JPH0367914A - Bean curd refuse incinerator with heating quantity controller and its incineration - Google Patents

Abstract

PURPOSE:To make it possible to carry out the incineration of refuse of bean curd by charging dried refuse of bean curd to a fluidized bed and burning it by utilizing the exhaust gas that it generated from the fluidized bed heated by granular refractory matters at specified temperature or higher and at the same time controlling the heating quantity by an auxiliary burner according to the combustion heat quantity generated by incinerating the refuse of bean curd. CONSTITUTION:When air is blown up from a multi-hole plate 12 by driving a blower 16, granular refractory matters form a fluidized bed 32. When the temperature in the fluidized bed 32 goes beyond 600 deg.C by heating of an auxiliary burner, raw refuse of bean curd 46 in a hopper 40 is charged into the exhaust gas flow in a flue 34. The raw refuse of bean curd is carried into an outer cylinder 36, and before it passes the conical section 48 their drying advances to accumulate dried refuse of bean curd 28 in a tank 50. Now, a heating quantity controller 60 actuates supply means 52 and at the same time it carries out a specified calculation which consists of a calorie calculation by the self-burning of the dried refuse of bean curd and it controls the heating quantity of an auxiliary burner 30. The dried refuse of bean curd 28 that falls down into a supply pipe 26 from the tank 50 is put into a combustion cylinder 10 by the compressed air of a blower 56, and it is incinerated by the sufficiently high temperature and the stirring of air.

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. Along with attaching a drying device,
The present invention relates to an okara incineration apparatus and an okara incineration method that control the amount of heating of the incineration apparatus based on the amount of okara incinerated.

[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 water-absorbed soybeans and they are ground using a grinder to make the soybean soup. Put this soybean soup in a pot or a pot and boil it to make zero porridge. The porridge that has been boiled is immediately separated into soy milk and rice grains by squeezing.

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. 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, threatens the very existence of the tofu manufacturing industry. I was able to express my fears.

Okara is the lees left after squeezing soy milk, and it is said that 70 kg of okara is produced from 60 bales of raw soybeans. This okara consists of grain husk and fiber, and has a water content of approximately 8
Although it contains 3%, it is difficult to dry, and if okara is left as it is, it will immediately emit a bad odor. Also, although the surface layer rots quickly, the private parts do not rot easily.

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

[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. Okara is a dumpling-like powder mixture that contains a large amount of water, so 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.7 Moreover, by using the residual heat of exhaust gas, the inventors dried the okara balls in advance and broke them apart. The present invention was completed based on the idea of loosening dried okara to make it easier to burn and then incinerating it, as well as controlling the amount of heating of the incinerator according to the amount of heat generated by incinerating the dried okara.

The Ogar 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 a direction tangential to the upper end along the inner wall; A flue that flows in 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 a raw okara charging device that vertically passes through the center of the upper surface of the outer cylinder. an inner cylinder that is attached and discharges exhaust gas that has flowed into the outer cylinder; a conical part that communicates with the lower surface of the outer cylinder and whose outer diameter gradually narrows; and a dry husk that communicates with the lower part of the conical part and accumulates dried okara. a tank, a dry okara supply device that supplies the dried okara collected in the dry okara tank into the combustion cylinder, and heating of an auxiliary burner based on the amount of dried okara supplied by the dry okara supply device. The gist is that the heating amount is controlled by means for controlling the amount of heating.

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. okara dried in the drying process while controlling the heating amount to reduce the heating amount corresponding to the increase in calories due to self-combustion of the dried okara and keep it at a constant level. into the fluidized bed! The gist is that the process consists of - and incineration.

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 purpose of the wind box is to blow air evenly to the perforated plate, and it can be of 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 2111111. If it is less than 0,8+n+n, the okara will not be stirred sufficiently 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. It is from.

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 okara charging device can be installed in any position in the flue where it can be mixed into the exhaust gas airflow. When charging raw okara into the flue, the exhaust gas airflow is higher than the external pressure, so
The charging device is preferably equipped with a pressurizing device or of a rotary valve type.

The conical part that communicates with the lower surface of the outer cylinder maintains an appropriate flow velocity of the exhaust gas airflow, which has a weak inertia and descends while rotating inside the outer cylinder, and removes okara and das I in the exhaust gas airflow due to gravity and centrifugal force. The diameter and length must be sufficient to separate the 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 micro combinator is used and is operated according to an appropriate program, and the set dry okara is input. It is possible to use a device that controls the heating amount of an auxiliary burner based on the heating amount. Alternatively, install multiple auxiliary burners in advance,
Once the supply of dried okara has started, the amount of heating may be controlled by turning off the auxiliary burner corresponding to the increase in 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 a high temperature of 600°C or more.

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, collapsing due to gravity. Separated from exhaust gas by centrifugal force,
It falls along the inner wall of the outer cylinder and conical part into the dry okara tank. During this time, most of the water in the raw okara is blown away and fully loosened, and it comes into contact with the high-temperature exhaust gas and falls, and is collected as smooth dry okara in the dry okara tank. .

The amount of dry okara supply is set in advance in the heating amount control means, and an operation command is given to the dry okara supplying device so that the set supply amount is achieved. The dried okara accumulated in the tank is sent to the combustion tube by the dry okara feeder, and then put into the fluidized bed where it burns at high temperature.The granular refractory loosens the okara sufficiently and instantly removes moisture. At the same time, it evaporates and burns without producing smoke due to 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,
Since the heating amount of the auxiliary burner is controlled, no excess heat is consumed, and the dried okara is burned with good combustion efficiency.

