JP2003139317A - Bottom structure for electric ash melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lifting of a refractory block composing a bottom section of an electric ash melting furnace, prevent damage of a joint part, prevent intrusion of molten metal or slag, and protect bottom lining. SOLUTION: In the bottom structure, an end part of a refractory block row composing a bottom section of the electric ash melting furnace is held down by a lower end of a side wall 15 of a furnace body 10. It is characterized by that a groove 17 is formed in a side face longitudinal direction of a refractory block adjacent to a longitudinal direction of the refractory block 14, and the refractory blocks are mutually coupled by fitting a plug brick 19 as tightly as possible in a plug brick inserting space 18 formed by incorporation of the groove 17 of the adjacent refractory block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric ash melting furnace, and more particularly to a furnace bottom structure thereof.

[0002]

2. Description of the Related Art The incineration ash generated when incinerating waste in a waste incinerator has been conventionally treated by landfill, but its amount is enormous, and its treatment is not easy. Since there is a problem such as the generation of ash, the incineration ash has recently been melted in a melting furnace to reduce the volume, and at the same time, the elution control and reuse of organic substances can be achieved.

As the ash melting furnace, there are an electric smelting furnace and a fuel melting smelting furnace, but the electric smelting furnace, which has a relatively simple facility and can be obtained at low cost, has been attracting attention.

In this electric melting furnace, as shown in the schematic sectional view of the AC type in FIG. 9, electrodes 3, 3 ... Are hung from the furnace top 2 of the furnace body 1, and this furnace top is An incinerator ash charging port 4 and a generated gas discharging port 5 are opened at 2 and the furnace wall 1
A molten metal discharge port 6 is opened at the lower end of a, and a molten slag discharge port 7 is opened at a position above the molten metal discharge port 6 and out of phase with the molten metal discharge port 6.

When the ash melting furnace is started up, a base metal a is formed on the furnace bottom portion 1b by arc discharge or the like, and incineration ash or the like is put on the base metal a to form a molten slag layer b. Next, the electrodes 3, 3, ... Are inserted into the molten slag layer b, electricity is applied to the molten slag layer b to generate electric resistance, the high temperature molten slag layer b is maintained, and incineration ash or the like is sequentially charged to melt.

Molten metal is discharged from the molten metal discharge port 6 and molten slag is discharged from the molten slag discharge port 7 at appropriate times.

In the bottom structure of the ash melting furnace as described above, the block shape is enlarged to reduce the number of objects in order to prevent melting damage from the joint between the refractory blocks constituting the conventional furnace bottom. A block made of a carbon-SiC refractory is used for the purpose of reducing the joint thickness.

And 500 to 700 m in the plane inside the furnace
The refractory block row divided by m width is 2 in the longitudinal direction.
The trapezoidal block is divided into three parts, and is constructed so that the upper surface of the refractory block at the end is pressed by the lower end of the side wall brick.

[0009]

However, in the bottom structure of the conventional electric ash melting furnace described above, a sufficient holding effect cannot be obtained even by holding down by the side wall bricks on the outer peripheral portion, and the joint between the refractory blocks is formed. There has been a problem that a gap is created and molten metal or slag invades through the gap, damaging the joint and its peripheral portion. As a result, part of the refractory block floated up, and molten metal and slag entered the furnace bottom lining to raise the temperature of the bottom plate, resulting in a hindrance to operation.

The present invention has been made to solve the above-mentioned conventional problems, and prevents the refractory block constituting the bottom of the ash melting furnace from rising, thereby preventing damage to the joints. The purpose is to be able to achieve protection of the furnace bottom lining due to intrusion of molten metal and slag.

[0011]

As a means for solving the above problems, the present invention is designed so that the end of the refractory block row constituting the furnace bottom of the electric ash melting furnace is pressed by the lower end of the side wall of the furnace body. In the hearth bottom structure, a groove is formed in the side surface longitudinal direction of the refractory block adjacent to the longitudinal direction of the refractory block, and the plug brick is inserted into the plug brick insertion space formed by the combination of the grooves of the adjacent refractory blocks. It is characterized in that the refractory blocks are connected to each other by fitting as closely as possible.

As a result, even if the refractory blocks forming the bottom of the furnace are made large, the rising of the blocks is prevented by the mutual connection of the refractory blocks by the plug bricks, and the joints between the refractory blocks are prevented. It is possible to prevent damage to the furnace, and to prevent the molten metal and slag from penetrating from the joint to prevent the furnace bottom lining from being heated.

The above-mentioned connection with the plug bricks can sufficiently exert the effect only at the central portion of the refractory block row, but it is preferably applied to the entire refractory block.

