JPH0468018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fluidized bed apparatus for drying, granulating, coating, incinerating, etc. processing objects such as powder and granules containing moisture and organic matter. This invention relates to a device for discharging objects to be processed.

Conventional technology The conventional method for discharging the processed material from the fluidized bed is as follows:
Generally employed are an overflow method, a column wall discharge method, a fluidized bed lower extraction method, and a method in which the processing material storage section is separated from the column body.

The present invention was invented to improve the lower fluidized bed extraction method, and as shown in FIGS. 1 and 2, this fluidized bed device has a conical discharge valve. 1, a cylinder 2 for moving the discharge valve 1 up and down, a cylinder cover 3, a chute 4 for guiding the discharge of the material to be treated, and a large number of holes for passing hot air to uniformly flow the material to be treated. It is composed of a current plate 6 made of a perforated plate or a wire mesh, and a current plate reinforcing ring 7 for reinforcing the current plate.

When discharging the material to be processed, the discharge valve 1 is pulled down by the cylinder 2 and the rectifying plate 6
The central part of the apparatus is opened, and the material to be processed falls down the discharge chute 4 and is discharged from the discharge port 5 to the outside of the apparatus.

Problems to be Solved by the Invention As can be seen from FIGS. 1 and 2, there is no hot air blowing out from the discharge valve 1 and its surroundings, so it is difficult to discharge the material to be treated so that it does not stagnate on the discharge valve 1. Valve 1
To deal with this problem, the shape is changed to a conical shape. However, as mentioned above, the current plate 6 is usually made of a wire mesh or a perforated plate, and the thickness of the plate is several times the maximum.
mm, so a rectifying plate reinforcing ring 7 is required to reinforce the rectifying plate 6 at the contact area between the rectifying plate 6 and the discharge valve 1 (portion that becomes the valve seat). For this reason, the width L of the rectifying plate reinforcing ring 7 is required to be several tens of millimeters in terms of strength, and the hot air is no longer blown out from this portion, which impedes the proper flow of the material to be treated.

In addition, if the hot air temperature is high, the current plate 6 may become distorted or the object to be processed may be caught in the discharge valve 1.
A gap 8 is created between the current plate and the current plate reinforcing ring 7, and the material to be treated falls during operation of the device, causing variations in the drying, granulation, coating, etc. of the material to be treated, and the heat resistance of the cylinder 2. It also has the problem of causing problems in terms of sexuality.

The present invention has been made with attention to the above-mentioned points, and makes it possible to blow out hot air from the discharge valve and its surroundings to ensure proper flow of the material to be processed, and also allows the material to be processed to flow even during the operation of the device. An object of the present invention is to provide a fluidized bed apparatus which prevents the liquid from falling and prevents variations in drying and the like.

Means for Solving the Problems According to the present invention, the above problems can be solved by using a perforated plate as the discharge valve, providing a damper for blowing hot air in the middle of the discharge chute leading to the discharge valve, and discharging the hot air during operation of the device. This problem can be solved by blowing hot air from the blowing damper to the discharge valve side via the discharge chute, and by blocking the blowing of air to the discharge chute when the material to be treated is discharged.

Embodiments Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 3 shows a fluidized bed apparatus 20 according to the present invention. The fluidized bed apparatus 20 includes an upper layer 21 for fluidizing and drying a material to be processed, such as powder or granules, and an upper layer 21 for drying, etc., by blowing hot air into the fluidized bed apparatus 20. It consists of a lower layer 22 from which the objects to be processed are discharged. A rectifying plate 23 made of a wire mesh or a perforated plate is installed between the upper layer 21 and the lower layer 22 in a slightly inclined state so as to be concave toward the center. This angle of inclination is 2
An angle of 6 degrees to 6 degrees is preferred.

As shown in detail in FIG. 4, a cylindrical discharge valve body 24 is fixedly attached to the center of the baffle plate 23 by welding or the like.

A large number of holes 25, 25 are provided in the upper part of the discharge valve body 24.
A discharge valve 26 consisting of a perforated plate having a diameter is located therein. As shown in FIG. 5, a shaft 27 is fixed at the center of the lower end surface of the discharge valve 26 by welding or bolting, and the rotation of the shaft 27 rotates the discharge valve 26, allowing the discharge valve body 24 to open and close freely. There is. Axis 2
7 extends to the outside of the device 20, and a handle 28 is attached to the tip of the handle 28. When the handle 28 is operated, the shaft 27 is rotated and the discharge valve 26 is opened and closed.

A discharge chute 29 for guiding the processed material out of the apparatus 20 is attached to the lower part of the discharge valve body 24, and a valve 31 is provided at the discharge port 30.

A damper 32 for blowing hot air is provided in the middle of the discharge chute 29, and the hot air from the hot air blowing port 10 passes through the damper 32 for blowing hot air and passes through the discharge chute 29, the discharge valve body 24, and the discharge valve 26. The liquid is blown into the upper layer 21.
33 is a damper valve that opens and closes the damper 32 for blowing hot air.

