KR20050024729A - Drying apparatus for organic waste - Google Patents

Abstract

PURPOSE: An organic waste drying device is provided to exchange heat in a counter-flow method by moving oppositely the waste and the hot air and to efficiently dry the waste by the hot air and the conduction heat from an inner drum with passing through an outer drum. CONSTITUTION: A drying drum unit(10) is composed of an outer drum(11) having a waste discharge port at one end; an inner drum(12) supported concentrically at a gap in the outer drum, wherein both opened ends of the inner drum are spaced from both ends of the outer drum; plural waste transfer guide lifters arranged in a matrix on the inner peripheries of each drum and inclined axially to face in the opposite direction; and a hot air guide conduit(14) inserted into the inner drum at the predetermined length with passing through the other end of the outer drum and supported concentrically to the inner drum. A hot air generator(30) has a combustion chamber(31) having an outlet connected to the outer end of the hot air conduit and a burner(36) mounted in the combustion chamber to generate flame therein. A combustion air pre-heating unit(50) covers the outer periphery of the combustion chamber, pre-heats the air by emission heat conducted from the combustion chamber to the atmosphere, and then supplies the pre-heated air to the burner. A waste input unit(20) inserts the waste to one end of the inner drum oppositely to a progressive direction of the hot air. An exhaust unit induces the flow of the hot air to flow the hot air through the inner drum to a space between the outer and inner drums and exhausts the steam generated in drying the waste. A drum driving unit(40) rotates a drying drum in the predetermined direction.

Description

Drying apparatus for organic waste

The present invention relates to a device for drying organic waste, such as food waste or sludge, and in particular, in the rotary hot air drying method, the organic waste and hot air flow direction are mutually enjoyed, and the waste heat of the hot air generating furnace. The present invention relates to an organic waste drying apparatus capable of effectively drying organic waste having a high water content by low consumption energy by preheating the air appropriately and supplying it to a burner.

Recently, the treatment of various wastes generated in large quantities according to the development of the industrial society has emerged as a serious social problem, and among them, there are many difficulties in the treatment of organic waste such as food waste, sludge or sludge. In particular, as the living environment becomes rich, the amount of food waste is greatly increased, and much attention and research are being conducted on its efficient disposal.

Food waste is organic in nature, which contains a large amount of water (about 75% or more) and easily rots, so when landfilled as it is, it causes severe environmental pollution such as soil pollution and groundwater pollution and requires vast landfill sites. In addition, incineration is difficult and the seriousness of the treatment is very high.

Accordingly, the recycling of food waste into livestock feed or soil improvement compost is being actively promoted. To this end, the reduction of water containing food waste must be preceded.

On the other hand, for this purpose, various types of organic waste drying apparatuses are proposed, for example, Korean Utility Model Publication No. 1999-0036907, Patent Registration No. 00316150, and Utility Model Registration No. 0254366.

Utility Model Publication No. 1999-0036907 discloses that a combustion chamber and a hot air spray pipe are installed inside a cylindrical drum into which waste is fed and transported, and the cylinder is dried while rotating, thereby preventing waste from directly touching the flame of the burner. The hot combustion gas passes through the cylindrical drum together with the waste to achieve a high drying effect with less heat.

However, this technique consists of a cylindrical drum that is dried in a single body, in order to dry the garbage enough to configure the cylindrical drum, there is a problem that requires a large installation area due to the large device. In particular, since the conveyance direction of the waste and the advancing direction of the hot air are the same, co-flow heat exchange is performed between the two, and thus it is difficult to expect more than a certain drying efficiency.

Patent Registration No. 0316150 is composed of three shells concentrically installed in a drying furnace where waste is fed and transported, rotated by a motor, and connected to a hot air blower and a hopper at one end of the inner shell, and through an hopper. Garbage introduced into the shell is allowed to dry while sequentially passing each shell in a zigzag form with hot air.

