JPH10148321A - Melting-disposing device for incineration ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently melt incineration ash, make the incineration ash harmless, and reduce the volume of the incineration ash. SOLUTION: This device is equipped with a melting furnace 1 which melts incineration ash H by using coke C and waste plastics as a fuel. The melting furnace 1 is equipped with a coke combustion unit 5 which burns the coke C, an incineration ash-melting unit 6 which melts the incineration ash H, and a waste gas combustion unit 7 which burns CO. Waste plastics are blown in together with hot air, at this side of the tuyere 37, by a waste plastic feeding means 40 into an air passage 10 which feeds hot air to the coke combustion unit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an incineration ash melting apparatus.

[0002]

2. Description of the Related Art Generally, ash (incinerated ash) discharged from a garbage incinerator or the like has been disposed of in a landfill. Further, when molding various plastic products, a large amount of waste material (waste plastic) is generated in addition to the products at the time of molding.

[0003]

However, ash sometimes contains harmful substances. In such a case, the ash cannot be disposed of in a landfill or the like, and the ash is generally bulky. It was troublesome. Further, it is necessary to separately incinerate waste plastic with a plastic incinerator or the like, and disposal of this waste plastic is troublesome.

[0004] Therefore, according to the present invention, it is possible to detoxify and reduce the volume of incinerated ash and to perform continuous tapping.
Moreover, it is an object of the present invention to provide an incineration ash melting apparatus capable of effectively using waste plastic.

[0005]

In order to achieve the above-mentioned object, an apparatus for melting incinerated ash according to the present invention is provided at a lower coke burning section for burning coke and above the coke burning section. An incineration ash melting treatment apparatus comprising: a melting furnace having an incineration ash melting section for melting incineration ash and an ash gas combustion section provided above the incineration ash melting section for burning CO; Waste plastic supply means for blowing powdery waste plastic together with the hot air into the blowing path for supplying hot air to the part before the tuyere and burning it together with coke to melt the incinerated ash of the incinerated ash melting part, It is provided.

At this time, the powdery waste plastic is supplied to a wind box disposed along the outer periphery of the melting furnace, but the wind box and the coke combustion section are disposed along the outer periphery of the melting furnace. The powdery waste plastic may be supplied to the tuyere conduit communicating with the hot air, and the temperature of the hot air supplied to the coke combustion section is preferably set to 350 ° C to 450 ° C.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show an incineration ash melting apparatus according to the present invention. The melting apparatus includes a melting furnace 1 and uses coke C and waste plastic (RPF) P (see FIG. 3) as fuel. The incineration ash H is melted to make the incineration ash H harmless and its volume is reduced. Waste plastic P
Is generated during molding of various plastics, and incinerated ash H is discharged from a garbage incinerator or the like. In addition, when this melt processing apparatus is used, the incinerated ash H is made into a substantially oval spherical small lump, and the waste plastic P is made into a powder form.

Thus, the melting furnace 1 of the melting processing apparatus comprises: a cylindrical furnace main body 2 whose lower end portion is sequentially reduced in diameter; a furnace floor 3 having a lower opening of the cylindrical furnace main body 2 as a cover; A charging cylinder 4 that is connected to the upper opening of the furnace body 2.
That is, the lower end of the cylindrical furnace body 2 is a coke burning section 5 into which coke C is charged, and an upper portion thereof is an incinerated ash melting section into which incinerated ash compacted into a substantially elliptical sphere is charged. The upper part is an exhaust gas combustion part 7 for reburning the exhaust gas CO.

That is, a first air passage 10 to which hot air is supplied is connected to the coke combustion section 5 and is connected to the incineration ash melting section 6.
Is connected to a second air passage 11 to which hot air is supplied, and the exhaust gas combustion unit 7 is connected to a third air passage 12 to which hot air is supplied. By the way, each air passage 10,1
Numerals 1 and 12 denote wind boxes 13, 14 and 15 disposed along the outer periphery of the furnace main body 2, and tuyere conduits 16 and 14 connecting the wind boxes 13, 14 and 15 to the furnace main body 2, respectively. 35, 36, and each air passage 10,
Hot air is supplied to 11 and 12 from a hot air supply source (not shown). The hot air supply source includes, for example, a combustion chamber for burning exhaust gas, and a heat exchanger for exchanging cold air for hot air with heat of high temperature exhaust gas from the combustion chamber.

Thus, the opening in the coke combustion section 5 of the air passage 10, that is, the tuyere 37, is disposed near the inclined surface 17 of the hearth 3 having the inclined surface 17. In the hearth 3, a hole 18 having a bottom surface having the inclined surface 17 is formed, and a slag port 19 is opened at a lower end side of the inclined surface 17.

In this case, a plurality of hearths 3 (in the illustrated example, 2
), And each hearth 3 is slidable via slide means (not shown) so that switching is possible. The slide means includes, for example, a guide rail, wheels running on the guide rail, a drive mechanism for rotating the wheels, and the like. Therefore, when the slag port 19 of one hearth 3 is clogged, it can be switched to another hearth 3,
Maintenance is extremely easy.

