Phosphoric acid tail gas alkaline treatment assistor

Abstract

The utility model relates to the technical field of phosphoric acid production tail gas treatment, in particular to a phosphoric acid tail gas alkaline treatment assistor which comprises an absorption tower body, an exhaust pipe is fixedly installed at the top end of the absorption tower body, a connecting cover is fixedly installed at the bottom end of the exhaust pipe, and a flow speed adjusting frame is fixedly installed at the bottom end of the connecting cover. A treatment box is fixedly installed at the bottom end of the flow speed adjusting frame, a fiber demister is installed in the treatment box, a connecting pipe is fixedly installed at the bottom end of the treatment box, and a waste liquid collecting barrel is fixedly installed at the bottom end of the connecting pipe. By means of the design, the tail gas flow speed can be adjusted, it is avoided that the tail gas flow speed is too high, the interior of the treatment box is scoured, and secondary pollution is caused to captured liquid drops, and meanwhile normal work of the fiber demister can be guaranteed; the service life is prolonged, the maintenance frequency is effectively reduced, and the maintenance cost is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of phosphoric acid production tail gas treatment technology, specifically to an alkaline treatment auxiliary device for phosphoric acid tail gas. Background Technology

[0002] The commonly used alkaline treatment of phosphoric acid tail gas is the total heat recovery thermal process. The main process involves burning yellow phosphorus in a combustion furnace, recovering the heat generated by combustion to produce steam for external heating, and forming phosphorus pentoxide gas from the burning yellow phosphorus. The gas then enters the next process absorption tower. Water mist is sprayed into the upper, middle and lower layers of the absorption tower. When phosphorus pentoxide comes into contact with water, it forms phosphoric acid. The treatment of phosphoric acid production tail gas through the absorption tower is a typical alkaline treatment process.

[0003] According to the search, CN215939507U discloses a phosphoric acid production tail gas treatment device, which includes an absorption tower, a tail gas pipeline, a tail gas treatment device, a fiber demister, and a plastic container bottle. The absorption tower is connected to the tail gas pipeline on one side, and a tail gas treatment device with waste liquid recovery function is installed at one end of the tail gas pipeline. A fiber demister is installed inside the tail gas treatment device, and a plastic container bottle is installed at the lower end of the tail gas treatment device.

[0004] When the fiber demister continuously filters the exhaust gas, the waste liquid gradually increases. The waste liquid flows from the fiber demister onto the guide shroud, then through the internal through-hole of the guide shroud into the pipe body, and finally into the plastic container bottle through the receiving seat, thus recycling the waste liquid. At the same time, the plastic container bottle is connected to the receiving seat by screws, which facilitates the replacement of the plastic container bottle by the staff. However, in actual operation, the absorption tower is directly connected to the exhaust gas treatment device through the exhaust gas pipeline. Since the exhaust gas flow rate cannot be controlled, when the exhaust gas is directly introduced into the exhaust gas treatment device, the collection efficiency of the fiber demister has a non-linear relationship with the gas flow rate. When the flow rate exceeds the critical value (usually 3-5 m / s), the droplet penetration rate increases significantly. If the exhaust gas flow rate is too fast, it will wash away the inside of the device, causing secondary pollution from the captured droplets. At the same time, it will also reduce the service life of the fiber demister and further increase the maintenance cost.

[0005] Therefore, it is of great importance to design an alkaline treatment auxiliary device for phosphoric acid tail gas to solve the above-mentioned defects. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model designs an alkaline treatment auxiliary device for phosphoric acid tail gas. This auxiliary device aims to solve the technical problems that existing phosphoric acid production tail gas treatment devices cannot control the tail gas flow rate. If the flow rate is too high, it will wash away the inside of the device, causing secondary pollution from the captured droplets. At the same time, it will also reduce the service life of the fiber demister and further increase the maintenance cost.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An alkaline treatment auxiliary device for phosphoric acid tail gas includes an absorption tower body, an exhaust pipe fixedly installed at the top of the absorption tower body, a connecting cover fixedly installed at the bottom of the exhaust pipe, a flow rate regulating frame fixedly installed at the bottom of the connecting cover, a treatment box fixedly installed at the bottom of the flow rate regulating frame, a fiber demister installed inside the treatment box, a connecting pipe fixedly installed at the bottom of the treatment box, and a waste liquid collection cylinder fixedly installed at the bottom of the connecting pipe.

