Nitrogen purification device

Abstract

The invention relates to the field, in particular to a nitrogen purification device which comprises a pretreatment mechanism; a buffer tank; and a purification mechanism; the purification mechanism comprises an adsorption tank I, an adsorption tank II, a shunting assembly arranged on the adsorption tank I and the adsorption tank II, and a gas pipeline for communicating the adsorption tank I, the adsorption tank II and the buffer tank; a pressure gauge is mounted on the gas pipeline; the pressure gauge is electrically connected with a controller, the controller is used for removing impurities from the obtained pressure intensity information, generating adjusting information according to the data after impurity removal and sending the adjusting information to the shunting assembly, and the shunting assembly is used for shunting. According to the device, the air cylinder drives the moving rod to move, so that the angle of the rotating plate is changed, the flow direction of airflow is changed, and the air suction mechanism and the secondary pressure reduction mechanism are linked; the airflow is equalized for three times and decompressed for two times, so that insufficient nitrogen purity and even damage to the molecular sieve caused by pressure intensity are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of purification, and in particular to a nitrogen purification device. Background Art

[0002] PID is a classic automatic control algorithm, the full name of which is Proportional-Integral-Derivative control. It calculates the error between the target value and the actual value, and uses three adjustment methods: proportional, integral and differential to control the output of the system so that the system reaches the desired state.

[0003] The existing PID algorithm will automatically generate an adjustment value and send it to the power mechanism to complete the adjustment so that the equipment can operate in a stable state.

[0004] Chinese patent application number 202311053863.0 discloses a new type of PSA replacement equipment for CO purification, including a lower tower body and a tower top detachably connected to the lower tower body, the lower tower body is provided with an air inlet pipe, and the tower top is provided with an air outlet pipe; a pair of support structures for accommodating adsorbents and arranged in parallel are detachably connected in the lower tower body, and a flow guide device matched with the support structure is also detachably connected in the lower tower body; the flow guide device includes a rotating shaft rotatably connected to the lower tower body, a driving fan blade matched with the air inlet pipe is fixedly connected to the rotating shaft, and a flow guide structure for equalizing the airflow is connected to the driving fan blade; the flow guide structure includes a lower spline fixedly connected to the rotating shaft, an inner guide plate is fixedly connected to the rotating shaft, and a middle guide plate and an outer guide plate are slidably connected to the lower spline; the present invention effectively solves the problem that the uniformity of airflow is poor and the adsorbent is easily damaged when the existing replacement equipment is in use.

[0005] In the process of nitrogen adsorption and separation, activated carbon is selected as the molecular sieve, and the working pressure is relatively high.

[0006] The existing regulation only adjusts the uniformity of airflow through the PID algorithm. The Chinese patent application number 202311053863.0 adjusts the uniformity of airflow, but does not judge the adjustment amount. If the pressure difference of the airflow is large, it will have the opposite effect.

[0007] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the invention

[0008] The object of the present invention is to provide a nitrogen purification device which can effectively solve the above technical problems.

[0009] In order to achieve the purpose of the present invention, the following technical scheme is adopted:

[0010] A nitrogen purification device, comprising:

[0011] Pretreatment mechanism; buffer tank; and, purification mechanism;

[0012] The purification mechanism comprises: an adsorption tank 1, an adsorption tank 2, a flow dividing assembly arranged on the adsorption tank 1 and the adsorption tank 2, and a gas transmission pipeline connecting the adsorption tank 1, the adsorption tank 2 and the buffer tank;

[0013] A pressure gauge is installed on the gas pipeline;

[0014] The pressure gauge is electrically connected to a controller, which removes impurities from the acquired pressure information, generates adjustment information based on the removed data, and sends the adjustment information to the diversion component, which performs diversion.

[0015] Further: The specific steps for generating adjustment information are:

[0016] Step S1: collecting pressure information of the pressure gauge;

[0017] Step S2: Definition: u(t) is the adjustment information; Fm is the air pressure gain; Fd is the air pressure integral; Fc is the air pressure differential; Ha is the preset pressure; Hb is the pressure information of the pressure gauge;

[0018] but:

[0019] b(t) = Ha-Hb;

[0020] According to the feedback adjustment algorithm, b(t) is substituted to obtain:

[0021] u(t)=Fm*b(t)+Fd*∫b(t)dt+Fc*(b(t) / dt);

[0022] Step S3: Input u(t) into the threshold comparison center. If u(t) is greater than the preset threshold, issue instruction one, otherwise issue instruction two.

