A multi-layered sealed air hood for papermaking equipment

Abstract

This utility model discloses a multi-layered sealed air hood for papermaking equipment, comprising a cylindrical hollow sealed air hood, several support rings fixedly installed at equal intervals from bottom to top inside the cylindrical hollow sealed air hood, a packing tray installed at the top edge of the support rings, and a lower conical air-blocking hood installed at the bottom edge of the support rings. A water tank is welded and fixed to one outer wall of the cylindrical hollow sealed air hood. This utility model allows the waste gas treated by the spray tower to enter the cylindrical hollow sealed air hood, where the waste gas passes through multiple support rings, a cross-shaped spray structure, a packing tray, and a lower conical air-blocking hood sequentially from bottom to top. This results in the waste gas undergoing multiple layers of obstruction, packing purification, and spray treatment before being discharged, forming a multi-stage purification process. It fully utilizes the advantages of different treatment units to gradually reduce the concentration of harmful substances in the waste gas.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology in paper mills, specifically a multi-layer structure sealed air hood for papermaking equipment. Background Technology

[0002] In papermaking equipment waste gas treatment systems, enclosed hoods are primarily used to collect harmful gases generated during production, preventing them from leaking into the environment and thus protecting the health of operators and environmental safety. The hood typically consists of a robust, corrosion-resistant shell, sealing devices, inlet and outlet ports, and easily observable and maintainable access points. Durability and sealing are crucial considerations in the design to ensure stable system operation. The waste gas emission process involves the gas being collected within the hood, transported through connected exhaust pipes to a scrubbing tower or filtration system, where it undergoes multi-stage treatment to remove harmful components before finally being released into the atmosphere.

[0003] For example, the papermaking closed-loop exhaust gas whitening and deodorization equipment and system disclosed in authorization announcement number CN212283528U includes a tower body, an air inlet water collection section, a spray section, an air mist separation section, and an exhaust section. The air inlet water collection section includes a water storage tank, an air inlet, and a drain pipe. The water storage tank is used to purify paper fibers in the humid and hot gas and to recover and collect exhaust waste heat and water released from the exhaust gas. The drain pipe is used to transfer the exhaust waste heat and water released from the exhaust gas collected in the water storage tank to the process water. The exhaust section includes an exhaust port and a steam heater. Through the suction action of the exhaust fan, the exhaust gas in the gas collection hood is drawn from the bag area air box and enters the gas heat recovery device for recovery. Afterwards, the gas is connected to the inlet below the papermaking closed hood exhaust gas whitening and deodorization equipment. After being sprayed, separated by mist, and heated by the cooling tower, it is discharged from the exhaust port. However, the current closed hood does not have a spray structure or packing layer inside. After being treated by the spray pipe in the tower, the exhaust gas is directly discharged through the closed hood. The single spray pipe has limited processing capacity and is difficult to deal with complex or high-concentration pollutants in the exhaust gas. Moreover, the gas does not have sufficient residence time and contact area, which makes it difficult for the harmful components in the exhaust gas to be fully and evenly contacted and reacted, resulting in insufficient purification efficiency and the pollutants may not be effectively removed. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-layer structure sealed air hood for papermaking equipment. The cylindrical hollow sealed air hood is installed at the top opening of the tower body. After the exhaust gas treated by the spray tower enters the cylindrical hollow sealed air hood, the exhaust gas passes through multiple support rings, a cross-shaped spray structure, a packing tray, and a lower conical air-blocking hood from bottom to top. This allows the exhaust gas to be discharged after passing through multiple layers of blocking, packing purification, and spray treatment, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer structure papermaking equipment sealed air hood, comprising a cylindrical hollow sealed air hood, a plurality of support rings fixedly installed at equal intervals from bottom to top inside the cylindrical hollow sealed air hood, a packing tray installed at the top edge of the support rings, and a lower conical air-blocking hood installed at the bottom edge of the support rings. A water tank is welded and fixed to one outer wall of the cylindrical hollow sealed air hood. A cross-shaped spray structure is installed inside the cylindrical hollow sealed air hood below the support rings, and the liquid inlet end of the cross-shaped spray structure extends into the interior of the water tank.

[0006] Preferably, the support ring, packing tray, and lower conical air barrier are all made of stainless steel, and the outer diameter of the lower conical air barrier gradually decreases from one end near the support ring to the other end.

[0007] Preferably, a conical mask is bolted to the top opening of the cylindrical hollow sealed air hood, and a right-angle exhaust pipe is installed at the upper end of the conical mask.

[0008] Preferably, an inlet pipe assembly is installed on one outer wall of the water tank, the inlet pipe assembly including a right-angle inlet head installed on the outer wall of the water tank and a switch valve installed at the lower end of the right-angle inlet head.

[0009] Preferably, the cross-shaped spray structure includes a horizontal pipe installed on the inner wall of one side of a cylindrical hollow sealed air hood, and a vertical pipe with one end of the horizontal pipe intersecting and communicating with each other. Spray nozzles are installed on the lower surface of the horizontal pipe and the vertical pipe, and one end of the horizontal pipe extends into the interior of the water tank.

