JPH10339418A - Waste treating equipment nd waste processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste treating method of improving heat efficiency. SOLUTION: The present waste treating method is adapted such that low calorie waste B in waste A divided to the low calorie waste B and high calorie waste C is supplied to an incinerator 13 for burning and ash produced in the incinerator 13 is supplied to a melting furnace for heating and melting and thereupon combustible fractures E that are obtained by crushing combustible matter in the high calorie waste C is sorted to rough combustible matter F and fine combustible matter G, and the rough combustible matter F is supplied to the incinerator 13 as a secondary fuel and the fine combustible matter G is supplied to a heating burner 22 as a fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment facility, and more particularly to a facility having an incineration facility for incinerating waste and a melting facility for melting ash generated by the incineration.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, an incineration facility 101 for incinerating waste A and a melting facility 102 for melting ash discharged from the incineration facility 101 are shown in FIG. Some have.

[0003] The incineration facility 101 includes a waste pit 111 for storing low-calorie waste (eg, garbage) B and high-calorie waste (eg, plastics, paper, and wood) C, An incinerator 112 for incinerating the waste A supplied from the waste pit 111, and an ash cooling device 11 for cooling ash generated in the incinerator 112 with water
3 and an ash pit 114 for storing the ash taken out from the ash cooling device 113.

In the melting facility 102, a melting furnace 122 for heating and melting the ash supplied from the ash pit 114 with a heating burner 121, and the molten ash melted in the melting furnace 122 with water (or air). A slag cooling device 123 for cooling and solidifying is provided.

[0005] In order to recover the metal from the slag taken out of the ash melting facility 102, a metal recovery facility having a magnetic separator 132 for recovering the metal, ie, iron, from the slag on the conveyor 131 for carrying out the slag. 13
3 are provided.

[0006] In the above waste treatment facility, the waste A in the waste pit 111 is put into the incinerator 112 from the input hopper and burned, and the incinerated ash is
The ash is stored in the ash pit 114 via the ash cooling device 113.

The ash stored in the ash pit 114 is supplied to a melting furnace 122, where it is heated and melted by a heating burner 121, solidified by a slag cooling device 123, and then recovered with a metal. Iron is collected at the facility 133, and the rest is taken out as slag and reused.

[0008]

According to the configuration of the above-mentioned conventional waste treatment equipment, high-calorie waste C is also required.
Although it is burned in the incinerator 112, there is a problem that it is difficult to burn high calorie waste C. In the incineration facility, heat is recovered by a boiler, etc. All of the heat relies on external energy, and thus wastes heat efficiently.

Accordingly, an object of the present invention is to provide a waste treatment facility and a waste treatment method that can improve the thermal efficiency.

[0010]

Means for Solving the Problems In order to solve the above problems, a waste treatment facility of the present invention has an incinerator for incinerating waste and a melting furnace for melting ash discharged from the incinerator, In a waste treatment facility that cools and solidifies the molten ash discharged from this melting furnace, a primary crusher that crushes high-calorie waste among the sorted waste, and a high-calorie crush that is crushed by this primary crusher A sorter for sorting materials into combustibles and incombustibles, a secondary crusher for further crushing the combustibles sorted by the separator, and a combustible crushed product crushed by the secondary crusher to a predetermined size. And a separating device that separates the flammable materials separated by the separating device as a secondary fuel of the incinerator and heats the flammable materials provided in the melting furnace. Burner's It is those configured to provide a fee, and in the waste treatment facility, is provided with a dryer inlet side or the outlet side to a waste of the primary crusher.

[0011] Further, the waste disposal method of the present invention provides a low calorie waste among wastes separated into a low calorie waste and a high calorie waste to an incinerator for incineration, When the ash generated in the furnace is supplied to the melting furnace and the ash is heated and melted, the flammable crushed material obtained by crushing the combustible material among the high calorie wastes above And a method for supplying the coarse combustibles to the incinerator as a secondary fuel, and supplying the fine combustibles to the heating burner of the melting furnace as fuel.
Further, in the above-mentioned waste treatment method, the method is a method in which high calorie waste is dried before or after being crushed.