A connecting pipe section 20 connected to a communication pipe 23 (see FIG. 2) connected to the combustion chamber is formed at an upper portion of the furnace main body 2. In addition, a refractory material 21 is coated on the inner surfaces of the connecting pipe portion 20 to the furnace main body 2. And
On the outer peripheral side of the coke combustion section 5, a water cooling jacket section 22 is formed.

The coke combustion section 5 has a taper angle θ of 10 ° to 20 °, and a maximum sectional area (a sectional area of the incineration ash melting section 6 and the exhaust gas burning section 7) and a minimum sectional area thereof. The ratio is (2: 1) to (4: 1).
That is, by setting the coke combustion unit 5 in this way, as described later, it is possible to effectively prevent the dissipation of the dissipated heat and to maintain an appropriate amount of coke.

Further, the melting treatment apparatus includes a waste plastic supply means 40 for supplying powdery waste plastic P to the coke combustion unit 5. As shown in FIG. 3, the waste plastic supply means 40 includes a storage tank 41 for storing the powdery waste plastic P, and a powdery waste plastic P in the storage tank 41 via a transfer air path 42. And a cyclone 43 supplied. The storage tank 41
A valve 39 is provided in the lower opening of the container, and powdered waste plastic P is supplied to the conveying air path 42 via the valve 39. The particle size of the waste plastic P is, for example, about 2 mm to about 10 mm.

In this case, the cyclone 43 is connected to the tuyere conduit 16 through a valve 44 and a pipe 45. That is, in this embodiment, six tuyere conduits 16 are arranged at a predetermined pitch (specifically, 60 ° pitch) along the circumferential direction, and of these six, for example, three cyclones 43 are provided. valve
They are connected to each other through 44 and a pipe 45. That is, a plurality of (in this case, three) branch pipes 46 are provided in the transport air path 42.
Are provided, and the branch pipe 46 is connected to each cyclone 43 in communication. The transfer air path 42 is connected to an air source (not shown). As the valves 39 and 44, for example, rotary valves are used, but of course, various other valves can be used.

Accordingly, the powdery waste plastic P in the storage tank 41 is transferred to the cyclone together with the transport air in the transport air path 42.
43, from the cyclone 43 to a tuyere conduit 16 via a pipe 45, and from the tuyere conduit 16 to the tuyere conduit 16
Is supplied to the coke burning part 5 of the melting furnace 1 together with the hot air supplied to the furnace.

As described above, the first air passage 10 supplies hot air for burning the coke C and the waste plastic P to the coke combustion section 5, and the second air passage 11 preheats the incineration ash H. And the third air passage 12 supplies hot air for burning CO (exhaust gas).

Next, the charging cylinder 4 has an insertion portion 24 inserted into the upper opening of the furnace body 2 and a charging portion 26 into which the incineration ash H is charged from the charging bucket 25. 26, a damper 27 is provided. The damper 27 includes a cone portion 28,
A vertical holding rod 29 for holding the cone portion 28, a horizontal holding rod 30 for holding the vertical holding rod 29, and cylinders 31 and 31 attached to the outer surface of the loading section 26 for vertically moving the horizontal holding rod 30; Is provided.

Therefore, the piston rod 31a of the cylinder 31
In the cone section 28 in the contracted state, the input port 32 of the input section 26
Is in the form of a cover, and the charging port 32 is opened with the piston rod 31a extended. The input bucket 25 is a fulcrum.
When the insertion port 34 is inserted into the insertion cylinder 4 so as to turn downward as shown by the phantom line in FIG. The incineration ash H is introduced into the charging cylinder 4 and supplied from the charging cylinder 4 into the furnace body 2.

Next, a melting process for melting the incineration ash H using the incineration ash H melting apparatus will be described. First, coke C is charged into the melting furnace 1 through the charging bucket 25 and supplied to the coke combustion section 5. Thereafter, the small incinerated ash H is charged into the melting furnace 1 through the charging bucket 25 and supplied to the incinerated ash melting section 6.

Then, hot air is blown from each of the air passages 10, 11 and 12 into a coke combustion section 5, an incineration ash melting section 6, and an exhaust gas combustion section 7, respectively.
To supply. At this time, the waste plastic P is supplied from the waste plastic supply means 40 to the coke combustion unit 5. That is, the powdery waste plastic P is supplied to the tuyere conduit 16, and the waste plastic P is supplied to the coke combustion unit 5 together with the hot air. Thus, the coke C and the waste plastic P in the coke combustion section 5 are burned, the incineration ash H in the incineration ash fusion section 6 is melted, and CO (exhaust gas) in the exhaust gas combustion section 7 is reburned. At this time, the temperature of the supplied hot air is set at about 350 ° C. to 450 ° C., and the upper part of the coke combustion part 5 or its vicinity is set at about 1300 ° C. to about 2000 ° C.

