JPH09117733A - Method for melting incineration ashe and its melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the local erosion of furnace walls and to prolong the life of a furnace by allowing the erosion to progress evenly over the entire surface of the walls in the furnace, unlike a furnace fixed with a melt storage section, as incineration ashes melt in the rotating furnace body and the molten slag comes into contact successively with the inside walls of the furnace. SOLUTION: This melting furnace consists of the approximately cylindrical furnace body 10 of a horizontal installation type which is internally lined with refractory thermal insulating materials 10a and has apertures 11a, 11b of a small diameter at both ends, a rotating mechanism 15 which supports and rotates this furnace body, a direct fire burner which is mounted at either of these apertures, an incineration ashe supply pipe 5 to be mounted at either of the apertures, a hood 26 which encloses the other aperture and a tilting mechanism 20 which tilts the furnace body. The local erosion of the furnace is prevented by bringing the melt into uniform contact with the inside walls of the furnace. As a result, the melting furnace for the incineration ashes constituted to melt the in-furnace incineration ashes with a direct fire burner while rotating the furnace body and the discharge the molten incineration ash melt from the other aperture 11b is obtd.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to incineration ash of sewage sludge,
The present invention relates to a method for melting incineration ash such as incineration ash of industrial waste or fly ash, and a melting furnace therefor.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed as a method for treating industrial waste, one of which is to incinerate the industrial waste, melt the incinerated ash, and then solidify it to reduce the volume. And there is a method to throw away the heavy metals. In this method, in order to melt the incinerated ash, for example, as disclosed in Japanese Patent Laid-Open No. 7-155721, the incinerated ash is supplied to a storage part of a stationary melting furnace and heated by a burner to melt it. The method of doing is widely adopted.

[0003]

However, since the above method melts the incineration ash in the fixed and fixed melting furnace, the molten slag (melt) is always stored at a fixed position.
Then, the inside of the melting furnace is lined with a refractory heat insulating material, but in this refractory heat insulating material, the storage portion portion where the molten slag is in contact, that is, the contact portion with the molten slag is constant, so erosion in this portion It has a serious problem that the furnace must be frequently repaired. Therefore, an object of the present invention is to provide a method for melting incinerator ash, which melts a molten material by uniformly contacting the inner wall of the furnace without storing the molten material in a certain position of the furnace, and a melting furnace therefor.

[0004]

According to the present invention, in order to achieve the above object, in claim 1, incinerator ash is charged into a furnace body rotatable about a horizontal axis to rotate the furnace body. The incineration ash is heated and melted by an open flame burner while being heated. In claim 2,
The open flame burner is an oxygen burner. In Claim 3, the incineration ash is pelletized. In Claim 4, a furnace main body of a horizontal installation type substantially cylindrical body in which a refractory heat insulating material is lined and both end openings have a small diameter, and a rotating mechanism for supporting and rotating the furnace main body. A direct flame burner attached to any one of the openings, an incinerator ash supply pipe attached to one of the openings, a hood surrounding the other opening, and a tilting mechanism for tilting the furnace body. The incineration ash melted by the open flame burner is discharged from the other opening.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. First, the melting furnace T according to the present invention
A method of melting the incineration ash by using the will be described according to the flow shown in FIG. Incinerated ash such as sewage sludge that has been put into the hopper 1 is sent to the granulator 3 by the quantitative feeder 2 and formed into pellets of a predetermined shape, which are stored in the ash pellet supply device 4, from which the ash pellet supply pipe 5 will be described below. Is supplied into the melting furnace T by a constant amount, and is heated and melted by the open flame burner 7. As will be described in detail below, this melting furnace T includes a horizontally installed substantially cylindrical furnace body 10 that rotates about a horizontal axis, and the molten incineration ash melts from the opening (molten slag extraction port) 11b with water. After being dropped and solidified in the cooling water in the sealing pit 40, it is carried out by the conveyor 41. Further, the gas in the furnace ejected from the opening 11b is exhausted by the exhaust fan 3
2 enters the bag filter 33 from the hood 26, where floating fly ash and the like are collected.

