JPH07109031A - Large-volume supply and dispersion device for powder and granules - Google Patents

Abstract

(57) [Summary] [Purpose] A large amount of fine particles are continuously and stably dispersed and supplied. [Constitution] A hopper 1 for storing and supplying the granular material 7 inside
The screen 2 is disposed below the. A vibrating connecting rod 3 provided with a vibrating plate 4 is arranged at a constant distance from the lower portion of the screen 2. An ultrasonic oscillator 5 is attached to the vibration connecting rod 3, and an ultrasonic transmitter 6 is provided on the ultrasonic oscillator 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-quantity supply / dispersion apparatus for powders and granules, and more particularly to a large-quantity and constant-quantity supply / dispersion apparatus for powders and granules having an average particle size of 50 μm or less.

[0002]

2. Description of the Related Art Conventionally, as a device for quantitatively and continuously supplying a granular material, a rotary table type, a screw type,
There is a vibration feeder type. All of these are suitable for supplying a large amount of powdery particles having a relatively large particle size, but are not suitable for quantitative and continuous dispersion supply of a large amount of powdery particles having an average particle size of 50 μm or less. This is because the smaller the particle size of the granular material, the greater the cohesive force between the granular particles, and the more difficult the stable supply of the granular material becomes.

That is, when a certain amount or more of the particles are gathered near the supply port and the discharge pressure overcomes the cohesive force between the particles, a large amount of the particles is discharged at one time. Therefore, a phenomenon occurs in which the supply of the granular material is not continuous and pulsates. This phenomenon becomes more remarkable as the cohesive force increases as the particle size of the powder becomes smaller, and the discharge pressure of the powder that gathers near the supply port increases as the supply speed of the powder becomes smaller. It becomes remarkable because it takes a lot of time.

FIG. 5 shows an apparatus disclosed in Japanese Utility Model Laid-Open No. 1-134628 as an apparatus for solving this pulsation phenomenon. The device 11 includes a supply pipe 13 for supplying powder and granular material, an amplitude-enhancing horn 16 and an ultrasonic vibrator 15 which are connected to a vibration transmission rod 14 which penetrates the supply pipe 13, and a vibration transmission rod. The diaphragm 17 is fixed to the tip of the diaphragm 14, contacts the supply pipe 13, and has a plurality of fine holes 21 as shown in FIG. Since the device 11 vibrates the diaphragm 17 having the fine holes 21 using ultrasonic vibration, the diaphragm 17
It is possible to fluidize the upper granular material 12 and allow it to flow out uniformly from each fine hole 21. As a result, it becomes easy to continuously and stably supply a small amount of the powdery or granular material 12 in the supply pipe 13 quantitatively. Also, the supply amount is the ultrasonic transducer 1.
Adjustment can be easily performed by changing the vibration condition or the like according to item 5. Further, since the vibration having a high vibration frequency is used for supplying, it is excellent in that an extremely quiet quantitative supply operation can be performed.

[0005]

[Problems to be Solved by the Invention] Indeed, Kaikaihei 1-1
The apparatus described in Japanese Patent No. 34628 is a target of constant supply, for example, when a powdery material such as a chemical is filled in and stored in a packaging bag, or when a fine cleaning material is projected to clean the material to be ground. Is effective when the amount is relatively small.

On the other hand, in the exhaust gas from a refuse incinerator, a waste incinerator, a waste melting furnace, a sintering machine, etc., acidic harmful substances such as sulfur oxides and hydrogen chloride (HCl) are usually 100 to 300 p.
It is contained in the proportion of pm, and various gas treatment methods have recently been developed to remove these harmful substances. For example, in order to remove acidic gas such as hydrogen oxide in the exhaust gas, a large amount of fine powder particles made of an alkaline component such as slaked lime are continuously and uniformly blown into the exhaust gas to neutralize the exhaust gas. In this case, how to continuously and uniformly blow a large amount of fine particles into the exhaust gas is important because it greatly affects the acid gas removal efficiency. When a large amount of fine particles are continuously blown in as described above, the device has no effect.

As an example, the amount of exhaust gas depends on the type of equipment,
Approximately 30,000 to 15,000,000, depending on scale
Nm ³ / Hr is a large amount, and the required amount of fine particles of an alkaline component continuously blown to remove acidic gas such as hydrogen chloride contained in the exhaust gas is about 30 to 150.
It is 0 kg / Hr, which is a large amount. If the amount of fine particles required is large, the diaphragm of the device must necessarily be large. Then, if the vibration transmission rod is arranged only at one place in the center of the diaphragm, the high frequency vibration will be attenuated at a place outside the diaphragm even if the power of the ultrasonic transducer is increased. , It becomes difficult to fluidize the granules on the outside of the diaphragm, and it is not possible to evenly discharge the granules from the fine holes, and finally the granules are suspended inside. Will occur and all will be blocked.

In this case, it is conceivable to dispose a plurality of vibration transmitting rods on the vibrating plate. However, powder particles adhere to the arranged vibration transmitting rods, and the powder particles start from this adhesion. Not only will the body be hung on the shelf, but the equipment cost of the vibration adding equipment will be high, and maintenance will be complicated.

