Pressure stabilizing system for PSA (pressure swing adsorption) nitrogen production process

Abstract

The utility model relates to the technical field of nitrogen making systems, and discloses a PSA nitrogen making process pressure stabilizing system which comprises a PSA nitrogen making system and a pressure stabilizing gas storage module, the PSA nitrogen making system comprises a PSA nitrogen making machine and a nitrogen storage assembly, and the pressure stabilizing gas storage module comprises a nitrogen pressure stabilizing gas storage assembly, an exhaust pressure adjusting assembly and a pressurizing assembly. The nitrogen pressure stabilizing and storing assembly and the PSA nitrogen making machine are arranged in parallel, and when the tail end nitrogen demand is larger than the rated gas production capacity of the PSA nitrogen making system, after pressure adjustment is conducted on nitrogen in the nitrogen pressure stabilizing and storing assembly through the exhaust pressure adjusting assembly, the nitrogen is supplied to the nitrogen demand end together with the nitrogen storing assembly; according to the scheme, the problem that the short-time transient flow exceeds the standard can be solved, a good adjusting effect can be achieved on the conditions that the requirement for the fluctuation moment is large and the duration time is long, and under the condition that local loss and expansion loss are fully considered, the pressure of a nitrogen system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen production systems, in particular to a PSA nitrogen production process pressure stabilizing system. Background Art

[0002] PSA pressure swing adsorption air separation nitrogen generator uses compressed air as raw material, adopts new adsorbent carbon molecular sieve, and uses pressure swing adsorption principle at room temperature to separate oxygen and nitrogen in the air, thereby obtaining nitrogen with purity of 95%-99.995%. Compared with the traditional nitrogen production method, this method has the characteristics of simple process flow, high degree of automation, fast gas production (15-30 minutes), low energy consumption, product purity can be adjusted within a large range according to user needs, easy operation and maintenance, low operating cost, strong device adaptability, etc., so in 1000Nm 3 / h or less nitrogen production equipment, and is increasingly welcomed by medium and small nitrogen users. PSA nitrogen production has become the preferred method for medium and small nitrogen users;

[0003] The basic process topology of traditional PSA nitrogen production is as follows: Figure 2 As shown, after the air passes through the inlet filter 101 and is compressed by the compressor 102, it flows into the compressed air supporting post-processing system 103. The processed compressed air flows into the compressed air storage tank 104, and is then divided into two parts: the part for supplying other compressed air users and the part for serving as the raw gas for PSA nitrogen production. The compressed air as the raw gas enters the PSA process nitrogen generator 105, and operates according to the set double-tank pressure swing adsorption system. After the finished nitrogen flows into the nitrogen storage tank 106, the nitrogen of the corresponding purity is supplied to the end user.

[0004] At present, PSA technology is widely used in heat treatment protective atmosphere of metal materials and mechanical parts; nitrogen filling for anti-oxidation in the production process of synthetic fiber, petrochemical industry, float glass, etc.; food preservation; grain storage, Chinese medicine preservation, tea color preservation; chemical, oil tanker and liquefied gas tanker, etc., conditioning, replacement, pipeline purging, etc.

[0005] However, one thing is clear: for the site, since the gas flow unit considered in the current selection of PSA nitrogen generator is Nm 3 / h, the time unit corresponding to this selection method is h, which is a time unit that is difficult to match with instantaneous working conditions. From this perspective, the operation of the PSA system itself requires a relatively stable working environment, including stable upstream compressed air flow and pressure, and stable downstream nitrogen use conditions. Above the minimum pressure requirement, the PSA inlet and outlet pressure difference must also remain stable.

[0006] However, as the source of protective gas and purging, the working environment that most small and medium-sized users need to face is unstable. In addition, since the PSA nitrogen production system is often a subsystem embedded in the main compressed air, considering the continuity of fluid flow, the raw gas stability of the PSA nitrogen production process is inevitably affected by the use process of other compressed air users on the corresponding pipeline network.

[0007] Different types of instability can be considered for the operating status of different downstream processes. The first type is that the terminal gas volume fluctuates to a certain extent, but the instantaneous nitrogen demand is within the range of the selected PSA single-machine adjustment capacity; the second type of terminal nitrogen instability is that the statistical time proportion of the fluctuating instantaneous demand exceeding the single-machine adjustment capacity is relatively small; the third type is that the fluctuating instantaneous demand is large and lasts for a long time.

