JPS59176571A - Multistage fluidizing drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a multistage fluidized fluidized drying device for powder and granular materials.

A vertical multi-stage fluidized drying apparatus has been proposed in which powder and granules are fluidized with hot air to form a fluidized bed and sequentially transferred to the lower stage (for example, Japanese Patent Publication No. 49-86934 or Japanese Patent Publication No. 51-46).
517), when transferring powder to the lower fluidization chamber, the fluidized bed may become unstable due to gas blow-through, and in some cases, the fluidized bed may not be formed. There are problems such as inability to adjust or control.

Although solutions to these problems have been proposed in the prior art, they are not practically sufficient due to friction with the movable plate or damper plate and communication between the upper and lower stages.

The present invention provides two methods that do not substantially simultaneously open the bottom surface of each fluidized bed.
By vertically installing retention and transfer chambers with on-off valves and interlocking the upper and lower on-off valves at predetermined timings, it is possible to prevent blow-through of the upper and lower flow chambers when transferring powder and granules to the lower flow chamber, and to prevent blow-through of the upper and lower flow chambers, and to prevent blow-through of the upper and lower flow chambers, and to prevent blow-through of the upper and lower flow chambers and to prevent blow-through of the upper and lower flow chambers by interlocking the upper and lower on-off valves at predetermined timings. The purpose of the present invention is to provide a drying device that can control the height of the dryer, improve thermal efficiency, and operate stably.

To explain the configuration of the device of the present invention with reference to the drawings, (1) is a drying oven, (2) (3) (4) is a flow chamber, (5) (
6) (7) is a fluidized bed equipped with a perforated plate or a dispersion nozzle. (8) is hot air inlet, (9) is exhaust port,
The figure is the powder input valve, (E) is the overflow wall, and Q is the powder discharge pipe.

Ql) is a retention and transfer chamber installed vertically on the lower surface of each fluidized bed except for the lowest fluidized bed (7), and an opening (a) frame is provided at the upper part of the retention chamber, that is, at the fluidized bed surface and at the lower end, respectively. An on-off valve α4 (g) is provided in each opening.

The opening/closing valve α→(T) is vertically symmetrically attached to a single Rondo (G) so that the opening and closing operations are reversed and interlocked, and the Rondo is connected to a driving device such as a cylinder. The drive device is operated by the output of a timer that can set the opening and closing times of the valves, and the amount of discharge from each opening is determined by the ratio of the opening and closing time intervals.

This timer output is gated by the detection output of the level detector α of the fluidized bed. That is, it operates only when the level of the upper fluidized bed is above a set value, and introduces the powder on the upper fluidized bed into the retention chamber (b), and transfers the powder in the retention chamber to the lower fluidization base. Let it fall.

Note that the operation of the timer may be directly controlled by the output of the level detector.

As described above, the device of the present invention can quasi-continuously transfer powder and granules to the lower fluidized bed while maintaining the height of the fluidized bed in each stage, and this opening α◆ (g) is a reverse operation. Therefore, the upper and lower chambers are not substantially ventilated, and there is no risk of gas blowing through.

In the present invention, the amount of powder or granular material transferred is adjusted according to the volume of the retention chamber (b) and further by the ratio of the opening/closing time of the valve (L4).

Further, since the powder transfer capacity of the retention chamber can be adjusted by adjusting the opening area, the chimney angle of the valve body, the stroke of the valve body, etc., there is an advantage that the transfer amount can be controlled over a wide range.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of the apparatus of the present invention, and FIG. 2 is an enlarged sectional view of the retention and transfer chamber. (B) is the retention transfer chamber, (6) (to) is the opening, α4 (B)
is the on-off valve, α force is the drive device, and (to) is the timer. 21 Illustrated Figure 2 Procedural Amendment Letter May 26, 1980 Mr. Kazuo Wakasugi, Commissioner of the Patent Office■, Indication of Case 1982 Patent M No. 48709 2, Title of Invention Multistage Fluid Drying Apparatus 3, Person Making Amendment Case Relationship with Patent applicant address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Name
Denka Engineering Co., Ltd. Daifu Miya Take Shozo 4, Agent 5, Date of amendment order (line 6, number of inventions to be increased due to amendment N/A 7, field for detailed explanation of the invention in the specification subject to amendment) 8 , Contents of the amendment (1) In the fourth line from the bottom of the second page of the specification, before the word "in conjunction with", "Installation space 355-

Claims (2)

[Claims] (1) In a multistage fluidized drying device partitioned by a plurality of fluidized beds, a retention and transfer chamber is provided vertically below the bottom surface of each fluidized bed other than the lowest fluidized bed, and openings are provided in the upper and lower parts of the retention and transfer chamber. Each of the on-off valves is provided with an on-off valve, and the on-off valve is pivoted to a single iron driven by a drive device so that the opening and closing operations are opposite, and the drive device is controlled by the bed height detection method of each upper fluidized bed. A multistage fluidized fluidized drying device characterized in that it is operated by a timer output. (2) The multi-stage fluidized fluidized drying apparatus according to item 1 above, wherein the timer can arbitrarily set the time interval between the opening time and the closing time of the valve, and the amount of powder or granular material transferred can be adjusted according to the time ratio.