Fluidized bed tail gas powder selecting device

Abstract

A fluidized bed tail gas powder selecting device is characterized in that the powder selecting device is arranged in an exhaust pipe at the top of a fluidized bed body, and the powder selecting device comprises an upper circular plate, a lower circular plate and a cylindrical filter screen arranged between the upper circular plate and the lower circular plate; a plurality of air passing holes are annularly formed in the upper circular plate, and the distance from the air passing holes to the circle center of the upper circular plate is larger than the diameter of the cylindrical filter screen; an opening through which tail gas passes is formed in the middle of the lower circular plate; the diameter of the opening is not greater than that of the cylindrical filter screen. By the adoption of the structure, product particles in drying tail gas of the fluidized bed can be recycled, product loss is reduced, and waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a fluidized bed tail gas powder selection device. Background Art

[0002] Fluidized bed equipment is required in the production process of aminosulfonic acid. The fluidized bed is mainly used to dry the aminosulfonic acid with hot air during operation. The exhaust gas generated by drying will be sent to the water foam dust collector by the induced draft fan for treatment, and the exhaust gas that meets the treatment requirements will be discharged into the atmosphere.

[0003] At present, the drying exhaust gas generated by fluidized bed drying operations contains a certain amount of aminosulfonic acid particles. These aminosulfonic acid particles will be carried into the water foam dust collector along with the high-speed airflow. Some larger particles that meet the factory quality requirements are also carried away by the exhaust gas and finally decomposed by water, resulting in waste. If this part of the product can be recovered, the product yield will be greatly improved and production losses will be reduced. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a fluidized bed tail gas powder selection device, which can recover product particles in the fluidized bed drying tail gas, reduce product loss and avoid waste.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a fluidized bed tail gas powder selection device, the powder selection device is arranged in the exhaust pipe on the top of the fluidized bed body, and the powder selection device includes an upper circular plate, a lower circular plate and a cylindrical filter screen arranged between the upper circular plate and the lower circular plate;

[0006] The upper circular plate is provided with a plurality of air holes in an annular direction, and the distance between the plurality of air holes and the center of the upper circular plate is greater than the diameter of the cylindrical filter screen;

[0007] An opening is provided in the middle of the lower circular plate for the exhaust gas to pass through, and the diameter of the opening is not greater than the diameter of the cylindrical filter screen.

[0008] In a preferred solution, a vertical drive shaft is provided inside the cylindrical filter screen, a frame plate is provided on the drive shaft, and a filter screen plate is provided in the middle of the frame plate.

[0009] In a preferred solution, a motor is provided on the top of the upper circular plate, and the output shaft of the motor passes downward through the center of the upper circular plate and is connected to the shaft between the drive shafts.

[0010] In a preferred solution, bristles are provided on the outer side of the vertical side of the frame away from the drive shaft, and the bristles are in contact with the inner wall of the cylindrical filter screen.

[0011] In a preferred solution, the diameter of the upper circular plate is larger than that of the lower circular plate, and a limiting step is provided on the inner wall of the exhaust pipe. The upper circular plate is placed on the limiting step to fix the powder selection device in the exhaust pipe;

[0012] The diameter of the lower circular plate is the same as the inner diameter of the exhaust pipe, and the lower circular plate fits tightly against the inner wall of the exhaust pipe.

[0013] In a preferred solution, a sealing ring is provided on the outer circular surface of the lower circular plate, and the sealing ring is interference fit with the inner wall of the exhaust pipe to achieve sealing of the gap between the lower circular plate and the exhaust pipe.

[0014] The fluidized bed tail gas powder selection device provided by the utility model has the following beneficial effects by adopting the above structure:

[0015] (1) By installing a powder selection device in the exhaust pipe at the top of the fluidized bed, larger aminosulfonic acid particles that meet the factory quality requirements can be effectively separated from the tail gas, preventing these valuable particles from being discharged into the water foam dust collector along with the tail gas, thereby reducing product waste and improving the overall product recovery rate;

[0016] (2) The frame plate and filter screen plate installed inside the powder selection device can be rotated under the drive of the motor. The bristles on the edge of the frame plate contact the inner wall of the cylindrical filter screen, which can continuously clean the particles accumulated on the filter screen during operation to prevent blockage and ensure the long-term stable operation of the device;

[0017] (3) After the drying operation is completed, the large particles adhering to the filter plate can be recovered by simply starting the motor for reverse motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 Schematic diagram of the overall structure of the fluidized bed equipped with a powder selection device.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model.

[0021] Figure 3 This is a schematic diagram of the elevation structure of the present utility model.

[0022] In the figure: fluidized bed 1, exhaust pipe 2, powder selection device 3, cylindrical filter 4, upper circular plate 5, lower circular plate 6, sealing ring 601, air hole 7, motor 8, drive shaft 801, opening 9, frame plate 10, filter plate 11, and brush 12. DETAILED DESCRIPTION

[0023] like Figure 1-3 In the embodiment, a fluidized bed tail gas powder selection device is provided, wherein the powder selection device 3 is provided in the exhaust pipe 2 at the top of the fluidized bed body 1, and the powder selection device 3 comprises an upper circular plate 5, a lower circular plate 6, and a cylindrical filter screen 4 provided between the upper circular plate 5 and the lower circular plate 6;

[0024] The upper circular plate 5 is provided with a plurality of air holes 7 in an annular direction, and the distance between the plurality of air holes 7 and the center of the upper circular plate 5 is greater than the diameter of the cylindrical filter 4;

[0025] An opening 9 for the exhaust gas to pass through is provided in the middle of the lower circular plate 6 , and the diameter of the opening 9 is not larger than the diameter of the cylindrical filter screen 4 .

