KR101362562B1 - A eaf roof with spray cooled type - Google Patents

Abstract

An electric furnace loop body that forms a closed hollow cooling space in the shape of a cover, a cooling water supply unit connected to an external water supply pipe for distributing cooling water, and a spray nozzle is assembled at the end to spray cooling water to the entire conical hot plate area. A plurality of injection pipe assemblies, a vacuum drainage portion for discharging the coolant collected and flowed down, a natural drainage portion for discharging the cooling water collected on the opposite side of the inlet of the vacuum drainage portion, and an independent space located on the opposite side of the vacuum drainage portion An injection furnace type electric furnace loop is disclosed, comprising a cooling water filling part separately supplied with cooling water and a slag fixing protrusion attached to an entire area of a conical hot plate.

Description

Furnace roofing with spray cooling method {A EAF ROOF WITH SPRAY COOLED TYPE}

The present invention relates to an electric furnace loop of an injection cooling method, and more particularly, to a cooling method for protecting an electric furnace loop from high temperature heat generated in an electric furnace.

Arc furnace is an electric furnace that melts iron scrap by arc heat generated between electrode and scrap metal by passing electric current through electrode which is electric conductor. After slag oxidation, the slag is scraped out of the furnace, scraped out, and additionally prepared additives are added to make the desired steel, and the furnace is turned to the exit located away from the center of the furnace bottom.

In order to protect the electric furnace and the electric furnace loop from the heat generated in this process over 1000 degrees Celsius, the cooling method by the flow of the cooling water is mainly used.

In this cooling method, pipes are stacked in multiple layers and connected to create a whole wall exposed to heat, and the pipe is cooled by supplying water to the pipe, and a closed passage like a maze for the entire wall exposed to heat. The method of forming and supplying the cooling water by pressurizing and supplying the cooling water as in the above-described method, and the cooling method of spraying the cooling water toward the opposite surface of the iron plate exposed to heat and then immediately discharging the cooling water is used.

The facility including a wall surface composed of a closed passage consisting of waterways such as the labyrinth described above has a corner formed in the inner space through which the coolant passes and the coolant passage is not made smoothly, resulting in a space where the coolant is stagnant. It has risen and eventually caused the wall surface to be damaged by high temperature.

The wall made of pipe has less risk of damage due to the smooth movement of coolant than the wall of the maze structure, but it is a method that presses and pushes the coolant through the entire cooling wall. There was a risk that this would require stopping the operation.

On the other hand, the spray cooling method creates a confined space in which cooling water can be sprayed toward the opposite side of the entire steel plate exposed to heat, so that nozzles are arranged and sprayed and the cooling water is quickly removed to protect the equipment exposed to high temperature and to reduce the amount of cooling water. It is economical because it uses low cooling water supply pressure and can be configured lighter than other cooling methods.

Rapid discharge of coolant is important for spray cooling by nozzle arrangement. When slag exclusion or tapping is performed, the electric furnace is inclined in the working direction, and the electric furnace roof is inclined equally accordingly. Incapacitating situations occur repeatedly in every operation.

In addition, since the furnace roof must be opened and rotated to open the upper part of the furnace completely in order to input the scrap into the furnace, the drain hole of the furnace roof and the pipe connected thereto are limited to be installed only at the far side from the furnace after turning. . In order to solve this problem, conventionally, two jet pumps are installed so that the ejected coolant collected by flowing to a lower place when the furnace roof is inclined in the opposite direction for scrap removal and tapping is discharged by vacuum to the position of the outlet. In order to use the jet pump, the high pressure water for pump driving had to be supplied separately.

In addition, the slag generated during the initial operation is adhered to the roofing iron plate exposed to high temperature to form a film, thereby attaching a projection such as a bolt to the entire exposed iron plate for the effect of directly blocking the high temperature, but the slag film is not easily formed or easily There was a phenomenon of departure.

In order to solve the above problems, the present invention simplifies the drainage structure in the electric furnace roof of the spray cooling method, and allows a slag film to be formed well to prevent direct exposure to high temperature, and gives a cooling effect to the outer wall of the roof. The purpose is to minimize the damage caused by high temperature heat.