[0008] The traditional PSA nitrogen production process has relatively limited overall adjustment capabilities and means for the instability caused by the above-mentioned fluctuations at the end and compressed air side. It mainly relies on the adjustment capabilities of the PSA nitrogen generator itself, but this capability is often not enough to deal with the above-mentioned instability problems, especially the second and third instabilities. For these two instabilities, there are roughly three ways to deal with them in the industry:

[0009] One is to use multiple PSA devices in parallel to deal with this deficiency. The biggest problem with this method is that the process of nitrogen production by each PSA device is originally a process of selective adsorption by adsorbent, which is achieved according to a specified procedure. The air-nitrogen ratio of nitrogen produced by each PSA device is approximately 4.6:1. If multiple PSA devices are selected to cope with the situation where a single machine cannot match, in the corresponding program, in order to meet short-term needs, this method of selecting multiple devices will only waste more air, and the operating energy consumption will inevitably remain high; at the same time, the system investment will inevitably increase significantly.

[0010] The second method, in order to deal with these two instabilities, is to use pressurized liquid nitrogen vaporization to supplement the gas on site. On the one hand, the vaporization of liquid nitrogen takes time, and it is often difficult to stably respond to changing user needs. On the other hand, the cost is high.

[0011] The third method is to cooperate with the on-site cryogenic nitrogen production system, and introduce nitrogen from cryogenic nitrogen production through valve adjustment to ensure terminal use. But in fact, small and medium-sized users often do not have a cryogenic nitrogen supply system as a parallel gas source. So overall, from an industry perspective, there is a lack of effective pressure stabilization methods and supporting processes.

[0012] Aiming at the above-mentioned problems existing in nitrogen fluctuation stability control when small and medium-sized enterprises select the PSA nitrogen production process on site, the utility model proposes an intelligent and efficient pressure stabilization process with high versatility. Utility Model Content

[0013] The utility model aims to provide a PSA nitrogen production process pressure stabilizing system for solving the instability problem of the traditional PSA nitrogen production process.

[0014] The utility model is realized through the following technical solutions.

[0015] The utility model discloses a PSA nitrogen making process pressure stabilizing system, comprising a PSA nitrogen making system and a pressure stabilizing gas storage module, wherein the PSA nitrogen making system comprises a PSA nitrogen making machine and a nitrogen gas storage component (generally a nitrogen gas storage tank), wherein the pressure stabilizing gas storage module comprises a nitrogen pressure stabilizing gas storage component (generally a nitrogen pressure stabilizing gas storage tank), an exhaust pressure regulating component and a boosting component, wherein the nitrogen pressure stabilizing gas storage component and the nitrogen gas storage component are arranged in parallel with the PSA nitrogen making machine, wherein the boosting component is used to pressurize the nitrogen output by the PSA nitrogen making machine, and the pressurized nitrogen is stored in the nitrogen pressure stabilizing gas storage component, and when the terminal nitrogen demand is greater than the rated gas production capacity of the PSA nitrogen making system, the nitrogen in the nitrogen pressure stabilizing gas storage component is pressure regulated by the exhaust pressure regulating component, and then the nitrogen demand end is supplied with gas together with the nitrogen gas storage component.

[0016] According to an embodiment of the present utility model, the PSA nitrogen making system further includes a compressor, a compressed air post-processing device and a compressed air storage tank which are connected in sequence, and the compressed air storage tank is connected to the PSA nitrogen making machine.

[0017] According to an embodiment of the utility model, a raw gas inlet pressure-stabilizing regulating valve group is provided between the compressed air storage tank and the PSA nitrogen generator, and the function of the raw gas inlet pressure-stabilizing regulating valve group is to ensure the stability of the nitrogen raw gas inlet pressure.

[0018] According to an embodiment of the utility model, a first regulating valve is provided at the outlet end of the nitrogen gas storage assembly, and the pressure difference between the raw gas inlet pressure-stabilizing regulating valve group and the first regulating valve is adjusted to ensure that the PSA purity meets the requirements.

[0019] According to an embodiment of the utility model, the exhaust pressure regulating assembly includes a first switch valve, a pressure reducing valve and a second regulating valve, and the pressure reducing valve can be a self-operated pressure reducing valve.

[0020] According to an embodiment of the utility model, the nitrogen pressure-stabilizing gas storage assembly is also connected to the nitrogen demand end through a bypass valve.

