JPH08283808A - Main iron trough for blast furnace - Google Patents

Abstract

PURPOSE: To eliminate refractory demolishment and laying work of connecting parts by arranging gaps in the height direction in each of connecting parts between an iron tapping hole and a main iron trough for blast furnace, between the main iron trough for blast furnace and a molten iron trough and between the main iron trough for blast furnace and a molten slag trough. CONSTITUTION: The main iron trough 3 for blast furnace is traveled on rails 11 arranged on a casting floor. In the main iron trough 3, the gaps with steps are arranged from this trough to the iron tapping hole 2, to the molten iron trough, and to the molten slag trough, respectively. The main iron trough 3 has wheels 10 and a driving device 12 and can be driven on the rails 11. The trough 3 whose refractory is to be exchanged due to the damage, is shifted in the reverse direction to the blast furnace 1 with a driving device 12 after beforehand pulling out a cylinder 13 for fixing to the casting floor from a recessed part 14 of the trough 3 and exchanged for a spare main iron trough after repairing it with an exchanging device and the repaired trough is fixed. By this constitution, the exchanging time for the spare main iron trough can drastically be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace gutter for facilitating replacement of a spare gutter that has been repaired in a blast furnace in a short time.

[0002]

As is well known, hot metal and slag stored in a blast furnace pass through a large gutter, a hot metal gutter, and a slag gutter from a taphole. Generally, large gutters, hot metal gutters, and molten slag gutters are fixedly installed on the casting floor. The joints between the taphole and the blast furnace molten gutter, between the blast furnace large gutter and the molten iron gutter, and between the blast furnace large gutter and the molten iron gutter are covered with refractory to prevent the melt from flowing out. The refractory built in the gutter is damaged by the hot metal and slag, and is usually repaired in about 2 weeks. The repair takes about 1 week, during which the tap hole is closed.

Therefore, a set of a taphole, a large gutter, a hot metal gutter, a molten metal gutter, etc. is required for repair. Usually, 2 sets are used for tapping work, but medium and large blast furnaces have 3 or 4 sets. It is common to repair large gutters for blast furnaces without moving the gutters at a fixed location of the taphole. On the other hand, as shown in Japanese Patent Application Laid-Open No. 55-58580, there is also a method of using a hoisting device at another place. When moving, refractory construction of the joint between the taphole and the blast furnace gutter, between the blast furnace gutter and the molten iron gutter, and between the blast furnace gutter and the molten slag gutter and refractory construction of the joint after repair Carry out.

However, the above method has the following problems. (1) It was necessary to suspend the taphole for repairing the blast furnace gutter, and more sets of tapholes, gutters, hot metal gutters, slag gutters, etc. were needed. (2) Even if a spare gutter is installed and quick replacement work is performed, it is necessary to dismantle and install refractory materials at the joint between the taphole and the gutter, between the gutter and the molten gutter, and between the gutter and the molten gutter. It was impossible to shorten the gutter replacement time, and it was necessary to set more tap holes, large gutters, molten iron gutters, and molten slag gutters than necessary. An object of the present invention is to provide a blast furnace gutter for advantageously solving the above problems.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a large gutter and associated equipment which can advantageously solve the aforementioned problems. MEANS TO SOLVE THE PROBLEM this invention solves the above-mentioned subject. (1) The movable gutter for blast furnaces which has a fixing mechanism, the connection part of a taphole and a blast furnace gutter, and the connection part of a blast furnace gutter and a hot metal gutter. The blast furnace gutter is characterized in that a gap in the height direction is provided at a connection portion between the blast furnace gutter and the molten slag gutter, and the blast furnace gutter is installed on the casting floor. (2) In (1), the gutter for blast furnace has a wheel movable horizontally on the casting floor. (3) In (1) and (2), hanging hook attachment parts that can move the blast furnace gutter upward are provided on both sides of the blast furnace gutter.
It is characterized in that at least two portions are provided.

