CN221815705U - PSA nitrogen making pressure swing adsorption separation system and PSA nitrogen making all-in-one - Google Patents

Abstract

The utility model provides a PSA nitrogen-making pressure swing adsorption separation system and a PSA nitrogen-making integrated machine, which relate to the technical field of nitrogen preparation and comprise a pressure swing adsorption separation module, the utility model is provided with a pressure equalizing gas storage tank, a first adsorption tower is used for adsorption, a first pressure equalizing valve is opened when a second adsorption tower is used for regeneration, a second pressure equalizing valve is closed, nitrogen generated by the first adsorption tower enters the pressure equalizing gas storage tank for pressure maintaining when the second adsorption tower is used for regeneration, when the equipment enters a pressure equalizing state, the first pressure equalizing valve is closed, the second pressure equalizing valve is opened, and gas in the pressure equalizing gas storage tank slowly enters the second adsorption tower, so that the pressure in the second adsorption tower slowly rises to be close to the pressure of the first adsorption tower, after the adsorption of the first adsorption tower is finished, the input high-pressure compressed gas is reduced when the adsorption of the first adsorption tower is switched to the second adsorption tower, and the impact on the molecular sieve in the second adsorption tower is reduced when the gas enters the second adsorption tower.

Description

A PSA nitrogen production pressure swing adsorption separation system and a PSA nitrogen production integrated machine

Technical Field

The utility model relates to the technical field of nitrogen preparation, in particular to a PSA nitrogen production pressure swing adsorption separation system and a PSA nitrogen production integrated machine.

Background Art

PSA nitrogen generator refers to equipment that uses pressure swing adsorption (PSA) technology to produce nitrogen. The core of PSA technology is the use of materials with selective adsorption properties - molecular sieves. These molecular sieves can adsorb oxygen, moisture and other impurities in the air under high pressure, while letting nitrogen pass through, and then release the adsorbed gas under low pressure to recover the adsorption capacity of the molecular sieve. The workflow of PSA nitrogen generator usually includes two main steps: 1. Under higher pressure, compressed air is introduced into the adsorption tower equipped with molecular sieves. Oxygen and other impurities will be adsorbed by the molecular sieve, while nitrogen passes through and is collected. 2. Reduce the pressure in the adsorption tower so that the molecular sieve releases the adsorbed oxygen and other impurities (usually by passing part of the produced nitrogen for flushing), thereby restoring the adsorption capacity of the molecular sieve.

PSA nitrogen generators are generally equipped with two or more adsorption towers. When one tower is in the adsorption stage, the other tower can be desorbed and regenerated, so that nitrogen can be continuously provided. This design enables the PSA nitrogen generator to operate continuously and meet users' demand for nitrogen.

In the prior art, when the adsorption stage of the adsorption tower is completed, the pressure in the adsorption tower needs to be reduced for regeneration. As the pressure decreases, non-target gas molecules such as oxygen, carbon dioxide, and water vapor adsorbed on the adsorbent will desorb from the surface of the adsorbent. After the adsorbent is regenerated, the pressure in the adsorption tower needs to be increased again to the working pressure required for producing nitrogen so that the adsorption tower can restart the adsorption process. When re-pressurizing, the current prior art generally uses compressed air to flush into the adsorption tower after the regeneration is completed. Since the internal pressure of the adsorption tower is relatively low at the beginning, when the high-pressure compressed gas enters the interior of the adsorption tower, it will impact the molecular sieve inside the tower, which can easily lead to the pulverization of the molecular sieve. In addition, in the prior art, the gas consumption for increasing the pressure from the regenerated state to the state capable of adsorption is relatively high, and the required pressure increase time is relatively long, which makes it difficult to meet the needs of high-efficiency PSA nitrogen generators.

