A VOCs removal and purification system

Abstract

This application relates to the technical field of waste gas treatment, and specifically discloses a VOCs removal and purification system, including a reaction tower, a packing unit, and a grid assembly. The reaction tower has an inlet smoke box and an outlet smoke box, which are respectively located on opposite sides of the reaction tower. Specifically, the inlet smoke box is located on the left side of the reaction tower, and the outlet smoke box is located on the right side of the reaction tower, forming a transversely flowing waste gas channel. The packing unit is vertically filled inside the reaction tower, and is vertically arranged between the inlet and outlet smoke boxes. The packing unit is filled with adsorbent for adsorbing VOCs components in the waste gas. An air passage is provided between adjacent packing units, allowing gas to pass along a predetermined path. Specifically, the air passage is a vertical channel communicating with the inlet and outlet smoke boxes, guiding the waste gas from the inlet smoke box, through the air passage, and then into the packing unit. This application has the effect of improving gas-solid contact efficiency and thus improving purification efficiency.

Description

Technical Field

[0001] This application relates to the technical field of waste gas treatment, and in particular to a VOCs removal and purification system. Background Technology

[0002] Volatile organic compounds (VOCs) are organic compounds that have a high saturated vapor pressure (greater than 13.33 Pa), low boiling point, small molecular weight, and are easily volatilized at room temperature under standard conditions. These substances are one of the main air pollutants and are commonly represented by VOCs. VOCs are generally classified into several categories, including non-methane hydrocarbons (NMHCs), oxygenated organic compounds, halogenated hydrocarbons, nitrogen-containing organic compounds, and sulfur-containing organic compounds. VOCs participate in the formation of ozone and secondary aerosols in the atmosphere, significantly impacting regional ozone pollution and PM2.5 pollution. Most VOCs have unpleasant odors and are toxic, irritating, teratogenic, and carcinogenic, especially benzene, toluene, and formaldehyde, which can cause significant harm to human health. VOCs are important precursors to urban haze and photochemical smog, primarily originating from coal chemical, petrochemical, fuel and coating manufacturing, and solvent manufacturing and use processes.

[0003] Currently, common technologies for VOCs treatment include adsorption, absorption, and combustion. For purification systems employing fixed-bed adsorption or catalytic reactions, ensuring sufficient and uniform contact between the waste gas and the packing material (such as adsorbents or catalysts) while simultaneously reducing system resistance has been a persistent challenge for those skilled in the art. Existing packed towers typically use randomly stacked or monolithically arranged packing materials, resulting in uneven gas flow paths and a tendency for channeling and wall flow phenomena. This leads to some packing material not being fully utilized, impacting purification efficiency. Summary of the Invention

[0004] To address the problem of low purification efficiency in existing packed towers, this application provides a VOCs removal and purification system.

[0005] On the one hand, the VOCs removal and purification system provided in this application adopts the following technical solution: A VOCs removal and purification system, comprising: The reaction tower has an inlet smoke box and an outlet smoke box, which are respectively located on opposite sides of the reaction tower; The packing unit is vertically filled in the reaction tower. The packing unit is vertically arranged between the inlet smoke box and the outlet smoke box. The packing unit is filled with adsorbent. There are multiple sets of packing units. Each set of packing units is spaced apart. There is a gas passage between adjacent packing units. The gas passage is located between the inlet smoke box and the outlet smoke box and is perpendicular to the inlet smoke box and the outlet smoke box. The gas passage is used to allow gas to pass through along a preset path. The grid assembly consists of multiple sets spaced apart within the reaction tower. The grid assembly is positioned between the packing unit and the gas passage to support the packing unit.

