JPH0443211A - Bean-curd refuse incinerator with hot air generating device - Google Patents

Abstract

PURPOSE:To perform a complete combustion of bean-curd refuse and improve a thermal efficiency by a method wherein a heat exchanging chamber having a blown air inlet port and a hot air flowing-out port is disposed at the outer circumference of a chimney passage and then a fluidized bed type furnace for blowing the heated air is attained. CONSTITUTION:A blower 44 is rotated to feed air of normal temperature to a heat exchanging chamber 36. A fluidized bed 18 is formed with particulate refractory material 20 and then the fluidized bed 18 is heated by an auxiliary burner 24. Air of normal temperature flowed into the heat exchanging chamber 36 is blown into an air box 14 under a heat exchanging operation with a chimney passage 26. Raw bean-curd refuse 35 is supplied into a discharged gas flow in the chimney passage 26, the bean-curd is transported to the first drying tower 46 and then the bean-curd drops as the first dry bean-curd 58. Separated hot gas is discharged into a hot air feeding pipe 52. The first dry bean-curd 58 is supplied into the hot air feeding pipe 52 with a high pressure air flow got from a blower 64 for air transportation, transported to the second drying tower 68 with a flow of hot gas from the first drying column 46 and then the bean-curd drops as the second dry bean-curd 86. The bean-curd is inserted into a combustion cylinder 10 with an air flow of high pressure from a blower 80 for air transportation and then burned at the fluidized bed 18.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for incinerating okara generated in the process of manufacturing tofu, and more specifically, an apparatus for incinerating okara generated in the process of manufacturing tofu, and more specifically, an apparatus for generating hot air using residual heat of exhaust gas generated during incineration. This invention relates to a bean curd incinerator that uses the generated hot air.

[Prior Art] In a method for producing tofu, first, raw soybeans are soaked in water to swell the raw soybeans. Next, add water to the water-absorbed soybeans and grind them using a crusher to create a different liquid. This liquid is put into a pot or pot and boiled to make bean porridge. Once the soybean porridge is cooked, it is immediately passed through a squeezer to separate it into soymilk and okara.

A coagulant is added to soy milk to coagulate it into tofu, but some of the okara is used for food, and most of it is used as feed. However, in recent years, in response to the mass consumption of tofu in urban areas, the number of suburban dairy farms has been rapidly decreasing due to the wave of urbanization, and the problem of oversupply of okara in urban areas has become serious. .

In other words, in the old days, okara could be sold to dairy farmers as feed for a certain price, but due to an oversupply of okara, it became nothing, and instead they had to pay money to take it away. The situation is as follows. Not only that, the excess okara that cannot be disposed of as feed must be disposed of as industrial waste, and the burden of waste fees, which are expected to increase in the future, may threaten the very existence of the tofu manufacturing industry. I was able to get it out.

Okara is the lees left after squeezing soy milk, and it is said that 75 kg of okara is produced from a 60 kg bale of raw soybeans. This okara consists of grain husk and fiber, and has a moisture content of approximately 83%.
%, but it is difficult to dry, and if okara is left as it is, it will immediately emit a bad odor. Also, the surface layer rots quickly, but it does not rot easily up to the 6th layer.

Therefore, the industry has been considering drying okara, and various proposals have been made, but no good solution has yet been found.

[Problem to be solved by the invention] The inventors did not stop at drying okara, but also considered incinerating it. However, since okara contains a large amount of water and is a ball-like powder mixture, it is difficult to incinerate it using normal methods. Therefore, the inventors used a fluidized bed with strong mixing and stirring, rapid heat transfer, and excellent reactivity, and also used the residual heat of exhaust gas to dry the okara balls in advance and break them apart. He came up with the idea of disentangling okara to make it easier to burn and then incinerating it, and first completed the invention of an incinerator with a drying device and filed a patent application (Japanese Patent Application No. 187941).

