KR20200106585A - Apparatus for food waste treating - Google Patents

Abstract

The present invention relates to a food waste treatment device for treating food waste by incineration, performing power generation using steam produced using heat generated from the incineration, and drying and treating the food waste with heat held by exhaust gas generated from the incineration. The food waste treatment device includes: an input unit into which the food waste is input; a drying unit for heating and drying the food waste input through the input unit to discharge the food waste; an incineration unit for incineration treatment of the food waste discharged from the drying unit; a first condensing unit for generating and discharging first condensed water by condensing vapor among vapors and odorous gas discharged during drying of the food waste in the drying unit, and supplying the odorous gas to the incineration unit; a preheating unit for preheating air using heat held by the exhaust gas generated by the incineration in the incineration unit and supplies the preheated air to the drying unit; a steam generating unit for generating steam using the heat held by the exhaust gas generated by the incineration in the incineration unit and the condensed water discharged from the first condensing unit; and a power generation unit for generating electricity using the steam generated from the steam generation unit.

Description

Food waste treatment device {Apparatus for food waste treating}

The present invention relates to a food waste treatment apparatus, and more particularly, drying and incineration of input food waste, producing steam using incineration heat, performing power generation using the produced steam, and generating power from the incinerator. It relates to a food waste treatment device that can reuse the heat held by exhaust gas and waste steam discharged after power generation for drying food waste.

Food waste, consisting of agricultural, fishery, livestock waste and leftover food waste generated during the production, distribution, processing, and cooking process, is constantly increasing due to the increase of the population, improvement of living conditions, and high-quality dietary life. It is recognized as one of the representative factors of the pollution problem.

As of 2015, the amount of domestic food waste generated is about 5.6 million tons/year, and the treatment cost is about 1 trillion won, and about 20 trillion won is wasted when calculating the economic value of food resources, and greenhouse gas emissions such as CO ₂ are about 9 million tons or more. to be.

Currently, as a recycling method of food waste, there is a method of making food waste into feed or compost, and in the treatment of food waste that cannot be recycled, a method of producing methane gas and treating residual sludge is mainly used through anaerobic digestion. .

On the other hand, since the food waste generated in the early stage contains a large amount of various proteins and is easily corroded, it is considered an economical and eco-friendly method to use the collected food waste as feed, compost, and dry as fuel.

The use of food waste as feed, compost and fuel requires separation of water from food waste.

Referring to Korean Patent Publication No. 2016-41279'food waste drying apparatus', food waste is dried inside a main body housing heated by a heating heater.

As described above, in order to dry the food waste, energy supplied from the outside, such as a heating heater, must be used, and thus a large amount of energy is required.

Meanwhile, in Korea and Japan, where it is difficult to secure food waste conditions and landfill sites, most food wastes that are difficult to recycle are incinerated. When food waste is incinerated, a large amount of heat and steam is generated, but there is a problem that it is not utilized and discharged.

An object of the present invention is to solve the above-described problem, and an object of the present invention is to provide a food waste treatment apparatus capable of drying the food waste by supplying hot air to the food waste.

In addition, an object of the present invention is to provide a food waste treatment apparatus capable of incinerating and treating dried food waste.

In addition, an object of the present invention is to provide a food waste treatment apparatus capable of using heat generated during incineration of food waste to dry food waste.

In addition, it is an object of the present invention to provide a food waste treatment apparatus that generates steam during incineration of food waste and can produce electricity using it, and waste steam discharged after electricity generation can be reused for drying food waste. To do.

In addition, it is an object of the present invention to provide a food waste treatment apparatus capable of treating by burning odor gas generated during drying of food waste during incineration of food waste.

