JP2001079510A - Waste treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste treating device which hardly generates toxic substances such as dioxins due to high temperature heating treatment, is suitable for continuous drying carbonizing treatment of waste, can realize great volume reduction of the waste and further can recycle the waste as a resource or can reuse the waste. SOLUTION: The waste treating device is provided with a drier 2 and a carbonizer 4 each of which has a double cylinder structure where waste such as organic waste is accommodated in an inner cylinder and hot air is introduced in an outer cylinder, a hot air furnace 5 sending hot air into respective outer cylinders of the drier 2 and the carbonizer 4, a deodorizing furnace 3 deodorizing exhaust gas such as odor and steam generated during drying treatment in the drier 2 by heating and burning and a cooler 6 cooling carbonized products of high temperature which is carbonized in the carbonizer 4 and is discharged therefrom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment apparatus for promoting the reduction and recycling of waste, and more particularly, to the pretreatment such as charging, crushing, and sorting of organic waste including garbage. From heating and drying, deodorization, carbonization, cooling, bagging,
The present invention relates to a suitable waste treatment apparatus when applied to continuous treatment of organic waste that is continuously performed up to carrying out.

[0002]

2. Description of the Related Art Conventionally, organic waste including garbage has been discharged in large quantities following paper and cloth. However, with regard to recycling, recycling of paper and cloth and recycling. While the system is almost established, only a part is recycled, and most of it is reduced by incineration. Recently, it has been found that smoke and effluents generated from waste incineration plants contain toxic substances such as highly toxic dioxins, and improvement and review of existing incineration methods are urgently needed. .

[0003]

SUMMARY OF THE INVENTION In view of the above situation, the present invention makes it difficult to generate harmful substances such as dioxin by high-temperature heat treatment, and is suitable for continuous dry carbonization of waste. It is an object of the present invention to provide a waste treatment apparatus which can realize a great reduction in weight and can recycle and reuse waste.

[0004]

In order to achieve the above object, a waste treatment apparatus according to the present invention accommodates waste such as organic waste in an inner cylinder and introduces hot air into an outer cylinder. A dryer and carbonizer with a double-cylinder structure, a hot blast stove that sends hot air to the respective outer cylinders of the dryer and carbonizer, and heat combustion of exhaust gas such as odor and water vapor generated during the drying process in the dryer. It comprises a deodorizing furnace for deodorizing by heating, and a cooler for cooling high-temperature carbides carbonized and discharged in the carbonizer as main components.

[0005] In the waste treatment apparatus according to the present invention, the structural body includes means for increasing the internal pressure of a storage section for storing the processing waste to a pressure higher than the atmospheric pressure.

[0006] A processing machine according to the present invention is provided with a hollow shaft through which hot air can be introduced, in a processing machine which performs at least one of drying and carbonization of waste.

[0007] In the apparatus according to the present invention, a screw conveyor is provided in the processing machine, and the hollow shaft is a screw shaft.

[0008] The apparatus according to the present invention is an exhaust gas deodorizer, in which an exhaust gas outlet is disposed near the air inlet of an air supply pipe partially formed in a throttle shape, thereby utilizing the venturi effect. The exhaust gas is introduced into the furnace of the deodorizer.

In the apparatus according to the present invention, an exhaust gas transfer pipe, which is partially formed in a narrowed shape, is disposed between a waste drying treatment machine and an exhaust gas deodorization treatment machine. The exhaust gas generated in the above is introduced into the deodorizing treatment machine utilizing the Venturi effect.

[0010] The apparatus according to the present invention is provided with means for circulating the carbonized gas recovered from the waste carbonizer to the hot air generator.

An apparatus according to the present invention is a hot air generator, wherein a carbonization gas pipe outlet is disposed near an air supply pipe outlet partly formed in a throttle shape, and thus carbonization utilizing the Venturi effect. The gas is introduced into the furnace of the hot air generator.

In the apparatus according to the present invention, a double damper is provided between the drying chamber and the carbonization chamber, so that when the dried material enters the primary damper from the drying chamber, the primary damper is opened and the secondary damper is opened. When the dry matter enters the carbonization chamber from the primary damper into the carbonization chamber, the primary damper is controlled to be "closed" and the secondary damper is controlled to be "open".