The groove has a semi-circular cross section so that a plug brick insertion space having a circular cross section is formed by combining with the groove of an adjacent refractory block, and the plug brick is packed into the plug brick insertion space as closely as possible. Practically preferred is a cylindrical shape that can be inserted.

If the stamp material is filled between the end face of the refractory block row and the perm brick forming the side wall of the furnace body with a thickness sufficient to absorb the thermal expansion of the refractory block, The stamp material can be made to absorb the thermal expansion to further prevent the refractory block from rising.

If a non-standard refractory such as a stamp material or a castable is filled between the lower surface of the refractory block and the furnace bottom lining, the furnace bottom lining can be protected from damage caused by the intrusion of metal and slag. preferable.

Further, if the refractory block is formed in a trapezoidal shape in a side view and the refractory blocks are alternately inverted so that the inclined surfaces are in contact with each other and arranged, the refractory block is prevented from rising. Is more preferable.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, description will be given with reference to embodiments shown in the drawings of the present invention.

FIG. 1 is a plan view of an embodiment of a furnace body 10 of an electric ash melting furnace according to the present invention, and FIG. 2 is AA of FIG.
A cross section and FIG. 3 show the same cross section.

In the furnace body 10, a furnace bottom lining 12 is applied to the entire lower bottom portion of the iron shell 11, and a perm brick 13 is laminated on the furnace bottom lining 12 along the inner surface of the iron shell 11. The refractory blocks 14, 14, ... (Hereinafter abbreviated as a block and represented by reference numeral 14) are arranged in a range surrounded by the perm brick 13.

On the upper surfaces of the end portions of the blocks 14, 14 ... Rows, the lower ends of the side wall bricks 15 (lining bricks), which are laminated on the inner circumference of the perm bricks 13, are placed to press down the blocks. It is done like this.

The blocks 14, 14 ... Are formed in a trapezoidal shape in a side view as shown in FIG. 2, and these blocks are alternately inverted to form inclined surfaces 14a, 14a at their end faces.
Are abutted directly or through the joint material.

A stamp material 16 is filled between the end faces of the rows of blocks 14, 14 ... And the perm bricks 13 with a thickness capable of absorbing the thermal expansion of the blocks 14, 14.

[0024] side surface of the block 14 ₁ located in the central region of the block 14, 14 columns, the longitudinally grooves 17 of semicircular cross section as shown in FIG. 5 are formed, adjacent circular cross section of the plug brick insertion space 18 when combined with the groove 17 of the block 14 ₁ is formed, this space 1
A plug brick 19 formed in a cylindrical shape can be fitted into 8 as closely as possible.

The shape of the groove 17 is not limited to the semicircular cross section, but may be any other suitable shape such as trapezoidal shape or square shape, and the plug brick insertion space 18 formed by this is possible. The plug brick that fits into the plug can also have a cross-sectional shape suitable for it.

In FIG. 7, an unshaped refractory material 20 such as a stamp material or castable is interposed between the blocks 14, 14 ... And the furnace bottom lining 12, and molten metal or slag is temporarily assumed to be present between the blocks 14, 14. Even if it penetrates, the bottom of the hearth 12
This shows a case in which the furnace bottom lining 12 is not reached. By doing so, the protection of the furnace bottom lining 12 can be made even more reliable.

As a specific embodiment, in block 14,
The width is 500-700 mm, and it is in the length direction of the block row.
Each is divided into three, and the block in the center of the block row
14 ₁Is a trapezoid with a long lower side, and blocks on both sides
14_Two, 14_TwoUses a trapezoid with a long upper edge
It And blocks 14 on both sides_Two, 14_TwoTop surface of the end of
The lower end of the side wall brick 15 to restrain it, and
As the brick 19, the above-mentioned columnar one was used.

Stamp material 1 to be filled at the end of the row of blocks
No. 6 was used for an actual machine by setting the compression rate of the stamp material 16 within 10% with respect to the amount of thermal expansion at the operating temperature of the block 14.

According to the above-described embodiment, the rising of the block 14 _{1 in} the central area is prevented by being connected to the adjacent block 14 ₁ by the plug bricks 19, and the central block 14 _{1 is connected} to the upper side. Has a short trapezoid, and the blocks 14 ₂ and 14 ₂ on both sides are inverted trapezoids with long upper sides so that the central block 14 ₁ is constrained by the inclined surfaces 14 a and 14 a, so that the block 14 _{1 in} the central portion rises up. I was able to prevent it further.

Further, the end face of the block row and the perm brick 13
By filling the stamp materials 16 and 16 between and, the stamp materials 16 and 16 absorb the thermal expansion of the block row, and thus the bulging due to the thermal expansion of the block 14 can be prevented.

