[Background Art] With the industrialization being in progress and population being on the rise, a lot amount of wastes is generated. These wastes can be classified into combustible wastes such as a class of paper, a class of wood, a class of rubber and leather, a class of animal and plant dregs, and a class of sludge, and incombustible wastes such as a class of slag, a class of combustibles, a class of dust, a class of building waste materials, a class of metal and super ceramics, and a class of waste lime and plaster.

Of them, the amount of combustible wastes increase as industry development is in progress. Theses combustible wastes are mainly processed through incineration.

However, as wastes are processed through incineration, air

pollution worsens. More particularly, generation of a large amount of environmental hormone such as dioxin becomes the cause of various cancers. Furthermore, although the demand for an incineration plant for processing wastes increases, foundation of the incineration plant is not easy due to the NIMBY syndrome. Thus, the problem of processing the wastes becomes worse.

[Disclosure] [Technical Problem Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus for manufacturing waste solid fuel and method thereof, wherein the problem of incineration is solved and energy is reproduced by reprocessing wastes into solid fuel.

[Technical Solution To achieve the above object, according to the present invention, there is provided an apparatus for manufacturing waste solid fuel, comprising a waste inflow unit 10 for firstly removing metallic waste from received waste ; a crusher 30 for crushing waste P via the waste inflow unit 10; an underwater separator 40 for secondly removing metallic waste from the waste crushed by the crusher 30 by way of a difference in specific gravity ; a dehydrator 50 for dehydrating the waste from the underwater separator 40 ; a drier 60 for drying the waste from the dehydrator 50; a pulverizer 70 for pulverizing the waste from the drier 60; and a compression and shaping machine 90 for compressing the pulverized waste into solid fuel.

[Description of Drawings FIG. 1 is a view illustrating the construction of an apparatus for manufacturing waste solid fuel according to the present invention; FIG. 2 is an extracted view of a crusher in FIG. 1; FIG. 3 is an extracted view of an underwater separator in FIG.

1; FIG. 4 is an extracted view of a dehydrator in FIG. 1; and FIG. 5 is an extracted view of a drier and a pulverizer in FIG.

1.

[Best Model In the present invention, the crusher 30 comprises a crusher body 31 having a large inlet 31a and a small inlet 31b formed in, a plurality of crusher drums 32,33, 34,35 and 36 disposed within the crusher body 31, for crushing the introduced waste, the crusher drums being sequentially disposed in order of a smaller diameter, and driving units 37 for rotating the crusher drums, wherein the interior of the crusher body 31 has a semi-cylindrical shape, and has a

plurality of crushing vanes 31C formed on, and the crusher drums 32, 33,34, 35 and 36 have a plurality of crusher gears 32a, 33a, 34a, 35a and 36a formed on the outer surfaces of the cylindrical drums, respectively, in a crossing manner.

In the present invention, the underwater separator 40 serves to secondly remove metallic waste from the waste, which is crushed by the crusher 30, and comprises a water tank 41 for containing water, the water tank having an inflow port 41a and an outlet port 41b formed in; transfer drums 43 that rotate within the water tank 41, the transfer drums having a plurality of transfer vanes 43a formed on, a rotary driving units (not shown) for rotating the transfer drums 43; a valve 48 disposed in the outlet port; and a collection container 49 for collecting the metallic waste discharged through the valve 48.

To achieve the above object, according to the present invention, there is provided a method of manufacturing waste solid fuel, comprising the steps of firstly removing metallic waste from conveyed waste; crushing the waste from which the metallic waste is firstly removed; secondly removing metallic waste from the crushed waste by using a difference in specific gravity ; dehydrating the waste from which the metallic waste is removed; drying the dehydrated waste ; pulverizing the dried waste ; and compressing and shaping the pulverized waste, thus producing solid fuel.

[Mode for Invention An apparatus for manufacturing waste solid fuel and method thereof according to the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a view illustrating the construction of an apparatus for manufacturing waste solid fuel according to the present invention.

FIG. 2 is an extracted view of a crusher in FIG. 1. FIG. 3 is an extracted view of an underwater separator in FIG. 1. FIG. 4 is an extracted view of a dehydrator in FIG. 1. FIG. 5 is an extracted view of a drier and a pulverizer in FIG. 1.