[0009]

SUMMARY OF THE INVENTION The gist of the present invention is to dispose a screen below a hopper that stores and supplies powder and granules therein, and to apply ultrasonic vibration at a certain distance from the bottom of the screen. A means for supplying and dispersing a large quantity of powder and granules, characterized in that the powder and granules in the hopper are indirectly fluidized by the means for applying ultrasonic vibration and flow out from the lower part of the screen. As the ultrasonic vibration applying means, it is preferable that a plurality of vibrating plates are attached to the plurality of vibrating connecting rods, an ultrasonic transducer is attached to the vibrating connecting rods, and an ultrasonic transmitter is provided in the ultrasonic transducers.

[0010]

In the apparatus of the present invention, when the vibration plate arranged under the screen under the hopper is vibrated by the ultrasonic vibrator arranged outside the system, the air between the vibration plate and the screen violently vibrates. To do. As a result, uniform vibration is applied to the entire surface of the granular material on the screen, and the granular material is fluidized and continuously flows out uniformly from each hole. While the outflowing powder and granules flow down between the screen and the vibrating plate, the agglomerated powder is further dispersed by vigorous vibration of air and becomes a uniform fine powder.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall outline of an example of the apparatus of the present invention. A screen 2 having a large number of holes is arranged below a hopper 1 for storing and supplying the powder and granules 7. A vibration plate 4 and an ultrasonic oscillator 5 are attached to the vibration connecting rod 3, and an ultrasonic transmitter 6 is provided on the ultrasonic oscillator 5.

The size of the gap between the lower surface of the screen 2 and the upper surface of the vibrating plate 4 varies depending on the opening ratio of the screen 2, the supply amount, the applied frequency, the particle size of the granular material, etc., but is about 5 mm to 150 mm. preferable. When it is 150 mm or more, vibration of air is attenuated, which is not preferable. The screen 2 may be a wire mesh or a punching plate having slits or small holes in a steel plate or the like.

The suitable range of the high frequency transmitted to the ultrasonic oscillator 5 varies depending on the particle size of the target powder or granules, adhesion and cohesiveness, etc., but is preferably 1 to 40 kHz from the viewpoint of mechanical vibration strength of the apparatus.

FIG. 2 shows an AA cross section of FIG. According to the shape of the hopper 1, the vibrating connecting rod 3, the vibrating plate 4, the ultrasonic transducer 5, and the ultrasonic transmitter 6 are arranged radially (FIG. 1A) or in parallel (FIG. 2B). Thereby, ultrasonic vibration can be uniformly transmitted to the powder particles on the screen.

FIG. 3 is a sectional view taken along line BB of FIG. Diaphragm 4
Various shapes can be adopted as shown in the figure.

FIG. 4 shows an example of using the device of the present invention.
This is an example in which the apparatus of the present invention is installed between the waste incinerator 8, the boiler 9 and the dust collector 10. Exhaust gas generated by incineration of waste is continuously blown with a large amount of fine powder particles made of an alkaline component such as slaked lime in the apparatus of the present invention to make it harmless by neutralization treatment, and is discharged from the chimney 22 to the atmosphere. Can be dissipated.

[0017]

EFFECTS OF THE INVENTION
By connecting a large number of diaphragms to the continuous vibrating rod, it is possible to increase the size of the equipment while ensuring the function of the equipment. Therefore, even a large amount of powder or granules can be continuously and stably supplied and dispersed. In addition, since the screen area can be increased, the deposition pressure of powder particles can be reduced, and even ultrafine powder that tends to be suspended does not hang, and when the screen area is increased, foreign matter and coarse particles are mixed. However, stable quantitative supply is not hindered. Then, the large-quantity supply and dispersion device of the powder and granules of the present invention has a large dispersion effect, so that the specific surface area of the powder and granules after dispersion is large, and the contact efficiency between the powder and granules, the carrier gas, and the gas to be treated is improved, The reaction efficiency increases.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a device of the present invention.

FIG. 2 is a view showing a cross section taken along the line AA of FIG.

3 is a diagram showing a BB cross section of FIG. 1. FIG.

FIG. 4 is a diagram showing an example of using the device of the present invention.

FIG. 5 is a diagram showing a conventional device.

FIG. 6 is a diagram showing a diaphragm of a conventional device.

[Explanation of symbols]

 1 Hopper 2 Screen 3 Vibration connecting rod 4 Vibration plate 5 Ultrasonic transducer 6 Ultrasonic oscillator 6 Ultrasonic wave transmitter 7 Powder / granule 8 Incinerator 9 Boiler 10 Dust collector 11 Powder / granular material quantitative supply device 12 Powder / granular material 13 Supply pipe 14 Vibration Transmission rod 15 Ultrasonic transducer 16 Amplitude amplification horn 17 Vibration plate 18 Micro hole 21 Micro hole 22 Chimney 23 Blower

Claims (2)

[Claims] 1. A screen is disposed below a hopper for storing and supplying powdery and granular materials therein, and ultrasonic vibration applying means is disposed at a constant interval from the lower part of the screen, and the ultrasonic vibration is applied. An apparatus for supplying and dispersing a large amount of powder or granules, characterized in that the powder or granules in the hopper are indirectly fluidized by an adding means to flow out from the lower part of the screen. 2. As an ultrasonic vibration applying means, a plurality of vibrating plates are attached to a plurality of vibrating connecting rods, an ultrasonic transducer is attached to the vibrating connecting rods, and an ultrasonic transmitter is provided to the ultrasonic transducers. The apparatus for supplying and dispersing a large amount of powdery or granular material according to claim 1, characterized in that.