KR101279156B1 - High efficient waste Dryer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer for drying a large amount of food waste and various sludges, livestock meals, and various livestock wastes (hereinafter collectively referred to as "waste"). The present invention relates to a dryer that maximizes energy efficiency by drying various wastes by using a direct heat convection method and an indirect heat conduction method. The present invention transfers the indirect heat to the inside of the dry moving pipe 200, the screw 300 for moving the dry object, the dry moving pipe 200 to dry the dried material is supplied from the heat source 100 is introduced It consists of an indirect heat transfer pipe 400 surrounding the outer circumferential surface of the dry moving pipe 200, the extinguishing fluid storage 500 for extinguishing when ignited in the dry moving pipe 200.

Description

High efficient waste dryer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer for drying a large amount of food waste and various sludges, livestock meals, and various livestock wastes (hereinafter collectively referred to as "waste"). The present invention relates to a dryer that maximizes energy efficiency by drying various wastes by using a direct heat convection method and an indirect heat conduction method.

As the industry develops and life is better, the amount of waste is increasing. These wastes include food waste generated in daily life, sludge produced in various water treatment processes in sewage and wastewater treatment plants, and livestock waste generated in various barns.

Environmental regulations on the disposal of wastes are being tightened, and about 50% of the wastes have been disposed of by dumping at relatively low disposal costs. Starting in 2012, sewage sludge and livestock manure cannot be disposed of in 2013 by food waste. Land treatment is inevitable.

Various methods for optimizing the treatment of waste have been studied. One of them is drying and recycling. In the method of drying wastes, the convective heat drying method (the hot air drying method or the direct heating method is the same concept) for drying by passing the hot air through the dry object, and the conduction heat for drying the dried material in the form of heat conduction in terms of heating by heat medium. There are two methods, drying method (indirect heating drying method).

Dryers using the convective heat drying method include rotary dryers, band dryers, airflow dryers, and fluidized bed dryers. Conductive heat drying type dryers include a disk dryer, a paddle dryer and a thin film dryer.

If the moisture generated during the drying process cannot be removed immediately, the drying efficiency tends to be deteriorated due to this moisture, and organic sludge (organic wastewater sludge, animal waste or Phosphorus, etc.), the drying efficiency is reduced due to the interaction of organic components with moisture.

In the drying method of the waste, the convective heat drying method has the advantage of being able to treat wastes having high thermal efficiency, short drying time, high water content, and high adhesion. Due to the large size of the facilities, the cost of machinery is increased, there is concern about the emission of harmful gases (including odors), and there is a danger of fire caused by organic substances or dust by applying direct heat.

Conductive heat drying method has the advantage that the drying proceeds in an enclosed space is less odor or dust generation. Due to the long residence time, the drying efficiency decreases and most of them are transported by screws, so the contact area with heat is small during the transfer, and the processing cost increases due to the decrease in thermal efficiency. Since a separate heating medium heating device is required, the initial investment cost is increased and maintenance is difficult.

The present invention for solving the above problems is to maximize the utilization of the heat required for drying the dried material to reduce the treatment cost. The present invention is to solve the problems of the ignition in the dryer that can occur when drying the drying of the drying to ensure the safety of the operation, and to ensure the structural stability and durability according to the thermal deformation (extension) of the dryer according to the drying of the drying at high temperature To do so.

On the other hand, the present invention has a problem that the drying efficiency caused by the reduction of the heat transfer of the conduction heat is reduced as the dried material generated when the dried object is dried inside the dryer adhered to the inner wall of the dryer. In order to solve this problem is to provide a cross-sectional shape of the moving pipe and the screw provided therein.

