JPH0379911A - Incinerator with dryer for lees of bean curd - Google Patents

Abstract

PURPOSE:To dispose with lees of bean curd easily by forming a fluidized bed that is powerful in stirring, fast in heat conduction, and excellent in reactivity and drying lees of bean curd beforehand by utilizing residual heat in the exhaust gas and incinerating the lees of bean curd. CONSTITUTION:Air is blown into a wind box 14 by rotating a blower 16, and the air is blown up from a multi-hole plate 12, and granular refractories 20 form a fluidized bed 32 by the air that is blowing upwards. The fluidized bed 32 is heated by an auxiliary burner, and when the temperature of the bed 32 goes over 600 deg.C, a valve 44 is rotated and raw lees of bean curd 46 in a hopper 40 is supplied into the exhaust gas flow. The raw lees of bean curd 46 is carried into an outer cylinder 36 by the exhaust gas flow, rotates in the outer cylinder 36, and is separated from the exhaust gas flow and dried through a conical section 48 and it is accumulated as dried lees of bean 28 after it is loosened in a dust banker 50. A blower 56 is rotated to send high pressure air into a pipe 26. When a valve 54 is rotated, the dried lees of bean curd 28 falls into a supply pipe 26, and charged into a combustion tube 10, and it is burned completely with a high combustion efficiency by the high temperature of the fluidized bed 32 and stirring of the air.

Description

[Detailed Description of the Invention] [Industrial Field of Application J] The present invention relates to an apparatus for incinerating okara produced in the process of manufacturing tofu, and more specifically, a drying apparatus that utilizes the residual heat of exhaust gas generated during incineration. This invention relates to an okara incinerator with an attached okara drying device.

[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. 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 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, but 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 even 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 a 60 kg bale of raw soybeans. This okara is composed of grains and fibers, and has a water 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 the rice husks for the time being, 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. It is an object of the present invention to provide a device that can easily dispose of rice husks that are not used as feed but are disposed of as waste.

[Means for solving the problem] The inventors did not stop at drying okara, but also considered incinerating it. Because 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 transmission, 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 the material to make it easier to burn and then incinerating it, and completed the present invention.

The okara incinerator with a drying device of the present invention includes a combustion tube installed almost vertically, a perforated plate attached to the bottom of the combustion tube, a wind box attached under the perforated plate, and a a blower that blows air to the perforated plate through a wind box;
A granular refractory that forms a fluidized bed in the combustion tube by air blown up from the perforated plate, an auxiliary burner attached to the combustion tube, and an exhaust gas airflow that is arranged vertically and has a closed top surface and flows in from a tangential direction of the top end. an outer cylinder that rotates the
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 dust bunker that communicates with the lower part of the conical part and collects dried okara and dust, and a dry okara supply device that supplies the dried okara collected in the dust bunker into the combustion cylinder. This is the summary.

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 evenly drilled with an appropriate density and size so that the air blown out from the holes forms a fluidized bed. To prevent it from accumulating and falling out of the hole,
It is necessary to make appropriate adjustments. 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 that 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 is about 0.8 to 2 mm. Preferably, 0.
This is because if it is less than 8e+m, the cheekbones will not be stirred sufficiently and there will be a lot of loss as they scatter into the flue.
This is because if it exceeds 1, a satisfactory fluidized bed will not be formed.

The outer cylinder may be a cylinder whose top surface is closed and has sufficient outer diameter and height to swirl the exhaust gas flow flowing in from the tangential direction of the upper part along the inner wall.The inner cylinder should be placed at the center of the upper surface of the outer cylinder. It is sufficient that the lower end has an outer diameter that allows the lower end to be inserted deeply into the outer cylinder and to sufficiently exhaust the exhaust gas that has flowed into the outer cylinder and is swirled.

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 separates okara and dust in the exhaust gas airflow using gravity and centrifugal force. Sufficient diameter and length are required. Also,
Preferably, the dust bunker has a size sufficient to collect and contain okara and dust separated from the exhaust gas stream by the outer cylinder and conical part.

The dry okara supply device that supplies the dried okara collected in the dust bunker into the combustion cylinder preferably uses a method such as pressure-feeding with high-pressure air because the pressure inside the combustion cylinder is high.

[Effect] Send m8 through the wind box! When more air is blown through the perforated plate,
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,
The dust falls along the inner wall of the outer cylinder and conical part into the dust bunker. During this time, most of the moisture in the raw bean curd is blown off and sufficiently loosened, and it comes into contact with the high-temperature exhaust gas and falls, so that it is collected in the dust bunker as smooth dry bean curd.

The dried okara collected in the dust bunker is sent to the combustion tube by the dry okara feeder and thrown into the fluidized bed where it burns at high temperature, so it is sufficiently loosened by the granular refractories and the moisture evaporates instantly. At the same time, the fuel burns completely and efficiently without producing smoke due to the high temperature and sufficient air supply.