In the above-described specific embodiment, the block 14 ₁ located at the center of the block row is connected to the adjacent block 14 ₁ by the plug brick 19, and this also shows that the center of the block 14 ₁ is most likely to squeeze. Although it is possible to prevent looming up of blocks 14 ₁ sufficiently be prevented approaching up of all the blocks 14 _1, 14 _2, 14 ₂ more blocks if to mate with that of the vicinal by plugs bricks for It is possible to prevent the joint portion from being damaged.

FIG. 8 shows a case where the block 14 has a trapezoidal shape when viewed from the front, and by doing so, it is possible to provide a further effect of preventing the pressure from rising.

[0033]

As described above, according to the present invention, the refractory blocks laid at the bottom of the electric ash melting furnace are connected to each other by plug bricks. By preventing this rising, it is possible to prevent damage to the joints between blocks in advance, and to prevent heating damage to the furnace bottom lining due to intrusion of molten metal or slag. The protection of

If a stamp material that absorbs thermal expansion of the block row is filled between the end of the block row and the perm brick on the side wall, the stamp material can absorb the rising force that accompanies the thermal expansion of the block. It is possible to further prevent the block from rising.

Further, if a stamp material, castable, or other irregular refractory material is filled between the lower surface of the block and the bottom lining of the block, even if molten metal or slag invades from between the blocks, the bottom lining of the bottom will be provided. The influence can be prevented, and the protection of the furnace body can be made more reliable.

Then, the block is formed into a trapezoidal shape in side view,
If these blocks are alternately inverted and the inclined surfaces are used to constrain the blocks, further rising can be prevented.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a furnace body of an electric ash melting furnace according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is an enlarged cross-sectional view showing a joined portion of a refractory block.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is a partial cross-sectional view showing a structure of an end portion of a block row.

FIG. 7 is a partial cross-sectional view showing a case where an amorphous refractory material is filled between the lower surface of the block and the furnace bottom lining.

FIG. 8 is a sectional view showing an example of the shape of a block.

FIG. 9 is a sectional view showing an example of an electric (AC) ash melting furnace to which the present invention is applied.

[Explanation of symbols]

1,10 Furnace body 3 Electrode 4 Burnt ash inlet 5 Generated gas outlet 6 Molten metal outlet 7 Molten slag outlet 11 Iron crust 12 Furnace bottom lining 13 Perm brick 14 (14 ₁ , 14 ₂ ) Refractory block 15 Sidewall bricks (lining bricks) 16 Stamp material 17 Grooves 18 Plug brick insertion space 19 Plug bricks 20 Unshaped refractories

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme Coat (reference) F27D 1/04 F27D 1/04 Z (72) Inventor Jun Ueki 9-1, Kitan Kitakita, Chiyoda-ku, Tokyo 7th item Kawasaki Brick Co., Ltd. F term (reference) 3K061 NB02 NB28 3K065 AA23 AB03 AC03 FA03 FA08 FB02 FB07 4K051 AA05 AB05 BD03 BD07 DA02 DA08

Claims (5)

[Claims] 1. A furnace bottom structure in which an end portion of a refractory block row forming a furnace bottom portion of an electric ash melting furnace is pressed down by a lower end of a side wall of a furnace body, and the refractory block is adjacent to a longitudinal direction of the refractory block. Form a groove in the longitudinal direction of the side surface of the refractory block,
A furnace bottom of an electric ash melting furnace characterized in that a refractory block is connected to the refractory block by inserting the refractory block as closely as possible into a plug brick insertion space formed by combining the grooves of adjacent refractory blocks. Construction. 2. The groove has a semi-circular cross section so that a plug brick insertion space having a circular cross section is formed by combining with the groove of an adjacent refractory block, and the plug brick can be inserted into the plug brick insertion space. The furnace bottom structure of the electric ash melting furnace according to claim 1, wherein the furnace bottom structure has a cylindrical shape that can be fitted as closely as possible. 3. The stamp material is filled between the end surface of the refractory block row and the perm brick constituting the furnace side wall with a thickness sufficient to absorb thermal expansion of the refractory block. The bottom structure of the electric ash melting furnace according to 1 or 2. 4. The electric ash according to any one of claims 1 to 3, wherein an unshaped refractory such as a stamp material or a castable is filled between the lower surface of the refractory block and the lining of the furnace bottom. Bottom structure of melting furnace. 5. The refractory block is formed in a trapezoidal shape in a side view, and the refractory blocks are alternately inverted so that the inclined surfaces are in contact with each other and arranged. Bottom structure of the electric ash melting furnace.