Utility Model Content

The purpose of the utility model is to provide a PSA nitrogen production pressure swing adsorption separation system and a PSA nitrogen production integrated machine to solve the problems raised in the above background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions:

A PSA nitrogen production pressure swing adsorption separation system, comprising a pressure swing adsorption separation module, wherein the pressure swing adsorption separation module comprises:

A first adsorption valve and a second adsorption valve, wherein the first adsorption valve is connected to the bottom of the first adsorption tower and is used to connect to an external compressed air delivery pipeline and deliver it to the inside of the first adsorption tower, and the second adsorption valve is connected to the bottom of the second adsorption tower and is used to connect to external compressed air and deliver it to the inside of the second adsorption tower;

A first adsorption tower and a second adsorption tower, wherein the first adsorption tower and the second adsorption tower are used to alternately separate nitrogen from the compressed air, the top of the first adsorption tower is sequentially connected to a first three-way pressure equalizing valve and a first gas outlet valve, and the top of the second adsorption tower is sequentially connected to a second three-way pressure equalizing valve and a second gas outlet valve;

A pressure-equalizing gas storage tank, which is connected to a four-way ball valve, and the four-way ball valve is also connected to the first pressure-equalizing valve and the second pressure-equalizing valve, and is used to store the nitrogen separated by the first adsorption tower and the second adsorption tower;

The first gas outlet valve, the second gas outlet valve and the nitrogen output pipeline are connected to discharge the separated nitrogen, and the connections are all pipeline connections.

Furthermore, the pressure swing adsorption separation module also includes a first regeneration valve and a second regeneration valve, one end of the first regeneration valve is connected to the muffler, and the other end is connected to the pipeline between the first adsorption valve and the first adsorption tower, and one end of the second regeneration valve is connected to the muffler, and the other end is connected to the pipeline between the second adsorption valve and the second adsorption tower.

Furthermore, the PSA nitrogen production pressure swing adsorption separation system includes at least two groups of staged start-up pressure swing adsorption separation modules, multiple groups of compressed air delivery pipelines outside the pressure swing adsorption separation modules are connected in parallel, and multiple groups of nitrogen output pipelines outside the pressure swing adsorption separation modules are connected in parallel.

Furthermore, adjacent pressure swing adsorption separation modules share a group of equalizing pressure gas storage tanks.

Furthermore, the first adsorption tower, the second adsorption tower and the pressure equalizing gas storage tank are all provided with pressure gauges.

The present invention further provides a PSA nitrogen generator, which comprises a compressed air source module, a gas storage module, a fixed bracket and a pressure swing adsorption separation module as described in any one of claims 1 to 4, wherein the pressure swing adsorption separation module, the compressed air source module and the gas storage module are all installed on the fixed bracket, the compressed air source module is used to provide compressed air for the pressure swing adsorption separation module, and the gas storage module is used to store the separated nitrogen discharged from the first gas outlet valve and the second gas outlet valve.

Furthermore, a gas processing module is also included. The gas processing module is arranged between the compressed air source module and the pressure swing adsorption separation module, and is used for purifying the compressed air generated by the compressed air source module.

Furthermore, the fixed bracket includes a base and a protective cover, and the gas storage module, gas processing module, pressure swing adsorption separation module and compressed air source module are fixed on the base in sequence, and the gas processing module, pressure swing adsorption separation module and compressed air source module are fixed with a mesh protective cover on the outside.

Furthermore, a partition is provided between the body treatment module and the pressure swing adsorption separation module.

Compared with the prior art, the beneficial effects of the utility model are:

When the second adsorption tower is adsorbed and the first adsorption tower is regenerated, the second pressure-equalizing valve is opened and the second pressure-equalizing valve is closed. At this time, the nitrogen generated by the first adsorption tower enters the pressure-equalizing gas tank to maintain pressure. When the regeneration of the second adsorption tower is completed and the equipment enters the pressure-equalizing state, the first pressure-equalizing valve is closed and the second pressure-equalizing valve is opened. At this time, the gas in the pressure-equalizing gas tank slowly enters the second adsorption tower, so that the pressure inside the second adsorption tower is slowly increased to a pressure close to that of the first adsorption tower. After the adsorption of the first adsorption tower is completed, when switching to the second adsorption tower for adsorption, since there is gas with high nitrogen purity close to the working pressure inside the second adsorption tower, the second adsorption tower can not only stabilize the pressure and purity, but also reduce the impact of the input high-pressure compressed gas on the internal molecular sieve when entering the second adsorption tower, when the second adsorption tower is adsorbed and the first adsorption tower is regenerated, the second pressure-equalizing valve is opened and the first pressure-equalizing valve is closed, and the pressure-equalizing gas tank alternately stores and releases nitrogen.