[0021] According to an embodiment of the utility model, a temperature regulating module is provided at the pressure reducing valve. The temperature regulating module adopts a heater. The operation of the heater is aimed at the problem of expansion and refrigeration of high-pressure nitrogen. The heater is controlled with the goal of maintaining the nitrogen outlet temperature. The heater can usually be installed at the inlet end of the self-operated pressure reducing valve.

[0022] According to an embodiment of the utility model, considering that the normal pressure of the nitrogen pressure-stabilizing gas storage tank is higher than the pressure of the original nitrogen gas storage tank, a first check valve is provided between the nitrogen gas storage assembly and the nitrogen pressure-stabilizing gas storage assembly.

[0023] According to one embodiment of the utility model, the boosting assembly includes an oil-free booster, which is connected to a second switch valve, a third regulating valve and a second check valve, the pneumatic switch valve is connected to the inlet end of the oil-free booster, and the third regulating valve and the second check valve are sequentially arranged between the oil-free booster and the nitrogen pressure stabilizing gas storage assembly.

[0024] According to an embodiment of the utility model, the booster assembly is provided in two groups, with one in use and one as a backup, and the pipeline valves are adjusted accordingly.

[0025] The PSA nitrogen production process pressure stabilization method using the PSA nitrogen production process pressure stabilization system comprises the following steps:

[0026] The nitrogen external supply module of the PSA nitrogen production system is connected in parallel with the pressure-stabilizing gas storage module. The volume of the gas storage tank in the pressure-stabilizing gas storage module is determined as follows: V 储 =α×t 时长 ×Q 氮 / (P 储 -P 氮 ), α is the selection correction coefficient, considering local loss and expansion loss, α ranges from 1.2 to 1.5, t 时长 Design buffer time for the system, Q 氮 is the instantaneous flow demand value, P 储 is the design pressure value of the gas tank, P 氮 Q is the nitrogen pressure value when the PSA nitrogen production system is running, that is, the gas tank pressure in the PSA nitrogen production system. 氮 The unit is Nm 3 / min,V 储 The unit is m 3 ;

[0027] The pressure-stabilizing gas storage module stores at least part of the nitrogen generated in the PSA nitrogen generation system under pressure and maintains it within a set pressure range;

[0028] When the instantaneous demand for nitrogen at the terminal is greater than the rated gas production capacity of the PSA nitrogen production system, the pressure-stabilizing gas storage module enters the gas supply mode, and the pressure-stabilizing gas storage module is used to supplement the supply of nitrogen to the terminal nitrogen demand end to ensure that the instantaneous demand for nitrogen at the terminal is met. After the volume of the gas tank in the pressure-stabilizing gas storage module is adjusted, it can not only achieve regulation of the second unstable situation, but also achieve a better pressure stabilization effect for the third instability.

[0029] When the terminal nitrogen consumption is relatively stable and the fluctuation is within the adjustable range of a single machine, the pressure-stabilizing gas storage module can intervene or not intervene in the stable control.

[0030] Furthermore, the t 时长 ≥30min.

[0031] Furthermore, after the pressure-stabilizing gas storage module enters the gas supply mode, the temperature regulating module is used to regulate the nitrogen outlet temperature to ensure that the nitrogen outlet temperature is within a set range.

[0032] Furthermore, when the pressure-stabilizing gas storage module enters the gas supply mode, the channel through which the PSA nitrogen production system supplies gas to the pressure-stabilizing gas storage module is closed.

[0033] Beneficial effects of the utility model:

[0034] In the traditional PSA nitrogen production process, a pressure-stabilizing gas storage module is added in parallel. When the instantaneous demand for nitrogen at the terminal is greater than the rated gas production capacity, the nitrogen pressure-stabilizing gas storage tank can intervene quickly to ensure that the nitrogen supply pressure is stable within the corresponding period. By setting the raw gas inlet pressure-stabilizing regulating valve group and the first regulating valve, the nitrogen raw gas inlet pressure can be as stable as possible when other compressed air consumption fluctuates. Considering the fluctuation of the terminal pressure, within a certain range, the pressure difference between the outlet pressure of the raw gas inlet pressure-stabilizing regulating valve group and the inlet pressure of the first regulating valve is stable, thereby ensuring that the PSA purity meets the requirements. From the perspective of control, the raw gas inlet controls its outlet pressure to be stable, and the first regulating valve is used to control the pressure difference to be stable. In addition, the volume of the nitrogen pressure-stabilizing gas storage tank in the pressure-stabilizing gas storage module is determined by the method in this scheme. This scheme can not only deal with the problem of excessive short-term transient flow, but also has a better regulating effect on the situation where the fluctuation instantaneous demand is large and the duration is long, and the nitrogen system pressure is ensured under the condition of fully considering local losses and expansion losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 these drawings without paying creative work.