[0009] Multiple sets of adjustment plates are rotatably connected at equal intervals on the inner side of the flow rate adjustment frame. A transmission arm is fixedly installed on the left end of each set of adjustment plates. The multiple sets of transmission arms are connected to each other through a synchronization plate. The outer side of the synchronization plate is rotatably connected to the transmission arm through a connecting column. An adjustment motor is fixedly installed on the outer side of the flow rate adjustment frame. The drive end of the adjustment motor is fixedly connected to one of the sets of transmission arms.

[0010] As a preferred embodiment of this utility model, rubber pads are fixedly connected to both the upper and lower sides of the flow rate adjustment frame, and the upper and lower sides of the flow rate adjustment frame are fixedly connected to the connecting cover and the processing box respectively by multiple sets of screws. An airflow velocity sensor is installed at the connection between the connecting cover and the exhaust pipe.

[0011] As a preferred embodiment of this utility model, a flow guide shroud is fixedly installed at the top of the inside of the processing box, the top of the fiber demister abuts against the bottom of the flow guide shroud, and a rubber sealing ring is sleeved at the connection between the flow guide shroud and the fiber demister. Connecting cylinders are fixedly installed at both the left and right ends inside the processing box, and movable columns are slidably connected inside both sets of connecting cylinders. A first spring is movably installed at one end of the movable column inside the connecting cylinder, and a positioning plate is fixedly installed at the top of the movable column and at the bottom of the fiber demister.

[0012] As a preferred embodiment of this utility model, an inspection door is installed on the outside of the processing box, and a solenoid valve is installed at the connection between the connecting pipe and the processing box.

[0013] As a preferred embodiment of this utility model, the bottom end of the connecting pipe is fixedly connected to a connector, and a docking groove is provided at the top of the waste liquid collection cylinder at a position corresponding to the connector. A rubber inner sealing gasket is fixedly connected to the inner side of the docking groove. The top end of the waste liquid collection cylinder is fixedly connected to the connector through two sets of quick-release boxes, and a liquid level window is installed on the outer side of the waste liquid collection cylinder.

[0014] As a preferred embodiment of this utility model, the quick-release box has a locking post slidably connected inside, and a sleeve is fixedly connected to the outer side of the connector at a position corresponding to the locking post. A second spring is sleeved on the outer side of the locking post, and a top ring is fixedly connected to the outer side of the locking post and at the end of the second spring near the sleeve.

[0015] As a preferred embodiment of this utility model, a locking post is fixedly connected to the outer side of the top ring, and a locking groove is provided on the outer side of the quick-release box at a position corresponding to the locking post.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] In this invention, through the coordinated design of the connecting cover and the flow rate regulating frame, the exhaust gas of the absorption tower body is discharged through the exhaust pipe. The exhaust gas velocity is monitored by the airflow velocity sensor. During this process, the regulating motor is started to drive one set of transmission arms to rotate. The transmission arms can drive the synchronous plate to swing laterally. The synchronous plate drives multiple sets of transmission arms to rotate together, thereby rotating and adjusting the regulating plate inside the flow rate regulating frame. This adjusts the exhaust gas velocity, preventing the exhaust gas velocity from being too fast and washing over the inside of the treatment box, causing secondary pollution to the captured droplets. At the same time, it ensures the normal operation of the fiber demister, improves its service life, effectively reduces the number of maintenance times, and further reduces maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the flow rate regulating frame structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the processing box of this utility model;

[0021] Figure 4 This is a schematic diagram of the waste liquid collection cylinder structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the quick-release box structure of this utility model.