In this embodiment, the discharge valve 26 is made of a perforated plate and is configured to open and close at 90 degrees around the shaft 27, so that the plate thickness l of the discharge valve body 24 can be made as thin as 10 mm or less. A uniform fluidized bed of the material to be processed can be formed.

Furthermore, even if a slight gap 34 is generated between the discharge valve 26 and the discharge valve body 24 due to thermal distortion, thermal expansion, powder encroachment, etc., the hot air can pass through the discharge valve body 24 and reach the upper layer 21. Therefore, the material to be treated does not fall into the discharge port 30.

Furthermore, the damper valve 3 of the hot air blowing damper 32
Similarly to the opening/closing mechanism of the discharge valve 26, the valves 31 of the discharge ports 30 and 30 are rotated about their shafts, so that the valves 31 of the discharge ports 30
1 and 33 can be opened and closed.

Reference numeral 9 denotes an input port into which a material to be processed such as powder or granular material is input. Reference numeral 11 is an exhaust port for exhausting hot air, and is designed to adjust the pressure within the fluidized bed, which is the upper layer 21, due to the hot air.

Operation Next, the operation of the fluidized bed apparatus 20 according to the present invention will be explained.

First, hot air is blown in from the hot air blowing port 10. The blown hot air is blown into the upper layer 21 through a large number of holes provided in the current plate 23, and the damper valve 33 of the hot air blowing damper 32 is opened, and the valve 31 provided at the discharge port 30 is opened. By being in the closed state, hot air is blown into the upper layer 21 through the hot air blowing damper 32, the exhaust chute 29, and the holes 25, 25 of the exhaust valve 26. Next, the material to be processed, such as powder or granular material, is introduced into the upper layer 21 through the input port 9. Since hot air is blown not only from the current plate 23 but also from the discharge valve 26, a uniform fluidized bed of the material to be treated is formed, and even if gaps 34 etc. occur, the hot air is blown into the upper layer 21. Since the air is blown up, the material to be treated does not leak from the gap 34 to the discharge port 30.

When discharging the material to be treated, operate the handle 28 to open the discharge valve 26 vertically as shown in FIG. 6, open the valve 31 of the discharge port 30, and discharge the upper layer from the discharge chute 29. 21 and the discharge port 30, and the current plate 2
By closing the damper valve 33 of the hot air blowing damper 32, the material to be processed is removed from the discharge port 30 so that the material to be processed can easily fall into the discharge chute 29 without obstructing the flow of the material on the top 3. Discharge. Therefore, it is possible to easily open and close the discharge valve 26 and the damper valve 33 of the hot air blowing damper 32 outside the device 20.

Effects of the Invention As described above, according to the present invention, the discharge valve is made of a perforated plate having a large number of holes, and hot air can also be blown from the discharge chute. Compared to blowing, a uniform fluidized bed of the processed material is formed, and the processed material does not leak to the discharge port during equipment operation, preventing variations in drying, granulation, coating, etc. of the processed material. It is possible to make the product uniform. In addition, since the discharge valve and the damper valve of the hot air blowing damper are rotary, they can be easily operated outside the apparatus. Therefore, in the discharge mechanism of the fluidized bed apparatus, it is possible to easily design the heat distortion for hot air, the heat resistance of the thermally expanded intestine, the operating part, etc.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional fluidized bed apparatus,
FIG. 2 is an enlarged sectional view of the part in FIG. 1, FIG. 3 is a partial sectional view of the fluidized bed apparatus according to the present invention,
Fig. 4 is an enlarged cross-sectional view of the part shown in Fig. 3, Fig. 5 is a cross-sectional view showing the relationship between the discharge valve and the shaft in detail, and Fig. 6 is a cross-sectional view showing the discharge valve in its open state. be. 20: Fluidized bed device, 21: Upper layer, 22: Lower layer, 23: Current plate, 25: Hole, 26: Discharge valve, 2
9: Discharge chute, 32: Hot air blowing damper, 3
3: Damper valve.

Claims (1)

[Claims] 1. A fluidized bed device in which a rectifying plate 23 provided between an upper layer 21 and a lower layer 22 is slightly inclined so that the center is depressed, and a discharge valve is provided at the center of the rectifying plate 23. In this, the discharge valve 26 is made of a perforated plate having a large number of holes 25, 25, and a hot air blowing damper 32 having a damper valve 33 is provided in the middle of the discharge chute 29 leading to the discharge valve 26, and the hot air blowing damper 32 is provided during the operation of the device. A fluidized bed apparatus characterized in that hot air is also blown from the hot air blowing damper 32 to the exhaust valve 26 side via the exhaust chute 29, and the air blowing to the exhaust chute 29 can be cut off at the time of exhaustion.