JPH05146773A - Heating and drying device - Google Patents

Abstract

PURPOSE:To prevent the generation of steam and malodor by obliquely arranging a rotating vessel for garbage, arranging a condensation part consisting of the wall material with the heat conductivity higher than the heat conductivity of the wall material of the rotating vessel, communicating the vessel with the condensation part and furnishing a cooling means to the condensation part. CONSTITUTION:A rotating vessel 4 consisting of a stainless steel double vessel is obliquely arranged. A condensation tank 1 made of a microwave reflecting material is arranged outside the vessel 4, a door 3 is provided, and the vessel 4 is communicated with the tank 1 through a connecting part 13. The heat conductivity of the wall material of the vessel 4 in its thickness direction is made lower than the conductivity of the wall material of the condensation part 1. The vessel 4 is rotated by a motor 8, the microwave of a microwave generator 5 is radiated into the vessel 4 through a waveguied 7 to form a strong electric field. Meanwhile, the condensation tank 1 is cooled by a cooling blower 14, and the condensed water is discharged from a drain pipe 15. Steam is sucked by a blower 16 and passed through a heater 17 and a catalyst 18 to oxidize the malodor.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a small-scale device for easily treating food waste generated in kitchens, hospitals, etc.
Used for drying equipment for feed, powder, etc.

[0002]

2. Description of the Related Art When heat drying is carried out, the separated liquid is usually discharged as a gas to the atmosphere. In some cases, the odor contained in such vapor is condensed together with the separated liquid so as not to be discharged to the outside. This is often due to a large cooling plant, where the drying part and the condensing part are separated, and there was no one suitable for a small structure.

[0003]

In the case of electric power drying suitable for a small size, contact heating by a heater or non-contact heating by a microwave is generally used. However, contact heating by a heater causes uneven heating and drying, and partial heating. However, there is a problem in that the material to be dried is decomposed and odorous components are generated. Also, when microwaves are used, the intensity distribution of the electric field of microwaves is non-uniform and the same problem occurs.

It is an object of the present invention to improve the above-mentioned problems and to provide a condensing section around the drying section, which is suitable for a compact structure, and to provide means for reducing the generation of odor with this structure. And

[0005]

According to the present invention, there is provided an inclined rotary container for accommodating, a heating means, and a condensing section provided around the rotary container. The thermal conductivity in the thickness direction is smaller than the thermal conductivity of the wall material of the condensation section.

[0006]

The heated material to be dried generates steam to be dried. When the heating and drying operation is continued, the distribution of moisture and the amount of heat transfer of the heating means is not uniform, so that the generation of a small amount of decomposition products due to the partial temperature rise of the material to be dried cannot be completely avoided.
Also, since the material to be dried is dried from the top, the material to be dried at the bottom is difficult to dry. Therefore, if the rotary container is tilted and rotated like a concrete mixer truck and the material to be dried inside is also stirred vertically, the material can be uniformly dried. At this time, since the heated object to be dried and the rotary container are in heavy contact with each other, the heat of the object to be dried heats the rotary container. If the heat insulation of the rotating container is poor, the heat of the material to be dried is transmitted to the condensing part through it, heating the condensing part and deteriorating the condensing performance. According to the present invention, the heat insulation of the rotary container is made larger than the heat insulation of the condensing part, so that the temperature of the condensing part is lowered and the condensing performance becomes good. For this reason, in the present invention, the decomposition products are uniformly heated and the decomposition products are little generated, and the generated decomposition products are almost condensed, so that no odor is emitted to the outside.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a condensing tank made of a microwave reflecting material, and an object to be dried, for example, raw garbage 2 is put into a rotary container 4 through a door 3 that opens and closes the condensing unit 1. The rotating container 4 may be a stainless double vacuum container or a heat insulating container made of heat-resistant foamed plastic. The microwave is oscillated by the microwave oscillator 5, passes through the waveguide 6, and is radiated from the opening 7 into the inside of the rotary container 4 to form a strong electric field. The lower part of the rotary container 4 is a rotary table 9 connected to the motor 8. The rotary shaft 10 and the bottom of the condensing tank 1 are liquid seal bearings 11. The door 3 above the rotary container 4 is placed on a condensation lid 12 provided at the top of the condensation tank 1. Between the condensation lid 12 and the upper part of the rotary container 4, the inside of the rotary container 4 and the condensation tank 1
The communication part 13 of is formed. The outside of the condensing tank 1 is cooled by a blower 14 for cooling. At the bottom of the condensing tank 1, there is a drain pipe 15 for condensed water. Condensed water is discharged to the sewer pipe. The water vapor that does not condense is sucked by the blower 16, and the catalyst 18 having the heater 17 oxidizes and decomposes the decomposed product that becomes the odor component in the exhaust gas. Above the condensation lid 12, a temperature detector 19 for rising water vapor is provided. Blower 14
Part of the cooling air from the air vent 20 is the microwave seal door 2
1 and the space of the condensation lid 22 and discharged from the air holes 22.

