CN210764337U - Negative pressure adsorption high-purity nitrogen making device - Google Patents

Negative pressure adsorption high-purity nitrogen making device Download PDF

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CN210764337U
CN210764337U CN201921544363.6U CN201921544363U CN210764337U CN 210764337 U CN210764337 U CN 210764337U CN 201921544363 U CN201921544363 U CN 201921544363U CN 210764337 U CN210764337 U CN 210764337U
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nitrogen
oxygen
pressure
adsorption tower
pipe
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张天来
邓良键
张芸山
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Chengdu Tianlan Chemical Engineering Technology Co ltd
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Abstract

The utility model relates to a field of nitrogen making equipment discloses a high-purity nitrogen making device is adsorbed to negative pressure, including nitrogen gas house steward, voltage-sharing lower extreme house steward, oxygen boosting house steward, air house steward, voltage-sharing upper end house steward, nitrogen gas vacuum pump, nitrogen gas booster compressor, oxygen boosting vacuum pump and four adsorption towers. An adsorbent is arranged in the adsorption tower. Each adsorption tower is communicated with a nitrogen main pipe, a pressure-equalizing lower end main pipe, an oxygen-enriched main pipe, an air main pipe and a pressure-equalizing upper end main pipe through a control valve. The nitrogen vacuum pump and the nitrogen booster compressor are both connected in series to the nitrogen header pipe, and the oxygen-enriched vacuum pump is connected to the oxygen-enriched header pipe. After the air enters the adsorption tower, oxygen and other gases are adsorbed, and negative pressure is formed in the adsorption tower. Meanwhile, the nitrogen booster also enables negative pressure to be formed in the adsorption tower. These all make this device can absorb air by oneself, and need not send the air into the adsorption tower through auxiliary assembly, have simplified the structure, have reduced the energy consumption simultaneously. In addition, oxygen-enriched gas can be obtained and collected during desorption.

Description

Negative pressure adsorption high-purity nitrogen making device
Technical Field
The utility model relates to a field of nitrogen making equipment particularly, relates to a high-purity nitrogen making device is adsorbed to negative pressure.
Background
The pressure swing adsorption nitrogen production uses air as raw material, and utilizes the selective adsorption performance of a high-efficiency and high-selectivity solid adsorbent to nitrogen and oxygen to separate the nitrogen and the oxygen from the air. The separation effect of the carbon molecular sieve on nitrogen and oxygen is mainly based on the fact that the diffusion rates of the two gases on the surface of the carbon molecular sieve are different, oxygen diffuses faster, and more oxygen enters a molecular sieve solid phase. In this way, a nitrogen-enriched fraction is obtained in the gas phase. After a period of time, the adsorption of the molecular sieve to oxygen reaches equilibrium, and according to the characteristic that the carbon molecular sieve adsorbs different gases under different pressures, the pressure is reduced to enable the carbon molecular sieve to remove the adsorption of oxygen, and the process is called regeneration. Pressure swing adsorption processes typically employ two columns in parallel, with alternating pressure adsorption and decompression regeneration to obtain a continuous nitrogen stream.
The pressure swing adsorption nitrogen making machine (PSA nitrogen making machine for short) is a nitrogen gas generator designed and made according to pressure swing adsorption technology, and mainly consists of air compressor, adsorption tower, program control valve and pressing device. The outlet pressure of the compressor is 0.65-0.8MPaG, two adsorption towers are usually connected in parallel, and a full-automatic control system strictly controls the time sequence according to a specific programmable program and alternately performs pressurization adsorption and decompression regeneration to complete the separation of nitrogen and oxygen and obtain the nitrogen with high purity.
The pressure swing adsorption nitrogen making machine in the prior art can only make nitrogen and has single function; meanwhile, the structure is complex, the energy consumption is high, and the purity of the produced nitrogen is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-purity nitrogen plant is adsorbed to negative pressure, it can produce high-purity nitrogen gas and rich oxygen gas, and simple structure energy consumption is low simultaneously.
