Pressure swing adsorption type automatic nitrogen making equipment

Abstract

The utility model discloses pressure swing adsorption type automatic nitrogen making equipment which comprises a first adsorption tower, a second adsorption tower, a carbon molecular sieve and a one-way filtering structure, when gas is introduced into the first adsorption tower or the second adsorption tower from bottom to top, the one-way filtering structure filters the gas, and filtered matters on the filtering structure are extracted before normal-pressure regeneration; the device comprises a barrel, and further comprises a first air inlet branch pipe, a second air inlet branch pipe, an air inlet input pipe, a first air inlet valve, a second air inlet valve, a first air outlet branch pipe, a second air outlet branch pipe, an output pipe, a pressure equalizing valve, a first middle pressure equalizing valve, a second middle pressure equalizing valve, a first lower pressure equalizing valve and a second lower pressure equalizing valve. Therefore, the stability of the molecular sieve filler in the tower is effectively ensured, and the purity of nitrogen is improved.

Description

Technical Field

[0001] The utility model relates to nitrogen making equipment, in particular to pressure swing adsorption type automatic nitrogen making equipment. Background Art

[0002] Pressure swing adsorption (PSA) is a new gas separation technology. Taking molecular sieve as an example, its principle is to separate gas mixtures by utilizing the differences in the molecular sieve's "adsorption" properties for different gas molecules. The PSA nitrogen generator is an automated device that uses carbon molecular sieve as an adsorbent and compressed air as a raw material to separate the oxygen in the air and obtain nitrogen using pressure swing adsorption technology.

[0003] In the pressure equalization stage, the valves of traditional PSA nitrogen generators generally move synchronously up and down. The instantaneous atmospheric flow has a great impact on the molecular sieve filler, and the airflow speed and airflow cannot be controlled. If the airflow speed is fast, it will cause great damage to the carbon molecules, resulting in poor nitrogen purification effect. In addition, when the raw air enters the adsorption tower, if there are impurities in the raw air, it is easy to block the molecular sieve. However, if a simple filtering structure is set up, the molecular sieve will be reintegrated into the tower body during regeneration.

[0004] Therefore, this case aims to provide a pressure swing adsorption automatic nitrogen production equipment, which can not only absorb the air pressure inside the barrel, allowing the air pressure to rise more stably, effectively ensure the stability of the molecular sieve filling material in the tower, and improve the purity of nitrogen, which is 20% higher than the output of traditional methods. At the same time, it can also make the air entering the molecular sieve relatively pure, and will not pollute the tower body even during the regeneration stage. Utility Model Content

[0005] The utility model provides a pressure swing adsorption type automatic nitrogen production equipment, which can effectively solve the above problems.

[0006] The utility model is achieved in this way:

[0007] A pressure swing adsorption automated nitrogen production device comprises: a first adsorption tower and a second adsorption tower, wherein a carbon molecular sieve is disposed inside each of the first adsorption tower and the second adsorption tower, and a one-way filter structure is disposed at the lower end of the carbon molecular sieve. When gas passes from bottom to top into the first adsorption tower or the second adsorption tower, the one-way filter structure filters the gas, and extracts the filtered material on the filter structure before regeneration at normal pressure;

[0008] The first adsorption tower and the second adsorption tower are respectively connected to the first air inlet branch pipe and the second air inlet branch pipe, the first air inlet branch pipe and the second air inlet branch pipe are connected to the air inlet input pipe, the first air inlet branch pipe and the second air inlet branch pipe are respectively provided with a first air inlet valve and a second air inlet valve, the tops of the first adsorption tower and the second adsorption tower are respectively connected to the output pipe through the first air outlet branch pipe and the second air outlet branch pipe, the first air outlet branch pipe and the second air outlet branch pipe are respectively connected to the first air outlet valve and the second air outlet valve, a pressure equalizing valve is connected between the first air outlet branch pipe and the second air outlet branch pipe, the sides of the first adsorption tower and the second adsorption tower are respectively connected to the first middle pressure equalizing valve and the second middle pressure equalizing valve, the lower ends of the first adsorption tower and the second adsorption tower are connected to the first lower pressure equalizing valve and the second lower pressure equalizing valve.

