A papermaking odor conveying demister cleaning device

Abstract

The utility model discloses a papermaking stench gas conveying demister cleaning device relates to papermaking stench gas conveying demister field, including the double -deck drawer type baffle installed in papermaking stench gas conveying demister, still includes the cleaning pipeline installed in the same side of every layer drawer type baffle, the cleaning pipeline includes horizontal branch pipe and vertical branch pipe, install a plurality of dry dusting nozzles on the horizontal branch pipe, install a plurality of cleaning nozzles on the vertical branch pipe, the nozzle direction of dusting nozzle and cleaning nozzle is opposite drawer type baffle, the end of cleaning pipeline that extends from demister inside is connected with the interface pipeline of being located demister outside through flange, install the tee on the interface pipeline, one export of tee connects spare high pressure interface, another export of tee connects spare high pressure interface. The utility model can clean drawer type baffle efficiently.

Description

Technical Field

[0001] This utility model relates to the field of papermaking odor conveying demisters, specifically to a cleaning device for papermaking odor conveying demisters. Background Technology

[0002] The core of papermaking lies in the different pulping methods. Common methods include chemical methods (sulfate cooking) or mechanical methods for fiber separation. Modern technology uses oxygen-based delignin removal to reduce pollution. Existing paper mills primarily use the chemical method (sulfate cooking). However, the pulping and cooking process (such as the sulfate process) produces sulfur-containing gases such as hydrogen sulfide (H2S), methanethiol (CH3SH), and dimethyl sulfide (CH3SCH3). These substances have a strong rotten egg odor and are highly toxic, requiring collection and transportation to incineration sites for treatment. During the transport of odorous gases, the collected gases need to be pre-treated to ensure more effective delivery to the incineration site. A key aspect is addressing the moisture content of the odorous gases during transport. Baffle plate demisters are highly efficient gas-liquid separation devices. Their working principle is based on inertial collision, gravity settling, and interception effects. Multi-directional structural designs (such as herringbone or roof-shaped plates) increase the collision probability, improving demisting efficiency to over 98%.

[0003] During transport, odorous gases are accompanied by some broken fibers to the upstream treatment point. Due to the special structure of the baffle plate, some fibers adhere to its surface during demisting. Initially, conventional demisters use atomizing nozzles to clean the adhered fibers. The purpose of the demister is to remove water droplets carried by the odorous gases. However, if it is operated for an extended period, more water droplets that cannot settle due to gravity will adhere to the baffle plate and be carried into the subsequent treatment stages. Therefore, the demisting cycle is generally manually controlled to be once every 8 hours for 5-10 minutes each time. However, after a period of operation, fibers will gradually accumulate on the baffle plate, forming a thick film. The effect of conventional atomizing spray becomes increasingly poor, eventually becoming ineffective. Fiber accumulation not only affects the demisting efficiency of the demister but also reduces the equipment's flow area, increases pressure loss, and in severe cases, can even affect the normal operation of downstream equipment. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a papermaking odor conveying demister cleaning device, which continuously washes the baffle plate through the ash removal nozzle, effectively washing away the accumulated fibers on the baffle plate, and further removes the accumulated fibers by cleaning the blocky accumulated fibers washed away by the ash removal nozzle through the cleaning nozzle, thus efficiently cleaning the baffle plate.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A papermaking odor conveying demister cleaning device includes a double-layer drawer-type baffle plate installed inside the papermaking odor conveying demister, and a cleaning pipe installed on the same side of each drawer-type baffle plate. The cleaning pipe includes a horizontal branch pipe and a vertical branch pipe. A plurality of dust removal nozzles are installed on the horizontal branch pipe, and a plurality of cleaning nozzles are installed on the vertical branch pipe. The nozzle directions of the dust removal nozzles and the cleaning nozzles are directly opposite the drawer-type baffle plate. The end of the cleaning pipe extending from inside the demister is connected to the interface pipe located at the top of the demister via a flange. A tee is installed on the interface pipe, with one outlet of the tee connected to a spare high-pressure interface and the other outlet of the tee connected to a spare high-pressure interface.

[0006] Optionally, the horizontal branch pipe and the vertical branch pipe are respectively provided with a horizontal branch pipe interface and a vertical branch pipe interface. Both the horizontal branch pipe interface and the vertical branch pipe interface are equipped with internal threaded pipe joints. The dust removal nozzle includes an internal threaded dust removal nozzle that can be threadedly connected to the internal threaded pipe joint. The cleaning nozzle includes an internal threaded cleaning nozzle that can be threadedly connected to the internal threaded pipe joint.