[0026] In a preferred embodiment, a vertical drive shaft 801 is provided inside the cylindrical filter screen 4 , a frame plate 10 is provided on the drive shaft 801 , and a filter screen plate 11 is provided in the middle of the frame plate 10 .

[0027] In a preferred solution, a motor 8 is provided on the top of the upper circular plate 5 , and the output shaft of the motor 8 passes downward through the center of the upper circular plate 5 and is axially connected to the drive shaft 801 .

[0028] In a preferred solution, bristles 12 are provided on the outer side of the vertical side of the frame plate 10 away from the driving shaft 801 , and the bristles 12 are in contact with the inner wall of the cylindrical filter screen 4 .

[0029] In the preferred embodiment, the diameter of the upper circular plate 5 is larger than that of the lower circular plate 6. A limiting step is provided on the inner wall of the exhaust pipe 2. The upper circular plate 5 is placed on the limiting step to fix the powder selection device 3 in the exhaust pipe 2.

[0030] The diameter of the lower circular plate 6 is the same as the inner diameter of the exhaust pipe 2 , and the lower circular plate 6 fits tightly against the inner wall of the exhaust pipe 2 .

[0031] In a preferred solution, a sealing ring 601 is provided on the outer surface of the lower circular plate 6 , and the sealing ring 601 is interference fit with the inner wall of the exhaust pipe 2 to achieve sealing of the gap between the lower circular plate 6 and the exhaust pipe 2 .

[0032] The fluidized bed tail gas powder separation device disclosed in this invention is used for drying aminosulfonic acid:

[0033] The aminosulfonic acid product is fed into the feed port of the fluidized bed 1. During the process, air is simultaneously introduced into the side air ports of the fluidized bed 1 to dry the aminosulfonic acid in the fluidized bed 1. The waste gas generated by the drying is discharged through the exhaust pipe 2 at the top of the fluidized bed.

[0034] During the above process, the drying exhaust gas entering the exhaust pipe 2 carries the aminosulfonic acid particles and enters the cylindrical filter 4 through the opening 9 on the lower circular plate 6. The motor 8 continuously drives the frame plate 10 and the filter plate 11 on the frame plate 10 to capture the large particles of aminosulfonic acid in the exhaust gas. The small particles that do not meet the factory requirements pass through the cylindrical filter 4 horizontally with the exhaust gas and pass upward through the air holes 7 on the upper circular plate 5, and are then sent to the water foam dust collector for treatment.

[0035] During the above process, the continuously rotating frame plate 10 can capture large particles of aminosulfonic acid in the exhaust gas on the one hand, and on the other hand, it can change the direction of the exhaust gas, so that the upward exhaust gas flows to both sides, slowing down the exhaust gas flow speed and ensuring the filtering effect.

[0036] Considering that during the continuous exhaust gas output, large particles of aminosulfonic acid are affected by the rising exhaust gas and cannot be effectively recovered, after the subsequent drying operation is completed or the exhaust gas flow rate is reduced, the motor 8 rotates in the reverse direction to allow the large particles of aminosulfonic acid to fall off the filter plate 11. In the case of a slow exhaust gas flow rate, the motor 8 can also be controlled to use intermittent forward and reverse rotation to achieve simultaneous recovery of large particles of aminosulfonic acid and exhaust gas discharge.

Claims

1. A fluidized bed tail gas powder selection device, characterized by: The powder selection device (3) is arranged in the exhaust pipe (2) at the top of the fluidized bed (1), and the powder selection device (3) includes an upper circular plate (5), a lower circular plate (6), and a cylindrical filter screen (4) arranged between the upper circular plate (5) and the lower circular plate (6); The upper circular plate (5) is provided with a plurality of air holes (7) in an annular direction, and the distance between the plurality of air holes (7) and the center of the upper circular plate (5) is greater than the diameter of the cylindrical filter screen (4); An opening (9) for the exhaust gas to pass through is provided in the middle of the lower circular plate (6), and the diameter of the opening (9) is no larger than the diameter of the cylindrical filter screen (4).

2. The fluidized bed tail gas powder separation device according to claim 1, characterized in that: A vertical drive shaft (801) is provided inside the cylindrical filter screen (4), a frame plate (10) is provided on the drive shaft (801), and a filter screen plate (11) is provided in the middle of the frame plate (10).

3. The fluidized bed tail gas powder separation device according to claim 2, characterized in that: A motor (8) is provided on the top of the upper circular plate (5), and an output shaft of the motor (8) passes downward through the center of the upper circular plate (5) and is axially connected to the drive shaft (801).

4. The fluidized bed tail gas powder separation device according to claim 2, characterized in that: Brushes (12) are provided on the outer side of the vertical edge of the frame plate (10) away from the drive shaft (801), and the brushes (12) are in contact with the inner wall of the cylindrical filter screen (4).

5. The fluidized bed tail gas powder separation device according to claim 1, characterized in that: The diameter of the upper circular plate (5) is larger than that of the lower circular plate (6), and a limiting step is provided on the inner wall of the exhaust pipe (2). The upper circular plate (5) is placed on the limiting step to achieve the fixation of the powder selection device (3) in the exhaust pipe (2); The diameter of the lower circular plate (6) is the same as the inner diameter of the exhaust pipe (2), and the lower circular plate (6) fits tightly against the inner wall of the exhaust pipe (2).

6. A fluidized bed tail gas powder separation device according to claim 1 or 5, characterized in that: A sealing ring (601) is provided on the outer circular surface of the lower circular plate (6), and an interference fit is formed between the sealing ring (601) and the inner wall of the exhaust pipe (2), thereby sealing the gap between the lower circular plate (6) and the exhaust pipe (2).

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