The utility model can allow the regenerated adsorption tower to store high-purity nitrogen in advance, and can save gas and increase the pressure in the adsorption tower at the same time. The gas consumption required from regeneration to pressure increase to the adsorption state is small, and the regenerated adsorption tower can quickly reach the pressure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a pressure swing adsorption separation module system of the utility model;

FIG2 is a schematic diagram of the system structure of two pressure swing adsorption separation modules in parallel in the utility model;

FIG3 is a schematic diagram of the system structure of the PSA nitrogen generator in the utility model;

FIG4 is a schematic diagram of the structure of the PSA nitrogen generator in the utility model;

FIG5 is a schematic diagram of the structural axial side of the PSA nitrogen generator in the utility model.

In the figure: a pressure swing adsorption separation module 100, a first adsorption valve 101, a second adsorption valve 102, a first adsorption tower 103, a second adsorption tower 104, a first regeneration valve 105, a second regeneration valve 106, a muffler 107, a first equalizing pressure valve 108, a first gas outlet valve 109, a second equalizing pressure valve 110, a second gas outlet valve 111, a four-way ball valve 112, a pressure equalizing gas storage tank 113, a gas storage module 300, a fixed bracket 400, a base 410, a protective cover 420, and a gas processing module 500.

DETAILED DESCRIPTION

In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Example:

Please refer to Figures 1 to 2, the utility model provides a technical solution:

A PSA nitrogen production pressure swing adsorption separation system includes a pressure swing adsorption separation module 100, wherein the pressure swing adsorption separation module 100 includes a first adsorption valve 101, a second adsorption valve 102, a first adsorption tower 103, a second adsorption tower 104 and a pressure equalizing gas storage tank 113, wherein:

The first adsorption valve 101 and the second adsorption valve 102 are connected in parallel on the compressed air intake pipeline. The first adsorption valve 101 and the second adsorption valve 102 are both electromagnetic pneumatic valves. The first adsorption valve 101 is connected to the bottom of the first adsorption tower 103 for connecting to an external compressed air delivery pipeline and delivering it to the first adsorption tower 103. The second adsorption valve 102 is connected to the bottom of the second adsorption tower 104 for connecting to external compressed air and delivering it to the second adsorption tower 104. The compressed air intake pipeline is used to deliver compressed air. The first adsorption valve 101 and the second adsorption valve 102 respectively control the on-off of compressed air entering the first adsorption tower 103 and the second adsorption tower 104.

The first adsorption tower 103 and the second adsorption tower 104 are used to alternately separate nitrogen from the compressed air. The top of the first adsorption tower 103 is sequentially connected to a first three-way pressure equalizing valve 108 and a first air outlet valve 109, and the top of the second adsorption tower 104 is sequentially connected to a second three-way pressure equalizing valve 110 and a second air outlet valve 111.

The first adsorption tower 103 and the second adsorption tower 104 are filled with molecular sieves. Nitrogen and oxygen are separated due to their different adsorption capacities on the surface of the molecular sieves. When compressed air enters the adsorption towers, impurities such as oxygen, carbon dioxide, and water vapor will be preferentially adsorbed by the molecular sieves, while nitrogen passes through the adsorption towers with less adsorption due to its larger molecular size and lower adsorption affinity.

Furthermore, the first adsorption tower 103, the second adsorption tower 104 and the pressure equalizing gas storage tank 113 are all provided with pressure gauges, which can monitor and understand the pressure in the first adsorption tower 103, the second adsorption tower 104 and the pressure equalizing gas storage tank 113, and facilitate the judgment whether there is abnormal pressure change.

The pressure-equalizing gas storage tank 113 is connected to the four-way ball valve 112, and the four-way ball valve 112 is also connected to the first pressure-equalizing valve 108 and the second pressure-equalizing valve 110, and is used to store the nitrogen separated by the first adsorption tower 103 and the second adsorption tower 104. The pressure-equalizing gas storage tank has a certain capacity.