[0023] Further: the diversion assembly includes: a flow pipe connected to the gas supply pipeline, a movable rod moving along its axial direction, a wind shield fixedly connected to the movable rod, a rotating plate pivotally connected to the wind shield, and the other end of the rotating plate is pivotally connected to the inner wall of adsorption tank one or adsorption tank two.

[0024] Further: the end of the moving rod is fixedly connected to a moving plate, the moving plate is fixedly connected to a push rod, the end of the push rod is fixedly connected to a push plate, the push plate is in sliding contact with the inner wall of the cylinder, and the push plate moves in the cylinder, and the cylinder is provided with an air inlet pipe and an air outlet pipe;

[0025] The push plate draws gas into the cylinder through the air inlet pipe and discharges the gas through the air outlet pipe.

[0026] Further: two air inlet pipes are provided and are located at both ends of the cylinder, and a check piece is provided between the air inlet pipe and the cylinder.

[0027] Further: the air outlet pipe is located in the middle of the cylinder.

[0028] Further: the cylinder is fixedly installed on a fixed plate, a flow channel is fixedly installed on the fixed plate, a shielding member 1 is fixedly installed inside the flow channel, a shielding member 2 is fixedly installed on the movable plate, and the shielding member 1 is adapted to the shielding member 2.

[0029] Further: the first shielding member is provided with a second through hole, and the second shielding member is inserted into the second through hole.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] In the nitrogen purification device of the present invention, the cylinder drives the moving rod to move, so that the angle of the rotating plate is changed, the flow direction of the airflow is changed, and the air suction mechanism and the secondary pressure reduction mechanism are linked; the airflow is equalized three times and the pressure is reduced twice, so as to prevent the nitrogen purity from being insufficient due to the pressure, and even damage the molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0033] Figure 1 Schematic diagram of the nitrogen purification device of the present invention.

[0034] Figure 2 It is a schematic diagram of an adsorption tank 1 of the nitrogen purification device of the present invention.

[0035] Figure 3 It is a half-section axonometric schematic diagram of an adsorption tank 1 of the nitrogen purification device of the present invention.

[0036] Figure 4 for Figure 3 Enlarged schematic diagram of part A.

[0037] Figure 5 It is a cross-sectional view of an adsorption tank 1 of the nitrogen purification device of the present invention.

[0038] Figure 6 for Figure 5 Schematic diagram of the enlarged portion B.

[0039] Figure 7 It is a schematic diagram of some parts of the air intake mechanism of the nitrogen purification device of the present invention.

[0040] Figure 8 It is a schematic diagram of some parts of the secondary decompression mechanism of the nitrogen purification device of the present invention.

[0041] In the figure: 1. pretreatment mechanism; 2. buffer tank; 3. adsorption tank 1; 4. adsorption tank 2; 5. gas transmission pipeline; 6. electric control box; 7. flow pipe; 8. cylinder; 9. moving rod; 10. moving plate; 11. supporting filter; 12. wind shield; 13. rotating plate; 14. supporting member; 15. fixed plate; 16. cylinder; 17. push plate; 18. push rod; 19. air inlet pipe; 20. air outlet pipe; 21. flow channel; 22. shielding member 1; 23. shielding member 2. DETAILED DESCRIPTION

[0042] 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. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments.

[0043] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0044] like Figures 1 to 8 As shown, the nitrogen purification device of the present invention comprises: a pretreatment mechanism 1; a buffer tank 2; and a purification mechanism; the pretreatment mechanism 1 is of an existing conventional design, which removes oil, impurities and heat from the air, and the pretreated air enters the buffer tank 2, is pressurized in the buffer tank 2, and then enters the purification mechanism.

[0045] The purification mechanism includes: an adsorption tank 1 3, an adsorption tank 2 4, a diversion component, a gas pipeline 5 and an electric control box 6. The structure of the adsorption tank 1 3 is the same as that of the adsorption tank 2 4, that is, when the adsorption tank 1 3 is purifying, the adsorption tank 2 4 is analyzing, so that continuous production can be achieved.

[0046] The flow diversion component is arranged on the adsorption tank 1 3 and the adsorption tank 2 4 . A support filter 11 is arranged inside the adsorption tank 1 3 and the adsorption tank 2 4 . The support filter 11 is filled with a molecular sieve.

