JPS5823299B2 - Airtight discharge device for powder and granular materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an airtight discharge device for powder and granular material that is installed at the lower part of a granular material separator, such as a cyclone, and discharges the powder and granular material continuously, quantitatively, and airtightly.

As a typical prior art, there is an airtight discharge device that utilizes the fluidization phenomenon of powder and granules as shown in FIG.

In this device, a supply pipe 3 and a discharge pipe 4 that extend vertically are arranged offset in a horizontal plane, and a control wall 5 and a weir 6 that overlap each other with a distance l in the vertical direction are provided between them, and Forming a reservoir portion 7 of the body.

Gas is introduced into the storage portion 7 from a fluidization means 9 including a perforated plate 8 provided at the lower part of the storage portion 7 to fluidize the powder.

As a result, the powder and granules are continuously overflowed over the weir 6, and the airtightness between the supply pipe 3 and the discharge pipe 4 is maintained.

However, in such an airtight discharge device, when the coating adhering to the cyclone (not shown) at the upper part of the supply pipe 3 becomes a lump and falls into the storage part I, the lump becomes difficult to cross the weir 6 and cannot be discharged. Not done.

In this case, if a large amount of gas is used to fluidize the powder,
The gas reaches the cyclone above, and the airflow vortex inside the cyclone becomes unstable, impairing the separation function of the cyclone.

Furthermore, when this airtight discharge device is applied to the preheating device of a cement raw material firing device, if a relatively low temperature gas such as room temperature air is used as the fluidizing gas, the preheated granular raw material will be cooled instead. This results in a disadvantage that the heat exchange rate decreases.

The present invention has excellent airtightness, can continuously discharge powder and granules, and can also discharge large lumps such as coatings, and can easily adjust the amount of accumulated powder and granules to be discharged. The purpose of the present invention is to provide an airtight discharge device that can be used even for high-temperature powder and granular materials.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a front view of one embodiment of the present invention, and FIG. 3 is a longitudinal sectional view thereof.

This airtight discharge device is installed at the bottom of a cyclone included in a suspension preheater of a cement raw material firing device.

An angular or cylindrical supply pipe 10 that communicates with the lower part of the cyclone and whose bottom part 10a is closed and extends vertically and an angular or cylindrical discharge pipe 11 that extends up and down are arranged at shifted positions in a horizontal plane. be done.

A fluidizing means 12 is provided at the bottom of the supply pipe 10 .

Fluidization means 1 is provided along the side wall of the supply pipe 10 on the discharge pipe 11 side.
A control wall 13 is provided above 2.

On the other hand, in the upper part of the discharge pipe 11, a weir plate 14 that faces the control wall 13 and extends up and down is rotatably provided around a rotation shaft 18.

The lower end of the weir plate 14 can come into contact with the end of the bottom portion 10a on the discharge pipe 11 side.

In this way, a storage portion 15 for the powder raw material is formed between the supply pipe 10 and the discharge pipe 11.

Referring to FIG. 4, the fluidizing means 12 includes a plurality of tube bodies 16 (three in the figure) provided substantially horizontally in parallel with each other at the lower part of the storage portion 15, and these tube bodies 16 are commonly connected. is,
and a gas supply pipe 17 for introducing gas.

A large number of jet ports 19 are provided in each tube 16 .

The weir plate 14 is driven by a rotation means 24.

The rotating means 24 includes a rotating shaft 18 rotatably supported on the side wall of the discharge pipe 11, an arm 20 fixed to one end 18a of the rotating shaft 18 outside the discharge pipe 11, and A weight 21 attached with its axial position adjustable
including.

The weight 21 is screwed onto the arm 20, for example, and its position is adjusted by screwing forward and backward along the arm 20.

The arm 20 is connected to the weir plate 1 with respect to a vertical plane including the rotation axis 18.
Therefore, the moment M (see Fig. 2) by the weight 21 acts on the weir body 14 as shown by the arrow, and the lower end of the weir plate 14 is biased to the right. Ru.

When the powder 22 collected by the cyclone is deposited in the storage part 15, the supply pipe 10 and the discharge pipe 11 leading to the cyclone are
This is blocked by the accumulated powder 22, and the airtightness of the cyclone is maintained.

The gas supply pipe 17 is connected to a gas source (not shown), such as a blower that pumps air at room temperature, and the gas supplied from the blower is ejected from the spout 19 of the pipe body 16, thereby causing the powder and granular material 22 to be The powder becomes a mixed state and becomes fluidized.

Due to this fluidization phenomenon of the granular material 22, the granular material 22 is continuously, quantitatively, and airtightly overflowed from the storage portion 15 over the weir plate 14 into the discharge pipe 11.

When large lumps such as coatings that have fallen from the cyclone accumulate in the storage portion 15, the fluidization phenomenon in the storage portion 15 is inhibited, and the ability to discharge the powder and granular material 22 to the discharge pipe 11 is reduced.

Therefore, the powder 22 accumulates in the storage part 15 one after another, the powder pressure acting on the weir plate 14 increases, and the balance with the moment l-M caused by the weight 21 is lost, causing the weir plate 14 to The storage portion 15 is opened as shown by the chain line, and the bottom of the storage portion 15 is opened.