[0023] In the diagram: 1. Absorption tower body; 2. Exhaust pipe; 3. Connecting cover; 301. Airflow velocity sensor; 4. Flow rate adjustment frame; 401. Adjusting plate; 402. Transmission arm; 403. Synchronization plate; 404. Connecting column; 405. Adjusting motor; 406. Rubber pad; 5. Processing box; 501. Flow guide cover; 502. Rubber sealing ring; 503. Connecting cylinder; 504. Movable column; 505. First spring; 506. Positioning plate; 507. Inspection door; 508. Solenoid valve; 6. Fiber demister; 7. Connecting pipe; 701. Butt joint; 702. Docking groove; 703. Rubber inner sealing gasket; 704. Quick release box; 705. Liquid level window; 706. Locking column; 707. Sleeve; 708. Second spring; 709. Top ring; 710. Locking column; 711. Locking groove; 8. Waste liquid collection cylinder. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Example: Please refer to Figures 1-5 This utility model provides a technical solution:

[0026] An alkaline treatment auxiliary device for phosphoric acid tail gas includes an absorption tower body 1, an exhaust pipe 2 fixedly installed at the top of the absorption tower body 1, a connecting cover 3 fixedly installed at the bottom of the exhaust pipe 2, a flow rate regulating frame 4 fixedly installed at the bottom of the connecting cover 3, a treatment box 5 fixedly installed at the bottom of the flow rate regulating frame 4, a fiber demister 6 installed inside the treatment box 5, a connecting pipe 7 fixedly installed at the bottom of the treatment box 5, and a waste liquid collection cylinder 8 fixedly installed at the bottom of the connecting pipe 7.

[0027] First, in this embodiment, the specific structure of the flow rate adjustment box 4 is as follows:

[0028] Multiple sets of regulating plates 401 are rotatably connected at equal intervals on the inner side of the flow rate regulating frame 4. A transmission arm 402 is fixedly installed on the left end of each set of regulating plates 401. The multiple sets of transmission arms 402 are connected by a synchronization plate 403, and the outer side of the synchronization plate 403 is rotatably connected to the transmission arm 402 via a connecting column 404. A regulating motor 405 is fixedly installed on the outer side of the flow rate regulating frame 4, and the drive end of the regulating motor 405 is fixedly connected to one set of transmission arms 402. The exhaust gas from the absorption tower body 1 is discharged through the exhaust pipe 2. During this process, the regulating motor 402 is activated. 05 drives one set of transmission arms 402 to rotate. The transmission arms 402 can drive the synchronous plate 403 to swing laterally. The synchronous plate 403 drives multiple sets of transmission arms 402 to rotate together, thereby rotating and adjusting the adjustment plate 401 inside the flow rate adjustment frame 4. This can adjust the exhaust gas velocity, preventing the exhaust gas velocity from being too fast and washing over the inside of the treatment box 5, causing secondary pollution to the captured droplets. At the same time, it can ensure the normal operation of the fiber demister 6, improve its service life, effectively reduce the number of maintenance times, and further reduce maintenance costs.

[0029] Furthermore, rubber pads 406 are fixedly connected to both the upper and lower sides of the flow rate adjustment frame 4. Both the upper and lower sides of the flow rate adjustment frame 4 are fixedly connected to the connecting cover 3 and the treatment box 5 respectively by multiple sets of screws. An airflow velocity sensor 301 is installed at the connection between the connecting cover 3 and the exhaust pipe 2. The flow rate adjustment frame 4 is installed between the connecting cover 3 and the treatment box 5 by screws. The rubber pads 406 ensure the sealing after installation. When the exhaust gas is discharged, the airflow velocity sensor 301 monitors the exhaust gas velocity, so that the exhaust gas velocity can be adjusted in time to ensure the normal operation of the fiber demister 6.

[0030] Then, a flow guide shroud 501 is fixedly installed at the top of the inside of the treatment box 5. The top of the fiber demister 6 abuts against the bottom of the flow guide shroud 501, and a rubber sealing ring 502 is fitted at the connection between the flow guide shroud 501 and the fiber demister 6. Connecting cylinders 503 are fixedly installed at both the left and right ends inside the treatment box 5. Movable columns 504 are slidably connected inside both sets of connecting cylinders 503. A first spring 505 is movably installed at one end of the movable column 504 inside the connecting cylinder 503. The top of the movable column 504 and the bottom of the fiber demister 6 are fixedly installed. A positioning plate 506 is fixedly installed. The top of the fiber demister 6 abuts against the guide shroud 501 and is sealed by the outer rubber sealing ring 502. At the same time, the first spring 505 inside the connecting cylinder 503 pushes the movable column 504 upward. The positioning plate 506 is used to install and fix the fiber demister 6 inside the treatment box 5. When the exhaust gas enters the treatment box 5, it is guided into the fiber demister 6 through the guide shroud 501 for treatment. The treated waste liquid is discharged from the connecting pipe 7 at the bottom of the treatment box 5 and finally collected through the waste liquid collection cylinder 8.