[0006] By adopting the above technical solution, after the exhaust gas enters the reaction tower from the inlet flue, it flows through the gas duct and passes through the grid assembly into the packing unit, where it fully contacts the adsorbent and undergoes a VOCs removal reaction. Because the packing units are vertically arranged and spaced apart, the gas duct forms a guiding structure, resulting in a more orderly gas flow path and avoiding the channeling and wall flow phenomena commonly found in traditional packed towers. The grid assembly supports the packing and ensures uniform gas distribution, further improving the gas-solid contact efficiency.

[0007] In some embodiments, a frame is provided inside the reaction tower, and the grid assembly includes multiple mounting plates and grid plates. The mounting plates are installed on the frame at intervals, and multiple grid plates are arranged at intervals between adjacent mounting plates. The bottom of the grid plates is inclined towards the packing unit, and the orthographic projections of adjacent grid plates in the horizontal direction overlap.

[0008] In some embodiments, the air duct includes multiple inlet air ducts and multiple outlet air ducts, which are respectively arranged on both sides of the packing unit. A first baffle is provided at the end of the outlet air duct near the inlet smoke box, and second baffles are provided at both ends of the packing unit. A third baffle is provided at the end of the inlet air duct near the outlet smoke box.

[0009] In some embodiments, a feed inlet is provided at the top of the packing unit, and a discharge hopper is provided at the bottom of the packing unit. A discharge valve is provided on the discharge hopper, and the discharge valve is used to control the opening and closing of the discharge hopper.

[0010] In some embodiments, each packing unit includes multiple packing cells, the multiple packing cells forming a first packing group along the horizontal direction, the multiple packing cells forming a second packing group along the vertical direction, and multiple first packing groups and multiple second packing groups are provided, with the first packing groups and the second packing groups being interconnected.

[0011] In some embodiments, a baffle assembly is provided within the packing unit. The baffle assembly is spaced apart within the packing cells of the first packing group. The baffle assembly includes a drive source and a baffle. The baffle is rotatably mounted on the frame. The drive source is connected to the baffle in a transmission manner. The drive source is used to drive the baffle to change between a first state and a second state.

[0012] In some embodiments, a rotating shaft is rotatably connected to the frame, a baffle is fixedly installed on the rotating shaft and can rotate with the rotating shaft, a transmission wheel is provided at one end of the rotating shaft, a transmission rod is provided on the frame, the transmission rod is arranged perpendicular to the rotating shaft, a drive wheel is provided on the transmission rod, and the drive wheel is connected to the transmission wheel in a transmission connection.

[0013] In some embodiments, the inlet and / or outlet fume boxes are provided with gas analyzer interfaces and / or temperature sensor interfaces and / or pressure sensor interfaces.

[0014] In some embodiments, a first slot and a second slot are provided on the side of the baffle away from the pivot. The first slot is used for the frame to be inserted in a first state, and the second slot is used for the frame to be inserted in a second state.

[0015] On the other hand, this application provides a VOCs removal and purification method, applied to any of the above VOCs removal and purification systems, comprising the following steps: The waste gas containing VOCs is introduced into the reaction tower from the inlet flue box; The exhaust gas first flows through the gas duct in the reaction tower, then passes through the grid assembly and enters the packing unit, where it comes into contact with the packing material to carry out a VOCs removal reaction. The purified gas after VOCs removal flows out from the other side of the packing unit, and is then collected through the air duct on the other side before being discharged from the exhaust chamber.

[0016] Compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. By setting up multiple sets of spaced packing units and air channels, the gas is guided to flow along a preset path, avoiding problems such as gas short-circuiting and channeling in traditional packed towers, improving gas-solid contact efficiency. The baffle plate further controls the airflow direction, ensuring that the gas flows fully through the packing layer and improving purification efficiency. The partitioned structure and inclined grid plate design of the grid assembly not only support the packing material but also optimize airflow distribution and prevent packing material leakage. 3. The packing unit is divided into multiple packing compartments, which facilitates zone control and packing management. The baffle assembly can realize the on / off control of the packing compartments, improving the system's operational flexibility. Attached Figure Description

[0017] Figure 1 This is a front view of the reaction tower in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the internal structure of the reaction tower in an embodiment of this application.