The embodiment of the utility model is realized like this:
the utility model provides a high-purity nitrogen generator of negative pressure adsorption which characterized by: the device comprises a nitrogen main pipe, a pressure-equalizing lower end main pipe, an oxygen-enriched main pipe, an air main pipe, a pressure-equalizing upper end main pipe, a nitrogen vacuum pump, a nitrogen booster, an oxygen-enriched vacuum pump and four adsorption towers; an adsorbent is arranged in the adsorption tower;
the bottom end of each adsorption tower is communicated with the air main pipe through an air inlet pipe, and the top end of each adsorption tower is communicated with the nitrogen main pipe through an air outlet pipe; each air inlet pipe is provided with an air control valve, and each air outlet pipe is provided with a nitrogen control valve;
a pressure equalizing upper end branch pipe is communicated between each gas outlet pipe and the corresponding adsorption tower and the nitrogen control valve; the pressure-equalizing upper end branch pipes are communicated with the pressure-equalizing upper end main pipe, and each pressure-equalizing upper end branch pipe is provided with a pressure-equalizing upper end control valve; the pressure equalizing upper end main pipe is communicated with the nitrogen main pipe; a final-rise master control valve is arranged at one end, close to the nitrogen main pipe, of the pressure-equalizing upper end main pipe;
an oxygen-enriched branch pipe and a pressure-equalizing lower end branch pipe are communicated between each air inlet pipe and the corresponding adsorption tower and the corresponding air control valve; the oxygen-enriched branch pipes are communicated with the oxygen-enriched main pipe, and each oxygen-enriched branch pipe is provided with an oxygen-enriched control valve; the pressure equalizing lower end branch pipes are communicated with the pressure equalizing lower end header pipe, and each pressure equalizing lower end branch pipe is provided with a pressure equalizing lower end control valve;
the nitrogen vacuum pump and the nitrogen booster are connected in series with the nitrogen header pipe, so that nitrogen produced by the four adsorption towers can be discharged through the nitrogen vacuum pump and the nitrogen booster;
the oxygen-enriched vacuum pump is connected to the oxygen-enriched main pipe, so that oxygen-enriched gas desorbed by the four adsorption towers can be discharged through the oxygen-enriched vacuum pump.
Furthermore, the nitrogen main pipe is also provided with a nitrogen buffer tank, so that nitrogen produced by the four adsorption towers can pass through the nitrogen buffer tank and then is discharged by a nitrogen vacuum pump and a nitrogen booster; the oxygen-enriched main pipe is also provided with an oxygen-enriched buffer tank so that the oxygen-enriched gas desorbed by the four adsorption towers can pass through the oxygen-enriched buffer tank and then is discharged through an oxygen-enriched vacuum pump.
Further, a filter screen is arranged at the air inlet end of the air main pipe.
Further, the bottom layer of the adsorption tower is filled with alumina or silica gel or a 3A molecular sieve; the upper layer of the adsorption tower is provided with a carbon molecular sieve.
Furthermore, the oxygen-enriched control valve, the nitrogen control valve, the pressure-equalizing lower end control valve, the pressure-equalizing upper end control valve, the final-rise main control valve and the air control valve are all controlled by a PLC or a DCS.
Further, the number of the pressure equalizing lower header pipes is 1; and each adsorption tower is communicated with the pressure-equalizing lower end header pipe.
Further, the device also comprises a standby adsorption tower; the standby adsorption tower is connected with the four adsorption towers in parallel.
The utility model has the advantages that:
after the air enters the adsorption tower, gases such as oxygen and the like are all adsorbed by the nitrogen making adsorbent, and only nitrogen passes through the adsorption tower. Since oxygen in the air accounts for 21%, a large amount of gas is adsorbed by the nitrogen making adsorbent, so that a large negative pressure is formed in the adsorption tower, and the air is sucked into the adsorption tower under the action of the negative pressure. Meanwhile, the nitrogen vacuum pump compresses and discharges nitrogen gas to enable negative pressure to be formed in the adsorption tower. These all make the utility model discloses a pressure swing adsorption equipment of negative pressure adsorption nitrogen generation can absorb the air by oneself, and need not send into the adsorption tower with the air through auxiliary assembly such as air-blower, has simplified the structure, has reduced the energy consumption simultaneously.