By the way, such a drying apparatus can shorten the length of the drying furnace to make the device compact, so that the installation area can be minimized and the drying efficiency can be expected. Since the heat exchange is achieved, it is difficult to maximize the drying efficiency. In addition, since the hot air fan uses air at room temperature as it is, there is a problem in that fuel consumption is higher than drying efficiency.

On the other hand, Utility Model Registration No.0254366 consists of a double pipe communicating with each other at one end of the drying furnace in which food waste is fed and transported and rotated, and at one end, a burner communicating with the inner and outer cylinders at the same time, and the other end of the discharge communicating with the outer cylinder. A hopper communicating with the means and the inner cylinder is provided respectively, and the waste is U-turned from the inner cylinder to the outer cylinder to improve the drying efficiency.

However, such a drying device is closed because the input end of the inner cylinder is stagnant because hot air supplied from the burner does not flow in the inner cylinder, most of the hot air flows only to the outer cylinder, so that drying in the inner cylinder is not smooth and the drying effect is reduced. In addition, since the outlet of the inner cylinder and the outlet of the burner face each other and a passage to the outer cylinder is formed therebetween, the discharge of steam generated from the inner cylinder is also blocked by the hot air, making it difficult.

In addition, co-flow heat exchange with the same direction of trash and hot air occurs, resulting in less drying effect. Also, an exhaust box is installed in the burner, and heat generated from the burner is leaked to the outside while being supplied to the drying furnace. The drying efficiency is also lowered.

The present invention was devised to solve the above-mentioned problems, and preheats the combustion air to conduction loss heat to the hot air generation while facing the direction of travel of the waste and hot air when drying organic waste such as food waste. The purpose is to provide an organic waste drying apparatus that can greatly improve the drying efficiency while minimizing energy consumption.

Another object of the present invention is to provide an organic waste drying apparatus capable of minimizing the installation area by shortening the length of the drying drum while improving the drying efficiency.

In order to achieve the above objects, the organic waste drying apparatus according to the present invention includes an outer drum having a waste outlet at one end and both ends of which are concentrically supported and open at intervals in the outer drum, respectively, and are spaced apart from both ends of the outer drum, respectively. The inner drum of the drum, a plurality of waste lifter for guiding the waste which are arranged in a matrix on the inner circumference of each drum and inclined along the axial direction so as to face in opposite directions between the drums, and the other end of the outer drum. A drying drum unit which rotates by a predetermined length into the inner drum and consists of a hot air induction pipe which is concentrically supported thereto; A hot air generator having a combustion chamber connected to an outlet at an outer end of the hot air induction pipe, and a burner mounted to the combustion chamber to generate a flame therein; Combustion air preheating means which is installed to surround the outer circumference of the combustion chamber, preheats the air by the heat of emission conducted from the combustion chamber to the atmosphere and supplies it to the burner; Waste injecting means for injecting waste to be dried at one end of the inner drum in a direction opposite to the direction of the hot air; An exhaust unit for discharging steam generated during drying of the waste to the outside while inducing hot air flow such that hot air flows through the inner drum and flows between the outer drum and the inner drum; And drum driving means for rotating the drying drum in a predetermined direction.

According to one preferred feature of the present invention, the combustion air preheating means comprises a housing which encloses the combustion chamber at intervals and has a plurality of air inlet holes on one side thereof and an air outlet on the other side, and the combustion chamber inside the housing. It is arranged at regular intervals to surround the plurality of heat dissipation fins having a notch (notch) for induction of combustion air on a part of the body, and the combustion air induction pipe connecting the air inlet of the housing and the air inlet of the burner.

In the present invention as described above, the transfer direction of the organic waste and the advancing direction of the hot wind are mutually opposed to each other, so that the countercurrent heat exchange is performed between them, and the bar is dried by the conduction heat from the hot wind and the inner drum while passing through the outer drum. The waste can be easily dried.

