JP2000283448A - Slag hole and method for replacing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recycle without stopping an operation by disposing a first slag hole refractory material fixed to the inside of a furnace and a second slag hole refractory material replaceably at its outside. SOLUTION: A side face of a furnace is surrounded by sidewall bricks 2, and furnace bottom bricks 5 are provided at a bottom. The slag hole comprises inner block slag hole bricks 1 of first slag hole refractory provided in an in- furnace 8 inside, and outer block slag hole bricks 4 of second slag hole refractory provided at an outside of the bricks 1. The bricks 1 are fixed, while the bricks 4 are replaceable. In the hole, the bricks 1, 4 are preferably constituted of silicon carbide bricks each having strong erosion resistance against a molten material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag port of a waste melting furnace, and more particularly to a shaft furnace (blast furnace type, vertical furnace type) gasification and melting furnace which removes non-combustible components in the waste. The present invention relates to a slag port which is continuously discharged (slag) when the slag is discharged from the container and a method for replacing the slag port.

[0002]

2. Description of the Related Art In a blast furnace-type high-temperature gasification and melting furnace in which waste is directly melted into a slag by continuously melting the waste in a continuous process and efficiently recovered as electric energy, a structure capable of continuously and efficiently removing slag is provided. For example, Japanese Patent Laid-Open No. 9-1
No. 96355 and JP-A-9-196356.

[0003] A simple melting mechanism is as follows.

(1) The refuse introduced into the melting furnace is first thermally decomposed in a fluidized bed formed by air supplied from the sub tuyere, where a combustible gas is generated, and a high-temperature reducing atmosphere is generated on a free board. Is maintained and goes to the secondary combustion furnace. The fixed oxygen and ash in the furnace are preheated by forming a fluidized bed together with the limestone, coke, and return fly ash that are charged together with the refuse.

(2) As slag and metal are continuously discharged, ash and the like thermally decomposed in the fluidized bed move to the lower part together with limestone and coke. At this time, hot air having a high temperature and a high oxygen concentration is supplied from the main tuyere at a high speed, and the ash is melted by the combustion of coke and fixed oxygen.

(3) The lower part from the main tuyere is filled with coke which has become high in temperature but not burned out, and slag and metal are dropped in between. Coke has an action not only as an auxiliary fuel but also to form a grate-like packing in the melt decomposition zone.

(4) The slag and metal are continuously discharged from a slag opening opened from the furnace bottom side. Thereafter, the slag that has been dropped into the water tank and quenched becomes sandy, and the metal becomes granular and can be easily separated.

[0008]

In the gasification and melting furnace in which the above-mentioned operation is performed, the vicinity of the high-temperature combustion section of the main tuyere has a high temperature of 1,800 ° C. or more and a reducing atmosphere. The incombustible content of the waste is 1,400 ° C
As described above, slag having a basicity of 1.0 to 1.1 and a metal having a low melting point are present. The melt is continuously discharged from the slag outlet to the outside of the furnace. At this time, the gas in the melting furnace may also be blown out. As a result, the slag port is in a state of being worn out.

In order to facilitate continuous slag removal, a heat retention chamber is provided at the outlet of the slag outlet and heated by an oxygen-propane (kerosene) burner. Therefore, the inside of the furnace is exposed to a high-temperature gas in an oxidizing atmosphere of about 1,500 ° C., and the refractory to be used is under severe conditions.

[0010] In the case where such a slag port becomes slightly blocked, the inside of the slag port may be washed with an oxygen pipe to facilitate the flow of the slag. At this time, the slag refractory is washed by the combustion gas having a high oxygen concentration, and thus is easily subjected to an oxidation reaction.

In consideration of the use conditions as described above, silicon carbide brick has been conventionally selected and used as the refractory around the continuous slag, and the inner diameter of the slag port block has been enlarged by continuous use. In such a case, the damaged tap block is replaced with a new one. When replacing the tap block, shut down the furnace for a long time.
I had to. In the conventional slag outlet, two slag outlets are provided in one furnace, and replacement is performed once every two weeks for simple repair using mud material. At this time, the slag port block is not replaced. Also, it is necessary to replace the slag block once every six months.
To do so, the furnace must be shut down.