[0019] Figure 3 This is a top view of the reaction tower in an embodiment of this application.

[0020] Figure 4 This is a schematic diagram showing the positional relationship between the grille assembly and the frame in an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the baffle in an embodiment of this application.

[0022] Figure 6 This is a schematic diagram of the baffle assembly in an embodiment of this application.

[0023] In the picture: 1. Reaction tower; 11. Inlet smoke box; 12. Outlet smoke box; 13. Frame; 2. Packing unit; 21. Feed inlet; 22. Discharge hopper; 24. First packing group; 25. Second packing group; 3. Air duct; 31. Inlet air duct; 32. Outlet air duct; 4. Grille assembly; 41. Mounting plate; 42. Grille plate; 5. First baffle; 6. Second baffle; 7. Third baffle; 8. Baffle assembly; 82. Baffle; 83. Rotating shaft; 84. First slot; 85. Second slot. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Reference Figures 1 to 3 This application provides a VOCs removal and purification system, including a reaction tower 1, a packing unit 2, and a grid assembly 4. The reaction tower 1 has an inlet smoke box 11 and an outlet smoke box 12, which are respectively arranged on opposite sides of the reaction tower 1. Figure 1An inlet fume box 11 is located on the left side of the reaction tower 1, and an outlet fume box 12 is located on the right side of the reaction tower 1, forming a transversely flowing exhaust gas channel. Packing units 2 are vertically packed inside the reaction tower 1, positioned between the inlet fume box 11 and the outlet fume box 12. Each packing unit 2 is filled with an adsorbent to adsorb VOCs components in the exhaust gas. The adsorbent can be a carbonaceous adsorbent, such as activated carbon or biochar, or an inorganic adsorbent, such as zeolite or activated alumina; no specific limitation is made here. Multiple sets of packing units 2 are provided, with each set spaced apart. An air passage 3 is provided between adjacent packing units 2, allowing gas to pass along a predetermined path. The air passage 3 is a vertical channel, communicating with both the inlet fume box 11 and the outlet fume box 12. After entering from the inlet fume box 11, the exhaust gas first flows through the air passage 3, then enters the packing unit 2, and finally exits from the outlet fume box 12.

[0027] Multiple sets of grid assemblies 4 are arranged at intervals within the reaction tower 1, positioned between the packing unit 2 and the gas duct 3. In this embodiment, multiple sets of grid assemblies 4 are provided on both sides of each packing unit 2 to support the adsorbent within the packing unit 2 and to uniformly distribute the gas entering the packing unit 2. Through this structure, after the exhaust gas enters the reaction tower 1 from the inlet flue 11, it flows through the gas duct 3 and passes through the grid assemblies 4 into the packing unit 2, where it comes into full contact with the adsorbent for VOCs adsorption and removal. Because the packing units 2 are vertically arranged and spaced apart, the gas duct 3 forms a flow guiding structure, resulting in a more orderly gas flow path and avoiding the channeling and wall flow phenomena commonly found in traditional packed towers. The grid assemblies 4 support the packing and uniformly distribute the gas, further improving the gas-solid contact efficiency.

[0028] Reference Figure 4 Furthermore, a frame 13 is provided inside the reaction tower 1, and the grid assembly 4 includes multiple mounting plates 41 and grid plates 42. The mounting plates 41 are spaced apart on the frame 13, and multiple grid plates 42 are spaced apart between adjacent mounting plates 41 to form gaps for gas flow. The bottom of the grid plates 42 is inclined towards the packing unit 2, and the horizontal projections of adjacent grid plates 42 overlap. Through this structure, the inclined arrangement and overlapping projections of the grid plates 42 can effectively prevent packing particles from falling from the grid gaps. At the same time, the inclined structure guides the gas flow direction, allowing the gas to enter the packing layer more evenly, further optimizing the airflow distribution.

