JPH0336515Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drainage structure for an irregularly shaped lining part of a blast furnace.

When a blast furnace is newly constructed or renovated, the lining is subjected to a drying process to remove moisture contained in the lining before operation.

Most conventional blast furnace linings are brick linings, but in this case, the moisture contained in the lining is due to the moisture in the refractory mortar used for brickwork, and this is a small amount of about 1%. Even when amorphous lining containing a large amount of water is used, the amount of amorphous lining used is small, so the overall moisture content is small, and dewatering during the drying process takes about 10 days. I was able to do it without any problems.

However, when irregular-shaped linings are used in earnest as blast furnace linings, the lining thickness becomes
The length is over 600mm, and the amount used is several hundred tons, so the moisture content in this varies depending on the quality of the irregular lining, but it is 5 to 10%, and the amount reaches several tens of tons. . Due to the thick lining and large moisture content, the drying process requires a considerably long period of time (one month or more) depending on the normal method. In addition, the moisture in the lining moves to both the inside of the furnace and the steel shell side and undergoes a dehydration process, but the moisture that moves to the steel shell side becomes drain water and drains into the refractory located at the bottom of the irregular lining section. Since moisture infiltration into the brick lining (hereinafter referred to as the lower brick lining) has an adverse effect and it is quite difficult to completely dehydrate it, it is desirable to shorten the drying period and completely dehydrate it. was.

The present invention solves the problems of drying the irregular shaped lining by the conventional method, facilitates the discharge of water or steam that moves to the shell side during drying and dehydrates it, and shortens the lining drying period. An object of the present invention is to provide a water draining structure for an irregularly shaped blast furnace lining part that prevents moisture from entering the lower brick lining and enables sufficient drying.

The water drainage structure of the irregularly shaped blast furnace lining of the present invention is suitable for blast furnaces using irregularly shaped linings.
A drainage hole is provided at the bottom of the blast furnace shell of the irregular-shaped lining or the cooling box nozzle attached to the shell, and a draining shell is installed at the boundary between the irregular-shaped lining and the lower brick lining, and the upper surface of the draining iron plate is It is characterized by having drainage holes in the iron shell at certain positions. The details will be explained below based on examples.

FIG. 1 is a cross-sectional view of a blast furnace wall showing an embodiment of the water draining structure of the irregularly shaped blast furnace lining of the present invention. In the figure, 1 is a blast furnace shell, 2 is a cooling box nozzle attached to the blast furnace shell for charging the cooling box, and 3 is a cooling box nozzle for charging the cooling box.
4 is a cooling box, 4 is an irregular lining provided inside the steel shell 1, and 5 is a lower brick lining. 6 is a drain hole, 7 is a socket for the drain hole, 8 is a plug, 9 is a drainage iron plate attached to the boundary between the irregular lining part and the lower brick lining part, and 10 is a fire-resistant shrink material.

In this example, an irregular lining was used entirely on the upper part of the shaft of the blast furnace, and SiC bricks were used as the lining on the lower part of the shaft. Although we used a material with as little moisture as possible for the irregular shaped lining, it still contained about 6% moisture at the time of construction, and since the lining quantity was 300 tons, it required about 18 tons of moisture. was included.

In this embodiment, the drain holes were provided at the lower part of the cooling box nozzle in order to have holes of 10 to 20 mm in diameter and spaced at intervals of 1 to 2 m in the vertical and horizontal directions. A socket and plug were attached to the drain hole to keep it open during drying and to close it off after drying.

A draining iron plate is installed by welding a thin iron plate of about 2 to 3 mm to the steel shell at the boundary between the irregular lining part and the lower brick lining part, and a drain hole of 1 to 2 m is made in the steel shell at the top surface. Holes are drilled at intervals,
I also attached a socket and plug to this.

To absorb the thermal expansion of the lower brick, 10 to 20 mm of fire-resistant shrink material was inserted under the draining iron plate to absorb the expansion.

By inserting a blast furnace into the structure as described above, during drying, when the drying hot air temperature reaches around 200 to 300℃, drain water starts to be discharged from each drain hole to the outside of the furnace, and as the hot air temperature rises, the amount of drain water increases. The drying period was significantly shortened and could be completed in 20 days because the water was increased and dehydration was easily carried out.

In addition, by installing a drainage iron plate, drain water did not intrude into the SiC brick lining at the bottom, and there were no adverse effects such as steam oxidation of the SiC bricks or deterioration of the quality of the mortar.

As mentioned above, even when a large amount of amorphous lining with a high moisture content is used in a blast furnace, by adopting the drainage structure of the present invention, it is possible to shorten the drying period and completely dehydrate the water. It is now possible to prevent the generated drain water from having an adverse effect on the lower brick lining. This opens the door to the use of large quantities of irregularly shaped linings in place of the conventionally commonly used bricks, and will make it possible to further reduce lining costs, save labor, and mechanize lining work in the future. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a furnace wall showing one embodiment of the water draining structure of the irregularly shaped blast furnace lining of the present invention. 1: Blast furnace shell, 2: Cooling box nozzle, 3: Cooling box, 4: Irregular lining, 5: Lower brick lining, 6: Drain hole, 7: Socket, 8: Plug, 9: Draining shell, 10 : Fireproof shrink material.

Claims (1)

[Scope of utility model registration request] In blast furnaces that use irregularly shaped linings,
A drainage hole with a plug is provided at the bottom of the cooling box nozzle attached to the blast furnace shell of the irregular lining, and a drainage iron plate is installed at the interface between the irregular lining and the lower brick lining, and a fireproof iron plate is installed at the bottom of the drainage iron plate. A drainage structure for an irregularly shaped blast furnace lining part, characterized in that a shrink material is inserted and the drainage hole is provided at a position on the upper surface of a draining iron plate.