Water curtain dust removal box for thermal cracking tail gas

Abstract

This utility model relates to a water curtain dust collector for pyrolysis exhaust gas, including a water storage tank and an air inlet box fixedly installed on the top of the water storage tank. A dust collector box is fixedly installed on one side of the air inlet box. Two partition plates are staggered and fixedly connected to the inner wall of the water storage tank. An air inlet is provided at the top of the air inlet box, and the left end of the dust collector box is connected to the air inlet box. A rotating shaft is provided inside the dust collector box. The rotating shaft has a hollow structure, and one end of the rotating shaft extends to the outside of the air inlet box where a drive assembly is provided. The drive assembly is used to drive the rotating shaft to rotate. This utility model uses a drive motor to drive the rotating shaft to rotate, so that the nozzles rotate synchronously when spraying water. Combined with the pressurization of the high-pressure water pump, water mist is formed, and secondary atomization is formed after impacting the inner wall of the dust collector box. The angled setting of the nozzles can form a three-dimensional water mist network at the center of the rotating shaft, significantly increasing the contact area between the exhaust gas and water, ensuring the dust removal effect.

Description

Technical Field

[0001] This utility model relates to the field of pyrolysis tail gas purification technology, specifically a water curtain dust collector for pyrolysis tail gas. Background Technology

[0002] Waste plastic pyrolysis is a resource utilization technology that decomposes waste plastics into industrial carbon black and heavy oil through heating. The pyrolysis process produces exhaust gas containing harmful substances such as sulfides and nitrogen oxides. These exhaust gases contain particulate matter and acidic gas components. In order to avoid secondary pollution, the pyrolysis exhaust gas needs to be purified. At present, the pyrolysis exhaust gas contains not only particulate matter but also some sticky oil mist, which makes traditional bag dust collectors prone to clogging and failure. Dry electrostatic precipitators are not efficient enough for high-humidity sticky dust, so water washing dust removal is required.

[0003] Currently, conventional water curtain dust removal structures have poor contact between exhaust gas and water, resulting in low dust removal efficiency. Furthermore, when the exhaust gas flow rate fluctuates, the exhaust gas velocity becomes too fast, which can easily lead to insufficient contact between the exhaust gas and water, affecting the purification effect. Based on this, we propose a water curtain dust removal box for pyrolysis exhaust gas to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a water curtain dust collector for pyrolysis exhaust gas, which increases the probability of dust contact with water. This solves the problems of poor contact between exhaust gas and water in existing water curtain dust collector structures, resulting in low dust removal efficiency. Furthermore, when the exhaust gas flow rate fluctuates, the exhaust gas velocity is too fast, which can easily cause insufficient contact between exhaust gas and water, affecting the purification effect.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a water curtain dust collector for pyrolysis tail gas, including a water storage tank and an air inlet box fixedly installed on the top of the water storage tank. A dust collector box is fixedly installed on one side of the air inlet box. Two partition plates are staggered and fixedly connected to the inner wall of the water storage tank. An air inlet is provided on the top of the air inlet box, and the left end of the dust collector box is connected to the air inlet box. A rotating shaft is provided inside the dust collector box. The rotating shaft has a hollow structure. One end of the rotating shaft extends to the outside of the air inlet box and is provided with a drive assembly. The drive assembly is used to drive the rotating shaft to rotate. The other end of the rotating shaft extends to the outside of the dust collector box and is provided with a rotary joint. A water curtain assembly is provided on the surface of the rotating shaft. When the rotating shaft rotates, the water curtain assembly sprays water and forms a water mist network inside the dust collector box. A water circulation assembly is provided between the rotary joint and the water storage tank.

[0006] It should be noted that the water storage tank is equipped with a water inlet (not shown in the figure) for water supply and a sewage outlet (not shown in the figure), while the dust collector box has an openable maintenance door on the side for maintenance and inspection, and is equipped with a visual observation window.

[0007] Furthermore, two dividing plates separate the two ends of the water storage tank into a sedimentation zone and a purification zone, while the two dividing plates and the inner wall of the water storage tank enclose a filtration zone, and the bottom of the air intake box and the top of the sedimentation zone are connected.

