A rocking bed impregnation coating device for honeycomb catalysts

Abstract

The utility model relates to a kind of for honeycomb catalyst's shaking table type impregnation coating device, including slurry bucket, soaking pool, feed pipe, waste collection pipe, rotating shaft, variable frequency motor, slurry pump I, recovery bucket and slurry pump II;The bottom of the soaking pool is separately provided with feed pipe and waste collection pipe;The feed pipe is connected with slurry bucket by slurry pump I;The waste collection pipe is connected with recovery bucket by slurry pump II;The soaking pool is placed on support mesa respectively, and rotating shaft is fixedly connected at the bottom center of support mesa;The both ends of the rotating shaft are rotatably connected with field fixing frame, and its one end is connected with the output end of variable frequency motor corresponding.The utility model is by controllable swing mode, prevent active component settlement, maintain slurry dispersity, solve the problem of poor coating uniformity of impregnation coating inherent;Compared with the spraying system or circulating immersion system in the prior art, the dynamic impregnation mode of the utility model can significantly improve the adsorption saturation of catalyst channel.

Description

Technical Field

[0001] This utility model relates to the field of catalyst coating equipment technology, and in particular to a shaker-type impregnation coating device for honeycomb catalysts. Background Technology

[0002] In the steel sintering industry, incomplete combustion of fuel results in industrial waste gas containing large amounts of carbon monoxide (CO). Due to CO's high toxicity and potential for serious environmental pollution, efficient treatment technologies are increasingly valued. Among various treatment technologies, catalytic combustion has become a widely adopted industrial treatment solution due to its superior economic efficiency and energy utilization efficiency compared to other technologies.

[0003] Catalysts are the core of catalytic combustion technology. However, their active components are easily deactivated by contact with components such as sulfur dioxide (SO2), water vapor (H2O), and particulate matter in flue gas. To mitigate this poisoning, protective coatings are commonly applied to the catalyst surface in industry to physically isolate toxic components. Currently, the main coating processes include vacuum adsorption coating, ultrasonic coating, and impregnation coating. Among these, impregnation coating has become the dominant technology in large-scale industrial production due to its relatively simple equipment structure and high production efficiency.

[0004] However, existing industrial impregnation coating equipment generally suffers from two major technical bottlenecks: low slurry utilization rate, which leads to raw material waste and increased production costs; and poor coating uniformity, which directly affects the integrity and consistency of the protective coating, thereby damaging the catalyst's resistance to poisoning and its overall lifespan.

[0005] In existing technologies, spraying systems (such as CN221934393U, CN215197862U, CN216910327U) or circulating immersion systems are commonly used to solve the problem of active material deposition caused by static impregnation. However, these systems have drawbacks such as unsaturated adsorption in the catalyst channels and large footprint of the slurry circulation system. The slurry-spinning device disclosed in CN215197987U has a limited single-pass processing capacity due to the limitations of the clamping structure. Although the robotic arm solution in CN222625064U achieves automation, it does not solve the problem of impregnation uniformity.

[0006] The aforementioned problems severely restrict the production efficiency and quality of high-performance, long-life catalysts. Therefore, there is an urgent need to develop new, efficient, and highly uniform catalyst coating devices to promote the advancement of catalyst production technology. Summary of the Invention

[0007] To address the aforementioned problems, the present invention aims to provide a shaker-type impregnation coating device for honeycomb catalysts, which can effectively solve technical problems such as low slurry utilization, poor coating uniformity, and unsaturated adsorption in catalyst pores. It can improve slurry utilization, enhance coating uniformity, and improve the catalyst's resistance to poisoning and overall lifespan.

[0008] The technical solution adopted in this utility model is as follows: This utility model proposes a shaker-type impregnation and coating device for honeycomb catalysts, comprising a slurry tank, an immersion tank, a conveying pipe, a waste collection pipe, a rotating shaft, a variable frequency motor, a slurry pump I, a recovery tank, and a slurry pump II. The bottom of the immersion tank is respectively provided with a conveying pipe and a waste collection pipe. The conveying pipe is connected to the slurry tank via slurry pump I. The waste collection pipe is connected to the recovery tank via slurry pump II. The immersion tanks are respectively placed on a support platform, and a rotating shaft is fixedly connected through the center of the bottom of the support platform. Both ends of the rotating shaft are rotatably connected to a field-mounted frame, and one end is connected to the output end of the variable frequency motor.

[0009] Furthermore, the main body of the soaking tank is a cuboid structure with an inverted trapezoidal inner cavity, and a catalyst carrier slot is provided in the inner cavity.

[0010] Furthermore, the bottom of the soaking tank is equipped with an inclined guide plate to guide the slurry to form a vortex flow.