The utility model discloses a when high-purity nitrogen plant of negative pressure absorption adsorbs, be the negative pressure in the adsorption tower, this has helped nitrogen adsorbent adsorption non-product gas for adsorption effect is better, and then makes the purity of the nitrogen gas that makes higher.
In addition, the utility model discloses a negative pressure adsorbs can obtain and collect oxygen-enriched gas during high-purity nitrogen generator desorption for once can produce two kinds of products.
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 view of the present invention;
fig. 2 is a schematic diagram of the utility model discloses set up reserve adsorption tower.
Icon: 1-air main pipe, 11-air inlet pipe, 111-air control valve, 12-filter screen, 2-nitrogen main pipe, 21-air outlet pipe, 211-nitrogen control valve, 22-nitrogen buffer tank, 3-oxygen enrichment main pipe, 31-oxygen enrichment branch pipe, 311-oxygen enrichment control valve, 32-oxygen enrichment buffer tank, 4-pressure equalizing lower end main pipe, 41-pressure equalizing lower end branch pipe, 411-pressure equalizing lower end control valve, 5-pressure equalizing upper end main pipe, 51-pressure equalizing upper end branch pipe, 511-pressure equalizing upper end control valve, 52-final rising main control valve, 6-nitrogen vacuum pump, 7-nitrogen booster, 8-oxygen enrichment vacuum pump, 9-adsorption tower and 91-standby adsorption tower.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
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 efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
referring to fig. 1, the present embodiment provides a negative pressure adsorption high purity nitrogen production apparatus, which includes a nitrogen header pipe 2, a pressure equalizing lower header pipe 4, an oxygen enrichment header pipe 3, an air header pipe 1, a pressure equalizing upper header pipe 5, a nitrogen vacuum pump 6, a nitrogen booster 7, an oxygen enrichment vacuum pump 8, and four adsorption towers 9. The bottom in the adsorption tower 9 is provided with a drying agent which can be silica gel or alumina or a 3A molecular sieve and is used for adsorbing moisture and carbon dioxide; the upper part in the adsorption tower 9 is provided with a carbon molecular sieve for adsorbing oxygen.
The bottom end of each adsorption tower 9 is communicated with the air main 1 through an air inlet pipe 11, and the top end of each adsorption tower 9 is communicated with the nitrogen main 2 through an air outlet pipe 21. Each of the intake pipes 11 is provided with an air control valve 111 for controlling the intake of air into the adsorption tower 9, and each of the exhaust pipes 21 is provided with a nitrogen control valve 211 for controlling the discharge of nitrogen out of the adsorption tower 9.
A pressure equalizing upper end branch pipe 51 is communicated between each outlet pipe 21 and the corresponding adsorption tower 9 and nitrogen control valve 211. The pressure equalizing upper end branch pipes 51 are all communicated with the pressure equalizing upper end header pipe 5, and each pressure equalizing upper end branch pipe 51 is provided with a pressure equalizing upper end control valve 511 for equalizing pressure. The pressure equalizing upper header pipe 5 is communicated with the nitrogen header pipe 2. And a final-rise master control valve 52 is arranged at one end of the pressure-equalizing upper header pipe 5 close to the nitrogen header pipe 2.
An oxygen-rich branch pipe 31 and a pressure-equalizing lower-end branch pipe 41 are communicated between each intake pipe 11 and the corresponding adsorption tower 9 and air control valve 111. The oxygen-enriched branch pipes 31 are all communicated with the oxygen-enriched header pipe 3, and each oxygen-enriched branch pipe 31 is provided with an oxygen-enriched control valve 311 for controlling the oxygen-enriched gas to be discharged out of the adsorption tower 9. The pressure equalizing lower end branch pipes 41 are all communicated with the pressure equalizing lower end header pipe 4, and each pressure equalizing lower end branch pipe 41 is provided with a pressure equalizing lower end control valve 411. When the pressure-equalizing lower end control valves 411 and the pressure-equalizing upper end control valves 511 of the two adsorption towers 9 communicating with the same pressure-equalizing lower end header pipe 4 and the same pressure-equalizing upper end header pipe 5 are all opened, the air pressures in the two adsorption towers 9 are gradually adjusted to be the same through the pressure-equalizing lower end header pipe 4 and the pressure-equalizing upper end header pipe 5.
