A bag type dust collecting device for producing slag powder

Abstract

This utility model discloses a baghouse dust collection device for slag powder production, including a housing and an inlet pipe. The housing is divided into a dust collection chamber and a dust storage chamber by an inclined plate. The dust collection chamber is further divided into an outer cyclone dust collection chamber, a filtration dust collection chamber, an inner cyclone dust collection chamber, and a baghouse dust collection chamber by multiple vertical cylinders from the outside in. The inlet pipe is tangentially connected to the upper part of the outer cyclone dust collection chamber. Multiple connecting holes are evenly distributed around the circumference of the lower part of the vertical cylinder between the outer cyclone dust collection chamber and the filtration dust collection chamber, and the lower part of the vertical cylinder between the inner cyclone dust collection chamber and the baghouse dust collection chamber. A connecting pipe is tangentially installed at the upper part of the vertical cylinder between the filtration dust collection chamber and the inner cyclone dust collection chamber. An annular filter screen is installed in the filtration dust collection chamber. A partition is installed in the baghouse dust collection chamber, and baghouse dust collection components are installed on the partition. An exhaust pipe is installed at the top of the baghouse dust collection chamber. In summary, this utility model has the advantages of durable filter bags, high dust collection efficiency, and uniform airflow distribution within the device.

Description

Technical Field

[0001] This utility model relates to the technical field of bag dust collection equipment for slag powder production, specifically to a bag dust collection device for slag powder production. Background Technology

[0002] Slag powder, also known as granulated blast furnace slag powder, refers to the powder produced during the ironmaking process. This powder is made by granulating blast furnace slag through water quenching, followed by drying and grinding to achieve a certain fineness. The production process mainly includes a grinding system. The finely ground slag powder mixes with airflow and enters a baghouse dust collector, also called a finished product collector, located at the end of the production line. When the airflow rich in finished slag powder passes through the filter bags of the dust collector, the dust is trapped on the outer surface of the filter bags, and the purified gas is discharged. The collected slag powder that meets the quality requirements is the final product, which is then sent to the finished product warehouse for packaging via an unloading system. It is evident that the baghouse dust collector plays a crucial role in product recovery, which is its most unique and important function in the slag powder production line, distinguishing it from its simple purification function in other industries.

[0003] Baghouse dust collectors often face the following problems in the production of slag powder: First, unlike other industries where they are simply used for purification, slag powder forms a mixture with the airflow, with a concentration reaching over 600 g / m³, or even higher. This excessive workload causes rapid wear and tear on the filter bags, drastically shortening their lifespan and leading to frequent replacement and maintenance, thus reducing the dust collection efficiency. Second, uneven airflow distribution within the device causes flow deviation. On one hand, some filter bags are subjected to prolonged concentrated airflow, resulting in damage occurring in a fixed location while other parts of the bags remain undamaged. On the other hand, some filter bags operate under high loads while others do not function effectively. Therefore, developing a baghouse dust collector for slag powder production that features durable filter bags, high dust collection efficiency, and uniform airflow distribution is objectively necessary. Utility Model Content

[0004] The purpose of this utility model is to provide a bag dust collection device for slag powder production that features filter bags that are not easily damaged, high dust collection efficiency, and uniform airflow distribution within the device.

[0005] The purpose of this utility model is achieved as follows: It includes a housing and an air inlet pipe. The housing is divided into a dust collection chamber and a dust storage chamber by an inclined plate. The dust collection chamber is further divided into an outer cyclone dust collection chamber, a filtration dust collection chamber, an inner cyclone dust collection chamber, and a bag filter chamber by multiple vertical cylinders from the outside to the inside. Each chamber has a ash discharge pipe connected to the dust storage chamber at the lower end of the inclined plate at the bottom. The air inlet pipe is tangentially connected to the upper part of the outer cyclone dust collection chamber. Multiple connecting holes are evenly distributed around the circumference of the lower part of the vertical cylinder between the outer cyclone dust collection chamber and the filtration dust collection chamber, and between the inner cyclone dust collection chamber and the bag filter chamber. A connecting pipe is tangentially installed at the upper part of the vertical cylinder between the filtration dust collection chamber and the inner cyclone dust collection chamber. An annular filter screen is installed in the filtration dust collection chamber. A partition is installed in the bag filter chamber, and a bag filter assembly is installed on the partition. An exhaust pipe is installed at the top of the bag filter chamber.

