JPS58114722A - Powder discharging method in fluidized treating chamber - Google Patents

Abstract

PURPOSE:To discharge powder thoroughly from the inside of a fluidized treating tank by introducing a pressurized gas into a treating chamber through a gas diffusing plate, and ejecting the pressurized gas from agitating vanes in the treating chamber while rotating said vanes thereby fluidizing the powder. CONSTITUTION:A prescribed pressurized gas is supplied through a gas supply pipeline 6 into a pressure chamber 5, and is diffused uniformity with a gas diffusing plate 2 so as to be admitted into a treating chamber 3 and to fluidize powder 8. The powder is treated by maintaining the same at prescribed temp. In discharging the powder 8 after the treatment, a plug body 9 closing a discharge pipeline 7 is removed. In this stage, the powder 8 is fluidized by the pressurized gas from the pipeline 6 and while a agitating vanes 4 are rotated with a prime mover 10, the pressurized gas of the same kind as that of said pressurized gas from a gas supply pipeline 12 is ejected from the vanes 4 through a hollow shaft 11. Then, the entire amt. of the powder 8 in the chamber 3 is fluidized and is fed forcibly into the pipeline 7 opened to the plate 2 through which the powder is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for discharging powder in a fluidization treatment tank.

Various treatments such as drying and reduction of powder have traditionally been carried out using a fluidization treatment tank, but in order to prevent residual powder from being generated when the powder is discharged from the tank after treatment. , a method of supplying pressurized gas to a pressure chamber configured below a gas distribution plate to fluidize the powder and feeding it into a discharge pipe opened in the distribution plate, or a method above the distribution plate. Various methods have been tried, such as a method in which powder is stirred by rotating a stirring blade in a processing chamber configured as described above and then fed into the discharge pipe.

However, in any of these methods, the powder could not be completely discharged, and a certain amount of residual powder had to be ignored.

In other words, in the case of using the pressurized gas supply method described above, when the amount of residual powder gradually decreases, the gas partially blows through, making it impossible to completely exhaust the remaining part and not reducing the amount of gas supplied too much. However, when the amount of waste gas increases, powder is carried along with the gas, making it difficult to treat the exhaust gas.

Furthermore, in the case of using the above-mentioned stirring blade rotation method, although it is possible to discharge the powder present in and around the area where the blade is rotating, it is not possible to discharge the powder present in other areas. There were drawbacks.

For safety reasons, it is not possible to place the blade too close to the gas distribution plate, so a skirt made of a flexible material such as a rubber material is attached to the blade, and the skirt part is used to rub the top surface of the gas distribution plate. Attempts have been made to discharge the powder in this way, but even in this case, it is not possible to completely discharge the powder present at the corner formed by the gas distribution plate and the inner wall of the tank, and Adding a section to the material impedes uniform fluidization of the powder during processing, and there is a possibility that foreign gas may be generated from the material during processing, so it cannot be used in a wide range of applications.

The above-mentioned residual powder in the fluidization treatment tank is particularly important when processing powders with poor fluidization properties, or when processing powders that change to poor fluidization properties upon processing. This is noticeable in some cases.

The present invention was invented in view of the shortcomings of the conventional methods, and its purpose is to provide a method that can completely discharge powder from the fluidization treatment tank. be.

A method for discharging powder in a fluidization treatment tank according to the present invention that achieves this objective includes supplying pressurized gas to a pressure chamber configured below a gas distribution plate and configured above the distribution plate. The powder in the processing chamber is introduced into the processing chamber, and a stirring blade disposed in the processing chamber is rotated, and pressurized gas is ejected from the blade to fluidize the powder in the processing chamber while discharging the powder through the dispersion plate. It is characterized by forcibly feeding it into the pipe.

Hereinafter, the present invention will be described in detail based on an example. In FIG. 1, a fluidization treatment tank is divided into two upper and lower chambers by fixing a gas distribution plate (21) inside a cylindrical tank body (1). , a stirring blade +41 is arranged in the processing chamber (3) above it, a gas supply pipe (6) is opened in the pressure chamber (5) below it, and a discharge pipe (6) is arranged in the gas distribution plate (2). 7) is opened.The powder (8) to be treated is supplied into the processing chamber (3) from the upper part of the tank body (1) via a pipe line (not shown).

During processing, the pressure chamber +5 from the gas supply pipe (6)
1 is supplied with a predetermined pressurized gas, or various gases are appropriately selected depending on the processing purpose, such as air gas, inert gas, etc. Then, in the processing chamber, the powder (8) in 3) is uniformly dispersed by the gas distribution plate (2) and fluidized by the gas flowing into the processing chamber (3), and is heated or cooled by heating means (not shown). It is maintained at a predetermined temperature by a means for processing.

