JP3191029B2 - Paddle in powder agitator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical powder stirrer suitably used for stirring fine powder having a high viscosity or containing a large amount of water. The new configuration of the paddle.

[0002] A powder stirrer of this kind is used, for example, as a thermal decomposition apparatus for removing harmful substance dioxin in fly ash discharged from incineration of refuse.

[0003]

2. Description of the Related Art As shown in FIG. 1, a powder stirrer used as a thermal decomposition apparatus for dioxin in fly ash is provided with a rotary valve for supplying fly ash at an upper end of a cylindrical shell (1). (8), a passage (9) for sending the decomposition product to the cooling device is provided below the other end, and a rotating shaft (2) driven by a motor (10) is provided at the axial center of the shell (1). )
A plurality of paddle holding pieces (3) are provided in a pair on the rotating shaft (2) in the radial direction, and a paddle (4) is provided over the tip of each pair of the holding pieces (3). The paddle (4) tip is the inner surface of the shell (1) or a fixed layer fixed to it.
It is configured to slide on the surface of (7).

As shown in FIG. 4, the conventional paddle (24) is composed of a rectangular bent plate having a rectangular cross section.

[0005]

Generally, in waste incineration, HCl in flue gas generated from an incinerator is used.
Slaked lime powder introduced into exhaust gas to remove gas is mixed in fly ash. When this slaked lime is heated to about 400 ° C in a pyrolysis device for removing dioxin in fly ash, water is separated and an immobile layer is formed between the inner surface of the shell (1) and the tip of the paddle (4). (7) is generated, which is pressed and fixed to the inner surface of the shell (1) by the paddle (4). Therefore, when the tip of the paddle (4) slides on the surface of the immobile layer (7), abnormal noise may be generated or the tip of the paddle (4) may be worn out.

The present invention has been made in view of the above circumstances, and has as its object to generate an abnormal sound due to the sliding of the paddle and to prevent the tip of the paddle from irrespective of the type of powder. An object of the present invention is to provide a paddle structure free from abrasion.

[0007]

SUMMARY OF THE INVENTION A paddle according to the present invention has been devised in order to achieve the above-mentioned object. The first one is that a rotary shaft is provided at an axial center in a horizontal cylindrical shell (1).
(2) is provided, a plurality of paddles holding piece in the radial direction (3) is provided on the rotary shaft (2), and the tip paddle (4) is provided in the same holding piece (3), fly ash Dioxin
In powder agitating machine used as a pyrolysis device, double
Number of paddle holding pieces (3) along the length of the rotating shaft (2)
They are arranged in pairs with regular intervals, and each pair is
The paddle extends in the opposite direction about the rotation shaft (2).
(4) is provided parallel to the tip of the paddle holding piece (3).
Bent from the radial part and the tip of the radial part
The paddle (4) has a sawtooth (5) at the tip of the paddle (4) .
And provided at the tip of the pair of paddle holding pieces (3)
Two paddles on opposite sides of the shaft (2)
Of (4), the sawtooth (5) of one paddle (4) and the other paddle
(4) means that the peak of the former corresponds to the valley of the latter.
It is characterized by being shifted from each other so as to correspond .

The second paddle has a horizontal cylindrical shell.
A rotary shaft (2) is provided at the axial center of (1), and a plurality of paddle holding pieces (3) are provided on the rotating shaft (2) in the radial direction. 4) is used as a thermal decomposition device for dioxin in fly ash.
In a powder stirrer which is, paddle (4) is paddle holding pieces
(3) Radial part provided parallel to the tip of
The slanted part that is bent obliquely from the tip of the radial part
The paddle (4) is provided with a brush (6) at the tip of the paddle (4).

[0009]

In the first paddle according to the present invention, the paddle is held.
A radial part and a parallel part provided at the tip of the piece (3)
From the tip of the radial part
Comprising transverse sectional dogleg-shaped paddles constituted by a rectangular bent plate (4)
The saw tooth (5) is provided at the tip of the
However, the paddle (4) slides on the surface of the immobile layer (7) with the rotation of the paddle (4), and the surface becomes uneven and uneven, so that the immobile layer (7) is easily peeled.

[0010] In the second paddle according to the present invention,
At the end of the paddle holding piece (3), a radio
It bends obliquely from the tip of the radial and radial parts
A brush (6) is provided at the tip of a paddle (4) composed of a rectangular bent plate having a rectangular cross section with an inclined portion .
This slides on the inner surface of the shell (1) with the rotation of the paddle (4), scraping off the immobile layer (7) and preventing the generation of the immobile layer (7).

[0011]

Next, the present invention will be described in detail with reference to examples.

Example 1 A powder stirrer used as an apparatus for thermally decomposing dioxin in fly ash is configured as shown in FIGS. That is, a rotary valve (8) for supplying fly ash is provided above one end of the cylindrical shell (1), and a passage (9) for sending decomposition products to the cooling device is provided below the other end. A rotary shaft (2) driven by a motor (10) is provided at an axis in the shell (1). Rotating shaft
In (2), a plurality of paddle holding pieces (3) are provided in the radial direction. The plurality of paddle holding pieces (3) are arranged so as to form a pair having a constant interval in the longitudinal direction of the shaft, and each pair extends in the opposite direction about the rotating shaft (2). Then, paddle over the tip of each pair of paddle holding pieces (3).
(4) is provided.

