JP2598446Y2 - Outlet weir brick in ash melting furnace - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tailgate brick in an ash melting furnace. For example, ash melting furnaces are used to treat municipal solid waste incineration ash. In the ash melting furnace, the ash is heated and melted,
After discharging the molten slag from the slag port, it solidifies,
Weir bricks are fitted into the outlet. The present invention relates to the improvement of the outlet brick.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned tailgate weir brick, an integrally molded product having a substantially concave cross-section having a central portion formed lower than both side portions has been used. However, such a conventional outlet brick has a drawback that it is difficult to press-mold it in shape and is therefore formed by hand, so that it has poor denseness and is easily eroded by molten slag. In particular, due to its nature, erosion is severe in the central part formed lower than on both sides. Further, since a bending moment acts due to the thermal expansion of the surrounding furnace body, there is a disadvantage that a crack is easily formed in the central portion. If molten slag enters this crack, it will be damaged in a short time. In addition, there is a risk of cracking out or falling off. Conventional tailgate bricks have a short service life, which often forces cumbersome bulk replacement operations.

[0003]

The problem to be solved by the present invention is that the service life of the conventional tailgate brick is short.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a tailgate brick in an ash melting furnace in which a central portion is formed lower than both sides, and one low-level portion constituting the central portion is provided. It is formed of a total of three bricks, a brick and one high-order brick, which is joined to each of the two high-side bricks, and the low-order brick protrudes outward from the high-order brick. The present invention relates to a tailgate brick in a ash melting furnace.

[0005] The tailgate brick according to the present invention has a central portion formed at a lower level than both side portions, and a single lower portion brick constituting the central portion is joined to the lower portion brick to form both side portions. It is formed of a total of three bricks with one high-order brick. The outlet brick is generally formed to have a substantially concave cross section. And the lower part brick which comprises a center part protrudes outside rather than the higher part brick which comprises both sides. The lower brick in the center protrudes in the molten slag discharge direction more than the higher brick on both sides.

[0006]

[Function] A total of three bricks composing the slag outlet weir brick are easier to press-form in shape than in the case where a large brick is integrally formed as in the prior art, and therefore have excellent denseness. It is less susceptible to erosion by molten slag as compared to the conventional tailgate weir brick. Also, due to its structure, the central lower brick is more susceptible to erosion than the higher bricks on both sides, and particularly the outer end of the lower brick is eroded. Protrude outward from the high-order brick. In addition, the tailgate brick is divided into three parts, and the bending moment caused by the thermal expansion of the surrounding furnace body and the thermal stress caused by the temperature difference between the inside and outside of the tailgate brick become difficult to act on the lower middle brick. Also, cracks do not occur in the lower portion brick. Together with these, the tailgate weir brick of the present invention has a long service life.

In order to extend the service life, it is effective in nature to protect or reinforce the lower-level brick, which is most susceptible to erosion. In order to protect this, at least the lower face of the lower-level brick is protected. It is preferable to install a coolable metal case to keep the temperature at low temperature, and it is preferable to use Al ₂ O ₃ —SiC—C-based bricks in order to strengthen the lower part brick from the viewpoint of the material. This brick has characteristics of being dense and having excellent corrosion resistance.

[0008]

FIG. 1 is a front view showing one embodiment of the present invention, FIG.
FIG. 2 is a plan view showing the same embodiment as FIG. In the tailgate weir brick 10, the central portion is formed at a lower level than the both sides, and one low-level brick 11 constituting the central portion and one higher-level brick constituting both sides joined thereto. Part brick 21,
31 and a total of three bricks. The high-side bricks 21 and 31 having a flat trapezoid and a rectangular parallelepiped are sandwiched between the low bricks 11 having a rectangular parallelepiped shape, and the high bricks 21 and 31 having a rectangular parallelepiped shape are arranged in contrast.
On the left side surface 11a of the lower part brick 11, the lower right side surface 21a of the higher part brick 21 and on the right side surface 1 of the lower part brick 11
1b, the lower left side surface 31a of the high-order brick 31 is respectively joined, and the upper right side surface 21b of the high-order brick 21
The upper left side surface 31b of the high-order brick 31 is formed as an inclined surface descending toward the low-order brick 11. The outlet brick 10 is formed to have a substantially concave cross section as a whole.

[0009] The lower brick 11 constituting the central portion
Are protruded outward from the higher-order bricks 21 and 31 constituting both side portions. In FIG. 2, the upper part is the inside of the furnace and the lower part is the outside of the furnace.
1 protrudes in the molten slag discharge direction from the high-order bricks 21 and 31 on both sides.

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention. The interrelationship between one lower brick 12 constituting the central part and one higher brick 22, 32 which is joined to the lower brick 12 to form both sides is shown in FIG. 1 and FIG. Although it is almost the same as the case of the brick 10, in the tailgate weir brick 20 shown in FIG. 3, the entire lower surface of the lower portion brick 12 constituting the central portion and the higher portion bricks 22, 32 constituting the both side portions. A metal case 41 that cools the inside is provided over a part of the lower surface.

Although not shown in the drawings, the tailgate weir brick 10,
Numeral 20 is held by a refractory material such as a brick or an auxiliary brick which forms a furnace body in a state where these are fitted into a slag port of an ash melting furnace.

[0012]

As is apparent from the above description, the present invention described above has an effect that the service life is long, and more specifically, the service life is three times or more as long as that of the conventional integrally molded article.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view showing the same embodiment as FIG. 1;

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.

[Explanation of symbols]

10,20 ・ ・ ・ Sink outlet weir brick, 11,12 ・ ・ ・ Lower part brick, 21,22,31,32 ・ ・ ・ Higher part brick, 41 ・ ・ ・ Metal case

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 4-92125 (JP, U) Japanese Utility Model 5-27596 (JP, U) Japanese Utility Model 5-34422 (JP, U) Japanese Utility Model No. 1 61531 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23J 1/08 F27D 1/04

Claims (3)

(57) [Scope of request for utility model registration] 1. A center portion is formed lower than both side portions.
A tapping port weir bricks in ash melting furnace, structure to the central portion
One low-level brick to be formed and joined to it to form both sides
A smelting port in an ash melting furnace, wherein the smelting furnace is formed of a total of three bricks, each of which comprises one high-order brick, wherein the low-order brick projects outside the high-order brick. Weir brick. 2. A tailgate brick in an ash melting furnace according to claim 1, wherein a coolable metal case is provided on at least a lower surface of the lower portion brick. 3. A low portion bricks Al ₂ O ₃ -SiC-C-based brick a tapping port weir bricks in ash melting furnace according to claim 1 or 2, wherein the.