JPH0554006B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an incineration device and method for incinerating okara generated in the process of manufacturing tofu, and more specifically, it relates to an incineration device and a method for incinerating okara generated in the process of manufacturing tofu, and more specifically, it relates to an incineration device and a method for incinerating okara generated in the tofu manufacturing process. The present invention relates to a bean curd incineration device that is equipped with a drying device and controls the amount of heating of the incinerator based on the amount of incinerated bean curd, and a method of incinerating bean curd.

[Prior Art] In a method for producing tofu, first, raw soybeans are soaked in water to swell the raw soybeans. Next, water is added to the soybeans that have soaked up the water, and the soybeans are ground using a grinder to make the soybean soup. This soybean soup 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 large 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 at a certain price, but due to an oversupply of okara, okara was reduced to nothing.
On the contrary, the situation has become such that people have to pay money to have it. 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. It came out.

Okara is the lees left after squeezing soy milk, and it costs 60 yen per bag.
It is said that 70 kg of okara is generated from 1 kg of raw soybeans. This okara consists of grain husk and fiber,
Although it contains approximately 83% water, it is difficult to dry, and if okara is left as it is, it will immediately emit a foul odor. Also, the surface layer rots quickly, but the core does not rot easily.

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

[Problems to be Solved by the Invention] The present invention has been developed in view of the above-mentioned problems regarding the disposal of excess okara, which is currently becoming a problem in the tofu manufacturing industry, that is, the disposal of okara generated after squeezing soymilk. The object of the present invention is to provide a device that can easily process okara that is to be disposed of other than being used as feed.

[Means for solving the problem] 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 agitation, rapid heat transfer, and excellent reactivity, and also used the residual heat of exhaust gas to dry the okara balls in advance. The present invention was completed based on the idea of breaking the dried okara into pieces to make it easier to burn and then incinerating it, as well as controlling the amount of heat from the incinerator according to the amount of heat generated by incinerating the dried okara.

The okara incinerator with a heating amount control device of the present invention includes a combustion tube installed almost vertically, a perforated plate attached to the bottom of the combustion tube, and a wind box attached under the perforated plate. a blower that blows air to the perforated plate through the air box; a granular refractory that forms a fluidized bed in the combustion tube by air blown up from the perforated plate; and a granular refractory that is attached to the combustion tube and heats the fluidized bed. an auxiliary burner that is arranged vertically and whose upper surface is closed and which swirls the exhaust gas airflow flowing in from the tangential direction of the upper end along the inner wall; A flue that allows inflow from the tangential direction,
A raw okara charging device that charges raw okara into the exhaust gas airflow in the flue or the outer cylinder, and an exhaust gas that is attached vertically through the center of the upper surface of the outer cylinder and flows into the outer cylinder. an inner cylinder for discharging okara, a conical part that communicates with the lower surface of the outer cylinder and whose outer diameter gradually narrows, a dry okara tank that communicates with the lower part of the conical part and accumulates dried okara, and an inside of the dry okara tank. a dry okara supply device that supplies the dried okara collected in the combustion cylinder into the combustion cylinder; and a heating amount control means that controls the amount of heating of the auxiliary burner based on the amount of dried okara supplied by the dry okara supply device. The gist is to consist of:

Further, the method for incinerating okara of the present invention includes a step of forming a fluidized bed made of granular refractories, a step of heating the fluidized bed, and drying the raw okara in an exhaust gas stream that heated the fluidized bed. The okara dried in the drying step is controlled by reducing the heating amount corresponding to the increase in calories due to self-combustion of the dried okara by incinerating the heating temperature of the fluidized bed and maintaining the heating amount at a constant level. The gist is that it consists of a step of charging the fluidized bed into the fluidized bed and incinerating it.

The combustion cylinder used as the incinerator may be of a cylindrical shape with a relatively high height. The perforated plate attached to the bottom of the combustion tube covers the entire bottom of the combustion tube, and is evenly distributed with an appropriate density and size so that a fluidized bed is formed by the air blown out from the holes in the perforated plate. It is desirable that holes be drilled in the holes. In addition, it is necessary to perform appropriate work on the perforated plate to prevent granular refractories from accumulating and falling out of the holes during wind breaks. 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 that forms the fluidized bed may be any material that has sufficient fire resistance at the combustion temperature of the fluidized bed, such as silica, alumina, magnesia, etc., and the particle size is approximately 0.8 to 2 mm. It is preferable. This is because if it is less than 0.8 mm, stirring of the bean curd curd will not be sufficient and there will be a lot of loss as it scatters into the flue, and if it exceeds 2 mm, a satisfactory fluidized bed will not be formed.