As described above, conventionally, it has not been possible to replace the slag outlet while continuing the continuous processing operation of the melting furnace.
Also, in the case of a melting furnace that does not perform continuous slagging, the conventional slag port could not be easily replaced.

Accordingly, an object of the present invention is to provide a tapping port provided in a waste melting furnace, which can be easily replaced.

Further, according to the present invention, it is possible to easily disassemble the bricks by hot work during operation without stopping the processing of the waste melting furnace, and to perform brick stacking operation. An object of the present invention is to provide a method for exchanging a slag outlet.

[0015]

In order to solve the above-mentioned problems, the present invention (claim 1) relates to a slag port provided in a waste melting furnace, wherein the slag port is fixed inside the furnace. Slag, comprising: a first slag refractory disposed at a predetermined position; and a second slag refractory disposed exchangeably outside the first slag refractory. Provide a mouth.

Further, according to the present invention (claim 3), in the slag port provided in the waste melting furnace, the slag port includes a first slag refractory disposed inside the furnace and a second slag port refractory. A second outlet refractory disposed outside of the first outlet refractory, and an exchangeable sleeve inserted into a flow path of waste incombustible portion of the second outlet refractory. A tap hole characterized by including a brick is provided.

Further, according to the present invention (claim 8), in the slag port provided in the waste melting furnace, the slag port includes a first slag port refractory disposed inside the furnace and a second slag port refractory. A second outlet refractory disposed outside of the first outlet refractory, and provided on both side surfaces of the second outlet refractory, which can be disassembled without affecting other members. And a non-conformal refractory layer.

Further, the present invention (claim 11) has two slag outlets, and performs the melting treatment of the waste without stopping, and alternately performs the non-combustible component of the waste from the two slag outlets. In the method for exchanging a tapping port of a melting furnace in which slag is continuously discharged, the two tapping ports are connected to a first tapping port refractory fixedly arranged inside the furnace. And a second slag refractory which is replaceably disposed outside the first slag refractory, while discharging the non-combustible portion of waste from one of the slags while the other. Replacing the second refractory refractory of the refining port of claim 1.

Further, the present invention (Claim 12) has two slag outlets, and performs the melting treatment of the waste without stopping, so that the non-combustible portion of the waste is alternately discharged from the two slag outlets. In the method for exchanging a tapping port of a melting furnace in which slag is continuously discharged, the two tapping ports include a first tapping port refractory disposed inside the furnace, A second outlet refractory disposed outside of the first outlet refractory, and a replaceable sleeve inserted in a flow path of a waste non-combustible portion of the second outlet refractory. The present invention provides a method comprising exchanging a sleeve brick of the other slag while discharging a non-combustible portion of waste from one of the slag outlets.

Furthermore, the present invention (claim 13) has two slag outlets, and performs the melting treatment of the waste without stopping, and alternately performs the non-combustible content of the waste from the two slag outlets. In the method for exchanging a tapping port of a melting furnace in which slag is continuously discharged, the two tapping ports include a first tapping port refractory disposed inside the furnace, A second outlet refractory disposed outside of the first outlet refractory, and provided on both side surfaces of the second outlet refractory, which can be disassembled without affecting other members. , Each including a non-conformal refractory layer,
Discharging the non-conformable refractory layer of the other slag while exchanging incombustibles of waste from one slag port, and replacing the second slag refractory. I will provide a.

The present inventors have studied refractories of all types used as refractories in gasification melting furnaces. As a result, the operating temperature of the slag brick and the basicity of the melt (C
aO / SiO ₂ ) was found to be the condition that controls the wear of refractories from laboratory level and actual furnace tests. Specifically, a refractory which is easily affected by the use temperature of the slag outlet brick and the basicity of the melt, and a refractory which is hardly affected by the same are found as follows.

