PSA (Pressure Swing Adsorption) air separation nitrogen making machine for producing parylene

Abstract

The utility model discloses a PSA (Pressure Swing Adsorption) air separation nitrogen making machine for producing parylene. The PSA air separation nitrogen making machine comprises an air treatment system and a nitrogen making system, the air treatment system comprises an air extractor, a liquid storage tank, a drying machine, an air compressor and an air buffer tank which are arranged in sequence; the nitrogen generation system comprises a control unit, an adsorption tower and a nitrogen buffer tank. Dust, mechanical impurities, oil and other impurities in air are absorbed by arranging the liquid storage tank, strict purification treatment is conducted by arranging the filter, pure air is output to be dried and compressed, and clean compressed air is obtained; and the adsorption towers which are arranged in parallel are used for synchronously and alternately carrying out pressurized adsorption and decompressed desorption, so that continuous high-purity nitrogen is obtained. According to the device, the equipment is simplified, and meanwhile, high-purity nitrogen is prepared.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen generators, in particular to a PSA air separation nitrogen generator for producing parylene. Background Art

[0002] Parylene is the most effective moisture-proof, mildew-proof, anti-corrosion and anti-salt spray coating material at present. In the production process of parylene, a PSA air separation nitrogen generator is required. PSA (Pressure Swing Adsorption) is a new gas separation technology, which has developed rapidly abroad since the late 1960s and early 1970s. Its principle is to separate gas mixtures by using the difference in the "adsorption" performance of molecular sieves for different gas molecules. Taking air as raw material, the selective adsorption performance of a high-efficiency and high-selectivity solid adsorbent for nitrogen and oxygen is used to separate nitrogen and oxygen in the air.

[0003] For example, a Chinese patent with the publication number CN 116236880 A discloses a PSA nitrogen generator, which includes a tripod. The upper part of the tripod is fixedly connected with a tank body. There is a cleaning mechanism at the bottom of the tank body. There are wind blades inside the tank body. There is a filter screen inside the tank body. There is a striking hammer above the filter screen. There is a conveyor belt below the filter screen, and the conveyor belt is used to collect impurities on the filter screen. There is a top cover at the upper part of the tank body. There are an air inlet pipe and an air outlet pipe at the left part of the tank body. There is a funnel at the bottom of the tank body. There is a molecular sieve at the upper part of the tank body, which can accelerate the air flow, clean the large-particle sundries at the bottom of the device and transport them to the outside of the device, clean and collect the small-particle sundries on the filter screen and transport them to the outside of the device, so as to improve the filtering effect of the filter screen and the nitrogen extraction rate. Although this device is provided with a cleaning mechanism to timely collect and remove the sundries on the filter screen, it needs to be provided with four motors at the same time, resulting in a very complex structure.

[0004] For another example, a Chinese patent with the publication number CN 220214437 U discloses a low - energy - consumption PSA air separation nitrogen - making device, which includes an air inlet device, an adsorption device, and a pressurization device connected in sequence. It is characterized in that the air inlet device includes a first booster and a dryer arranged in series, the adsorption device includes a first adsorption tower and a second adsorption tower arranged in parallel, the bottoms of the first adsorption tower and the second adsorption tower are connected to an air release device, the pressurization device includes a nitrogen buffer tank, a second booster, and a high - pressure nitrogen tank. The first booster is used to compress air to a first pressure, and the second booster is used to compress nitrogen from the nitrogen buffer tank to a second pressure. This device can achieve energy conservation and consumption reduction without reducing the pressure of the finally obtained product nitrogen. Compared with the existing PSA air separation nitrogen - making device, it can reduce energy consumption by about 10% - 11%, and the energy - saving effect is obvious. Although this device has a good energy - saving effect, it lacks the treatment of impurities such as dust, mechanical impurities, and oil in the air, resulting in the failure to remove impurities in the prepared nitrogen.

[0005] It can be seen from the above inventions that in the preparation process of parylene, it is necessary to design a PSA air separation nitrogen - making machine with a relatively simple structure so that there are no impurities in the prepared nitrogen. Summary of the Invention

[0006] The purpose of the present utility model is to solve the deficiencies of the prior art and provide a PSA air separation nitrogen - making machine for producing parylene.