[0031] Furthermore, an inspection door 507 is installed on the outside of the treatment box 5, and a solenoid valve 508 is installed at the connection between the connecting pipe 7 and the treatment box 5. When replacing or maintaining the fiber demister 6, the inspection door 507 is opened and the fiber demister 6 is moved downward so that its top end is removed from inside the rubber sealing ring 502. Then it can be released and removed from inside the treatment box 5, which further improves the convenience of inspection and maintenance. At the same time, when processing with the waste liquid collection cylinder 8 inside the treatment box 5, the solenoid valve 508 is activated to close the connecting pipe 7.

[0032] The bottom end of the connecting pipe 7 is fixedly connected to a connector 701. The top end of the waste liquid collection cylinder 8 is provided with a docking groove 702 corresponding to the connector 701. A rubber inner sealing gasket 703 is fixedly connected to the inner side of the docking groove 702. The top end of the waste liquid collection cylinder 8 is fixedly connected to the connector 701 through two sets of quick-release boxes 704. A liquid level window 705 is installed on the outer side of the waste liquid collection cylinder 8. The connector 701 at the bottom end of the connecting pipe 7 is inserted into the docking groove 702 and fixed by the quick-release box 704, thereby installing the waste liquid collection cylinder 8 at the bottom end of the connecting pipe 7 to collect waste liquid. At the same time, the rubber inner sealing gasket 703 can ensure the sealing of the connection.

[0033] Secondly, a locking pin 706 is slidably connected inside the quick-release box 704. A sleeve 707 is fixedly connected to the outer side of the connector 701 at a position corresponding to the locking pin 706. A second spring 708 is sleeved on the outer side of the locking pin 706. A top ring 709 is fixedly connected to the outer side of the locking pin 706 and at the end of the second spring 708 near the sleeve 707. The second spring 708 abuts against the top ring 709, causing the locking pin 706 to be inserted into the sleeve 707, thereby installing and fixing the waste liquid collection cylinder 8 at the bottom end of the connecting pipe 7 to collect waste liquid.

[0034] Finally, a locking post 710 is fixedly connected to the outer side of the top ring 709. A slot 711 is provided on the outer side of the quick-release box 704 at the position corresponding to the locking post 710. After observing that the waste liquid is full through the liquid level window 705 on the outer side of the waste liquid collection cylinder 8, first close the connecting pipe 7, then pull the locking post 706 and rotate it to insert the locking post 710 into the slot 711, which can quickly release the fixing of the connector 701, thereby facilitating the disassembly and assembly of the waste liquid collection cylinder 8 and the treatment of the internal waste liquid.