Further, another waste treatment facility and a waste treatment method according to the present invention are the above-mentioned treatment facility and treatment method, wherein coarse combustible material is supplied to an incinerator and fine combustible material is supplied. Is supplied as secondary fuel for the incinerator and supplied to the heating burner of the melting furnace as fuel.

According to each of the above-mentioned waste treatment apparatuses and waste treatment methods, high-calorie waste such as plastic, paper, and wood is divided into small pieces, and the small pieces are separated into at least a melting furnace. To use the fuel as fuel, so that the waste can be effectively used.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a waste treatment facility and a waste treatment method according to a first embodiment of the present invention will be described with reference to FIG.
A description will be given with reference to FIG.

First, a waste treatment facility will be described.
This waste treatment facility is roughly divided into an incineration facility 1 for mainly incinerating low-calorie waste B among wastes A separately collected into low-calorie waste B and high-calorie waste C. A melting facility 2 for heating and melting the ash generated in the incineration facility 1; and a fragmentation facility 3 for crushing the high-calorie waste C into fragments (also referred to as fluffing) out of the waste. It is configured.

In the incineration facility 1, waste A is divided into low-calorie waste (for example, general waste such as garbage) B and high-calorie waste (plastics, paper, wood, etc.).
C, and the low-calorie waste B supplied through the charging hopper 12.
And an incinerator 13 for burning.

At the inlet of the charging hopper 12, a crushing supply machine 14 (which may have only a crushing machine) for crushing and supplying the waste to be charged is arranged. At the same time, a pushing device (not shown, for example, a pusher device) for pushing waste from the charging hopper 12 into the incinerator 13 is provided at an outlet portion of the charging hopper 12, that is, at a waste supply point of the incinerator 13. Is disposed, and a boiler 15 is disposed in a flue portion 13 a in the incinerator 13.

The melting facility 2 has an ash supply passage 21 connected to the ash extraction passage 16 on the incinerator 13 side and a melting furnace 23 having a ash heating burner 22, and the melting furnace 23 melts in the melting furnace 23. A slag cooling device 24 that guides molten ash (molten slag) D from its outlet 23a and solidifies with water or air.

The exhaust gas from the melting furnace 23 is sent to an exhaust gas treatment device after heat recovery in a heat recovery section 25, and a part of the exhaust gas is supplied to a secondary combustion zone in the incinerator 13. It is configured to be.

Further, this waste treatment facility is provided with a metal recovery facility 4 for sorting metal pieces in the slag taken out from the slag cooling device 24 of the melting facility 2 as in the prior art.

Further, the fragmentation facility 3 has a transport path 5 for transporting the waste in the waste pit 11 to the incinerator 13 side.
, A dryer 32 for drying the high-calorie waste C taken out from the hopper 31, and a high-calorie waste C dried by the dryer 32. (For example, a twin-screw crusher is used) 33, and the high-calorie crushed material crushed by the primary crusher 33
A wind separator (also referred to as a gravity separator) 35 for guiding light crushed materials (combustible materials) and heavy crushed materials (non-combustible materials) by the wind and guided by the wind 4, and the conveyor 34.
And a wind separator 35 disposed in the middle of the
And a slicing device (also referred to as a slicing device or fluffing device) 37 for further reducing the light crushed material, that is, the combustible material, which is selected in the above.

The dryer 32 is supplied with exhaust gas from the incinerator 13 as a heat source through an exhaust gas introduction pipe 38 to directly heat the high-calorie waste C. The exhaust gas used for drying in the inside is guided to a high-temperature combustion zone in the incinerator 13 through an exhaust gas outlet pipe 39, and the odor is decomposed.

As shown in FIG.
The combustible crushed material E supplied from the wind separator 35 is further
Secondary crusher (eg, cutter mill)
Are used by the secondary crusher 41.
The combustible crushed material E having a predetermined size, for example,
Height 25mm^Two (5mm x 5mm) or more and 25mm^Two
Strip sorter (for example, vibrating sieve)
Machine is used) and 42)
25 mm obtained by this strip sorter 42^Two Above shards possible
The fuel F is transferred from the incinerator 13 via the first transfer path 51 to the secondary fuel.
It is configured to supply the burned part as secondary fuel, and
25 mm obtained by the strip separator 42^Two Less than flammable particles
G is provided in the melting furnace 23 via the second transfer path 52.
So that the fuel is supplied to the heated burner 22.
Further, a part of the coarse piece combustibles F passes through the circulation path 53.
So that it is returned to the secondary crusher 41 and crushed again.
Is configured.