That is, the previous patent application discloses a combustion tube installed almost vertically, a perforated plate attached to the bottom of the combustion tube, a wind box installed under the perforated plate, and a wind box installed through the wind box. A fluidized bed incineration system comprising: a blower that blows air to the perforated plate; a granular refractory that forms a fluidized bed in the combustion cylinder by air blown up from the perforated plate; and an auxiliary burner attached to the combustion cylinder. The furnace is connected to a cyclone type drying device that utilizes the exhaust gas from the incinerator.

However, in the above proposal, since air at room temperature is blown from a blower to the perforated plate through a wind box, there is a problem in that the granular refractories that form the fluidized bed do not flow smoothly8. This is thought to be because air at room temperature has a relatively heavy specific gravity.

In addition, since the lower part near the perforated plate is cooled by the inflow of room temperature air, ignition of okara in the fluidized bed does not occur in the part near the perforated plate, and the combustion zone rises to a relatively high part. There is a problem. Therefore,
Depending on the moisture in the bean curd and the combustion conditions, sufficient incineration of the bean curd may not be completed within the combustion tube, and smoke may be generated from the flue.

Further, the temperature of the exhaust gas from the flue is about 900° C., and in the previous invention, a considerable amount of heat was dissipated from the flue into the air, so it was desired to improve the thermal efficiency.

The present invention was made to solve the above-mentioned problems of the okara incinerator related to the previous application, and it improves the flow of granular refractories and lowers the combustion zone generated in the fluidized bed. An object of the present invention is to provide a bean curd incinerator that can complete the combustion of bean curd and improve the thermal efficiency of incinerating bean curd.

[Means for Solving the Problem] The present inventors came up with the idea of recovering the heat dissipated from the flue, and by providing a heat exchange chamber around the outer periphery of the flue and heating the air from the blower. , the above problems were solved.

That is, the okara incinerator with a hot air generator of the present invention,
A combustion tube installed vertically, a perforated plate attached to the bottom of the combustion tube, a wind box provided under the perforated plate, and a flue for discharging exhaust gas from the combustion tube.
a heat exchange chamber provided on the outer periphery of the flue and having a blown air inlet and a hot air outlet; a blower that blows heated air to the perforated plate via the heat exchange chamber and the wind box; and the perforated plate. The gist of the present invention is to consist of a granular refractory that forms a fluidized bed in the combustion tube by the air blown up by the combustion tube, a dry okara supply pipe attached to the combustion tube, and an auxiliary burner attached to the combustion tube. .

The combustion tube used as an incinerator needs to be relatively tall and cylindrical.The perforated plate attached to the bottom of the combustion tube covers the entire bottom of the combustion tube. It is desirable that the holes be uniformly drilled with an appropriate density and size so that a fluidized bed can be formed by using a device composed of holes, and granular refractories may accumulate on the perforated plate during periods of wind cessation. Appropriate measures must be taken to prevent it from spilling out of the hole. The wind box is for uniformly blowing air to the perforated plate, and can have any suitable shape as long as it can achieve this purpose.

The granular refractory forming the fluidized bed may be any material as long as it has sufficient fire resistance at the combustion temperature of the fluidized bed; for example, silica, alumina, magnesia, etc. can be used, and the particle size thereof is about 0.8 to 21III. It is preferable that
This is because if it is less than 0.8 m, the okara will not be stirred sufficiently and there will be a lot of loss as it scatters into the flue.
This is because if it exceeds 1, a satisfactory fluidized bed will not be formed.

As for the heat exchange chamber formed around the outer periphery of the flue, it is sufficient to simply cover the flue with an iron plate. In addition, in order to improve the efficiency of heat exchange from the flue, appropriate fins may be attached to the flue.The blast air inlet is installed near the end of the flue, and the hot air outlet is located at the beginning of the flue. Alternatively, the blown air inlet may be attached to the starting end and the hot air outlet may be attached to the terminating end so that the blown air passes through the heat exchange chamber.