[0006] Furthermore, a main air pipe is vertically and concentrically arranged inside the bag filter chamber below the bag filter assembly. Both ends of the main air pipe are sealed. Multiple air distribution pipes are evenly distributed around the upper circumference of the main air pipe. Several air outlets are spaced along the length of the air distribution pipes. A conveying pipe is installed on the connecting hole at the bottom of the vertical cylinder between the inner cyclone dust collector chamber and the bag filter chamber. The conveying pipe is connected to the main air pipe.

[0007] Furthermore, a motor is installed on the inclined plate at the bottom of the bag filter chamber. The output shaft of the motor extends into the bag filter chamber and is connected to the lower end of the upper air main pipe. A sleeve with both ends sealed is fitted on the upper air main pipe. The sleeve and the upper air main pipe are connected in a sealed rotatable manner. A vent hole is provided on the upper air main pipe inside the sleeve. The conveying pipe is connected to the sleeve.

[0008] Furthermore, each filter bag in the bag filter assembly is equipped with a protective plate underneath, and the protective plates are connected to each other and to the side wall of the bag filter chamber by several connecting rods.

[0009] Furthermore, the lower part of the outer cyclone dust removal chamber, the filter dust removal chamber, and the inner cyclone dust removal chamber are all equipped with annular baffles. The baffles are connected to the side walls of each chamber through connecting rods, and the cross-sectional shape of the baffles is an arc shape with a convex center and concave sides.

[0010] Furthermore, spiral water pipes are installed in the outer cyclone dust removal chamber, the filter dust removal chamber, and the inner cyclone dust removal chamber.

[0011] Furthermore, a ring pipe is installed in the dust removal chamber above the filter screen. Several air blowing ports are evenly distributed around the bottom circumference of the ring pipe, and the top of the ring pipe is connected to the exhaust pipe through a pipeline.

[0012] Furthermore, a vibrator is installed on the inclined plate.

[0013] In operation, the airflow formed by the mixture of slag powder and gas enters the outer cyclone dust removal chamber tangentially from the inlet pipe. A vortex is formed within the outer cyclone dust removal chamber, where centrifugal force removes some of the larger slag powder particles. The airflow then enters the filtration dust removal chamber from the bottom, flowing upwards. As it passes through the filter screen, some of the larger slag powder particles are filtered out. The airflow continues upwards through the filter screen and then tangentially enters the inner cyclone dust removal chamber from the upper connecting pipe. A vortex is formed within the inner cyclone dust removal chamber, where centrifugal force again removes the larger slag powder particles. The airflow then flows downwards within the inner cyclone dust removal chamber and finally enters the bag filter chamber through multiple connecting holes at the bottom. The bag filter assembly filters the airflow, removing the remaining slag powder. Clean gas is discharged from the exhaust pipe, while the slag powder separated from the airflow falls into the dust storage chamber through the ash discharge pipes at the bottom of each chamber and is periodically removed. In this invention, before entering the bag filter chamber, the airflow sequentially passes through the outer cyclone dust collection chamber, the filtration dust collection chamber, and the inner cyclone dust collection chamber. The airflow undergoes two cyclone dust collection processes and one filtration dust collection process, thereby removing most of the slag powder from the airflow. This pre-dust collection treatment of the slag powder significantly reduces the workload of the bag filter components, especially the filter bags, slowing down their wear rate, extending their service life, and reducing the frequency of replacement and maintenance. This allows the device to operate normally for extended periods, improving its dust collection efficiency. Secondly, after passing through the cyclone and filtration dust collection processes, most of the slag powder is removed from the airflow. The airflow then enters the bag filter chamber through various connecting holes, distributing the airflow evenly throughout the chamber. This prevents flow deviation and avoids concentrated airflow impact on specific parts of the filter bags. The airflow can evenly contact all parts of the filter bags, averaging the workload on each part. This prevents some filter bags from being overloaded locally, extending their service life, and also avoids some filter bags not performing their intended function, thus improving the device's dust collection efficiency. In summary, this utility model has the advantages of filter bags that are not easily damaged, high dust collection efficiency, and uniform airflow distribution within the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 for Figure 1 A magnified structural diagram of node A in the middle;