Therefore, in the above-mentioned waste treatment facility, the low-calorie waste B among the waste A separately collected in the waste pit 11 is transported to the input hopper 12 by a crane or the like, where it is crushed. The powder is crushed by the feeder 14 and supplied to the incinerator 13 via the charging hopper 12 for incineration.

The incineration ash generated in the incinerator 13 is supplied to a melting furnace 23, where it is heated and melted by a heating burner 22. By the way, the high-calorie waste C in the waste pit 11 is also supplied to the dryer 32 from the removal hopper 31 by the crane and dried by the exhaust gas of 500 to 550 ° C. discharged from the incinerator 13. The dried high-calorie waste C is supplied to a primary crusher 33, where the primary crush is performed, and iron is collected by a magnetic separator 36. High calorie combustible crushed materials such as pieces, paper pieces, and wood are sorted, and the high calorie flammable crushed materials are supplied to the fragmentation device 37. The dryer 32
Exhaust gas (about 150 ° C.) is guided to the high-temperature combustion zone of the incinerator 13 by the exhaust gas discharge pipe 39 to decompose odor.

Then, in the fragmenting device 37, the crushable material F having a size of 25 mm ² or more is further crushed by the secondary crusher 41 and supplied to the incinerator 13 as secondary fuel, Less than ^two strip combustibles G are supplied to the heating burner 22 as fuel.

As described above, of the waste A, combustible and high-calorie waste C such as plastic, paper, and wood is converted into:
Since the flammable material obtained by crushing into pieces having a size of about 25 mm ² is supplied to the incinerator 13 and the melting furnace 23 to be used as fuel, effective use of waste can be achieved. Highly efficient waste treatment equipment can be obtained.

Further, since the high-calorie waste C is dried by the dryer 32 before the primary crushing, a high-calorie, high-quality fluff fuel can be obtained, and the low-calorie waste B is converted into a high-calorie waste. Even when mixed into the object C, the low-calorie waste B is dried, so that it can be used as a fluff fuel.

Furthermore, in the incinerator 13, Arahen combustibles are supplied to the secondary combustion part, by adjusting the secondary combustion air, it is possible to perform the low air ratio combustion, thus NO _X And CO can be reduced at the same time, so that generation of dioxin can be suppressed.

In the above embodiment, the exhaust gas of the incinerator 13 was used as the heat source of the dryer 32. For example, the steam (for example, 400
° C) (in this case, the steam is indirectly heated via a heat transfer tube), or a separate hot air generator may be provided to guide hot air therefrom.
Of course, also in this case, the exhaust gas from the dryer 32 is guided to the high-temperature combustion zone in the incinerator 13.

Next, a waste treatment facility and treatment method according to a second embodiment of the present invention will be described with reference to FIG. In the description, the same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the above-described first embodiment, the coarse combustible material F is supplied as a secondary fuel into the incinerator 13, but the processing equipment and the processing method according to the second embodiment are used. In this method, the coarse combustibles F are returned to the waste pit 11 and then supplied to the incinerator 13, and the small combustibles G are used as the secondary fuel of the incinerator 13. The fuel is supplied to the heating burner 22 of the melting furnace 23 as fuel.

That is, as shown in FIG. 3, the coarse combustibles F from the small-piece separator 42 are transferred to the waste pit 11 via the return transfer pipe 61 connected in the middle of the circulation transfer pipe 53. On the other hand, the strip combustibles G are supplied as secondary fuel to the incinerator 13 via the first transfer pipe 51,
The fuel is supplied to the heating burner 22 of the melting furnace 23 through the second transfer pipe 52 as fuel. Of course, in this case, the first transfer pipe 5
One end of the first and second transfer pipes 52 is connected to an outlet of the strip sorter 42.

In some cases, the coarse combustibles F from the fine-piece separator 42 may be directly transferred to the charging hopper 12 and supplied into the incinerator 13. By the way, in each of the above embodiments, the dryer is provided on the inlet side of the primary crusher, but, for example, for a plastic bag, it is better to crush first, in such a case, The dryer is provided on the outlet side of the primary crusher.