Referring to FIGS. 1 to 5, The apparatus for manufacturing the waste solid fuel according to the present invention includes a waste inflow unit 10 for firstly removing metallic waste from received waste, a pressure transfer unit 20 for transferring the waste P via the waste inflow unit 10, a crusher 30 for crushing the waste received from the pressure transfer unit 20 into large dumps, an underwater separator 40 for secondly removing metallic waste from the waste crushed by the crusher 30 by way of a difference in specific gravity, a dehydrator 50 for dehydrating the waste from the underwater separator 40, a drier 60 for drying the waste from the dehydrator 50, a pulverizer 70 for pulverizing the waste from the drier 60 into small dumps, a silo 80 for storing the waste pulverized in the pulverizer 70, and a compression and shaping machine 90 for compressing the waste received

from the silo 80 into solid fuel. The waste, which is compressed and shaped in the compression and shaping machine 90, becomes the solid fuel. The solid fuel is transferred to the outside through a mesh conveyer 95.

The waste P is loaded at a given location. The loaded waste P is introduced into the waste inflow unit 10 by means of a first transfer conveyer C1.

The waste inflow unit 10 is for firstly removing metallic waste (incombustibles) of large dumps from the collected waste. The waste inflow unit 10 has a magnet conveyer 15 installed at the top of a second conveyer C2. An electromagnet is disposed within the magnet conveyer 15, and serves to selectively separate the metallic waste from the waste that is conveyed by means of the transfer conveyer C.

This magnet conveyer 15 is well known in the art, and further description on it will be thus omitted.

The pressure transfer unit 20 is for forcibly transferring the waste from the magnet conveyer 15 to the inlet of the crusher 30. It has a pressure plate 22, which is moved front and rear by means of an oil pressure cylinder 21. In this time, a curved face 22a is formed in front of the pressure plate 22, and serves to forcibly transfer the waste in an effective way.

The crusher 30 includes a crusher body 31 in which a large inlet 31a and a small inlet 31b are formed, a plurality of crusher drums 32,

33,34, 35 and 36 disposed within the crusher body 31, for crushing the introduced waste, and driving units 37 for rotating the crusher drums. In this time, the crusher drums are sequentially disposed in order of a smaller diameter.

The interior of the crusher body 31 has a semi-cylindrical shape, and has a plurality of crushing vanes 31C formed on. The crusher drums 32,33, 34,35 and 36 have a plurality of crusher gears 32a, 33a, 34a, 35a and 36a formed on the outer surfaces of the cylindrical drums, respectively, in a crossing manner. Crushing spaces are formed between the tops of the crusher drums and the crusher body 31. It is preferred that the crushing spaces are sequentially narrowed. This makes the crushing pressure weighted by the crusher gears and the crushing vanes, and also facilitates the transfer of the waste. Each of the driving units 37 consists of a motor and a decelerator, and is thus connected to the crusher drum in an organic manner. For example, a pulley can be installed in the shaft of the motor and the decelerator, and the pulley can be connected to a belt. The construction of the driving units 37 is a conventional one. Further description on it will be thus omitted.

The waste crushed by the crusher 30 is conveyed to the underwater separator 40 by means of a third transfer conveyer C3. In this time, the third transfer conveyer C3 can be a conveyer of a screw type.

The underwater separator 40 serves to secondly remove the metallic waste from the waste, which is crushed by the crusher 30, by way of specific gravity. The underwater separator 40 includes a water tank 41 for containing water, the water tank having an inflow port 41a and an outlet port 41b formed in, transfer drums 43 that rotate within the water tank 41, the transfer drums having a plurality of transfer vanes 43a formed on, a rotary driving units (not shown) for rotating the transfer drums 43, a valve 48 disposed in the outlet port, and a collection container 49 for collecting the metallic waste discharged through the valve 48. In this time, the transfer vanes 43a preferably has nets formed in.

The water tank 41 has a structure in which the inflow port 41a is wide and the outlet port 41b is tapered. The driving units are substantially the same as the driving units 37 described in the crusher body 31. Detailed description on them will be thus omitted.

In the underwater separator 40, if the transfer drums 43 rotate, the surface of water laps. Heavy metallic waste subsides, and light plastic, wood, etc. rise to the surface of water, due to a difference in specific gravity of water. In this time, since water passes through the net, only floated light wastes are conveyed to the dehydrator 50.

Meanwhile, if a large amount of the metallic wastes is accumulated on the water tank 41, the valve 48 is opened so that the

metallic wastes are collected in the collection container 49. If a sufficient amount of the metallic wastes is accumulated, they are discharged toward the outside.

The waste from which the metallic waste is secondly removed in the underwater separator 40 is conveyed to the dehydrator 50 by means of a fourth transfer conveyer C4. In this time, the fourth transfer conveyer C4 is a conveyer of a screw type.

The dehydrator 50 serves to firstly remove moisture from the waste from the underwater separator 40. The dehydrator 50 includes a housing 51 having a cylindrical shape, wherein the housing 51 has a drop port 51a formed at one upper side and an outlet port 51b formed at the other lower side, a screw 53 disposed within the housing 51, and a driving unit 57 for rotating the screw 53. In this time, the driving unit 57 is similar as that used in the crusher or the underwater separator. Through this structure, the waste introduced into the drop port 51a is compressed and conveyed to the outlet port 51b by means of the screw 53. Moisture contained in the waste is removed during the compressed convey process. The removed moisture is discharged toward the outside through a duct 54 disposed near the outlet port.

