Pressure swing adsorption nitrogen making equipment

Abstract

The utility model discloses pressure swing adsorption nitrogen making equipment, which relates to the technical field of nitrogen making machines and comprises two groups of adsorption towers, fixed seats are fixedly arranged at the inner bottom ends of the two groups of adsorption towers, air inlets are arranged at the bottom ends of the outer side walls of the adsorption towers in a penetrating manner, one ends of the air inlets extend into the fixed seats, and the other ends of the air inlets extend into the fixed seats. A gas outlet penetrates through the top end of the outer side wall of the adsorption tower. The two adsorption towers are arranged, the fixed net covers are arranged in the adsorption towers, the air inlets and the air outlets are formed in the two ends of the adsorption towers, the air inlet pipes and the air outlet pipes are arranged at the air inlets and the air outlets respectively, the first electromagnetic valves are arranged on the air inlet pipes and the air outlet pipes, and the two adsorption towers are connected and disconnected by controlling the first electromagnetic valves corresponding to the two adsorption towers. The switching of the working state of a single adsorption tower can be realized, so that the operation of another adsorption tower is not influenced while the carbon molecular sieve in the fixed net cover is replaced, and the continuity of nitrogen preparation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen generators, in particular to a pressure swing adsorption nitrogen generator. Background Art

[0002] Nitrogen generator refers to a device that uses air as raw material and uses physical methods to separate oxygen and nitrogen in the air to obtain nitrogen. It is widely used in the exploitation of the oil and gas industry, deep processing in the chemical industry, heat treatment in the metallurgical industry, fire prevention and fire fighting in the coal mining industry, and drug production and packaging in the pharmaceutical industry. Nitrogen generators used in industry can be divided into three types, namely cryogenic air separation, pressure swing adsorption (PSA) and membrane air separation; among them, pressure swing adsorption is also called molecular sieve air separation. The principle is to use the difference between the fast adsorption rate of carbon molecular sieve for oxygen and the slow adsorption rate for nitrogen to separate oxygen and nitrogen.

[0003] For example, a pressure swing adsorption nitrogen production equipment with a publication number of CN207498062U includes a first valve, an upper end cap, a first air storage room, an outer tank body, a first air inlet pipe, an inner tank body, a manhole, a second air inlet pipe, an air outlet pipe, a sealing plate, a second air storage room, a lower end cap, an exhaust gas collection box, a Roots vacuum pump, an air guide pipe, a pressure gauge, a second valve and a base. The beneficial effects of the utility model are: by filling the first air inlet pipe, the second air inlet pipe and the air outlet pipe with a carbon molecular sieve, oxygen and other impurity molecules in the air can be adsorbed, and then the oxygen and other impurity molecules are separated from the nitrogen, and then the nitrogen is purified; by setting the first air inlet pipe, the second air inlet pipe and the air outlet pipe, the contact time between the air and the carbon molecular sieve can be extended, so that the carbon molecular sieve can fully adsorb oxygen and other impurity molecules in the air; by using the Roots vacuum pump, the exhaust gas collection box can be in a negative pressure state, so that the oxygen adsorbed on the carbon molecular sieve can automatically enter the exhaust gas collection box.

[0004] The above technical solution needs to replace the molecular sieve in practical application, and nitrogen cannot be produced in this process. In addition, it has the function of cyclic adsorption and separation, and it produces nitrogen once. Such a nitrogen generator is difficult to effectively ensure the concentration and quality of nitrogen. Therefore, it is necessary to invent a pressure swing adsorption nitrogen generator to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a pressure swing adsorption nitrogen production equipment to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure swing adsorption nitrogen production equipment, comprising an adsorption tower, wherein two groups of adsorption towers are provided, and the inner bottom ends of the two groups of adsorption towers are fixedly provided with fixed seats, the bottom ends of the outer walls of the adsorption towers are penetrated with an air inlet, and one end of the air inlet extends to the interior of the fixed seat, the top ends of the outer walls of the adsorption towers are penetrated with an air outlet, and one end of the air outlet extends to the inner wall of the adsorption tower, a fixed mesh cover is provided above the fixed seat, and a carbon molecular sieve is provided inside the fixed mesh cover, a plurality of reinforcing rods are fixedly provided on the top end of the fixed mesh cover, a positioning seat is fixedly provided on the top end of the adsorption tower, and the positioning seat is provided at the outer top end of the fixed mesh cover, a sealing plug is provided above the positioning seat, and the sealing plug is fixedly connected to the positioning seat by bolts.

[0007] Preferably, a contact surface is provided at the top end of the outer wall of the fixing seat and the bottom end of the inner wall of the fixing mesh cover, and the contact surface is provided as an inclined structure.

[0008] Preferably, an air outlet pipe is provided at the outer top of each of the two adsorption towers, and both ends of the air outlet pipe are fixedly connected to the two air outlets respectively.