The present invention for solving the above problems is the heat source (100); The main inlet 210 is provided so that the heat of the heat source 100 is introduced into the inside, the heat source 100 introduced into the main inlet 210 is a passage that is discharged after being utilized as drying heat for drying the dried material. A dry moving pipe (200) having a main outlet (220), a dry product input port (230) into which the dry item is input, and a dry product discharge port (240) discharged after the input dry item is dried; And a spiral flight 310 and 310a and the flight 310, which are provided inside the dry moving tube 200 and move the dry object introduced from the dry object inlet 230 to the dry outlet 240. Screw 300 is connected to the inner end of the 310a is provided with a rotation shaft (320, 320a) for rotating the flight (310, 310a); Including, but the rotating shaft (320, 320a) of the screw 300 is fixed to both ends of the cylindrical moving tube 200 is rotated, the rotating shaft (320, 320a) is a moving tube 200 Is provided spaced downward from the central axis (C) by a predetermined distance, the outer peripheral surface of the spiral flight (310, 310a) has an elliptical cross-sectional shape as seen in the axial direction of the rotation shaft (320, 320a), or The dry moving pipe 200 has an elliptical cross-sectional shape as seen in the axial direction.

On the outer circumferential surface of the dry moving pipe 200 of the present invention, the indirect heat inlet that surrounds the outer circumferential surface of the dry moving pipe 200 in order to transfer indirect heat to the inside of the dry moving pipe 200, and heat is introduced ( 410, the indirect heat outlet 420 through which the introduced heat is discharged, and the introduced heat are formed to protrude from the outer circumferential surface of the to-be-dried pipe 200 so as to flow in a spiral while surrounding the outer circumferential surface of the dry-dried pipe 200. The indirect heat transfer pipe 400 including the partition wall 430 is provided.

One side of the main inlet 210 provided in the dry moving pipe 200 of the present invention is to be extinguished when ignited dry matter dried inside the dry moving pipe 200 by the heat flowing from the heat source 100 Fire extinguishing fluid storage 500 is further provided, the extinguishing fluid of the extinguishing fluid storage 500 is in communication with the main inlet 210, or with a separate inlet provided on one side of the dry pipe 200 Can be communicated.

The rotating shaft 320 of the screw 300 of the present invention is provided with a flow path 321 inside the hollow shaft, the auxiliary inlet 322 on one side of the rotating shaft 320, the auxiliary outlet 323 on the other side, respectively Is provided, the external air may be introduced to the auxiliary inlet 322 and discharged to the auxiliary outlet (323).

An end portion of the flight 310 provided in the screw 300 of the present invention may further include a locking step 311 protruding by a predetermined length in the longitudinal direction of the rotation shaft 320.

One side end of the rotary shaft 320 of the present invention is further provided with a heat deformation preventing means 600, the heat deformation preventing means 600, a bearing (610) for supporting the rotation of the rotary shaft 320; A slider 630 fastened to the bearing 610 and moved together in the longitudinal direction of the rotating shaft 320 along the expansion and contraction of the dry moving pipe 200 and the indirect heat transfer pipe 400; A guide shaft 640 for guiding the movement of the slider 630; And a fixing part 650 for supporting and fixing the guide shaft 640.

The heat deformation preventing means 600 of the present invention, the support portion 660 provided on the outer peripheral surface side of the dry pipe 200 or the indirect heat transfer pipe 400 and the roller fastened to the lower side of the support portion 660 ( 670 may be further included.

A rotary valve 700 is further provided at an upper portion of the dry object inlet 230 of the present invention, and when the dry object is input into the dry object inlet 230, the inflow of external air is blocked to allow the dry object moving tube 200. The internal temperature drop can be prevented.

The outer peripheral surface of the screw 300 of the rotating shaft 320a of the present invention is provided with a frame 315 protruding radially in the circumferential direction, the spiral end 310a is connected to the other end of the frame 315, A space 316 may be formed between the rotation shaft 320a and the flight 310a.

The present invention maximizes the utilization of the heat required for drying the construction to reduce the treatment cost. The present invention fundamentally blocks the risk of ignition that may occur during drying of the dry goods by using wet hot air without using the hot air dried by direct heat, and in the combustor when igniting inside the dryer that may occur during drying of the dry goods. It is possible to extinguish a fire at the time of ignition by providing a configuration for spraying the extinguishing fluid. As the dried material was dried under high heat, structural stability due to thermal deformation (stretch) of the dryer was ensured.