[0008] Furthermore, the two ends of the rotating shaft are rotatably connected to the inner walls of the air inlet box and the dust removal box, respectively. The hollow cavity of the rotating shaft is a water passage chamber to provide a channel for water. The surface of the rotating shaft is provided with a turbulence component on the inner side of the air inlet box.

[0009] Furthermore, the turbulence assembly includes a guide plate fixedly mounted on the surface of the rotating shaft. The guide plate has a spiral structure and guides the exhaust gas as it rotates, forming a stable spiral downward trajectory.

[0010] Furthermore, the drive assembly includes a drive motor fixedly mounted on the surface of the water storage tank. The output end of the drive motor is fixedly connected to a transmission wheel, and one end of the rotating shaft is equipped with the same transmission wheel. The two transmission wheels are connected by a belt drive, and the drive motor is used to drive the rotating shaft to rotate.

[0011] Furthermore, the water curtain assembly includes a branch pipe fixedly installed on the surface of the rotating shaft. Multiple nozzles are distributed in a ring array on the surface of the branch pipe, and the nozzles all face the vertical center line of the rotating shaft.

[0012] Furthermore, the water circulation assembly includes a high-pressure water pump fixedly installed on the surface of the water storage tank. The input end of the high-pressure water pump is connected to the clean water area, and the output end of the high-pressure water pump is connected through a pipeline and a rotary joint. The high-pressure water pump is used to pressurize water and send it into the hollow cavity of the rotating shaft.

[0013] Furthermore, an exhaust port is provided on the side of the lower end face of the dust collector, and an inductive sensor is provided in both the exhaust port and the air inlet. The inductive sensor is used to detect pressure changes in the two ports.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] 1. The water curtain dust collector for pyrolysis exhaust gas is driven by a motor to rotate the rotating shaft, so that the nozzles rotate synchronously when spraying water. Combined with the pressurization of the high-pressure water pump, water mist is formed, and secondary atomization is formed after impacting the inner wall of the dust collector. The angled setting of the nozzles can form a three-dimensional water mist network at the center of the rotating shaft, which greatly increases the contact area between the exhaust gas and water and ensures the dust removal effect.

[0016] 2. In this water curtain dust collector for pyrolysis tail gas, after the tail gas enters the inlet box, the guide plate guides the tail gas to form a stable spiral downward trajectory, prolonging the residence time of the tail gas in the dust collector box, avoiding the problem of insufficient contact caused by excessive local flow velocity, and improving the dust removal efficiency of the tail gas.

[0017] 3. The water curtain dust collector for pyrolysis exhaust gas provides information data for control based on the pressure changes at the inlet and outlet. It can adjust the motor speed according to the exhaust gas volume to achieve the synergistic effect of rotating water mist and spiral airflow. It can adapt to changes in exhaust gas flow rate, ensure the stability of airflow and water mist, prevent fluctuations in purification effect, and improve practicality.

[0018] 4. The water curtain dust collector for pyrolysis tail gas reduces pipeline connections and facilitates the recycling of water resources through the integrated structure of the water storage tank. Attached Figure Description

[0019] Figure 1 The diagram shown is a schematic representation of the overall structure of this utility model.

[0020] Figure 2 The diagram shown is a schematic representation of the internal structure of the dust collector box of this utility model.

[0021] Figure 3 The diagram shown is a cross-sectional view of the present invention.

[0022] Figure 4 The diagram shown is a structural schematic of the high-pressure water pump of this utility model.

[0023] Figure 5 The diagram shown is a schematic representation of the internal structure of the rotating shaft of this utility model.

[0024] Figure 6 The diagram shown is a structural schematic of another embodiment of the drive component of this utility model.