In order to achieve the above object, the present invention treats food waste by incineration, performs power generation using steam produced by using heat generated from incineration, and dry and treats the food waste with heat held by exhaust gas generated from incineration. A food waste treatment apparatus comprising: an input unit into which food waste is input; A drying unit for heating and drying the food waste introduced through the input unit to discharge; An incineration unit for incineration processing the food waste discharged from the drying unit; A first condensing unit for condensing the steam and generating and discharging first condensed water from among the steam and odor gas discharged during drying of the food waste in the drying unit, and supplying the odor gas to the incinerator; A preheating unit for preheating air by using heat held by exhaust gas generated by incineration in the incineration unit and supplying the preheated air to the drying unit; A steam generator for generating steam using heat held by the exhaust gas generated by the incineration in the incineration unit and the condensed water discharged from the first condensing unit; And a power generation unit that generates electricity by using the steam generated by the steam generation unit. It provides a food waste treatment device comprising a.

A first crushing unit disposed below the input unit to crush and discharge the food waste introduced into the input unit to a uniform size, and apply pressure to the food waste to discharge moisture, and to discharge the food waste at one side. It may further include a dehydration unit that moves to and discharges, and a turbofan that sucks air from the outside, raises the temperature by frictional heat generated by friction between the sucked air and the surface, and supplies it to the preheating unit. .

The first crushing unit may include a crushing unit main body providing a crushing space, and a pair of crushing gears disposed inside the crushing unit main body, and crushing blades protrude from the surface to engage with each other and crush the food waste. have.

The dehydration unit includes a dehydration unit main body having a predetermined size and shape and providing a space for dehydration of the food waste, and the food waste disposed inside the dehydration unit main body and flowing into the dehydration unit main body. A screw conveyor for dehydration by applying pressure and moving the food waste from one side of the dehydration unit main body to the other side and discharging the food waste, and the dehydration unit are disposed at a certain height below the main body, and are lower than the screw conveyor. It may include a dehydration network including a mesh network to be disposed.

The drying unit includes a first unit drying unit for drying and discharging the food waste by using heat of waste steam discharged after the power generation unit generates electricity, and the food waste discharged from the first unit drying unit. On the other hand, it may include a second unit drying unit for drying and discharging the food waste by supplying air preheated and discharged from the preheating unit.

The first unit drying unit heats the food waste to dry by using the first drying unit body providing the food waste drying space and the steam disposed inside the first drying unit body and discharged from the power generation unit. It may include a first heater to let.

The second unit drying unit may have a cylindrical shape in which the rear end from which the food waste is discharged is inclined to be 3 to 5 degrees lower than the front end to which the food waste is introduced.

The moisture content of the food waste can be dried to less than 3wt.%.

It may further include a second condensing unit that generates second condensed water obtained by condensing the steam discharged from the first heater and supplies it to the steam generator.

It may further include a second crushing means disposed inside the second unit drying unit to crush the food waste.

The second crushing means may include a rotation shaft disposed on an inner central axis of the second unit drying unit and an annular chain disposed at regular intervals, and a motor connected to the rotation shaft to rotate the rotation shaft.

It is disposed inside the second unit drying unit, the crushing means is disposed inward, and may further include a cylindrical separation net for separating water from the food waste.

The diameter of the separating net may increase as it progresses from one end to the other.

The annular chain may increase in length while proceeding from one end of the rotation shaft to the other end.

The steam generator may generate steam having a temperature of 300 to 450°C and a pressure of 25 to 40 bar.

The turbo fan may be supplied by raising the temperature of the incoming air to about 40 to 50°C.

The turbofan may include an impeller in which a plurality of protrusions protrude from the surface.

In the turbo fan, the protrusion may have a triangular pyramid shape having a height of 1 to 3 mm.

The turbofan may include an impeller having a surface with a surface roughness of Ra100a (400S, 400Z) to Ra200a (800S, 800Z).

The rotational speed of the turbofan may be 10000 to 70000 rpm.

In the present invention as described above, drying of the food waste can be achieved by supplying high temperature air to the food waste.

In addition, the present invention can be treated by incineration of dried food waste.

In addition, the present invention can use the heat generated during incineration of the food waste to dry the food waste.

In addition, the present invention can generate steam during incineration of food waste and use it to generate electricity, and waste steam discharged after electricity generation can be reused for drying food waste.