The waste from which moisture is removed in the dehydrator 50 is conveyed to the drier 60 by means of a fifth transfer conveyer C5. In this time, the sixth transfer conveyer C5 can be a conveyer of a screw

type.

The drier 60 serves to secondly remove moisture from the waste from the dehydrator 50. The drier 60 includes a housing 61 having a cylindrical shape, wherein the housing 61 has a drop port 61a formed at one upper side and an outlet port 61b formed at the other lower side, a rotary support unit 62 for rotatably supporting both sides of the housing 61, a cooling material 63 coated on the inner circumference of the housing 61, spiral guide vanes 64 projected from the inner circumference of the cooling material 63 in a spiral direction, a hot air machine 65 for supplying hot air into the housing 61, and a driving unit 67a, 67b, 67c for rotating the housing 61.

The driving unit 67a, 67b, 67c can be implemented in a variety of shapes. For example, the driving unit can have a structure for rotating the whole housing 61. The driving unit 67a, 67b, 67c can include a housing gear 67a formed on an outer circumference of the housing 61, a deceleration gear 67b engaged with the housing gear 67a at the bottom of the housing 61, and a motor 67c for rotating the deceleration gear 67b. Accordingly, if the deceleration gear 67b is rotated by the motor 67c, the housing 61 is rotated with it being supported by the rotary support unit 62.

Through this structure, if the waste hydrated through the drop port 61a is slowly introduced in a state where the driving unit 67a, 67b, 67c slowly rotates the housing 61 and the hot air machine 65

flows hot air into the housing 61, the waste is slowly moved toward the outlet port 61b through the spiral guide vanes 64 while being turned over several times. Through this process, hot air removes moisture within the waste, thus drying the waste.

The pulverizer 70 serves to pulverize the waste, which has passed through the drier 60, into a powder shape. It includes a housing 71 having a drop port 71a of a hopper type disposed at the top and an outlet port 71b disposed at a lower side, a pulverizing gear 73 disposed within the housing 71, and a driving unit 77 for rotating the pulverizing gear 73. In this time, the driving unit 77 is similar as that used in the crusher 30 or the underwater separator 40. Further description on it will be thus omitted.

Through this structure, the waste dried through the drop port 71a is pulverized into a power shape by means of the pulverizing gear 73, and is then discharged through the outlet port 71b.

The silo 80 temporarily stores powder waster, which is pulverized by the pulverizer 70. This silo 80 can include a conventional one.

The waste stored in the silo 80 is conveyed to the compression and shaping machine 90 by means of a sixth transfer conveyer C6. The sixth transfer conveyer C6 can be a conveyer of a screw type.

The compression and shaping machine 90 compresses the powder waste stored in the silo 80 into solid fuel of a given shape. This

compression and shaping machine 90 can be implemented into various shapes. For example, the compression and shaping machine 90 can have a structure in which a compression screw is installed within the housing, or a structure in which the powder waste is compressed by a piston driven by the oil pressure cylinder. This compression and shaping machine 90 can have a variety of shapes depending upon the shape or size of solid fuel to be fabricated.

A method of manufacturing solid fuel using the apparatus constructed above will now be described.

First, metallic waste is firstly removed from waste conveyed to the waste inflow unit 10. This step is performed by the magnet conveyer 15 of the waste inflow unit 10.

Next, the waste from which the metallic waste is firstly removed is forcedly transferred to the crusher 30. This step is performed by the pressure transfer unit 20.

The transferred waste is then crushed into dumps of a relatively large size. This step is performed by the crusher 30.

Metallic waste is secondly removed from the crushed waste by ways of a difference in specific gravity. This step is performed by the underwater separator 40.

The waste from which the metallic waste is secondly removed is dehydrated. This step is performed by the dehydrator 50.

Next, the dehydrated waste is dried. This step is performed by

the drier 60.

The dried waste is pulverized. This step is performed by the pulverizer 70.

The pulverized waste is conveyed to the silo 80 for temporary storage.

Thereafter, the waste conveyed from the silo 80 is compressed and shaped into solid fuel. This step is performed by the compression and shaping machine 90.

While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.

[Industrial Applicabilityl As described above, according to an apparatus for manufacturing waste solid fuel and method of manufacturing solid fuel in accordance with the present invention, solid fuel is reprocessed from waste.

Accordingly, there are effects in that the problem of incineration can be solved, and solid fuel that can reproduce energy can be effectively reproduced.