As shown in FIG. 2, the paddle (4) is formed of a rectangular bent plate having a rectangular cross section, and a sawtooth portion (5) is provided at its tip along its length. . The sawtooth (5) of one paddle (4) and the sawtooth (5) of the other paddle (4) around the rotating shaft (2) are such that the former peak corresponds to the latter valley. Offset from each other.

In the refuse incineration treatment, slaked lime powder introduced into the exhaust gas to remove HCl gas in the combustion exhaust gas generated from the incinerator is mixed in the fly ash. When this slaked lime is heated to about 400 ° C in a pyrolysis device for removing dioxin in fly ash, water is separated and an immobile layer is formed between the inner surface of the shell (1) and the tip of the paddle (4). (7) is generated, which is pressed and fixed to the inner surface of the shell (1) by the paddle (4).

The sawtooth portion (5) slides on the surface of the immobile layer (7) with the rotation of the paddle (4), and makes the surface an uneven uneven surface, and peels off the immobile layer (7). Make it easier.

Embodiment 2 In this embodiment, the paddle (4)
As shown in FIG. 3, it is also formed of a rectangular bent plate having a rectangular cross section, and a wire brush (6) is provided at the tip thereof along its length direction.

The other structure is the same as that of the first embodiment.

The wire brush (6) slides on the inner surface of the shell (1) with the rotation of the paddle (4), scraping off the immobile layer (7) and preventing the immobile layer (7) from being formed.

[0019]

Effects of the Invention According to a first paddle of the present invention, paddle
Radial provided parallel to the tip of the holding piece (3)
Bend obliquely from the tip of the section and radial section
The sawtooth part (5) provided at the tip of the paddle (4), which is composed of a rectangular bent plate with a rectangular cross section consisting of a part , slides the surface of the immobile layer (7) with the rotation of the paddle (4). By moving the surface, the surface becomes uneven and uneven, so that the immobile layer (7) can be easily peeled off.

According to the second paddle of the present invention,
At the end of the paddle holding piece (3), a radio
It bends obliquely from the tip of the radial and radial parts
A brush (6) provided at the tip of a paddle (4) consisting of a rectangular bent plate with a rectangular cross section consisting of an inclined portion is a paddle (4).
The inner surface of the shell (1) slides with the rotation of the
And the formation of the immobile layer (7) can be prevented. By preventing the formation of the immobile layer (7) as described above, when a heater or a cooler is provided on the outer peripheral surface of the shell (1), it is possible to prevent a decrease in heat transfer efficiency.

Further, as in the conventional example described above, the paddle
When the tip of (4) slides on the immobile layer (7), it is possible to eliminate the problem that an abnormal sound is generated or the tip of the paddle (4) is worn.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a powder stirrer used as a dioxin pyrolysis apparatus.

FIG. 2A is a cross-sectional view of the powder stirrer of Example 1, and FIG.
Fig. 2 is an internal schematic view of the powder stirrer.

FIG. 3 (a) is a cross-sectional view of the powder stirrer according to the second embodiment, and FIG.
Fig. 2 is an internal schematic view of the powder stirrer.

FIG. 4 (a) is a cross-sectional view of a conventional powder stirrer, and FIG. 4 (b) is a schematic internal view of the powder stirrer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shell 2 Rotating shaft 3 Paddle holding piece 4 Paddle 5 Sawtooth part 6 Wire brush 7 Immobile layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-297402 (JP, A) JP-A-4-70130 (JP, U) JP-Kyo 4-80728 (JP, B2) JP-Kyohei 5- 29074 (JP, Y2) Jiko 2-254 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01F ^7/ 00-7/32

Claims (2)

(57) [Claims] A rotary shaft (2) is provided at an axial center portion within a horizontal cylindrical shell (1), and a plurality of paddle holding pieces (3) are provided on the rotary shaft (2) in a radial direction. Piece
A paddle (4) is provided at the tip of (3), and
In a powder stirrer used as a pyrolyzer for ioxine , a plurality of paddle holding pieces (3) are attached to a rotating shaft (2).
Are arranged in pairs at regular intervals in the longitudinal direction,
Each pair extends in the opposite direction about the rotating shaft (2).
The paddle (4) is parallel to the tip of the paddle holding piece (3).
From the tip of the radial section and the radial section
The paddle (4) has a sawtooth (5) at the tip of the paddle (4), and a pair of paddle holding pieces (3). Provided in
Two rotating shafts (2)
Sawtooth (5) of one paddle (4) and the other paddle (4)
The sawtooth part (5) of the paddle (4)
A paddle in a powder stirrer, characterized in that the paddles are offset from one another so as to correspond to parts . 2. A rotary shaft (2) is provided at an axial center in a horizontal cylindrical shell (1), and a plurality of paddle holding pieces (3) are provided on the rotary shaft (2) in a radial direction. Piece
A paddle (4) is provided at the tip of (3), and
In a powder agitator used as a pyrolyzer for ioxine , a paddle (4) is attached to the tip of the paddle holding piece (3).
Radial part provided in parallel and the end of the radial part
A paddle in a powder stirrer, comprising a rectangular bent plate having a rectangular cross section having an inclined portion bent obliquely from above, and a brush (6) provided at a tip of a paddle (4).