[Function] When air is blown onto the perforated plate by a blower through the heat exchange chamber and the wind box, a fluidized bed of granular refractories is formed in the combustion cylinder by the air blown up from the perforated plate. This fluidized bed is heated by an auxiliary burner. When the temperature rises to a high temperature of 600℃ or higher, dry okara is fed into the combustion tube from the dry okara supply pipe, and the incineration of the okara starts, and the temperature of the exhaust gas exhausted from the combustion tube to the flue reaches 900℃. Raise the temperature to around ℃.

However, room-temperature air from the blower flows into the air inlet of the heat exchange room, is heated by heat from the flue in the heat exchange room, becomes hot air of approximately 200°C, flows out from the hot air outlet, and enters the air box. It blows up through the perforated plate.

This heating of the blown air reduces the specific gravity of the air and improves the flow of the granular refractories. In addition, since the air blown up from the perforated plate is heated, the combustion zone of the bean curd in the fluidized bed is lowered, and the combustion distance is extended, so that the bean curd is completely combusted and the generation of exhaust gas smoke is prevented. Furthermore, heat exchange with the blown air in the flue significantly improves the thermal efficiency of bean curd incineration.

[Examples] Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of an embodiment of the device of the present invention.

The combustion tube 10 is a vertically long tube whose inner surface is covered with a refractory material, and is installed almost vertically. The lower part of the combustion tube 10 is slightly narrowed toward the bottom, and a perforated plate 12 with a large number of holes is attached to the bottom.
A wind box 14 is attached below 2. This wind box 1
One end of a hot air blast pipe 16 is connected to the side of 4.
Hot air is blown up from the perforated plate 12.

A sufficient amount of granular refractory material 20 is charged into the combustion tube 10 to form a fluidized bed 18 by the air blown up from the perforated plate 12 . Further, a dried okara supply pipe 22 is attached to the side surface of the fuel cylinder 10, and dried okara is fed into the combustion cylinder 10 from the okara drying device. Furthermore, combustion tube 1
0, an auxiliary burner 24 is attached to the wall of the fuel cylinder 10 facing the perforated plate 12 so as to heat the fluidized bed 18 formed on the perforated plate 12.

A flue 26 is attached to the upper part of the combustion tube 10 and connected to a cyclone-type okara drying device, so that the combustion tube 1
The exhaust gas from Okara passes through a flue 34 and flows into the okara drying apparatus. Also, near the end of the smoke M26, there is a raw okara supply pipe 28 and a rotary valve 30.
A raw okara supply device 27 consisting of a pressure feeding blower 34 and a raw okara hopper 32 is connected thereto. A raw okara hopper 32 is attached to the raw okara supply pipe 28 via a rotary valve 30, and the raw okara that falls into the raw okara supply pipe 28 due to the rotation of the rotary valve 30 is transferred to the raw okara supply pipe 28 by a pressure blower 34 to smoke it. Transported to Route 26. The raw okara thus charged into the flue 26 is blown into the okara drying device by the exhaust gas.

The outer periphery of the flue 26 is surrounded by an iron plate, and a heat exchange chamber 36 is formed between the flue 26 and the flue. This heat exchange chamber 3
A blown air inlet 38 is provided near the end of the tube 6, and a hot air outlet 40 is provided near the start end. A blower pipe 42 is connected to the blower air inlet 38, so that air from a blower 44 flows in. A hot air blower pipe 16 is connected to the hot air outlet 40, so that the hot air flows into the hot air blower pipe. 1
It is designed to flow into 6.

The okara drying device consists of two cyclone-type drying towers, and the outer cylinder 48 of the first drying tower 46 is a cylinder arranged vertically with a closed top surface, and the outer cylinder 48 of the first drying tower 46 is a cylinder with a closed top surface. One end of the flue 26 is connected. Therefore, the high-heat airflow flowing from the flue 26 swirls along the inner surface of the outer fIJ 48. An inner cylinder 50 vertically passes through the center of the upper surface of the outer cylinder 48, and this inner cylinder 50 is directly connected to the hot air introduction pipe 52 of the second drying tower, so that the high heat swirling inside the outer cylinder 48 is removed. Gas passes through the inner cylinder 50 and is discharged to the hot air introduction pipe 52.