Next, the melting furnace T will be described in detail.
The melting furnace T generally includes a furnace body 10, a rotating mechanism 15 that supports and rotates the furnace body 10, a tilting mechanism 20 that tilts the furnace body 10, an ash pellet supply pipe 5, and an open flame burner 7. , Hood 26. And the furnace body 10
Is lined with a fireproof heat insulating material 10a and has openings 11 at both ends.
a and 11b are horizontal installation type cylindrical bodies having a small diameter, one opening 11a constitutes a mounting portion for an ash pellet supply pipe 5 and an open flame burner 7 described below, and the other opening 11b extracts molten slag. Has become a mouth. The molten slag extraction port 11b has four triangular notches 12 in the circular opening 12a.
b is provided at equal intervals (see FIG. 3). Reference numeral 13 denotes two rails provided on the outer circumference of the body of the furnace body 10, and the respective opposing side surfaces of the rails 13 and 13 are adapted to contact a stopper roller 13a attached to a support base 16 described below.

As shown in FIGS. 2 and 4, the rotating mechanism 15 has a support base 16 provided with a pair of rollers 17 for supporting the rails 13 of the furnace body 10 on the upper surface, and the support base 16.
A support plate 19 standing upright so as to be located between the rails 13 and 13, and installed on the support base 16.
It comprises at least a motor 18 for driving one of the rollers 17.

The tilting mechanism 20 is installed on the ground, and is composed of a support column 21 having a bearing 22 on the upper portion thereof, a motor or a handle 23 provided on the support column 21, and the like. The rotating shaft 24 protruding to the above is connected to the motor 23 via the bearing 22, and the driving of the motor 23 tilts the furnace body 10 by a predetermined angle.

The ash pellet supply pipe 5 and the open flame burner 7 close the opening 11a as shown in FIGS.
A disk-shaped cover 2 which is relatively rotatable and can be attached and detached by an appropriate means.
5 is provided so as to penetrate the disk-shaped cover 25 at a symmetrical position with respect to the center of the ash pellet 5, and the tip of the ash pellet supply pipe 5 can supply the ash pellet W to the molten reservoir A of the furnace body 10. It projects into the furnace. Further, the direct flame burner 7 is an oxygen burner in the embodiment, and is connected to an O ₂ source and a fuel source such as LPG. The O ₂ source may be an air adsorption separator (PSA).

The hood 26 is opened downward and has an opening 27 on one side of the upper part. The hood 26 is mounted on a rail (not shown), and the elastic body 2 such as a spring is attached to the tip of the rod.
As shown in FIG. 2, a cylinder 28 provided with 9 is arranged to approach the outside of the opening 11b of the furnace main body 10, and is moved in the direction a by the cylinder 28 to be separated from the furnace main body 10. A waste air pipe 30 communicating with the inside of the hood is attached to the hood 26, and the waste air pipe 30 is connected to a bag filter 33 connected to an exhaust fan 32 via a sliding joint 31.

Next, the operation of the melting furnace T having the above construction will be described. First, as shown in FIG. 2, the furnace body 1
0 is in a horizontal state, the ash pellet supply pipe 5 and the open flame burner 7 are attached to the opening 11a so as to be rotatable relative to each other by means not shown, and the hood 26 is attached to the cylinder 28. Moving and opening 2
While covering the outside of the opening 11b of the furnace body 10 with 7,
The exhaust fan 32 is driven.

Then, the roller 17 is driven by the motor 18.
By rotating the furnace body 10 to ignite the open flame burner 7 to heat the furnace body 10, and the furnace temperature is 700 to
When the temperature reaches 800 ° C., the ash pellets W are supplied from the ash pellet supply device 4 into the furnace at a constant rate. Then, the ash pellet W has a volume of 0.7 to 0.8 (FIG.
When the ash pellets W are in a molten slag state (the furnace temperature is, for example, 1400 ° C.), the ash pellets W are temporarily charged in the furnace again. Continuously add to. In this case, since the ash pellets W are charged from one furnace wall side of the melting storage portion A as shown in FIG. 5, the ash pellets W are supplied into the molten slag S so as to be caught in the molten slag S as the furnace body 10 rotates. , Rapidly melted.

As described above, the molten slag S surface rises due to the continuous charging of the ash pellets W, and the notch 1 of the opening 11b is formed.
When 2b reaches the lowest point, a certain amount of the molten slag S flows out, the outflowing molten slag S falls into the water sealing pit 40 below, and is cooled and solidified by the cooling water, and then the conveyor 41.
Is carried out to a predetermined place. The furnace body 10 rotates once every two minutes, and the molten slag S is melted at a rate of twice a minute.
Is preferably drained.

In order to stop the operation of the melting furnace T, the supply of ash pellets W in the furnace is stopped, the open flame burner 7 is extinguished, and at the same time the rotation of the furnace body 10 is stopped so that the temperature in the furnace falls to a constant temperature. After that, the drive of the exhaust fan 32 is stopped. Then, the disk-shaped cover 25 is removed from the furnace body 10, and the hood 26 is attached to the furnace body 1 by the cylinder 28.
Separate from 0.

