JPH085261A - Spray cooling furnace lid - Google Patents

Abstract

PURPOSE:To reduce cost of drainage equipment for a spray cooling type furnace cover of a tilting type furnace body for treating molten metal in a tilting arc furnace, a ladle and the like in the case of tapping or slag removing. CONSTITUTION:A furnace cover 7 covering an upper end opening of a furnace body 1 wherein tapping and slag removing are carried out by tilting forward and backward the furnace body 1 holding therein molten metal is formed into a hollow shape and cooled by spraying a cooling medium in its internal space 8. This spray cooling type furnace cover has a water collecting gutter 13 formed on the outer periphery of the furnace cover 7 and tilted forward at an angle greater than an angle at which the furnace body 1 is tilted backward when slag is removed. A drainage pipe 14 is provided at the lower end of the water collecting gutter 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray cooling type furnace lid in a tilting furnace body for treating molten metal such as an arc furnace, a ladle, etc. that tilts when tapping or slagging.

[0002]

2. Description of the Related Art A furnace lid in a metal melting furnace such as an arc furnace or a ladle or a molten metal processing furnace is, for example, Japanese Patent Publication No. 3-2.
As disclosed in Japanese Patent No. 2559, a steel pipe is formed into a hollow shape, and a cooling medium such as water is sprayed into the space from a spray pipe arranged in the inner space to cool the furnace lid, It is protected from the high heat inside the furnace.

[0003]

By the way, in the case of the conventional spray cooling type furnace lid as described above, at least two drainage ports are provided on the outer periphery of the furnace lid for removing water accumulated in the inner space thereof. However, even when the furnace body is tilted back and forth for tapping or slag removal, it was necessary to allow the cooling medium to drain from any of the drainage ports without any trouble. For this reason, drainage pipes are installed at the front and rear of the furnace lid, and
In order to perform forced discharge, it is necessary to attach an ejector pump to each drain pipe, which causes a problem of high equipment cost.

[0004]

The spray cooling type furnace lid of the present invention is intended to solve the above-mentioned problems, in which the furnace body holding the molten metal is tilted back and forth to carry out tapping and slag removal, and In a spray-cooling type furnace lid having a hollow furnace lid covering the upper end opening of the furnace body and spraying a cooling medium to cool the inner space of the furnace lid, the rearward inclination angle of the furnace lid on the outer periphery of the furnace lid It is characterized in that a water collecting gutter which is inclined forward at a larger angle is formed, and a drain pipe is provided at a lower end portion of the water collecting gutter.

[0005]

The cooling medium sprayed into the inner space of the furnace lid can always be discharged from the drain pipe through the water collecting trough. Therefore, by providing only one drain pipe, regardless of the tilting condition of the furnace body, discharge can always be performed smoothly.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An arc furnace according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the furnace body 1 in which the molten metal 2 and the slag 3 are held on the inner bottom is supported on the base 4 so as to be tiltable back and forth, and 5 is the tapped steel formed on the front bottom. A mouth, 6 is an opening / closing door for removing sludge provided on the rear wall surface. The furnace body 1 is tilted forward and backward by operating a cylinder (not shown) and is tilted forward by 10 to 15 degrees so that the molten metal 2 can be tapped out from the tapping port 5 and tilted backward by 5 to 10 degrees. As a result, the slag 3 can be discharged from the opening / closing door 6.

Reference numeral 7 denotes a furnace lid which covers an upper end opening of the furnace body 1. The furnace lid 7 is formed in a hollow shape by surrounding upper and lower surfaces and inner and outer peripheral surfaces with steel plates, and a plurality of furnace lids 7 are provided in an inner space 8 thereof. The spray pipes 9 are radially arranged, and the water supply unit 1 is located near the center.
0 is supplied with cooling water as a cooling medium from the outside through a flexible pipe 15, and the cooling water is sprayed into the internal space 8. Reference numeral 11 denotes an electrode that is inserted into the central portion of the furnace lid 7 and hangs down in the furnace body 1.

The outer peripheral portion 12 of the furnace lid 7 is formed in a cylindrical shape so as to be detachably fitted on the outer periphery of the upper opening edge of the furnace body 1. The water collecting trough 13 which is tilted forward is formed at an angle α (that is, 10 degrees or more in this embodiment) which is larger than the tilt angle at the time of sludge. For this reason, the outer peripheral portion 12 is formed deeper toward the front of the furnace body 1 and is fitted more deeply into the upper opening edge of the furnace body 1. A drain pipe 14 is provided at the lower end of the water collecting trough 13 (that is, the front side of the furnace body 1) so that the cooling water accumulated in the water collecting trough 13 can be discharged from the drain pipe 14.

Reference numeral 16 is a cooling water tank, and 17 is the tank 1.
A pump for circulating the cooling water of 6 to the ejector 18, and a pump 19 for pumping the cooling water of the tank 16 to the water supply unit 10 through the flexible pipe 15. The drain pipe 14 is connected to the ejector 18 via a flexible pipe 20.
The cooling water pumped by the pump 17 flows through the ejector 18 at high speed, and the flexible pipe 20 and the drain pipe 14 have a negative pressure so that the drain pipe 14 collects water. The cooling water is vacuum-sucked from the opening end in the gutter 13 so that it can be smoothly collected in the tank 16.

In the spray-cooled furnace lid thus constructed, the water collecting trough 13 is still tilted forward even when the furnace body 1 is tilted backward for removing slag as shown in FIG. The cooling water sprayed from the pipe 9 flows through the water collecting trough 13 and can be discharged from the drain pipe 14. Therefore, the furnace lid 7 can be cooled without any trouble even during the removal of slag, and the cooling water can be smoothly discharged from only one drain pipe 14.

In this embodiment, the ejector 18 is provided so that the cooling water can be sucked in vacuum from the drain pipe 14.
The cooling water may be discharged by its own weight by providing a discharge port (shown in the figure) at the bottom of the water collecting trough 13.

[0012]

As described above, according to the present invention, the cooling medium can be smoothly discharged by one drain pipe regardless of the tilting state of the furnace body, so that the drainage facility can be simplified and the cost can be reduced. effective.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a spray cooling type furnace lid according to the present invention.

FIG. 2 is an operation state diagram of FIG.

[Explanation of symbols]

 1 Furnace body 5 Steel tap 6 Opening / closing door 7 Furnace lid 8 Inner space 9 Spray pipe 10 Water supply section 12 Outer periphery 13 Water collecting trough 14 Drainage pipe

Claims (1)

[Claims] 1. A furnace body for holding molten metal is tilted back and forth to carry out tapping and slag removal, and a furnace lid for covering the upper end opening of the furnace body is formed in a hollow shape to provide a cooling medium in its internal space. In a spray-cooled furnace lid that sprays and cools, a water collecting gutter that is tilted forward at an angle larger than the rear tilt angle when removing the furnace body is formed on the outer peripheral part of the furnace lid, and at the lower end of the water collecting trough. A spray cooling type furnace lid characterized by having a drainage pipe.