The cooler according to the present invention has a double cylinder structure in which carbide is contained in the inner cylinder and cooling water is sent to the outer cylinder.
The inner cylinder is provided with a hollow shaft for sending cooling water.

The cooler according to the present invention is such that a screw conveyor is provided in the inner cylinder of the cooler, and the hollow shaft is a screw shaft.

[0015]

The present invention will be described below. In the actual processing operation, first, waste introduced into the inner tube (drying chamber) of the dryer is indirectly heated and dried by hot air (external heat) introduced into the outer tube of the dryer from the hot air generator. You. And
Exhaust gas such as odor and steam gas generated during the drying process in this drying chamber is sent to a deodorizing furnace, where it is burned and oxidized to be deodorized. The dried waste is sent to the inner cylinder (carbonization chamber) of the carbonizer as dried waste. Then, the dried waste stored in the carbonization chamber is indirectly heated and carbonized by the hot air (external heat) introduced from the hot air generator into the outer cylinder of the carbonizer from the hot air generator and turned into powder, which is then transferred to the cooler. Sent. Then, the carbonized powder cooled in the cooler is discharged out of the machine, and then packed in a bag and carried out.

In addition, the above-mentioned structure is provided with means for increasing the internal pressure of the storage section for storing waste above atmospheric pressure, thereby preventing outside air from flowing into the storage section and preventing fire and explosion. .

In addition, since a hollow shaft through which hot air can be introduced is provided in a processing machine in which at least one of drying and carbonization of waste is performed, the waste is heated by hot air in the hollow shaft.
Heat treatment can be performed efficiently with strong external heat generated by hot air from the outer cylinder. If a screw conveyor for stirring and moving is installed in the processing machine and the screw shaft is a hollow shaft, stirring and moving can be performed simultaneously.

Further, a part of the exhaust gas transfer pipe is arranged in a throttle shape between the waste drying apparatus and the exhaust gas deodorizing apparatus, and the exhaust gas is introduced into the deodorizing apparatus using the venturi effect. ing. Further, in the deodorizer, an exhaust gas pipe outlet is disposed near the outlet of the air supply pipe which is partially formed in a throttle shape, so that the exhaust gas is introduced into the furnace of the deodorizer using the venturi effect. ing.

Further, by providing a means for circulating the dry distillation gas recovered from the waste carbonizer to the hot air generator, the fuel consumption can be greatly reduced, and the dry distillation gas is burned and deodorized. . And in this case, if the carbonized gas pipe outlet is arranged near the outlet of the air supply pipe, which is partially formed in a throttle shape, the carbonized gas is smoothly supplied to the hot air generator by utilizing the venturi effect. Can be introduced.

In addition, a double damper is provided between the drying chamber and the carbonization chamber, and when a dried product enters the primary damper from the drying chamber, the primary damper is opened, the secondary damper is closed, and the primary damper is closed. By controlling the primary damper to be 'closed' and the secondary damper to be 'open' when dry matter enters the carbonization chamber from the damper, air flowing from the drying chamber to the carbonization chamber, and from the carbonization chamber to the drying chamber Each hot gas flowing to the building is minimized to prevent fires and explosions.