In this embodiment, when the first adsorption tower 103 is adsorbing and the second adsorption tower 104 is regenerating, the first adsorption valve 101 is opened and the second adsorption valve 102 is closed. At this time, the compressed high-pressure gas enters the interior of the first adsorption tower 103 through the first adsorption valve 101, the first equalizing pressure valve 108 and the first gas outlet valve 109 are opened, and the second equalizing pressure valve 110 and the second gas outlet valve 111 are closed. The produced nitrogen is divided into two paths, one path is discharged, and the other path enters the equalizing pressure gas storage tank 113 for pressure maintenance.

When the molecular sieve of the first adsorption tower 103 is about to reach adsorption saturation and the regeneration of the second adsorption tower 104 is completed, the first adsorption valve 101 is closed, the first adsorption tower 103 stops adsorption, the first pressure equalizing valve 108 and the first gas outlet valve 109 are closed, and the second pressure equalizing valve 110 is opened. At this time, the gas in the pressure equalizing gas tank 113 slowly enters the second adsorption tower 104, so that the pressure inside the second adsorption tower 104 slowly increases to a pressure close to that of the first adsorption tower 103. When the adsorption of the first adsorption tower 103 is switched to the adsorption of the second adsorption tower 104, since there is originally high-purity gas close to the equipment pressure inside the second adsorption tower 104, the equipment can not only stabilize the pressure and purity, but also reduce the impact of high-pressure gas on the molecular sieve.

The first gas outlet valve 109, the second gas outlet valve 111 and the nitrogen output pipeline are connected to discharge the separated nitrogen, and the connections are all pipeline connections.

Furthermore, the pressure swing adsorption separation module also includes a first regeneration valve 105 and a second regeneration valve 106, wherein one end of the first regeneration valve 105 is connected to the muffler 107, and the other end is connected to the pipeline between the first adsorption valve 101 and the first adsorption tower 103, and one end of the second regeneration valve 106 is connected to the muffler 107, and the other end is connected to the pipeline between the second adsorption valve 102 and the second adsorption tower 104.

When the first regeneration valve 105 and the second regeneration valve 106 are opened, they can respectively reduce the pressure inside the first adsorption tower 103 and the second adsorption tower 104, so that the molecular sieve releases the adsorbed oxygen and other impurities and completes the regeneration. When the adsorbed gas is released from the high-pressure environment to the atmospheric pressure environment, the gas flow will generate noise. Due to safety regulations, environmental standards and the comfort of the working environment, this noise needs to be controlled. The muffler 107 is a device used to reduce this noise. It is connected to the first regeneration valve 105 and the second regeneration valve 106 to absorb or disperse the noise generated by the gas flow to prevent high-decibel sound from being directly discharged into the environment.

In this embodiment, the PSA nitrogen production pressure swing adsorption separation system includes at least two groups of staged start-up pressure swing adsorption separation modules 100, multiple groups of compressed air delivery pipelines outside the pressure swing adsorption separation modules 100 are connected in parallel, and multiple groups of nitrogen output pipelines outside the pressure swing adsorption separation modules 100 are connected in parallel.

By combining multiple groups of pressure swing adsorption separation modules 100, multiple groups of pressure swing adsorption separation modules 100 are switched alternately for operation. Taking two groups of pressure swing adsorption separation modules 100 as an example, they are marked as machine No. 1 and machine No. 2 respectively. Machine No. 1 and machine No. 2 are connected in parallel, started in stages, and switched alternately. Machine No. 1 is started first, and after a delay of 20-30 seconds after starting, machine No. 2 is started. The effect of this is that the gas volume inside a single group of modules is less. When the equipment is inverted and exhausted, the gas to be released will also be less, reducing the load on the air compressor. The design of multiple modular groups can also make the gas diffuse more evenly when entering the cavity of the adsorption cylinder, reducing the impact of the gas itself on the molecular sieve.

Furthermore, adjacent pressure swing adsorption separation modules share a group of equalizing gas storage tanks 113, so that the equalizing gas storage tanks 113 are alternately inflated and deflated for different adsorption towers.

The utility model further provides a PSA nitrogen generator, which includes a compressed air source module 200, a gas storage module 300, a fixed bracket 400 and the above-mentioned pressure swing adsorption separation module 100. The pressure swing adsorption separation module 100, the compressed air source module 200 and the gas storage module 300 are all installed on the fixed bracket 400. The compressed air source module 200 is used to provide compressed air for the pressure swing adsorption separation module 100, and the gas storage module 300 is used to store the separated nitrogen discharged from the first outlet valve 109 and the second outlet valve 111.

