Multistage purification and recovery equipment for chemical waste gas

Abstract

This utility model discloses a multi-stage purification and recovery device for chemical waste gas, relating to the field of chemical waste gas recovery technology. It includes a spray tower, with a connecting pipe fixedly connected to one side of the spray tower and communicating with its interior. A filter structure is installed at the end of the connecting pipe furthest from the spray tower. A drain port communicating with its interior is provided at the bottom of the spray tower. A guide pipe, coaxially aligned with the drain port, is fixedly connected to the bottom of the spray tower. A sliding plug is slidably connected inside the guide pipe, and a float is connected to the top of the sliding plug via a pull rope. In this multi-stage purification and recovery device for chemical waste gas, when the waste gas is sprayed from the top of the annular pipe, it needs to pass through a drug solvent layer to form a bubbling effect. The atomizing nozzles spaced at the bottom of each spray pipe generate a downward-spraying conical mist curtain, forming a counter-flow with the rising waste gas and the falling liquid, improving the mixing efficiency of the gas and drug spray. Simultaneously, the drug solvent layer is reused for pretreatment, improving the utilization efficiency of the drug solvent.

Description

Technical Field

[0001] This utility model relates to the field of chemical waste gas recovery technology, specifically a multi-stage purification and recovery device for chemical waste gas. Background Technology

[0002] Chemical waste gas refers to gases containing various harmful substances generated during chemical production processes. These harmful substances need to be treated before being emitted.

[0003] To achieve the above functions, a prior art Chinese patent (publication number: CN220715157U) discloses a chemical waste gas purification tower, including a purification tower body. The purification tower body includes a bag filter mechanism, which includes a dust collector bag and a stabilizing frame. The dust collector bag is fixedly connected to the lower end of the stabilizing frame and communicates with a smoke guide pipe. A tension spring is fixedly connected between the stabilizing frame and the smoke guide pipe. A through hole is opened in the middle of the inner wall of the purification tower body, and an alarm mechanism is installed in the through hole. The alarm mechanism includes an alarm element and a trigger element. During the waste gas purification process, the dust collector bag continuously adsorbs substances that are difficult to decompose and some oily substances in the waste gas. The resistance generated by the dust collector bag when filtering the waste gas continuously increases, causing the tension spring between the stabilizing frame and the smoke guide pipe to stretch. The stabilizing frame descends within the purification tower body, activating the trigger element to trigger the alarm element, reminding the operator to replace the dust collector bag in time to avoid damage to the dust collector bag due to decreased permeability, thus not affecting the efficiency of waste gas purification.

[0004] While existing technologies can overcome the shortcomings mentioned above, other problems still exist in their operation: chemical waste gas treatment usually uses spray towers, which achieve purification by mixing waste gas with chemical sprays. However, the mixing efficiency of gas and chemical sprays in existing spray towers is low, resulting in low chemical utilization and affecting the treatment effect. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage purification and recovery device for chemical waste gas, in order to solve the problem in the prior art that the mixing efficiency of gas and chemical spray in the existing spray tower is low, resulting in low chemical utilization and affecting the treatment effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage purification and recovery device for chemical waste gas, including a spray tower, wherein a connecting pipe communicating with the interior of the spray tower is fixedly connected to one side of the spray tower, and a filter structure is installed at the end of the connecting pipe away from the spray tower.

[0007] The bottom of the spray tower is provided with a drain port that communicates with its interior. The bottom of the spray tower is fixedly connected with a guide pipe that is coaxially aligned with the drain port. A sliding plug is slidably connected inside the guide pipe. A float is connected to the top of the sliding plug by a pull rope. The density of the float is less than the density of the liquid inside the spray tower, and the buoyancy provided by the float is greater than the weight of the sliding plug.

[0008] Preferably, an air inlet pipe is fixedly connected to the bottom of the spray tower, the upper end of the air inlet pipe extends into the interior of the spray tower and is connected to a radial diversion pipe, the end of the diversion pipe is connected to an annular pipe, and the top of the annular pipe is provided with nozzles evenly distributed along the circumferential direction.

[0009] Preferably, the top of the spray tower is provided with a liquid delivery pipe, which is connected to a radially distributed spray pipe, and the bottom of the spray pipe is provided with equidistant nozzles.

[0010] Preferably, the filter structure includes a filter tank connected to a connecting pipe, the filter tank has two sets of mounting rings on the left and right sides, and the top of the filter tank is an openable structure.

[0011] Preferably, the top of the filter tank is sealed by a sealing cap, and an installation ring corresponding to the installation ring inside the tank is fixedly connected to the inner side of the sealing cap. The installation ring and the installation ring inside the filter tank together form an installation cavity.