[0016] In the diagram: 1-box body, 2-air inlet pipe, 3-sloping plate, 4-external cyclone dust removal chamber, 5-filtration dust removal chamber, 6-inner cyclone dust removal chamber, 7-bag dust removal chamber, 8-ash discharge pipe, 9-connecting hole, 10-filter screen, 11-bag dust removal assembly, 12-exhaust pipe, 13-dust storage chamber, 14-main air supply pipe, 15-air distribution pipe, 16-conveying pipe, 17-motor, 18-sleeve, 19-protective plate, 20-baffle plate, 21-spiral water pipe, 22-ring pipe, 23-vibrator. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0018] like Figures 1-2 As shown, this utility model includes a housing 1 and an air inlet pipe 2. A mixed airflow of slag powder and gas enters tangentially into the outer cyclone dust collector 4 through the air inlet pipe 2. The housing 1 is divided into a dust collection chamber and a dust storage chamber 13 by an inclined plate 3. The dust collection chamber is further divided into an outer cyclone dust collector 4, a filter dust collector 5, an inner cyclone dust collector 6, and a bag filter dust collector 7 by multiple vertical cylinders from the outside to the inside. Each chamber has a discharge pipe 8 at the lower end of the inclined plate 3, which communicates with the dust storage chamber 13. In actual production, to prevent airflow from directly entering the dust storage chamber 13 through the discharge pipe 8 and then spreading into other chambers, a solenoid valve can be installed on the discharge pipe 8 for periodic discharge. The air inlet pipe 2 connects to the outer cyclone dust collector 4. The upper part of the cyclone dust collection chamber 4 is tangentially connected. The lower part of the vertical cylinder between the outer cyclone dust collection chamber 4 and the filter dust collection chamber 5, and the lower part of the vertical cylinder between the inner cyclone dust collection chamber 6 and the bag dust collection chamber 7 are all circumferentially distributed with multiple connecting holes 9. The upper part of the vertical cylinder between the filter dust collection chamber 5 and the inner cyclone dust collection chamber 6 is tangentially connected with a connecting pipe. The filter dust collection chamber 5 is equipped with an annular filter screen 10. The bag dust collection chamber 7 is equipped with a partition, and a bag dust collection assembly 11 is installed on the partition. An exhaust pipe 12 is installed at the top of the bag dust collection chamber 7. The bag dust collection assembly 11 is the core filter component in the existing bag dust collector, which usually includes a bag cage and a filter bag installed on the bag cage. The bag cage is used to support the filter bag.

[0019] In operation, the airflow formed by the mixture of slag powder and gas enters the outer cyclone dust removal chamber 4 tangentially from the air inlet pipe 2. A vortex is formed within the outer cyclone dust removal chamber 4, and centrifugal force removes some of the larger slag powder particles. The airflow then enters the filtration dust removal chamber 5 from the bottom, flowing upwards. Upon passing through the filter screen 10, the filter screen 10 filters out some of the larger slag powder particles in the airflow. The airflow passing through the filter screen 10 continues to flow upwards and then tangentially enters the inner cyclone dust removal chamber from the upper connecting pipe. The dust chamber 6 forms a vortex within the inner cyclone dust removal chamber 6, and once again uses centrifugal force to remove large particles of slag powder from the airflow. The airflow flows downward within the inner cyclone dust removal chamber 6 and finally enters the bag filter chamber 7 through multiple connecting holes 9 at the bottom. The bag filter assembly 11 filters the airflow to remove the remaining slag powder. The clean gas is discharged from the exhaust pipe 12, while the slag powder separated from the airflow falls into the dust storage chamber 13 from the ash discharge pipe 8 at the bottom of each chamber and can be discharged periodically.

[0020] In this invention, before entering the bag filter chamber 7, the airflow sequentially passes through the outer cyclone dust collection chamber 4, the filtration dust collection chamber 5, and the inner cyclone dust collection chamber 6. The airflow undergoes two cyclone dust collection processes and one filtration dust collection process, thereby removing most of the slag powder from the airflow. This achieves pre-dust collection of the slag powder, significantly reducing the workload of the bag filter assembly 11, especially the workload of the filter bags, lowering the wear rate of the filter bags, extending their service life, and reducing the frequency of filter bag replacement and maintenance. This allows the device to operate normally for extended periods, improving efficiency and performance. The dust collection efficiency of the device is improved. Secondly, after the airflow passes through the cyclone dust collector and filter dust collector, most of the slag powder in the airflow is removed. The airflow enters the bag filter chamber 7 through the various connecting holes 9. The airflow is distributed in various parts of the bag filter chamber 7 to avoid the phenomenon of flow deviation and prevent the filter bag from being scoured by concentrated airflow in some areas. The airflow can evenly contact various parts of the filter bag, and average the working load of each part of the filter bag. This can prevent some filter bags from being overloaded locally, extend the service life of the filter bags, and avoid the problem of some filter bags not fully playing their role, thereby improving the dust collection efficiency of the device.