The cooler has a double cylinder structure in which carbide is accommodated in an inner cylinder and cooling water is sent to an outer cylinder.
If the hollow shaft for sending the cooling water is provided, the high-temperature carbide can be efficiently cooled by the cooling water in the hollow shaft and the cooling water in the outer cylinder. If a screw conveyor for stirring and moving is attached to the inner cylinder and the screw shaft is a hollow shaft, stirring and moving can be performed simultaneously with cooling.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. In the figure, a waste treatment apparatus 1 according to the present invention has a drier 2, a deodorizing furnace 3, a carbonizer 4, a hot air generating furnace 5, and a cooler 6 as main components. Dryer 2
Are a drying chamber (inner cylinder) 8 for storing waste 7, an outer cylinder 9 into which hot air is introduced from a hot-air generating furnace 5, and a screw conveyor 10 provided inside the drying chamber 8 for stirring and transfer (preferably, The screw conveyor shaft 11 has a hollow shaft structure, and hot air is introduced from the hot air generating furnace 5 into the hollow portion 12 of the screw conveyor shaft 11. The deodorizing furnace 3 comprises an inner cylinder 14 and an outer cylinder 15, and the inner cylinder 14 has a burner 16, a wind box 1 for storing air sent from a blower (not shown).
7.The air supply pipe 1 that connects the wind box 17 with the inside of the furnace, becomes a flow path for dilution air, and is partially formed in a throttle shape
8. Exhaust gas such as odor and water vapor generated in the drying chamber 8 is transferred to the gas box 19 of the deodorizing furnace 3, and the exhaust gas transfer pipe 20, which is partially formed in the shape of a throttle, connects the gas box 19 to the inside of the furnace and exhaust gas. It comprises an exhaust gas pipe 21 having a pipe outlet disposed near the outlet of the air supply pipe 18 and serving as a flow path, a combustion chamber 22 in which exhaust gas is burned, a catalyst layer 23, and the like. Further, dilution air is introduced from a blower (not shown) into an air conduit 24 formed between the inner and outer cylinders, and is injected into the inner cylinder 15 through an opening 25. Reference numeral 26 denotes a burner blower that sends fuel to the burner 16, and reference numeral 27 denotes a blower that supplies air into the exhaust gas transfer pipe 20. The carbonizing machine 4 includes a carbonizing chamber (inner cylinder) 31 for heating and carbonizing the dried waste sent from the dryer 2.
Screw conveyor for stirring and transfer provided inside
32 (preferably, for example, a paddle screw having an impact breaking effect is used). The screw conveyor shaft 33 has a hollow shaft structure, and its hollow portion 34
Hot air is introduced into the outer cylinder 35 from the hot air generator 5.
Then, the carbonized gas recovered by the carbonizer 4 is supplied to the carbonized gas transfer pipe.
The gas is sent to the gas box 46 of the hot air generator 5 via 36 and reused as fuel. In addition, a double damper 37 is provided between the drying chamber 8 and the carbonization chamber 31, so that when the dried material enters the primary damper from the drying chamber 8, the primary damper is opened and the secondary damper is closed. , And when the dry matter enters the carbonization chamber 31 from the primary damper, the primary damper is controlled to be “closed” and the secondary damper is controlled to be “open”. The hot-air generating furnace 5 includes an inner cylinder 41 and an outer cylinder 42. The inner cylinder 41 includes a burner 43, a wind box 44 for storing air sent from a blower (not shown), and a wind box.
An air supply pipe 45 which connects the inside of the furnace with the inside of the furnace 44 and serves as a flow path for dilution air, and a part of which is formed in a throttle shape, a gas box 46 for containing the carbonized gas generated in the carbonization chamber 31, And a dry distillation gas pipe 47 having a pipe outlet disposed near the outlet of the air supply pipe 45, and the dilution air is passed through an air conduit 48 formed between the inner and outer cylinders. It can be supplied to the inner cylinder 41 from the opening 49. The cooling machine 6 includes a cooling chamber (inner cylinder) 51 for containing carbides,
An outer cylinder 52 into which the cooling water is introduced, a screw conveyor 53 (preferably, for example, a short pitch screw may be used) for stirring and transfer provided in the cooling chamber 51, and the like, and the screw conveyor shaft 54 is hollow. A shaft structure is provided, and cooling water can flow into the hollow portion 55.
Incidentally, single dampers 58 and 59 are provided between the carbide inlet 56 of the cooler and the carbonization chamber 31 and the cooling chamber outlet 57 after cooling, respectively, to eliminate adverse effects on the temperature and pressure inside the cooling chamber. Therefore, both dampers 58 and 59 do not release at the same time.