In addition, the present invention can be treated by burning the odor gas generated during the drying of the food waste during incineration of the food waste.

1 is a view showing the configuration of a food waste treatment apparatus according to an embodiment of the present invention.
2 is a plan view showing an example of a configuration of a first crushing unit used in the present invention.
3 is a diagram showing an example of a configuration of a second crushing unit used in the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the configuration of a food waste treatment apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a food waste treatment apparatus 100 according to an embodiment of the present invention includes an input unit 110, a first crushing unit 110A, a dehydration unit 120, a drying unit 130, and an incineration unit. 140, a first condensing unit 150A, a preheating unit 160, a turbo fan 170, a steam generating unit 180, and a power generating unit 190.

Food waste, which is an object to be dried, is put into the input unit 110. Food waste can be put in a food waste bag.

The input unit 110 may be formed in a funnel shape having a predetermined size. The input unit 110 may be formed in various forms as long as the food waste can be easily introduced.

The first crushing unit 110A primarily crushes food waste that is input to the input unit 110, especially food waste that is put in a bag. The food waste bag is crushed by the first crushing unit 110A, so that a subsequent drying process can be easily performed.

2 is a plan view showing an example of a configuration of a first crushing unit used in the present invention.

Referring to FIG. 2, the first crushing part 110A includes a crushing part body 112A and a crushing gear 114A.

The crushing unit body 112A has a hexahedral shape having a predetermined size and provides a space in which food waste is crushed.

The crushing gears 114A are arranged in parallel in a pair inside the crushing portion main body 112A. From the surface of the crushing gear 114A, a helical crushing blade 116A protrudes from one end to the other and has a predetermined height.

The first motor M1 is connected to the central axis of any one of the crushing gears 114A. Further, at one end of the drive shaft of the crushing gear 114A, rotation gears 115A meshed with each other are disposed. Accordingly, the driving force of the first motor M1 is transmitted to the pair of crushing gears 114A by the rotation gear 115A, and accordingly, the pair of crushing gears 114A rotate in opposite directions to each other.

In this embodiment, the crushing gear 114A has a shape in which a predetermined crushing blade 116A protrudes, but may be formed in the form of a helical gear, a spur gear, or the like, if food waste can be crushed to a uniform size.

The dehydration unit 120 applies a predetermined pressure to the food waste input through the input unit 110 to separate moisture contained in the food waste. In addition, the dehydration unit 120 allows the food waste to move to the drying unit 130 to be described later while dehydration proceeds from the food waste.

The dehydration unit 120 may include a dehydration unit body 122, a screw conveyor 124, and a dehydration network 126.

The dehydration unit main body 122 has a predetermined size and shape, and provides a space in which water is separated from food waste by a screw conveyor 124 to be described later.

A crushing means (not shown) is disposed above one end of the dehydration unit main body 122 to crush the input food waste so that water can be separated more easily.

The screw conveyor 124 is disposed horizontally in the dewatering unit body 122.

A second motor (M2) is connected to one end of the rotating shaft at the center of the screw conveyor 124, so that the screw conveyor 124 is rotated by the first motor (M1) and for food waste injected into the dewatering unit main body 122 Water is separated from the food waste by applying a predetermined pressure.

In addition, the screw conveyor 124 separates water from the food waste and moves the food waste to the other side of the dehydration unit 122 to be discharged to the drying unit 130 to be described later.

Since the screw conveyor 124 is a well-known technique, a detailed description thereof will be omitted.

The dehydration net 126 is disposed at a predetermined height below the inner side of the dehydration unit main body 122. Here, the dehydration net 126 is disposed lower than the screw conveyor 124.

The dewatering network 126 includes a mesh network in which a plurality of holes having a predetermined size are formed.

Water separated from food waste is discharged to the dehydration network 126 by a screw conveyor 124. Water that has passed through the dehydration network 126 is discharged to the outside through a drain hole 127 disposed separately.

The separated moisture is treated separately after being discharged through the first outlet 127.

