JPH0699057A - Device for making contact between powdery substance and liquid - Google Patents

Abstract

PURPOSE: To make it possible to recover particulate matters from suspended matters in an air stream, to apply this device to agglomerating powder and to clean gases by trapping the particulate matters carried out together with a gas stream from a chamber into a bead-packed scattered body collecting bed. CONSTITUTION: The powder and the particulate matters are supplied from a hopper 7 with a screw type supplier after the upward flow of air passing through the chamber 1 becomes constant. Then, an atomized spray liq. is introduced from a spray head 8, the powder and the particulate matters are carried to a ceiling part 9 with an opening, pass through the filter bed having packed beads, which are a scattered body collecting filter 12, and the air, powder or particles are discharged to the outdoor air. On the other hand, the powder trapped into the filter 12 is shaked off into the chamber 1 with a vibration motor 16.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to the recovery of particulate matter from suspended matter in an air stream. In particular, it can be applied to agglomeration of powder. It also relates to a method of coating the granulate with a liquid.

[0002]

BACKGROUND OF THE INVENTION Particulate materials are commonly handled in fluidized bed systems. For example, when the powder comes into contact with the wetting agent, the powder accumulates in a large shape and the powder adheres. An important issue in performing such a process is to clean the powder in the air stream and prevent it from escaping the fluidized bed. Conventionally, as this method, a cloth or a back filter is provided at the uppermost part of the liquefaction chamber, and the powder is trapped in the pores of the filter or collected on the surface of the filter.

[0003]

Such filters suffer from the rapid clogging that often occurs in fluidized beds due to the moist atmosphere. Granular or powdered foods, such as sugar,
For eggs, cereals and similar products, the combination of high humidity and moderately high temperatures of gas is an ideal condition for bacterial growth.
Under these conditions there is a serious problem that bacterial contamination can occur even after just a few hours of the process. Therefore, standard processes with careful control of humidity and temperature are needed to eliminate such bacterial problems. You can also clean the filter in a very short time,
Or need to be replaced. The present invention seeks to provide a solution to the above problems.

[0004]

According to one aspect of the present invention,
Equipped with a processing chamber for the particulate matter to come into contact with the liquid,
While the particulate matter is held in the air stream in the processing chamber, it is guided to the step of coming into contact with liquid droplets, and the particulate matter in the air stream exiting the processing chamber is collected by the scatterer collection bed consisting of beads . As an example, a lump formed by contact of a powdery substance with water droplets of a liquid substance becomes a granular substance. Granular substances include grains, particles, flakes, etc. coated with liquid droplets, such as grains coated with sugar.

[0005]

The present invention is particularly effective in the batch type fluidized bed accumulation process. In this case, the wet spray, for example atomized water molecules, is introduced into the fluidized bed after a turbulent flow of gas and powder has occurred. Agglomeration may be used in techniques to dissolve flavored drink mixes such as chocolate drinks faster in water or aqueous solutions.

The beads forming the scatterer collection bed may be any shape of impinging particles and the surface may be uneven or smooth. However, it is preferable that the scatterer collection bed is composed of circular impermeable beads such as an ellipse, a cylinder, and a sphere. Solid plastics are preferred because they do not react with the material being processed, but can be easily cleaned. 10-15mm diameter, eg 13mm
Made of polystyrene or PVC with a floor depth of 200-10
00 mm, preferably 200-600 mm, eg 300 mm
The ones are effective. The beads have a specific gravity that does not float in the air flow, and when packed, they both serve to form a passage for collecting the powder.

[0007]

A preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partial elevational view of the apparatus, showing a batch fluidized bed apparatus. Reference numeral 1 denotes a flow chamber, which has a divergent wall on the upper side and is provided with an entrance / exit or a peephole 2. The open bed 3 has an inlet 4 for holding the substance to be flowed, which is the inlet for a flowing gas such as air from a blower 14 and is connected to a movable basket 5, which is usually cylindrical. The powder or granular material entering the process is fed by the screw type feeder from the hopper 7 by the motor 6 after the upward flow of air through the chamber 1 becomes constant.

