JPH0427552Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a heat exchange device for powder and granular materials in which cyclone separators are vertically stacked, and in particular, the present invention relates to a heat exchange device for powder and granular materials in which cyclone separators are stacked vertically. The present invention relates to a heat exchange device for powder and granular material that can prevent sudden changes in the amount of powder and granular material supplied to a lower cyclone separator even if there is a sudden change in the amount of powder and granular material.

[Prior art]

FIGS. 2 to 4 show an example of a heat exchange device for powder and granular materials, which is the background of the present invention.

As shown in Fig. 2, a heat exchange device used in a conventional powder heating device, etc. has cyclone separators 1 and 11 stacked vertically, each having a cylindrical upper part and an inverted conical lower part. It is configured. Inverted L-shaped introduction ducts 5 and 15 are connected to the upper side of the cylindrical portion of the cyclone separators 1 and 11, respectively. Furthermore, discharge ducts 7 and 17 and powder discharge chutes 8 and 18 are connected to the upper and lower central portions of the cyclone separators 1 and 11, respectively.

The introduction duct 5 of the upper cyclone separator 1 and the discharge duct 17 of the lower cyclone separator 11 are connected. Further, the powder discharge chute 8 of the upper cyclone separator 1 and the powder supply chute 16 attached to the introduction duct 15 of the lower cyclone separator 11 are connected via a weight type damper 8 _a . .

As shown in FIG. 3, the damper _8a has a damper casing 20 integrally connected to the upper end of the powder supply chute 16 to the cyclone separator 11 below. The lower end of the powder discharge chute 8 of the upper cyclone separator 1 is inserted into the central portion directly above the damper casing 20 . And, on the side surface of the damper casing 20,
A rotating shaft 22 fixed to the damper plate 23 is rotatably supported by bearings 21, 21.

A weight 25 is attached to one end of the rotating shaft 22 via a lever 24 so that its position and weight can be adjusted. The weight of the weight 25 forces the damper plate 23 to swing in a direction to close the tip opening 26 of the powder discharge chute 8 located at the upper cyclone separator. The white arrow indicates the flow of powder and granules.
Black arrows indicate gas flow.

Therefore, the gas introduced into the introduction duct 15 to the lower cyclone separator 11 of the heat exchanger shown in FIG. into the inlet duct 5, the cyclone separator 1 and the outlet duct 7.

On the other hand, the powder and granular material supplied from the powder supply chute 6 to the introduction duct 5 to the upper cyclone separator 1 rides on the airflow rising inside the introduction duct 5, and passes through the upper cyclone separator while exchanging heat. 1.

The powder and granular material introduced into the cyclone separator 1 is subjected to centrifugal force by a strong swirling airflow formed within the cyclone separator 1, and is separated from the airflow. The granular material is then discharged to a granular material discharge chute 8 connected to the lower part of the cyclone separator 1. Further, the airflow after separating most of the powder and granules rises to the discharge duct 7 and is discharged.

The powder separated by the cyclone separator 1 is deposited on the damper plate 23 in the weight type damper _8a . Then, the damper plate 23 is slightly swung downward so that the rotational torque due to the accumulated weight of the granular material is balanced with the rotational torque due to the weight of the weight 25, and the opening at the tip of the granular material discharge chute 8 is opened. 26 and the tip of the damper plate 23 is slightly opened. In this state, the powder and granular material is transferred to the weight type damper 8.
It is continuously discharged from _a . At this time, the weight type damper _8a allows a part of the airflow from the introduction duct 15 of the lower cyclone separator 11 to the upper cyclone separator 1 to pass through the powder supply chute 16 and the powder discharge chute 8. It acts to prevent short-circuiting and rising.

The powder and granules discharged from the weight damper _8a in this way are further disposed in the cyclone separator 1 below.
1 and is supplied to the inlet duct 15, where heat exchange is similarly performed with the gas. Thereafter, the granular material is separated by a cyclone separator 11, and taken out through a granular material discharge chute 18 connected to the lower part of the cyclone separator 11.

[The problem that the idea aims to solve]

In such a conventional heat exchange device for powder and granular materials, even if powder and granular materials are continuously and stably supplied to the upper cyclone separator 1, pulsations in the airflow flowing inside the heat exchange device and pulsation in the heat exchange device occur. The amount of powder discharged from the cyclone separator 1 may lose continuous stability due to fluctuations in the residence time of the powder or the like.

In this case, a sudden change occurs in the amount of powder deposited on the damper plate 23, and the damper plate 23 violently swings up and down. As a result, fluctuations in the amount of powder discharged from the upper cyclone separator 1 to the powder discharge chute 8 are amplified by the damper _8a . As a result, a large fluctuation occurs in the amount of powder and granular material supplied to the lower cyclone separator 11,
The operating condition of the entire heat exchange device becomes unstable.

In this way, even if the amount of powder and granules supplied to the upper cyclone separator 1 is continuously stable, if the amount of powder and granules discharged fluctuates when discharging the powder and granules from the upper cyclone separator 1, the lower cyclone separator 1 The amount of powder and granular material supplied to the separator 11 varies considerably due to the operation characteristics of the weight type damper _8a . As a result, heat exchange between the powder and the air stream is no longer carried out continuously and stably, resulting in a decrease in heat exchange efficiency and variations in product quality of the heat-treated powder and granules.