[0011] Furthermore, radial limiting plates are fixedly connected to both sides of the end of the rotating shaft to limit the rotation range of the rotating shaft.

[0012] Furthermore, a drain pipe is connected to the outside of the recycling bin via a valve.

[0013] Furthermore, a purging assembly is provided above the soaking tank.

[0014] Furthermore, the purging assembly includes a blower, a duct, and a hood; the hood is positioned above the soaking tank; and the top of the hood is connected to the blower via a duct.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By controlling the fluid through swaying, the sedimentation of active components is prevented and the dispersion of the slurry is maintained, effectively solving the problem of poor coating uniformity inherent in impregnation coating.

[0016] 2. By integrating a miniaturized soaking tank with a bottom return port, the pore filling rate is improved, solving the problems of large usage and low utilization rate of previous impregnation coating slurries. Attached Figure Description

[0017] Figure 1This is a schematic diagram of a shaker-type impregnation coating device for honeycomb catalysts proposed in this utility model.

[0018] In the attached drawings, the following labels are used: 1-slurry tank; 2-fan; 3-air hood; 4-soaking tank; 5-waste collection pipe; 6-catalyst carrier; 7-limiting plate; 8-rotating shaft; 9-variable frequency motor; 10-empty soaking tank; 11-slurry pump I; 12-drain pipe; 13-recovery tank; 14-slurry pump II; 15-air duct. Detailed Implementation

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] It should be noted that in the description of this utility model, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0021] See appendix Figure 1 The present invention proposes a shaking table type impregnation coating device for honeycomb catalysts, comprising a slurry tank 1, an immersion tank 4, a conveying pipe, a waste collection pipe 5, a rotating shaft 8, a variable frequency motor 9, a slurry pump I11, a recovery tank 13, and a slurry pump II14.

[0022] The soaking tank 4 has a rectangular structure to hold the impregnation slurry. The inner cavity of the soaking tank 4 is an inverted trapezoidal structure, and a groove for the catalyst carrier 6 is provided in the inner cavity to ensure the stability of the catalyst carrier 6 during shaking. An inclined guide plate is provided at the bottom of the soaking tank 4 to guide the slurry to form a vortex flow and improve the pore filling rate. The upper part of the soaking tank 4 is provided with a sealing cover to prevent the slurry from overflowing during shaking and causing slurry waste.

[0023] The bottom of the soaking tank 4 is equipped with a conveying pipe and a waste collection pipe 5. The conveying pipe is connected to the slurry tank 1 via a slurry pump I11. The slurry tank 1 is used to add impregnation slurry to the soaking tank 4. The slurry pump I11 can control the amount and speed of slurry addition. The waste collection pipe 5 is connected to the recycling tank 13 via a slurry pump II14. The conveying pipe and the waste collection pipe 5 are used to convey slurry before impregnation and to discharge slurry for recycling after impregnation.

[0024] The soaking tanks 4 are evenly placed on the support platform. Multiple small soaking tanks 4 arranged in series or parallel form a soaking tank group. Each unit is connected through a slurry pipe. A rotating shaft 8 is fixedly connected through the center of the bottom of the support platform. The two ends of the rotating shaft 8 are rotatably connected to the on-site fixed frame, and one end is connected to the output end of the variable frequency motor 9. The variable frequency motor 9 can adjust its output speed through the control system, thereby controlling the swaying amplitude of the rotating shaft 8.

[0025] In this embodiment, radial limiting plates 7 are fixedly connected to both sides of the end of the rotating shaft 8. The limiting plates 7 are located at the maximum swing angle of the rotating shaft 8 and are used to limit the rotation range of the rotating shaft 8, ensuring that the rotating shaft 8 can only reciprocate within the preset range, avoiding excessive shaking amplitude that could cause slurry splashing or damage to the vibrating plate. Under normal conditions, the rotation amplitude of the rotating shaft 8 is controlled by the variable frequency motor 9. The limiting plates 7 are used to prevent the rotation amplitude of the rotating shaft 8 from exceeding the limit due to unexpected situations. When the rotation amplitude of the rotating shaft 8 exceeds the preset range, the outer end of the limiting plate 7 can engage with the top of the on-site fixing frame, thereby preventing the rotating shaft 8 from rotating beyond the range.

[0026] The outside of the recycling tank 13 is connected to a drain pipe 12 via a valve. When the recycling tank 13 is full, the slurry can be discharged through the drain pipe 12.