The drying unit 130 supplies heat to the input food waste so that drying is performed.

The drying unit 130 includes a first unit drying unit 130A and a second unit drying unit 130B.

The first unit drying unit 130A is used in the power generation unit 190, which will be described later, for food waste that is dehydrated and discharged from the dehydration unit 120 after input through the input unit 110 and is discharged. Is supplied to allow drying to occur.

The first unit drying unit 130A includes a first drying unit body 132A and a first heater 134A.

The first drying unit body 132A has a predetermined size and shape, and provides a space for drying food waste therein.

The first heater 134A is formed in the form of a coil wound a plurality of times. Inside the first heater 134A, the waste vapor that is discharged after being used for power generation in the power generation unit 190 to be described later moves.

The waste steam flowing through the first heater 134A supplies the retained heat to the food waste in the first drying unit body 132A, and heats the food waste to be dried.

The second unit drying unit 130B receives preheated air discharged from the preheating unit 160 to be described later, and performs drying of the food waste discharged from the first unit drying unit 130A. The second unit drying unit 130B is dried so that the moisture content of the food waste is 3wt.% or less.

Air used for drying in the second unit drying unit 130B may be supplied to the incineration unit 140 to be described later together with the dried food waste.

Meanwhile, a second crushing part 130C, which will be described later, is disposed inside the second unit drying part 130B to crush food waste to increase a drying speed.

2 is a diagram showing an example of the configuration of a crushing unit used in the present invention.

Referring to FIG. 2, the second shredding unit 130C is disposed inside the second unit drying unit 130B, and applies an impact force to the food waste flowing into the second unit drying unit 130B to reduce the food waste. Shred into small sizes.

The second crushing part 130C includes a rotating shaft 132C, an annular chain 134C, and a separation net 136C.

The rotation shaft 132C is disposed on the central axis of the second unit drying unit 130B. A third motor M3 driving the rotation shaft 132C may be connected to one end of the rotation shaft 132C.

The rotation shaft 132C may rotate at 300 to 600 RPM by the operation of the third motor M3.

The annular chain 134C is disposed at regular intervals along the rotation shaft 132C, and applies an impact force to the food waste according to the rotation of the rotation shaft 132C. The annular chain 134C may be formed by continuously connecting metal rings having a predetermined size and load. Here, the size and shape of the metal ring included in the annular chain 134C may be variously set according to the needs of the user.

The operation of the cyclic chain 134C will be described.

The annular chain (134C) is unfolded in a straight line by centrifugal force according to the rotation of the rotating shaft (132C), and in the unfolded state, impacts the food waste so that the food waste is crushed to a smaller size. In addition, when an impact is applied to the food waste by the annular chain 134C, the food waste may be crushed and moisture may be separated from the food waste. At this time, the separated moisture is discharged through the inner body (142B).

In addition, the annular chain (134C) stirs the pulverized food waste and uniformly contacts the air inside the second unit drying unit 130B to dry the food waste.

The separation net (136C) is disposed inside the second unit drying unit (130B). The separating net 136C includes a mesh net in which a plurality of holes having a predetermined size are formed. A rotation shaft 132C and an annular chain 134C are disposed inside the separation net 136C.

The separation net (136C) may be formed in a cylindrical shape having a predetermined length and diameter. Here, the diameter of the separating net 136C increases as it progresses from one end to the other end.

When the food waste is crushed by the annular chain 134C through the separating net 136C, water separated from the food waste is discharged. The moisture discharged through the separating net 136C is discharged through the second discharge port 137C disposed at one side of the second unit drying unit 130C. The discharged water is treated separately as wastewater.

Here, the length of the annular chain 134C disposed inside the separating net 136C is increased from one end of the rotation shaft 132C to the other end corresponding to the radius of the separating net 136C. In addition, the end of the annular chain 134C is set to be spaced apart from the inner circumferential surface of the separating net 136C by a predetermined distance (eg, 3 mm).