[0007] To achieve the above - mentioned purpose, the present utility model provides the following technical solutions:

[0008] A PSA air separation nitrogen - making machine for producing parylene includes an air treatment system and a nitrogen - making system;

[0009] The air treatment system includes a suction machine, a liquid storage tank, a dryer, an air compressor, and an air buffer tank placed in sequence; the suction machine is connected to the bottom of the liquid storage tank, the top of the liquid storage tank is connected to the bottom of the dryer, the top of the dryer is connected to the air compressor, and the air compressor is connected to the air buffer tank through high - pressure air pipes; half of the capacity of industrial alcohol is set at the bottom of the liquid storage tank; a spiral heating pipe is arranged in the dryer;

[0010] The nitrogen - making system includes a control unit, an adsorption tower, and a nitrogen buffer tank; the control unit is arranged between the air buffer tank and the adsorption tower, the adsorption tower is composed of a first adsorption tower and a second adsorption tower arranged in parallel, and carbon molecular sieves are arranged below the interior of the adsorption tower.

[0011] Preferably, the control unit is connected to an intake air three - way valve through a pipeline, and then connected to the intake air ports arranged at the bottoms of the first adsorption tower and the second adsorption tower of the adsorption tower.

[0012] By adopting the above technical solution, the compressed air discharged from the air buffer tank first passes through the control unit, then through the intake three-way valve, and enters the first adsorption tower and the second adsorption tower of the adsorption tower from the intake ports at the bottoms of the first adsorption tower and the second adsorption tower of the adsorption tower respectively.

[0013] Preferably, the top outlets of the first adsorption tower and the second adsorption tower of the adsorption tower are connected to the exhaust three-way valve through pipelines, and then connected to the nitrogen buffer tank.

[0014] By adopting the above technical solution, the nitrogen gas prepared by the adsorption tower passes through the top outlet, and then enters the nitrogen buffer tank through the second three-way valve respectively.

[0015] Preferably, exhaust ports are provided at the bottoms of the first adsorption tower and the second adsorption tower of the adsorption tower, and the exhaust ports are connected to the vent three-way valve through pipelines and then connected to the atmosphere.

[0016] By adopting the above technical solution, after the vent three-way valve is opened, the adsorption tower starts pressure reduction desorption, and the adsorbed oxygen, carbon dioxide and water are detached from the molecular sieve micropores and sequentially pass through the exhaust port, the pipeline and the vent three-way valve and are discharged into the atmosphere.

[0017] Preferably, relevant buttons are provided on the control unit to control the opening of the intake three-way valve, the exhaust three-way valve and the vent three-way valve respectively with the first adsorption tower and the second adsorption tower of the adsorption tower.

[0018] By adopting the above technical solution, the control unit controls the opening of the first adsorption tower and the second adsorption tower of the adsorption tower to ensure that when one adsorption tower is performing pressurized adsorption work, the other adsorption tower is performing pressure reduction desorption, and the two parallel adsorption towers alternately perform pressurized adsorption and pressure reduction desorption, so as to obtain continuous high-purity nitrogen.

[0019] Preferably, industrial alcohol is provided at the bottom of the liquid storage tank, and after a filter is provided at the top, it is connected to the dryer through a high-pressure air pipe.

[0020] By adopting the above technical solution, air enters the liquid storage tank after passing through the air extractor, and dust, mechanical impurities and oil in the air are absorbed by the industrial alcohol, and then other impurities are absorbed and filtered by the filter to ensure that the air entering the dryer is pure air.

[0021] The beneficial effects of the present utility model are:

[0022] The utility model provides a PSA air separation nitrogen generator for producing parylene. By setting a liquid storage tank to absorb impurities such as dust, mechanical impurities and oil in the air, and then setting a filter for strict purification treatment, pure air is output for drying and compression to obtain clean compressed air; then, through adsorption towers arranged in parallel, pressurized adsorption and depressurized desorption are carried out synchronously and alternately, so as to obtain continuous high-purity nitrogen. Description of the Drawings

[0023] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0024] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0025] Figure 1 It is a schematic structural diagram of a PSA air separation nitrogen generator for producing parylene proposed by the present utility model.