[0025] Explanation of reference numerals in the attached drawings: 1. Water storage tank; 101. Drive motor; 2. Air inlet box; 3. Dust removal box; 31. Exhaust port; 4. Divider plate; 5. Air inlet; 6. Rotating shaft; 61. Guide plate; 62. Branch pipe; 63. Nozzle; 7. Rotary joint; 71. High-pressure water pump. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-6In this embodiment, the water curtain dust collector for pyrolysis tail gas includes a water storage tank 1 and an air inlet box 2 fixedly installed on the top of the water storage tank 1. A dust collector box 3 is fixedly installed on one side of the air inlet box 2. Two partition plates 4 are alternately fixedly connected to the inner wall of the water storage tank 1. An air inlet 5 is provided on the top of the air inlet box 2, and an exhaust port 31 is provided on the side of the lower end face of the dust collector box 3. Both the exhaust port 31 and the air inlet 5 are equipped with inductive sensors. The inductive sensors are used to detect the pressure changes in the two ports. (The inductive sensor and the microprocessor form a differential pressure transmitter, which can automatically adjust the motor speed based on the differential pressure difference monitored by the differential pressure transmitter.) (The differential pressure transmitter and motor are connected and controlled using conventional technologies), and the left end of the dust collector 3 is connected to the air inlet box 2. The dust collector 3 is equipped with a rotating shaft 6, which is a hollow structure. One end of the rotating shaft 6 extends to the outside of the air inlet box 2 and is equipped with a drive assembly. The drive assembly is used to drive the rotating shaft 6 to rotate. The other end of the rotating shaft 6 extends to the outside of the dust collector 3 and is equipped with a rotary joint 7. The surface of the rotating shaft 6 is equipped with a water curtain assembly. When the rotating shaft 6 rotates, the water curtain assembly sprays water and forms a water mist network inside the dust collector 3. A water circulation assembly is provided between the rotary joint 7 and the water storage tank 1.

[0028] In this embodiment, two dividing plates 4 divide the two ends of the water storage tank 1 into a sedimentation zone and a purification zone. The two dividing plates 4 and the inner wall of the water storage tank 1 enclose a filtration zone. The bottom of the air inlet box 2 is connected to the top of the sedimentation zone. A filtration zone is formed between the two dividing plates 4, thereby adding a filter adsorption element (activated carbon adsorption filter) to adsorb and treat oil stains in the sewage.

[0029] It should be noted that the exhaust gas enters the intake box 2 through the intake port 5 and is then discharged from the exhaust port 31. In the dust removal box 3, the exhaust gas comes into contact with the water body through the water curtain component to achieve dust removal. Meanwhile, the sewage flows from the bottom of the dust removal box into the intake box 2 and flows back to the water storage tank 1. After the sewage settles in the sedimentation zone, impurities and particles are removed. The clean water enters the clean water zone for easy recycling. The bottom of the dust removal box 3 and the bottom of the sedimentation zone are both sloping surfaces. The slope of the dust removal box 3 guides the sewage into the intake box 2, while the slope of the sedimentation zone is adapted to the sewage outlet.

[0030] Please see Figure 2 and Figure 3 , Figure 5 In this embodiment, the two ends of the rotating shaft 6 are rotatably connected to the inner walls of the air inlet box 2 and the dust removal box 3, respectively. The hollow cavity of the rotating shaft 6 is a water passage cavity to provide a channel for the water circuit, and the surface of the rotating shaft 6 is provided with a turbulence component on the inner side of the air inlet box 2.

[0031] The turbulence assembly includes a guide plate 61 fixedly mounted on the surface of the rotating shaft 6. The guide plate 61 has a spiral structure. When the guide plate 61 rotates, it guides the exhaust gas to form a stable spiral downward trajectory.

[0032] In this embodiment, the drive assembly includes a drive motor 101 fixedly installed on the surface of the water storage tank 1. The output end of the drive motor 101 is fixedly connected to a transmission wheel, and one end of the rotating shaft 6 is equipped with the same transmission wheel. The two transmission wheels are connected by a belt drive, and the drive motor 101 is used to drive the rotating shaft 6 to rotate.

[0033] It should be noted that the drive motor 101 is a variable frequency speed control motor (model YVP-90L-4), which can dynamically adjust the speed through the differential pressure transmitter signal. The drive motor 101 drives the rotating shaft 6 to rotate through the transmission, so that when the exhaust gas enters, the guide plate 61 guides the exhaust gas to form a spiral flow, increasing the residence time of the exhaust gas.