The electric furnace loop of the spray cooling method of the present invention for achieving the above object comprises an electric furnace loop body which forms a hollow sealed cooling space in the shape of a cover for blocking high temperature gas and heat generated from the electric furnace from the outside; A cooling water supply unit connected to an external water supply pipe for distributing cooling water to the entire area of the furnace loop body, and a plurality of injection nozzles assembled at the end to spray cooling water to the entire area of the conical hot plate; A vacuum drain portion for sucking and draining the coolant collected by spraying and draining by a vacuum pump, a natural drainage portion for draining the coolant flowed on the opposite side of the inlet of the vacuum drainage portion, and an independent space located on the opposite side of the vacuum drainage portion. And a coolant filling part to which coolant is separately supplied, and the conical hot plate It characterized in that it comprises a slag fixing projection attached to the entire area.

Here, when the electric furnace is horizontal in the furnace roof body, the coolant is discharged simultaneously from the natural drainage unit and the vacuum drainage unit, and when tilted to eliminate slag, the coolant is drained only to the natural drainage unit, and the vacuum is inclined for tapping. In order to discharge the cooling water only through the drainage portion, it is preferable that the position of the vacuum drainage portion of the vacuum drainage portion close to the natural drainage portion and the vacuum drainage inlet on the opposite side are connected to each other by the vacuum drainage passage.

In addition, the coolant filling part is separated from the vacuum drainage passage by two vacuum drain separators, and is directly connected to the coolant distribution pipe by the coolant filling induction pipe to supply and fill the coolant, thereby reducing the coolant filling outlet smaller than the size of the coolant filling induction pipe. It is recommended that the coolant is flowed back into the loop body by electricity.

In addition, the slag fixing protrusion is preferably attached to the entire area of the conical hot iron sheet in an open form toward the center of the loop.

1 is a perspective view showing a pipe panel of a conventional electric furnace loop.
2 is a cross-sectional view showing a conventional jacket type electric furnace loop.
Figure 3 is a perspective view showing an electric furnace loop of the spray cooling method according to an embodiment of the present invention.
4 is a perspective view of the inside of the loop and a detail of the injection pipe assembly;
5 is a bottom perspective view of the loop and a detail view of the slag anchoring protrusion.
6 is a cross-sectional view of a normal drainage of the loop.
Figure 7 is a drain sectional view showing the roof is inclined when the slag is excluded.
8 is a cross-sectional view showing the inclined state of the roof when inclined.
9 is a perspective view, a cross-sectional view, and a detailed view showing a vacuum drainage part, a natural drainage part, and a coolant filling part of the loop.

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

3 to 9, the electric furnace loop 100 of the cooling spray method according to an embodiment of the present invention is a top cover 102, an inner vertical cylindrical iron plate (101) including a conical hot plate 101 and the inspection window 103 ( 104) a space enclosed by the outer vertical cylindrical iron plate 105, the dust collecting cylinder cylindrical plate 106

A hollow cone having a hollow cone, a donut behavior, an electric furnace loop body 110 and a cooling water supply unit 120 for supplying and distributing cooling water into an electric furnace loop, and receiving the cooling water and spraying the entire conical hot plate 101. A natural drain 150 consisting of a spray pipe assembly 130, a vacuum drain 140 constituted by a passage through which the coolant collected and flowed into the vacuum is discharged, and a passage through which the collected coolant is naturally drained; The cooling water filling unit 160 extends in the space opposite to the vacuum drain 140 and continuously replenishes the cooling water, and the slag fixing protrusion 171 for forming the slag layer.

The electric furnace loop 100 of the cooling spray method is a device that serves to block high temperature gas and heat generated from the inside of an ironworks electric furnace not shown.

In addition, a small ceiling seat 172 for seating the small ceiling to accommodate the electrode, and the EL security seat 173 that is the entrance of the passage for discharging the hot gas is additionally provided.

Cooling water is used to protect the electric furnace loop body 110 from high temperature heat. The cooling water pressurized from the outside of the electric furnace is not shown through a cooling water supply pipe 121 connected to a cooling water supply pipe including a flexible bendable hose. Electricity is supplied into the roof. The cooling water then spreads through all of the spray pipe assemblies 130 through the cooling water distribution pipe 122. The injection pipe assembly 130 includes a coupling 132 that can be quickly attached and detached, and a plurality of injection nozzles 131 are attached to the end of the branch so that the opposite surface of the entire surface exposed to the high temperature of the conical hot plate 101 is exposed. Cooling water is sprayed toward.

Cooling water that flows quickly down the conical high-temperature iron plate 101 that forms a downward slope toward the outside is drained through the vacuum drain inlet 141 provided to the outlet of the electric furnace and the natural drain inlet 152 provided on the slag door.

Coolant is discharged to the vacuum drain inlet 141 which is finally connected to a vacuum pump such as a jet pump outside the electric furnace, and the coolant passes through the vacuum drain passage 142 and passes through the vacuum drain 143 to the external drain pipe and the jet pump. The final discharge is through.