The operation of the present invention having the above configuration will be described below. The garbage 2 is put into the rotary container 4 through the door 3. When the microwave oscillator 5 oscillates a microwave in such a state, a microwave of 2450 MHz enters the rotating container 4 from the waveguide 6 and creates a high electric field in this space. The microwaves are reflected by the metal wall and are almost absorbed by the water in the food waste 2. Microwaves penetrate from above the garbage and are attenuated at the bottom of the garbage. Further, the electric field strength is weak at the bottom of the metal rotating container, which causes uneven drying of the food waste. Therefore, by rotating the inclined shaft with a motor, the rotating container 4 is rotated like a concrete mixer truck. The garbage 2 is turned upside down while rotating and dried uniformly.

The water vapor is discharged to the condensing tank 1 through the communicating portion 13. Since the metal wall of the condensing tank 1 is cooled by the blower 14, the water vapor is condensed and flows down to the drain pipe 15 below.
Wastewater is heated uniformly so that it contains less organic substances and does not pollute the sewer. The water vapor that does not condense contains some decomposed gas from the food waste 2.
The catalyst 18 preheated in 7 is oxidized and deodorized.

The reason for condensing water vapor is as follows. If there is a large amount of water vapor, it will condense at the exhaust port 16 and if it leaks, it will easily damage the house. Further, the catalytic reaction amount depends on the residence time of the gas to be treated in the catalyst, but if the steam is strong, the odorous component does not easily pass through the catalyst 15 at a high speed to react. In the present invention, since the water vapor is condensed to reduce the volume, the residence time becomes long. Furthermore, a large amount of odorous components are condensed along with the condensation of water vapor, which leaves room for the processing capacity of the catalyst.

However, when the container is rotated obliquely for uniform drying, the food waste 2 rotates and a large amount of heat is generated while the container 4 rotates.
Tell. Since heat is more easily transferred to the container than when it is stopped, if this heat is transferred to the outside of the rotary container 4, the water vapor in the condensing tank 1 will be heated and less likely to condense. Therefore, in the present invention, the rotary container is made of a heat insulating material so that the heat of the garbage 2 is not transferred to the condensing tank 1. On the contrary, it is desirable that the material of the condensing tank 1 has high heat conductivity because the amount of condensation increases. For example, stainless steel (SUS430, plate thickness 1mm)
In a rotating container made of steel, the outside temperature is 80 ° C, and the condensation rate (the rate of condensation of generated water vapor) is about 50%, but in a vacuum-insulated double stainless container, the outside temperature is 40 ° C, % Of water is condensed, the odor component is also reduced in proportion to this, and the odor in the exhaust path is also reduced. It was somewhere in the middle for plastic heat insulating materials. The most desirable in this sense is a vacuum-insulated double stainless steel container.

The radiation of heat from the rotary container to the condensing tank 1 is a waste of microwaves, but in this respect as well, the rotary container 4 with heat insulation can save electricity consumption.

A part of the water vapor generated in the rotary container is condensed also in the condensation lid 12, but if the condensation lid is constructed obliquely as in the present invention, all the condensed moisture flows down to the condensation tank 1. When the water drops fall into the rotary container 4, this vaporization consumes microwave energy again and is wasted. Therefore, the condensing lid 12 must be inclined toward the condensing tank 1 at least on the vertical extension of the rotary container 4. Further, although the heating means is a microwave in this embodiment, hot air may be used as a simpler device. The same effect can be obtained by blowing hot air into the rotary container 4 from above.

The progress of drying depends on the temperature of the temperature detecting portion 19 provided above the rotary container 4 or the weight change of the food waste 2.
It is detected by means such as a change in humidity of the condensing tank 1. If the microwaves are stopped so that electricity is not wasted due to overheating according to this signal, the processing ends.

[0015]

As described above, according to the present invention, the material to be dried becomes less likely to be dried and rotted, and the weight and volume are reduced with less power consumption. In addition, the separated water-containing organic matter does not pollute sewage. Alternatively, since most of the generated steam is condensed, the generation of odor is extremely small.

[Brief description of drawings]

FIG. 1 is a sectional view of a heating and drying apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 1 Condensation tank 2 Garbage 3 Lid 4 Rotating container 5 Microwave oscillator 14 Blower

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunihiro Ukai 1006 Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. An inclined rotary container for storing food waste, a heating means for heating the food waste in the rotary container, a condensing section provided around the rotary container, and a cooling means for the condensing section. And a communication part between the rotary container and the condensing part, wherein the heat conduction in the thickness direction of the wall material of the rotary container is smaller than the heat conductivity of the wall material of the condensing part. 2. The heating / drying apparatus according to claim 1, wherein the heating means is a microwave.