Meanwhile, during the drying process in the first unit drying unit 130A and the second unit drying unit 130B, predetermined steam and odor gas are generated. Steam and malodorous gas are supplied to the first condensing unit 150A, which will be described later.

The incineration unit 140 incinerates food waste that is dried and discharged by the second unit drying unit 130B, produces and discharges predetermined heat by incineration, and discharges and treats the ash generated by incineration separately.

In addition, the incineration unit 140 incinerates the malodorous gas discharged from the first condensation unit 150A to be described later together with food waste.

The first condensing unit 150A receives steam and odor gas discharged from the first unit drying unit 130A and the second unit drying unit 130B, and condenses them to generate and discharge first condensed water. The first condensed water is supplied to the steam generator 180 to be described later through the first condensed water supply pipe 152A.

In addition, the first condensing unit 150A supplies the odor gas discharged from the first unit drying unit 130A and the second unit drying unit 130B to the incineration unit 140 through a gas supply pipe 154 to provide food waste. When incinerated, they are incinerated together to be removed.

The second condensing unit 150B condenses the waste steam discharged after being used for heating food waste in the first heater 134A to generate and discharge second condensed water. The second condensed water is supplied to the steam generator 180 to be described later through the second condensed water supply pipe 152B.

The preheating unit 160 preheats external air by using heat held by the exhaust gas generated during the incineration of food waste in the incinerator 140, and then supplies it to the second unit drying unit 130B.

In this case, the air preheated by the preheating unit 160 may be heated to a predetermined temperature. That is, the preheating unit 160 may increase the temperature of the air supplied from the turbo fan 170 to be described later to 110 to 250°C, and then supply the air to the second unit drying unit 130B.

The turbo fan 170 rotates at a predetermined rotational speed, and after raising the temperature of the air by frictional heat between the surface and the air, it is supplied to the preheating unit 160 to improve preheating efficiency in the preheating unit 160. .

The turbofan 170 may rotate at 10,000 to 70,000 rpm.

In addition, the turbo fan 170 raises the air introduced from the outside to about 40 to 50° C. from the temperature at the time of inflow, and then supplies it to the second heating unit 130B to facilitate drying of food waste.

Heat application from the turbofan 170 may be performed as follows.

The turbo fan 170 may have an impeller (not shown) of a predetermined shape disposed therein.

The impeller is a mechanical device configured to have a plurality of blades along the periphery of a body and to supply fluid in one direction by the blades while the body rotates. Here, the surfaces of the components constituting the impeller are processed to have a predetermined roughness (roughness), so that the air supplied through the impeller contacts the surfaces of the components included in the impeller, and a predetermined friction is generated, resulting in frictional heat. The temperature can rise by applying.

Here, the surface roughness of the components is preferably Ra100a (400S, 400Z) to Ra200a (800S, 800Z).

And, if the surfaces of the components can have a predetermined roughness, various processing methods can be applied according to the needs of the user.

In addition, the impeller may protrude a plurality of triangular pyramid-shaped protrusions having a predetermined height on the surface. Here, the height of the protrusion may be 1 to 3 mm, but may be variously set according to the needs of the user.

Here, the protrusion may be formed by performing a process of forming irregularities, such as crushing.

In this embodiment, it is described that the impeller is used in the turbo fan 170, but a predetermined pressure can be applied to the supplied air, and the surface of the components can be processed to a predetermined roughness or the protrusions can protrude from the surface. If possible, configurations other than impellers may be used.

The steam generator 180 uses the heat held by the exhaust gas generated by the incineration in the incineration unit 140 and the first and second condensed water discharged from the first condensation unit 150A and the second condensation unit 150B. Generates and supplies it to the power generation unit 190.

The power generation unit 190 generates and outputs electricity by using the steam supplied from the steam generation unit 180. Since the power generation method using steam is a well-known technique, a detailed description thereof will be omitted.

The steam used for electricity generation in the power generation unit 190 retains predetermined heat even when it is discharged after being used for power generation. Accordingly, the waste steam discharged after being used in the power generation unit 190 may be supplied to the first unit drying unit 130A and used for drying food waste.