Exhaust gas in the furnace 1 is supplied (sucked) to a combustion chamber (not shown) through a connecting pipe 20 as shown by an arrow. At this time, the ascending gas velocity in the melting furnace 1, that is, in the exhaust gas combustion section 7 is set to 2.0 m / s or more and 4.8 m / s or less, particularly preferably 3.0 m / s or more and 3.5 m / s or less. . That is, if the in-furnace rising gas velocity is lower than 2.0 m / s, it is difficult to suck the exhaust gas into the combustion chamber. Is sucked into the combustion chamber. That is, if the speed is limited to the above range, the yield of the incinerated ash H can be improved. In particular,
The yield can be about 95%.

The exhaust gas sucked into the combustion chamber is heated again in the combustion chamber, whereby the exhaust gas is rendered harmless, and the heat of the exhaust gas is exchanged for hot air in a heat exchanger. , 11,12.

The molten slag is supplied to the slag port 19 of the hearth 3.
Is discharged to the outside. The coke C and the incineration ash H are sequentially charged (replenished) into the melting furnace 1 from the charging bucket 25, and the waste plastic P is supplied to the waste plastic supply means.
The incineration ash H is supplied to the coke combustion section 5 from 40 and can be efficiently melted. In this case, the melting temperature of the slag can be increased by increasing the surface temperature of the coke C, so that the molten slag flows easily, and the molten slag flows out easily.

In the melting furnace 1, since the cross-sectional area of the coke burning section 5 is gradually reduced toward the lower end, the heat dissipation from the coke burning section 5 is reduced to reduce the heat efficiency. Improvement can be achieved. Further, since the hearth 3 can be switched, maintenance is easy, and further, since the inner surface of the hearth 3 is the inclined surface 17, the molten slag can be continuously discharged outside the furnace.

By the way, the waste plastic P is supplied to the air passage 10
The tuyere is supplied before the tuyere 37, and in the illustrated example, is supplied to the tuyere conduit 16, as shown in FIG.
It may be supplied to the wind box 13. That is, the pipe 45 of the waste plastic supply means 40 may be directly connected to the wind box 13 to supply the powdery waste plastic P from the pipe 45. The number of tuyere conduits 16, 35, and 36 in the melting furnace 1 can be freely increased and decreased, and the number of waste plastic supply means 40 connected to and connected to the tuyere conduit 16 can be freely increased and decreased.

[0028]

Since the present invention is configured as described above,
The following effects are obtained. According to the incineration ash melting apparatus according to claim 1, the incineration ash H is produced by using coke C and waste plastic P as fuel.
Can be efficiently melted, and the incineration ash H can be rendered harmless and reduced in volume. In particular, the combustion temperature of the coke combustion unit 5 can be increased without increasing the height of the coke C in the coke combustion unit 5. Further, since the waste plastic P is supplied together with the hot air supplied to the coke combustion section 5, the waste plastic P can be reliably supplied, and the waste plastic supply means 40 can be easily attached to the existing melting furnace. can do. According to the incineration ash melting treatment device of the second aspect, the same effect as that of the incineration ash melting treatment device of the first aspect is achieved, and the waste plastic P can be evenly supplied to the coke combustion unit 5. The incineration ash H can be more efficiently melted. According to the incineration ash melting apparatus of the third aspect, the same effect as that of the incineration ash melting apparatus of the first aspect is achieved, and the waste plastic P can be reliably supplied by the coke combustion unit 5. . According to the incineration ash melting apparatus of the fourth aspect, the same effect as that of the incineration ash melting apparatus of the first aspect is obtained, and the surface temperature of the coke C is increased and the melting temperature of the slag is increased. In addition, the continuous tapping can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an incineration ash melting apparatus according to the present invention.

FIG. 2 is a side view of a main part.

FIG. 3 is a simplified diagram of a waste plastic supply means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting furnace 5 Coke burning part 6 Incineration ash melting part 7 Exhaust gas combustion part 10 Blast path 13 Wind box 16 Tuyere conduit 37 Tuyere 40 Waste plastic supply means C Coke H Incineration ash

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hirotoshi Murata 5-1-1, Ageocho, Yao City Inside Naniwa Furnace Research Laboratory Co., Ltd.

Claims (4)

[Claims] 1. A lower coke combustion section 5 for burning coke C, an incineration ash fusion section 6 provided above the coke combustion section 5 for melting incineration ash H, and provided above the incineration ash fusion section 6. A melting furnace for incineration ash, comprising a melting furnace 1 having an exhaust gas combustion section 7 for burning CO in a blow path 10 for supplying hot air to a coke combustion section 5 before a tuyere 37 thereof. A waste plastic supply means for melting the incinerated ash H in the incinerated ash melting section 6 by blowing powdered waste plastic together with the hot air and burning with the coke C; Processing equipment. 2. A wind box arranged along the outer periphery of the melting furnace 1.
The apparatus for melting incineration ash according to claim 1, wherein the waste plastic in powder form is supplied to the apparatus (13). 3. A wind box arranged along the outer periphery of the melting furnace 1.
The tuyere conduit 16 that connects and connects the coke combustion part 5 with the
The incineration ash melting treatment apparatus according to claim 1, wherein powdery waste plastic is supplied. 4. The incineration ash melting treatment apparatus according to claim 1, wherein the temperature of the hot air supplied to the coke combustion section 5 is set at 350 ° C. to 450 ° C.