Therefore, the main objective of the present invention is to improve the quantitative stability of the powder and granular material fed from the upper cyclone separator to the lower cyclone separator.

[Means to solve the problem]

The main means adopted by the present invention to achieve the above object is to stack the cyclone separators vertically, connect the discharge duct of the lower cyclone separator to the introduction duct of the upper cyclone separator, and In a heat exchange device for powder and granule, the powder and granule discharge chute of the cyclone separator is connected to the powder and granule supply chute attached to the introduction duct of the lower cyclone separator via a weight damper, This heat exchange device for powder and granular materials is characterized in that the weight type damper is equipped with a buffer for suppressing rapid movement of the damper plate.

[Effect]

When the amount of granular material discharged from the upper cyclone separator fluctuates and temporarily increases, the amount of granular material deposited on the damper plate rapidly increases. However, since the rapid movement of the damper plate is suppressed by the buffer, fluctuations in the amount of powder and granular material discharged are attenuated, and the powder and granular material is stably supplied to the cyclone separator below.

〔Example〕

FIG. 1 shows a side sectional view of a weight type damper used in an embodiment of the present invention. Hereinafter, the same reference numerals will be used for the same elements as those of the conventional powder heat exchange apparatus shown in FIGS. 2 to 4, and the description thereof will be omitted.

This embodiment differs from the conventional heat exchange device in that a shock absorber 30 is attached to the weight type damper _8b . The buffer 30 is an air cylinder 3
4 and a throttle valve 38.

The lower end of the air cylinder 34 is connected by a pin 37 to a bracket 32 provided on the upper surface of a support base 31 fixed to the powder supply chute 16.
Further, at the upper end of this air cylinder 34, a piston rod 35 is connected by a pin 36 to a lever 24 that is integrated with the damper plate 23. Incidentally, an air port 39 above the air cylinder 34 is provided with a throttle valve 38 whose opening degree can be adjusted.

In the heat exchange device configured as described above, when the amount of powder and granular material discharged from the upper cyclone separator 1 fluctuates rapidly and increases temporarily, the amount of powder and granular material deposited on the damper plate 23 of the weight type damper 8 _b increases rapidly.
When the rotational torque due to the amount of powder exceeds the rotational torque due to the weight 25, the damper plate 23 is biased in the opening direction.

As mentioned above, the air cylinder 34 that acts as a rotational resistance is connected to the rotating shaft 22 of the damper plate 23, so the action of this air cylinder 34 suppresses the rapid opening and closing movement of the damper plate 23, so that the damper plate 23 opens slowly. . At this time, the operating characteristics of the damper plate 23 can be adjusted by adjusting the opening of the throttle valve 38 attached to the air cylinder 34. In this way, the granular material can be uniformized and supplied to the cyclone separator 11 below. In addition, throttle valve 3
8 may be provided at either or both of the air ports 39 located above and below the air cylinder 34.

[Effect of idea]

In conventional powder heat exchange equipment, when the amount of powder discharged from the upper cyclone separator fluctuates, the amount of powder supplied to the lower cyclone separator further changes depending on the operating characteristics of the weight damper. However, according to the present invention, the shock absorber suppresses the rapid vibration of the damper plate, so even if the amount of powder and granular material discharged from the cyclone separator above fluctuates rapidly, Powder can be stably supplied to the cyclone separator below.

Therefore, the operating condition of the lower cyclone separator is stabilized, and the amount and temperature of the airflow flowing from the lower cyclone separator to the upper cyclone separator are stabilized, so that the operating condition of the upper cyclone separator is also stabilized. Stabilize. Furthermore, since continuous and stable heat exchange is performed, heat exchange efficiency is increased, and the product quality of heat-treated powder and granules is also improved.

[Brief explanation of the drawing]

FIG. 1 shows a side sectional view of a weight type damper used in an embodiment of the present invention. 2 to 4 show a conventional heat exchange device for powder and granular materials, which is the background of the present invention. FIG. 2 is a schematic side view of the conventional device, and FIG. A side sectional view of the weight type damper, FIG. 4 is a view taken along arrow A in FIG. 3. Explanation of symbols, 1...Upper cyclone separator,
5,15...Introduction duct, 6,16...Powder supply chute, 7,17...Discharge duct, 8,18
... Powder discharge chute, 8 _a , 8 _b ... Weight type damper, 11 ... Lower cyclone separator, 30
...buffer, 34...air cylinder, 38...throttle valve, 39...air port.

Claims (1)

[Scope of Claim for Utility Model Registration] 1 Cyclone separators are stacked vertically, and the discharge duct of the lower cyclone separator is connected to the introduction duct of the upper cyclone separator,
In a heat exchange device for powder and granule, which connects a powder discharge chute of an upper cyclone separator and a powder supply chute attached to an introduction duct of a lower cyclone separator via a weight damper. . A heat exchange device for powder and granular materials, characterized in that the weight type damper is equipped with a buffer for suppressing rapid movement of the damper plate. 2. The powder heat exchange device according to claim 1, wherein the buffer comprises an air cylinder and a throttle valve provided at an air port of the air cylinder and whose opening can be adjusted.