The nitrogen vacuum pump 6 and the nitrogen booster compressor 7 are connected in series with the nitrogen header pipe 2, so that nitrogen produced by the four adsorption towers 9 can be exhausted through the nitrogen vacuum pump 6 and the nitrogen booster compressor 7. The nitrogen header pipe 2 is further provided with a nitrogen buffer tank 22, so that nitrogen produced by the four adsorption towers 9 can be discharged through the nitrogen buffer tank 22 and then through the nitrogen vacuum pump 6 and the nitrogen booster 7.
The oxygen-enriched vacuum pump 8 is connected with the oxygen-enriched header pipe 3, so that the oxygen-enriched gas desorbed by the four adsorption towers 9 can be discharged through the oxygen-enriched vacuum pump 8. The oxygen enrichment header pipe 3 is also provided with an oxygen enrichment buffer tank 32, so that oxygen-enriched gas desorbed by the four adsorption towers 9 can pass through the oxygen enrichment buffer tank 32 and then is discharged through the oxygen enrichment vacuum pump 8.
The utility model discloses a high-purity nitrogen plant's of negative pressure four adsorption towers 9 are adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D respectively. In this embodiment, the whole nitrogen production process sequence and the situation where the two adsorption towers 9 are matched with each other will be described by taking the adsorption tower a and the adsorption tower B as examples. The process and the coordination of the adsorption column C and the adsorption column D are the same as those of the adsorption column a and the adsorption column B. The timing control diagram of the present invention is shown in table 1. In Table 1, A represents adsorption, ED represents pressure-equalizing drop, W represents waiting, VC represents evacuation, ER represents pressure-equalizing rise, and FR represents final pressure rise.
TABLE 1
Figure BDA0002204962650000061
Figure BDA0002204962650000071
Step 1 to step 4, adsorption by an adsorption tower A and desorption by an adsorption tower B: controlling raw material gas (air) to enter an adsorption tower A for adsorption from an air main pipe 1 and an air inlet pipe 11, and making nitrogen enter a nitrogen buffer tank 22 through an air outlet pipe 21 and a nitrogen main pipe 2; under the action of the nitrogen vacuum pump 6, the nitrogen in the nitrogen buffer tank 22 is sent to the nitrogen booster 7 to be compressed to a set pressure and then to a user. The adsorption tower 9A stops adsorption after adsorption saturation. And in the adsorption process of the adsorption tower A, the adsorption tower B desorbs. In the process, the oxygen-enriched vacuum pump 8 vacuumizes the adsorption tower B, so that the adsorption tower B is desorbed. Oxygen-enriched gas obtained by desorption of the adsorption tower B is pumped out from the bottom of the adsorption tower 9 and is pressurized to micro-positive pressure by the oxygen-enriched vacuum pump 8 and then is delivered to a user.
Step 5 and step 6, pressure equalization of the adsorption tower A and pressure equalization of the adsorption tower B: at this time, the pressure equalizing lower end control valve 411 and the pressure equalizing upper end control valve 511 of the adsorption column a and the pressure equalizing lower end control valve 411 and the pressure equalizing upper end control valve 511 of the adsorption column B are all opened. The adsorption tower A and the adsorption tower B are communicated through a pressure-equalizing lower end header pipe 4 and a pressure-equalizing upper end header pipe 5, so that the air pressure in the adsorption tower A is gradually reduced, the air pressure in the adsorption tower B is gradually increased, and finally the air pressures of the adsorption tower A and the adsorption tower B are basically the same.