[0007] Optionally, the distance between the horizontal and vertical branch pipes and the drawer-type baffle is 450~500mm.

[0008] Optionally, the spray spacing of the ash removal nozzles is 450 mm, and the spray diffusion area of ​​the ash removal nozzles is 0.1 m². 2 .

[0009] Furthermore, there are four dust removal nozzles, each installed at a point half the length of the horizontal branch pipe; there are four horizontal branch pipes, with the interface located at a point a quarter the length of the vertical branch pipe.

[0010] Optionally, the spray spacing of the cleaning nozzle is 450 mm, and the spray diffusion area of ​​the cleaning nozzle is 0.2 m². 2 .

[0011] Furthermore, there are two cleaning nozzles, which are installed at 1 / 3 and 2 / 3 length points on the vertical branch pipe, respectively.

[0012] Furthermore, the front end of the internally threaded cleaning nozzle is spiral-shaped.

[0013] Compared with the prior art, the papermaking odor conveying demister cleaning device provided by this utility model has the following beneficial effects: 1. It can efficiently clean drawer-type baffles by continuously rinsing them with dust removal nozzles, effectively washing away accumulated fibers. The cleaning nozzles further remove the clumps of accumulated fibers washed away by the dust removal nozzles.

[0014] 2. Reserve an external interface at the interface. When the low-pressure water in the factory is insufficient to wash away the accumulated fibers, the factory's mobile high-pressure cleaning equipment can be used to connect the pressurized water through the spare high-pressure interface to provide high-pressure water to the dust removal nozzle to clean the dust accumulation on the surface of the drawer-type baffle plate, thereby enhancing the cleaning effect.

[0015] 3. Through efficient dust removal, the operating resistance of the equipment is reduced by 10-20%.

[0016] 4. It has a continuous dust cleaning function, reducing the annual maintenance time to less than 30 hours. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the cleaning nozzle of this utility model; Figure 3 This is a schematic diagram of the installation of the drawer-type baffle of this utility model; Figure 4 This is a schematic diagram of the dust removal nozzle structure of this utility model; Figure 5 This is a schematic diagram of the cleaning nozzle structure of this utility model.

[0019] Explanation of reference numerals in the attached diagram: 1. Ash removal nozzle, 2. Cleaning nozzle, 3. Spare high-pressure interface, 4. Common interface, 5. Vertical branch pipe, 6. Horizontal branch pipe, 7. Bottom drain outlet, 8. Drawer-type baffle, 9. Internal threaded pipe connector, 10. Internal threaded cleaning nozzle, 11. Internal threaded ash removal nozzle, 12. Vertical branch pipe interface, 13. Horizontal branch pipe interface. Detailed Implementation

[0020] 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.

[0021] The paper mill odor conveying demister is a standard piece of equipment in the process of conveying odorous gases in paper mills. Its main function is to remove droplets carried by the odorous gases during the conveying process due to temperature reduction and spray dust removal, thereby reducing unnecessary heat loss during the combustion treatment of odorous gases.

[0022] The paper mill odor conveying demister is designed according to the volume of odorous gas. The conventional design ensures that the cross-sectional velocity of the odorous gas passing through the demister channel is 5 m / s, with a gas volume of 5000 Nm³. 3 The windward area is 0.57m x 0.57m. The baffles are fixed with specially made steel plates with clips, spaced 25mm apart, forming a detachable "drawer shape," also called a drawer-type baffle. The length and height of the drawer-type baffle are designed according to the dimensions of the windward surface, while the width is 235mm. After the dimensions of the drawer-type baffle are confirmed, the entire drawer-type baffle is wrapped with steel plates, leaving appropriate gaps for operation depending on the level of manufacturing craftsmanship.

[0023] The paper mill odor conveying demister is equipped with a double-layer drawer-type baffle plate. The spacing of the drawer-type baffle plate is designed based on the spray spacing of the ash removal nozzle and the cleaning nozzle. When the cross-sectional area is greater than 1m×1m, a double layer is set to avoid excessive weight and inconvenience in disassembly when it is necessary to disassemble later.