The outer cylinder may be a cylinder whose upper surface is closed and has an outer diameter and height sufficient to swirl the exhaust gas flow flowing in from the tangential direction of the upper part along the inner wall. The inner cylinder vertically passes through the center of the upper surface of the outer cylinder, and its lower end has an outer diameter that is inserted deep enough into the outer cylinder and sufficiently exhausts the exhaust gas that has flowed into the outer cylinder and is swirled. It is fine as long as you have it.

The raw bean curd charging device may be installed at any position in the flue where it can be mixed into the exhaust gas airflow. When raw bean curd curd curd is charged into the flue, since the exhaust gas flow is higher than the external pressure, it is preferable that the charging device be equipped with a pressurizing device or be of a rotary valve type.

The conical part that communicates with the lower surface of the outer cylinder maintains an appropriate flow rate of the exhaust gas airflow, which has a weak inertia and descends while rotating inside the outer cylinder, and separates okara and dust in the exhaust gas airflow by gravity and centrifugal force. Sufficient diameter and length are required. Further, it is preferable that the dried okara tank has a size sufficient to collect and contain the dried okara and dust separated from the exhaust gas stream by the outer cylinder and the conical part.

Since the pressure inside the combustion cylinder is high, it is preferable to use a method such as pressure feeding with high-pressure air for the dry okara supply device that supplies the dried okara collected in the dry okara tank into the combustion cylinder. .

In addition, as a heating amount control means for controlling the heating amount of the auxiliary burner based on the amount of dried okara supplied by the dried okara supplying device, for example, a microcomputer is used to operate according to an appropriate program, and the dried okara is It is possible to use a device that controls the heating amount of an auxiliary burner based on the input amount. Alternatively, a plurality of auxiliary burners may be installed in advance, and once the supply of dried okara has started, the amount of heating may be controlled by extinguishing the auxiliary burners corresponding to the increased calories due to self-combustion of the incinerated okara.

[Function] When air is blown onto the perforated plate by a blower through the wind box, a fluidized bed of granular refractories is formed within the combustion cylinder by the air blown up from the perforated plate. This fluidized bed is heated by an auxiliary burner. Combustion begins immediately and the temperature rises to over 600℃.

On the other hand, a high-temperature exhaust gas stream discharged from the combustion tube flows into the outer cylinder through the flue, swirls within the outer cylinder, and is exhausted from the inner cylinder. Dumpling-shaped raw okara with about 83% moisture is mixed into the high-temperature exhaust gas airflow from the flue or the top of the outer cylinder by the raw okara insertion device, and swirls inside the outer cylinder with the exhaust gas airflow, and is It is separated from the exhaust gas by centrifugal force and falls into the dry okara tank along the inner wall of the outer cylinder and conical part. During this time, most of the water in the raw bean curd is blown off and sufficiently loosened, and falls on contact with the high temperature exhaust gas, so that it is collected in the dry bean curd tank as smooth dry bean curd.

The amount of dried okara supply is set in advance in the heating amount control means, and an operation command is given to the dry okara supply device so that the set supply amount is achieved. The dried okara accumulated in the dry okara tank is sent to the combustion tube by the dry okara feeder, and is thrown into the fluidized bed where it burns at high temperature. It evaporates instantly and burns without producing smoke due to the high temperature and sufficient air supply. On the other hand, the heating amount control means performs a predetermined calculation based on the set dry okara supply amount and controls the heating amount of the auxiliary burner, so that no excess heat is consumed and the dry okara is burned efficiently. Burn.

[Embodiments] 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 has a vertically long cylindrical shape and is installed almost vertically. A perforated plate 12 having a large number of holes is attached to the bottom of the combustion tube 10, and a wind box 14 is attached below the perforated plate 12. Further, a blower 16 is attached to the side surface of the wind box.

In addition, a dry okara supply pipe 26 is attached to the side of the combustion tube 10, and a dry okara supply pipe 28 is supplied to the combustion tube 10.
Input into 0. Incidentally, the granular refractory material 20 is charged in advance into the combustion tube 10 in an amount sufficient to form a fluidized bed. The auxiliary burner 30 is attached to the wall of the combustion tube 10 toward the perforated plate 12 so as to heat the fluidized bed 32 formed on the perforated plate 12.

A flue 34 is attached to the upper part of the combustion tube 10 and connected to the outer tube 36, so that the exhaust gas from the combustion tube 10 flows into the outer tube 36 through the flue 34. .

The outer cylinder 36 is a cylinder arranged vertically and whose upper surface is closed, and one end of the flue 34 is connected to the upper part of the outer periphery in a tangential direction. Therefore, the exhaust gas airflow flowing in from the flue 34 swirls along the inner surface of the outer cylinder 36. An inner cylinder 38 is attached vertically through the center of the upper surface of the outer cylinder 10, so that the exhaust gas swirling inside the outer cylinder 36 is discharged into the atmosphere through the inner cylinder 38.

A raw okara charging device 40 is attached to the upper part of the flue 34. This raw okara charging device 40
The hopper 42 is attached to the upper part of the flue 34 via a rotary valve 44, and the rotation of the rotary valve 44 allows raw okara 46 to be removed.
is charged into the flue 34 without communicating with the outside air.

A conical portion 48 whose diameter decreases downward is connected to the lower surface of the outer cylinder 36, and a dried okara tank 50 is connected below the conical portion 48.
Dried okara 28 is collected at the bottom of the dry okara tank 50, and a dry okara supply device 52 is attached to the bottom of the dry okara tank 50.

The dry okara supply device 52 has a rotary valve 5
4. It consists of a blower 56 and a supply pipe 26. One end of the dried okara supply pipe 26 is connected to a blower 56.
The other end is connected to the side surface of the combustion tube 10. Further, the dried okara supply pipe 26 is connected to the bottom of the dried okara tank 50 via a rotary valve 54, and when the rotary valve 54 is rotated, the dried okara 28 is supplied to the dry okara tank 50.
0 and the dry okara supply pipe 26 are connected to the rotary valve 5.
4, dry okara supply pipe 2
It is set to fall within 6.

Further, the dried okara 28 that has fallen into the dried okara supply pipe 26 is sent into the combustion tube 10 by high pressure air from the blower 56.

The heating amount control device 60 includes a CPU, ROM and
It is a well-known microcomputer consisting of RAM, and the desired dry okara supply amount is set in advance. The heating amount control device 60 operates the dry okara supply device according to a predetermined program, and
It is configured to perform a predetermined calculation based on preset data on the supply amount of dry okara to control the heating amount of the auxiliary burner 30.

To incinerate bean curd using the apparatus of this embodiment, the blower 16 is rotated to blow air into the wind box 14 and the air is blown up from the perforated plate 12. A fluidized bed 32 is formed by the air blown up from the perforated plate. The granular refractories 2 are blown up by the air blown up from the perforated plate 12.
After forming the fluidized bed 32 with a suitable thickness, the fluidized bed 32 is heated by an auxiliary burner.

When the temperature of the fluidized bed 32 reaches 600° C. or higher, the rotary valve 44 of the raw okara charging device 40 is rotated to supply the raw okara 46 in the hopper 40 into the exhaust gas stream in the flue 34.

Raw bean curd 46 charged into the flue 34 is carried into the outer cylinder 36 by the exhaust gas airflow, swirls inside the outer cylinder 36 with the airflow, and is separated from the exhaust gas airflow by gravity and centrifugal force to form a conical part. 48 and fall to the dust bunker 50. The exhaust gas from which the dust and dried okara have been separated is discharged from the inner cylinder 38 into the atmosphere. On the other hand, raw okara 46 has a flue 34 and an outer cylinder 3.
6 and the conical part 48, drying progresses and the dried bean curd 28 is further loosened and deposited in the dried bean curd tank 50.

Once the dried okara 28 is collected in the dried okara tank 50, the heating amount control device 60 is activated. The heating amount control device 60 operates the dry okara supply device 52 so that a preset dry okara supply amount is achieved. That is, the blower 56 is rotated to blow high-pressure air into the dried okara supply pipe 26, and the rotary valve 54 is rotated at a predetermined rotation speed.
The dried okara tank 50 and the dried okara supply pipe 26 are shut off by the rotary valve 54 , and the dried okara 28 falls into the supply pipe 26 . A predetermined amount of dried okara 28 is transferred to the combustion tube 10 by compressed air.
charged inside. The dried bean curd 28 supplied into the combustion tube 10 is mixed into the fluidized bed 32, so that the dried bean curd 28 is incinerated by the sufficiently high temperature of the fluidized bed 32 and the agitation of air.

On the other hand, the heating amount control device 60 performs a predetermined calculation consisting of calorie calculation due to self-combustion of the dried okara based on the set dry okara supply amount, and
2 is calculated, and the heating amount of the auxiliary burner 30 is controlled based on the obtained result. As a result, the dried okara is combusted with high combustion efficiency without consuming excess heat.

Note that in this embodiment, the heating amount of the auxiliary burner 30 is controlled, but the auxiliary burner 30
A plurality of auxiliary burners 30 are installed in advance, and when the supply of dried okara 28 starts, the number of auxiliary burners 30 corresponding to the increased calories due to self-combustion of the incinerated okara according to the set supply amount of dried okara 28 is turned off. By doing so, the amount of heating may be controlled.

[Effects of the Invention] As explained above, the okara incineration device with a heating amount control device and the okara incineration method of the present invention form a fluidized bed heated to 600°C or higher using granular refractories. The dried okara is put into a fluidized bed and incinerated using a drying device that uses the exhaust gas generated from the machine, and the dumpling-shaped raw okara with a moisture content of about 83% is burned using a drying device that uses the exhaust gas airflow. Most of the water is blown away and is loosened and mixed into the fluidized bed formed by the granular refractories in a dry state, so the water evaporates instantly, and due to the high temperature and sufficient air supply, It can burn completely without producing smoke. Furthermore, since the amount of heating by the auxiliary burner of the fluidized bed is controlled according to the amount of combustion heat of the dried okara, the combustion heat of the okara itself can be used efficiently, resulting in low fuel consumption and thermally efficient incineration of the okara. realizable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the device of the present invention. 10... Combustion tube, 12... Perforated plate, 14... Wind box, 16... Blower, 20... Granular refractory, 26
...Dried okara supply pipe, 28...Okara, 30...
... Auxiliary burner, 32 ... Fluidized bed, 34 ... Flue,
36... Outer cylinder, 38... Inner cylinder, 40... Raw okara charging device, 46... Raw okara, 48... Conical part,
50... Dry okara tank, 52... Dry okara supply device, 60... Heating amount control device.

Claims (1)

[Scope of Claims] 1. 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 a blower that blows air to a perforated plate; a granular refractory that forms a fluidized bed in the combustion tube by air blown up from the perforated plate; and an auxiliary burner that is attached to the combustion tube and heats the fluidized bed; an outer cylinder whose upper surface is closed and which swirls the exhaust gas airflow flowing in from the tangential direction of the upper end along the inner wall; and a flue which guides the exhaust gas discharged from the upper part of the combustion cylinder and causes it to flow in from the tangential direction of the outer cylinder. and,
A raw okara charging device that charges raw okara into the exhaust gas airflow in the flue or the outer cylinder, and an exhaust gas that is attached vertically through the center of the upper surface of the outer cylinder and flows into the outer cylinder. an inner cylinder for discharging okara; a conical part that communicates with the lower surface of the outer cylinder and whose outer diameter gradually narrows; a dry okara tank that communicates with the lower part of the conical part and accumulates dried okara; and an inside of the dry okara tank. a dry okara supply device that supplies the dried okara collected in the combustion cylinder into the combustion cylinder; and a heating amount control means that controls the amount of heating of the auxiliary burner based on the amount of dried okara supplied by the dry okara supply device. An okara incineration device with a heating amount control device, characterized by comprising: 2. A step of forming a fluidized bed made of granular refractories, a step of heating the fluidized bed, a step of drying raw okara in an exhaust gas stream that heated the fluidized bed, and a step of controlling the heating temperature of the fluidized bed. A step of charging the okara dried in the drying step into the fluidized bed and incinerating it while controlling the heating amount so as to reduce the heating amount corresponding to the increase in calories due to self-combustion of the dried okara to be incinerated and maintain it at a constant level; A method for incinerating okara characterized by comprising the following steps.