[0021] A main air pipe 14 is vertically and concentrically arranged inside the bag filter chamber 7 below the bag filter assembly 11. Both ends of the main air pipe 14 are sealed. Multiple air distribution pipes 15 are evenly distributed around the upper circumference of the main air pipe 14. Several air outlets are spaced along the length of each air distribution pipe 15. A conveying pipe 16 is installed on the connecting hole 9 at the bottom of the vertical cylinder between the inner cyclone dust collector chamber 6 and the bag filter chamber 7. The conveying pipe 16 is connected to the main air pipe 14. During operation, the airflow enters the main air pipe 14 through the conveying pipe 16, then enters the air distribution pipes 15, and finally exits from the air outlets. This improves the uniformity of airflow distribution, thereby increasing the dust collection efficiency of the bag filter assembly 11.

[0022] A motor 17 is installed on the inclined plate 3 at the bottom of the bag filter chamber 7. The output shaft of the motor 17 extends into the bag filter chamber 7 and connects to the lower end of the upper air main pipe 14. A sleeve 18 with both ends sealed is fitted onto the upper air main pipe 14. The sleeve 18 and the upper air main pipe 14 are rotatably connected in a sealed manner. The upper air main pipe 14 inside the sleeve 18 is provided with a vent hole, and the conveying pipe 16 is connected to the sleeve 18. In use, the motor 17 drives the upper air main pipe 14 to rotate, and the upper air main pipe 14 drives the air distribution pipe 15 to rotate. The airflow enters the sleeve 18 from the conveying pipe 16 and then enters the upper air main pipe 14 through the vent hole. This arrangement keeps the air distribution pipe 15 in a rotating state, which allows the airflow to be more evenly distributed to all parts of the bag filter chamber 7, making the airflow distribution more uniform and improving the dust collection efficiency of the bag filter assembly 11.

[0023] Each filter bag in the bag filter assembly 11 is provided with a protective plate 19 below it. The protective plates 19 are connected to each other and to the side wall of the bag filter chamber 7 by several connecting rods. Since the airflow flows from bottom to top in the bag filter chamber 7, it often directly impacts the bottom of the filter bag in the bag filter assembly 11, which causes the bottom of the filter bag to be damaged first compared to other parts, reducing the service life of the filter bag. The protective plate 19 can effectively prevent the airflow from directly impacting the bottom of the filter bag, thereby extending the service life of the filter bag.

[0024] The lower part of the outer cyclone dust removal chamber 4, the filter dust removal chamber 5, and the inner cyclone dust removal chamber 6 are all equipped with annular baffles 20. The baffles 20 are connected to the side walls of each chamber by connecting rods. The cross-sectional shape of the baffles 20 is an arc shape with a convex upper part in the middle and concave lower parts on both sides. The mixed airflow undergoes pre-dust collection treatment in the outer cyclone dust removal chamber 4, the filter dust removal chamber 5, and the inner cyclone dust removal chamber 6. Most of the slag powder falls to the bottom of each chamber. In actual production, it was found that when the airflow flows downward, due to the fineness of the slag powder, the falling slag powder is easily swept up by the airflow, forming secondary dust and reducing the dust collection efficiency. However, after setting up the baffles 20, the airflow can be blocked, minimizing the contact between the airflow and the accumulated slag powder, and avoiding the generation of secondary dust as much as possible.

[0025] Spiral water pipes 21 are installed in the outer cyclone dust removal chamber 4, the filter dust removal chamber 5, and the inner cyclone dust removal chamber 6. When the device is running, cooling water is introduced into the spiral water pipes 21. When the mixed airflow enters the device, it will come into contact with the spiral water pipes 21 in each chamber. The cooling water in the spiral water pipes 21 absorbs the heat in the airflow and reduces the airflow temperature. The gaseous water in the mixed airflow condenses and adheres to the slag powder, which plays two roles: first, it removes the moisture in the mixed airflow to prevent moisture from causing bag clogging and other problems in subsequent bag dust collection; second, when the moisture condenses and adheres to the slag powder, it can increase the weight of the slag powder, making it easier for the slag powder to be separated from the airflow and improving the separation efficiency.

[0026] A ring pipe 22 is installed in the dust removal chamber 5 above the filter screen 10. Several air blowing ports are evenly distributed around the bottom circumference of the ring pipe 22. The top of the ring pipe 22 is connected to the exhaust pipe 12 through a pipeline. The gas that has removed the slag powder is discharged from the exhaust pipe 12. Some of the gas is transported to the ring pipe 22 through the pipeline and then sprayed from the air blowing ports onto the filter screen 10, thereby blowing off the slag powder adhering to the filter screen 10, which has the function of backflushing cleaning.