[0024] This utility model provides a cleaning device for a papermaking odor conveying demister, such as... Figures 1-5 As shown, the device includes a double-layer drawer-type baffle plate 8 installed inside the papermaking odor conveying demister, and a cleaning pipe installed on the same side of each drawer-type baffle plate 8. The cleaning pipe includes a horizontal branch pipe 6 and a vertical branch pipe 5. The distance between the horizontal branch pipe 6 and the vertical branch pipe 5 and the drawer-type baffle plate 8 is preferably between 450 and 500 mm. Several dust removal nozzles 1 are installed on the horizontal branch pipe 6, and several cleaning nozzles 2 are installed on the vertical branch pipe 5. The horizontal branch pipe 6 and the vertical branch pipe 5 are respectively provided with a horizontal branch pipe interface 13 and a vertical branch pipe interface 12. Both the horizontal branch pipe interface 13 and the vertical branch pipe interface 12 are equipped with internal threaded pipe joints 9. The dust removal nozzle 1 includes an internal threaded dust removal nozzle 11 that can be threadedly connected to the internal threaded pipe joint 9. The cleaning nozzle 2 includes an internal threaded cleaning nozzle 10 that can be threadedly connected to the internal threaded pipe joint 9. The nozzles of the internal threaded cleaning nozzle 10 and the internal threaded dust removal nozzle 11 face the drawer-type baffle plate 8. This invention arranges a cleaning device on the front of the drawer-type baffle (in the direction of gas flow), which can improve dust removal efficiency. At the same time, the powerful impact of the dust removal nozzle can clean the fibers adsorbed on the surface of the demister.

[0025] In this invention, the spray spacing of the ash removal nozzle 1 is 450mm, and the spray diffusion area of ​​the ash removal nozzle 1 is 0.1m. 2 With a gas volume of 5000 Nm3 / h, taking a windward area of ​​0.57m × 0.57m as an example, the area of ​​the drawer-type baffle is 0.33m². 2 Four dust removal nozzles are required, each installed at a point half the length of the horizontal branch pipe 6. Four nozzles are arranged on the horizontal branch pipe 6, with the interface located at the 1 / 4 mark of the vertical branch pipe. The installation principle is to ensure complete coverage of the drawer-type baffle. Preferably, the internally threaded dust removal nozzle 11 is an integrated threaded nozzle. The internally threaded dust removal nozzle 11 of this invention is connected by threads, facilitating disassembly, cleaning, and replacement. Simultaneously, by changing the pressure, the impact force of the water jet can be increased, thereby achieving efficient dust removal.

[0026] In this invention, the spray spacing of the cleaning nozzle 2 is 450mm, and the spray diffusion area of ​​the cleaning nozzle 2 is 0.2m. 2 With a gas volume of 5000 Nm 3 / h, taking a windward area of ​​0.57m × 0.57m as an example, the area of ​​the drawer-type baffle is 0.33m². 2 Two cleaning nozzles are required, installed at 1 / 3 and 2 / 3 length points on the vertical branch pipe 5, respectively, ensuring complete coverage of the drawer-type baffle. Preferably, the internally threaded cleaning nozzle 10 is a one-piece threaded nozzle. Furthermore, the front end of the internally threaded cleaning nozzle 10 is spiral-shaped. Water passing through the spiral nozzle atomizes over a large area but with low impact force. Therefore, when used in conjunction with the dust removal nozzle 1, it improves the overall coverage and cleaning effect of the demister baffle. The internally threaded cleaning nozzle 10 of this invention is easily disassembled, cleaned, and replaced via a threaded connection; simultaneously, the spiral structure allows for a wider atomization area, cleaning the surface through atomized water droplets.

[0027] In this invention, the cleaning pipe extends from inside the demister and is welded to it. It connects to an interface pipe located outside the demister via a flange. The outlet of the interface pipe serves as the connection point for both the backup high-pressure interface 3 and the regular interface 4. A tee is welded to the interface pipe, with one outlet of the tee connected to the backup high-pressure interface 3 via a flange, and the other outlet connected to the regular interface 4 via a flange. The installation location is determined based on the actual construction site conditions, typically prioritizing proximity and convenience. For fibers that are difficult to remove with low-pressure water from the factory after prolonged operation, after cleaning with the regular interface 4, if it is still difficult to clean thoroughly by checking through the observation door, the system switches to the backup high-pressure interface 3. The factory's mobile high-pressure cleaning equipment is used, and water pressurized by the built-in booster pump is connected to the backup high-pressure interface 3 via a pipeline. This provides high-pressure water to the dust removal nozzle 1 to clean the accumulated dust on the surface of the drawer-type baffle plate 8, enhancing the cleaning effect.

