JPH0338637Y2 - - Google Patents

Description

[Detailed explanation of the idea]

<Field of Industrial Application> The present invention relates to a fluidized fluid dryer that dries inorganic raw materials, products, organic substances, etc. with hot air while rotating in a rotary manner. <Prior art> Conventionally, as an example of a fluidized drying device, for example, Japanese Utility Model Application Publication No. 55-57697 ``Industrial Waste Drying Processing Machine''
is disclosed. As an example of the prior art, for example, as shown in FIG. 11, a hot air discharge pipe 2 from a hot air generating furnace 1 is connected to one end of a drying cylinder 3, and a raw material feeding method is used to feed the raw material into the drying cylinder 3. A cylinder 4 is provided, a rotating shaft 6 having a plurality of stirring blades 5 is installed horizontally in the drying cylinder 3, and a cyclone cylinder 7 is connected to the other end of the drying cylinder 3 via a connecting pipe 10. This cyclone tube 7
The upper part is an exhaust port 8. Furthermore, the diameter of the drying cylinder 3 is large, and the rotating shaft 6
The rotation was performed at low speed. A dryer like the example above is used to dry materials (raw materials)
is fed into the drying tube 3 from the raw material feed tube 4, while hot air is also blown into the drying tube 3 from the hot air discharge tube 2 provided near the raw material feed tube 4. In the drying cylinder 3, undried materials with high moisture content and high specific gravity accumulate at the bottom of the raw material, but are scraped up and lifted upward by a stirring blade 5 equipped with a scraper 5a. At this time, if the substance is thick and has a lot of water, it will be slowly lifted upwards at low speed. Then, the hot air discharged from the hot air discharge pipe 2 at the top hits the scraped up raw materials, mixes them, dries them slightly, falls down again, is scraped up again, repeats the same process, and the raw materials gradually dry up. be done. The raw material is then heated by the back pressure of the hot air that is blown in one after another and by the exhaust fan 1 installed in front of the drying tube 3.
The raw material moves forward due to the suction force of 1, and as it moves, it is stirred by the stirring blade 5 and further dried.Finally, the raw material that has completed the drying process is transferred from the drying tube 3 to the connecting pipe 1.
0 into the cyclone cylinder 7, where it is separated into gas and solids, and the dried solids are directed downwards.
The gas is discharged into the atmosphere via the exhaust fan 11. <Problems to be solved by the invention> However, in this type of dryer, the drying cylinder 3
Due to the large diameter of the stirring blade 5, the rotation speed of the stirring blade 5 is low, and due to the structure, the hot air and raw materials are mixed only at the top of the drying cylinder 3, and the inside of the drying cylinder is one space. Therefore, the drying time was long and the drying efficiency could not be said to be high. <Means for solving the problems> The present invention was developed in view of the above-mentioned problems, and is aimed at drying inorganic raw materials/products and organic substances. It is intended to enable energy saving and multi-purpose use in combination with the drying method.It was made to improve the conventional drying efficiency and make thermal efficiency effective, and is configured as follows. The drying cylinder 3 has the shape of a horizontal cylindrical drum, and the inside thereof is vertically divided into a plurality of rooms, and this division is made by a partition plate 9 attached to a rotating shaft 6 and having a large number of holes 9a. A stirring blade 5 attached to a rotating shaft 3 is provided in the room. The rotating shaft 6 is rotated at high speed. Further, an air-force sorting screen may be attached to the discharge port 8 to separate coarse particles from fine particles or foreign substances (metals, coarse solids), and the like. The connecting device includes a raw material feeding tube 4 as a wet raw material supply feeder, a hot air generating furnace 1 at the inlet side of the drying tube 3, and a cyclone tube equipped with a cyclone separation device for separating gas and solids at the outlet side of the drying tube 3. 7. There are a product bunker 15 for storing products, a product discharge device 16 for discharging products, an exhaust fan 11, etc. <Operation> Next, the operation will be explained. First, the raw material is supplied into the drying cylinder 3 by the raw material feeding cylinder 4 as a quantitative feeder, and then the raw material is fed into the drying cylinder 3.
The hot air generated in is applied to the raw material and is caused to flow in the axial direction of the drying cylinder 3. Then, as the stirring blades 5 rotate at high speed, the hot air and raw materials that enter the first chamber A near the inlet become a swirling flow and are dispersed within the first chamber A. Heavy items gather downwards, and lightweight items gather upwards, and are pushed out by the hot air that is sent one after another, and are also pushed out through the holes 9a of the first partition plate 9 by the suction action of the exhaust fan 11. Then enter the second room B. The heavy raw materials gathered at the bottom are stirred in the first chamber A by the stirring blades 5, and the dryness progresses gradually by the hot air that is sent one after another, and the lighter materials are moved to the first partition as above. It is fed into the second chamber B through the hole 9a of the plate 9. In the second room B, the first room A
The same process as above is repeated, and the degree of dryness progresses gradually, and the weight becomes even lighter than in the first chamber A. This time, it is fed into the third chamber C through the hole 9a of the second partition plate. In this way, the dried raw materials are sent one after another to the next room, and the stirring blades 5 and the partition plate 9
As a result of simultaneous high-speed rotation of the raw materials, the raw materials are dispersed and suspended uniformly, forming a swirling fluidized bed, which contacts the hot air more efficiently and instantly accelerates and completes drying. Here, the partition plate 9 rotates at a high speed of 60 to 500 rpm, so it traps hot air and cuts off the raw material that is about to pass through the holes, and also removes some of the drying material that has accumulated in the upper part of the drying cylinder 3. Stir the highly concentrated raw materials, further promote the mixing of the raw materials with the hot air, bring them into close contact, and sufficiently increase the degree of dryness.
The features of the fluidized drying method can be fully utilized. Further, the pitch of the partition plate 9 is such that the first chamber A is initially narrow when viewed from the axial direction, and gradually widens as the degree of dryness progresses. The hole diameter of the partition plate 9 is made larger for oily, highly viscous and sticky raw materials such as fish meal, and smaller for smooth raw materials such as okara. <Example> Example of dryer specifications

[Table] Example of dimensional specifications (1) Pitch of partition plate 9 Approximately 300 to 1500 mm Best is 600 to 1200 mm - If the pitch is made larger than necessary, the resistance to feeding the raw material will increase and the stirring of hot air will deteriorate. Furthermore, if the length is too short, the fluidized stirring rate becomes uneven and the efficiency decreases. (2) Hole diameter of partition plate 9: approximately 10 to 30 mm - Increase the diameter if the raw material has high viscosity, and decrease the diameter if the raw material has low viscosity. (3) Rotation speed of rotating shaft 6 Normally 100 to 500r.pm Examples of multi-purpose specifications (1) In combination with a waste incineration boiler, drying wet combustible waste. (Example of energy saving using boiler exhaust heat) (See Figure 7) Example: Combustible materials such as paper lees, soy sauce lees, miso lees, fruit juice lees, bark, paper waste, sawdust, garbage, etc. (2) Catalytic deodorizer Food, feed,
Drying of odorous substances such as organic sludge. (See Figure 8) (3) Using the waste heat of the fluidized fluidized incinerator, organic sludge,
Drying human waste sludge, etc. (See Figure 9) (4) Drying feed, fertilizer, fish meal, and organic materials using an energy-saving, high-temperature gas recirculation system.
(See Figure 10) Other embodiments of the hot air/raw material mixing chamber (1) Figure 4 The partition plate 9 remains as it is, and the stirring blade 5
At the upper part of the drying cylinder 3, a chamber 12 is provided which bulges outward symmetrically with respect to the axis. Since hot air and raw materials are effectively mixed only in the upper part of the drying cylinder 3, by providing this expansion chamber 12, the volume in which the hot air and raw materials are effectively mixed and accumulated increases. Therefore, the degree of mixing is improved compared to one without the expansion chamber 12. (2) Fig. 5 The expansion chamber 13 is inclined with respect to the direction of rotation, so that mixing in the stagnant portion is performed more effectively. Experimental example (1) The experimental equipment is shown in Figures 1 to 6. (2) Specifications of the experimental equipment (i) Hot air generating furnace 700mm〓×1200mm ^L (ii) Drying tube External dimensions 600mm〓×2400mm ^L rotation Number 360r.pm Horsepower 3.7kw 3 partition plates (3) Test results (i) Raw material Okara Moisture content 80.1% Processing amount 130Kg Time 64 minutes (ii) After drying Moisture content 10.3% Shape Powder *Amount processed per hour 122Kg *The oxidation rate of okara is almost zero because the stagnation occurs within 60 seconds during stagnation in the drying cylinder. (iii) Dried product (okara) at Aichi Prefecture Food Industry Laboratory
Results of component analysis: Moisture 6.7% Ash 5.2% Protein 23.6% Fat 13.0% Fiber 13.4% Carbohydrate 38.1% Calorie 414 cal The present invention has been described above with reference to the illustrated embodiment, but the present invention is applicable only to those shown in the embodiment. The present invention is not limited to the above, and any design changes within the scope of the present invention are included within the technical scope. <Effects of the invention> The invention provides a partition plate inside the drying cylinder, and