After treatment, to discharge this powder (8), the discharge pipe (
7) is removed.

At this time, the powder (8) is fluidized by the pressurized gas supplied from the gas supply pipe (6) to the pressure chamber (5), and the stirring blade (4) rotated by the prime mover (II)
The same type of pressurized gas as the pressurized gas is ejected from this stirring l114+.

As the detailed structure of the stirring blade (4) is shown in Fig. 2,
A branch pipe body (4a) fixed to the lower end of a hollow shaft an which is rotationally driven by the prime mover '11 (l), and a short pipe body (4b) fixed at an inclination (angle of inclination θ=3°) to the branch pipe body (4a). The pressurized gas flowing through the hollow shaft at+ is ejected from a group of nozzle holes (4C) bored in the short pipe body (4b) via the branch pipe body (4a). The pressurized gas is supplied into the hollow shaft aD through the gas supply pipe (1
It is carried out from 2. As shown in the detailed structure in Part A, the hollow shaft aU and the gas supply pipe a are engaged via a shaft sealing mechanism composed of a ground backing a3, a casing aΦ, etc. Since the supply pipe α2 is screwed and the hole α9 is bored in the hollow shaft, pressurized gas can be supplied from the pipe 03 into the rotating hollow shaft aD.

Therefore, the powder (8) in the processing chamber (3) is
Pressurized gas passing through 1 and stirring 1! The entire amount is fluidized by the stirring by tf41 and the pressurized gas ejected from this blade (41), and is forcibly sent to the discharge pipe (7) opened to the gas distribution plate (2) and discharged. be done.

That is, most of the powder (8) is fluidized by the pressurized gas flowing into the processing chamber (3) from below the gas distribution plate (2), but the powder that is not fluidized is The powder is fluidized by the pressurized gas injected from 4), and at this time, the fluidization is promoted by stirring by the stirring blade (4), and the powder is completely discharged without generating any residual powder. I can do it.

In addition, in the present invention, the stirring blade (4) and the gas distribution plate (2
) It is preferable to make the gap as small as possible, but generally it is sufficient if it is 1 (about 111 to 50 m).
It is preferable to make the gap between +41 and the inner wall of the tank as small as possible, but in general, the gap should be between 10 and 2011. The stirring blade (4) may be rotated in one direction or in the opposite direction in a constant or random cycle, or the stirring blade may be provided so as to be able to move up and down.

In addition, the number and shape of the blades, the number of nozzle holes, etc. are selected as appropriate.

Preferably, the nozzle holes are provided so that the pressurized gas can be sprayed onto the gas distribution plate, and it is also preferable if the nozzle holes are provided so that the pressurized gas can also be sprayed onto the inner wall of the tank.

It is preferable that the gas distribution plate be provided inclined toward the discharge port as shown in FIG. 1, but it is not limited thereto, and may be provided horizontally.

In the fluidization treatment tank shown in FIG.
Pressurized air of 0.2 Kg/cyj was supplied from the gas supply pipe (6) at 45 Nrd/Hr, and at the same time, the stirring blade (4
) was rotated at 100 r and pm, and 0.5 squares of pressurized air was blown out from the blade (4) at 8 Nnf/Hr to remove the plug (9) and discharge the alumina particles. I was able to completely drain it.

In addition, when pressurized air was not blown out from the rotating tool (4), tSW remained.

Also, do not rotate the tool (4) and
1 3.2 when pressurized air is not blown out
It remained immediately.

As described above, according to the present invention, a method is provided in which powder can be completely discharged from the fluidization treatment tank.

[Brief explanation of drawings]

Figure 1 shows the schematic structure of the fluidization treatment tank, Figure 2 shows the stirring @
Detailed view of 141, Figure 3 shows the hollow shaft on and gas supply pipe a
FIG. 2 is a detailed view of the engaging portion with . (2): Gas distribution plate, (31: Processing chamber (4): Stirring blade, +51: Pressure chamber +61, a2: Gas supply pipe, +71: Discharge pipe Fig. 1)

Claims (1)

[Claims] (1) Pressurized gas is supplied to a pressure chamber configured below the gas distribution plate and introduced into the processing chamber configured above the distribution plate, and a stirring blade disposed within the processing chamber. The fluidization processing tank is characterized in that the powder in the processing chamber is fluidized by rotating and jetting pressurized gas from the blades, while forcibly feeding the powder into a discharge pipe opened in the dispersion plate. powder discharge method.