[0036] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0037] Figure 1 It is a topological structure diagram of the pressure stabilizing system of the PSA nitrogen production process of the utility model;

[0038] Figure 2This is the basic process topology diagram of traditional PSA nitrogen production;

[0039] 1 compressor inlet filter; 2 compressor; 3 compressed air post-processing equipment; 4 compressed air storage tank; 5 PSA nitrogen generator; 6 nitrogen storage tank; 7 second switch valve; 8 oil-free booster; 9 third regulating valve; 10 check valve; 11 first switch valve; 12 pressure reducing valve; 13 second regulating valve; 14 bypass valve; 15 check valve; 16 raw gas inlet pressure stabilizing regulating valve group; 17 nitrogen pressure stabilizing storage tank; 18 first regulating valve. DETAILED DESCRIPTION

[0040] Combine the following Figure 1 The utility model is described in detail.

[0041] System components: Figure 1 As shown, it includes a PSA nitrogen making system and a pressure-stabilizing gas storage module. In this embodiment, the traditional PSA nitrogen making system is used as the basis, but the application of the pressure-stabilizing gas storage module is not limited to this PSA nitrogen making system, and can also be used in a PSA nitrogen making system similar to the PSA nitrogen making system in this scheme. The PSA nitrogen making system process is as follows: the air flows into the air compressor 2 after being filtered by the compressor inlet filter 1, and after being compressed, it is dried and dehydrated by the compressed air post-processing equipment 3, and enters the compressed air storage tank 4 for buffering. The buffered compressed air is divided into two parts: compressed air and nitrogen making raw gas. Among them, the nitrogen making raw gas first flows through the raw gas inlet pressure-stabilizing regulating valve group 16, and the raw gas inlet pressure-stabilizing regulating valve group 16 includes a regulating valve (electric or pneumatic), a front and rear maintenance manual valve, and a manual bypass valve. After ensuring the stability of the pressure behind the valve to a certain extent (pressure-stabilizing regulation under the influence of the stability of other compressed air users), the compressed air after pressure stabilization enters the PSA nitrogen making machine 5 according to the established procedure to produce nitrogen of corresponding purity, and the nitrogen enters the nitrogen storage assembly, that is, the nitrogen storage tank 6 for storage.

[0042] The difference between the finished nitrogen and the traditional PSA process is that the original nitrogen external supply system is connected in parallel with a group of pressure-stabilizing gas storage modules. The finished gas can enter the nitrogen pressure-stabilizing gas storage component, i.e., the nitrogen pressure-stabilizing gas storage tank 17, for pressure stabilization under specified conditions through: the pneumatic second switch valve 7 (normal fully open state), the oil-free booster 8 (usually an oil-free piston machine), the third regulating valve 9, and the second check valve 10 (to prevent the reverse flow of high-pressure nitrogen). The pressure in the tank is within a certain range and can be appropriately adjusted according to actual conditions. A set of intelligent regulating valve group is configured at the outlet of the nitrogen pressure-stabilizing gas storage tank 17, including: a pneumatic first switch valve 11 (normally fully closed), a self-operated pressure reducing valve 12, and a second regulating valve 13 with a manual inspection valve and a manual bypass valve 14 before and after (normally fully closed, using a gate valve to avoid the problem of the valve not being able to be closed tightly). By connecting the valve group to a control system (such as a PLC, a microprocessor, a computer, etc.), the control system controls the opening and closing of the intelligent regulating valve group according to the demand-side parameters and the nitrogen external supply system parameters. In other embodiments, the exhaust pressure regulating component can also be composed of other structures, not limited to the above-mentioned valve group to form the exhaust pressure regulating component.

[0043] When the pressure-stabilizing gas storage system is in a normal state, it is in a relatively high-pressure stabilizing state. The imported oil-free booster 8 cooperates with the second switch valve 7, the third regulating valve 9, and the second check valve 10 to keep the pressure of the nitrogen pressure-stabilizing gas storage tank 17 stable under the specified value conditions under the condition that the first switch valve 11 is fully closed (taking leakage into consideration, if it is insufficient, some finished nitrogen will be pressurized); at the same time, since the system is in a normal operating state, the purity of the nitrogen in the pressure-stabilizing gas storage tank can be stably guaranteed.