[0010] Preferably, a spiral cross-bracing is welded and fixed to the lower surface of the support ring.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: This multi-layer structure papermaking equipment sealed hood utilizes a combination of a cylindrical hollow sealed hood, multiple support rings from bottom to top, a packing tray, a cross-shaped spray structure, and a lower conical gas barrier. The cylindrical hollow sealed hood is installed at the top opening of the tower body. After the exhaust gas treated by the spray tower enters the cylindrical hollow sealed hood, it passes through multiple support rings, the cross-shaped spray structure, the packing tray, and the lower conical gas barrier sequentially from bottom to top. This allows the exhaust gas to pass through multiple layers of obstruction, packing purification, and spray treatment before being discharged, forming a multi-stage purification process. This fully utilizes the advantages of different treatment units to gradually reduce the concentration of harmful substances in the exhaust gas, ensuring that the exhaust gas emissions meet environmental protection standards. Furthermore, installing the cylindrical hollow sealed hood at the top opening of the tower body creates a closed and continuous treatment space, effectively preventing untreated exhaust gas from leaking into the external environment. In the process of the exhaust gas flowing from bottom to top, the support ring not only provides stable support for the packing trays and the lower conical gas baffle, but also plays a certain role in blocking the flow of exhaust gas along the predetermined path. This ensures that the exhaust gas is evenly distributed when it flows through each treatment stage, avoiding localized excessive flow velocity or stagnation, thereby improving the overall treatment effect. Secondly, the cross-shaped spray pipe layout is reasonable, and the spray liquid can be evenly sprayed into the exhaust gas flow, maximizing the gas-liquid contact area. This not only improves the reaction efficiency between pollutants and reagents, but also ensures the uniform distribution of the spray liquid throughout the spray area, avoiding dead corners and short circuits. Furthermore, the packing layer between two adjacent packing trays has a large specific surface area, which can maximize the gas-liquid contact in a limited space, promote the absorption, reaction, and decomposition of pollutants, and ensure that the exhaust gas has sufficient residence time when passing through the packing layer, thereby achieving more thorough purification. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0014] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0015] Figure 4 This is a three-dimensional cross-sectional structural diagram of the present invention;

[0016] Figure 5 This is a three-dimensional cross-sectional structural diagram of the present invention.

[0017] In the diagram: 1. Cylindrical hollow sealed air hood; 101. Conical mask; 102. Right-angle exhaust pipe; 2. Water tank; 3. Liquid inlet pipe assembly; 4. Support ring; 401. U-shaped staggered frame; 5. Packing tray; 6. Cross-shaped spray structure; 601. Horizontal pipe; 602. Vertical pipe; 603. Spray head; 7. Lower conical air-blocking hood. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the 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 scope of protection of the present utility model.

[0019] Please see Figure 1-5 This utility model provides an embodiment of a multi-layer structure papermaking equipment airtight hood, including a cylindrical hollow airtight hood 1, a plurality of support rings 4 fixedly installed at equal intervals from bottom to top inside the cylindrical hollow airtight hood 1, a filler tray 5 installed at the top edge of the support rings 4, and a lower conical air-blocking hood 7 installed at the bottom edge of the support rings 4. A water tank 2 is welded and fixed to one side of the outer wall of the cylindrical hollow airtight hood 1. A cross-shaped spray structure 6 is installed inside the cylindrical hollow airtight hood 1 below the support rings 4. The liquid inlet end of the cross-shaped spray structure 6 extends into the interior of the water tank 2. Different chemical agents can be added to the spray liquid according to the treatment requirements to improve the treatment efficiency.

[0020] The support ring 4, the packing tray 5, and the lower conical air barrier 7 are all made of stainless steel. The outer diameter of the lower conical air barrier 7 gradually decreases from one end near the support ring 4 to the other end. The lower conical air barrier 7 is used to block the airflow speed and direction of the exhaust gas and increase the residence time of the exhaust gas in the spray layer and the packing layer.

[0021] A conical mask 101 is bolted to the top opening of the cylindrical hollow sealed air hood 1, and a right-angle exhaust pipe 102 is installed at the upper end of the conical mask 101. The cylindrical hollow sealed air hood 1 can effectively isolate the waste gas treatment area from the external environment, prevent the leakage of untreated waste gas, and ensure that pollutants are fully purified in the system before being discharged. The purified gas is discharged to the next stage of waste gas treatment equipment through the conical mask 101 and the right-angle exhaust pipe 102.

[0022] An inlet pipe assembly 3 is installed on one side of the outer wall of the water tank 2. The inlet pipe assembly 3 includes a right-angle inlet head installed on the outer wall of the water tank 2 and a switch valve installed at the lower end of the right-angle inlet head. The lower end of the inlet pipe assembly 3 is connected to the delivery pump of the external spraying agent. The spraying agent enters the water tank 2 through the inlet pipe assembly 3 and is diverted into each cross-shaped spray structure 6. The cross-shaped spray structure 6 sprays the agent evenly into the packing layer below.