[0027] In this embodiment, a purging assembly is also provided above the soaking tank 4; the purging assembly includes a blower 2, an air duct 15, and an air hood 3; the air hood 3 is correspondingly positioned directly above the soaking tank 4; the top input end of the air hood 3 is connected to the output end of the blower 2 through the air duct 15. After the blower 2 is started, it can deliver gas into the air hood 3 through the air duct 15, and the air hood 3 will purge the residual slurry on the surface of the carrier after the impregnation is completed, thereby accelerating the drying of the slurry on the surface of the carrier.

[0028] The working principle of this invention is as follows: First, a robotic arm places the catalyst carrier 6 into the catalyst carrier slot on the empty soaking tank 10. Then, the slurry in the slurry tank 1 is added to the empty soaking tank 10 via the slurry pump 111. Subsequently, the variable frequency motor 9 is started, driving the rotating shaft 8 to reciprocate. The limiting plate 7 controls the range of motion of the rotating shaft 8. The oscillation of the rotating shaft 8 causes the slurry in the soaking tank 4 to shake, thereby putting the catalyst carrier 6 in a dynamic impregnation state during the impregnation process, replacing the traditional static impregnation method.

[0029] The rotational speed of the variable frequency motor 9 can be adjusted according to actual needs, and a suitable oscillation frequency can be selected based on the characteristics of different catalyst carrier materials and impregnation slurries. The oscillation amplitude is controlled by the design of the limit plate 7 and the setting of the variable frequency motor 9.

[0030] During the dynamic impregnation process, the slurry can penetrate more evenly into the internal structure of the catalyst carrier 6 under the action of swaying, which significantly improves the impregnation effect. At the same time, the blower 2 is started, and gas is delivered into the air hood 3 through the air duct 15. The gas is evenly distributed on the surface of the catalyst carrier 6 through the air hood 3, which assists the impregnation process and accelerates the removal of excess slurry on the surface of the carrier.

[0031] After impregnation, the slurry is discharged into the recycling tank 13 by the slurry pump II14 for recycling, or the slurry is directly extracted from the drain port 12 for easy inspection of the impregnation.

[0032] By adopting a small-scale integrated soaking tank approach, the amount of slurry required for impregnation and coating is reduced while ensuring the stability of the catalyst carrier 6 during the shaking process. At the same time, the proportion of the recycling tank 13 is also reduced.

[0033] This invention utilizes a combination of a variable frequency motor 9 and a limiting plate 7 to achieve sway control of the impregnation bed. This keeps the catalyst carrier 6 in a dynamic state during the impregnation process, effectively solving problems such as uneven impregnation, low impregnation efficiency, and insufficient impregnation depth in traditional static impregnation. By adjusting the frequency of the variable frequency motor 9, it can adapt to the impregnation requirements of different types of catalyst carriers, improving the applicability and flexibility of the device. The design of the limiting plate 7 ensures the safety and controllability of the vibration process, avoiding slurry waste and equipment damage caused by excessive vibration.

[0034] Matters not covered in this utility model are common knowledge.

[0035] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A shaker-type dip-coating apparatus for honeycomb catalysts, characterized by: The device includes a slurry tank, a soaking tank, a conveying pipe, a waste collection pipe, a rotating shaft, a variable frequency motor, a slurry pump I, a recovery tank, and a slurry pump II. The bottom of each soaking tank is equipped with a conveying pipe and a waste collection pipe. The conveying pipe is connected to the slurry tank via slurry pump I. The waste collection pipe is connected to the recovery tank via slurry pump II. Each soaking tank is placed on a support platform, and a rotating shaft is fixedly connected through the center of the bottom of the support platform. Both ends of the rotating shaft are rotatably connected to a field-mounted frame, and one end is connected to the output end of the variable frequency motor.

2. The shaker-type impregnation coating apparatus for honeycomb catalysts according to claim 1, characterized in that: The soaking tank has a rectangular structure as its main body, an inverted trapezoidal inner cavity, and a catalyst carrier slot in the inner cavity.

3. A shaker-type dip coating device for honeycomb catalysts according to claim 2, characterized in that: The bottom of the soaking tank is equipped with an inclined guide plate to guide the slurry to form a vortex flow.

4. A shaker-type dip coating device for honeycomb catalysts according to claim 1, characterized in that: Radial limiting plates are fixed to both sides of the end of the rotating shaft to limit the rotation range of the rotating shaft.

5. A shaker-type impregnation coating apparatus for honeycomb catalysts according to claim 1, characterized in that: The outside of the recycling bin is connected to a drain pipe via a valve.

6. A shaker-type dip coating device for honeycomb catalysts according to claim 1, characterized in that: A purging assembly is installed above the soaking tank.

7. A shaker-type dip coating device for honeycomb catalysts according to claim 6, characterized in that: The purging assembly includes a blower, a duct, and a hood; the hood is positioned above the soaking tank; the top of the hood is connected to the blower via a duct.

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