After the flow conditions in the chamber 1 are set, moisture, that is, a spray liquid in the form of spray is introduced from the spray head 8. This spray head is preferably installed at about 2/3 of the height of the fluidized bed chamber 1. The top of the chamber 1 is covered with a ceiling 9 provided with an opening having a size through which powder or particulate matter conveyed by an air flow can pass. A lid 10 and an air outlet 11 are provided at the top of the chamber. The ceiling portion 9 with openings is provided with a filter bed filled with densely packed beads 12, and air is passed through the filter bed,
The powder or particles are discharged to the outside air. The gas flow of the processed product is intermittently stopped, and the processed product is slid out of the basket 5.

In one embodiment of the present invention in which powdery particles are aggregated to form granules, atomized spray water is sprayed from a spray head 8 into the agitated fluid powder in a chamber 1. The amount of water sprayed is measured and sent to the spray head for spraying. The moisture is then stopped and the powder is dehydrated until it contains a suitable amount of water to form agglomerated particles. The heated air is supplied into the chamber 1 by igniting the heater 15. After stopping the heating air, the aggregated particles are extracted from the basket 5.

The powder trapped in the scatterer collecting filter 12 is shaken off from the filter into the chamber 1 by operating the vibration motor 16. The ceiling part including the collection floor is separated from other parts by a flexible connection. The powder thus recovered is used as a powder for aggregation in the next batch. The device according to the invention makes it possible to integrate subsequent batch processing plants. That is, the application No. pending by the applicant.
As disclosed in 91309612.9 (Publication No. 0481799), sequential operating stages can be incorporated, such as the first stage and subsequent stages, if desired. The effluent from the first treatment stage is transferred to the next stage batch treatment plant. It is also possible to use a pair of agglomerators in parallel, with one of the devices operating the other while the product is being transferred to the sequential batch processing plant.

[Brief description of drawings]

FIG. 1 shows a partial elevational view of one embodiment of the device of the present invention.

[Explanation of sign]

 1 Chamber 2 Peep Window 3 Open Floor 4 Entrance 5 Basket 6 Motor 7 Hopper 8 Spray Head 9 Ceiling 10 Lid 11 Air Discharge Port 12 Beads 15 Heater

Claims (9)

[Claims] 1. A device for bringing a particulate matter into contact with a liquid, wherein the particulate matter is introduced so as to come into contact with a liquid dispersed in a droplet form, wherein the particulate matter is caused by a gas flow. An apparatus comprising a processing chamber supported in a floating state, characterized in that particulate matter carried out together with a gas flow from the chamber is trapped in a bead-filled scatterer collection bed. 2. The apparatus according to claim 1, wherein the particulate matter is a powdery matter, and the powdery matter forms agglomerated particles by contact with water droplets. 3. The apparatus of claim 1 wherein said particulate matter is liquid-coated grain granules, grains, flakes. 4. A device according to any one of claims 1 to 3, wherein the beads are substantially liquid impermeable with rounded corners. 5. An apparatus according to any one of claims 1 to 4, wherein the collection bed comprises beads of substantially spherical shape. 6. An apparatus according to claim 1, wherein the processing chamber comprises a fluidized bed provided with means for ejecting atomized droplets. 7. The dispersion-collecting layer comprises an aggregate of beads of an impermeable substance that is dense enough not to float substantially by a gas flow forming a fluidized bed. apparatus. 8. A bead stirring means for desorbing the powder trapped in the scatterer collection bed.
8. The device according to any one of 7 to 7. 9. A fluidized bed apparatus equipped with a particulate matter, a processing fluid chamber, a fluidizing gas inlet, and an outlet for exhausting gas from the chamber, wherein the particulate matter is separated from the gas stream by filtration. A fluidized bed apparatus, wherein the filter means is a scavenger trap bed of substantially impermeable beads for trapping powder entrained in the gas stream.