Furthermore, the PSA nitrogen generator also includes a gas processing module 500 , which is disposed between the compressed air source module 200 and the pressure swing adsorption separation module 100 and is used to purify the compressed air generated by the compressed air source module 200 .

In this embodiment, the compressed air source module 200 is based on an oil-free or screw air compressor, and the compressed air processing module 500 includes an air filter element. The air passes through the air filter element and then reaches the air compressor after passing through the air intake tee. The air compressor is driven by a motor to pressurize the air. The pressurized high-pressure air enters the oil and gas barrel for oil and gas separation. At this time, the gas enters the air storage tank after being cooled by the radiator. The radiator is cooled by a fan. At the same time, the lubricating oil inside the air compressor is also cooled by the radiator. The cooled lubricating oil returns to the machine head through the oil filter to achieve oil circulation.

The high-pressure air in the air storage tank passes through the first filter and reaches the cold dryer for air-water separation. The separated air passes through the second filter and is divided into two paths. One path enters the modular pressure swing adsorption separation module, and the other path passes through the adjustable first electric valve. The first electric valve is divided into two conversion paths. One path is directly discharged, which is the low-quality air mode, and the other path enters the dryer for further water removal to obtain a high-quality air mode.

The gas storage module 300 includes a first one-way valve. The nitrogen obtained by the pressure adsorption separation module 100 is divided into two paths, one path passes through the first one-way valve to enter the adsorption dryer, and the other path passes through the second one-way valve to enter the return gas storage tank. Manual regulating valves are set at the front and rear ends of the return gas storage tank to adjust the gas volume. The return gas storage tank is used for PSA regeneration and pressure equalization.

After the nitrogen passes through the dehydrator for gas-water separation, it enters the nitrogen storage tank through the third one-way valve. The third filter is set at the outlet of the nitrogen storage tank. After passing through the filter, the nitrogen is controlled by the adjustable second electric valve. The flow meter, nitrogen analyzer and pressure sensor are set at the rear end of the regulating valve. The quality and flow of nitrogen at the user end are monitored and adjusted by the above instruments to ensure the efficient arrangement of gas-using equipment.

Furthermore, the fixing bracket 400 includes a base 410 and a protective cover 420, on which the gas storage module 300, the gas processing module 500, the pressure swing adsorption separation module 100 and the compressed air source module 200 are fixed in sequence, and the gas processing module 500, the pressure swing adsorption separation module 100 and the compressed air source module 200 are externally fixed with a mesh protective cover 420.

In this embodiment, a partition 210 is provided between the body treatment module 500 and the pressure swing adsorption separation module 100 to avoid mutual influence between the two.

The use principle of this utility model:

When adsorption is carried out in the first adsorption tower 103 and the second adsorption tower 104 is regenerated, the first adsorption valve 101 is opened and the second adsorption valve 102 is closed, and the compressed high-pressure gas enters the interior of the first adsorption tower 103 through the first adsorption valve 101, the first equalizing pressure valve 108 and the first gas outlet valve 109 are opened, and the second equalizing pressure valve 110 and the second gas outlet valve 111 are closed, and the produced nitrogen is divided into two paths, one path is discharged, and the other path enters the equalizing pressure gas storage tank 113 for pressure maintenance.

When the molecular sieve of the first adsorption tower 103 is about to reach adsorption saturation and the regeneration of the second adsorption tower 104 is completed, the first adsorption valve 101 is closed, the first adsorption tower 103 stops adsorption, the first pressure equalizing valve 108 and the first gas outlet valve 109 are closed, the second pressure equalizing valve 110 is opened, and the gas in the pressure equalizing gas tank 113 slowly enters the second adsorption tower 104, so that the pressure inside the second adsorption tower 104 slowly increases to a pressure close to that of the first adsorption tower 103. When the adsorption of the first adsorption tower 103 is switched to that of the second adsorption tower 104, since there is originally high-purity gas close to the equipment pressure inside the second adsorption tower 104, the equipment can stabilize both the pressure and the purity.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims (9)