[0047] It should be explained here that the gas pipeline 5 is only a general term, which includes but is not limited to: an intake pipeline, an exhaust pipeline, a return pipeline, etc. Since the gas pipeline 5 is an existing mature design and the present invention does not involve pipeline optimization, it will not be described in detail here.

[0048] The electric control box 6 is used for intelligent control of the purification mechanism. The controller inside the electric control box 6 can control the opening and closing of the solenoid valve, thereby controlling the opening and closing of the bypass gas path by opening or closing the solenoid valve, and further controlling the opening and closing of the pneumatic angle valve to achieve the purpose of controlling the gas pipeline 5.

[0049] A pressure gauge is installed on the air inlet pipe to detect the pressure entering the adsorption tank 1 3 and the adsorption tank 2 4. If the pressure entering the adsorption tank 1 3 and the adsorption tank 2 4 is too high, the gas flow rate will increase, reducing the contact time between the gas and the molecular sieve, resulting in poor purification effect.

[0050] It should be explained here that the pressure of the gas coming out of the buffer tank 2 is dynamically changing. On the one hand, it is subject to the performance of the pretreatment mechanism 1 itself, and on the other hand, it is subject to the performance of the pressurizing device connected to the buffer tank 2 itself. Therefore, it is necessary to perform PID adjustment on the pressure entering the adsorption tank 1 3 and the adsorption tank 2 4.

[0051] The pressure gauge is electrically connected to a controller, and the controller is a PID controller. The controller purifies the acquired pressure information, generates adjustment information based on the purified data, and sends the adjustment information to the diversion component, and the diversion component performs diversion.

[0052] The specific steps to generate reconciliation information are:

[0053] Step S1: Collecting pressure information from a pressure gauge.

[0054] Step S2: remove impurities from the pressure information. When removing impurities, it is necessary to determine the extreme value of the pressure information, that is, to set the closing condition. When the pressure information is less than the minimum value or greater than the maximum value, the air intake pipe is closed to prevent the nitrogen purity from being insufficient due to the pressure, or even damage the molecular sieve; therefore, it is necessary to remove impurities from the data to obtain pressure data, recorded as y[n], then:

[0055]

[0056] Among them: upper_limit is the maximum value, lower_limit is the minimum value.

[0057] Step S2: Definition: u(t) is the adjustment information; Fm is the air pressure gain; Fd is the air pressure integral; Fc is the air pressure differential; Ha is the preset pressure; Hb is the pressure information of the pressure gauge;

[0058] but:

[0059] b(t) = Ha-Hb;

[0060] According to the feedback adjustment algorithm, b(t) is substituted to obtain:

[0061] u(t)=Fm*b(t)+Fd*∫b(t)dt+Fc*(b(t) / dt);

[0062] Fm, Fd and Fc are self-tuning and can adopt the existing Ziegler-Nichols algorithm, which will not be elaborated in detail in the present invention.

[0063] Step S3: input u(t) into the threshold comparison center. If u(t) is greater than the preset threshold, which is the pressure information fluctuation threshold, instruction one is issued, otherwise instruction two is issued. When u(t) is greater than the preset threshold, it means that the pressure fluctuation is large, and the pressure may still be large after diversion, which may cause the nitrogen purity to be insufficient or even damage the molecular sieve. It should be noted here that instruction one is that the diversion component does not operate, and the pressure is controlled by controlling the pneumatic angle valve through the solenoid valve. Instruction two is to divert the airflow through the diversion component to reduce the pressure.

[0064] The diversion assembly includes: a flow pipe 7 connected to the gas pipeline 5, a cylinder 8, a moving rod 9 connected to the cylinder 8, the cylinder 8 drives the moving rod 9 to move along the length direction of the moving rod 9, a wind shield 12 fixedly connected to the moving rod 9, a rotating plate 13 pivotally connected to the wind shield 12, the other end of the rotating plate 13 is pivotally connected to a support member 14, specifically, the support member 14 is an 'L'-shaped support rod, the lower end of the support member 14 is fixedly connected to the flow pipe 7, and the upper end of the support rod is pivotally connected to the rotating plate 13.

[0065] A windshield cloth is fixedly connected between the rotating plate 13 and the windshield plate 12. The windshield cloth is used to cover the gap between the rotating plate 13 and the windshield plate 12, so as to better guide the airflow. The windshield cloth is generally made of rubber material. The windshield cloth is fixedly connected to the rotating plate 13 and the windshield plate 12, and its elastic deformation and airtightness are used to block the wind.

