JP2002350061A - Hot-air rotary drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-air rotary drier of a simple structure, which shortens drying time and improves drying efficiency by effectively heating and peeling an object to be treated, which has stuck to the inner wall of a drum. SOLUTION: The hot-air rotary drier is provided with a rotary drum 2 to which wet refuse is consecutively inputted, and a hot air supplying device 3, which is disposed in the drum 2, for supplying hot air thereto. An induction heating apparatus 4 that serves as a noncontact heater is provided at the side of a wet refuse input port of the drum 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-air rotary dryer. The present invention is particularly intended to efficiently dry high-moisture-content and highly-sticky food residues such as soybean meal and peel sludge.

[0002]

2. Description of the Related Art In recent years, recycling of garbage has become an important issue in environmental measures, and instead of conventional incineration and landfill treatment, attention has been paid to bioprocessing and drying treatments that can reuse garbage. Have been.

[0003] In addition to the rising costs of collecting and disposing of garbage, there has been a change in managerial consciousness toward the acquisition of ISO 14001, and food processing factories, food service industries, food service centers, hospitals, welfare facilities, etc. The market size of commercial garbage disposers targeted at is increasing year by year.

[0004] Commercial garbage processing machines employ a bio-method in which garbage is decomposed by using microorganisms or a carbonization treatment system in which garbage is heated to high temperature to be carbonized to convert garbage into compost. Is the current mainstream.

On the other hand, a large amount of garbage (vegetables, rice, meat, fried foods, pasta, etc. as food residues) is generated in food processing factories, bento / delivery factories, and the like. In supermarkets and convenience stores, expired foods are collected by a delivery vehicle from a store to a collection place and then discarded, so that the expired foods become garbage. In recent years, in food processing factories and stores, garbage is thoroughly stored and refrigerated, and the quality of garbage is good, and garbage is not dirty or decomposed.

[0006] When composting high-quality garbage generated in food processing factories and the like, the added value is low (the compost price is low). However, adding garbage to feed instead of compost will add value. In other words, if a dried product obtained by drying garbage can be used as a raw material for a compound feed, resources can be effectively used, and the dried product can be recycled and used as an expensive product (raw material for a compound feed). is there. It can also contribute to increasing the self-sufficiency of livestock feed, which is mainly imported.

[0007] By the way, in order to convert raw garbage into feed for livestock, it is necessary to dry the raw garbage excessively and uniformly dry it to an optimum water content without carbonizing.

Therefore, it has been proposed to dry garbage of good quality by a rotary drum type dryer, a tray type dryer or a tunnel type dryer.

Here, a hot air rotary dryer as a conventional rotary drum dryer will be outlined with reference to FIG. As shown in FIG. 4, in the conventional hot-air rotary dryer 01, raw garbage, which is an object to be processed, is charged into a rotating drum 02 via a charging pipe 03. When the input of the garbage is completed, the rotary drum 02 rotates continuously, and hot air is supplied from the hot air inlet 04 into the rotary drum 02. The hot air is supplied in a counter-flow system along the drum rotation axis of the rotating drum 02,
It is discharged from the hot air outlet 05.

The garbage is lifted up along the circumferential direction by a lifter blade 06 arranged in the rotating drum 02, and falls downward from above when approaching the top in the circumferential direction. Therefore, the garbage is heated and dried while being efficiently contacted with the hot air while being stirred in the rotating drum 02. heating·
The dried garbage is discharged from the payout port 07.

[0011]

However, in the above-described conventional hot-air rotary dryer, a high-moisture-content, highly-adhesive material to be processed (soybean cake, peel sludge, etc.) is continuously fed. When thrown in, there was a problem that sticking to the inner wall of the drum near the slot. Once sticking, the temperature of the drum wall is low and a dry film is formed on the surface and the wall side is not contacted with hot air, so that the drying hardly progresses in some cases, and the drying efficiency is significantly reduced.

As a countermeasure, a method may be considered in which a jacket through which a heat medium such as steam is circulated is attached to the outside of the drum and external heating is also used. There are problems in that the method of supplying the medium, the method of rotating and sealing the jacket and the drum are technically difficult, and the structure is complicated.

The present invention has been proposed in view of the above-mentioned prior art, and has a simple structure to effectively heat and peel off an object stuck to the inner wall of the drum, thereby shortening the drying time and improving the drying efficiency. An object is to provide a hot-air rotary dryer.

[0014]

According to the present invention, there is provided a hot-air rotary dryer provided with a hot-air supply device for supplying hot air to a rotary drum into which objects to be processed are continuously fed. A non-contact heater is provided on the workpiece input side of the rotary drum.

Further, the non-contact heater is an induction heating device provided around a rotary drum.

The non-contact heater is a microwave oscillator having a waveguide inserted in a dryer hood.

Further, a microwave transmitting portion is provided on a partition plate between the dryer hood and the rotary drum.

Further, a scraper for scraping an object to be processed on the inner wall of the drum is provided on the side of the rotary drum toward which the object to be processed is inserted.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a hot-air rotary drier according to the present invention will be described in detail with reference to the drawings using embodiments.