[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 has a vertically long cylindrical shape and is installed almost vertically. A perforated plate 12 with a large number of holes is attached to the bottom of the combustion tube 1o, and the perforated plate 12
A wind box 14 is attached below. Further, a blower 16 is attached to the side surface of the wind box.

Further, a dry rice grain supply pipe 26 is attached to the side surface of the fuel cylinder 10, and dry rice grains 28 are introduced into the combustion cylinder 1°. Incidentally, the granular refractory material 2o is charged in advance into the combustion tube lo in an amount sufficient to form a fluidized bed. Auxiliary burner 30
is attached to the wall of the fuel cylinder 10 facing toward the perforated plate 12 so as to heat the flow M32 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 through the flue 34 into the outer tube 36. There is.

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 tangential direction of the upper part of the outer circumference. Therefore, the exhaust gas flow 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 1o, so that the exhaust gas swirling inside the outer cylinder 36 is discharged into the atmosphere through the inner cylinder 38.

A raw rice husk charging device 4o is attached to the upper part of the flue 34. This raw okara charging bag W 40 has hopper 4
2 is attached to the upper part of the flue 34 via a rotary valve 44, and by rotation of the rotary valve 44, the raw rice husks/16 are charged into the flue 34 without communicating with the outside air. It looks like this.

The lower surface of the outer cylinder 36 has a conical portion 4 whose diameter narrows downward.
8 are in communication with each other, and a dried okara tank 50 is further connected below the conical part 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 is a rotary valve 52 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 dry okara tank 50 via a rotary valve 54, and when the rotary valve 54 is rotated, the dried okara 28 is connected to the dry okara tank 50 and the dried okara is supplied. The dried okara is allowed to fall into the supply pipe 26 while the pipe 26 is shut off by the rotary valve 54.

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 is a well-known microcomputer consisting of a CPU, ROM, and RAM, and is used to preset a desired amount of dried okara to be supplied.

The heating amount control K W 60 operates the dry okara supplying device according to a predetermined program, and also performs a predetermined calculation based on preset dry okara supply amount data to control the heating amount of the auxiliary burner 30. It is composed of

To incinerate okara using the device of this example, air blowing 1
11116 is rotated to blow air into the wind box (4), and the air is blown up from the perforated plate 12, the granular refractories 20 charged in advance are caused to flow M by the air blown up from the perforated plate.
form 32. After the granular copper refractory 20 forms a fluidized bed 32 of an appropriate thickness by the air blown up from the perforated plate 12, 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 release the hopper 4.
The raw bean curd 46 in 0 is fed 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 flue 34,
While passing through the outer cylinder 36 and the conical part 48, drying progresses and the dried bean curd 28 is 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 charged into the combustion tube 10 by compressed air. The dried bean curd 28 supplied into the combustion tube 0 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 supply amount from the dry okara, calculates the required heating amount of the fluidized bed 32, and calculates the required heating amount of the fluidized bed 32. Based on the results, the heating amount of the auxiliary burner 30 is controlled. As a result, the dried okara is combusted with high combustion efficiency without consuming excess heat.

Eggplant 3. In this embodiment, the heating amount of the auxiliary burner 30 is controlled, but if a plurality of auxiliary burners 30 are installed in advance and the supply of dried okara starts, the set dry okara 28 The heating amount may be controlled by extinguishing the number of auxiliary burners 30 corresponding to the increased calories due to self-combustion of the incinerated okara according to the supply amount of the incinerated okara.

[Effect of the invention] Okara incineration device with heating amount control device of the present invention and step 3
As explained above, the method for incinerating okara is to form a fluidized bed heated to over 600℃ using granular refractories, and then fluidize the dried okara using a drying device that uses IJF gas generated from the fluidized bed. The dumpling-shaped raw okara, which has a moisture content of about 83%16, is removed by a drying device that uses exhaust gas airflow to remove most of the moisture and is then loosened and turned into granular refractories. Since the water is mixed into the fluidized bed formed by the process, moisture evaporates instantly, and the high temperature and sufficient air supply allow for complete combustion without producing smoke.

Moreover, the amount of heating by the M-bar burner in the fluidized bed is controlled according to the amount of combustion heat of dried okara, so the combustion heat of the okara itself can be used efficiently, resulting in the incineration of okara with low fuel consumption and high thermal efficiency. realizable.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the device of the present invention. 10・Combustion cylinder, 12 Perforated plate, 14・Wind box, 1
6 - Blower, 20 - Granular refractory, 26 - Drying oven 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... Dried okara tank, 52... Dried okara supply device, 60
・Heating amount control device patent applicant Takahashi Shoten Co., Ltd.

Claims (2)

[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 air to the perforated plate through the wind box. 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 that is closed and swirls the exhaust gas airflow flowing in from the tangential direction of the upper end along the inner wall;
A flue that guides exhaust gas discharged from the upper part of the combustion tube and causes it to flow in from a tangential direction of the outer tube, and a raw okara that charges raw okara into the exhaust gas airflow in the flue or the outer tube. a charging device, an inner cylinder that is attached vertically through the center of the upper surface of the outer cylinder and discharges exhaust gas that has flowed into the outer cylinder, and 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; a dry okara supply device that supplies the dried okara collected in the dry okara tank into the combustion cylinder; An okara incineration device with a heating amount control device, comprising a heating amount control means for controlling the heating amount of an auxiliary burner based on the amount of dried okara supplied by the dry okara supply device. (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 heating the fluidized bed. The okara dried in the drying step is charged into the fluidized bed and incinerated 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 and keep it at a constant level. A method for incinerating okara characterized by comprising the steps of: