JPH1078289A - Cylindrical rotary furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve refractory properties and to reduce a manufacturing cost, by constituting a wall of a rotary furnace by many guadrangular prism hanger bricks arranged in circumferential and lengthwise directions to direct a rotating centerline and by a bonding material to be embedded in gaps between the bricks and solidified therebetween. SOLUTION: In a cylinder 4 of the rotary furnace l, standard A type refractory heat insulation hanger bricks 10 are, for example, arranged so that 20 pieces are aligned in a circumferential direction and 13 rows (first row is disposed adjacently in parallel at left side of a protrusion 7 and the other twelve rows are aligned at right side) are aligned in a lengthwise direction (bus line direction), and totally 260 pieces are snugly aligned. A core corresponding to a cavity 31 is inserted into a central portion of the brick mounts, and assembled in a female mold. Thereafter, when bonding materials 11 are embedded in a space (including the protrusion 7) between the bricks 10, and solidified to each other. Thus, refractory properties of the furnace 1 can be sufficiently performed, thereby obtaining the low-cost furnace 1 having high performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cylindrical rotary furnace, and more particularly to a rotary furnace structure suitable as a part of a melting facility for melting and processing residual ash after combustion of household waste or industrial waste. .

[0002]

2. Description of the Related Art Conventionally, a cylindrical rotary furnace used for casting equipment has a tapered cylindrical shape with a large diameter at the center and small diameters at both ends, and a furnace wall for melting iron is made of a heat-resistant material such as a brick. .

[0003]

However, even if this conventional cylindrical rotary furnace is used for a rotary furnace as a part of a melting facility for melting ash of a combustion ash, it is used for a casting facility. However, they are not easily used, are expensive, and have drawbacks in durability. The present invention
It is an object of the present invention to provide an inexpensive, durable, newly-developed cylindrical rotary furnace, a so-called rotary furnace refractory structure.

[0004]

According to the present invention, in order to achieve the above object, there are provided a plurality of prismatic pillars having a furnace wall of a rotary furnace arranged circumferentially and longitudinally so as to face a rotation center line. It is composed of a hanger brick and an injecting material injected so as to fill and join a gap between these bricks.

According to the present invention, since the inside of the furnace wall exposed to the ash melt is mostly constituted by a hanger brick (brick) separately manufactured as a fire-resistant and heat-insulating brick, the present invention has heat resistance and durability. . In addition, since the hanger brick has a single product, versatility, and uniform quality, the fire resistance of the whole rotary furnace is improved and the manufacturing cost is reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

First, the overall configuration will be described with reference to FIGS. The rotary furnace 1 is supported by a frame (not shown), and rotates about a horizontal center line. The rotary furnace 1 has a substantially cylindrical shape with an outer diameter of 2 m and a total length of 4 to 5 m. And a first opening 2 connected to a fuel and oxygen supply port (burner), and from the first opening 2 to a cylindrical portion 4 of the main part of the furnace through a divergent first conical portion 3. Near the left end of the cylindrical portion 4 is provided a protruding portion 7 protruding in the circumference, beyond this, once returning to the cylindrical portion and passing through the converging second conical portion 5, a second opening 6 for exhaust. Leads to

The second conical portion 5 is provided with two outwardly inclined molten material (slag) discharge ports 8 for melting molten slag accumulated in the furnace wall 9 when the rotary furnace 1 is inclined. Can be discharged from

The furnace wall 9 of the rotary furnace 1 is composed of a separately manufactured hanger brick (brick) and an injection material for joining these. The injection material is a mixture of refractory porous raw materials called casters, lightweight casters or castables, and alumina, cement or the like.

The cylindrical portion 4 is composed of 20 standard A-shaped hanger bricks 10 having fire-resistant and heat-insulating properties in the circumferential direction, and 13 rows in the longitudinal direction (general direction) (the first row is on the left side of the projection 7 and other rows). (The 12 rows are adjacent to each other on the right side in parallel.) A total of about 260 pieces are arranged in a line. The hanger brick 10 is obtained by kneading and firing a mixture of clay, high alumina sand and the like.

The space (including the protrusion 7) between the bricks 10 is buried with the above-described injection material 11 and integrally joined.

Further, the first conical portion 3, the first opening 2, and the second
For the conical portion 5 and the second opening 6, a special B-shaped heat-resistant hanger brick 12 that fits the tapered conical shape is prepared, and this is turned to the left, for example, 19, 16 in the circumferential direction. 14
Similarly, on the left side as well, there are 16 pieces, 8 pieces, 8 pieces and 6 pieces on the right and left, about 80 pieces in total, and these are joined by the injection material 11.
The B-type hanger brick is formed of the same material as the A-type, but the shape is different. Thus, the bricks 10 and 12 are all arranged so as to face the center line of the rotary furnace 1.