The processing procedure of the above embodiment will be described below.
First, the organic waste 7 including garbage is put into the receiving hopper 60 and crushed by the crusher 61. Then magnetic sorter 62
The ferrous metal is sorted out and removed, and only the remaining organic waste is transported by the conveyor 63 and the distribution conveyor 64 and put into the dryer 2. At this time, the temperature, amount, and processing time of the hot air to be introduced into the outer cylinder 9 and the hollow portion 12 of the screw conveyor shaft 11 are set according to the type of waste. Usually 200
Heat the waste in the inner cylinder by setting the external heat to between C and 400C and dry it. Further, the waste is dried while being agitated and moved by the screw conveyer 10 to become a dried waste, and travels through the drying chamber 8 to the outlet. Exhaust gas such as odor and water vapor generated inside the drying chamber 8 is introduced from the drying chamber 8 through the exhaust gas transfer pipe 20 into the gas box 19 of the deodorizing furnace 3. A part of 20 is formed in a throttle shape and disposed, and the flow of the exhaust gas is promoted and introduced into the gas box 19 using the Venturi effect. Further, with respect to the introduction of the exhaust gas from the gas box 19 into the furnace, the exhaust gas is injected from the exhaust gas pipe 21 into the furnace by the Venturi effect of the air flow of the air supply pipe 18.
Then, in the combustion chamber 22, the exhaust gas is oxidized and burned by the burner 16 usually at 850C to 1200C. Further, dilution air from the air conduit 24 is injected into the exhaust gas that has proceeded to the latter half of the deodorization furnace 3 through the opening 25, and the diluted air converts the high-heat exhaust gas to a temperature 400 with which the catalyst layer 23 of platinum or platinum-palladium can withstand. After the temperature is lowered to about C, the unburned gas and odorous gas are oxidized and deodorized by passing through the catalyst layer 23. The gas that has passed through the catalyst layer 23 moves to an exhaust process. On the other hand, the dried waste is stored in the carbonizing chamber 31 of the carbonizing machine 3 from the drying chamber 8 outlet through the double damper 37. That is, when the dried waste enters the primary damper from the drying chamber 8, the primary damper is 'open', the secondary damper is 'closed', and when the waste enters the carbonization chamber 31 from the primary damper, the primary damper is 'closed'. ',
The secondary damper passes controlled to be 'open'.
This is because the air flowing from the drying chamber 8 to the coking chamber 31 when the dried waste moves from the drying chamber 8 to the coking chamber 31 and the coking chamber
This is to prevent the fire and explosion by minimizing the hot gas flowing from 31 to the drying chamber 8 respectively. And the carbonization chamber
The dried waste stored in 31 is heated by a hot air introduced into the outer cylinder 35 and the hollow portion 34 of the screw conveyor shaft 33 from the hot air generating furnace 5 while being stirred and moved by the screw conveyor 32, usually at a temperature of 600 ° C. or more. Heated by external heat and carbonized. The hot-air generating furnace 5 burns and generates a high-temperature gas for heating the drying chamber 8 and the carbonization chamber 31, and uses the burner 43 as a main fuel, such as a gas or oil supplied by a burner blower 65, as a fuel. Combustion occurs, and the carbonized gas recovered from the carbonizer 4 is also effectively used as fuel. The carbonization gas is injected into the furnace from the carbonization gas pipe 47 by the Venturi effect of the air flow of the air supply pipe 45, which is partially formed in a throttle shape. For hot air temperature,
Normally, 1200 ° C at the time of occurrence is standard. In the latter half of the hot-air generating furnace 5, dilution air from an air conduit 48 is injected through an opening 49, and the hot air is reduced to a predetermined temperature by the dilution air before being sent to a flow rate controller 66. In the flow control device 66, the amount and temperature of hot air are controlled by the flow control partition 67 and the cooling blower 68, and the dryer 2
To the carbonizer 3. In this embodiment, as described above, the drying chamber 8 is adjusted to have an external heat of 200 ° C. to 400 ° C., and the carbonization chamber 31 is adjusted to have an external heat of 600 ° C. or more. The high-temperature carbide heated and carbonized by the carbonization machine 4 is subjected to single damper
It is stored in the cooling chamber 51 from the carbide inlet 56 through 58.
Then, in the cooling chamber 51, the carbide is cooled by the cooling water introduced into the outer cylinder 52 and the hollow portion 55 of the screw conveyor shaft while being stirred and moved by the screw conveyor 53, and discharged from the cooling chamber outlet 57 through the single damper 59. Is done. After that, they are bagged by a bagging machine and carried out. Normally, the volume of garbage is reduced in the dryer to one-half to one-fifth of the original dry waste, and further in the carbonizer, one-tenth to one-twentieth of the harmless carbonization. It becomes a powder. This carbonized powder may also be a by-product that can be reused.