When the temperature at which the slag is used, that is, the temperature of the molten slag exceeds 1,400 to 1,500 ° C.,
The erosion rate of the tailgate brick increases sharply. Test condition C
/S=1.0, under a reducing atmosphere, clay-high alumina brick is easily affected, and silicon carbide brick is least affected.

The basicity of the melt (CaO / Si
The material which is hardly affected by O ₂ ) is basic brick, and the neutral refractory of alumina-chromia-based brick increases in erosion amount with increasing basicity. On the other hand, in the non-oxide system, the carbon-silicon carbide brick is less affected by the basicity than the silicon carbide brick.

Therefore, the present inventors have selected and used silicon carbide brick as a refractory around a continuous slag, and have studied diligently about a slag port that can be easily disassembled and piled with hot water. Invented the invention.

Hereinafter, the slag port and the method of replacing the slag port of the present invention will be described with reference to the drawings.

FIG. 1 is a partial sectional view showing the structure of an example of the slag port of the present invention. 1 (a) and 1 (b)
FIG. 2 shows a partial cross-sectional view and a partial vertical cross-sectional view of a slag port.

As shown, the side of the furnace has side wall bricks 2.
The furnace bottom brick 5 is provided at the bottom. The slag port includes a first slag refractory internal block slag brick 1 provided on the furnace side 8 and a second slag port provided outside the inner block slag brick 1. It has an outer block tapping brick 4 which is a tapping refractory. The inner block tap brick 1 is fixed, while the outer block tap brick 4 is replaceable. In the illustrated tapping port, an external block tapping brick 4
Is composed of two bricks, 4a and 4b, but one brick is used to form the outer block
May be configured. It is preferable that the inner block tap brick 1 and the outer block tap brick 4 are made of silicon carbide brick which is resistant to erosion from the melt.

The incombustible components in the waste are discharged from the furnace through the slag outlet 3 through the slag outlet. Slag gutter brick 3
Are provided on both sides thereof, which are heated by a heat retaining chamber 6 provided in a heat retaining castable 9.

The slag port having the structure shown in FIG. 1 is applied to a smelting furnace for the slag that performs continuous slagging, thereby exchanging the slag port without stopping the melting process of the slag. It becomes possible. Specifically, two slag outlets configured as shown in FIG. 1 are provided in a predetermined region of a waste melting furnace for performing a continuous slag. The non-combustible material is discharged alternately from the two slag outlets to continuously slag, and the suspended slag outlet is replaced. In exchanging the slag port, first, the flow path for the waste non-combustible material of the inner block slag port brick 1 of the stopped slag port is filled with a mud material. Then, leaving the inner block tap brick 1, the outer block tap brick 4 on the outlet side is replaced.

The tap hole shown in FIG. 1 has an internal block tap brick 1 fixedly arranged on the furnace 8 side and an external block exchangeably arranged outside the internal block tap brick. Since the block has 4 brick taps, two taps can be installed in the melting furnace to replace one of the taps without stopping the melting process of waste. It became.

Here, a conventional slag port will be described with reference to FIG. FIGS. 5A and 5B are a partial cross-sectional view and a partial vertical cross-sectional view of a conventional continuous tapping port, respectively.

As shown, the side surface of the furnace 28 is surrounded by a side wall brick 22, and a bottom brick 25 is provided at the bottom. The non-combustible components in the waste are classified into a slag port constituted by one slag block brick 21 and a slag gutter brick 23.
Through the furnace 28. Irregular refractories 27 are provided on both sides of the slag gutter brick 23, and these are heated by a heat retaining chamber 26 provided in a heat retaining castable 29.

As shown in FIG. 5, since the conventional tapping port is constituted by an integral tapping block brick 21, it is not possible to replace the tapping port without stopping the waste melting process. It was impossible.