And 7 and 8, the adsorption tower A waits, and the adsorption tower B is finally pressurized. In this process, the pressure equalizing upper end control valve 511 of the adsorption tower B and the final rise master control valve 52 of the pressure equalizing upper end header pipe 5 are both opened. Since the atmospheric pressure in the adsorption tower B is still low, the nitrogen gas produced by the other adsorption tower 9 is sucked into the adsorption tower B, so that the atmospheric pressure in the adsorption tower B continues to rise.
And 9 to 12 steps, vacuumizing the adsorption tower A, and adsorbing by the adsorption tower B. Since the adsorption tower a starts to be evacuated, the adsorbent in the adsorption tower a is gradually desorbed as the air pressure in the adsorption tower a is gradually decreased. The oxygen-enriched gas desorbed from the adsorption tower A is pumped out from the bottom of the adsorption tower 9, and is pressurized to micro-positive pressure by the oxygen-enriched vacuum pump 8 and then is delivered to the user. Meanwhile, in the process, raw material gas (air) is controlled to enter the adsorption tower B from the air main pipe 1 and the air inlet pipe 11 for adsorption, and the prepared nitrogen enters the nitrogen buffer tank 22 through the air outlet pipe 21 and the nitrogen main pipe 2; under the action of the nitrogen vacuum pump 6, the nitrogen in the nitrogen buffer tank 22 is sent to the nitrogen booster 7 to be compressed to a set pressure and then to a user. The adsorption tower A stops adsorption after saturated adsorption.
Step 13 and step 14, the pressure of the adsorption tower A is increased uniformly, and the pressure of the adsorption tower B is reduced uniformly. The pressure equalizing lower end control valve 411 and the pressure equalizing upper end control valve 511 of the adsorption column a and the pressure equalizing lower end control valve 411 and the pressure equalizing upper end control valve 511 of the adsorption column B are all opened. The adsorption tower A and the adsorption tower B are communicated through a pressure-equalizing lower end header pipe 4 and a pressure-equalizing upper end header pipe 5, so that the air pressure in the adsorption tower A is gradually increased, the air pressure in the adsorption tower B is gradually reduced, and finally the air pressures of the adsorption tower A and the adsorption tower B are basically the same.
In steps 15 and 16, the pressure of the adsorption tower A is increased finally, and the adsorption tower B waits. In this process, the pressure equalizing upper end control valve 511 of the adsorption column a and the final rise master control valve 52 of the pressure equalizing upper end header pipe 5 are both opened. Since the air pressure in the adsorption tower a is still low, the nitrogen gas produced by the other adsorption towers 9 is sucked into the adsorption tower a, so that the air pressure in the adsorption tower a continues to rise.
In the utility model, the pressure equalizing upper header pipe 5 is used for equalizing pressure in the process of equalizing pressure rise or equalizing pressure drop of the adsorption tower 9; in the final pressure rise process of the adsorption tower 9, a final pressure rise master control valve 52 of the pressure-equalizing upper-end main pipe 5 is opened, and the pressure-equalizing upper-end main pipe 5 is used for final pressure rise.
Silica gel or alumina or 3A molecular sieve desiccant is filled at the bottom of the adsorption tower 9 to adsorb moisture carbon dioxide, and the main adsorbent is a carbon molecular sieve. Because the diffusion rates of the two gases of oxygen and nitrogen on the surface of the carbon molecular sieve are different, a large amount of oxygen is adsorbed by the carbon molecular sieve when passing through the adsorbent bed, the adsorbed amount of nitrogen is relatively small, and the gradually concentrated nitrogen reaches the standard and then is converged to flow to the outlet of the adsorption tower 9.
After the air enters the adsorption tower 9, the oxygen and other gases are adsorbed by the nitrogen making adsorbent, and only the nitrogen passes through the adsorption tower 9. Since the oxygen in the air occupies 21%, the oxygen is adsorbed by the nitrogen making adsorbent, which causes a large negative pressure to be formed in the adsorption tower 9, so that the air is sucked into the adsorption tower 9 under the negative pressure. Meanwhile, the nitrogen vacuum pump 6 pumps the nitrogen to the nitrogen booster 7 to compress and discharge the nitrogen, so that negative pressure is formed in the adsorption tower 9. These all make the utility model discloses a pressure swing adsorption equipment of negative pressure adsorption nitrogen generation can absorb the air by oneself, and need not send into adsorption tower 9 with the air through auxiliary assembly such as air-blower, has simplified the structure, has reduced the energy consumption simultaneously.