In addition, by using the waste heat lost to conduction from the hot wind generator to the outside, the combustion air is preheated and then supplied to the burner to reduce the consumption of fuel, and the drying drum has a double pipe structure, which can greatly reduce the size of the device. Will be.

Therefore, the present invention has a great effect on the drying efficiency and reliability of the organic waste drying apparatus, energy saving and installation area reduction.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

1 and 11, the organic waste drying apparatus according to the present invention includes a drying drum unit 10 for drying while transporting the injected waste in a predetermined direction, and food waste and the like in the drying drum unit 10. Waste input means 20 for injecting organic waste to be dried, hot air generator 30 for supplying hot air to the inside of the drying drum unit 10 to face the conveying direction of the waste, and rotating the drum unit 10 The drum drive means 40 and the combustion air preheating means 50 for preheating and supplying the air required for combustion to the waste heat of the hot wind generator 30 and the waste while inducing the flow of the hot air flow in the drying drum unit 10. It consists of an exhaust unit 60 for discharging the steam generated during drying of the outside.

The drying drum unit 10 enters the outer drum 11 and the inner drum 12 and the inner drum 12 which are concentrically supported at intervals inside the outer drum 11 by a predetermined length from one end thereof. It consists of a hot air induction pipe 14 is supported concentrically at intervals with the inner drum 12 to guide the hot air generated in the hot air generator 30 to the inner drum 12, is installed horizontally rotated.

The outer periphery of the outer drum 11 is installed with a heat insulating material (11a) to reduce the heat loss caused by conduction to the atmosphere, the hood (hood: 17a) (17b) for closing the outer drum 11 at both ends thereof Each is equipped. In the center of one hood 17a, a waste inlet for injecting waste to be dried is formed, and a waste outlet for discharging the dried waste is formed in the lower portion thereof. The hot air supply hole for supplying hot air is formed in the center of the other hood 17b.

On the other hand, the discharge screw conveyor 70 for conveying the dried waste discharged therefrom is located below the waste discharge port of one hood (17a).

The inner drum 12 is supported on the outer drum 11 by a plurality of supports 13 arranged radially between it and the outer drum 11. These supports 13 are disposed at appropriate intervals along the longitudinal direction of the inner drum 12.

The inner drum 12 is open at both ends and has a length shorter than the outer drum 11 so that both ends are appropriately spaced from the corresponding ends of the outer drum 11, respectively, so that the outer drum 11 is at both ends. In full communication with This is to allow the waste and hot air to pass through the inner drum 12 to face each other, and then move to the outer drum 11 to pass through the outer drum 11.

Therefore, it is preferable that the distance between both ends of the inner drum 12 and the outer drum 11 is relatively wider than the side where the waste moves.

On the other hand, as shown in Figures 2 to 6b a plurality of lifters 18 for transferring the waste in a predetermined direction while stirring the waste by the rotation of the drying drum unit 10 on the inner circumference of the outer drum 11 and the inner drum 12 19 are installed to protrude. Each lifter 18, 19 is arranged in a matrix and inclined at an appropriate angle with respect to the axial direction.

By the way, the waste should be moved in the opposite direction from the outer drum 11 and the inner drum 12, as shown in Figure 6a and 6b lifters 18, 19 provided in each of the inner circumference It is arranged to be inclined in opposite directions to each other.

These lifters 18 and 19 can be configured in a variety of forms, for example in a simple plate form as shown in FIG. 7A or as easily shown in FIG. 7B and FIG. 7C. The tip portions 18a and 19a may be bent so as to be bent at the tip so that they are preferably mixed and disposed in a proper form.

Hot air induction pipe 14 is to induce hot air to the inner drum 12 so that the hot air generated in the hot air generator 30 flows U-turn to the outer drum 11 through the inner drum 12, It properly enters the inner drum 12 for smooth flow.

