

8. The nitrogen backup system according to claim 1, characterized in that: The gasifier is an air bath type gasifier.

9. The nitrogen backup system according to claim 1, characterized in that: The backup nitrogen system also includes a remote pressure gauge, which is arranged on the instrument gas main pipeline.

10. An air separation device, characterized in that: The air separation unit comprises a backup nitrogen system as claimed in any one of claims 1 to 9.

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