FIG. 2 is a partial sectional view showing the configuration of another example of the slag port of the present invention. FIG. 2 (a) and FIG. 2 (b)
Shows a partial cross-sectional view and a partial vertical cross-sectional view of the slag port, respectively.

As shown, the side of the furnace has a side wall brick 2
The furnace bottom brick 5 is provided at the bottom. The slag port includes an inner block slag brick 1 as a first slag refractory, an outer block slag brick 4 as a second slag refractory disposed outside, and an outer block. A block-shaped slag brick 4 is provided with a sleeve-like brick 10 inserted in the flow path of the non-combustible waste. A block key brick 11 is provided on both sides of the outer block tapping brick 4. The sleeve-shaped brick 10 is replaceable, and has a taber in the example shown. This sleeve-shaped brick 10 can be made of a brick made of the same material as that of the slag refractory.

When the sleeve brick 10 is worn out due to the discharge of the melt and the furnace gas, the sleeve brick 10 can be easily removed and replaced with a new sleeve brick. It is also possible to configure the sleeve-like brick with a material different from the refractory at the slag outlet, such as silicon ceramics. Alumina ceramics are expensive and difficult to process, but because they are dense materials that are resistant to oxidation and resistant to gas blowing from the furnace, they can improve the durability against furnace gases. Has strong slag resistance to the melt, so that the durability against the melt can be increased.

In the example shown in FIG. 2, the outer block tap brick 4 is composed of two bricks 4a and 4b, but is not limited to this. The outer block slag brick can consist of one or more arranged bricks.

Other configurations in the illustrated slag port are as follows.
It is the same as that shown in FIG. 1, and the non-combustible components in the waste are discharged from the slag outlet in the same manner as described above.

By applying the slag port configured as shown in FIG. 2 to a waste melting furnace that performs continuous slagging, the slag port can be replaced without stopping the waste melting process. It becomes possible. Specifically, two slag outlets configured as shown in FIG. 2 are provided in a predetermined region of a waste melting furnace for performing a continuous slag. The non-combustible material is discharged alternately from the two slag outlets to continuously slag, and the suspended slag outlet is replaced. In exchanging the slag port, first, the flow path for the waste non-combustible material of the inner block slag port brick 1 of the stopped slag port is filled with a mud material. Next, the sleeve brick 10 inserted in the flow path of the non-combustible waste of the outer block slag brick 4 at the slag port is removed and replaced by inserting a new sleeve brick.

The shape of the sleeve brick 10 at the slag outlet shown in FIG. 2 can be changed as shown in FIG. The tap shown in FIG. 3 is similar to that of FIG. 2 except that a parallel sleeve-like brick 12 having no taper is inserted in the flow path of the waste non-combustible portion of the outer block of the tap. Has the same configuration as that shown in FIG.

The slag port having the structure shown in FIG.
The present invention can be applied to a waste melting furnace that performs continuous slagging in the same manner as the slag port illustrated in FIG. 2, and the slag port can be replaced without stopping the melting process.

The slag port shown in FIGS. 2 and 3 has sleeve-like bricks 10 and 12 which are exchangeably inserted in the flow path of the non-combustible waste of the outer block slag brick 4. Therefore, by providing two such taps in the melting furnace, it is possible to replace the sleeve brick of one of the taps without stopping the melting process of the waste.

FIG. 4 is a partial sectional view showing the structure of another example of the slag port of the present invention. FIG. 4 (a) and FIG. 4 (b)
Shows a partial cross-sectional view and a partial vertical cross-sectional view of the slag port, respectively.

As shown, the side of the furnace has a side wall brick 2
The furnace bottom brick 5 is provided at the bottom. The slag port is composed of an inner block slag brick 1, an outer block slag brick 4 arranged outside the inner block slag brick 4, and an irregular refractory layer (unstable) disposed on both sides of the outer block slag port brick 4. 13). This amorphous refractory layer is preferably an alumina-based patching material that is easy to handle. In the illustrated example, the outer block slag port 4 is formed of one brick, but is not limited to this. The outer block slag brick can consist of one or more arranged bricks.