On the other hand, the hot air generated in the hot air generator 30 is a considerable high temperature of about 700 ~ 800 ℃ bar, hot air induction pipe 14 is heated sweetly, and thus the waste moving along the inner drum 12, stirring action By direct contact with the surface by the high temperature heat corrosion occurs in the hot air induction pipe 14 as well as carbonization may occur on the surface. Therefore, the hot air induction pipe 14 is preferably made of a material having excellent heat resistance and corrosion resistance, and the fire resistant heat insulating material 14a is preferably constructed on the inner circumference thereof.

In addition, since the hot air induction pipe 14 generates thermal expansion due to high temperature, the hot air induction pipe 14 is preferably supported by the expansion absorbing structure with respect to the inner drum 12 so as to maintain concentricity while preventing damage caused by thermal expansion.

To this end, the hot air induction pipe 14 is radially formed on the inner circumference of the inner drum 12 with a plurality of spring plates 15 having radially long holes 15a at their free ends, for example, as shown in Figs. Arrangement and fixing, by installing a bracket 16 having a connecting pin 16a on the outer circumference of the hot air induction pipe 14 to slidably couple the connecting pin 16a to the long hole 15a of the spring plate 15 It is supported by the inner drum 12.

The waste injecting means 20 is composed of a hopper 21 and an injecting screw conveyor 22 for injecting dry waste to be injected into the hopper 21 toward the hot air discharge end of the inner drum 12. . The input screw conveyor 22 has its discharge end properly entered into the inner drum 12 through a waste input hole provided in one hood 17a of the drying drum unit 10.

The hot air generator 30 is composed of a combustion chamber 31 and a burner 36 mounted on the rear end of the combustion chamber 31 to generate flame in the combustion chamber 31, as shown in FIG. A refractory heat insulating material 32 is installed on the inner circumference of the combustion chamber 31, and the hot air discharge ports 33 protruding from one end thereof are dried through hot air supply holes provided in the other hood 17b of the drying drum unit 10. It is connected to the outer end of the hot air induction pipe (14) of the drum unit (10).

By the way, since the hot air induction pipe 14 of the drying drum unit 10 is rotated while the hot air generator 30 is fixed, both of them require rotary jointing in which high temperature hot air does not leak.

Accordingly, the hot air induction pipe 14 of the drying drum unit 10 and the hot air outlet 33 of the hot air generator 30 are, for example, well illustrated in FIG. 3, in consideration of thermal expansion at a free end thereof. After attaching a connecting pipe 34 having a flange 34a having an outer diameter smaller than the inner diameter of 14 to the front end of the hot air outlet 33, and fitting it into the inside of the hot air induction pipe 14, the hot air induction pipe 14 The outer end of the connection pipe 34 has an inner diameter larger than the outer diameter of the independent ring flange 35 is connected by fastening with a bolt (35a).

At this time, the front end portion of the connecting pipe 34 enters a predetermined length into the hot air induction pipe 14, and a space is formed between the two flanges 34a and 35 to blow into the hot air induction pipe 14 through the connection pipe 34. In addition to preventing leakage caused by the positive pressure (+) of the hot air, the inflow of external airflow is effectively prevented.

That is, each of the flanges 34a and 35 is expanded by the high temperature hot air to be in close contact with the inner circumference of the hot air induction pipe 14 and the outer circumference of the connecting pipe 34, thereby sealing the space between the two to function as a blocking layer. By doing so, leakage of high temperature hot air and inflow of room temperature airflow are prevented.

1 and 2, the drum drive means 40 includes a motor 41 having a sprocket wheel 42 on a rotating shaft and an external drum 11 of the drying drum unit 10. As shown in FIG. It is installed on the outer periphery and is disposed at appropriate intervals along the longitudinal direction of the driven sprocket wheel 43 and the outer drum 11 connected to the drive sprocket wheel 42 and the chain 44 to guide the rotation of the drying drum unit 10. It consists of a plurality of rotation support unit 45 for supporting.