In addition, the present invention provides a cross-sectional shape of the drying pipe and the screw provided therein to reduce the heat transfer effect of the indirect heat due to the adhesion phenomenon on the dryer wall of the drying object when the drying is dried in the interior of the dryer. Solved.

1 is a conceptual diagram showing a cross-sectional side of the dryer according to the present invention.
Figure 2 is a conceptual diagram showing a cross-sectional shape according to the rotation angle of the flight of the present invention.
3 is a conceptual diagram showing a waveform according to the rotation of the present invention flight.
Figure 4 is a conceptual diagram showing in detail the heat deformation preventing means of the present invention.
5 is a conceptual diagram showing a rotary valve of the present invention.
Figure 6 is a conceptual diagram showing a cross section of the screw in the present invention.
7 is a conceptual diagram showing a cross-sectional side of the dry moving tube of the present invention.

The present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram showing a cross-sectional side of the dryer according to the present invention. Referring to Figure 1, the present invention, the heat supplied from the heat source 100 is a dry moving tube 200 for drying the dry object, a screw 300 for moving the dry object, the dry object moving tube 200 Indirect heat transfer pipe 400 surrounding the outer circumferential surface of the dry moving pipe 200 to deliver the indirect heat to the inside, made of a fire extinguishing fluid storage 500 for extinguishing when ignited in the dry moving pipe 200.

It will be described in more detail with reference to FIG. Referring to FIG. 1, the heat source 100 is used as a means for supplying direct heat or indirect heat to a dry object. In particular, the heat source 100 may supply a dry air by utilizing a combustor (not shown) in which thermal power is used. More preferably, it is preferable to use superheated steam (wet air) of about 200 ° C. or more as the heat source 100. The superheated steam increases the value of the film heat transfer coefficient at a temperature above the inversion point temperature, thereby increasing the drying speed of the dry matter more than when using the dry air. Can be prevented fundamentally. The heat of the heat source 100 is introduced into the main inlet 210 of the building moving pipe 200 to be described later. On the other hand, the outside air (outer air) is introduced into the auxiliary inlet 322 provided at one end of the rotating shaft 320 of the screw 300 to be described later can prevent the thermal deformation due to the temperature rise of the screw 300.

Referring to Figure 1 will be described with respect to the dried pipe 200. The dry moving pipe 200 includes a main inlet 210 through which heat of the heat source 100 is introduced, a main outlet 220 through which the inflowed heat is discharged, a dry object inlet 230 into which the dry item is input, and an input dry item. The dry matter discharge port 240 discharged after the drying is provided. The dry matter injected into the dry matter inlet 230 starts to dry due to a temperature increase due to the heat introduced into the main inlet 210, and the dried matter is dried in accordance with the rotation of the screw 300 to be described below. Start to move in the longitudinal direction of the discharged to the discharge outlet 240. The dried items are stored and recycled in a separate storage means for storage. On the other hand, gas, steam, and the like generated during drying are discharged through the main outlet 220. Gas, water vapor, and the like discharged through the main outlet 220 may be purged through a purifier (not shown) and then discharged to the outside air. More preferably, the discharged gas, water vapor, etc. are heated in a heat source generator (Fig. '100' or a separate heat source) to be recycled into the drying heat of the dryer to make high temperature wet air and put it into the indirect heat inlet 410. It can also be used as indirect heat for drying the building material. Gas and water vapor generated in the dryer of the present invention increases the pressure in the drying chamber, and increases the humidity to provide a cause of reducing the drying efficiency of the dry matter, in order to prevent this blower 800 to the main outlet 220 side It was equipped to be quickly discharged.

Meanwhile, referring to FIG. 2, when the screw 300 has an elliptical shape, the cross-sectional shape of the dry moving pipe 200 is circular. The dry moving pipe 200 and the indirect heat transfer pipe 400 have a cylindrical shape having the same center (O). On the other hand, referring to Figure 7, when the screw 300 has a circular shape, the cross-sectional shape of the dry moving pipe 200 has an elliptical shape. Due to such a structure, it is possible to prevent the adhered object to the inner wall of the to-be-dried pipe 200 more specifically from the inner wall of the to-be-dried pipe 200 during the drying process.