[0012] Preferably, a filter element is engaged between the two sets of mounting rings, and the sealing cover is fixedly connected to the filter tank by hand-tightening bolts passing through both sides.

[0013] Preferably, the outlet end of the filter tank is connected to an exhaust pipe, the exhaust pipe is equipped with a fan driven by a motor, and a chimney is vertically connected above the exhaust pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This is a multi-stage purification and recovery equipment for chemical waste gas. When the waste gas is sprayed out from the top of the annular pipe, it needs to pass through the drug solvent layer to form a bubbling effect. The atomizing nozzles at the bottom of each spray pipe will generate a downward-spraying cone-shaped mist curtain, which forms a counter-flow with the rising waste gas and the falling liquid medicine, improving the mixing efficiency of gas and drug spray. At the same time, the drug solvent layer is reused for pretreatment, improving the utilization efficiency of drug solvent.

[0016] The filter element is quickly positioned by snapping it into the mounting rings at both ends. The butterfly design of the hand-tightening bolts makes it easy to operate by hand. After loosening the bolts, the sealing cover can be lifted to replace the filter element, improving maintenance efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the spray tower of this utility model;

[0019] Figure 3 This is a schematic diagram of the guide tube structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the sliding plug structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the filter element structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the fan structure of this utility model.

[0023] In the diagram: 1. Spray tower; 2. Connecting pipe; 3. Drain outlet; 4. Guide pipe; 5. Sliding plug; 6. Pull rope; 7. Float; 8. Air inlet pipe; 9. Diverter pipe; 10. Ring pipe; 11. Infusion pipe; 12. Spray pipe; 13. Filter tank; 14. Mounting ring; 15. Filter element; 16. Sealing cap; 17. Hand-tightening bolt; 18. Exhaust pipe; 19. Fan; 20. Chimney. Detailed Implementation

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

[0025] Example 1: Please refer to Figures 1-4 This utility model provides the following technical solution: a multi-stage purification and recovery device for chemical waste gas, including a spray tower 1, a connecting pipe 2 fixedly connected to one side of the spray tower 1 and communicating with the interior of the spray tower 1, a filter structure installed at the end of the connecting pipe 2 away from the spray tower 1; a drain port 3 communicating with the interior of the spray tower 1 is provided at the bottom of the spray tower 1, a guide pipe 4 coaxially aligned with the drain port 3 is fixedly connected to the bottom of the spray tower 1, a sliding plug 5 is slidably connected inside the guide pipe 4, and a float 7 is connected to the top of the sliding plug 5 by a pull rope 6. The density of the float 7 is less than the density of the liquid inside the spray tower 1, and the buoyancy provided by the float 7 is greater than the weight of the sliding plug 5; the bottom of the spray tower 1 is fixedly connected to an air inlet pipe 8, the upper end of the air inlet pipe 8 extends into the interior of the spray tower 1 and is connected to a radial diversion pipe 9, the end of the diversion pipe 9 is connected to an annular pipe 10, and the top of the annular pipe 10 is provided with nozzles evenly distributed along the circumference; the top of the spray tower 1 is provided with a liquid delivery pipe 11, the liquid delivery pipe 11 is connected to a radially distributed spray pipe 12, and the bottom of the spray pipe 12 is provided with equally spaced nozzles.

[0026] When chemical waste gas enters through the inlet pipe 8, the gas is first evenly distributed to the annular pipe 10 through the radial diversion pipe 9. The annular airflow is formed through the densely distributed nozzles at the top, which effectively expands the gas-liquid contact area. The delivery pipe 11 delivers the drug solvent to the radially distributed spray pipe 12, which forms a downward mist liquid curtain through the equidistant nozzles at the bottom, forming a countercurrent contact with the rising airflow, and fully reacting with the soluble pollutants in the waste gas.

[0027] During the process of drug solvent spraying and waste gas reaction, drug solvent will accumulate inside the spray tower 1. When the accumulated drug solvent reaches the set liquid level, the float 7 floats up under the action of buoyancy. The sliding plug 5 is pulled up along the guide pipe 4 by the pull rope 6. At this time, the drain port 3 opens to discharge waste liquid. When the liquid level drops, the float 7 sinks down and the sliding plug 5 falls back down by its own weight to close the drain port 3, forming an automatic liquid level control cycle.

[0028] The liquid level inside the spray tower 1 is maintained at a certain height by a self-discharge structure formed by the float 7, the pull rope 6, and the sliding plug 5, and the annular pipe 10 is completely submerged in the liquid. Therefore, when the exhaust gas is discharged from the top of the annular pipe 10, the exhaust gas will first come into contact with the liquid inside the spray tower 1 for preliminary treatment. At this time, when the exhaust gas is sprayed from the top of the annular pipe 10, it needs to pass through the drug solvent layer to form a bubbling effect, thereby improving the utilization efficiency of the drug solvent. After the substances in the exhaust gas dissolve in the drug solvent, they are discharged through the drain port 3 for recycling.