[0044] Of course, for the sake of safety and smooth operation, regardless of cost, the oil-free booster 8 can be considered to be in a one-in-one-out-of-use mode (the pipeline valves are adjusted accordingly).

[0045] In principle, the pressure of the nitrogen pressure-stabilizing gas storage tank 17 should be able to ensure that the nitrogen pressure-stabilizing gas storage tank 17 can stably supplement the original nitrogen system with nitrogen of corresponding flow rate and purity through the valve group at the outlet within a certain time range. The tank pressure and volume of the nitrogen pressure-stabilizing gas storage tank 17 can be adjusted accordingly. In addition, considering the possible expansion refrigeration effect, it is possible to consider adding a heater at the outlet pressure reducing valve of the nitrogen pressure-stabilizing gas storage tank 17. Considering that the normal pressure of the nitrogen pressure-stabilizing gas storage tank 17 is higher than the pressure of the original nitrogen gas storage tank 6, a first check valve 15 is added at its outlet.

[0046] The versatility of this scheme for the three types of instability is as follows:

[0047] 1. The terminal nitrogen consumption is relatively stable, and the fluctuation is within the adjustable range of a single machine: In this case, the pressure-stabilizing gas storage tank does not need to intervene in the stability control. The stability of PSA is mainly achieved through the raw gas inlet pressure-stabilizing regulating valve group 16 and the first regulating valve 18. The function of the raw gas inlet pressure-stabilizing regulating valve group 16 is to ensure the stability of the nitrogen raw gas inlet pressure as much as possible when the other compressed air consumption fluctuates. After the inlet pressure is stable, considering the fluctuation of the terminal pressure, within a certain range, the pressure difference between the outlet pressure of the raw gas inlet pressure-stabilizing regulating valve group 16 and the inlet pressure of the first regulating valve 18 is stable, thereby ensuring that the PSA purity meets the requirements. From the perspective of control, the raw gas inlet controls its outlet pressure to be stable, and the first regulating valve 18 is used to control the pressure difference to be stable.

[0048] 2. For the second and third unstable situations described in the background technology, when the instantaneous demand for nitrogen at the end is greater than the rated gas production capacity, the PSA will automatically be in a release state because the nitrogen purity is difficult to reach the rated standard. However, the nitrogen supply must be guaranteed at this time. Once the PSA equipment releases, the pneumatic second switch valve 7, which was originally in the normally open state, is quickly closed, and the pneumatic first switch valve 11 is quickly opened. At this time, the oil-free booster is either shut down or unloaded (the inlet valve is closed). The high-pressure, high-purity nitrogen in the pressure-stabilizing tank first flows through the self-operated pressure reducing valve 12, and then passes through the second regulating valve 13 to ensure that the nitrogen supply pressure is stable within the corresponding time period. The limit must be until the pressure in the tank is equal to the demand pressure, which is the difference between the second and third instabilities.

[0049] For the second unstable working condition, the work of the pressure-stabilizing gas storage tank only needs to deal with the problem of short-term transient flow exceeding the standard. Once the PSA meets the commissioning conditions, it can be quickly cut in.

[0050] In the third case, the volume capacity of the pressure-stabilizing gas storage tank must be linked to the fluctuation law, that is, only when the terminal demand is small, the pressure-stabilizing system can pressurize to ensure the nitrogen pressure in the nitrogen pressure-stabilizing gas storage tank 17. Since the nitrogen pressure-stabilizing gas storage tank 17 stores high-purity nitrogen that is oil-free, water-free, and dust-free, the condensation problem can basically be ignored during the expansion process. However, it is still necessary to consider supplementing the heating link to cope with the refrigeration effect of the expansion process according to the actual situation to ensure the temperature of the finished nitrogen. Specifically, if the refrigeration benefit of the expansion needs to be further considered, it can be solved by adding a heater to the system. The operation of the heater is aimed at the problem of high-pressure nitrogen expansion refrigeration, and is controlled to maintain the nitrogen outlet temperature. The heater can usually be installed at the inlet end of the pressure reducing valve 12, which does not affect the basic operation mode from the perspective of the overall topological structure of the process.

