JP2000319712A - Water-cooled slag runner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slag runner small in heat deformation and high in safety by providing a metal main member at the bottom of a slag runner, except for its center portion, which is obtained by placing a metal main member located in a recessed portion of a casting bed of a blast furnace and having a flowing portion of a cooling medium as a side wall part and lining the inner peripheral portion of the side wall part with a runner material, and providing a refractory at the center portion. SOLUTION: A refractory 4 such as a quartzite brick is provided in a space (for example, 1/3 of the width of the runner bottom) of a center portion of a runner bottom between L-shaped metal main member 2a, 2b, and an inner peripheral part is lined with a runner material 3 to form a slag runner. Slag adhesion is generated on a side wall portion of the runner material and a corner portion of the runner bottom by passing water on a back side of the metal main members 2a, 2b, the runner material is prevented from being damaged by the self-lining effect, and the service life of the runner is increased by cooling the refractory provided on the center portion of the runner. The wear condition of the whole runner is controlled by the relation to a heat load by a thermometer 13 embedded in the metal main members 2a, 2b, and reduction in thickness of the slag runner is detected by monitoring the wear condition of the refractory layer of the slag runner to prevent steam explosion in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water-cooled slag gutter used in a blast furnace or the like.

[0002]

2. Description of the Related Art In a normal blast furnace operation, hot metal and slag are periodically poured into a tapping gutter from a taphole of a blast furnace, and are separated into hot metal and slag by a skinmer damper of the tapping gutter. You. Hot metal is received by, for example, a torpedo car via a hot metal gutter. On the other hand, the slag flows in the slag gutter branched from the tapping large gutter, is converted into slag by a slag facility, for example, and is carried out via a hot iron pot.

[0003] This slag gutter is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-9570.
As shown in Japanese Patent Publication No. 9, a gutter bottom and side walls of the slag gutter are made of a thick steel main material, a refractory layer formed on the inner surface side of the main material, and a water-cooled cooling pipe provided outside the main material. It had a structure integrally formed with a built-in cooling layer.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 9-957 is disclosed.
In the case of the slag gutter disclosed in JP-A-09-09, a so-called slag deposit layer, on which the slag solidifies and adheres because the operating surface of the refractory layer on the side wall of the thick steel main material is cooled, is formed. It is formed. However, since a small amount of hot metal may be mixed in the slag flowing through the slag gutter, a slag deposit layer is not generated at the bottom of the gutter. This slag deposit exhibits a self-flying effect,
Due to its role as a heat insulating material, the thermal load on the gutter bottom becomes larger than the thermal load on the gutter side wall, and there is a problem that the main material made of thick steel at the gutter bottom is deformed due to the difference in thermal expansion. Was. Also, not only a small amount of hot metal is mixed in the slag, but also a large amount of hot metal may be mixed due to clogging of the skin mer damper. To gather at the bottom of the gutter
The gutter material and the steel plate main material are also quickly melted down, and it is necessary to replace the steel plate main material at the bottom of the slag gutter, and there is a risk of steam explosion. SUMMARY OF THE INVENTION An object of the present invention is to provide a water-cooled slag gutter having a simple structure, less heat deformation, erosion, etc., and high safety.

[0005]

According to the present invention, there is provided a water-cooled slag gutter according to the present invention, which is disposed in a recess formed in a blast furnace cast floor, and has a side wall formed of a metal main material having a cooling medium flowing portion. In the smelter gutter whose inner peripheral portion is lined with a gutter material, a metal main material is provided in a portion of the slag gutter except for a central portion of the gutter bottom, and a refractory is further provided in the central portion. is there.
In the water-cooled slag gutter according to the present invention, at least 1/5 or more of the gutter bottom of the slag gutter, and at most to the side wall side of the gutter material of the inner peripheral portion and below the corner portion on the gutter bottom side. Refractories can be provided. This is because the height of the center of the gutter bottom is lower than that of the side wall of the gutter bottom in order to facilitate the flow of the slag downstream. Therefore, the hot metal contained in the slag flows through the center of the gutter. Like the flow of the river, the hot metal spreads in the width direction of the gutter as it flows downstream, but does not become less than 1/5 of the gutter bottom width even in a normal case. On the other hand, if a large amount of hot metal flows into the slag gutter due to clogging of the skin mer damper or the like, the central portion of the gutter bottom is firstly melted, and the hot metal does not reach the side wall, so that the refractory is contained in the above range. It was installed. Further, in the water-cooled slag gutter according to the present invention, a metal main material that circulates a cooling medium may be arranged below the side wall side of the gutter material on the inner peripheral portion and the corner portion on the gutter bottom side. Further, in the water-cooled slag gutter according to the present invention, a fall-in preventing member for connecting a refractory constituting the recess of the blast furnace cast floor and a side wall of the metal main material of the side wall is provided, and the metal of the side wall is provided. It is also possible to prevent the main material from falling down.
As the refractory at the bottom of the gutter, a refractory brick such as a silica brick can be used.