[0006]

The blast furnace gutter of the present invention has a movable mechanism, that is, a drive mechanism such as a wheel, a motor and a chain drive, or has a hanging hook attachment portion, and further, the blast furnace gutter installed on the casting floor is raised and lowered. It has a recess on the side or bottom where the tip of a possible cylinder can be inserted, or it has a mechanism such as a snap-on fixation.

The blast furnace large gutter of the present invention receives molten iron and slag into the large gutter in the shape of stepped gaps inserted in the lower part of the taphole, and the outlet of the large gutter is the same as the taphole. , A step shape having a gap protruding above the molten metal gutter, and a step shape having a gap protruding above the hot metal gutter of the large gutter.

Conventionally, it was necessary to connect refractory between the blast furnace molten gutter and the taphole, the molten iron gutter, and the molten slag gutter because it was difficult to prevent the melt from leaking from the joint. The blast furnace gutter of the present invention has a step structure with a gap between the blast furnace gutter and the taphole, the molten pig iron gutter and the molten slag gutter, and the taphole, the hot metal gutter spout, and the molten slag gutter located above the step By taking measures against radiant heat, the connection part is prevented from being deformed by radiant heat and quick replacement is possible.

The blast furnace molten gutter of the present invention has a movable mechanism, that is, a drive mechanism such as a wheel and a motor, a chain drive, etc., and can be moved on the casting floor to be easily replaced with a preliminary large gutter. The moving mechanism can also be a system that uses a crane. At least two hanging hook attachment parts that can be moved above the gutter are provided on both sides of the blast furnace gutter, and the crane can be replaced with a spare gutter. it can. Since the movable blast furnace gutter of the present invention has no connection between the taphole, the hot metal gutter, and the molten slag gutter, the gutter can be quickly replaced, and various effects such as reducing the number of tapholes can be achieved. Can enjoy.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 4 and 5 are an elevation view and a plan view showing a comparative example of a conventional blast furnace A having a fixed type large gutter. Blast furnace 1 tap hole 2
The hot metal and slag that flow out further pass through the blast furnace molten metal gutter 3 and flow into the molten metal gutter 4 or the molten metal gutter 5. The large gutter 3 is fixedly installed on the casting floor, and has a connection part 6 with the tap hole, a connection part 7 with the hot metal gutter 4 and a connection part 8 with the molten slag gutter 4, and it is constructed of refractory material. There is.

The large gutter having this structure is a fixed type,
At the time of repairing worn refractories, the exit was stopped and repaired. The rest period was one week. Normally, the tap iron of blast furnace 1 is 2
Books are alternated at approximately 3 hour intervals. Therefore, three tap holes are required for the blast furnace 1, and two tap holes 2 are always used, and a cycle of repairing one tap is taken. FIG. 6 shows a conventional comparative example having a replaceable blast furnace gutter 3 B
Although the blast furnace large gutter 3 which is an example of a blast furnace is replaceable, it has a connecting portion 6 with the taphole 2, a connecting portion 7 with the hot metal spout 4, and a connecting portion with the molten slag 5.

In the step of exchanging the gutter of this structure, after the tapping is completed, the hot metal remaining in the gutter 3 is removed and cooled by sprinkling water.
Connection part 6 with taphole 2, connection part 7 with hot metal gutter 4, and molten metal gutter 5
Dismantling of connection part 8 with, wiring for transportation by crane, unloading with crane, transportation of gutter after repair with crane, installation, connection part 6 with tap hole 2, connection part with hot metal spout 4 7 and the connection portion 8 with the molten slag gutter 5 need refractory construction, and refractory drying after construction is required, and the process requires 12 hours or more. Since it is not possible to constantly perform continuous tapping with one tap in a medium or large blast furnace, three taps were prepared.