The vicinity of the projection 7 and the slag discharge port 8
For the sake of manufacturing, it is formed only of the injection material 11, and the I, V or Y-shaped anchor 13 (outer plate welding) of stainless steel is buried in the inner thickness portion to secure mechanical and thermal strength.

The outside of the rotary furnace 1 is covered with a stainless steel outer plate 14.

The mounting condition of the A-type hanger brick 10 is shown in FIGS. That is, mounting hardware 15 and 16 are arranged and welded to the inner surface of the outer plate 14 in an upright manner, and a prism-shaped A-shaped hanger brick 10 having a substantially square cross section is inserted with the pins 17 inserted therebetween (FIG. 5). (Solid line)
At this time, as shown by a dotted line in FIG. 5, the pin 17 is slightly shifted to the left side, and is slid from the side (rear side of the paper) to the front through the slit hole 18 of the hardware 15, and then pushed to the right, and the right metal 16 Into the hole 19 to prevent interference with the adjacent part. The brick 10 has a recess 20 in the middle of the prism in advance.
Is formed, and measures such as retaining during injection bonding are taken.

As shown in FIGS. 6 and 7, the B-shaped hanger brick 12 is mounted between the mounting hardware 21 and 22 welded to the outer plate 14 with a pin 23 and having a rectangular cross section with a rectangular cross section. Is inserted and attached. In the brick 12,
Two concave portions 24 are provided on the surface on the short side.

The installation of bricks described above is all performed within a cylindrical body and a cone, and the work involves difficulties.
This is dealt with by the method shown in FIG.

That is, the outer plate 14 is developed, and each is separated into a flat plate piece, and a rectangular cylindrical piece 25 and a sector-shaped first conical piece 2 are formed.
6, rectangular first opening piece 27, sector-shaped second conical piece 28 and rectangular square opening piece 29, after melting the above-mentioned mounting hardware, round each plate piece inward, When the bricks of A and B are mounted, the mounting operation is facilitated.

In FIG. 8, a hole 30 of the second conical piece 28 is for mounting a portion serving as an outer plate of the slag discharge port 8.

A core (at least three separate assembling cores) corresponding to the cavity 31 of FIG. 1 is inserted into the center of the brick attachment body, and after assembling into a matrix, the injection material 11 is opened at the left and right openings. Injection from such as will cause the injected material to fill the space between the bricks and join them together. After release, the separated outer plates are integrated at the separated portion by welding or the like.

In the rotary furnace 1 having the refractory structure configured as described above, the ash of the raw material supplied from the first opening 2 at the right end (FIG. 1) is slowly cooled by the burner heat supplied from the opening. During the rotation, the material is melted by the high-temperature furnace wall 9. The molten ash accumulates as a melt 32 at the bottom of the furnace wall 9. When the accumulated amount of the melt 32 reaches a predetermined amount, the rotary furnace 1 is tilted to the left to be discharged from the slag discharge port 8 beyond the protrusion 7.

Most of the furnace wall 9, which is heated to a high temperature, is made of an A-type heat-resistant and fire-resistant hanger brick 10, and its arrangement direction, that is, the direction of the prismatic portion of the brick is the same as the direction of heat flow. Because it has a radial direction, it has a thermal insulation function that prevents heat dissipation in the furnace, and occupies most of the area of the furnace wall surface at the bottom of the brick, so that the heat resistance as a furnace,
It will act as a fireproof.

[0023]

According to the present invention, it is possible to provide a rotary furnace, which is a main element of the ash melting facility, that is, a rotary furnace capable of sufficiently exhibiting fire resistance, and to provide a high-performance and inexpensive rotary furnace. It works.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a rotary furnace according to the present invention.

FIG. 2 is a partial sectional view taken along line II-II of FIG.

FIG. 3 is a partially cutaway front view showing an assembled state of the A-type hanger brick;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a perspective view showing an assembling method of the one shown in FIG. 3;

FIG. 6 is a partially cutaway front view showing an assembled state of a B-type hanger brick;

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a front view of a plurality of divided pieces of a rotary furnace outer plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary furnace 2 1st opening part (right end) 3 1st conical part 4 Cylindrical part 5 2nd conical part 6 2nd opening 7 Projection 8 Slag discharge port 9 Furnace wall 10 A-shaped hanger brick 11 Space and pouring material 12 B-type hanger brick 13 anchor 14 outer plate 15 mounting hardware 16 mounting hardware 17 pin 18 slit hole 19 hole 20 recess 21 mounting hardware 22 mounting hardware 23 pin 24 recess 25 cylindrical piece 26 first conical piece 27 first opening piece 28 Second conical piece 29 Second opening piece 30 Hole 31 Cavity 32 Melt

Claims (1)

[Claims] 1. A method in which a furnace wall of a rotary furnace is joined to a number of prism-shaped hanger bricks arranged circumferentially and longitudinally so as to face a rotation center line and by filling gaps between these bricks. A cylindrical rotary furnace characterized by comprising an injected injection material.