As described above, the above-mentioned structure is a means for increasing the internal pressure of the storage section for storing waste and the like above the atmospheric pressure, that is, the dryer 2, the deodorizing furnace 3, the carbonizer 4, and the hot-air generating furnace 5. The cooler 6 has a double-cylinder structure in order to maintain airtightness, and is equipped with equipment capable of setting the internal temperature higher than that of the outside air. Thus, if the internal temperature is always set higher than the outside air during the operation, the internal pressure is maintained higher than the atmospheric pressure, the outside air is prevented from flowing into the accommodation section, and the fire and explosion can be prevented. In the above embodiment, the present invention is applied to all the components, that is, the means for increasing the internal pressure of the storage unit for storing wastes, etc., is higher than the atmospheric pressure. However, the present invention is applied to only some of the components. However, other techniques for preventing fire and explosion may be used for other components.

In the above embodiment, the dryer 2 and the carbonizer 4 are described as the dryer for drying the waste or the carbonizer for carbonizing. However, the present invention, that is, the hot air can be introduced. The technology of providing a hollow shaft or providing a screw conveyor and using a hollow shaft as a screw shaft is described in the dryer 2 and the carbonizer 4 shown in the embodiment.
The present invention is not limited to this, and may be applied to any type of drying or carbonizing machine. The application target is not limited to the externally-heated waste treatment device.

Further, the present invention, that is, the technique of recirculating the combustible carbonized gas recovered from the waste carbonizer to the hot air generator is limited to the carbonizer 4 and the hot air generator 5 shown in the embodiment. Instead, the present invention may be applied to any structure of a carbonization processor and a hot air generator.

Furthermore, the present invention, that is, the technical configuration in which the double damper 38 is provided between the drying chamber 8 and the carbonizing chamber 31 can be applied to any structure of the drying chamber and the carbonizing chamber.

Further, in the present invention, the air supply pipe and the like are formed in a throttle shape and the venturi effect of the air flow is utilized. However, the throttle shape is not limited to the embodiment, and any shape can be used as long as the venturi effect occurs. Of course, such an aperture shape is acceptable.

[0029]

As described above, according to the present invention, by providing excellent blast furnace pressure combustion processing equipment, air supply equipment, and gas supply equipment, air necessary for combustion can be effectively supplied. A remarkable effect is obtained in which mixing of fuel and combustion air can be effectively performed. Further, in the hot-air generating furnace, the odor contained in the combustible carbonized gas recovered and refluxed from the carbonization chamber is oxidized and extinguished by high-temperature combustion at 850 ° C to 1200 ° C. On the other hand, 850 degrees C
Combustion at a high temperature of 1200 ° C. and a catalyst provide not only an extremely high deodorizing effect but also an effect of not generating harmful substances such as dioxin. In addition, dryers, carbonizers,
Since the cooler can process continuously, unlike the batch type, which completes every cycle, continuous processing can be performed for 24 hours, and from the pretreatment such as charging, crushing, and sorting of organic waste including garbage. Heating drying, deodorization, carbonization, cooling,
The present invention can be applied to continuous treatment of organic waste in which bagging and unloading are continuously performed. In the dryers, carbonizers and coolers, the same hot air and cooling water as the outer cylinder are passed through the hollow part of the screw shaft for agitating movement, so that the combustion effect and cooling effect are significantly increased. In addition to remarkable improvement in energy efficiency, reuse of carbonization gas can reduce fuel consumption and greatly reduce waste. Furthermore, harmless carbonized powder that is finally treated and generated by the waste treatment according to the present invention can be expected to be recycled and reused.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a waste disposal apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of a hot air generator.

FIG. 3 is a schematic configuration diagram of a dryer, a deodorizing furnace, and a carbonizer.

FIG. 4 is a schematic configuration diagram of a cooler. A- of hot air generator
FIG. 3 is a sectional view taken along line A.

FIG. 5 is a sectional view taken along line AA of the hot air generator.

FIG. 6 is a sectional view taken along the line BB of the deodorizing furnace.