[0009] Preferably, an air inlet pipe is provided at the outer bottom end of the two adsorption towers, and both ends of the air inlet pipe are fixedly connected to the two air inlets respectively.

[0010] Preferably, a connecting pipe is fixedly provided in the middle of the air outlet pipe and the air inlet pipe, and a first solenoid valve is fixedly provided at both ends of the air outlet pipe and the air inlet pipe.

[0011] Preferably, a connecting pipe is fixedly provided between both ends of the air outlet pipe and the air inlet pipe, a pressure relief pipe is fixedly provided in the middle of the connecting pipe, and a second solenoid valve is fixedly provided on both sides of the connection between the pressure relief pipe and the connecting pipe.

[0012] Technical effects and advantages of the utility model:

[0013] 1. The utility model provides two adsorption towers, wherein a fixed mesh cover is provided inside the adsorption tower, and an air inlet and an air outlet are provided at both ends of the adsorption tower. Compressed air can pass through the air inlet, the air outlet and the fixed mesh cover to complete adsorption nitrogen production. An air inlet pipe and an air outlet pipe are respectively provided at the air inlet and the air outlet, and a first electromagnetic valve is provided on the air inlet pipe and the air outlet pipe. By controlling the on-off of the first electromagnetic valve corresponding to the two adsorption towers, the working state of a single adsorption tower can be switched, so that the operation of another adsorption tower is not affected while the carbon molecular sieve in the fixed mesh cover is replaced, thereby ensuring the continuity of nitrogen preparation;

[0014] 2. The utility model sets a connecting pipe between the air inlet pipe and the air outlet pipe, and installs a second solenoid valve on the connecting pipe. By controlling the on-off of the second solenoid valve, the adsorption tower can be connected with the outside air, so as to achieve pressure relief treatment inside the adsorption tower, so as to ensure that the impurities in the carbon molecular sieve in the fixed mesh cover are separated and automatically regenerated after pressure relief, so as to extend the maintenance period of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a schematic cross-sectional view of the adsorption tower structure of the utility model.

[0017] Figure 3 It is a schematic diagram of the structure of the adsorption tower of the utility model.

[0018] In the figure: 1. adsorption tower; 2. fixing seat; 3. air inlet; 4. air outlet; 5. fixed mesh cover; 6. reinforcing rod; 7. positioning seat; 8. sealing plug; 9. contact surface; 10. air outlet pipe; 11. air inlet pipe; 12. connecting pipe; 13. first solenoid valve; 14. connecting pipe; 15. pressure relief pipe; 16. second solenoid valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model provides Figure 1-3 A pressure swing adsorption nitrogen production equipment shown includes an adsorption tower 1, which is provided with two groups of adsorption towers 1. A fixed seat 2 is fixedly provided at the bottom end of the inner part of the two groups of adsorption towers 1. An air inlet 3 is penetrated through the bottom end of the outer wall of the adsorption tower 1, and one end of the air inlet 3 extends to the inside of the fixed seat 2. An air outlet 4 is penetrated through the top end of the outer wall of the adsorption tower 1, and one end of the air outlet 4 extends to the inner wall of the adsorption tower 1. A fixed mesh cover 5 is provided above the fixed seat 2, and a carbon molecular sieve is provided inside the fixed mesh cover 5. A plurality of reinforcing rods 6 are fixedly provided at the top end of the fixed mesh cover 5. The provision of the reinforcing rods 6 can improve the structural strength of the fixed mesh cover 5.

[0021] Specifically, a positioning seat 7 is fixedly provided at the top of the adsorption tower 1, and the positioning seat 7 is provided at the outer top of the fixed mesh cover 5, a sealing plug 8 is provided above the positioning seat 7, and the sealing plug 8 is fixedly connected to the positioning seat 7 by bolts, and a contact surface 9 is provided at the top of the outer wall of the fixed seat 2 and the bottom of the inner wall of the fixed mesh cover 5, and the contact surface 9 is provided as an inclined structure, and the setting of the inclined structure can increase the contact area between the fixed mesh cover 5 and the fixed seat 2, thereby improving the sealing between them;

[0022] More specifically, an air outlet pipe 10 is provided at the outer top of each of the two adsorption towers 1, and both ends of the air outlet pipe 10 are fixedly connected to the two air outlets 4, respectively; an air inlet pipe 11 is provided at the outer bottom of each of the two adsorption towers 1, and both ends of the air inlet pipe 11 are fixedly connected to the two air inlets 3, respectively; a connecting pipe 12 is fixedly provided at the middle of each of the air outlet pipe 10 and the air inlet pipe 11, and both ends of the air outlet pipe 10 and the air inlet pipe 11 are fixedly provided with a first solenoid valve 13, and by closing a group of the first solenoid valves 13, the working condition of one adsorption tower 1 can be controlled;

[0023] In addition, a connecting pipe 14 is fixedly provided between both ends of the air outlet pipe 10 and the air inlet pipe 11, a pressure relief pipe 15 is fixedly provided in the middle of the connecting pipe 14, and a second solenoid valve 16 is fixedly provided on both sides of the connection between the pressure relief pipe 15 and the connecting pipe 14. By closing the first solenoid valve 13 and opening the second solenoid valve 16, the adsorption tower 1 is connected with the outside air through the air inlet 3, the air outlet 4 and the connecting pipe 14, and the adsorption tower 1 completes the pressure relief.