The operation of the present invention configured as described above will be described.

For the treatment of food waste, the drying apparatus according to the present invention can be used as follows.

The user puts food waste to be dried into the input unit 110.

The input food waste is introduced into the dewatering unit 120 after the food waste bag is crushed in the first crushing unit 110A.

Food waste flowing into the dewatering unit 120 is compressed by a screw conveyor 124 at a predetermined pressure and dehydrated. Here, the dehydrated water is discharged to the lower portion through the dehydration network 126 and then discharged through the drain port 144B. The screw conveyor 124 performs dehydration of the food waste by compression and simultaneously discharges the dehydrated food waste to the outside of the dehydration unit 120.

The food waste discharged from the dehydration unit 120 flows into the first unit drying unit 130A.

The food waste introduced into the first drying unit body 130A is heated and dried by heat applied through the first heater 134A.

The first heater 134A heats food waste by using the heat of waste steam discharged after being used for power generation in the power generation unit 190. However, at the beginning of the operation of the present invention, the first heater 134A may dry food waste by using steam supplied from a predetermined heating means (eg, a boiler).

The waste steam discharged from the first heater 134A is generated as second condensed water in the second condensing unit 150B and discharged, and then supplied to the steam generating unit 180.

The food waste dried and discharged by the first unit drying unit 130A is supplied to the second unit drying unit 130B.

The second unit drying unit 130B may dry food waste by using the high-temperature air supplied from the preheating unit 160.

Here, when the food waste contains animal bones, shells, etc., it is crushed by the second crushing unit 130C disposed inside the second unit drying unit 130B. In particular, animal bones, shells, etc. in food waste are crushed to a smaller size by the annular chain 134C, so that drying can be made more easily.

Among the steam, air, and malodorous gases discharged from the first and second unit drying units 130A and 130B, steam and air are generated and discharged as first condensed water in the first condensing unit 150A, and then the steam generating unit ( 180).

Food waste that is dried and discharged in the second unit drying unit 130B is incinerated in the incineration unit 140.

The steam generator 180 generates steam by heating the first and second condensed water with the incineration heat in the incineration unit 140, and the power generation unit 190 receiving the generated steam performs power generation using this Output power of

The waste steam discharged after being used in the power generation unit 190 is supplied to the first heater 134A and then discharged to the second condensing unit 150B, as described above.

In the present invention as described above, drying of the food waste can be achieved by supplying high temperature air to the food waste, the dried food waste can be treated by incineration, and the heat generated during the incineration of the food waste can be Can be used for drying. In addition, the present invention can generate steam during incineration of food waste and use it to generate electricity, and waste steam discharged after electricity generation can be reused for drying food waste, and odor generated during drying of food waste The gas can be processed by burning it in the incineration of food waste.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

100: food waste treatment device 110: input unit
110A: first crushing unit 120: dehydration unit
130: drying unit 140: incineration unit
150A: first condensation unit 150B: second condensation unit
160: preheating unit 170: turbo fan
180: steam generation unit 190: power generation unit

Claims (20)