[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 2 having a large number of holes is attached to the bottom of the combustion tube 10, and this perforated plate 12
A wind box 14 is attached below. Further, a blower 8116 is attached to the side surface of the wind box.

Further, a dried okara supply pipe 26 is attached to the side surface of the fuel cylinder 10, and dried okara 28 is fed into the combustion cylinder 10. Incidentally, the granular refractory material 20 is charged in advance into the combustion tube 10 in an amount sufficient to form a fluidized bed. Auxiliary burner 30
is attached to the wall of the fuel cylinder 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 exhaust gas from the combustion tube 10 flows into the outer tube 36 through the flue 34. 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 airflow flowing from the flue 34 swirls along the inner surface of the outside @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 has a 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 prevents the raw okara 46 from communicating with the outside air.
4.

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 dust bunker 50 is further connected below the conical part 48. Dried okara 28 is collected at the bottom of the dust bunker 50, and a dry okara supply device 52 is attached to the bottom of the dust bunker 50.

The dry okara supply device 52 includes a rotary valve 54, an air blower R56, and a supply pipe 26. One end of the dried okara supply pipe 26 is connected to the blower 56, and 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 surface of the dust bunker 50 via a rotary valve 54.
When rotated, the dried okara 28 falls into the dried okara supply pipe 26 with the dust bunker 50 and the dried okara supply pipe 26 being 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 feeder 56.

To incinerate okara using the device of this example, air blower I
I! 16 to blow air into the wind box 14, and the perforated plate 1
When air is blown up from the porous plate 2, the granular refractories 20 charged in advance are blown up from the perforated plate, causing the fluidized bed 3
form 2. After the granular refractory material 20 forms a flow 7132 with an appropriate thickness due to 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.

The raw bean curd 46 charged into the flue 34 is caught in the exhaust gas airflow and carried into the outer cylinder 36, and after swirling inside the outer cylinder 1'*36 with the airflow, it is separated from the exhaust gas airflow by gravity and centrifugal force. The dust passes through the conical part 48 and falls into the dust bunker 50. The exhaust gas from which dust and dried okara have been separated is transported to the inner cylinder 38.
is emitted into the atmosphere. On the other hand, raw okara 46 is flue 3
4. While passing through the outer cylinder 36 and the conical part 48, drying progresses and the dried bean curd 28 is further loosened and deposited in the dust bunker 50.

Once the dried okara 28 is collected in the dust bunker 50, the dry okara supply device 52 is activated.

That is, the air blower Il! 156 is rotated to send high-pressure air into the dry okara supply pipe 26 and the rotary valve 54 is rotated, the dust bunker 50 and the dried okara supply pipe 26 are shut off by the rotary valve 54 and the dried okara 2 is
8 falls into the supply pipe 26, and the dried okara 28 that has fallen into the supply pipe 26 is blown into the combustion tube 1 by compressed air from the blower 56.
0. The dried okara 28 supplied into the combustion tube 10 is mixed with the flowing N32, so the dried okara 28 is mixed with the flowing N32.
8 is completely incinerated with good combustion efficiency by the sufficiently high temperature of the fluidized bed 32 and the stirring of air.

[Effects of the Invention] As explained above, the okara incinerator equipped with a drying device of the present invention forms a fluidized bed heated to 600°C or higher using granular refractories, and utilizes exhaust gas generated from the fluidized bed. Okara dried by a drying device is put into a fluidized bed and incinerated, and the dumpling-shaped raw okara, which has a moisture content of about 83%, is loosened by a drying device that uses exhaust gas air flow to remove most of the moisture. Since the water is mixed into the fluidized bed formed by the granular refractories in a dry state, the moisture evaporates instantly, and with the high temperature and sufficient air supply,
It can burn completely without producing smoke. In addition, the combustion heat of the okara itself is used efficiently, so
It is possible to incinerate okara with low fuel consumption and high thermal efficiency.

[Brief explanation of drawings]

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, 1
6...Blower, 20 - Granular refractory, 26... Dry 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 Cone part, 50 Dust bunker, 52 Dried okara supply device

Claims (1)

[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; an auxiliary burner attached to the combustion tube; an outer cylinder that swirls an airflow of exhaust gas flowing in from the combustion cylinder along an inner wall; a flue that guides the exhaust gas discharged from the upper part of the combustion cylinder and causes it to flow in from a tangential direction of the outer cylinder; and the flue or the outer cylinder. a raw okara charging device that charges raw okara into the exhaust gas airflow inside the cylinder; an inner cylinder that is attached vertically through the center of the upper surface of the outer cylinder and discharges the 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; a dust bunker that communicates with the lower part of the conical part and collects dried okara and dust;
An okara incinerator equipped with a drying device, comprising: a dry okara supply device that supplies dried okara collected in the dust bunker into the combustion cylinder.