JPH07198254A - Drying method and drying device - Google Patents

Abstract

PURPOSE:To eliminate a certain limitation such as a heater burn loss or a storing space for an item to be processed or the like and improve a drying efficiency by a method wherein a moisture containing item to be processed is mounted on a heat transfer member, the heat transfer member is heated from its surface of the item to be processed opposite to its mounting surface under an electromagnetic induction heating and concurrently hot air is blown against the item to be processed. CONSTITUTION:A moisture containing item to be processed M is fed into a heating container 1. A magnetic flux is generated at an iron core 7 under an electrical energization of a coil 8, the magnetic flux passes through a bottom plate 1A of the heating container 1 to generate an eddy current and then the heating container 1 generates heat. This heat is transferred to the item to be processed M through its heat transfer so as to perform a drying operation. Concurrently, the coil 8 is air-cooled by an air blowing means 9 and over-heating of the coil 8 is prevented, and at the same time air of which temperature is increased by air cooling is fed into the heating container 1 through guiding means 10, 14 and 18 and blown against the item to be processed M, so that the item to be processed M is efficiently dried within a short period of time by heatings with two systems of a heat transfer from a lower part and a conventional heat transfer from an upper part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for drying a water-containing treated material such as garbage.

[0002]

2. Description of the Related Art The conventional method for drying raw garbage is to store the raw garbage in a container equipped with a sheathed heater and directly heat the dried garbage by energizing the sheathed heater to dry the raw garbage. A method is known in which warm air is introduced to heat and dry food waste.

[0003]

According to the former method,
Although the thermal efficiency is good, there is a problem that dust is burned into the heater and the heater is burned out, and the heater limits the storage space for the raw dust. Further, according to the latter method, there is no problem like the former, but there is a problem that it takes a long time to dry and the drying efficiency is poor.

[0004]

The present invention has been made for the purpose of solving the above-mentioned problems, and the invention of claim 1 places a hydrous material on a heat transfer body. Then, the heat transfer body is heated by electromagnetic induction from a surface opposite to the object mounting surface thereof, and hot air is blown to the object to be processed, and the invention of claim 2 mounts the hydrous object to be processed. A heat transfer body to be placed, an electromagnetic induction heating means for electromagnetically heating the heat transfer body from the side opposite to the object mounting surface, and a warm air supply means for blowing hot air to the object to be processed. The invention of claim 3 is characterized in that, in claim 2, the heat transfer body comprises a heating container for accommodating the water-containing object to be treated, and the hot air supply means supplies the hot air generated by cooling the electromagnetic induction heating means. It is characterized by comprising means for supplying.

[0005]

According to the means described in claims 1 and 2, the heat transfer body is heated by electromagnetic induction, the object to be treated on the heat transfer body is heated by heat conduction from the heat transfer body, and the object to be treated is also heated. The object is heated by convective heat transfer by being blown with warm air, and is efficiently dried. According to the means described in claim 3, the object to be processed in the heating container is heated by the heat conduction from the heating container heated by the electromagnetic induction heating means, and the object to be processed cools the electromagnetic induction heating means. Also, it is heated by convective heat transfer by the heated air, and is efficiently dried. Moreover, overheating of the electromagnetic induction heating means is prevented.

[0006]

EXAMPLE A drying method according to an embodiment of the present invention is a method suitable for drying a water-containing material to be treated, specifically household garbage and the like. It is characterized in that it is placed on a body, the heat transfer body is heated from the side opposite to the object mounting surface side by electromagnetic induction, and hot air is blown to the object to be processed. With such a configuration, the heat transfer member is heated by electromagnetic induction, the object to be processed on the heat transfer member is directly heated by heat conduction from the heat transfer member, and hot air is blown to the object to be processed to convection transfer. It is also heated by heat, and two systems of heating, that is, heat conduction from the bottom and convective heat transfer from the top, are performed, so that it is efficiently dried. This drying method is specifically realized by the drying device K shown in FIG. An example of the drying device K will be described in detail below.

In FIG. 1, reference numeral 1 denotes a heating container as a heat transfer body on which an object to be processed is placed. The heating container 1 is provided with a first lid 3 having an opening 2 for feeding raw garbage M as the object to be processed. The upper end opening 4 is closed. As for the material of the heating container 1, from the condition that magnetic flux supplied by the electromagnetic induction heating means 6 to be described later is passed to generate an eddy current and that it is resistant to corrosion,
For example, stainless steel is used, but the material is not limited to this and may be steel. The opening 2 can be opened and closed by a detachable second lid 5. The first lid 3 is also preferably openable and closable so that the opening 4 can be opened as necessary for taking out the object to be processed and cleaning the inside of the heating container 1.