The utility model discloses a when high-purity nitrogen plant of negative pressure adsorption adsorbs, be the negative pressure in the adsorption tower 9, this helps nitrogen adsorbent adsorption non-product gas for adsorption effect is better, and then makes the purity of the nitrogen gas that makes higher. One tower is always used for adsorption and the other tower is used for vacuumizing in the whole process, so that the stability of the system is improved.
In addition, the utility model discloses a negative pressure adsorbs can obtain and collect oxygen-enriched gas during high-purity nitrogen generator desorption for once can produce two kinds of products.
In this embodiment, the air inlet end of the air main 1 is provided with a filter screen 12. Can filter the particulate matter in the air, avoid it to get into adsorption tower 9.
In this embodiment, the oxygen enrichment control valve 311, the nitrogen control valve 211, the pressure equalizing lower end control valve 411, the pressure equalizing upper end control valve 511, the final lift master control valve 52, and the air control valve 111 are all controlled by a PLC or DCS system. The control of the device is more intelligent, and the production efficiency is greatly improved.
In this embodiment, the number of the pressure equalizing lower header pipes 4 is 1. Each adsorption tower 9 is communicated with the pressure equalizing lower header pipe 4. Opening the pressure equalizing lower end control valve 411 and the pressure equalizing upper end control valve 511 of any two adsorption towers 9 can enable the two adsorption towers 9 to be communicated, and the pressures of the two adsorption towers can be balanced through the pressure equalizing lower end header pipe 4 and the pressure equalizing upper end header pipe 5.
In this embodiment, a spare adsorption tower 9 is further included. The spare adsorption tower 9 is connected in parallel with the four adsorption towers 9. The parallel connection here means: the spare adsorption tower 9 is provided with an oxygen-enriched branch pipe 31, a pressure-equalizing lower end branch pipe 41, a pressure-equalizing upper end branch pipe 51 and an air outlet pipe 21 which are completely the same as the adsorption tower 9; the gas outlet pipe 21 is connected to the nitrogen gas header pipe 2 and is provided with a nitrogen gas control valve 211; the oxygen-enriched branch pipe 31 is connected with the oxygen-enriched header pipe 3 and is provided with an oxygen-enriched control valve 311; the pressure equalizing lower end branch pipe 41 is connected to the pressure equalizing lower end header pipe 4 and is provided with a pressure equalizing lower end control valve 411; the pressure equalizing upper end branch pipe 51 is connected to the pressure equalizing upper end header pipe 5 and is provided with a pressure equalizing upper end control valve 511. When any one adsorption tower 9 in the adsorption tower A, the adsorption tower B, the adsorption tower C and the adsorption tower D breaks down or needs to be replaced by the molecular sieve, any one adsorption tower 9 can be replaced by the standby adsorption tower 91, and the shutdown is avoided.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 (7)

1. The utility model provides a high-purity nitrogen generator of negative pressure adsorption which characterized by: comprises a nitrogen header pipe (2), a pressure-equalizing lower end header pipe (4), an oxygen-enriched header pipe (3), an air header pipe (1), a pressure-equalizing upper end header pipe (5), a nitrogen vacuum pump (6), a nitrogen booster (7), an oxygen-enriched vacuum pump (8) and four adsorption towers (9); an adsorbent is arranged in the adsorption tower (9);
the bottom end of each adsorption tower (9) is communicated with the air main pipe (1) through an air inlet pipe (11), and the top end of each adsorption tower (9) is communicated with the nitrogen main pipe (2) through an air outlet pipe (21); each air inlet pipe (11) is provided with an air control valve (111), and each air outlet pipe (21) is provided with a nitrogen control valve (211);