[0029] Example 2: Based on Example 1, please refer to... Figure 5 and Figure 6 The filter structure is also disclosed, and its specific structure is as follows: The filter structure includes a filter tank 13 connected to the connecting pipe 2. The filter tank 13 is provided with two sets of left and right mounting rings 14. The top of the filter tank 13 is an openable structure. The top of the filter tank 13 is sealed by a sealing cover 16. The inner side of the sealing cover 16 is fixedly connected with a mounting ring 14 corresponding to the mounting ring 14 inside the tank. The mounting ring 14 and the mounting ring 14 inside the filter tank 13 together form a mounting cavity. A filter element 15 is engaged between the two sets of mounting rings 14. The sealing cover 16 is fixedly connected to the filter tank 13 by hand-tightening bolts 17 that pass through both sides. An exhaust pipe 18 is connected to the outlet end of the filter tank 13. A fan 19 driven by a motor is provided inside the exhaust pipe 18. A chimney 20 is vertically connected above the exhaust pipe 18.

[0030] The sprayed exhaust gas enters the filter tank 13 through the connecting pipe 2. Two sets of mounting rings 14 form symmetrical mounting cavities on the tank body and the sealing cover 16. The filter element 15 is quickly positioned by snapping its two ends onto the mounting rings 14. The butterfly design of the hand-tightening bolts 17 facilitates manual operation. After loosening the bolts, the sealing cover 16 can be lifted to replace the filter element, improving maintenance efficiency. As the exhaust gas flows inside the filter tank 13, the particulate matter inside will be intercepted by the filter element 15.

[0031] The fan 19 inside the exhaust pipe 18 is driven by a motor to generate negative pressure, which enhances the gas delivery power of the entire system. After being filtered through two stages, the exhaust gas is discharged into the air through the vertical chimney 20.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage purification and recovery device for chemical waste gas, comprising a spray tower (1), wherein a connecting pipe (2) communicating with the interior of the spray tower (1) is fixedly connected to one side of the spray tower (1), and a filter structure is installed at the end of the connecting pipe (2) away from the spray tower (1); Its features are: The bottom of the spray tower (1) is provided with a drain port (3) that communicates with its interior. The bottom of the spray tower (1) is fixedly connected with a guide pipe (4) that is coaxially aligned with the drain port (3). A sliding plug (5) is slidably connected inside the guide pipe (4). A float (7) is connected to the top of the sliding plug (5) by a pull rope (6). The density of the float (7) is less than the density of the liquid inside the spray tower (1), and the buoyancy provided by the float (7) is greater than the weight of the sliding plug (5).

2. The multi-stage purification and recovery equipment for chemical waste gas according to claim 1, characterized in that: The bottom of the spray tower (1) is fixedly connected to an air inlet pipe (8). The upper end of the air inlet pipe (8) extends into the interior of the spray tower (1) and is connected to a radial diversion pipe (9). The end of the diversion pipe (9) is connected to an annular pipe (10). The top of the annular pipe (10) is provided with nozzles that are evenly distributed along the circumference.

3. The multi-stage purification and recovery equipment for chemical waste gas according to claim 2, characterized in that: The top of the spray tower (1) is provided with a liquid delivery pipe (11), which is connected to a radially distributed spray pipe (12), and the bottom of the spray pipe (12) is provided with equidistant nozzles.

4. The multi-stage purification and recovery equipment for chemical waste gas according to claim 1, characterized in that: The filter structure includes a filter tank (13) connected to the connecting pipe (2), and the filter tank (13) is provided with two sets of mounting rings (14) on the left and right sides. The top of the filter tank (13) is an openable structure.

5. The multi-stage purification and recovery equipment for chemical waste gas according to claim 4, characterized in that: The top of the filter tank (13) is sealed by a sealing cover (16). The inner side of the sealing cover (16) is fixedly connected to an installation ring (14) corresponding to the installation ring (14) inside the tank. The installation ring (14) and the installation ring (14) inside the filter tank (13) together form an installation cavity.

6. The multi-stage purification and recovery equipment for chemical waste gas according to claim 5, characterized in that: A filter element (15) is engaged between the two sets of mounting rings (14), and the sealing cover (16) is fixedly connected to the filter tank (13) by hand-tightening bolts (17) that pass through both sides of it.

7. The multi-stage purification and recovery equipment for chemical waste gas according to claim 6, characterized in that: The outlet end of the filter tank (13) is connected to an exhaust pipe (18), and a fan (19) driven by a motor is installed inside the exhaust pipe (18). A chimney (20) is vertically connected above the exhaust pipe (18).

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