[0009] As a further improvement, the one-way filtration structure includes an annular disk located below the carbon molecular sieve and fixed to the inner walls of the first adsorption tower and the second adsorption tower. A filter element is provided on the inner side of the annular disk, and a reflection element is provided at the lower end of the filter element. The end of the reflection element is connected to the outside world.

[0010] As a further improvement, the annular disk includes an upper mounting frame for mounting the filter element, the lower end of the upper mounting frame is connected to a lower mounting frame, and an anti-separation member is provided on the inner side of the lower mounting frame.

[0011] As a further improvement, the filter element includes a filter plate connected to the inner side of the upper mounting frame, the filter plate is provided with a plurality of filter holes, the inner side of the filter holes is fixed with a filter membrane, and a plurality of adsorption columns are provided below the filter membrane.

[0012] As a further improvement, the anti-separation member includes a connecting plate connected to the lower mounting frame, the connecting plate is provided with through holes staggered with the filter holes, and suction pipes are provided directly below the filter holes, and all the suction pipes are connected to an external discharge pipe.

[0013] As a further improvement, the output pipe is connected to a nitrogen gas storage tank, and the gas outlet end of the nitrogen gas storage tank is connected to a pressure regulating valve and a flow meter.

[0014] As a further improvement, the first lower pressure equalizing valve and the second lower pressure equalizing valve are both connected to the muffler.

[0015] As a further improvement, a bypass valve connected in parallel with the pressure equalizing valve is further provided between the first gas outlet branch pipe and the second gas outlet branch pipe.

[0016] The beneficial effects of the utility model are:

[0017] The utility model discloses a nitrogen preparation device and method, which adopts a pressure swing adsorption method to prepare nitrogen, uses carbon molecular sieve as an adsorbent, and adopts a two-tower parallel connection and alternating pressurized adsorption and atmospheric pressure regeneration nitrogen preparation mode.

[0018] When air enters the adsorption tower, if a part of oil stains or other impurities is entrained in the air, the screening effect of the molecular sieve will be directly affected, and the molecular sieve cannot be regenerated. Therefore, the utility model discloses a one-way filtering structure at the lower end of the molecular sieve. Before the air contacts the molecular sieve in the tower body, the oil stains and impurities in the air are blocked in the one-way filtering structure, and the blocked impurities are immediately removed after the air passes through. In this process, the normal circulation of the gas is not hindered, so that the purity of the entering air can be ensured, the purification effect of the molecular sieve on the air is improved, and the purity of the nitrogen is indirectly improved.

[0019] The utility model discloses a phased use, first open the bypass valve of upper portion, and there is certain initial pressure at top, after gas enters, open the first middle part equalizing valve and the second middle part equalizing valve, better steady voltage is played, and the stability of the molecular sieve filling material in the tower is effectively guaranteed, and the nitrogen purity is improved, and the output is 20% higher than the traditional mode. ACCURACY

[0020] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be simply introduced to the drawing needed to be used in the embodiment, and it should be understood that the following drawing only shows some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled person in the art, other related drawings can be obtained according to these drawings without the creative labor.

[0021] Figure 1 It is the three-dimensional structure schematic diagram of the utility model.

[0022] Figure 2 It is the front view structure schematic diagram of the utility model.

[0023] Figure 3 It is the structure schematic diagram of the first adsorption tower of the utility model.

[0024] Figure 4 It is the plan view of the utility model Figure 3 .

[0025] Figure 5 It is the section view of A-A in the utility model Figure 4 .

[0026] Figure 6 It is a structural diagram of the filter element of the utility model.

[0027] Figure 7 It is a structural schematic diagram of the anti-separation component of the utility model.

[0028] In the picture:

[0029] First adsorption tower 1, first air inlet branch pipe 101, air inlet input pipe 102, first air outlet branch pipe 103, output pipe 104, first middle equalizing pressure valve 105, first lower equalizing pressure valve 106, second adsorption tower 2, second air inlet branch pipe 201, second air outlet branch pipe 202, second middle equalizing pressure valve 203, second lower equalizing pressure valve 204, equalizing valve 3, annular disk 401, upper mounting frame 4011, lower mounting frame 4012, filter element 402, filter plate 4021, filter hole 4022, filter membrane 4023, adsorption column 4024, anti-separation element 403, connecting disk 4031, through hole 4032, suction pipe 4033, external exhaust pipe 4034, nitrogen storage tank 5, muffler 6, bypass valve 7. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically specified.