Next, the motor or the handle 23 is operated to tilt the opening 11b of the furnace body 10 downward, and the molten slag S remaining in the molten storage portion A in the furnace is charged into the water sealing pit 40. After that, the furnace body 10 is returned to the horizontal state, and the hood 26 and the disk-shaped cover 25 are returned to the original state to stand by for the next operation.

In the above description, the open flame burner 7 is arranged on the ash pellet supply pipe 5 side to be an oxygen burner, but it may be arranged on the hood side as shown in FIG. Also, the incinerated ash may be in the form of ash without being pelletized. In this case, if the ash is supplied from the furnace wall side of the molten storage portion A as described above, it is caught in the molten slag S and supplied into the molten slag S, so that the ash can be melted with almost no scattering. Further, it goes without saying that the incineration ash is not limited to the sewage sludge incineration ash.

[0017]

As is apparent from the above description, claim 1
According to the invention of claim 1, since the incineration ash is melted in the rotating furnace body, and this molten slag sequentially contacts the inner wall of the furnace, the erosion progresses uniformly over the entire inner wall of the furnace unlike the conventional one in which the molten reservoir is fixed. The life of the furnace body, which is greatly affected by the corrosion of the refractory material, can be greatly extended. When the direct-burning burner is an oxygen burner as in claim 2, a high-temperature flame can be obtained, and the efficiency of melting can be improved by the radiant heat transfer effect thereof. Outside the furnace can be reduced. When the incinerated ash is formed into pellets as in the third aspect, it is possible to accurately control the supply amount in the furnace and prevent scattering at the time of charging. If the melting furnace is configured as shown in claim 4, in addition to the above effects, the hood and the open flame burners and the incinerator ash supply pipe located on both sides of the furnace body can be separated from the furnace body.
The tilting mechanism also allows the melt remaining in the storage portion of the furnace body to easily flow out. Moreover, since the furnace body is substantially cylindrical and has a simple shape, the refractory material can be replaced easily.

[Brief description of the drawings]

FIG. 1 is a diagram showing a melting furnace according to the present invention and an operation flow thereof.

FIG. 2 is a sectional view of a melting furnace.

FIG. 3 is an enlarged front view of the opening (extraction port) of FIG.

FIG. 4 is a side view of FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a partial sectional view showing another embodiment of the melting furnace.

[Explanation of symbols]

4 ... Ash pellet supply device, 5 ... Ash pellet supply pipe, 7 ...
Open flame burner, 10 ... Furnace body, 10a ... Insulation material, 11a,
11b ... Aperture, 13 ... Rail, 15 ... Rotation mechanism, 17
... roller, 18 ... motor, 20 ... tilting mechanism, 21 ... support pillar, 22 ... bearing, 23 ... handle, 24 ... rotary shaft, 25
… Disc-shaped cover, 26… Hood, 32… Exhaust fan, 3
3 ... Bag filter, 40 ... Water sealing pit, W ... Ash pellet.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takao Aoba 2-4-7 Kyomachibori, Nishi-ku, Osaka-shi, Osaka Inside Chugai Furnace Industry Co., Ltd. (72) Yoshito Sakaguchi 2-chome, Kyomachibori, Nishi-ku, Osaka-shi, Osaka No. 4-7 Chugai Furnace Industry Co., Ltd. (72) Inventor, Etsue Murata Eight-share company, Naniwa Reactor Research Institute, 5-1, Ageo-cho, Yao-shi, Osaka

Claims (4)

[Claims] 1. An incinerator ash which is put into a furnace body rotatable about a horizontal axis, and the incinerator ash is heated and melted by an open flame burner while rotating the furnace body, and the incinerator ash is melted. Melting method. 2. The method for melting incineration ash according to claim 1, wherein the direct burner is an oxygen burner. 3. The method for melting incinerated ash according to claim 1, wherein the incinerated ash is pelletized. 4. A furnace body of a horizontal installation type substantially cylindrical body in which a refractory heat insulating material is lined and openings at both ends have a small diameter, a rotating mechanism for supporting and rotating the furnace body, and the opening. An open flame burner attached to any one of the above, an incinerator ash supply pipe attached to one of the openings, a hood surrounding the other opening, and a tilting mechanism for tilting the furnace body,
The incinerator ash melting furnace, wherein the incinerated ash melted by the open flame burner is discharged from the other opening.