Further, a conical portion 54 whose diameter narrows downward is connected to the lower surface of the outer f148, and a dried okara tank 56 is connected below this conical portion 54. A first dried okara 58 is collected at the bottom of the dried okara tank 56, and a first dried okara extractor 60 is attached to the bottom of the dried okara tank 56. .

The 1112th dried okara extracting device 60 has a rotary valve 6
2. It consists of a pressure blower 64 and a first dried okara supply pipe 66. One end of the first dried okara supply pipe 66 is connected to the pressure blower 64, and the other end is connected to the hot air introduction pipe 52.

This first dried okara supply pipe 66 is connected to the dry okara tank 56
is connected to the bottom of the dry okara 58 through a rotary valve 62, and when the rotary valve 62 is rotated, the
is adapted to fall into the first dried okara supply pipe 66. The dried okara 58 that has fallen into the first dried okara supply pipe 66 is sent into the hot air introduction pipe 52 by high pressure air from the pressure blower 64.

The structure of the second drying tower 68 is exactly the same as that of the first drying tower 46, including an outer cylinder 70, an inner cylinder 72, a conical part 74. It consists of a dry okara tank 76. A hot air introduction pipe 52 is connected to the upper part of the outer circumference of the outer cylinder 70 in the tangential direction, and the high-temperature gas that has flowed into the outer cylinder 70 swirls along the inner surface of the outer cylinder 70 and then passes through the inner cylinder 70.
2 and is discharged to the outside air.

Further, at the bottom of the dried okara tank 76 of the second drying tower 68, a dried okara extracting device 84 consisting of a rotary valve 78, a pressure blower 80, and a second dried okara supply pipe 82 is attached. One end of the second dried okara supply pipe 82 is connected to the pressure-feeding blower 80, and the other end is connected to the dry okara supply pipe 22 attached to the combustion tube 10.

This second dried okara supply pipe 82 and dried okara tank 76
is connected to the bottom surface of the rotary valve 78 through a rotary valve 78, and when the rotary valve 78 is rotated, dried okara 86
is adapted to fall into the second dried okara supply pipe 82. The dried okara 86 that has fallen into the second dried okara supply pipe 82 is sent into the combustion tube 10 by high pressure air from the pressure blower 80 .

In order to incinerate okara using the apparatus of this embodiment, the blower 44 is rotated and the air is blown through the air inlet 3 through the air pipe 42.
8 to the heat exchange chamber 36, and the hot air outlet 4
When the air coming out of the 0 is blown into the wind box 14 through the hot air blast pipe 16, the air blown up from the perforated plate 12 causes the granular refractories 20 charged in advance to form a fluidized bed 18. After the fluidized bed 18 is formed, the auxiliary burner 24 heats the fluidized bed 18.

When the temperature of the fluidized bed 18 reaches around 400°C, dry okara is supplied to the fluidized bed 18 from the dried okara supply pipe 22, and together with the combustion of the okara, the temperature of the exhaust gas increases to 900°C.
It will be about. Therefore, the room temperature air that flows into the heat exchange chamber 36 from the blast air inlet 38 through the blast pipe 42 is converted into hot air heated to about 200° C. by heat exchange with the flue 26 in the heat exchange chamber 36. The hot air is then blown into the air box 14 from the hot air outlet 40 through the hot air blow pipe 16.

Further, when the temperature of the fluidized bed 18 reaches 400° C. or higher, the rotary valve 30 of the raw okara charging device 27 is rotated to supply the raw okara 35 in the hopper 32 into the exhaust gas airflow in the flue 26. . The raw okara 35 charged into the flue 10 is carried into the outer cylinder 48 of the first drying tower 46 by the high-temperature gas airflow, and after swirling inside the outer cylinder 48 with the airflow, the high-temperature gas airflow is caused by gravity and centrifugal force. The dried okara is separated from the dried okara and falls through the conical part 54 into the dried okara tank 56 as the first dried okara 58. The high temperature gas from which the first dried okara 58 has been separated is transferred to the inner cylinder 5
0 into the hot air introduction pipe 52.