The rotary support unit 45 includes two tires 46 mounted protrudingly on the outer circumference of the outer drum 11, and two support rollers rotatably supported by the frame 48 and rolling on the tires 46. 47).

The combustion air preheating means 50 includes a housing 51 which is installed to surround the combustion chamber 31 of the hot air generator 30 at intervals as shown in FIG. 8, and the combustion chamber inside the housing 51. Induction of combustion air to guide the burner 36 of the hot air generator 30 to the preheated air heated in the housing 51 and the plurality of heat-dissipating fins 54 and heat exchange with the inlet air installed to surround the 31 at a predetermined interval. It consists of a tube 55.

As shown in FIG. 9, a plurality of air inlet holes 52 are formed at appropriate angle intervals on the front surface of the housing 51, and one end of the combustion air induction pipe 55 is connected to the outer periphery of the rear end of the housing 51. Preheated air outlet 53 is formed.

As shown in Fig. 10, the heat dissipation fin 54 takes the form of an approximately C ring having a notch 54a formed by cutting a portion of the ring-shaped body, and is made of a material having excellent thermal conductivity and good heat resistance. The notch 54a functions as a flow path for guiding the outside air entering the air inlet hole 52 of the housing 51 to flow inside the housing 51.

Accordingly, the heat dissipation fins 54 are mutually arranged such that the notches 54a are displaced from the notches 54a of the adjacent heat dissipation fins 54, preferably such that the notches 54a of the adjacent heat dissipation fins 54 are disposed at 180 ° with each other. Alternately placed. This is to allow the external air introduced into the housing 51 to be sufficiently heat exchanged while completely passing through the internal space of the housing 51 partitioned by the heat dissipation fins 54 and then moved to the subsequent space.

As shown in Fig. 11, the exhaust unit 60 is connected to an exhaust duct 61, an exhaust fan 62 provided at the outlet side of the exhaust duct 61, and an inlet side of the exhaust duct 61, Is introduced into the drying drum unit 10 through the other hood 17b, and consists of an induction duct 63 for attracting steam generated at the time of drying the waste to the outside.

The induction duct 63 is supplied to the inner drum 12 by distal end portion entering the inner drum 12 and the outer drum 11 by a predetermined length to form a negative pressure (-) at the hot air discharge end of the outer drum 11. The first induction duct 64 for inducing the hot air to flow U-turn to the outer drum 11 after passing therethrough, and the inner and outer drums 12 so that the tip faces the hot air supply end of the inner drum 12. A second induction duct positioned in a space formed by the 11 and the hood 17b to suck steam generated from the inner drum 12 and steam generated from the waste falling from the inner drum 12 to the outer drum 11. It is made of 65.

Preferably, the first and second induction ducts 64 and 65 are respectively provided with dampers 66 and 67 so as to adjust the size of the flow path as necessary to control the discharge of steam according to the dry state.

Next, the operation of the organic waste drying apparatus according to the present invention configured as described above will be described.

When the device is operated, the drive sprocket wheel 42 is rotated by the motor 41 of the drum drive means 40, so that the driven sprocket wheel 43 connected with the drive sprocket wheel 42 and the chain 44 is By rotating in the same direction, the drying drum unit 10 is rotated in a predetermined direction. At this time, since the inner drum 12 and the hot air induction pipe 14 are supported concentrically on the outer drum 11, they rotate together.

At the same time, the burner 36 which uses liquid or gas fuel as a heat source is ignited to generate a flame in the combustion chamber 31, thereby generating hot air having a high temperature (700 to 900 ° C). At this time, the external air for combustion flowing into the burner 36 is supplied in a sufficiently heated state while passing through the combustion air preheating means 50 installed to surround the combustion chamber 31.

When the burner 36 is operated, the external air at room temperature is sucked through the air inlet hole 52 formed in one side of the housing 51 of the combustion air preheating means 50 and then through the notch 54a of the heat radiation fin 54. It is heated by the heat dissipated therefrom evenly across the outer circumference of the combustion chamber 31, and thus is supplied to the burner 36 through the combustion air induction pipe 55 in a state of being preheated to about 60 to 70 ° C. Therefore, the fuel consumption of the burner 36 is reduced by that amount.