[0023] The cross-shaped spray structure 6 includes a horizontal pipe 601 installed on one side of the inner wall of the cylindrical hollow sealed air hood 1, and a vertical pipe 602 with one end of the horizontal pipe 601 intersecting and communicating with each other. Spray nozzles 603 are installed on the lower surface of the horizontal pipe 601 and the vertical pipe 602. One end of the horizontal pipe 601 extends into the interior of the water tank 2. The liquid medicine in the water tank 2 enters the vertical pipe 602 through the horizontal pipe 601, and the liquid medicine is sprayed out by the spray nozzles 603 on the lower surface of the vertical pipe 602 and the horizontal pipe 601. Its cross-shaped layout can ensure that the spray liquid covers a wider area during the spraying process and increase the uniformity of gas-liquid contact.

[0024] A spiral crossbeam 401 is welded and fixed to the lower surface of the support ring 4. By welding and fixing the spiral crossbeam 401 to the lower surface of the support ring 4, the structural strength of the support ring 4 is improved.

[0025] In this embodiment, after the exhaust gas enters the cylindrical hollow sealed hood 1, it encounters multiple support rings 4 from bottom to top. The function of the support rings 4 is to stabilize the packing trays 5 and the lower conical gas barrier 7, ensuring that the gas flow path remains unobstructed and uniform as it passes through each treatment layer. The lower conical gas barrier 7 acts as a barrier to prevent the exhaust gas from backflowing or short-circuiting inside the hood, ensuring that the exhaust gas flows along a predetermined route and avoiding the accumulation of pollutants in certain areas, thereby achieving a more uniform treatment effect. After passing through the support rings 4, the exhaust gas enters the area where the packing trays 5 are located. Vertically adjacent packing trays 5... The filling material is laid between the layers, and the filling layer has a large specific surface area, providing sufficient contact space for the exhaust gas. In this layer, the cross-shaped spray structure 6 sprays liquid onto the surface of the filling material, which fully contacts the pollutants in the exhaust gas. The harmful components in the exhaust gas undergo chemical reaction or physical adsorption with the liquid on the surface of the filling material, thereby significantly reducing their concentration. The cross-shaped spray structure 6 sprays liquid evenly to form a fine liquid film, which enhances the gas-liquid contact effect and performs secondary spray treatment on the exhaust gas after absorption by the filling material, further capturing the residual pollutants. After being blocked by multiple layers and purified by the filling material, the gas is discharged from the cylindrical hollow sealed gas hood 1.

Claims

1. A multi-layered sealed air hood for papermaking equipment, characterized in that: The device includes a cylindrical hollow sealed air hood (1), several support rings (4) fixedly installed at equal intervals from bottom to top inside the cylindrical hollow sealed air hood (1), a packing tray (5) installed at the top edge of the support rings (4), and a lower conical air-blocking hood (7) installed at the bottom edge of the support rings (4). A water tank (2) is welded and fixed to one side of the outer wall of the cylindrical hollow sealed air hood (1). A cross-shaped spray structure (6) is installed inside the cylindrical hollow sealed air hood (1) below the support rings (4), and the liquid inlet end of the cross-shaped spray structure (6) extends into the interior of the water tank (2).

2. The airtight hood for a multi-layer papermaking equipment according to claim 1, characterized in that: The support ring (4), the packing tray (5), and the lower conical air barrier (7) are all made of stainless steel. The outer diameter of the lower conical air barrier (7) gradually decreases from one end near the support ring (4) to the other end.

3. The multi-layer structure papermaking equipment sealed air hood according to claim 1, characterized in that: A conical mask (101) is bolted to the top opening of the cylindrical hollow sealed air hood (1), and a right-angle exhaust pipe (102) is installed at the upper end of the conical mask (101).

4. The airtight hood for a multi-layer papermaking equipment according to claim 1, characterized in that: An inlet pipe assembly (3) is installed on one side of the outer wall of the water tank (2). The inlet pipe assembly (3) includes a right-angle inlet head installed on the outer wall of the water tank (2) and a switch valve installed at the lower end of the right-angle inlet head.

5. The multi-layer structure papermaking equipment sealed air hood according to claim 1, characterized in that: The cross-shaped spray structure (6) includes a horizontal pipe (601) installed on the inner wall of one side of a cylindrical hollow sealed air hood (1), and a vertical pipe (602) with one end of the horizontal pipe (601) intersecting and communicating with each other. Spray nozzles (603) are installed on the lower surfaces of the horizontal pipe (601) and the vertical pipe (602). One end of the horizontal pipe (601) extends into the interior of the water tank (2).

6. The multi-layer structure papermaking equipment airtight hood according to claim 1, characterized in that: The lower surface of the support ring (4) is welded and fixed with a spiral cross frame (401).

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