[0035] In this embodiment, the specific implementation scenario is as follows: the exhaust gas from the absorption tower body 1 is discharged through the exhaust pipe 2. The exhaust gas velocity is monitored by the airflow velocity sensor 301. During this process, the regulating motor 405 is started to drive one set of transmission arms 402 to rotate. The transmission arms 402 can drive the synchronous plate 403 to swing laterally. The synchronous plate 403 drives multiple sets of transmission arms 402 to rotate together, thereby adjusting the rotation of the regulating plate 401 inside the velocity regulating frame 4, and thus adjusting the exhaust gas velocity. When the exhaust gas enters the interior of the treatment box 5, it is guided into the fiber demister 6 through the guide hood 501 for treatment. The treated waste liquid is discharged from the connecting pipe 7 at the bottom of the treatment box 5 and finally collected through the waste liquid collection cylinder 8. The entire operation process is simple and convenient. This utility model can adjust the exhaust gas velocity through design, avoiding the exhaust gas velocity being too fast and washing the interior of the treatment box 5, causing secondary pollution to the captured droplets. At the same time, it can ensure the normal operation of the fiber demister 6, improve its service life, effectively reduce the number of maintenance times, and further reduce maintenance costs.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A phosphoric acid tail gas alkaline treatment assistant comprising an absorption column body (1), characterized in that: The top end of the absorption tower body (1) is fixedly installed with an exhaust pipe (2), the bottom end of the exhaust pipe (2) is fixedly installed with a connecting cover (3), the bottom end of the connecting cover (3) is fixedly installed with a flow rate adjusting frame (4), the bottom end of the flow rate adjusting frame (4) is fixedly installed with a treatment box (5), the inside of the treatment box (5) is installed with a fiber demister (6), the bottom end of the treatment box (5) is fixedly installed with a connecting pipe (7), and the bottom end of the connecting pipe (7) is fixedly installed with a waste liquid collecting cylinder (8). The inner side of the flow rate adjusting frame (4) is rotationally connected with a plurality of groups of adjusting plates (401) at equal intervals, the left end of each group of the adjusting plates (401) is fixedly installed with a transmission arm (402), a plurality of groups of the transmission arms (402) are connected through a synchronous plate (403), the outer side of the synchronous plate (403) is rotationally connected with the transmission arm (402) through a connecting column (404), the outer side of the flow rate adjusting frame (4) is fixedly installed with an adjusting motor (405), and the driving end of the adjusting motor (405) is fixedly connected with one group of the transmission arms (402).

2. The phosphoric acid tail gas alkaline treatment assistant according to claim 1, characterized in that: The upper and lower sides of the flow rate adjusting frame (4) are fixedly connected with rubber pads (406), and the upper and lower sides of the flow rate adjusting frame (4) are fixedly connected with the connecting cover (3) and the treatment box (5) through a plurality of groups of screws, respectively, and an airflow flow rate sensor (301) is installed at the connecting position of the connecting cover (3) and the exhaust pipe (2).

3. The phosphoric acid tail gas alkaline treatment assistant according to claim 1, characterized in that: The top end of the inside of the treatment box (5) is fixedly installed with a flow guide cover (501), the top end of the fiber demister (6) abuts against the bottom end of the flow guide cover (501), a rubber sealing ring (502) is sleeved at the connecting position of the flow guide cover (501) and the fiber demister (6), the left and right ends of the inside of the treatment box (5) are fixedly installed with connecting cylinders (503), the inside of each of the two groups of the connecting cylinders (503) is slidingly connected with a movable column (504), a first spring (505) is movably installed at one end of the movable column (504) in the connecting cylinder (503), and a positioning plate (506) is fixedly installed at the top end of the movable column (504) and located at the bottom of the fiber demister (6).

4. The phosphoric acid tail gas alkaline treatment assistant according to claim 1, characterized in that: A maintenance door (507) is installed at the outer side of the treatment box (5), and an electromagnetic valve (508) is installed at the connecting position of the connecting pipe (7) and the treatment box (5).

5. The phosphoric acid tail gas alkaline treatment assistant according to claim 1, characterized in that: The bottom end of the connecting pipe (7) is fixedly connected with a butt joint (701), a butt groove (702) is formed at the position corresponding to the butt joint (701) at the top end of the waste liquid collecting cylinder (8), a rubber inner sealing pad (703) is fixedly connected to the inner side of the butt groove (702), the top end of the waste liquid collecting cylinder (8) is fixedly connected with the butt joint (701) through two groups of quick release boxes (704), and a liquid level window (705) is installed at the outer side of the waste liquid collecting cylinder (8).

6. The phosphoric acid tail gas alkaline treatment assistant according to claim 5, characterized in that: The inside of the quick release box (704) is slidably connected with a locking column (706), the outside of the butt joint (701) is fixedly connected with a sleeve (707) at a position corresponding to the locking column (706), the outside of the locking column (706) is sleeved with a second spring (708), and the outside of the locking column (706) and located at one end of the second spring (708) close to the sleeve (707) is fixedly connected with a top ring (709).

7. The phosphoric acid tail gas alkaline treatment assistant according to claim 6, characterized in that: The outside of the top ring (709) is fixedly connected with a clamping column (710), and the outside of the quick release box (704) is provided with a clamping groove (711) at a position corresponding to the clamping column (710).

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