Numeral 6 is an electromagnetic induction heating means which is provided below the heating container 1 (on the side opposite to the object mounting surface) and which heats it from the outside, and which contacts the bottom surface of the heating container 1. The U-shaped iron core 7 and the coil 8 wound around the U-shaped iron core 7 are provided. By applying an AC voltage to the coil 8, the iron core 7
A magnetic flux generated in the heating container 1 flows through the bottom plate 1A of the heating container 1 to generate an eddy current, and the heating container 1 itself generates heat. The principle of this electromagnetic induction heating is well known. Power supply to coil 8 is 60/5
It is a commercial power source of 0 cycle, but is not limited to this.
Further, it is desirable that the iron core 7 is a silicon steel plate in order to suppress heat generation. Then, by providing a sensor (not shown) that detects the temperature of the iron core 7 or the heating container 1 and adjusting the current flowing to the coil 8, the temperature of the heating container 1 is safe and suitable for drying. For example, 150 degrees C to 200
Configure to adjust to C. This electromagnetic induction heating means 6
1 is not one, but a plurality of heating containers 1 are installed side by side, for example, along the bottom surface of the heating container 1 (the iron core 7 of FIG. 1 is vertically spaced from the paper surface of FIG. 1). It is desirable that a plurality of them are arranged in parallel to each other. By thus providing the plurality of electromagnetic induction heating means 6, the bottom surface of the heating container 1 can be uniformly heated over the entire surface.

The reference numeral 9 designates a blowing means including a blower such as a centrifugal blower for feeding air for cooling the coil 8 portion which is easy to heat.
0 includes the coil 8 of the electromagnetic induction heating means 6 and the blowing means 9
First guide means composed of a duct for guiding the air discharged from the partition wall member 11 and the main body bottom wall member 12 and a pair of side wall members 13 and 13 provided at a distance from each other (also serving as side walls of the dryer main body). It may be). The partition member 11 also has a function as a heat shield wall that prevents radiant heat from the upper portion of the iron core 7 from reaching the coil 8 side. It is desirable that the bottom wall member 12 and the side wall member 13 have a heat insulating or heat retaining function so as to reduce heat loss, for example, they are made of a heat insulating material. Reference numeral 14 is a second guide means which is connected to the first guide means 10 and communicates with the partition member 15, a side wall of the heating container 1,
The side wall member 16 of the dryer main body and a pair of main body side wall members 13 and 13 provided at a distance from each other are configured in a duct shape. Reference numeral 18 is a third guide means which is connected to the second guide means 14 so as to direct a horizontally extending portion 18A in the heating container 1 and the air flowing through the inside downward in the substantially central portion of the heating container 1. That is, it is composed of a blowing unit 18B that blows toward the object to be processed. Speech balloon 18B
The opening of the tip of is covered with a fine mesh member to prevent insects and the like from entering the inside of the guide means 18 when the operation is stopped. 19 is a heat insulating side wall member of the apparatus main body, 20 is a first
The air in the heating container 1 is exhausted to the outside through an exhaust path formed of a chimney attached to the lid member 3. When the first lid 3 is detachable, the chimney forming the exhaust passage 20 is preferably attached not to the first lid 3 but to the side wall upper portion 1A of the heating container 1.

The blower means 9 and the first guide means 10,
The second guiding means 14 and the third guiding means 18 function as a coil air cooling means for air cooling the coil, and guide the air that has been heated as a result of the coil air cooling, that is, the hot air, into the heating container 1 and blow it on the object to be treated. It also functions as a supply means. First guiding means 10, second guiding means 14, third guiding means 18
The configuration method of the air passage is not limited to that shown in the figure, and in short, it may be formed in a duct shape, and preferably has a structure excellent in heat retention. Further, it is desirable that the third guide means 18 be detachable at the root portion 18C so as not to disturb the removal of the dried object to be processed from the heating container 1.

Reference numeral 21 denotes an incinerator for incinerating an object to be treated and other incinerators, a lattice member 22 on which the incinerator is placed, and an incinerator chamber 2 below the lattice member 22 and above the lattice member 22.
3, a burner means 24 for supplying flame toward 3, an incinerator input opening 25, a lid 26 for opening and closing the opening, a chimney 27 and the like.

As shown in the figure, the exhaust passage 20 has an incinerator 21.
By communicating with the incineration chamber 23, it is desirable to prevent a fishy odor or the like generated by the drying of the drying device K from being released into the atmosphere.

Next, the operation of the drying apparatus of the above embodiment will be described. The second lid 5 is opened, and raw garbage as a hydrous object is put into the heating container 1 through the opening 2. After that, power is supplied to the coil 8 and the blower 9 to bring them into a driven state. When the coil 8 is energized, a magnetic flux is generated in the iron core 7,
This passes through the bottom plate 1A of the heating container 1 to generate an eddy current, and the heating container 1 generates heat. Then, this heat is transferred to the object to be processed M by thermal conduction, and the object to be processed M is dried. At the same time, the coil 8 is air-cooled by the blower 9 to prevent the coil 8 from overheating, and the air heated by the air-cooling is introduced into the heating container 1 by the guides 10, 14, 18 and blown onto the object to be treated. Therefore, the object M to be processed can be efficiently dried in a short time by heating the two systems by heat conduction from the bottom and convective heat transfer from the top. in this way,
Since the heat radiation accompanying the cooling of the electromagnetic induction heating means 6 is used for drying, the power consumption of the drying device can be reduced.

The air discharged from the heating container 1 is used as an incinerator 2.
When 1 is operated, it is incinerated, the release of fishy odor is prevented, and heat is supplied to the incineration chamber 23, which is utilized as an incineration heat source and the energy consumption of the burner means 24 can be reduced. .

In this way, the object to be dried is removed from the heating container 1 by removing the lid 5 and using a tool (not shown) for scooping the object to be incinerated in the incinerator 21 or fertilizer. And the like are used.

The drying method and the drying apparatus of the present invention are not limited to the above-mentioned embodiment, and the heating container 1 may be a flat plate-shaped heat transfer body instead of the container-like shape. Any structure may be used as long as an object can be placed and induction heating can be performed directly or indirectly. Indirect heating means that the iron plate 17 (heat transfer body) provided separately from the heating container 1 as in the embodiment of FIG. 2 is caused to generate heat, and the heat is transferred to the heating container 1 by heat conduction or radiation. The direct heating is a method in which the heating container 1 or the heat transfer body constitutes a magnetic circuit of the coil 8 as in the embodiment shown in FIG. Further, in the above embodiment, the induction heating means is configured to directly heat only the bottom plate of the heating container 1, but an electromagnetic induction heating means (not shown) is used so as to electromagnetically heat the vertical side wall of the heating container 1. May be provided. By doing so, the heating container 1 can be heated from the entire circumference, and the drying efficiency can be improved.

Further, the means for blowing warm air to the object to be treated is not a means for cooling the coil 8 but a means for separately providing a heating element such as a heater and blowing the heat to the object to be treated by a blower. It may be. In this case, it is necessary to cool the lower part of the iron core 7 and the coil 7 by opening them to the atmosphere. The warm air blowing means may be the exhaust gas from the boiler. It is also possible to provide a stirring means (not shown) for crushing and stirring the object to be processed in the heating container 1 so as to accelerate the drying of the object to be processed. It is also possible to make the heating container 1 detachable so that the dried object to be treated can be taken out easily.

Further, as a field of application of the method and apparatus of the present invention, it is preferable to dry household garbage, but it is not limited to this, and it is suitable for drying water-containing substances other than garbage. It can be used.

[0019]

As described above, according to the invention described in claims 1 and 2, since the object to be treated is heated by the combined use of induction heating and warm air heating, efficient drying can be realized, and Since the heating is performed by electromagnetic induction heating, it is easy to adjust the temperature of the heat transfer member, and the conventional problem that the object to be processed sticks to the heating means can be solved. Further, according to the invention described in claim 3, since the heat radiation for cooling the electromagnetic induction heating means is used for drying, it is possible to provide an economical drying device with a low running cost by effectively utilizing the heat.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a drying apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a schematic configuration of a drying apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating container (heat transfer body) 6 Induction heating means 8 Coil 9 Blower means 17 Iron plate (heat transfer body)

Claims (3)

[Claims] 1. A hydrous material to be treated is placed on a heat transfer body,
A method for drying, characterized in that the heat transfer member is heated by electromagnetic induction from the surface opposite to the object mounting surface thereof and hot air is blown to the object to be processed. 2. A heat transfer body on which a water-containing object is placed,
A drying apparatus provided with an electromagnetic induction heating means for heating the heat transfer body from the side opposite to the object mounting surface side by electromagnetic induction, and a hot air supply means for blowing hot air to the object to be processed. 3. The heat transfer body according to claim 2, wherein the heat transfer body comprises a heating container for containing the hydrous material, and the hot air supply means comprises means for supplying hot air generated by cooling the electromagnetic induction heating means. A drying device characterized by the above.