[0032] Reference Figures 1 to 7As shown, a pressure swing adsorption automatic nitrogen production equipment includes: a first adsorption tower 1 and a second adsorption tower 2, wherein the interior of the first adsorption tower 1 and the second adsorption tower 2 are both provided with a carbon molecular sieve, and the lower end of the carbon molecular sieve is provided with a one-way filter structure. When the gas passes into the first adsorption tower 1 or the second adsorption tower 2 from bottom to top, the one-way filter structure filters the gas and extracts the filtered material on the filter structure before regeneration under normal pressure; the first adsorption tower 1 and the second adsorption tower 2 are respectively connected to a first air intake branch pipe 101 and a second air intake branch pipe 201, the first air intake branch pipe 101 and the second air intake branch pipe 201 are connected to an air intake input pipe 102, and the first air intake branch pipe 101 and the second air intake branch pipe 201 are connected to an air intake input pipe 102. 201 are respectively provided with a first air inlet valve and a second air inlet valve, the tops of the first adsorption tower 1 and the second adsorption tower 2 are respectively connected to the output pipe 104 through the first air outlet branch pipe 103 and the second air outlet branch pipe 202, the first air outlet branch pipe 103 and the second air outlet branch pipe 202 are respectively connected with the first air outlet valve and the second air outlet valve, a pressure equalizing valve 3 is connected between the first air outlet branch pipe 103 and the second air outlet branch pipe 202, the sides of the first adsorption tower 1 and the second adsorption tower 2 are respectively connected with the first middle pressure equalizing valve 105 and the second middle pressure equalizing valve 203, the lower ends of the first adsorption tower 1 and the second adsorption tower 2 are connected with the first lower pressure equalizing valve 106 and the second lower pressure equalizing valve 204.

[0033] In this embodiment, the output pipe 104 is connected to a nitrogen gas storage tank 5 , the gas outlet of the nitrogen gas storage tank 5 is connected to a pressure regulating valve and a flow meter, and the generated nitrogen is directly passed into the nitrogen gas storage tank 5 for storage.

[0034] In order to prevent the sound of the pressure-equalizing discharged gas from being too loud, the first lower pressure-equalizing valve 106 and the second lower pressure-equalizing valve 204 are both connected to the muffler 6 .

[0035] Furthermore, a bypass valve 7 connected in parallel with the pressure equalizing valve 3 is provided between the first gas outlet pipe 103 and the second gas outlet pipe 202 .

[0036] During the entire nitrogen production process, a staged valve control method is adopted. First, the upper bypass valve 8 is opened, and a certain initial pressure is generated at the top. After the gas enters, the first middle pressure equalizing valve 105 and the second middle pressure equalizing valve 203 are opened to achieve better pressure stabilization and flow limiting, effectively ensuring the stability of the molecular sieve filling material in the tower, while improving the nitrogen purity, which is 20% higher than the output of the traditional method. The overall workflow is divided into several parts, namely:

[0037] ①. The first adsorption tower 1 adsorbs, and the second adsorption tower 2 does not adsorb; compressed air enters the first adsorption tower 1 from the only opened air inlet input pipe 102 through the first air inlet valve on the first air inlet branch pipe 101 for pressure boost and pre-adsorption, starts the nitrogen production process and opens the first air outlet valve on the first air outlet branch pipe 103 to deliver the finished nitrogen into the nitrogen gas storage tank 5, and then delivers the finished nitrogen through the upper bypass valve 7 to analyze and purge the second adsorption tower 2, and then passes through the second lower pressure equalizing valve 204 and then through the muffler 6 to discharge the impurities into the atmosphere; ②. Inequality pressure equalization in stages; After the first adsorption tower 1 has been working for 40 seconds, the carbon molecular sieve is close to saturation, and first enters the upper flow limiting and pressure equalizing process of about 3 seconds. First, all valves are closed and only the pressure equalizing valve 3 is opened to enter the upper flow limiting and pressure equalizing process. After 3 seconds, the second air inlet valve and the first middle valve are opened. The equalizing valve 105 enters the upper middle inequality equalizing valve, and the high-pressure semi-finished nitrogen in the first adsorption tower 1 enters the second adsorption tower 2 through the second air inlet valve, the equalizing valve 3, and the first middle equalizing valve 105, so that the air pressure of the two adsorption towers is consistent (the pressure is about 3 to 4 kg), and the equalizing pressure is completed in about 2 seconds; ③. The second adsorption tower 2 adsorbs and the first adsorption tower 1 desorbs; open the second air inlet valve and the air inlet input pipe 102 to allow compressed air to enter the second adsorption tower 2 and start adsorption. The second air outlet valve is opened to send nitrogen into the nitrogen storage tank 5. At the same time, the impurities in the first adsorption tower 1 are discharged into the atmosphere by opening the bypass valve 7 and the first lower equalizing valve 106 until the second adsorption tower 2 completes the adsorption and closes all valves to enter the equalizing pressure operation; ④. Repeat the above steps to continuously produce nitrogen.

[0038] This embodiment uses a pressure swing adsorption method to produce nitrogen, employing carbon molecular sieve as the adsorbent. Two towers are connected in parallel, alternating between pressurized adsorption and atmospheric regeneration. Thus, while one tower is producing nitrogen, the other tower is regenerating, allowing the entire nitrogen production process to proceed continuously. Furthermore, a balanced pressure state is maintained throughout the production process, minimizing the burden on the molecular sieve and enabling long-term, stable use of the molecular sieve.

[0039] When the air enters the adsorption tower, if there is some oil or other impurities in the air, it will directly affect the screening effect of the molecular sieve and cannot be regenerated. Therefore, the utility model provides a one-way filtering structure at the lower end of the molecular sieve. Before the air is about to contact the molecular sieve in the tower body, the oil and impurities in the air are first blocked in the one-way filtering structure, and the blocked impurities are immediately removed after the air passes through. In this process, the normal circulation of the gas will not be hindered, thereby ensuring the purity of the incoming air, thereby improving the purification effect of the molecular sieve on the air, and indirectly improving the purity of the nitrogen.

[0040] In which, the one-way filtration structure includes an annular disk 401 located below the carbon molecular sieve and fixed to the inner walls of the first adsorption tower 1 and the second adsorption tower 2. A filter element 402 is provided on the inner side of the annular disk 401, and a reflection element 403 is provided at the lower end of the filter element 402. The end of the reflection element 403 is connected to the outside world. After each air enters, the filter element 402 will filter, and after each filtration, the reflection element 403 will quickly reflect the substances adhered to the reflection element 403, so that the filter element 402 will not re-incorporate these impurities into the tower body when the molecular sieve is regenerated.

[0041] During the entire filtering and de-separation process, the positions of the filter element 402 and the de-separation element 403 are fixed and are both through the annular disk 401. Therefore, the annular disk 401 includes an upper mounting frame 4011 for mounting the filter element 402, and the lower end of the upper mounting frame 4011 is connected to a lower mounting frame 4012, and the de-separation element 403 is arranged on the inner side of the lower mounting frame 4012.

[0042] During filtration, filtration is performed through two parts. Specifically, the filter element 402 includes a filter plate 4021 connected to the inner side of the upper mounting frame 4011. The filter plate 4021 is provided with a plurality of filter holes 4022. The inner side of the filter holes 4022 is fixedly connected with a filter membrane 4023. A plurality of adsorption columns 4024 are provided below the filter membrane 4023. The adsorption columns 4024 are used to adsorb the granular structure, while the filter membrane 4023 is used to filter and adsorb gaseous and liquid impurities such as oil.