On the other hand, once the first dried okara 58 is separated into the dry okara tank 56 of the first drying tower 46, the dry okara extracting device 60 is immediately activated. That is, rotary valve 6
2, the first dried okara 58 falls into the first dried okara supply pipe 66 , so the first dried okara 58 falls into the first dried okara supply pipe 66 due to the high pressure airflow from the pressure blower 64 . The hot air is supplied into the hot air introduction pipe 52 through the hot air introduction pipe 52 .

The first dried okara 58 charged into the hot air introduction pipe 52 is transferred to the second drying tower 68 by the high-temperature gas flow from the first drying tower 46.
After rotating inside the outer cylinder 70 with the airflow, it is separated from the high-temperature gas airflow by gravity and centrifugal force, passes through the conical part 74, and is transferred to the dry okara tank 76 as a second dried okara 86. and fall. The high temperature gas from which the second dried okara 86 has been separated is discharged from the inner cylinder 72 to the outside air.

Once the second dried okara 86 is collected in the dried okara tank 76 of the second drying tower 68, the rotary valve 78 is operated to transfer the second dried okara 86 to the second dried okara supply pipe 8.
The second dried okara 86 is charged into the combustion tube 10 through the second dry okara supply pipe 82 and by the high pressure airflow from the pressure blower 80.

The dried okara charged into the combustion tube 10 is burned in the fluidized bed 18, but the air blown up from the perforated plate 12 is
Since it is heated to around 0°C, the specific gravity of the air decreases, which improves the flow of the granular refractory and improves the combustion efficiency.

In addition, the combustion zone of the okara in the fluidized bed is lowered and the combustion distance is extended, so the okara is completely combusted, the generation of smoke in the exhaust gas is prevented, and due to heat exchange with the blown air in the flue, The thermal efficiency of bean curd incineration is significantly improved.

In addition, in this embodiment, the blow air inlet 38 is connected to the flue 2.
6, the hot air outlet 40 is attached to the starting end of the flue 26, but conversely, the blown air inlet 38 is attached to the starting end of the flue 26.
6, a hot air outlet 40 may be attached to the terminal end of the flue 26.

[Effects of the Invention] As explained above, the okara incinerator with a hot air generator of the present invention is provided with a heat exchange chamber having a blast air inlet and a hot air outlet on the outer periphery of the flue, and the heat exchange chamber and Because the fluidized bed furnace blows heated air through a perforated plate through a wind box, the specific gravity of the air is reduced, which improves the flow of granular refractories and improves combustion efficiency. 4. decreases and the combustion distance is extended. is completely combusted, the generation of exhaust gas smoke is prevented, and the thermal efficiency of bean curd incineration is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.
Combustion tube, 12, perforated plate, 14...wind box, 18
Fluidized bed, 20. Granular refractory, 22. Dry okara supply pipe, 24 Auxiliary burner, 26 Flue, 36
Heat exchange room, 38 - Blow air inlet, 40 Hot air outlet, 44 Air blower, 46 First drying tower, 68
Second drying tower

Claims (1)

[Claims] (1) A combustion tube installed vertically, a perforated plate attached to the bottom of the combustion tube, a wind box provided under the perforated plate, and a flue for discharging exhaust gas from the combustion tube. ,
a heat exchange chamber provided on the outer periphery of the flue and having a blown air inlet and a hot air outlet; a blower that blows heated air to the perforated plate via the heat exchange chamber and the wind box; and the perforated plate. It is characterized by comprising a granular refractory that forms a fluidized bed in the combustion tube by the air blown up by the air, a dry okara supply pipe attached to the combustion tube, and an auxiliary burner attached to the combustion tube. Okara drying oven with hot air generator.