[0024] Working principle of this utility model:

[0025] When the device is in use, compressed air enters the air inlet 3 through the connecting pipe 12 and the air inlet pipe 11, and then enters the interior of the fixed seat 2 and the fixed mesh cover 5. At this time, the compressed air passes through the carbon molecular sieve inside the fixed mesh cover 5 under pressure and enters the adsorption tower 1. In this process, oxygen and impurities in the compressed air are adsorbed by the carbon molecular sieve, and the remaining nitrogen is discharged from the device through the air outlet 4 and the air outlet pipe 10. At this time, the preparation of nitrogen can be achieved;

[0026] After the equipment has been running for a period of time, the carbon molecular sieve in the fixed mesh cover 5 tends to be saturated. At this time, the first solenoid valve 13 close to one end of an adsorption tower 1 is controlled to close the air outlet pipe 10 and the air inlet pipe 11, so that one adsorption tower 1 stops working. At this time, the sealing plug 8 can be opened and the carbon molecular sieve in the fixed mesh cover 5 can be replaced;

[0027] Moreover, when the carbon molecular sieve is not replaced, the first solenoid valve 13 can be closed and the second solenoid valve 16 can be opened so that the adsorption tower 1 is connected to the outside air through the air inlet 3, the air outlet 4, and the connecting pipe 14. At this time, the adsorption tower 1 completes pressure relief. During this process, the impurities adsorbed in the carbon molecular sieve in the fixed mesh cover 5 are separated to achieve the regeneration of the adsorption function of the carbon molecular sieve, thereby ensuring the subsequent nitrogen preparation.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A pressure swing adsorption nitrogen production device, comprising an adsorption tower (1), characterized in that: The adsorption tower (1) is provided with two groups, and the inner bottom ends of the two groups of adsorption towers (1) are fixedly provided with a fixed seat (2); the bottom end of the outer wall of the adsorption tower (1) is penetrated by an air inlet (3), and one end of the air inlet (3) extends to the inside of the fixed seat (2); the top end of the outer wall of the adsorption tower (1) is penetrated by an air outlet (4), and one end of the air outlet (4) extends to the inner wall of the adsorption tower (1); a fixed mesh cover (5) is provided above the fixed seat (2), and a carbon molecular sieve is provided inside the fixed mesh cover (5); a plurality of reinforcing rods (6) are fixedly provided at the top end of the fixed mesh cover (5); a positioning seat (7) is fixedly provided at the top end of the outer side of the fixed mesh cover (5); a sealing plug (8) is provided above the positioning seat (7), and the sealing plug (8) is fixedly connected to the positioning seat (7) by bolts.

2. A pressure swing adsorption nitrogen production equipment according to claim 1, characterized in that: A contact surface (9) is provided at the top end of the outer wall of the fixing seat (2) and the bottom end of the inner wall of the fixing mesh cover (5), and the contact surface (9) is arranged as an inclined structure.

3. A pressure swing adsorption nitrogen production equipment according to claim 2, characterized in that: An air outlet pipe (10) is provided at the outer top end of each of the two adsorption towers (1), and both ends of the air outlet pipe (10) are fixedly connected to the two air outlets (4) respectively.

4. A pressure swing adsorption nitrogen production equipment according to claim 3, characterized in that: An air inlet pipe (11) is provided at the outer bottom end of each of the two adsorption towers (1), and both ends of the air inlet pipe (11) are fixedly connected to the two air inlets (3) respectively.

5. A pressure swing adsorption nitrogen production equipment according to claim 4, characterized in that: A connecting pipe (12) is fixedly arranged at the middle of the air outlet pipe (10) and the air inlet pipe (11), and a first solenoid valve (13) is fixedly arranged at both ends of the air outlet pipe (10) and the air inlet pipe (11).

6. A pressure swing adsorption nitrogen production equipment according to claim 5, characterized in that: A connecting pipe (14) is fixedly arranged between both ends of the air outlet pipe (10) and the air inlet pipe (11), a pressure relief pipe (15) is fixedly arranged in the middle of the connecting pipe (14), and a second solenoid valve (16) is fixedly arranged on both sides of the connection between the pressure relief pipe (15) and the connecting pipe (14).

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