[0043] After each filtration, the anti-separation is quickly performed. The anti-separation component 403 includes a connecting plate 4031 connected to the lower mounting frame 4012. The connecting plate 4031 is provided with a through hole 4032 staggered from the filter hole 4022. A suction pipe 4033 is provided directly below the filter hole 4022. All the suction pipes 4033 are connected to an external discharge pipe 4034. The suction pipe 4033 is located below the filter hole 4022. The dripping impurities and the impurities in the filter hole 4022 can be quickly taken away during extraction. The staggered through holes 4032 can ensure normal air inflow and normal pressure regeneration without blocking the flow path.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pressure swing adsorption automatic nitrogen production equipment, characterized in that: include: A first adsorption tower (1) and a second adsorption tower (2), wherein a carbon molecular sieve is provided inside the first adsorption tower (1) and the second adsorption tower (2), and a one-way filtering structure is provided at the lower end of the carbon molecular sieve, and when gas passes into the first adsorption tower (1) or the second adsorption tower (2) from bottom to top, the one-way filtering structure filters the gas, and extracts the filtered matter on the filtering structure before regeneration at normal pressure; The first adsorption tower (1) and the second adsorption tower (2) are respectively connected to a first air inlet branch pipe (101) and a second air inlet branch pipe (201); the first air inlet branch pipe (101) and the second air inlet branch pipe (201) are connected to an air inlet input pipe (102); the first air inlet branch pipe (101) and the second air inlet branch pipe (201) are respectively provided with a first air inlet valve and a second air inlet valve; the tops of the first adsorption tower (1) and the second adsorption tower (2) are respectively connected to an output pipe (104) via a first air outlet branch pipe (103) and a second air outlet branch pipe (202). The first gas outlet branch pipe (103) and the second gas outlet branch pipe (202) are connected, respectively, with a first gas outlet valve and a second gas outlet valve; a pressure equalizing valve (3) is connected between the first gas outlet branch pipe (103) and the second gas outlet branch pipe (202); the first adsorption tower (1) and the second adsorption tower (2) are connected on their lateral sides with a first middle pressure equalizing valve (105) and a second middle pressure equalizing valve (203); the lower ends of the first adsorption tower (1) and the second adsorption tower (2) are connected with a first lower pressure equalizing valve (106) and a second lower pressure equalizing valve (204).

2. A pressure swing adsorption automatic nitrogen production equipment according to claim 1, characterized in that: The one-way filtering structure comprises an annular disk (401) located below the carbon molecular sieve and fixedly connected to the inner walls of the first adsorption tower (1) and the second adsorption tower (2); a filter element (402) is provided on the inner side of the annular disk (401); a return element (403) is provided at the lower end of the filter element (402); and the end of the return element (403) is connected to the outside.

3. The pressure swing adsorption automatic nitrogen production equipment according to claim 2, characterized in that: The annular disk (401) comprises an upper mounting frame (4011) for mounting a filter element (402), the lower end of the upper mounting frame (4011) is connected to a lower mounting frame (4012), and an anti-separation member (403) is provided on the inner side of the lower mounting frame (4012).

4. The pressure swing adsorption automatic nitrogen production equipment according to claim 3, characterized in that: The filter element (402) includes a filter plate (4021) connected to the inner side of the upper mounting frame (4011), a plurality of filter holes (4022) are provided on the filter plate (4021), a filter membrane (4023) is fixed to the inner side of the filter hole (4022), and a plurality of adsorption columns (4024) are provided below the filter membrane (4023).

5. The pressure swing adsorption automatic nitrogen production equipment according to claim 4, characterized in that: The anti-separation member (403) includes a connecting plate (4031) connected to the lower mounting frame (4012), the connecting plate (4031) is provided with a through hole (4032) staggered with the filter hole (4022), and a suction pipe (4033) is provided directly below the filter hole (4022), and all the suction pipes (4033) are connected to an external discharge pipe (4034).

6. The pressure swing adsorption automatic nitrogen production equipment according to claim 1, characterized in that: The output pipe (104) is connected to a nitrogen gas storage tank (5), and the gas outlet end of the nitrogen gas storage tank (5) is connected to a pressure regulating valve and a flow meter.

7. The pressure swing adsorption automatic nitrogen production equipment according to claim 1, characterized in that: The first lower pressure equalizing valve (106) and the second lower pressure equalizing valve (204) are both connected to the muffler (6).

8. The pressure swing adsorption automatic nitrogen production equipment according to claim 1, characterized in that: A bypass valve (7) connected in parallel with the pressure equalizing valve (3) is further provided between the first gas outlet branch pipe (103) and the second gas outlet branch pipe (202).

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