[0035]

As described above, according to the waste treatment apparatus and the waste treatment method of the present invention, high-calorie waste such as waste plastic, paper, wood and the like among the wastes is fragmented, and this fragmentation is performed. The waste thus obtained is supplied to at least the melting furnace and used as fuel, so that the waste can be effectively used, and a highly efficient waste treatment facility can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a waste treatment facility according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a fragmentation device in the waste treatment facility.

FIG. 3 is a diagram illustrating a schematic configuration of a fragmentation device of a waste treatment facility according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a schematic configuration of a conventional waste treatment facility.

[Explanation of symbols]

 A waste B low calorie waste C high calorie waste 1 incineration facility 2 melting facility 3 fragmentation facility 11 waste pit 13 incinerator 22 heating burner 23 melting furnace 31 removal hopper 32 dryer 33 primary crusher 35 wind power Sorter 37 Shredding device 41 Secondary crusher 42 Sorter 51 First transfer pipe 52 Second transfer pipe 61 Transfer pipe for return

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Onishi 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Japan Inside Hitachi Zosen Corporation (72) Inventor Kozo Kitakaku 5-chome, Nishikujo, Konohana-ku, Osaka-shi, Osaka No. 3 28 Inside Hitachi Zosen Corporation

Claims (8)

[Claims] An incinerator for incinerating waste, a melting furnace for melting ash discharged from the incinerator, and a waste treatment facility for cooling and solidifying the molten ash discharged from the melting furnace. Primary crusher that crushes high-calorie waste, crusher that crushes high-calorie crushed material by this primary crusher into combustibles and non-combustibles, and this sorter A secondary crusher for further crushing the combustible material that has been provided, and a separator for separating the combustible crushed material crushed by the secondary crusher by a predetermined size are provided, and separated by the separator. A waste treatment facility, characterized in that flammable flammable material is supplied as secondary fuel of the incinerator and flake combustible material is supplied as fuel of a heating burner provided in the melting furnace. 2. A drying machine for drying wastes is provided at an inlet side or an outlet side of the primary crusher.
Waste treatment equipment as described. 3. The low-calorie waste and the low-calorie waste are separated into low-calorie waste and supplied to an incinerator for incineration, and the ash generated in the incinerator is melted in a melting furnace. When the ash is heated and melted by heating, the combustible crushed material obtained by crushing the combustibles among the high calorie wastes is separated into coarse combustibles and small combustibles. A waste disposal method comprising supplying combustibles as secondary fuel to the incinerator and supplying the combustible strips as fuel to a heating burner of the melting furnace. 4. The waste treatment method according to claim 3, wherein the high calorie waste is dried before or after the high calorie waste is crushed. 5. A waste treatment facility having an incinerator for incinerating waste and a melting furnace for melting ash discharged from the incinerator and cooling and solidifying the molten ash discharged from the melting furnace. Primary crusher that crushes high-calorie waste, crusher that crushes high-calorie crushed material by this primary crusher into combustibles and non-combustibles, and this sorter A secondary crusher for further crushing the combustible material thus obtained, and a separator for separating the combustible crushed material crushed by the secondary crusher into a predetermined size, and separated by the separator. The coarse combustible is supplied to the incinerator, and the small combustible separated by the separator is supplied as the secondary fuel of the incinerator and the fuel of the heating burner provided in the melting furnace. Configured Waste processing equipment characterized by. 6. A dryer for drying wastes is provided at an inlet or an outlet of the primary crusher.
Waste treatment equipment as described. 7. A low calorie waste is separated into a low calorie waste and a high calorie waste, the low calorie waste is supplied to an incinerator for incineration, and the ash generated in the incinerator is melted. When the ash is heated and melted by supplying to the ash, the combustible crushed material obtained by crushing the combustibles among the high calorie wastes is separated into coarse combustibles and small combustibles. A waste disposal method comprising: supplying combustibles to the incinerator; and supplying the combustible strips as secondary fuel to the incinerator and supplying fuel to a heating burner of the melting furnace. 8. The waste disposal method according to claim 7, wherein the high calorie waste is dried before or after crushing.