In addition, the natural drainage portion 150 is separately provided on the opposite side of the vacuum drainage inlet 141 to discharge part of the cooling water collected and flowed to the external pipe.

The electric furnace loop of the cooling spray method is usually drained into two places, the vacuum drain inlet 141 and the natural drain inlet 152, but when the tap is removed or the slag is excluded, the electric furnace is drained to one of the two drains. Is done.

First, when the slag is excluded, the entire electric furnace including the furnace roof main body 110 is inclined toward the slag door so that the cooling water is collected and discharged into the natural drain 150 and is not discharged into the vacuum drain.

And when the tapping is inclined to the opposite side, all the coolant flows into the vacuum drain inlet 141, and the vacuum drain port 143 located at a position higher than the vacuum drain inlet 141 through the vacuum drain passage 142 by the vacuum pump. It is pumped up to pass through the external drain pipe and drained through the vacuum pump, and is not discharged to the natural drain.

In this way, the two drain inlets are located on opposite sides of the tap, but since the two final drain holes of the furnace are located close to the natural drain inlet, the vacuum drain inlet 141 is lower than the position of the vacuum drain 143. It has a structure to draw up and discharge the coolant every time.

On the other hand, the electric furnace loop body 110 is turned away from the electric furnace to inject the scrap into the electric furnace, and at this time, the external vertical cylindrical iron plate 105 is temporarily exposed to high temperature heat inside the electric furnace. Thus, in order to cool the entire external vertical cylindrical iron plate 105, a coolant filling unit 160 through which coolant may pass, such as a vacuum drain passage 142, is further configured.

The coolant filling unit 160 is completely separated from the vacuum drain passage 142 by two vacuum drain plates disposed opposite to each other. A coolant filling induction pipe 161 connecting the coolant distribution pipe 122 and the coolant filling inside 163 fills the supplied coolant to some of the coolant filling inside 153 and is opposite to the coolant filling induction pipe 161 on the opposite side. The small coolant filling discharge port 162 is drilled to discharge the coolant into the loop body 110 electrically so that new coolant is always supplied.

Meanwhile, the slag fixing protrusion 171 is attached to the entire area of the conical high temperature iron plate 101 exposed to high temperature heat so that the slag film is formed to prevent exposure to high temperature heat. The slag fixing protrusion 171 has a shape of the slag fixing protrusion 171. Producing and attaching in an open form toward the center of the loop has the advantage that the slag adheres better.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described specific embodiments, and the present invention is not limited to the specific scope of the present invention as claimed in the claims. Anyone of ordinary skill in the art can make various modifications, as well as such modifications are within the scope of the claims.

100: electric furnace loop of the spray cooling method 110: electric furnace loop body
120: cooling water supply unit 130: injection pipe assembly
140: vacuum drain 150: natural drain
160: cooling water filling unit 171: slag protrusion fixed portion

Claims (4)

Form an airtight, closed enclosed cooling space to block high temperature gases and heat generated from the steel mill's electric furnace. When the water is inclined to drain the coolant only to the natural drain, when tilted for tapping, the vacuum drain is located close to the natural drain and the vacuum drain inlet is located on the opposite side to discharge the coolant only through the vacuum drain. An electric furnace loop body connected to each other by a vacuum drain passage,
A cooling water supply unit connected to an external water supply pipe for distributing cooling water to the entire area of the furnace loop body;
A plurality of injection pipe assemblies which have a plurality of injection nozzles assembled at the end to inject cooling water to the entire conical hot plate;
A vacuum drain portion for sucking up and draining the cooling water sprayed and collected by a vacuum pump;
A natural drainage part for draining the cooling water collected on the opposite side of the inlet of the vacuum drainage part;
Located in the opposite side of the vacuum drain and has an independent space and the coolant filling unit to which the coolant is separately supplied;
And a slag fixing protrusion attached to an entire area of the conical hot plate.

delete The method of claim 1, wherein the coolant filling unit is separated from the vacuum drainage passage by two vacuum drain separators, and is directly connected to the coolant distribution pipe by the coolant filling induction pipe, so that the coolant is supplied and filled, rather than the size of the coolant filling induction pipe. A spray-cooled furnace loop, characterized by flowing coolant back into the furnace body through a small coolant filling outlet. The electric furnace loop of the spray cooling method according to claim 1, wherein the slag fixing protrusion is attached to the entire area of the conical high-temperature steel plate in an open form toward the center of the furnace roof.

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