[First Embodiment] FIG. 1 is a schematic configuration diagram of a hot-air rotary dryer showing a first embodiment of the present invention.

As shown in FIG. 1, the hot air rotary dryer 1
Is composed mainly of a rotary drum 2, a hot-air supply device (hot-air generating furnace) 3, and an induction heating device 4 as a non-contact heater, and serves as an object (raw material) charged into the rotary drum 2. Is heated directly by hot air from the hot air supply device 3 and indirectly heated by the induction heating device 4 via the outer wall of the drum to be dried.

The rotating drum 2 is rotatably supported on rotating rollers 6a and 6b via a pair of ring members (referred to as tires) 5a and 5b fitted on the outer peripheral surface of the drum, and is connected to the rotating roller 6b. The drive motor 7 rotates forward and backward. A lifter blade and a spiral blade (not shown) are provided on the inner peripheral surface of the rotary drum 2.

A partition plate 8 is provided at one end opening of the rotary drum 2.
The fixed chamber 9a is communicated with the power supply through a fixed chamber 9a, and a hot air inlet 10 is provided at an upper portion of the fixed chamber 9a. Also,
A screw feeder 11 penetrates through the center of the fixed chamber 9a. A tip end of the screw feeder 11 enters the rotary drum 2 and a garbage hopper 12 is provided at a base end.

A fixed chamber 9b is connected to the opening of the other end of the rotary drum 2, and a hot air outlet 13 is provided at the center of the fixed chamber 9b. Also, the fixed chamber 9b
At the lower part of the garbage, there is provided an outlet 14 for dry garbage, and the dried garbage discharged from the outlet 14 is conveyed to a dry product hopper 15 for storage.

The hot air supply device 3 is configured such that a fuel gas such as LPG and combustion air are supplied to a burner 16 at a predetermined ratio, and the combustion gas is blown into a furnace 17. The hot air outlet 13 is provided at the end of the furnace 17 on the burner 16 side.
The hot air discharged from the furnace is returned to the furnace 17 via the cyclone separator 18 and the circulation blower 19. A part of the hot air from the hot air outlet 13 (a gas amount corresponding to steam generated from combustion gas and garbage) is exhausted to the outside air. The hot air generated in the furnace 17 is sent to the hot air inlet 10 and supplied into the rotary drum 2. In this way, the hot air flows from the furnace 17 → the rotary drum 2 → the cyclone separator 18 → the furnace 17 and is circulated. In FIG. 1, reference numeral 20 denotes a combustion blower, and reference numerals 21a and 21b denote valves.

The induction heating device 4 includes the rotary drum 2
Is provided at a part of the periphery of the one end opening side (the raw material charging port side) to indirectly heat the garbage charged into the rotary drum 2 via the drum wall surface.

With this configuration, the rotating drum 2
When the garbage in the charging hopper 12 is continuously loaded into the rotary drum 2 via the screw feeder 11,
Are continuously rotated by the drive motor 7, for example, and the garbage is stirred. During this time, hot air generated in the furnace 17 of the hot air supply device 3 is supplied into the rotary drum 2 from the hot air inlet 10 in a parallel flow manner, and the garbage is heated and dried.

At this time, the garbage that has a high water content and adheres to the inner peripheral wall at the one end opening side of the rotary drum 2 is effectively supplied with heat by conduction heat transfer from the drum wall by the induction heating device 4, Drying proceeds. Thereby, the garbage adhering to the inner peripheral wall is promptly peeled off from the wall surface, and is effectively brought into contact with the hot air in the rotating drum 2 to be dried.

As a result, the thermal efficiency of the hot-air rotary dryer 1 is greatly improved, uniform drying is achieved, the drying time is shortened, and the drying efficiency is dramatically improved.

Even if high-temperature hot air (100 ° C. or higher at the hot-air outlet 13) is fed in parallel as described above, if the raw garbage has a high water content, the temperature of the raw garbage is wet. Since it does not rise above the bulb temperature, it does not burn and can be rapidly heated and dried in combination with induction heating.

The surface layer dries quickly, is transported quickly to the hot air outlet 13 by hot air flow, and is collected by the cyclone separator 18. Thereby, the contact between the undried portion and the hot air increases, and the drying efficiency is further improved.

The heated and dried garbage is discharged from the payout port 14, conveyed to the dried product hopper 15, and stored. On the other hand, the hot air flowing in the rotary drum 2 in a parallel flow manner is discharged from the hot air outlet 13, and after the residual garbage is collected by the cyclone separator 18, a part of the hot air is exhausted to the outside air. As described above, the gas is returned into the furnace 17 of the supply device 3 and mixed with the combustion gas from the burner 16 to be circulated and ventilated.

In this embodiment, since the induction heating device 4 can be provided in a non-contact manner, the structure can be simplified.

[Second Embodiment] FIG. 2 is a schematic structural view of a hot-air rotary dryer showing a second embodiment of the present invention.