[0026] Figure 1 As shown in the figure: 1. Air treatment system, 2. Nitrogen production system, 11. Air extractor, 12. Liquid storage tank, 13. Dryer, 14. Air compressor, 15. Air buffer tank, 21. Control unit, 22. Adsorption tower, 23. Nitrogen buffer tank. Detailed Embodiments

[0027] In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0029] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0030] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0032] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "linked" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0033] Refer to Figure 1, a PSA air separation nitrogen generator for producing parylene disclosed by the present utility model, comprises an air treatment system 1 and a nitrogen production system 2; the air treatment system 1 includes a gas pump 11, a liquid storage tank 12, a dryer 13, an air compressor 14 and an air buffer tank 15 which are arranged in sequence; a high-pressure air pipe is connected to the gas pump 11, the liquid storage tank 12, the dryer 13, the air compressor 14 and the air buffer tank 15 in sequence; the gas pump 11 is used for pumping air into the liquid storage tank 12, when the air passes through the industrial alcohol stored in the liquid storage tank 12, impurities such as dust, mechanical impurities and oil in the air are absorbed, and when passing through the filter at the top of the liquid storage tank 12, it is further purified, the purified air enters the dryer 13 and is dried from bottom to top by a spiral heating pipe, and then enters the air compressor 14, after being compressed, it becomes clean compressed air and enters the air buffer tank 15.

[0034] The nitrogen production system 2 includes a control unit 21, an adsorption tower 22 and a nitrogen buffer tank 23; a control unit 21 is arranged between the air buffer tank 15 and the adsorption tower 22, an outlet is arranged at the top of the adsorption tower 22 arranged in parallel, and is used for connecting the prepared nitrogen to an exhaust three-way valve through a pipeline and then entering the nitrogen buffer tank 23; an air inlet and an exhaust port are arranged at the bottom of the adsorption tower 22, the control unit 21 is connected to the air inlet three-way valve through a pipeline and then communicates with the air inlet, and compressed air can enter the adsorption tower 22 through this air inlet, the exhaust port is connected to an emptying three-way valve through a pipeline and then connected to the atmosphere, and the compressed air is discharged from the adsorption tower 22 to the air through this exhaust port.

[0035] In an optional embodiment, carbon molecular sieve is arranged below the interior of the adsorption tower 22. When performing pressure swing adsorption, when the compressed air passes upward through the carbon molecular sieve from the bottom of the adsorption tower 22, oxygen molecules with smaller diameters diffuse faster and enter the solid phase of the molecular sieve. At the same time, adsorbents such as activated carbon in the carbon molecular sieve adsorb impurities such as carbon dioxide in the micropores of the molecular sieve, and the nitrogen-rich component - nitrogen can be obtained in the passing gas phase, and it is connected to the exhaust three-way valve from the top outlet of the adsorption tower 22 and then enters the nitrogen buffer tank 23; when performing pressure swing desorption, when the compressed air is discharged from the air outlet, the pressure is reduced to release the adsorption of oxygen and carbon dioxide and other impurities by the carbon molecular sieve, and the oxygen, carbon dioxide and other impurities adsorbed in the micropores of the molecular sieve are detached from the micropores of the molecular sieve and discharged into the atmosphere along with the compressed air.

[0036] The working process of the PSA air separation nitrogen generator for producing parylene provided by this embodiment is as follows:

[0037] 1. Air treatment: Air is pumped into the liquid storage tank 12 by the gas pump 11, the industrial alcohol absorbs impurities such as dust, mechanical impurities and oil in the air, is further purified when passing through the filter, then enters the dryer 13, and is heated and dried in the spiral heating pipe during the upward rising process from bottom to top, and then enters the air compressor 14, after being compressed, it becomes clean compressed air and enters the air buffer tank 15.

[0038] 2. Pressurized adsorption in the first adsorption tower: The clean compressed air enters the first adsorption tower from the air buffer tank 15 through the control unit 21. The control unit 21 opens the intake three-way valve and enters the first adsorption tower from the bottom intake port of the first adsorption tower of the adsorption tower 22. When passing through the carbon molecular sieve in the first adsorption tower, impurities such as oxygen and carbon dioxide are adsorbed in the molecular sieve micropores of the carbon molecular sieve, while nitrogen passes through the carbon molecular sieve to reach the top outlet of the first adsorption tower, and then enters the nitrogen buffer tank 23 through the pipeline connected to the exhaust three-way valve.

[0039] 3. Pressurized adsorption in the second adsorption tower and decompression desorption in the first adsorption tower: After step 2 is carried out for 60 s, the control unit 21 opens the intake three-way valve and enters the second adsorption tower from the bottom intake port of the second adsorption tower of the adsorption tower 22, and the intake port of the first adsorption tower is closed; when the compressed air passes through the carbon molecular sieve in the second adsorption tower, impurities such as oxygen and carbon dioxide are adsorbed in the molecular sieve micropores of the carbon molecular sieve, while nitrogen passes through the carbon molecular sieve to reach the top outlet of the second adsorption tower, and then enters the nitrogen buffer tank 23 through the pipeline connected to the exhaust three-way valve; at the same time, the control unit 21 opens the vent three-way valve to open the bottom outlet of the first adsorption tower, and the first adsorption tower performs decompression desorption, reducing the pressure to release the adsorption of impurities such as oxygen and carbon dioxide by the carbon molecular sieve. The impurities such as oxygen and carbon dioxide adsorbed in the molecular sieve micropores are detached from the molecular sieve micropores and discharged into the atmosphere through the pipeline passing through the vent three-way valve from the exhaust port of the first adsorption tower along with the compressed air.