Other constructions in the illustrated slag outlet are as follows:
It is the same as that shown in FIG. 2, and the non-combustible components in the waste are discharged from the slag outlet in the same manner as described above.

The slag port having the structure shown in FIG. 4 is applied to a smelting furnace for a slag that continuously slags, so that the slag port can be replaced without stopping the melting process of the waste. It becomes possible. Specifically, two slag outlets configured as shown in FIG. 4 are provided in a predetermined region of a waste melting furnace for performing continuous slagging. The non-combustible material is discharged alternately from the two slag outlets to continuously slag, and the suspended slag outlet is replaced. In replacing the slag port, first, the flow path for the waste non-combustible material of the inner block slag port brick 1 of the stopped slag port is filled with a mud material, and then the irregular-shaped refractory layer of the slag port is replaced. 13 is dismantled. This makes it possible to easily remove the outer block tap brick 4. Finally,
A new irregular-shaped refractory layer and an outer block slag port brick are arranged to replace the slag port. At this time, in order to dismantle only the amorphous refractory layer without affecting other members,
It is desired that the thickness be about 10 mm to 30 mm.

The slag port shown in FIG. 4 has an irregular refractory layer 13 provided on both side surfaces of the outer block slag port brick 4. Therefore, two such slag ports are provided in the melting furnace. With the provision, it is possible to replace one of the external block discharging ports without stopping the melting treatment of the waste.

[0048]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to specific examples.

Using a pilot plant having a capacity of 24 tons per day for municipal solid waste treatment, the waste discharging port of the present invention is set to 2
An actual machine test was conducted.

As a test method, first, a state where stable continuous slag is continued from one of the slag outlets is switched to the other slag outlet from this state, and the slag is stopped. Was replaced. At this time, the time required for the replacement of the stopped slag port and the time required for the preheating and opening after the replacement was completed to enable the start of stable slag were measured and compared with the proposed contents.

The components of the replacement time are: (1) a cooling time until the slag opening is closed with the mud material and the replacement is possible; (2) a time for dismantling the brick which is worn and replaced by use;
(3) Time for installing a new brick, (4) Time for heating the brick by heating the slag outlet, opening the slag outlet, and stably flowing hot water.

As the material of the slag port used in all the examples, a silicon carbide brick having a 93% SiC content and a 5% SiO ₂ content was used.

Example 1 As shown in FIG. 1, an internal block litter brick 1 fixedly arranged on the furnace inside 8 side,
An external block tapping brick 4 which is exchangeably arranged on the outside is provided, and the tapping port is divided into two rows. When the bricks are to be replaced while the slag port is stopped, the inner refractory (inner block slag brick) 1 is first filled with a mud material, and the inner block slag port brick 1 is left without being replaced. It was confirmed that the refractory (outer block slag brick) 4 outside the second row could be replaced without stopping the waste treatment of the melting furnace.

However, simply dividing the slag port into two rows as shown in FIG. 1 requires a considerable amount of time to cool the refractory because the brick to be replaced is large, and also removes the slag port brick after cooling. The work also took considerable time.

(Example 2) As shown in FIG. 2, a tapered sleeve-shaped brick 10 was provided in the flow path for the non-combustible waste of the outer block tapping brick 4. Here, the sleeve-shaped brick 10 inserted in the slag port has a SiC content of 99%.
It was composed of the above fine ceramics.

In exchanging the slag port during stoppage, the inside refractory (inner block slag port brick) 1 was first filled with a mud material. Sleeve brick 1 worn by use
When removing the sleeve 0 and inserting a new sleeve-like brick, it was relatively easy and there was no problem in construction. Tended to increase. Therefore, in the test, a parallel sleeve-like brick (a sleeve without a taper) as shown in FIG. 3 was used. Also,
The material thereof was silicon carbide ceramics instead of the same silicon carbide brick as the slag outlet main body. This silicon carbide-based ceramic is relatively expensive, but is a stronger and more dense material than brick due to oxidation resistance.