[0029] Reference Figure 5In some embodiments, a baffle structure is further provided. The air duct 3 includes multiple inlet air ducts 31 and multiple outlet air ducts 32, which are respectively arranged on both sides of the packing unit 2. A first baffle 5 is provided at the end of the outlet air duct 32 near the inlet smoke box 11, and second baffles 6 are provided at both ends of the packing unit 2. A third baffle 7 is provided at the end of the inlet air duct 31 near the outlet smoke box 12. By setting the first baffle 5, the second baffle 6, and the third baffle 7, the gas entering from the inlet smoke box 11 can be guided into the air duct 3 along a preset path (as shown in the arrow direction in the figure); the second baffle 6 can prevent the gas from flowing directly from the packing unit 2 to the outlet smoke box 12; and the third baffle 7 can prevent the gas from directly short-circuiting from the inlet air duct 31 to the outlet smoke box 12. With this baffle configuration, the inlet air passage 31 and the outlet air passage 32 become the only channels connecting the inlet smoke box 11 and the outlet smoke box 12, ensuring that the gas must flow through the packing unit 2. The baffle configuration can effectively control the gas flow direction, prevent gas short circuits, and ensure that the gas flows through the air passage 3 and the packing unit 2 in sequence according to the preset path, thereby improving the utilization rate and removal efficiency of the packing.

[0030] Reference Figure 1 and Figure 2 Specifically, the top of the packing unit 2 is provided with a feed inlet 21 for replenishing fresh adsorbent into the packing unit 2. The bottom of the packing unit 2 is provided with a discharge hopper 22, which is equipped with a discharge valve to control the opening and closing of the discharge hopper 22. When the adsorbent needs to be replaced or regenerated, the discharge valve is opened, the adsorbent is discharged from the discharge hopper 22, and then fresh adsorbent is replenished through the feed inlet 21. This structure facilitates the replenishment and replacement of the packing material, improving the system's maintenance convenience and operational continuity.

[0031] Each packing unit 2 includes multiple packing cells. Multiple packing cells arranged horizontally form a first packing group 24, and multiple packing cells arranged vertically form a second packing group 25. Multiple first packing groups 24 and multiple second packing groups 25 are provided, and the first and second packing groups 24 and 25 are interconnected. Each packing cell is interconnected, allowing free gas flow. The packing unit 2 is divided into multiple independent packing cells, facilitating the segmented filling of different types of packing materials or achieving zoned control, thus improving the system's flexibility and adaptability. For example, different types of adsorbents can be filled in different packing cells to adapt to the treatment of VOCs waste gas with complex components.

[0032] A baffle assembly 8 is provided within the packing unit 2, and the baffle assemblies 8 are spaced apart within the packing cells of the first packing group 24. The baffle assembly 8 includes a drive source and a baffle 82. The baffle 82 is rotatably mounted on the frame 13, and the drive source is drively connected to the baffle 82. The drive source is used to drive the baffle 82 to change between a first state and a second state. The first state is a horizontal state for the baffle 82, and the second state is a vertical state for the baffle 82. Before packing is installed, the position of the baffle 82 can be adjusted by the drive source to control its state, thereby enabling subsequent control of the gas flow path. The baffle assembly 8 can realize the on / off control of the packing cells, facilitating zone switching or online regeneration, and enhancing the system's controllability and operating efficiency.

[0033] Reference Figure 2 Furthermore, a rotating shaft 83 is rotatably connected to the frame 13, and the baffle 82 is fixedly installed on the rotating shaft 83 and can rotate with the rotating shaft 83. A transmission wheel is provided at one end of the rotating shaft 83, and a transmission rod is provided on the frame 13, which is perpendicular to the rotating shaft 83. A drive wheel is provided on the transmission rod, and the drive wheel is connected to the transmission wheel. Specifically, the transmission wheel and the drive wheel can be driven by gear transmission or chain transmission. When the transmission rod rotates, the drive wheel drives the transmission wheel to rotate, thereby causing the rotating shaft 83 to drive the baffle 82 to rotate, realizing the opening or closing of the baffle 82. The action of multiple baffles 82 can be controlled simultaneously by a single drive source and transmission rod. Through the cooperation of the transmission rod and transmission wheel, the linkage control of multiple baffles 82 can be realized, simplifying the drive structure and reducing the control complexity.