The hot air generated by the hot air generator 30 is supplied into the inner drum 12 through the hot air induction pipe 14 of the drying drum unit 10, and the hot air supplied to the inner drum 12 is exhausted. The fan 62 and the first inductor 64 pass through the inner drum 12 and are then diffracted to flow in the outer drum 11.

That is, the inner drum 12 is configured to be shorter than the outer drum 11 so that a constant distance is maintained between both ends thereof and corresponding ends of the outer drum 11, and the first inductance 64 of the exhaust unit 60 is When the internal pressure of the hot air generator 30 is properly entered between the internal and external drums 12 and 11, and a negative pressure is formed therein by the exhaust fan 62, the hot air supplied to the internal drum 12 is supplied to the internal drum 12. After passing through the U-turn to the outer drum (11) will flow.

At this time, the opposite end of the inner drum 12 is also open and the second induction duct 65 is positioned opposite thereto, but the hot air of the drying drum unit 10 has entered into the inner drum 12 to a sufficient depth. Since the hot air induction pipe 14 is supplied to a deep position of the inner drum 12, the inner drum 12 and the outer drum 11 are sequentially flowed without backflow.

On the other hand, when the high temperature hot air passes through the hot air induction pipe 14, the hot air induction pipe 14 is thermally expanded while being heated by hot air reaching 700 to 800 ° C, and the hot air induction pipe 14 of the present invention is Since the connecting pin 16a is supported by the radially long hole 15a of the spring plate 15 fixed to the inner circumference of the inner drum 12, the connecting pin 16a is formed as shown in FIG. By moving along 15a), thermal expansion can be effectively absorbed to prevent consequent damage and maintain concentric support.

In this state, when the waste to be dried, such as food waste, is introduced into the hopper 21 of the waste input means 20 located on the opposite side of the hot air generator 30, the waste is a waste input screw conveyor installed in the lower portion of the hopper 21. Along the 22 is injected into the end opposite to the hot air supply end of the inner drum (12).

As shown in FIG. 2, the waste introduced into the inner drum 12 is uniformly stirred by the rotating drum unit 10 while being transported in the opposite direction to the hot wind generator 30, that is, facing the traveling direction of the hot wind. As soon as the hot air is in progress, preheating and drying are performed.

In more detail, the inner circumference of the inner drum 12 is provided with a plurality of lifters 19 in a matrix form so as to be inclined appropriately, the lifter 19 to spread the waste by the rotation of the inner drum 12 Thus, the waste loaded on the lifter 19 is gradually transported by sliding along the inclination of the lifter 19. At the same time, when the lifter 19 pumping the waste reaches a predetermined level position by the rotation of the inner drum 12, the dumped waste falls from the lifter 19 by its own weight and is evenly stirred to uniform all parts of the waste. Be exposed to hot air.

Therefore, the waste introduced initially meets the hot dry hot air discharged from the hot air induction pipe 14 during the preheating period while being transported with stirring as described above, and in particular, the counterflow heat exchange with excellent heat exchange efficiency is achieved by opposing each other. The evaporation temperature is reached quickly in the section.

And when the waste reaches the evaporation temperature passes through the hot wind running section of the internal drum 12, the hot air induction pipe 14 installation section of the waste heat conduction heat and lifter 19 By agitation, the evaporation heat is absorbed while properly contacting the surface of the hot air induction pipe 14, thereby performing surface drying (evaporation).

At this time, since the hot air induction pipe 14 is also rotated with the inner drum 12, the waste transported by stirring does not stay in the hot air induction pipe 14, thereby slipping, so that hot hot corrosion or carbonization occurs on the surface of the hot air induction pipe 14. No adverse phenomenon such as adhesion occurs.