[0051] The volume of the nitrogen pressure-stabilizing gas storage tank 17 needs to take into account the needs of the specified time period. For the PSA process system, a basic criterion is: according to the characteristics of the PSA adsorption nitrogen production device, the start-up time from startup to providing the corresponding purity finished gas is 30 minutes, and the thermal and mechanical losses during the expansion process, if the corresponding process instantaneous flow demand is Q nitrogen (unit Nm 3 / min), the volume of nitrogen pressure-stabilizing gas storage tank 17 is V storage (unit: m 3 ), the following formula is used to select the volume of the pressure-stabilizing gas storage tank: The volume of the gas storage tank in the pressure-stabilizing gas storage module is determined as follows: V 储 =α×t 时长 ×Q 氮 / (P 储 -P 氮 ), α is the selection correction coefficient, considering local loss and expansion loss, α ranges from 1.2 to 1.5; t 时长 The buffer time of the system is designed in minutes. According to the PSA characteristics, this time is designed to be 30 minutes. 氮 is the instantaneous flow demand value, P 储 The pressure value (gauge pressure) designed for the nitrogen pressure-stabilizing gas storage tank 17, P 氮 It is the pressure (gauge pressure) of nitrogen storage tank 6 when the PSA nitrogen production system is running.

[0052] The goal of this method is to ensure the pressure of the nitrogen system while fully considering local losses and expansion losses. This can be achieved by continuously outputting high-purity nitrogen to the system through the nitrogen pressure-stabilizing gas tank 17 during corresponding time periods.

[0053] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology in this field to understand the content of the utility model and implement it, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. PSA nitrogen production process pressure stabilization system, characterized by: The invention comprises a PSA nitrogen making system and a pressure-stabilizing gas storage module. The PSA nitrogen making system comprises a PSA nitrogen making machine (5) and a nitrogen gas storage component. The pressure-stabilizing gas storage module comprises a nitrogen pressure-stabilizing gas storage component, an exhaust pressure regulating component and a pressurizing component. The nitrogen pressure-stabilizing gas storage component and the nitrogen gas storage component are arranged in parallel with the PSA nitrogen making machine (5). The pressurizing component is used to pressurize the nitrogen output by the PSA nitrogen making machine (5). The pressurized nitrogen is stored in the nitrogen pressure-stabilizing gas storage component. When the terminal nitrogen demand is greater than the rated gas production capacity of the PSA nitrogen making system, the nitrogen in the nitrogen pressure-stabilizing gas storage component is pressure-regulated by the exhaust pressure regulating component and then supplies gas to the nitrogen demand end together with the nitrogen gas storage component.

2. The PSA nitrogen production process pressure stabilizing system according to claim 1, characterized in that: The PSA nitrogen making system further comprises a compressor (2), a compressed air post-processing device (3) and a compressed air storage tank (4) which are connected in sequence, and the compressed air storage tank (4) is connected to a PSA nitrogen making machine (5).

3. The PSA nitrogen production process pressure stabilizing system according to claim 2, characterized in that: A raw gas inlet pressure-stabilizing regulating valve group (16) is provided between the compressed air storage tank (4) and the PSA nitrogen generator (5). The function of the raw gas inlet pressure-stabilizing regulating valve group (16) is to ensure the stability of the nitrogen raw gas inlet pressure.

4. The PSA nitrogen production process pressure stabilizing system according to claim 3, characterized in that: The outlet end of the nitrogen gas storage assembly is provided with a first regulating valve (18), and the pressure difference between the raw gas inlet pressure-stabilizing regulating valve group (16) and the first regulating valve (18) is adjusted to ensure that the PSA purity meets the requirements.

5. The PSA nitrogen production process pressure stabilizing system according to any one of claims 1 to 4, characterized in that: The exhaust pressure regulating assembly comprises a first switch valve (11), a pressure reducing valve (12) and a second regulating valve (13).

6. The PSA nitrogen production process pressure stabilization system according to claim 5, characterized in that: The nitrogen pressure-stabilizing gas storage component is also connected to the nitrogen demand end via a bypass valve (14).

7. The PSA nitrogen production process pressure stabilization system according to claim 5, characterized in that: A temperature regulating module is arranged at the pressure reducing valve (12).

8. The PSA nitrogen production process pressure stabilizing system according to claim 6 or 7, characterized in that: A first check valve (15) is provided between the nitrogen gas storage assembly and the nitrogen pressure-stabilizing gas storage assembly.

9. The PSA nitrogen production process pressure stabilizing system according to claim 6 or 7, characterized in that: The boosting assembly comprises an oil-free booster (8), and the oil-free booster (8) is connected to a second switch valve (7), a third regulating valve (9) and a second check valve (10).

10. The PSA nitrogen production process pressure stabilization system according to claim 1, characterized in that: The booster components are arranged in two groups, with one in use and one as a backup.

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