The screw 300 will be described in detail with reference to FIG. 1. The screw 300 is provided in the inside of the to-be-dried pipe 200 and has a spiral flight 310 and a flight 310 for moving the dry matter inputted from the dry matter inlet 230 to the dry outlet 240. It is connected to the inner end has a rotation shaft 320 for rotating the flight 310. 1 and 2, the rotating shaft 320 of the screw 300 is spaced downward from the central axis C of the cylindrical moving tube 200 by a predetermined distance. This is to provide a passage such as gas and water vapor generated during drying of the object to be dried.

Referring to the enlarged view of Figure 1, the end of the flight 310 provided in the screw 300 is provided with a locking projection 311 protruding by a predetermined distance in the longitudinal direction of the rotating shaft (320). The end of the flight 310 is bent by a predetermined angle. This is to move in the longitudinal direction of the dry pipe 200 while efficiently dispersing the dry matter stacked in the dry pipe 200.

Meanwhile, referring to FIG. 6, a frame 315 is protruded radially toward the circumferential direction on the outer circumferential surface of the rotating shaft 320a of the screw 300, and a spiral flight 310a is formed at the other end of the frame 315. May be connected to form a space 316 between the rotation shaft 320a and the flight 310a. The space portion 316 is formed to extend in the longitudinal direction of the rotation shaft 320a, so as to increase the drying efficiency by more efficiently contacting the hot air during the movement of the object.

Referring to FIG. 2, the center O of the virtual circle of the building moving tube 200 and the center O of the virtual circle of the indirect heat transfer tube 400 are designed to coincide. On the other hand, the center 320 of the flight outer circumferential surface 330 of the present invention is positioned spaced downward by a predetermined distance from the center O of the above-described circle. Here, the center of the flight outer circumferential surface 330 means the center of the rotation shaft 320. Referring to FIG. 2, the flight outer circumferential surface 330 of the present invention was elliptical when orthogonally projected in the axial direction of the rotating shaft 320.

As shown in FIG. 2, when the outer peripheral surface of the flight has a circular shape, the drying efficiency decreases as the dry matter adheres to the inner circumferential surface side of the dry moving pipe 200 when the dry object is dried. 'A' of FIG. 2 means a cross-sectional area of the dry matter to be adhesively solidified. That is, if the flight outer circumferential surface 330a is circular when the orthogonal projection is performed in the axial direction of the rotary shaft 320, the object to be dried is adhesively solidified by the hatched area A of FIG.

On the other hand, as shown in Figure 2, when the flight outer peripheral surface 332 is provided with an oval (showing a total of eight states depending on the rotation angle (0 ° ~ 315 °)) there is no dry matter to be solidified adhesive It can be seen that, or removed.

3, in the elliptical flight outer circumferential surface 332, the elliptical flight outer circumferential surface has an area gain compared to the circular outer circumferential surface as the elliptical flight has a long axis and a short axis.

Referring to Figure 1, the indirect heat transfer pipe 400 will be described in detail. As the heat source of the indirect heat, a dry air may be supplied using a combustor (not shown) as described above. More preferably, it is preferable to utilize superheated steam of about 400 ° C. or more supplied from the heat source 100 or other heat sources (wet air or high temperature wet air made by heating oil vapor generated during drying).

Indirect heat transfer pipe 400 of the present invention was to wrap the outer peripheral surface of the dry pipe 200 to transfer the indirect heat to the inside of the dry pipe 200. That is, the indirect heat transfer pipe 400 spirals while the indirect heat inlet 410 through which heat is introduced, the indirect heat outlet 420 through which the inflowed heat is discharged, and the introduced heat surround the outer circumferential surface of the dried pipe 200. The partition wall 430 is formed to protrude from the outer circumferential surface of the to-be-dried pipe 200 to flow therethrough. The heat introduced due to this structure is discharged to the indirect heat outlet 420 of the indirect heat transfer pipe 400 while spirally wrapping the outer circumferential surface of the dried pipe 200. On the other hand, in order to prevent the heat loss to the outside of the indirect heat transfer pipe 400, it is preferable to insulate the outside of the indirect heat transfer pipe 400.