Subsequently, the waste that has passed through the inner drum 12 falls to the outer drum 11 through a space provided between the waste outlet end and the corresponding end of the outer drum 11, and the waste dropped to the outer drum 11. Is transported while stirring toward the hopper 21 by the rotation of the outer drum (11).

That is, the lifters 18 protrude in a matrix on the inner circumference of the outer drum 11 so as to be inclined in the opposite direction to the lifter 19 of the inner drum 12, and thus, as in the aforementioned inner drum 12, rotation is performed. The wastes are gradually transported by the lifters 18 being agitated in a direction opposite to the transport in the inner drum 12.

In this way, while passing through the outer drum 11, the waste is preheated to the evaporation temperature of the waste initially introduced from the inner drum 12, and then the hot air passing through the outer drum 11 and conduction heat dissipated from the surface of the inner drum 12. By this process, the complete drying process is carried out through some evaporation period (surface drying) and reduction rate period (internal drying).

That is, the surface of the inner drum 12 is maintained at a constant temperature by the hot air flow and evaporative heat flowing therein, while the waste is agitated and transported by the lifters 18 attached to the inside of the outer drum 11. While in contact with the surface of the inner drum 12 absorbs heat in the conduction hydrothermal method and at the same time it is guided to the outer drum 11 by the first induction duct 64 and in contact with the hot air flowing opposite the conveying direction of the waste Evaporation and decay are accelerated to complete drying.

Thus, the waste dried while passing through the inner drum 12 and the outer drum 11 of the drying drum unit 10 in sequence through the waste outlet of one hood 17a is attached to the discharge screw conveyor 70 below Are taken off as.

On the other hand, the steam generated while the waste is dried through the preheating, evaporation, and desensitization period is easily induced and discharged to the outside by the exhaust unit 60 installed at the end portion of the hot air generator 30 of the drying drum unit 10.

The evaporation stream generated from the inside of the inner drum 12 and the evaporation stream generated from the waste falling from the inner drum 12 to the outer drum 11 are disposed to face the waste discharge end of the inner drum 12. Is sucked into the second induction duct 65 and discharged to the outside through the exhaust duct 61, and the evaporation air generated in the outer drum 11 is one end between the inner and outer drums 12 and 11 It is discharged through the first induction duct 64 which enters.

At this time, the amount of airflow sucked into the first and second induction ducts 64 and 65 is appropriately adjusted by dampers 66 and 67 respectively provided to them according to the dry state.

As described above, according to the organic waste drying apparatus according to the present invention, the waste to be dried and the hot air flow to face each other, so that the countercurrent heat exchange is performed between the two, as well as the conducting hydrothermal method from the hot air and the inner drum while passing through the outer drum. Due to the parallel drying, waste can be easily dried as compared with the related art.

In addition, by using the waste heat that is lost to conduction from the hot wind generator to the outside, the combustion air is preheated and then supplied to the burner to reduce the consumption of fuel, and the preheating means surrounds the surface of the hot wind generator. Even inadvertent contact prevents severe burns.

Moreover, while the drying drum has a multi-pipe structure, it is possible to construct a sufficient drying furnace and the size of the device can be greatly reduced, thereby minimizing the installation area.

Therefore, the present invention has an excellent effect that greatly contributes to the drying efficiency and reliability of the organic waste drying apparatus, energy saving and installation area reduction.