a pressure equalizing upper end branch pipe (51) is communicated between each gas outlet pipe (21) and the corresponding adsorption tower (9) and the nitrogen control valve (211); the pressure equalizing upper end branch pipes (51) are communicated with the pressure equalizing upper end header pipe (5), and each pressure equalizing upper end branch pipe (51) is provided with a pressure equalizing upper end control valve (511); the pressure equalizing upper end header pipe (5) is communicated with the nitrogen header pipe (2); a final-rise master control valve (52) is arranged at one end, close to the nitrogen main pipe (2), of the pressure-equalizing upper-end main pipe (5);
an oxygen-enriched branch pipe (31) and a pressure-equalizing lower end branch pipe (41) are communicated between each air inlet pipe (11) and the corresponding adsorption tower (9) and the corresponding air control valve (111); the oxygen-enriched branch pipes (31) are communicated with the oxygen-enriched header pipe (3), and each oxygen-enriched branch pipe (31) is provided with an oxygen-enriched control valve (311); the pressure equalizing lower end branch pipes (41) are communicated with the pressure equalizing lower end header pipe (4), and each pressure equalizing lower end branch pipe (41) is provided with a pressure equalizing lower end control valve (411);
the nitrogen vacuum pump (6) and the nitrogen booster compressor (7) are connected in series with the nitrogen header pipe (2), so that nitrogen produced by the four adsorption towers (9) can be exhausted through the nitrogen vacuum pump (6) and the nitrogen booster compressor (7);
the oxygen-enriched vacuum pump (8) is connected to the oxygen-enriched header pipe (3) so that oxygen-enriched gas desorbed by the four adsorption towers (9) can be discharged through the oxygen-enriched vacuum pump (8).
2. The negative pressure adsorption high-purity nitrogen production device according to claim 1, which is characterized in that: the nitrogen header pipe (2) is also provided with a nitrogen buffer tank (22) so that nitrogen produced by the four adsorption towers (9) can pass through the nitrogen buffer tank (22) and then is discharged through a nitrogen vacuum pump (6) and a nitrogen booster (7); the oxygen-enriched main pipe (3) is also provided with an oxygen-enriched buffer tank (32) so that the oxygen-enriched gas desorbed by the four adsorption towers (9) can be discharged through the oxygen-enriched buffer tank (32) and then through the oxygen-enriched vacuum pump (8).
3. The negative pressure adsorption high-purity nitrogen production device according to claim 1, which is characterized in that: and a filter screen (12) is arranged at the air inlet end of the air main pipe (1).
4. The negative pressure adsorption high-purity nitrogen production device according to claim 1, which is characterized in that: the bottom layer of the adsorption tower (9) is filled with alumina or silica gel or a 3A molecular sieve; the upper layer of the adsorption tower (9) is provided with a carbon molecular sieve.
5. The negative pressure adsorption high-purity nitrogen production device according to claim 1, which is characterized in that: the oxygen enrichment control valve (311), the nitrogen control valve (211), the pressure equalizing lower end control valve (411), the pressure equalizing upper end control valve (511), the final rise master control valve (52) and the air control valve (111) are controlled by a PLC or a DCS.
6. The negative pressure adsorption high-purity nitrogen production device according to claim 1, which is characterized in that: the number of the pressure equalizing lower header pipes (4) is 1; each adsorption tower (9) is communicated with the pressure-equalizing lower-end header pipe (4).
7. The negative pressure adsorption high-purity nitrogen production device according to claim 6, which is characterized in that: further comprises a standby adsorption tower (91); the standby adsorption tower (91) is connected with the four adsorption towers (9) in parallel.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114849424A (en) * 2022-05-23 2022-08-05 杭州普菲科空分设备有限公司 Large-scale VPSA nitrogen oxygen coproduction device of multitower antithetical couplet usefulness

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114849424A (en) * 2022-05-23 2022-08-05 杭州普菲科空分设备有限公司 Large-scale VPSA nitrogen oxygen coproduction device of multitower antithetical couplet usefulness

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