In the present invention, even when a slag deposit layer is formed on the side wall of the slag gutter, and a difference in heat load occurs between the gutter bottom and the side wall of the slag gutter, compared with the metal main material. By disposing a refractory with much less thermal expansion at the center of the gutter bottom in the width direction, the gutter bottom does not deform. In addition, since the metal main material for flowing the cooling medium is installed on the side walls on both sides of the gutter bottom, the refractory at the center of the gutter bottom is also cooled, and its life can be extended. In addition, when a large amount of hot metal collects at the bottom of the gutter due to clogging of the skinmer damper, etc. Although the refractory is damaged by the disposition, the metal main material is not seriously damaged, the damaged refractory can be easily replaced, and there is no danger of steam explosion.

In addition, since the cooling medium flows through the metal main member extending below the side wall side of the gutter member on the inner peripheral portion and the corner portion on the bottom side of the gutter, the cooling medium flows through the side wall side of the gutter member on the inner peripheral portion. Slag deposits are generated at the corners on the bottom side of the gutters, and not only can the gutter material be prevented from being damaged by the self-learning effect of the deposits, but also by cooling the refractory provided at the central portion. Refractory life is extended.

A sudden and excessive heat load from a large amount of hot metal causes expansion and contraction of the metal main material due to a change in the heat load caused by the difference of whether or not the slag is flowing or clogging of the skin mer damper. A gap is formed between the refractory constituting the recess of the blast furnace cast floor and the side wall of the main metal material of the side wall. Foreign matter such as gutter material scraps at the time of gutter renewal enters the gap, and a phenomenon occurs in which the side wall of the metal main material falls down to the slag side. In order to prevent this phenomenon, a fall prevention member for connecting the refractory constituting the recess of the blast furnace cast floor and the side wall of the metal main material is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIGS. 1A and 1B are sectional views showing a water-cooled slag gutter according to an embodiment of the present invention.
It is a perspective view. As shown in FIG. 1, a water-cooled slag gutter according to an embodiment of the present invention has an L-shaped metal main material 2a, 2b.
Are placed on both sides of the smelter gutter in the recess formed in the blast furnace cast floor,
A refractory 4 such as a silica brick is provided in a central space (1/3 of the width of the gutter bottom) of the gutter bottom between the metal main members 2a and 2b, and the inner periphery thereof is formed by lining with the gutter material 3. Is done. In the present embodiment, the refractory 4 is provided in a range of 1/3 of the gutter bottom width. However, from 1/5 of the gutter bottom width, the side wall side of the gutter material on the inner peripheral portion and the corner portion on the gutter bottom side. The refractory can be provided in a range up to the position below.

A water cooling pipe 1, which is an example of a cooling medium flow section, is provided on the back of the metal main members 2a, 2b. In this arrangement, first, a groove for fixing a water-cooled pipe is created, and a heat-resistant and high-thermal-conductivity material (a graphite-based stamp material having a wavelength of 30 kcal / m · hr · ° C. or more) 5 is poured into the groove. By embedding the pipe 1 and further pouring a heat-resistant and high-thermal-conductivity material 5, the surroundings of the water-cooled pipe 1 are wrapped with the heat-resistant and high-heat-conductivity material 5, and further, the water-cooled pipe holding member 6 is made of a metal main material 2.
The water-cooled pipe 1 and the heat-resistant and high-thermal-conductivity material 5 are fixed by welding to a and b. As described above, the water cooling pipe 1 is structured so as to be wrapped with the heat-resistant and high-thermal-conductivity material 5.
The degree of freedom in expansion and contraction of the water cooling pipe 1 is not only prevented, but also the trouble of cracking of the water cooling pipe can be prevented, and the structure can be simplified.

Water cooling pipes 1 are provided on the back side of the main metal members 2a and 2b arranged on the side wall portions, three each, and the corner portions on the side wall side and the bottom side of the gutter member 3 on the inner peripheral portion. It is provided one by one on the bottom side of the metal main members 2a, 2b arranged below. One of the water-cooling pipes 1 at the bottom of the gutter among the three on the back side, and the water-cooling pipes 1 provided below the side walls of the gutter material 3 at the inner periphery and the corners at the bottom of the gutter. The water flow is such that water is supplied and drained at the upper two on the back side. Furthermore, the blast furnace cast floor refractory 7 in the concave portion constituting the outside of the slag gutter and the metal main material 2
The blast furnace cast floor refractory 7 and the metal main members 2a, 2b are brought into close contact with a fall prevention member 8 connecting the side walls of the metal members 2a, 2b.