1. A PSA nitrogen production pressure swing adsorption separation system, comprising a pressure swing adsorption separation module (100), characterized in that the pressure swing adsorption separation module (100) comprises: a first adsorption valve (101) and a second adsorption valve (102), wherein the first adsorption valve (101) is connected to the bottom of the first adsorption tower (103) and is used to connect to an external compressed air delivery pipeline and deliver the compressed air to the inside of the first adsorption tower (103); and the second adsorption valve (102) is connected to the bottom of the second adsorption tower (104) and is used to connect to the external compressed air and deliver the compressed air to the inside of the second adsorption tower (104); A first adsorption tower (103) and a second adsorption tower (104), wherein the first adsorption tower (103) and the second adsorption tower (104) are used to alternately separate nitrogen from the compressed air, wherein the top of the first adsorption tower (103) is sequentially connected to a first three-way pressure equalizing valve (108) and a first gas outlet valve (109), and the top of the second adsorption tower (104) is sequentially connected to a second three-way pressure equalizing valve (110) and a second gas outlet valve (111); A pressure equalizing gas storage tank (113), the pressure equalizing gas storage tank (113) being connected to a four-way ball valve (112), the four-way ball valve (112) being further connected to a first pressure equalizing valve (108) and a second pressure equalizing valve (110), and being used to store nitrogen separated by the first adsorption tower (103) and the second adsorption tower (104); The first gas outlet valve (109), the second gas outlet valve (111) and the nitrogen output pipeline are connected to discharge the separated nitrogen, and the connections are all pipeline connections. 2. A PSA nitrogen production pressure swing adsorption separation system according to claim 1, characterized in that: the pressure swing adsorption separation module also includes a first regeneration valve (105) and a second regeneration valve (106), one end of the first regeneration valve (105) is connected to the muffler (107), and the other end is connected to the pipeline between the first adsorption valve (101) and the first adsorption tower (103), and one end of the second regeneration valve (106) is connected to the muffler (107), and the other end is connected to the pipeline between the second adsorption valve (102) and the second adsorption tower (104). 3. A PSA nitrogen production pressure swing adsorption separation system according to claim 1, characterized in that: the PSA nitrogen production pressure swing adsorption separation system comprises at least two groups of staged start-up pressure swing adsorption separation modules (100), the compressed air delivery pipelines outside the multiple groups of pressure swing adsorption separation modules (100) are connected in parallel, and the nitrogen output pipelines outside the multiple groups of pressure swing adsorption separation modules (100) are connected in parallel. 4. A PSA nitrogen production pressure swing adsorption separation system according to claim 3, characterized in that: a group of equalizing pressure gas storage tanks (113) are shared between adjacent pressure swing adsorption separation modules. 5. A PSA nitrogen production pressure swing adsorption separation system according to claim 1, characterized in that: the first adsorption tower (103), the second adsorption tower (104) and the equalizing pressure gas storage tank (113) are all provided with pressure gauges. 6. A PSA nitrogen generator, characterized in that: the PSA nitrogen generator comprises a compressed air source module (200), a gas storage module (300), a fixed bracket (400) and a pressure swing adsorption separation module (100) according to any one of claims 1 to 5, the pressure swing adsorption separation module (100), the compressed air source module (200) and the gas storage module (300) are all installed on the fixed bracket (400), the compressed air source module (200) is used to provide compressed air for the pressure swing adsorption separation module (100), and the gas storage module (300) is used to store the separated nitrogen discharged from the first outlet valve (109) and the second outlet valve (111). 7. A PSA nitrogen generator according to claim 6, characterized in that it also includes a gas processing module (500), wherein the gas processing module (500) is arranged between the compressed air source module (200) and the pressure swing adsorption separation module (100), and is used for purifying the compressed air generated by the compressed air source module (200). 8. A PSA nitrogen generator according to claim 7, characterized in that: the fixed bracket (400) comprises a base (410) and a protective cover (420), and the base (410) is fixed with a gas storage module (300), a gas processing module (500), a pressure swing adsorption separation module (100) and a compressed air source module (200) in sequence, and the gas processing module (500), the pressure swing adsorption separation module (100) and the compressed air source module (200) are fixed with a mesh protective cover (420) on the outside. 9. The PSA nitrogen generator according to claim 8, characterized in that a partition (210) is provided between the gas treatment module (500) and the pressure swing adsorption separation module (100).