[0034] Reference Figure 6 The baffle 82 has a first slot 84 and a second slot 85 on the side away from the rotating shaft 83. The first slot 84 is used for the frame 13 to be engaged in the first state, and the second slot 85 is used for the frame 13 to be engaged in the second state. It is easy to understand that when the baffle 82 is in the first state or the second state, there can be a small gap between the baffle 82 and the frame 13 to allow smoke to pass through. The passage of a small amount of smoke will not affect the function of the baffle 82.

[0035] The inlet smoke chamber 11 and / or outlet smoke chamber 12 are equipped with gas analyzer interfaces and / or temperature sensor interfaces and / or pressure sensor interfaces. Specifically, gas analyzer interfaces and pressure sensor interfaces can be installed on the inlet pipe of the inlet smoke chamber 11, and gas analyzer interfaces, temperature sensor interfaces, and pressure sensor interfaces can be installed on the outlet smoke pipe of the outlet smoke chamber 12. These interfaces facilitate online monitoring of gas composition, temperature, and pressure, providing data support for system operation and control. For example, operating parameters can be adjusted based on the inlet gas concentration, and the adsorbent saturation level can be determined based on the outlet gas concentration.

[0036] This embodiment discloses a VOCs removal and purification method, applicable to any of the aforementioned VOCs removal and purification systems. The method includes the following steps: S1: The waste gas containing VOCs is introduced into the reaction tower 1 from the inlet flue box.

[0037] S2: The exhaust gas first flows through the gas duct 3 in the reaction tower 1, then passes through the grid assembly 4 and enters the packing unit 2. During the flow process, the first baffle 5, the second baffle 6, and the third baffle 7 work together to guide the gas flow along a preset path and prevent short-circuiting. After entering the packing unit 2, the gas comes into contact with the adsorbent inside the packing unit 2, and the VOCs in the exhaust gas are adsorbed and removed by the adsorbent.

[0038] S3: The purified gas after VOCs removal flows out from the other side of the packing unit 2, and is then collected through the air duct 3 on the other side before being discharged from the exhaust gas box 12.

[0039] Using the above method, the waste gas flow path is clearly defined, gas-solid contact is sufficient, purification efficiency is high, and the system structure is compact and operation is stable. When it is necessary to replace or regenerate the adsorbent, the discharge valve is opened, the adsorbent is discharged from the discharge hopper 22, and then fresh adsorbent is replenished from the feed inlet 21. When it is necessary to adjust the gas flow path or realize zone control, the baffle 82 is driven to rotate by the drive source, changing the opening state of the baffle 82, thereby realizing the on / off control of the packing grid.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A VOCs removal and purification system, characterized in that, include: The reaction tower (1) has an inlet smoke box (11) and an outlet smoke box (12), the inlet smoke box (11) and the outlet smoke box (12) are respectively arranged on opposite sides of the reaction tower (1); A packing unit (2) is vertically filled in the reaction tower (1). The packing unit (2) is vertically arranged between the inlet smoke box (11) and the outlet smoke box (12). The packing unit (2) is filled with adsorbent. There are multiple sets of packing units (2). Each set of packing units (2) is spaced apart. An air passage (3) is provided between adjacent packing units (2). The air passage (3) is located between the inlet smoke box (11) and the outlet smoke box (12). The air passage (3) is perpendicular to the inlet smoke box (11) and the outlet smoke box (12). The air passage (3) is used to allow gas to pass through along a preset path. A grid assembly (4) is provided in multiple sets and spaced apart in the reaction tower (1). The grid assembly (4) is located between the packing unit (2) and the gas passage (3) to support the packing unit (2).