[0034] Please see Figure 6 Based on another embodiment of the drive component in this embodiment, the drive motor 101 is a servo motor. The servo motor is directly connected to the planetary gear reducer, and the output shaft of the reducer is directly fixed to the extension end of the rotating shaft 6 through a rigid coupling (material 45 steel, keyway connection). The servo motor has a built-in absolute encoder (17-bit resolution) that is linked with the differential pressure transmitter signal, supports position closed-loop control and real-time speed feedback, has higher overall transmission efficiency, and is maintenance-free, making it suitable for high dust concentration working conditions.

[0035] Please see Figure 3 and Figure 5 In this embodiment, the water curtain assembly includes a branch pipe 62 fixedly installed on the surface of the rotating shaft 6. Multiple nozzles 63 are distributed in a ring array on the surface of the branch pipe 62, and the mouths of the nozzles 63 are all facing the vertical center line of the rotating shaft 6.

[0036] It should be noted that the nozzle 63 is internally embedded with a SiC ceramic core, and the inner wall of the cylinder is coated with a polytetrafluoroethylene coating (200μm thick) to reduce particulate matter adhesion. In addition, the nozzle 63 and the branch pipe 62 are detachably connected through the nozzle interface for easy replacement.

[0037] In this embodiment, the water circulation component includes a high-pressure water pump 71 fixedly installed on the surface of the water storage tank 1. The input end of the high-pressure water pump 71 is connected to the clean water area, and the output end of the high-pressure water pump 71 is connected to the rotary joint 7 through a pipeline. The high-pressure water pump 71 is used to pressurize water and send it into the hollow cavity of the rotating shaft 6.

[0038] It should be noted that the high-pressure water pump 71 draws clean water and sends it into the rotating shaft 6 to achieve water supply. The clean water is sprayed out through multiple nozzles 63 and forms secondary atomization after impacting the inner wall of the dust collector 3. All nozzles 63 face the same direction, forming a dense water mist network at the convergence point. After impact and reflection, a three-dimensional network is formed, resulting in better contact with the exhaust gas. The system can be adjusted according to changes in the exhaust gas volume to ensure sufficient contact. The high-pressure water pump 71 is frequency-controlled (such as the Delixi frequency conversion model) to ensure the density of the water mist. At the same time, the rotary joint 7 adopts a double-end mechanical seal structure (silicon carbide) to prevent high-pressure water leakage from affecting the operation of the equipment.

[0039] The working principle of the above embodiments is as follows:

[0040] The pyrolysis exhaust gas enters the intake box 2 through the intake port 5 (the high-temperature pyrolysis exhaust gas needs to be heat-treated by a finned cooler to reduce the exhaust gas temperature to below 80℃). The drive assembly drives the rotating shaft 6 to rotate, so that the incoming exhaust gas is guided to form a stable spiral downward trajectory when it comes into contact with the guide plate 61, increasing the exhaust gas residence time. The exhaust gas is purified when it passes through the water curtain assembly and is discharged from the exhaust port. The clean water is pressurized by the high-pressure water pump 71 (0.4-0.6MPa) and enters the hollow water passage cavity of the rotating shaft 6 through the rotary joint 7, and then flows to the branch pipe 62 on the surface. The annular array nozzles 63 on the branch pipe 62 (with the mouth facing the axis) are activated by centrifugal force and water pressure. Downward, water mist with a particle size of 50-100μm is sprayed out, forming a three-dimensional water mist network covering the cross-section of the dust collector 3. The spiraling exhaust gas collides fully with the water mist network, and particulate matter (dust, oil, etc.) is captured by the mist droplets, forming dust-laden droplets. Under the action of gravity, the dust-laden droplets slide down along the inner wall of the dust collector 3 and enter the sedimentation zone of the water storage tank 1. After sedimentation and filtration, the wastewater is purified and enters the purification zone for recycling. At the same time, the inductive sensors at the air inlet 5 and the exhaust outlet 31 monitor the pressure difference in real time. The microprocessor (differential pressure transmitter) dynamically adjusts the speed of the drive motor. When the pressure difference is large (such as when the dust concentration increases), the motor speed increases, which increases the water mist density, thereby ensuring the dust removal and purification capacity.