This is an example in which a scraper 22 is fixed to the outer periphery of the distal end portion of the screw feeder 11 in the first embodiment, and garbage stuck to the inner peripheral wall of the rotary drum 2 is forcibly scraped. Other configurations are the same as those of the first embodiment, and therefore, in FIG. 2, the same members as those in FIG.

According to this, the garbage stuck to the inner peripheral wall of the rotary drum 2 can be positively peeled off by the cooperation of the scraper 22 and the induction heating device 4. Other effects are the same as those of the first embodiment. In this case, it is preferable to adopt a structure in which the distal end of the scraper 22 is pressed against the inner peripheral wall of the rotary drum 2 by the urging force of a spring or the like.

[Third Embodiment] FIG. 3 is a schematic structural view of a hot-air rotary dryer showing a third embodiment of the present invention.

This is because a microwave oscillator 2 is used as a non-contact heater instead of the induction heating device 4 in the first embodiment.
This is an example using No. 3. That is, the waveguide 24 of the microwave oscillator 23 is inserted into the fixed chamber (dryer hood) 9a, the microwave is transmitted through the partition plate made of the Teflon (registered trademark) plate 8A, and is injected into the rotary drum 2. Irradiated garbage was quickly heated. Other configurations are the same as those of the first embodiment, and therefore, in FIG. 3, the same members as those in FIG.

According to this, the garbage stuck to the inner peripheral wall of the rotating drum 2 can be positively peeled off by cooperation of the scraper 22 and the microwave oscillator 23. Other effects are the same as those of the first embodiment.

The present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0041]

As described above, according to the first aspect of the present invention, there is provided a hot-air rotary dryer having a hot-air supply device for supplying hot air to a rotary drum into which objects to be processed are continuously charged. Since a non-contact heater is provided on the workpiece inlet side of the rotary drum, the workpiece stuck to the inner wall of the drum is effectively heated and peeled with a simple structure to shorten the drying time and reduce the drying efficiency. Improvement can be achieved.

According to the second aspect of the present invention, since the non-contact heater is an induction heating device provided around the rotary drum, heat is effectively transferred by conduction heat transfer from the drum wall. And drying can be advanced, and the apparatus can be easily installed without contact.

According to the third aspect of the present invention, since the non-contact heater is a microwave oscillator having a waveguide inserted into a dryer hood, the object to be processed is rapidly heated by microwaves and dried. And the oscillator can be easily installed in a non-contact manner.

According to the fourth aspect of the present invention, since the microwave transmitting portion is provided on the partition plate between the dryer hood and the rotary drum, it is not necessary to insert the tip of the waveguide into the rotary drum. The interference of the garbage being stirred is avoided.

According to the fifth aspect of the present invention, since the scraper for scraping the workpiece on the inner wall of the drum is provided on the workpiece inlet side of the rotary drum, the workpiece stuck to the inner peripheral wall of the rotary drum can be removed. Forcibly scraped off, the operation and effect of the invention of claim 1 are further promoted.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hot air rotary dryer showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a hot-air rotary dryer showing a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a hot-air rotary dryer showing a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional hot air rotary dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot-air rotary dryer 2 Rotary drum 3 Hot-air supply device 4 Induction heating device 5a, 5b Ring member 6a, 6b Rotary roller 7 Drive motor 8 Partition plate 8A Teflon plate 9a, 9b Fixed chamber 10 Hot-air inlet 11 Screw feeder 12 Input hopper 13 Hot air outlet 14 Outlet 15 Dry hopper 16 Burner 17 Furnace 18 Cyclone separator 19 Circulating blower 20 Combustion blower 21a, 21b Valve 22 Scraper 23 Microwave oscillator 24 Waveguide

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F26B 25/04 B09B 3/00 303M 303N (72) Inventor Yuji Asahara 4-6 Kannon Shinmachi, Nishi-ku, Hiroshima, Hiroshima Prefecture No. 22 Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory F-term (reference) 3L113 AA06 AB03 AB05 AB07 AC04 AC07 AC45 AC46 AC58 AC62 AC63 AC68 AC86 BA03 BA16 DA01 DA10 DA13 DA16 4D004 AA02 AA03 AA46 AC04 BA04 CA15 CA42 CB09 CB33 CB36 CB42 A01 BD11 BD12 BD22 BD26 BK30 CA14 CB01 CC02

Claims (5)

[Claims] 1. A hot air rotary drier provided with a hot air supply device for supplying hot air into a rotary drum into which an object to be processed is continuously charged, wherein a non-contact heating is provided on a side of the rotary drum toward an object to be processed. A hot air rotary dryer characterized by having a vessel. 2. The hot air rotary dryer according to claim 1, wherein the non-contact heater is an induction heating device provided around a rotary drum. 3. The hot air rotary dryer according to claim 1, wherein the non-contact heater is a microwave oscillator having a waveguide inserted in a dryer hood. 4. The hot air rotary dryer according to claim 3, wherein a microwave transmitting portion is provided on a partition plate between the dryer hood and the rotary drum. 5. The hot-air rotary dryer according to claim 1, wherein a scraper for scraping an object to be processed on an inner wall of the drum is provided on the side of the rotary drum toward which the object to be processed is inserted.