This indirect heat transfer pipe 400 can of course prevent the heat loss of the building moving pipe 200, and furthermore can be utilized for drying the dry goods by supplying indirect heat to the interior of the building moving pipe (200). will be.

With reference to Figure 1 will be described in detail for the digestive fluid reservoir 500. Digestive fluid storage 500 is to extinguish this when ignited due to overheating inside the dry moving pipe (200). Digestive fluid means water or nitrogen. Referring to FIG. 1, it is preferable to determine whether the extinguishing fluid reservoir 500 is opened by using a three-way valve (not shown) on the conduit flowing from the heat source 100 to the main inlet 210. On the other hand, by providing a separate inlet (not shown), of course, the digestive fluid may be introduced into the dry building moving pipe (200). In addition, the extinguishing fluid may be input by a user's manual operation, and the internal fluid of the extinguishing fluid storage 500 may be automatically introduced by using a sensor for detecting an internal temperature.

The thermal deformation preventing means 600 will be described in detail with reference to FIG. 4.

The heat deformation preventing means 600 may be damaged when fixing the portion supporting the heat deformation of the indirect heat transfer pipe 400 and the dry moving pipe 200, that is, when the length is changed (stretched) according to temperature change. This is to prevent this. More specifically, one side end of the rotation shaft 320 is provided with a heat deformation preventing means (600). Heat deformation preventing means 600 is provided with a bearing 610 for supporting the rotation of the rotary shaft (320). The slider 630 is fastened to the bearing 610 and is moved in the longitudinal direction of the rotating shaft 320 together with the expansion and contraction of the dry moving pipe 200 and the indirect heat transfer pipe 400. A guide shaft 640 for guiding the movement of the slider 630 is provided in the slider 630. Meanwhile, a fixing part 650 for supporting and fixing the guide shaft 640 is provided. That is, the fixing part 650 for fixing the guide shaft 640 on the upper side of the base 680 supports and supports both ends of the guide shaft 640. The length of the guide shaft 640 may take into account the stretch lengths of the indirect heat transfer pipe 400 and the dry moving pipe 200. The guide shaft 640 is inserted into the slider 630, and the support 620 is fixedly supported on the upper side of the slider 630. The bearing 610 for assisting the rotation of the rotating shaft 320 is fixed to the upper side of the support 620.

On the other hand, referring to Figure 4, the heat deformation preventing means 600 is provided with a support 660 which is provided on the outer peripheral surface side of the moving pipe 200 or the indirect heat transfer pipe 400. A roller 670 fastened to the lower side of the support part 660 was provided to cope with the expansion and contraction of the dry moving pipe 200 or the indirect heat transfer pipe 400.

Referring to Figure 5 will be described in detail by the rotary valve 700 provided on the upper side of the dry object inlet 230. The rotary valve 700 is provided with an inlet 710 through which the object is to be inserted into the upper side, a body 720 is provided at the lower portion thereof, and a connection part 730 connected to the object to be inserted into the object 230 is provided at the lower portion of the body 720. It is provided. On the other hand, the inside of the body 720 is provided with a rotating plate 740 having a plurality of wings, the rotating shaft 750 and the driving unit 760 for rotating the rotating plate 740 is provided. The driving unit 760 is rotated by a motor (not shown) provided on one side.

Due to the structure of the rotary valve 760, the dry matter is introduced into a specific region of the rotating plate 740, the rotary shaft 750 and the rotating rotating plate 750 is rotated by a separate drive motor, drying the dry object Put it inside. Minimize the ingress of outside air during the charging process to prevent temperature drop in the dryer.