FIG. 1 is an example of a C blast furnace having a large gutter of the present invention. FIG. 2 shows a plan layout of the gutter of the present invention. Since the large gutter 3 travels on the rail 11 installed on the casting floor, the hot metal gutter 4 is installed in a direction orthogonal to the large gutter 3. The large gutter 3 is provided with a gap between the tap hole 2, the molten metal gutter 4 and the molten metal gutter 5 with a step. The large gutter 3 has wheels 10 and a driving device 12, and can run on a rail 11. For the gutter 3 in which the refractory has worn out and needs to be replaced, the cylinder 13 for fixing the casting floor 9 is pulled out from the recess 14 provided in the gutter 3 in advance, and then moved by the drive device 12 in the direction opposite to the blast furnace to replace it. The spare gutter after repairing is replaced by a device, the spare gutter after repairing is installed at a predetermined position in the immediate vicinity of the blast furnace, and the fixing cylinder 13 is inserted into the gutter recess 14 and fixed. The time required for this period is about 120 minutes, and since it was possible to replace the tap time at another tap hole 2 in about 180 minutes or less, it was possible to reduce the tap holes from 3 to 2 by taking the opportunity of renovation. It was

FIG. 3 is an example of a D blast furnace having a large gutter of the present invention. The large gutter 3 had a gap between the tap hole, the hot metal gutter, and the molten metal gutter, and was replaced by a crane. That is, the hook mounting portion 16 provided on the gutter 3 is attached to the hanging wire 17
It was hung from the crane hook 15 and replaced. The time required was about 140 minutes, and this blast furnace could be upgraded from 3 to 2 tap holes on the occasion of renovation.

[0015]

The blast furnace gutter of the present invention has the following effects. 1. It is possible to eliminate the work of dismantling and refracting refractory materials at the joint between the large gutter and the taphole, the large gutter and the hot metal gutter, and the large gutter and the molten metal gutter to replace the large gutter. 2. The replacement time with the spare gutter can be greatly shortened. 3. By having a spare gutter, it is possible to repair a gutter without stopping the tap hole. 4. The number of tap holes can be reduced during blast furnace refurbishment and new blast furnace installation. Large gutters, hot metal gutters, smelt gutters, tap hole opening machines, mud guns, oxygen opening machines, hot metal tilting gutters, molten slag tilting It is possible to reduce various equipment costs such as gutter, molten iron tilting gutter monitoring camera, and molten metal tilting gutter monitoring camera. There was a great effect such as.

[Brief description of drawings]

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

FIG. 2 is a plan view showing one embodiment of the present invention.

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

FIG. 4 is a side view showing an example of a conventional large gutter.

FIG. 5 is a plan view showing an example of a conventional large gutter.

FIG. 6 is a side view showing another example of a conventional large gutter.

[Explanation of symbols]

 1 blast furnace main body 2 taphole 3 gutter for blast furnace 4 hot metal gutter 5 ladle gutter 6 connection between taphole and gutter 7 connection between big gutter and hot metal gutter 8 connection between big gutter and molten gutter 9 10 Wheels 11 Rails 12 Gutter Drive Device 13 Cylinders for Fixing 14 Recesses 15 Crane Hooks 16 Hook Attachments 17 Wires for Lifting 18 Skinmers

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Nakamori, 1 Kimitsu, Kimitsu City, Chiba Prefecture, Nippon Steel Co., Ltd. Kimitsu Steel Co., Ltd. Nippon Steel Corporation Machinery & Plant Division

Claims (3)

[Claims] Claim: What is claimed is: 1. A movable blast furnace gutter having a fixing mechanism, a connection part between a taphole and a blast furnace gutter, a connection part between a blast furnace gutter and a molten iron gutter, and a blast furnace gutter and a molten gutter. A gutter for a blast furnace, which is installed on the casting floor with a gap in the height direction at the joint part of. 2. The blast furnace gutter according to claim 1, wherein the blast furnace gutter has wheels that can move horizontally on the casting floor. 3. A blast furnace gutter according to claim 1, wherein at least two hanging hook attachment portions for moving the blast furnace gutter upward are provided on both sides of the blast furnace gutter. .