[0066] It should be noted here that when the cylinder 8 drives the moving rod 9 to move, the wind shield plate 12 moves accordingly, and since both ends of the rotating plate 13 are movably connected, the angle of the rotating plate 13 changes.

[0067] The wind shield 12 is provided with a through hole 1, so that the wind shield 12 can relieve pressure.

[0068] Moreover, in actual applications, the airflow entering the adsorption tank 1 3 or the adsorption tank 2 4 is blown directly upward and directly toward the molecular sieve. The airflow has a strong directionality, resulting in a low utilization rate of the molecular sieve. The through hole 1 can reduce the pressure, and part of the airflow is blown toward the inner wall of the adsorption tank 1 3 or the adsorption tank 2 4 through the inclined rotating plate 13, thereby improving the utilization rate of the molecular sieve.

[0069] Since the effect of reducing pressure is limited, most of the air flows upward through the through hole 1, so that the airflow flowing to the inner wall of the adsorption tank 1 3 or the adsorption tank 2 4 is still limited, so that an air suction mechanism can be set near the inner wall of the adsorption tank 1 3 or the adsorption tank 2 4; the air is directed to the inner wall of the adsorption tank 1 3 or the adsorption tank 2 4, so that the gas flows from the center to the edge.

[0070] The air suction mechanism includes: a fixed plate 15, a movable plate 10 fixedly connected to the movable rod 9, a push rod 18 fixedly connected to the movable plate 10, a push plate 17 fixedly connected to the end of the push rod 18, the push plate 17 is in sliding contact with the inner wall of the cylinder 16, and the push plate 17 moves in the cylinder 16, the cylinder 16 is fixedly mounted on the fixed plate 15, and an air inlet pipe 19 and an air outlet pipe 20 are provided on the cylinder 16; the push plate 17 draws gas into the cylinder 16 through the air inlet pipe 19, and discharges it through the air outlet pipe 20; the air inlet pipe 19 is provided with two, and is located at both ends of the cylinder 16, and a check piece is provided between the air inlet pipe 19 and the cylinder 16; the air outlet pipe 20 is located in the middle of the cylinder 16, the fixed plate 15 is provided with an air vent one, and the movable plate 10 is provided with an air vent two.

[0071] It should be noted here that the adsorption tank 1 3 or the adsorption tank 2 4 is generally a cylindrical tower body. Therefore, for the convenience of description, the fixed plate 15 in the present application is circular, but a square shape is also acceptable; the cylinder 16 is arranged along the circumference of the fixed plate 15, especially arranged on the edge of the fixed plate 15.

[0072] Since no seal is provided between the push plate 17 and the inner wall of the cylinder 16, the air flow pressure discharged from the air outlet pipe 20 of the air suction mechanism is limited, thereby avoiding direct blowing to the molecular sieve; the check member can be a check valve, and of course other parts can also be selected, which will not be elaborated in this application.

[0073] It should be added that the air inlet end of the air inlet pipe 19 draws the gas into the cylinder 16 , so that the gas moves toward the edge of the adsorption tank 1 3 or the adsorption tank 2 4 .

[0074] When the suction mechanism is in operation, the cylinder 8 drives the moving plate 10 to move through the moving rod 9, so that the push plate 17 moves in the cylinder 16. When moving upward, the lower air intake pipe 19 takes in air and discharges it through the air outlet pipe 20; when moving downward, the upper air intake pipe 19 takes in air and discharges it through the air outlet pipe 20; thus, the present application can complete two intake and exhaust operations through the telescopic movement of a cylinder 8.

[0075] In order to enhance the effect of reducing pressure, the present application is provided with a secondary pressure reducing mechanism for reducing pressure for a second time, so that the gas in the adsorption tank 1 3 or the adsorption tank 2 4 can move better from the center to the edge.

[0076] The secondary decompression mechanism includes: a flow channel 21 fixedly installed on the fixed plate 15, the flow channel 21 connects the upper and lower parts of the fixed plate 15, a shielding member 22 is fixedly installed inside the flow channel 21, and a shielding member 23 is fixedly installed on the movable plate 10, and the shielding member 22 is adapted to the shielding member 23.

[0077] That is, the shielding member 22 is provided with a through hole 2, and the shielding member 23 is inserted into the through hole 2. It should be added here that the through hole 2 is different from the through hole 1. The aperture of the through hole 1 is smaller, and the aperture of the through hole 2 is larger. When the shielding member 23 is inserted into the through hole 2, most of the air flow will be blocked, so that the airflow in the center of the adsorption tank 1 3 or the adsorption tank 2 4 will be in a cut-off state, so that the gas will flow to the edge. When the shielding member 23 is not inserted into the through hole 2, the flow channel 21 will be in a flowing state; the airflow will intermittently flow to the edge, while minimizing the impact on the processing volume.