Further, as a result of providing the water-cooling pipe 1 on the side wall portions of the metal main members 2a and 2b, the side wall side of the gutter member 3 and the corner below the gutter bottom side, the gutter member 3 on the inner peripheral portion is provided. Cooling is enhanced, and a solidified slag deposit layer 9 that is cooled and solidified is generated on the operating surface of the gutter material 3, and a self-flying effect can be obtained.

The main metal members 2a, 2b are divided into appropriate lengths in the longitudinal direction of the slag gutter, and the water-cooled pipe 1 is provided with metal at each of the divided positions in the longitudinal direction of the main metal members 2a, 2b. Cooling water flows through the water cooling pipes 1 continuously by connecting pipes 10 outside the main materials 2a and 2b. By installing the connecting pipe 10 vertically from the top of the metal main members 2a, 2b, compared to the case where the connecting pipe 10 is installed horizontally on the back of the metal main members 2a, 2b, the side wall back surface of the metal main members 2a, 2b The piping space can be narrowed, which not only strengthens the fixing of the smelter gutter, but also reduces the cost of creating a pit for the communication pipe.

Further, a thermometer 1 on the water supply side of the cooling water of the slag gutter.
1, a measuring instrument 14 for measuring the temperature detected by the drain-side thermometer 12 and the thermometer 13 of the main metal members 2a and 2b,
A computer 15 for calculating the heat load based on the temperature and a monitor 16 for monitoring the temperature and the heat load calculation result are provided. Gutter material suitable for slag gutters (50 mm thick)
In this case, the surface temperature of the slag side of the main material of the gutter wall is changed from 1218 ° C. to 6
About 600 ° C is reduced to 25 ° C. Since the thickness of the gutter material and the drop temperature are in a proportional relationship, the thermometer 1 immediately after the start of use
The temperature of 3 (slag side surface temperature) is 625 ° C, and when this temperature rises to 925 ° C, the temperature drop by the gutter material is about 300 ° C and the thickness of the gutter material is 25 mm. Understand. If the erosion of the gutter material progresses uniformly,
The heat load received from the slag in the slag gutter is doubled. When the heat load of the entire slag gutter is calculated from the supply water temperature and the drainage temperature of the cooling water and the heat load is more than doubled, the gutter needs to be inspected because some parts of the gutter wear rapidly. That is, from the relationship between the temperature of the thermometer 13 embedded in the metal main members 2a and 2b and the thermal load calculated from the temperature of the water supply and drainage, the wear state of the entire gutter can be managed in a tendency. In addition, by monitoring the state of wear of the refractory layer of the slag gutter, it is possible to detect not only that the refractory layer has been melted and thinned by the hot metal mixed into the slag, but also that a steam explosion due to the hot metal has occurred. Can be prevented.

[0015]

The water-cooled slag gutter according to any one of claims 1 to 4 has a simple structure, is less susceptible to heat deformation and erosion, and is a highly safe slag gutter. Renewal work can be reduced, and the effect in this field is great.

[Brief description of the drawings]

FIGS. 1A and 1B are a side sectional view and a perspective view, respectively, showing a water-cooled slag gutter according to an embodiment of the present invention.

[Explanation of symbols]

1: water-cooled piping, 2a, 2b: metal main material, 3: gutter material,
4: refractory, 5: heat-resistant and high-thermal-conductivity material, 6: water-cooled piping retainer, 7: blast furnace cast floor refractory, 8: falling down prevention member,
9: slag deposit layer, 10: connecting pipe, 11: feed water thermometer,
12: waste water thermometer, 13: metal main material thermometer, 14:
Measuring instrument, 15: Computer, 16: Monitor for monitoring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Takahashi 1 Nishinosu, Oita-shi, Oita F-term in Nippon Steel Corporation Oita Works (reference) 4K015 EC02

Claims (4)

[Claims] Claims: 1. A blast furnace cast floor is disposed in a recess formed in a cast floor,
A metal main material having a cooling medium flowing portion is used as a side wall portion, and in a smelter gutter whose inner peripheral portion is lined with a gutter material, a metal main material is added to a portion of the slag gutter except a central portion of a gutter bottom. Provided,
A water-cooled slag gutter, wherein a refractory is provided at the center. 2. The water-cooled slag gutter according to claim 1,
Water-cooling, wherein the refractory is provided at least 1/5 or more of the gutter bottom of the slag gutter, at most up to the side wall side of the gutter material of the inner peripheral portion and below the corner portion on the gutter bottom side. Type slag gutter. 3. The water-cooled smelter gutter according to claim 1, wherein a metal main material that circulates a cooling medium is provided below a side wall side and a gutter bottom side corner of the inner peripheral portion of the gutter material. A water-cooled slag gutter that is arranged. 4. The water-cooled smelter gutter according to claim 1, wherein a refractory constituting a concave portion of the blast furnace cast floor is connected to a side wall of the main metal material of the side wall portion. A water-cooled slag gutter characterized in that a fall-in prevention member is provided to prevent the metal main material on the side wall from falling down.