FIG. 7 is a schematic side view of a waste disposal apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste treatment apparatus 2 Dryer 3 Deodorizing furnace 4 Carbonizer 5 Hot air generator 6 Cooler 7 Waste 8 Drying room (inner cylinder) 9 Outer cylinder 10 Screw conveyor 11 Screw conveyor shaft 12 Hollow part 14 Inner cylinder 15 Outer cylinder 16 Burner 17 Wind box 18 Air supply pipe 19 Gas box 20 Exhaust gas transfer pipe 21 Exhaust gas pipe 22 Combustion chamber 23 Catalyst layer 24 Air conduit 25 Opening 26 Blower for burner 27 Blower 31 Carbonization chamber (inner cylinder) 32 Screw conveyor 33 Screw conveyor Shaft 34 Hollow part 35 Outer cylinder 36 Carbonized gas transfer pipe 37 Double damper 41 Inner cylinder 42 Outer cylinder 43 Burner 44 Wind box 45 Air supply pipe 46 Gas box 47 Carbonized gas pipe 48 Air conduit 49 Opening 51 Cooling room (inner cylinder) 52 Outer cylinder 53 Screw conveyor 54 Screw conveyor shaft 55 Hollow part 56 Carbide inlet 57 Cooling chamber outlet 58 Single damper 59 Single damper 60 Input hopper 61 crusher 62 magnetic separator 63 conveyor 64 distributing conveyor 65 Burner blower 66 flow rate control device 67 flow rate adjustment for the partition piece 68 cooling blower 69 carbonization chamber outlet 70 or fire burner

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Nobuyoshi Makino 3-1-25 Tarumachi, Kohoku-ku, Yokohama-shi National Metal Industry Co., Ltd. F term (reference) 4D004 AA01 CA22 CA26 CA32 CA42 CA48 CB36 DA02

Claims (11)

[Claims] 1. A dryer and a carbonizer having a double cylinder structure in which waste such as organic waste is contained in an inner cylinder and hot air is introduced into an outer cylinder. A hot-air generating furnace that sends air to the outer cylinder, a deodorizing furnace that heats and combusts exhaust gases such as odors and water vapor generated by the dryer, and a cooler that cools the high-temperature carbides that are carbonized and discharged by the carbonizer. A waste treatment device provided as a main component. 2. The waste treatment according to claim 1, wherein the structural body includes means for increasing the internal pressure of the storage section for storing the waste above atmospheric pressure, thereby preventing outside air from flowing into the storage section. apparatus. 3. A processing machine for performing at least one of drying and carbonization of waste, wherein the processing machine is provided with a hollow shaft through which hot air can be introduced. 4. The processing machine according to claim 3, wherein a screw conveyor is provided in the processing machine, and the hollow shaft is a screw shaft. 5. An exhaust gas deodorizing apparatus, wherein an exhaust gas pipe outlet is disposed near an outlet of an air supply pipe partially formed in a throttle shape, and thus the exhaust gas deodorizing apparatus utilizes the venturi effect. Equipment to be introduced into the furnace. 6. An exhaust gas transfer pipe partially formed in a throttle shape is disposed between a waste drying treatment machine and an exhaust gas deodorization treatment machine, so that the exhaust gas generated in the waste drying treatment is venturied. A device that takes advantage of the effect and introduces it into the deodorizer. 7. An apparatus provided with means for circulating a dry distillation gas recovered from a waste carbonizer to a hot air generator. 8. A hot air generator, wherein a dry distillation gas pipe outlet is disposed near an outlet of an air supply pipe partly formed in a throttle shape, so that the dry distillation gas is generated using the venturi effect. Equipment to be introduced into the furnace. 9. A double damper is provided between the drying chamber and the carbonization chamber, so that when drying waste enters the primary damper from the drying chamber, the primary damper is 'open' and the secondary damper is 'closed', Also, when dry waste enters the carbonization chamber from the primary damper, the primary damper is controlled to be "closed" and the secondary damper is controlled to be "open". 10. A double cylinder structure containing a carbide in the inner cylinder and introducing cooling water to the outer cylinder,
A cooler provided with a hollow shaft into which cooling water is introduced. 11. A screw conveyor provided in an inner cylinder of the cooler, wherein the hollow shaft is a screw shaft.
The cooler according to 10.