2. The VOCs removal and purification system according to claim 1, characterized in that: The reaction tower (1) is provided with a frame (13). The grid assembly (4) includes multiple mounting plates (41) and grid plates (42). The mounting plates (41) are installed on the frame (13) at intervals. Multiple grid plates (42) are arranged at intervals between adjacent mounting plates (41). The bottom of the grid plates (42) is inclined towards the packing unit (2), and the horizontal projections of adjacent grid plates (42) overlap.

3. The VOCs removal and purification system according to claim 1, characterized in that: The air passage (3) includes multiple air inlet passages (31) and multiple air outlet passages (32). The air inlet passages (31) and air outlet passages (32) are respectively arranged on both sides of the packing unit (2). The end of the air outlet passage (32) near the air inlet smoke box (11) is provided with a first baffle plate (5). The two ends of the packing unit (2) are provided with second baffle plates (6). The end of the air inlet passage (31) near the air outlet smoke box (12) is provided with a third baffle plate (7).

4. The VOCs removal and purification system according to claim 1, characterized in that: The top of the packing unit (2) is provided with a feed inlet (21), and the bottom of the packing unit (2) is provided with a discharge hopper (22). The discharge hopper (22) is provided with a discharge valve, which is used to control the opening and closing of the discharge hopper (22).

5. A VOCs removal and purification system according to claim 2, characterized in that: Each of the packing units (2) includes multiple packing cells, the multiple packing cells forming a first packing group (24) in the horizontal direction, and the multiple packing cells forming a second packing group (25) in the vertical direction. Multiple first packing groups (24) and multiple second packing groups (25) are provided, and the first packing groups (24) and the second packing groups (25) are connected to each other.

6. The VOCs removal and purification system according to claim 5, characterized in that: The packing unit (2) is provided with a baffle assembly (8), which is spaced apart in the packing compartment of the first packing group (24). The baffle assembly (8) includes a drive source and a baffle (82). The baffle (82) is rotatably mounted on the frame (13). The drive source is connected to the baffle (82) in a transmission manner. The drive source is used to drive the baffle (82) to change between a first state and a second state.

7. A VOCs removal and purification system according to claim 6, characterized in that: A rotating shaft (83) is rotatably connected to the frame (13). The baffle (82) is fixedly installed on the rotating shaft (83) and can rotate with the rotating shaft (83). A transmission wheel is provided at one end of the rotating shaft (83). A transmission rod is provided on the frame (13). The transmission rod is perpendicular to the rotating shaft (83). A drive wheel is provided on the transmission rod. The drive wheel is connected to the transmission wheel in a transmission connection.

8. The VOCs removal and purification system according to claim 1, characterized in that: The inlet smoke box (11) and / or the outlet smoke box (12) are provided with a gas analyzer interface and / or a temperature sensor interface and / or a pressure sensor interface.

9. A VOCs removal and purification system according to claim 7, characterized in that: The baffle (82) has a first slot (84) and a second slot (85) on the side away from the rotating shaft. The first slot (84) is used for the frame (13) to be inserted in the first state, and the second slot (85) is used for the frame (13) to be inserted in the second state.

10. A VOCs removal and purification method, applied to the VOCs removal and purification system as described in any one of claims 1-9, characterized in that, Includes the following steps: The waste gas containing VOCs is introduced from the inlet flue box (11) into the reaction tower (1); The exhaust gas first flows through the gas duct (3) in the reaction tower (1), then passes through the grid assembly (4) and enters the packing unit (2), where it comes into contact with the packing in the packing unit (2) to carry out the VOCs removal reaction; The purified gas after VOCs removal flows out from the other side of the packing unit (2), and is then collected through the air passage (3) on the other side before being discharged from the exhaust smoke box (12).

Images