100: heat source 200: building moving pipe
300: screw 400: indirect heat transfer tube
500: extinguishing fluid storage 600: heat deformation prevention means

Claims (9)

Heat source 100;
The main inlet 210 is provided so that the heat of the heat source 100 is introduced into the inside, the heat source 100 introduced into the main inlet 210 is a passage that is discharged after being utilized as drying heat for drying the dried material. A dry moving pipe (200) having a main outlet (220), a dry product input port (230) into which the dry item is input, and a dry product discharge port (240) discharged after the input dry item is dried; And
Spiral flights (310, 310a) and the flight (310, 310a) is provided in the inside of the dry moving pipe 200 to move the dry object injected from the dry object inlet 230 to the dry object outlet 240 side Screw 300 is connected to the inner end of the rotating shaft (320, 320a) for rotating the flight (310, 310a); Including but not limited to:
The rotating shafts 320 and 320a of the screw 300 are fixed to both end portions of the cylindrical to-be-moved tube 200 and rotated, and the rotation shafts 320 and 320a are the central axes of the to-be-dried tube 200 ( C) is provided spaced downward from the predetermined distance,
The outer circumferential surfaces of the spiral flights 310 and 310a have an elliptical cross-sectional shape when viewed in the axial direction of the rotation shafts 320 and 320a, or the moving pipe 200 has an elliptical cross section when viewed in the axial direction. High-efficiency waste dryer, characterized in that having a.
The method of claim 1,
On the outer circumferential surface of the building moving pipe 200,
In order to transfer the indirect heat to the inside of the dried pipe 200, the outer circumferential surface of the dried pipe 200 is wrapped, the indirect heat inlet 410 through which heat is introduced, and the indirect heat outlet 420 through which the introduced heat is discharged. ) And an indirect heat transfer tube 400 including a partition wall 430 protruding from the outer circumferential surface of the dried pipe 200 to flow in a spiral manner while the heat introduced flows around the outer circumferential surface of the dry pipe 200. High efficiency waste dryer, characterized in that provided.
3. The method according to claim 1 or 2,
One side of the main inlet 210 provided in the dry pipe 200 is extinguished to extinguish the fire of the dry matter dried in the dry pipe 200 by the heat flowing from the heat source 100. The fluid reservoir 500 is further provided, and the extinguishing fluid of the extinguishing fluid reservoir 500 communicates with the main inlet 210 or communicates with a separate inlet provided at one side of the dry pipe 200. High-efficiency waste dryer.
The method of claim 3, wherein
The rotating shaft 320 of the screw 300 is a hollow shaft is provided with a flow path 321 therein, the auxiliary inlet 322 on one side of the rotating shaft 320 is provided with an auxiliary outlet 323, respectively, High-efficiency waste dryer, characterized in that the external air is introduced into the auxiliary inlet 322 is discharged to the auxiliary outlet (323).
The method of claim 4, wherein
An end of the flight 310 provided in the screw 300,
High-efficiency waste dryer, characterized in that the locking jaw (311) protruding by a predetermined length in the longitudinal direction of the rotary shaft 320 is further provided.
3. The method according to claim 1 or 2,
One side end of the rotary shaft 320 is further provided with a thermal deformation preventing means 600,
The heat deformation preventing means 600,
A bearing 610 for supporting the rotation of the rotary shaft 320;
A slider 630 fastened to the bearing 610 and moved together in the longitudinal direction of the rotating shaft 320 along the expansion and contraction of the dry moving pipe 200 and the indirect heat transfer pipe 400;
A guide shaft 640 for guiding the movement of the slider 630; And
High efficiency waste dryer comprising a; fixing portion (650) for supporting and fixing the guide shaft (640).
The method according to claim 6,
The heat deformation preventing means 600,
High-efficiency waste dryer, characterized in that it further comprises a support part 660 provided on the outer peripheral surface side of the dry moving pipe 200 or the indirect heat transfer pipe 400 and a roller 670 fastened to the lower side of the support part 660. .
3. The method according to claim 1 or 2,
A rotary valve 700 is further provided at an upper portion of the dry object inlet 230 to block the inflow of external air when the dry object is input to the dry object inlet 230 to prevent the inflow of external air. High-efficiency waste dryer, characterized in that to prevent falling.
The method of claim 1,
The outer peripheral surface of the rotating shaft 320a of the screw 300 is provided with a frame 315 protruding radially in the circumferential direction, and a spiral flight 310a is connected to the other end of the frame 315, and the rotating shaft 320a High efficiency waste dryer, characterized in that the space portion 316 is formed between the) and the flight (310a).

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