[0040] 4. Pressurized adsorption in the first adsorption tower and decompression desorption in the second adsorption tower: After step 3 is carried out for 60 s, the control unit 21 opens the intake three-way valve and enters the first adsorption tower from the bottom intake port of the first adsorption tower of the adsorption tower 22, and the intake port of the second adsorption tower is closed; when the compressed air passes through the carbon molecular sieve in the first adsorption tower, impurities such as oxygen and carbon dioxide are adsorbed in the molecular sieve micropores of the carbon molecular sieve, while nitrogen passes through the carbon molecular sieve to reach the top outlet of the first adsorption tower, and then enters the nitrogen buffer tank 23 through the pipeline connected to the exhaust three-way valve; at the same time, the control unit 21 opens the vent three-way valve to open the bottom outlet of the second adsorption tower, and the second adsorption tower performs decompression desorption, reducing the pressure to release the adsorption of impurities such as oxygen and carbon dioxide by the carbon molecular sieve. The impurities such as oxygen and carbon dioxide adsorbed in the molecular sieve micropores are detached from the molecular sieve micropores and discharged into the atmosphere through the pipeline passing through the vent three-way valve from the exhaust port of the second adsorption tower along with the compressed air.

[0041] Thus, steps 3 and 4 are repeated, and the pressurized adsorption and decompression desorption processes are alternately carried out synchronously by the first adsorption tower and the second adsorption tower arranged in parallel, so as to obtain continuous high-purity nitrogen.

[0042] Certainly, the embodiments of this specific implementation manner are all preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A PSA nitrogen generator for producing parylene, characterized in that: It includes an air treatment system (1) and a nitrogen generation system (2); The air treatment system (1) includes a suction pump (11), a liquid storage tank (12), a dryer (13), an air compressor (14), and an air buffer tank (15) arranged in sequence. The suction pump (11) is connected to the bottom of the liquid storage tank (12), the top of the liquid storage tank (12) is connected to the bottom of the dryer (13), the top of the dryer (13) is connected to the air compressor (14), and the air compressor (14) is connected to the air buffer tank (15) through high-pressure air pipes. Half of the capacity of industrial alcohol is provided at the bottom of the liquid storage tank (12). A spiral heating pipe is arranged in the dryer (13); The nitrogen generation system (2) includes a control unit (21), an adsorption tower (22), and a nitrogen buffer tank (23). The control unit (21) is arranged between the air buffer tank (15) and the adsorption tower (22). The adsorption tower (22) is a first adsorption tower and a second adsorption tower arranged in parallel, and carbon molecular sieves are arranged below the interior of the adsorption tower (22).

2. The PSA nitrogen generation machine for producing parylene according to claim 1, characterized in that: The control unit (21) is connected to an intake three-way valve through a pipe, and then communicates with the intake ports arranged at the bottoms of the first adsorption tower and the second adsorption tower of the adsorption tower (22).

3. The PSA nitrogen generation machine for producing parylene according to claim 2, characterized in that: The top outlets of the first adsorption tower and the second adsorption tower of the adsorption tower (22) are connected to an exhaust three-way valve through pipes, and then connected to the nitrogen buffer tank (23).

4. A PSA nitrogen generation machine for producing parylene according to claim 3, characterized in that: Exhaust ports are arranged at the bottoms of the first adsorption tower and the second adsorption tower of the adsorption tower (22). The exhaust ports are connected to a vent three-way valve through pipes and then connected to the atmosphere.

5. The PSA nitrogen generation machine for producing parylene according to claim 4, characterized in that: Relevant buttons are arranged on the control unit (21) to control the opening of the intake three-way valve, the exhaust three-way valve, and the vent three-way valve with respect to the first adsorption tower and the second adsorption tower of the adsorption tower (22).

6. The PSA nitrogen generator for producing parylene according to claim 1, wherein: Industrial alcohol is provided at the bottom of the liquid storage tank (12), and after a filter is arranged at the top, it is connected to the dryer (13) through a high-pressure air pipe.

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