[0078] It should also be noted that the through hole 2 described in the present application may be provided with only one, that is, the shielding member 1 22 and the shielding member 2 23 may be intermittently opened and closed during use.

[0079] The cylinder 8 drives the moving rod 9 to move, so that the angle of the rotating plate 13 changes, the flow direction of the airflow is changed, and the air suction mechanism and the secondary decompression mechanism are linked; the airflow is equalized three times and decompressed twice to prevent the nitrogen purity from being insufficient due to pressure, or even damage to the molecular sieve.

[0080] In summary, when the value of the pneumatic angle valve controlled by the solenoid valve is less than the preset threshold, the controller sends this information to the cylinder 8, the cylinder 8 drives the moving rod 9 to move, the wind shield 12 performs a decompression, the rotating plate 13 performs a flow equalization, and then the suction mechanism performs a secondary flow equalization, and the secondary decompression mechanism performs a secondary decompression and a tertiary flow equalization; thus, frequent adjustment of the pneumatic angle valve can be avoided. On the one hand, the impact on the pretreatment mechanism 1 and the buffer tank 2 is reduced, making the airflow more stable; on the other hand, rapid adjustment can be performed, and the adjustment response is faster.

[0081] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0082] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A nitrogen purification device, characterized in that: include: Pre-treatment institutions; Buffer tank; and, purification institutions; The purification mechanism comprises: an adsorption tank 1, an adsorption tank 2, a flow dividing assembly arranged on the adsorption tank 1 and the adsorption tank 2, and a gas transmission pipeline connecting the adsorption tank 1, the adsorption tank 2 and the buffer tank; A pressure gauge is installed on the gas pipeline; The pressure gauge is electrically connected to a controller, which removes impurities from the acquired pressure information, generates adjustment information based on the removed data, and sends the adjustment information to the diversion component, which performs diversion.

2. The nitrogen purification device according to claim 1, characterized in that: The specific steps to generate reconciliation information are: Step S1: collecting pressure information of the pressure gauge; Step S2: Definition: u(t) is the adjustment information; Fm is the air pressure gain; Fd is the air pressure integral; Fc is the air pressure differential; Ha is the preset pressure; Hb is the pressure information of the pressure gauge; but: b(t) = Ha-Hb; According to the feedback adjustment algorithm, b(t) is substituted to obtain: u(t)=Fm*b(t)+Fd*∫b(t)dt+Fc*(b(t) / dt); Step S3: Input u(t) into the threshold comparison center. If u(t) is greater than the preset threshold, issue instruction one, otherwise issue instruction two.

3. The nitrogen purification device according to claim 2, characterized in that: The diversion assembly includes: a flow pipe connected to the gas transmission pipeline, a moving rod moving along its axial direction, a wind shield fixedly connected to the moving rod, a rotating plate pivotally connected to the wind shield, and the other end of the rotating plate is pivotally connected to the inner wall of adsorption tank one or adsorption tank two.

4. The nitrogen purification device according to claim 3, characterized in that: The end of the moving rod is fixedly connected to a moving plate, the moving plate is fixedly connected to a push rod, the end of the push rod is fixedly connected to a push plate, the push plate is in sliding contact with the inner wall of the cylinder, and the push plate moves in the cylinder, and the cylinder is provided with an air inlet pipe and an air outlet pipe; The push plate draws gas into the cylinder through the air inlet pipe and discharges the gas through the air outlet pipe.

5. The nitrogen purification device according to claim 4, characterized in that: The air inlet pipes are provided with two and are located at two ends of the cylinder, and a check piece is provided between the air inlet pipe and the cylinder.

6. The nitrogen purification device according to claim 4, characterized in that: The air outlet pipe is located in the middle of the cylinder.

7. The nitrogen purification device according to claim 4, characterized in that: The cylinder is fixedly mounted on a fixed plate, a flow channel is fixedly mounted on the fixed plate, a shielding member 1 is fixedly mounted inside the flow channel, a shielding member 2 is fixedly mounted on the movable plate, and the shielding member 1 is matched with the shielding member 2.

8. The nitrogen purification device according to claim 7, characterized in that: The first shielding member is provided with a second through hole, and the second shielding member is inserted into the second through hole.

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