As a food waste treatment device for treating food waste by incineration, performing power generation using steam produced by using heat generated from incineration, and drying and treating the food waste with heat held by exhaust gas generated from incineration,
An input unit into which food waste is input;
A drying unit for heating and drying the food waste introduced through the input unit to discharge;
An incineration unit for incineration processing the food waste discharged from the drying unit;
A first condensing unit for condensing the steam and generating and discharging first condensed water from among the steam and malodorous gases discharged during drying of the food waste in the drying unit, and supplying the malodorous gas to the incinerator;
A preheating unit for preheating air by using heat held by exhaust gas generated by incineration in the incineration unit and supplying the preheated air to the drying unit;
A steam generator for generating steam using heat held by the exhaust gas generated by the incineration in the incineration unit and the condensed water discharged from the first condensing unit; And
A power generation unit generating electricity by using the steam generated by the steam generation unit;
Food waste treatment device comprising a. The method of claim 1,
A first crushing unit disposed under the input unit to crush and discharge the food waste introduced into the input unit to a uniform size;
A dehydration unit that applies pressure to the food waste to discharge moisture, and moves the food waste to one side to discharge,
A food waste treatment apparatus further comprising a turbo fan that sucks air from the outside, raises the temperature by frictional heat generated by friction between the sucked air and the surface, and supplies it to the preheating unit. The method of claim 2,
The first crushing part,
A shredding unit body providing a shredding space,
A food waste treatment apparatus comprising a pair of crushing gears disposed inside the crushing part main body and engaging with each other by protruding crushing blades on a surface thereof and crushing the food waste. The method of claim 2,
The dehydration unit,
A dehydration unit body having a predetermined size and shape and providing a space for dewatering the food waste,
A screw conveyor that is disposed inside the dehydration unit main body, applies pressure to the food waste flowing into the dehydration unit main body to allow dehydration, and moves the food waste from one side of the dehydration unit main body to the other side to discharge it. convair) and,
A food waste treatment apparatus comprising a dehydration net including a mesh net disposed at a predetermined height below the dehydration unit main body and disposed lower than the screw conveyor. The method of claim 1,
The drying unit,
A first unit drying unit for drying and discharging the food waste using heat of waste steam discharged after generating electricity in the power generation unit,
A food waste treatment apparatus comprising a second unit drying unit for drying and discharging the food waste by supplying air preheated and discharged from the preheating unit to the food waste discharged from the first unit drying unit. The method of claim 5,
The first unit drying unit,
A first drying unit body providing the food waste drying space,
A food waste treatment apparatus comprising a first heater disposed inside the body of the first drying unit and heating and drying the food waste using the steam discharged from the power generation unit. The method of claim 5,
The second unit drying unit,
A food waste treatment apparatus comprising a cylindrical shape in which the rear end from which the food waste is discharged is inclined to be 3 to 5 degrees lower than the front end through which the food waste is introduced. The method of claim 5,
Food waste treatment apparatus for drying the moisture content of the food waste to less than 3wt.%. The method of claim 6,
A food waste treatment apparatus further comprising a second condensing unit generating second condensed water obtained by condensing the steam discharged after use from the first heater and supplying it to the steam generating unit. The method of claim 6,
The food waste treatment apparatus further comprises a second crushing means disposed inside the second unit drying unit to crush the food waste. The method of claim 10,
The second crushing means,
A rotating shaft disposed on the inner central axis of the second unit drying unit and having an annular chain disposed at regular intervals;
Food waste drying apparatus comprising a motor connected to the rotation shaft to rotate the rotation shaft. The method of claim 11,
The food waste treatment apparatus further comprises a cylindrical separation net disposed inside the second unit drying unit, the crushing means disposed inside, and separating water from the food waste. The method of claim 12,
The diameter of the separating net is,
Food waste disposal device that proceeds from one end to the other and increases. The method of claim 13,
The cyclic chain,
A food waste drying device that proceeds from one end of the rotation shaft to the other end and increases in length. The method of claim 1,
The steam generator,
A food waste drying device that generates steam with a temperature of 300~450℃ and a pressure of 25~40 bar. The method of claim 2,
The turbo fan,
A food waste treatment device that raises the temperature of the incoming air to about 40~50℃ and supplies it. The method of claim 2,
The turbo fan,
A food waste treatment apparatus comprising an impeller in which a plurality of projections protrude from the surface. The method of claim 17,
The turbo fan,
The protrusion is a food waste treatment apparatus in the form of a triangular pyramid having a height of 1 to 3 mm. The method of claim 17,
The turbo fan,
Food waste treatment apparatus comprising an impeller having a surface roughness Ra100a (400S, 400Z) to Ra200a (800S, 800Z). The method according to any one of claims 16 to 19,
Food waste treatment apparatus of the rotation speed of the turbo fan is 10000 to 70000 rpm.

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