By providing the slag outlet having such a configuration, simple repair can be performed by replacing only the parallel sleeves, and the replacement time is considerably shortened. However, although the sleeve is made of ceramics having high oxidation resistance, the effective thickness of the sleeve is relatively thin, so that when the sleeve is finally melted, it peels off and falls off.

(Example 3) As shown in FIG. 4, an irregular-shaped refractory layer 13 having a thickness of 20 to 30 mm is disposed on both side surfaces of an outer block slag outlet brick 4, and the slag outlet is exposed to the outer block. Slag brick 4 was retained. The amorphous refractory layer provided here is a patching material having an Al ₂ O ₃ content of 95%.

In replacing the slag port during stoppage, the inside refractory (inner block slag port brick) 1 was first filled with a mud material. In the slag port of the present embodiment, since the outer block slag port brick 4 is removed, some cooling time is required, but on the construction side, the patching material 13 only needs to be broken. For this reason, it was possible to quickly perform the exchange even during hot operation. In addition, since only the brick at the outer block slag can be made into a block and attached, workability is good, and since there is a thick wall, the durability without repair is remarkably improved. The slag port of this example showed stable durability until the end of the furnace.

During the operation, the replacement work of the present structure was carried out. As a result, the replacement could be performed in a short time from the slag outlets of the first and second embodiments.

Table 1 below shows the results of actual machine tests in Examples 1 to 3 in comparison with the conventional system.

[0062]

[Table 1]

As shown in Table 1, according to the present invention,
Using a ton / day-scale pilot plant, while continuing the operation of treating municipal solid waste, the work time is greatly reduced, and the work for efficient replacement of the slag outlet becomes possible. The slag port and the method for exchanging the slag port of the present invention are particularly effectively used in a gasification melting furnace of a shaft furnace type (blast furnace type, vertical furnace type).

[0064]

As described above, according to the present invention, a tapping port provided in a waste melting furnace, which can be easily replaced, is provided. Further, according to the present invention, without stopping the processing of the melting furnace for waste, it is possible to easily disassemble the bricks during operation and to perform brick stacking work, and to perform regeneration without stopping the operation at the time of reuse. A method for replacing a slag port is provided.

By using the present invention, it is possible for the first time to replace the brick at the slag outlet without stopping the operation of melting the waste. In addition, the working time is less than half of the conventional one, and the dismantling and brick-laying work can be performed hot. Therefore, it is possible to easily exchange the slag outlet during the operation.

The present invention is particularly preferably used for a gasification and melting furnace of a shaft furnace (blast furnace type, vertical furnace type) for directly treating waste in a continuous process to form slag, and its industrial value is large. .

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating an example of a configuration of a slag port of the present invention.

FIG. 2 is a partial cross-sectional view illustrating the configuration of another example of the slag port of the present invention.

FIG. 3 is a partial cross-sectional view illustrating a configuration of another example of the slag port of the present invention.

FIG. 4 is a partial cross-sectional view illustrating a configuration of another example of the slag port of the present invention.

FIG. 5 is a schematic view showing a conventional continuous tapping port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Internal block slag brick 2 ... Side wall brick 3 ... Slag gutter brick 4 ... Outer block slag brick 5 ... Furnace bottom brick 6 ... Heat insulation room 7 ... Irregular refractories 8 ... Inside the furnace 9 ... Heat insulation Castable for 10 ... Sleeved brick with taper 11 ... Block key brick 12 ... Sleeved brick without taper 13 ... Amorphous refractory layer (Amorphous castable) 21 ... Slag block 22 ... Side brick 23 ... Slag gutter brick 25 ... Furnace bottom brick 26 ... Heat retention room 27 ... Irregular refractories 28 ... Inside the furnace 29 ... Castable for heat retention