1 is a partial cutaway front view schematically showing an organic waste drying apparatus according to the present invention;

2 is a cross-sectional view taken along the line II-II of FIG. 1;

3 is a cross-sectional view showing a drying furnace of the drying apparatus of the present invention;

4 is a cross-sectional view taken along line IV-IV of FIG. 3;

Figure 5 is an excerpt side view taken along the line V of Figure 4,

6 is an exploded view showing an internal cylinder of the drying furnace of the present invention drying apparatus;

7a to 7c are perspective views showing the transfer tabs of the drying furnace,

8 is a cross-sectional view showing a hot air generating path of the drying apparatus of the present invention;

9 is a cross-sectional view taken along line VII-VII of FIG. 8;

10 is a cross-sectional view taken along line VII-VII of FIG. 8;

11 is a plan view showing an exhaust unit of the drying apparatus of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: dry drum unit 11: outer drum

12: inner drum 14: hot air induction pipe

15: spring plate 15a: long hole

16a: connection pin 17a, 17b: hood

18, 19: lifter 20: waste input means

30: hot air generator 31: combustion chamber

36: burner 40: drum drive means

50: combustion air preheating means 51: housing

52: air inlet hole 54: heat radiation fin

54a: notch 60: exhaust unit

62: exhaust fan 64, 65: first and second induction duct

66,67: damper

Claims (7)

An outer drum having a waste outlet at one end, and an inner drum having both ends concentrically supported and open at intervals in the outer drum, the inner drum being spaced apart from both ends of the outer drum, and arranged in a matrix on the inner circumference of each drum; A drying drum which consists of a plurality of waste transfer guide lifters inclined along an axial direction so as to face in the opposite direction, and a hot air induction pipe that enters a predetermined length into the inner drum through the other end of the outer drum and is supported concentrically. unit; A hot air generator having a combustion chamber having an outlet connected to an outer end of the hot air induction pipe, and a burner mounted to the combustion chamber to generate a flame therein; Combustion air preheating means which is installed to surround the outer circumference of the combustion chamber and preheats the air by the emission heat conducted from the combustion chamber to the atmosphere and supplies it to the burner; Waste injecting means for injecting waste to be dried to one end of the inner drum in a direction opposite to the direction of the hot air; An exhaust unit for discharging steam generated during drying of the waste to the outside while inducing hot air flow so that the hot air flows through the inner drum and flows between the outer drum and the inner drum; And a drum driving means for rotating the drying drum in a predetermined direction. According to claim 1, wherein the combustion air preheating means, Wraps the combustion chamber at intervals and has a plurality of air inlet holes on one side thereof and an air outlet on the other side, and is arranged at regular intervals so as to surround the combustion chamber inside the housing, and the combustion air is part of the body. Organic waste drying apparatus comprising a plurality of heat dissipation fins having induction notches, and combustion air induction pipe connecting the air outlet of the housing and the air inlet of the burner. 3. The organic waste drying apparatus according to claim 2, wherein the heat exchange fins are formed substantially in a C shape and are arranged such that each notch is crossed with each other. The method of claim 1 or 2, wherein the exhaust unit, An exhaust duct, an exhaust fan provided at an outlet side of the exhaust duct, and a first inductor and a tip connected to the inlet side of the exhaust duct, respectively, having a leading end that enters an appropriate depth between the inner drum and the outer drum at the other end thereof Organic waste drying apparatus, characterized in that consisting of a second induction duct positioned to face the other end of the drum. 5. The organic waste drying apparatus according to claim 4, wherein dampers for adjusting the amount of air flow are respectively provided in the first and second induction ducts. The method according to any one of claims 1, 2, 3 or 5, The hot air induction pipe of the drying drum unit has a plurality of spring plates radially fixed to the inner circumference of the inner drum with a long hole in the radial direction, the connection is fixed to the outer circumference of the hot air induction pipe movably fitted into the long hole of the support plate Organic waste drying apparatus characterized in that supported by the pin to the inner drum to compensate for thermal expansion. The combustion chamber according to claim 1 or 2, wherein a flange having an outer diameter smaller than the inner diameter of the hot air induction pipe is installed at the outlet end of the combustion chamber and inserted into the hot air induction pipe, and the combustion chamber is located at the outer end of the hot air induction pipe. Organic waste drying apparatus characterized in that the hot air generator is connected to the drying drum unit by fastening a ring flange having an inner diameter larger than the outer diameter of the outlet.