As a result, large lumps such as coating deposited in the storage portion 15 are discharged to the discharge pipe 11 together with the powder and granular material 22.

When the amount of granular material 22 deposited in the storage portion 15 decreases, the weir plate 14 is restored as shown by the solid line due to the moment M of the weight 21, and the granular material 22 begins to be deposited in the storage portion 15.

When the amount of accumulated powder and granular material is extremely small, such as during startup, the fluidizing means 12 does not work effectively, so that the powder and granular material 22 does not become in an aerated state. The water cannot overflow beyond the weir plate 14.

In this case, the weir plate 14 can be rotated even when a small amount of accumulation occurs by leaving the bottom of the storage section 15 open at an opening degree that suits your needs, or by moving the weight 21 along the arm 20 as appropriate. By doing this, you can make the discharge action more flexible.

The bottom portion 10a of the supply pipe 10 forming the bottom portion of the storage portion 15 may be flat, but it is convenient for discharge if it is formed as an inclined surface as shown.

Furthermore, the weir plate 14 may be entirely rotatable as shown in the figure, or only a portion of the lower portion may be rotatable.

Note that the inclination angle α of the bottom portion 10a of the storage portion 15 is
It goes without saying that by setting the angle of repose to 20 or more, it is possible to prevent the powder 22 from remaining during evacuation.

FIG. 5 is a sectional view of another embodiment of the present invention, and FIG.
Parts corresponding to the embodiment of FIG. 4 are given the same reference numerals.

In this embodiment, a valve 27 is provided in the middle of the gas supply pipe 17, and one end of a branch pipe 25 having a valve 28 in the middle is connected to the upstream side of the valve 27.

The other end of this branch pipe 25 is connected to the upper part of the powder deposited layer 26 in the supply pipe 10 .

The opening of the valves 27 and 28 means that the powder and granular material 2 in the storage section 15
The amount of accumulation of No. 2 is set to a preset value.

If the amount of deposited powder 22 in the storage portion 15 increases abnormally in this state, the amount of gas at the opening 25a increases depending on the distance from the opening 25a in the supply pipe 10 of the branch pipe 25 to the upper surface 26a of the deposited layer 26. Distribution resistance becomes a dog.

Accordingly, the amount of gas ejected from the branch pipe 25 becomes small, and the amount of gas ejected from the tube body 16 becomes small.

Therefore, fluidization of the powder and granular material in the storage portion 15 is promoted, the amount of discharge to the discharge pipe 11 becomes small, and the storage portion 15
Excessive accumulation of powder and granules in the process is prevented.

As mentioned above, the weir plate 14 may be of any type as long as it rotates when the balance with the amount of granular material 22 deposited in the granular material storage portion 15 is lost. In addition to the structure using the above-mentioned weight 21, a structure in which the weir plate 14 is elastically biased by a spring or the like may be used.

In the above embodiment, a Zyclone airtight discharge device used in a preheating device of a cement raw material firing device was described.
It goes without saying that the present invention can be broadly implemented in connection with devices in other technical fields for airtightly discharging powder or granular materials.

According to the present invention, the following remarkable technical effects can be obtained.

In other words, when lumps fall into the storage section, they can be quickly discharged, and the amount of discharge can be increased or decreased depending on the amount of powder and granules supplied. Sealing can be performed reliably.

Furthermore, since the amount of powder particles deposited is maintained at an appropriate level, fluidization can be performed using the minimum necessary amount of gas.

Therefore, even when used in a preheating device for menthol raw materials, the heat exchange performance is not inhibited.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the prior art, Fig. 2 is a front view of an embodiment of the present invention, Fig. 3 is a longitudinal sectional view of Fig. 2, and Fig. 4 is a longitudinal sectional view of Fig. 1 and Fig. 2. FIG. 5 is a cross-sectional view taken along the section line -IV, and a vertical cross-sectional view of another embodiment of the present invention. 10... Supply chamber, 10a... Bottom, 1
1...Discharge pipe, 12...Fluidization means,
14...Weir plate, 15...--Storage part, 1
8...Rotation axis, 20...Arm, 21
... Weight, 22 ... Powder, 24 ...
...Rotating means.

Claims (1)

[Scope of Claims] 1. A supply pipe that extends vertically and is closed at the bottom; a discharge pipe that extends vertically and is disposed offset from the supply pipe in a horizontal plane and is connected to the supply pipe; the lower end is at the bottom of the supply pipe; It is capable of coming into contact with the end of the discharge pipe, extends vertically to form a particulate material storage area between the supply pipe and the discharge pipe, and is rotatable at least at the lower part around a horizontal axis. a weir plate, a fluidizing means provided at a lower part of the storage section to fluidize the powder and granular material, and at least a lower part of the weir plate is rotated around a horizontal axis according to the amount of powder and granular material deposited in the storage section. An airtight discharge device for powder and granular material, characterized by including a rotating means. 2. The rotation means is fixed to a horizontal rotation shaft that pivotally supports at least a lower part of the weir plate, and an end of the rotation shaft outside the storage portion, and is fixed to the weir plate with respect to a vertical plane including the rotation shaft. The airtight discharge of powder and granular material according to claim 1, characterized by comprising an arm extending on the opposite side of the plate, and a weight attached to the arm so that its position along the axial direction can be freely adjusted. Device.