[0041] It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by a person skilled in the art through simple programming. The power supply is also common knowledge in the art. Furthermore, this utility model is mainly used to protect mechanical devices. Therefore, this utility model will not explain the control method and circuit connection in detail. At the same time, the maintenance of the mechanical structure in this application is common knowledge.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water curtain dust collector for pyrolysis tail gas, comprising a water storage tank (1), characterized in that: It also includes an air intake box (2) fixedly installed on the top of the water storage tank (1), a dust collector box (3) fixedly installed on one side of the air intake box (2), two partition plates (4) are fixedly connected to the inner wall of the water storage tank (1) in an alternating manner, an air inlet (5) is provided on the top of the air intake box (2), and the left end of the dust collector box (3) is connected to the air intake box (2), a rotating shaft (6) is provided inside the dust collector box (3), the rotating shaft (6) is a hollow structure, and a drive is installed on the water storage tank (1). The component has one end of a rotating shaft (6) connected to the output end of a drive component. The drive component is used to drive the rotating shaft (6) to rotate. The other end of the rotating shaft (6) extends to the outside of the dust collector (3) and is provided with a rotary joint (7). A water curtain component is provided on the surface of the rotating shaft (6). When the rotating shaft (6) rotates, the water curtain component sprays water and forms a water mist network inside the dust collector (3). A water circulation component is provided between the rotary joint (7) and the water storage tank (1).

2. The water curtain dust collector for pyrolysis tail gas according to claim 1, characterized in that: Two dividing plates (4) divide the two ends of the water storage tank (1) into a sedimentation zone and a water purification zone, while the two dividing plates (4) and the inner wall of the water storage tank (1) enclose a filtration zone, and the bottom of the air inlet box (2) is connected to the top of the sedimentation zone.

3. The water curtain dust collector for pyrolysis tail gas according to claim 2, characterized in that: The two ends of the rotating shaft (6) are rotatably connected to the inner walls of the air inlet box (2) and the dust removal box (3), respectively. The hollow cavity of the rotating shaft (6) is a water passage cavity to provide a channel for the water circuit, and the surface of the rotating shaft (6) is provided with a turbulence component on the inner side of the air inlet box (2).

4. The water curtain dust collector for pyrolysis tail gas according to claim 1, characterized in that: The turbulence assembly includes a guide plate (61) fixedly mounted on the surface of the rotating shaft (6). The guide plate (61) has a spiral structure. When the guide plate (61) rotates, it guides the exhaust gas to form a stable spiral downward trajectory.

5. The water curtain dust collector for pyrolysis tail gas according to claim 1, characterized in that: The drive assembly includes a drive motor (101) fixedly mounted on the surface of the water tank (1) and a transmission wheel mounted on the output end of the drive motor (101). Another transmission wheel is mounted on one end of the rotating shaft (6). The two transmission wheels are connected by a belt drive. The drive motor (101) drives the rotating shaft (6) to rotate by the belt drive.

6. The water curtain dust collector for pyrolysis tail gas according to claim 1, characterized in that: The water curtain assembly includes a branch pipe (62) fixedly installed on the surface of the rotating shaft (6). Multiple nozzles (63) are arranged in a ring array on the surface of the branch pipe (62), and the mouths of the nozzles (63) are all facing the vertical center line of the rotating shaft (6).

7. The water curtain dust collector for pyrolysis tail gas according to claim 1, characterized in that: The water circulation assembly includes a high-pressure water pump (71) fixedly installed on the surface of the water storage tank (1). The input end of the high-pressure water pump (71) is connected to the clean water area. The output end of the high-pressure water pump (71) is connected to the rotary joint (7) through a pipeline. The high-pressure water pump (71) is used to pressurize water and send it into the hollow cavity of the rotating shaft (6).

8. The water curtain dust collector for pyrolysis tail gas according to claim 1, characterized in that: An exhaust port (31) is provided on the side of the lower end face of the dust collector (3). An inductive sensor is provided in both the exhaust port (31) and the air inlet (5). The inductive sensor is used to detect the pressure change in the two ports.

Images