[0028] In this invention, a bottom drain port 7 is installed at the lower end of the demister. The bottom drain port 7 is connected to a drain pipe through a flange, which is used to discharge the spray water and water in the odor collected by the demister to a designated location in the factory.

[0029] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 The working principle of the papermaking odor conveying demister cleaning device of this utility model is introduced as follows: Cleaning process for common interfaces: 1. Observe through the manhole. If there is a lot of dust, notify the operator to prepare for cleaning; 2. Open the valve on the common interface pipe and wait for 3-5 minutes; 3. Close the valve on the common interface pipe; 4. Observe through the manhole. If there is no obvious dust accumulation on the drawer-type baffle, cleaning is complete. Backup high-pressure interface cleaning process: 1. Observe through the manhole. If the commonly used interface is not cleaned thoroughly and there is a lot of dust on the surface of the drawer-type baffle, prepare to use the backup high-pressure interface for cleaning; 2. Prepare the mobile high-pressure cleaning equipment and complete the connection; 3. Open the valve on the backup high-pressure interface pipeline, turn on the mobile high-pressure cleaning equipment, adjust the pressure, and wait for 3-5 minutes; 4. Turn off the mobile high-pressure cleaning equipment and close the valve on the backup high-pressure interface pipeline; 5. Observe through the manhole. If there is no obvious dust accumulation on the drawer-type baffle, the cleaning is complete; if there is residual dust, adjust the pressure of the mobile high-pressure cleaning equipment and continue cleaning until there is no obvious dust accumulation on the drawer-type baffle, the cleaning is complete.

[0030] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of this utility model.

Claims

1. A cleaning device for a papermaking odor conveying demister, comprising a double-layer drawer-type baffle plate installed inside the papermaking odor conveying demister, and a cleaning pipe installed on the same side of each drawer-type baffle plate, characterized in that, The cleaning pipeline includes horizontal branch pipes and vertical branch pipes. Several dust removal nozzles are installed on the horizontal branch pipes, and several cleaning nozzles are installed on the vertical branch pipes. The nozzles of the dust removal nozzles and cleaning nozzles are facing the drawer-type baffle. The end of the cleaning pipe extending from inside the demister is connected to the interface pipe located at the top of the demister via a flange. A tee is installed on the interface pipe, with one outlet of the tee connected to a spare high-pressure interface and the other outlet of the tee connected to a spare high-pressure interface.

2. The papermaking odor conveying demister cleaning device according to claim 1, characterized in that, The horizontal and vertical branch pipes are respectively provided with a horizontal branch pipe interface and a vertical branch pipe interface. Both the horizontal and vertical branch pipe interfaces are equipped with internal threaded pipe joints. The dust removal nozzle includes an internal threaded dust removal nozzle that can be threadedly connected to the internal threaded pipe joint. The cleaning nozzle includes an internal threaded cleaning nozzle that can be threadedly connected to the internal threaded pipe joint.

3. The papermaking odor conveying demister cleaning device according to claim 1, characterized in that, The distance between the horizontal and vertical branch pipes and the drawer-type baffle is 450~500mm.

4. The papermaking odor conveying demister cleaning device according to claim 1, characterized in that, The spray spacing of the ash removal nozzles is 450mm, and the spray diffusion area of ​​the ash removal nozzles is 0.1m. 2 .

5. The papermaking odor conveying demister cleaning device according to claim 4, characterized in that, There are four dust removal nozzles, each installed at a point half the length of the horizontal branch pipe; there are four horizontal branch pipes, with the interface located at a point a quarter the length of the vertical branch pipe.

6. The papermaking odor conveying demister cleaning device according to claim 1, characterized in that, The spray spacing of the cleaning nozzle is 450mm, and the spray diffusion area of ​​the cleaning nozzle is 0.2m. 2 .

7. The papermaking odor conveying demister cleaning device according to claim 6, characterized in that, Two cleaning nozzles are arranged, installed at 1 / 3 and 2 / 3 length points on the vertical branch pipe, respectively.

8. The papermaking odor conveying demister cleaning device according to claim 2, characterized in that, The front end of the internally threaded cleaning nozzle is spiral-shaped.

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