JPH074465Y2 - Side wall structure of molten slag heating furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a side wall structure of a molten slag heating furnace used when treating molten slag for the purpose of producing rock wool and the like.

[Conventional technology]

Attention has been paid to a rock wool manufacturing method in which a large amount of molten slag generated from a blast furnace is put into a heating furnace such as an electric furnace in a molten state to reduce energy consumption (Japanese Patent Laid-Open No. 59-189282). , JP-A-59-189284, etc.).

FIG. 7 shows an example of a conventional electric furnace. This electric furnace 1 has a closed structure in order to maintain an inert atmosphere in the furnace, and an upper ceiling wall 2, a side inner wall 3 and a lower furnace bottom wall 4 which constitute the furnace inner wall surface are All are made of refractory bricks. And, a raw material charging port 5 for charging the molten slag discharged from the blast furnace, an electrode inserting port 6, and other silica stone charging ports and exhaust gas holes (not shown) are formed in the upper part. In addition, a tap hole 7 for taking out the slag solution whose composition has been adjusted by silica stone or the like is provided on the side opposite to the raw material charging port 5, and on the opposite side of the tap hole 7, hot metal removal is performed. The structure has a mouth 8.

Therefore, the molten slag discharged from the blast furnace is conveyed to the electric furnace by a ladle car or the like, and is charged into the soot electric furnace 1 by a predetermined amount from the raw material charging port 5. In the furnace, the components are adjusted by silica stone or the like while being heated, and the tilting device (not shown) equipped in the electric furnace 1 tilts the tapping machine 7 from the tapping port 7 of the electric furnace 1 toward the tapping port 7 side. (Not shown). On the other hand, the molten pig iron contained in the molten slag is separated and deposited on the furnace bottom wall 4, but is discharged from the pig iron outlet 8 by tilting the electric furnace 1 in the direction opposite to the above. .

[Problems to be solved by the device]

By the way, when the molten slag is thrown into the raw material feeding port 5 from the ladle truck, the molten slag is dropped directly into the raw material feeding port 5 by inclining the ladle truck, but the dropping speed of the molten slag is high and the molten slag is conveyed. In the meantime, the molten slag cools down to some extent, so that the molten slag vigorously rushes into the slag solution remaining in the furnace and sunk into the solution. Then, there is a risk of hitting the bottom wall 4 of the furnace and wrapping around to the hot water outlet 7 side, short-passing without being subjected to sufficient component adjustment and heating, and being discharged directly from the hot water outlet 7 to the cotton maker.

Therefore, the technical problem of the present invention is to uniformly disperse the molten slag of the raw material dropped from the ladle car in the slag solution in the furnace to prevent a short pass to the tap hole.

[Means for Solving the Problems]

In order to solve the above technical problems, the present invention is directed to a closed type molten slag heating furnace having a raw material inlet on the upper side and a tap hole on the side. The means is a side wall structure of a molten slag heating furnace provided with a separating ridge protruding from the inner side wall into the furnace and having an inclined surface toward the furnace bottom.

[Action]

According to the above-mentioned means, the molten slag charged into the furnace from the raw material charging port hits the separating ridge after falling into the residual slag solution, and is uniformly distributed in the solution in the process of flowing along the inclined surface of the separating ridge. As it disperses, the speed at the time of falling gradually decreases while flowing on the inclined surface, and the amount of short-path around the tap hole side is reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of a side wall structure of a molten slag heating furnace according to the present invention. This molten slag heating furnace is basically composed of an electric furnace 1 of a closed container type having the same structure as a conventional one, and has an upper ceiling wall 2, a side inner wall 3 and a lower furnace bottom wall 4. Are formed by refractory bricks, and the upper part has a raw material input port 5 for inputting molten slag, an electrode insertion port 6, and other silica stone input ports and exhaust gas holes (not shown). Is formed, and a tap hole 7 is formed on the side opposite to the raw material inlet 5.
Further, the structure is such that a hot metal outlet 8 is provided on the opposite side of the tap hole 7.

And, in this embodiment, unlike the conventional electric furnace, a liquid separating ridge 10 protruding from the inner wall 3 into the furnace is provided below the raw material charging port 5. As shown in FIG. 1 to FIG. 4, the separating ridge 10 is obliquely downward from the substantially central height position of the inner wall 3 corresponding to the lower position of the raw material inlet 5 toward the substantially central portion of the furnace bottom. Is formed in a mountain shape, and inclined side surfaces 12a, 12b inclined downward on both sides of the inclined front surface 11 are formed in a mountain shape, and these inclined surfaces 11, 12a, 12b are located just below the raw material charging port 5. Is configured as follows. Further, a passage 14 communicating with the hot metal outlet 8 is formed at a lower portion of the tip of each of the inclined surfaces 11, 12a and 12b, following the inwardly facing inclined surface 13.
The separating ridge 10 having such a structure may be formed by projecting a part of the refractory brick forming the inner side wall 3 of the relevant portion as in this embodiment, or forming the inner side wall 3. It may be provided separately from the refractory bricks.