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuneo Matsudaira 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Masahiro Sudo 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan (72) Inventor: Yuichi Yamakawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Nihon Kokan Co., Ltd. (72) Inventor: Yasuo Suzuki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan (72) Inventor Shintaro Sudo 2-2-1 Otemachi, Chiyoda-ku, Tokyo Shinagawa White Brick Co., Ltd. (72) Inventor Toshio Watanabe 2-2-1 Otemachi, Chiyoda-ku, Tokyo Shinagawa Inside the White Brick Co., Ltd. (72) Inventor Masanori Nakano 2-2-1 Otemachi, Chiyoda-ku, Tokyo Shinagawa White Brick Co., Ltd. F-term (reference) 3K061 AA16 AB03 AC01 BA05 DB11 NB27

Claims (14)

[Claims] 1. A slag port provided in a waste melting furnace, wherein the slag port is a first slag refractory fixedly disposed inside the furnace, and the first slag port. A second tapping refractory which is replaceably disposed outside the refractory. 2. The refractory of the first and second slag outlets,
2. The slag port according to claim 1, wherein the slag port is made of silicon carbide brick. 3. A slag port provided in a waste melting furnace, wherein the slag port includes a first slag port refractory disposed inside the furnace, and a first slag port refractory. And a replaceable sleeve brick inserted in a flow path of a waste incombustible portion of the second tailgate refractory. Slag outlet. 4. The slag port according to claim 3, wherein the replaceable sleeve-like brick is made of the same material as the slag refractory. 5. The discharge sleeve according to claim 3, wherein the replaceable sleeve-like brick is made of a material having a higher oxidation resistance than the slag refractory or a material having a slag resistance that is stronger against a molten material. Slag mouth. 6. The slag port according to claim 3, wherein the replaceable sleeve-like brick has a tapered shape. 7. The slag port according to claim 3, wherein the replaceable sleeve-like brick has a shape having no taper. 8. A slag port provided in a waste melting furnace, wherein the slag port includes a first slag port refractory disposed inside the furnace, and a first slag port refractory. A second tailgate refractory disposed outside; and an irregular-shaped refractory layer provided on both side surfaces of the second tailgate refractory and capable of being disassembled without affecting other members. Slag outlet characterized by including. 9. The slag port according to claim 8, wherein the thickness of the irregular-shaped refractory layer is 10 mm or more. 10. The slag port according to claim 8, wherein the irregular-shaped refractory layer is an alumina-based patching material. 11. It has two slag outlets and continuously discharges non-combustible waste from the two slag outlets by performing the melting treatment of the waste without stopping. In the method for exchanging a slag port of a melting furnace for performing slag, the two slag ports are a first slag port fixedly arranged inside the furnace.
, And a second slag refractory which is exchangeably arranged outside the first slag refractory. While exchanging the second refractory of the other slag while discharging the slag. 12. It has two slag outlets, and performs the melting treatment of the waste without stopping, and discharges the non-combustible portion of the wastes alternately from the two slag outlets, thereby continuously. In the method for exchanging a slag port of a melting furnace for performing slag, the two slag ports are a first slag refractory disposed inside the furnace and an outer side of the first slag port refractory. And a replaceable sleeve-like brick inserted in the flow path of the waste incombustible portion of the second outlet refractory. A method characterized by exchanging the sleeve brick of the other slag while discharging the non-combustible waste from the slag. 13. Having two slag outlets and continuously discharging the non-combustible waste from the two slag outlets by performing the melting treatment of the waste without stopping. In the method for exchanging a slag port of a melting furnace for performing slag, the two slag ports are a first slag refractory disposed inside the furnace and an outer side of the first slag port refractory. And a non-conformable refractory layer provided on both sides of the second refractory refractory and capable of being disassembled without affecting other members. While discharging the incombustibles of waste from one of the outlets, dismantling the irregular refractory layer of the other outlet and replacing the second outlet refractory. how to. 14. The method according to claim 11, wherein the melting furnace is a shaft furnace type gasification melting furnace.