Since the blades are rotated at high speed in synchronization with the stirring blades, the raw materials with high specific gravity and high water content that accumulate at the bottom of each stirring chamber are dynamically and forcibly stirred like a perforated water wheel. At the same time, the stirring blades are used to scrape the raw materials upwards, and the raw materials that have been scraped up by cutting into the hot air and the raw materials that have come straight from the raw material feed tube can be mixed with the hot air by thorough stirring. As a result, the degree of dryness has been dramatically improved compared to conventional methods, and the drying time has been reduced by half. Therefore, the hot air input per unit time can be reduced to that extent, resulting in an improvement in drying heat efficiency.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the fluidized fluid dryer of the present invention, and FIG. 1 is a cross-sectional view of the main part taken along the line - in FIG. Fig. 2 is a front view of the partition plate, Fig. 3 is a left side view of the device shown in Fig. 1, Fig. 4 is a view of the first example with an expansion chamber (-end view of Fig. 1), The figure also shows the second example, Figure 6 shows an example of a combination of a drying tube and a connecting device, Figures 7 to 10 show examples of multi-purpose specifications, and Figure 7 shows a waste incineration boiler. Fig. 8 shows a drying system for drying wet combustible waste, Fig. 8 shows a drying system for drying organic substances such as food, feed, fertilizer, organic sludge, etc. using exhaust heat from a catalytic deodorizing machine, and Fig. 9 shows a drying system for drying wet combustible waste. Figure 10 uses the exhaust heat of a type incinerator to dry organic sludge, human waste sludge, etc., and Figure 10 uses an energy-saving, high-temperature gas recirculation system to dry feed, fertilizer, fish meal, and organic substances. FIG. 11 is a diagram showing an example of a conventional fluidized fluidized dryer. 1...Hot air generating furnace, 2...Hot air discharge pipe, 3...
Drying cylinder, 4... Raw material feeding cylinder, 5... Stirring blade,
6... Rotating shaft, 9... Partition plate, 9a... Hole.

Claims (1)

[Claims for Utility Model Registration] A hot air discharge pipe from a hot air generating furnace is connected to one end of the drying cylinder, a raw material feeding cylinder is provided near the hot air discharge pipe, and the other end of the drying cylinder is provided with: Raw materials with fine particles and high moisture content, such as okara, have a suction and discharge port that is sucked in by an exhaust fan after passing through a cyclone separator, and a rotating shaft with multiple stirring blades is installed horizontally within the drying cylinder. In the dryer, a partition plate is provided which partitions the inside of the drying cylinder into a plurality of stirring chambers in the axial direction and substantially prevents the raw material from passing through the gap between the drying cylinder and the inner circumferential surface of the drying cylinder. A hole diameter of 10 is inserted between the blades of the partition plate.
A large number of holes of about ~30 mm are formed, and the partition plate is fixed to the rotating shaft so as to be rotatable, and further,
A fluidized fluid dryer characterized in that the rotating shaft has a rotational speed of 60 to 500 rpm.