Next, the case where the molten slag is heated by the electric furnace 1 having the above-described structure will be described with reference to FIG. First, the molten slag discharged from the blast furnace is placed on a ladle car and conveyed to the electric furnace 1, and the ladle car is tilted to directly inject a predetermined amount of molten slag into the furnace from the raw material charging port 5. The molten slag dropped in the furnace plunges into the remaining slag solution 15 and sinks, but immediately hits the separating ridge 10 provided directly below the raw material charging port 5, and the inclined front surface 11 and the inclined side surfaces on both sides. The slag solution 15 is uniformly dispersed in the slag solution 15 because the slag solution 15 is divided into three directions and flows on each inclined surface. Further, since the speed at the time of charging is lost by flowing down the inclined surface, the amount of the raw material molten slag immediately after being charged into the slag solution 15 also becomes extremely small, and the short path of the molten slag becomes effective. It can be prevented. In addition, in this embodiment, since the liquid separating ridge 10 is projected to a very small part of the inner side wall 3, it hardly affects the throughput of the molten slag.

FIGS. 5 and 6 show a second embodiment of the present invention. In addition to the separating ridge 10, a structure in which a diametrical step portion 16 is provided in the substantially central portion of the furnace bottom wall 4 is provided. Has become. This step
Reference numeral 16 denotes a furnace bottom wall 4 on the tap hole 7 side which is formed about 15 cm higher than the position of the furnace bottom wall 4 on the raw material charging port 5 side. As shown in FIG. It is constructed by laying two types of refractory bricks 17a, 17b of different types.

It should be noted that the position of the step portion 16 does not necessarily have to be the central portion of the furnace bottom wall 4 as in the above-described embodiment, but may be any position from the position corresponding to the raw material inlet 5 to the tap hole 7 It may be any of the four locations.

Further, the shape of the step portion 16 does not have to be a straight line in the diametrical direction as shown in FIG.
Alternatively, it may be partially provided on a line connecting the raw material charging port 5 and the tap hole 7. Further, the height of the step portion 16 is the electric furnace 1
The optimum size varies depending on the size and shape of the furnace, but at least the height at which the raw material molten slag immediately after turning around from the furnace bottom wall 4 to the tap hole 7 side is applied to the vertical wall 18 of the step portion 16 to block withering during that time If there is

Therefore, when the molten slag is heated by using the electric furnace 1 having such a configuration, the molten slag flows through the inclined surfaces 11, 12a, 12b of the liquid separating ridge 10 and the slag solution 15 as described above.
Although it is efficiently dispersed inside, for some molten slag that reaches the bottom wall 4 of the furnace and wraps around to the tap hole 7 side, the flow is blocked by hitting the vertical wall 18 of the step portion 16 to block the flow. The dispersion rate can be increased by preventing the path and changing the flow upward.

As described above, in this embodiment, the molten slag dropped from the raw material charging port 5 into the furnace is prevented from flowing into the tap hole 7 in two steps, so that the short path to the tap port 7 is more reliably performed. Will be prevented.

〔effect〕

As described above, according to the side wall structure of the molten slag heating furnace according to the present invention, the liquid separating ridge protruding from the inner side wall is provided below the raw material charging port, and the molten slag dropped from the raw material charging port is separated. Since it is applied to the inclined surface of the liquid ridge, it is easy to disperse in the slag solution, and the short pass to the tap hole is prevented, so that the heating of the molten slag and the component adjustment are sufficiently performed. Therefore, high quality rock wool or the like can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the internal structure of a molten slag heating furnace to which the present invention is applied, FIG. 2 is a perspective view of a liquid separating ridge, and FIG. 3 is a case where the liquid separating ridge is viewed from the direction A of FIG. FIG. 4, FIG. 4 is a view of the separating ridge viewed from the direction B in FIG. 2, FIG. 5 is an explanatory view of the molten slag heating furnace showing the second embodiment of the present invention, and FIG. FIG. 5 is an explanatory view of the molten slag heating furnace as seen from above, and FIG. 7 is an explanatory view showing the internal structure of a conventional molten slag heating furnace. DESCRIPTION OF SYMBOLS 1 ... Electric furnace (molten slag heating furnace) 3 ... Inner side wall 5 ... Raw material input port 7 ... Outlet port 10 ... Separation ridge 11 ... Inclined front surface 12a, 12b ... Inclined side surface

Continued Front Page (72) Inventor Shuichi Toya 1331-2-627 Sannai, Kimitsu-shi, Chiba Prefecture (72) Takashi Yumura 1-14-4-103 Kiyomitaiminami Kisarazu-shi, Chiba Inventor Mitsumasa Totaka Fukuoka 59 Nittetsu Plant Design Co., Ltd., 46 Nakahara, Tobata-ku, Kitakyushu, Japan (56) References: Reactor Sho 63-57496 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A closed-type molten slag heating furnace having a raw material inlet at an upper part and a tap hole on a side portion, and a projecting portion into the furnace from an inner wall of the side portion at a position below the raw material inlet. A side wall structure of a molten slag heating furnace, characterized in that a separating ridge having an inclined surface toward the furnace bottom is provided.