[0027] A vibrator 23 is installed on the inclined plate 3. The vibrator 23 is an existing device used to generate vibration. In this utility model, the vibration generated by the vibrator 23 is transmitted to the inclined plate 3 and various parts of the device. The slag powder falling onto the inclined plate 3 moves continuously towards the lower end of the inclined plate 3 under the action of gravity and vibration, which promotes the slag powder to be discharged from the ash discharge pipe 8 at the bottom of each chamber. This prevents the slag powder from accumulating at the bottom of each chamber and clogging it. At the same time, the vibration can also prevent the slag powder from clogging in the ash discharge pipe 8. In addition, when the vibration is transmitted to the filter screen 10, it can also shake off the slag powder adhering to the filter screen 10, ensuring the long-term normal operation of the filter screen 10.

Claims

1. A baghouse dust collection device for slag powder production, comprising a housing (1) and an air inlet pipe (2), characterized in that: The housing (1) is divided into a dust collection chamber and a dust storage chamber (13) by an inclined plate (3). The dust collection chamber is divided into an outer cyclone dust collection chamber (4), a filter dust collection chamber (5), an inner cyclone dust collection chamber (6), and a bag filter dust collection chamber (7) by multiple vertical cylinders from the outside to the inside. Each chamber has a ash discharge pipe (8) at the lower end of the inclined plate (3) at the bottom, which is connected to the dust storage chamber (13). The air inlet pipe (2) is tangentially connected to the upper part of the outer cyclone dust collection chamber (4). The outer cyclone dust collection chamber (4) is connected to the filter dust collection chamber. Multiple connecting holes (9) are evenly distributed around the lower part of the vertical cylinder between (5) and between the inner cyclone dust removal chamber (6) and the bag dust removal chamber (7). A connecting pipe is tangentially arranged on the upper part of the vertical cylinder between the filter dust removal chamber (5) and the inner cyclone dust removal chamber (6). An annular filter screen (10) is provided in the filter dust removal chamber (5). A partition is provided in the bag dust removal chamber (7). A bag dust removal assembly (11) is provided on the partition. An exhaust pipe (12) is provided on the top of the bag dust removal chamber (7).

2. The baghouse dust collection device for slag powder production according to claim 1, characterized in that: A main air pipe (14) is vertically and concentrically arranged in the bag dust collection chamber (7) below the bag dust collection assembly (11). Both ends of the main air pipe (14) are sealed. Multiple air distribution pipes (15) are evenly distributed around the upper circumference of the main air pipe (14). Several air outlet holes are spaced along the length of the air distribution pipes (15). A conveying pipe (16) is provided on the connecting hole (9) at the bottom of the vertical cylinder between the inner cyclone dust collection chamber (6) and the bag dust collection chamber (7). The conveying pipe (16) is connected to the main air pipe (14).

3. The baghouse dust collection device for slag powder production according to claim 2, characterized in that: A motor (17) is installed on the inclined plate (3) at the bottom of the bag dust collector (7). The output shaft of the motor (17) extends into the bag dust collector (7) and is connected to the lower end of the upper air main pipe (14). A sleeve (18) with both ends sealed is fitted on the upper air main pipe (14). The sleeve (18) and the upper air main pipe (14) are connected in a sealed rotational manner. A ventilation hole is provided on the upper air main pipe (14) inside the sleeve (18). The conveying pipe (16) is connected to the sleeve (18).

4. A baghouse dust collection device for slag powder production according to claim 1, characterized in that: Each filter bag in the bag filter assembly (11) is provided with a protective plate (19) below it. The protective plates (19) are connected to each other and to the side wall of the bag filter chamber (7) by several connecting rods.

5. A baghouse dust collection device for slag powder production according to claim 1, characterized in that: The lower part of the outer cyclone dust removal chamber (4), the filter dust removal chamber (5) and the inner cyclone dust removal chamber (6) are all provided with annular baffles (20). The baffles (20) are connected to the side walls of each chamber through connecting rods. The cross-sectional shape of the baffles (20) is an arc shape with a convex center and concave sides.

6. A baghouse dust collection device for slag powder production according to claim 1, characterized in that: Spiral water pipes (21) are installed in the outer cyclone dust removal chamber (4), the filter dust removal chamber (5), and the inner cyclone dust removal chamber (6).

7. A baghouse dust collection device for slag powder production according to claim 1, characterized in that: A ring pipe (22) is provided in the dust removal chamber (5) above the filter screen (10). Several air blowing ports are evenly distributed around the bottom circumference of the ring pipe (22). The top of the ring pipe (22) is connected to the exhaust pipe (12) through a pipeline.

8. A baghouse dust collection device for slag powder production according to claim 1, characterized in that: A vibrator (23) is installed on the inclined plate (3).

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