KR101076189B1 - Water cooling cover for blast furnace - Google Patents

Abstract

The present invention forms a cooling water jacket on the blast furnace cover to maximize the cooling efficiency to improve durability, and can recognize this when the cooling water leaks, and its structure is improved to replace the cooling function with gas instead of cooling water. The present invention relates to a water cooling cover for a large blast furnace.

Its structure is composed of a structure covering the upper part of the main bath and the refractory is disposed on the inner circumferential surface, and a cover body in which a metal plate is disposed outward of the refractory; And a cooling water jacket having a flow path through which gas is circulated, and cooling water and gas supply means for selecting and supplying either cooling water or gas in the flow path of the cooling water jacket.

According to this, the present invention can replace the function of the cooling water when the cooling water leaks, it is possible not only to quickly recover operation without interruption, but also has a useful effect that can extend the life of the cover for the large hot water using the cooling water or gas.

Description

Water cooling cover for blast furnace

The present invention relates to a water cooling cover for the blast furnace large waterway, and more particularly, to form a cooling water jacket on the cover disposed above the blast furnace waterway to maximize the cooling efficiency to extend the life and to recognize when the cooling water leaks. The present invention relates to a water cooling cover for blast furnace large waterway, whose structure is improved so that it can be replaced.

In general, the blast furnace is charged with iron ore and coke in the interior of the blast furnace to supply hot hot air to the lower part of the blast furnace to produce iron by melting and reducing the iron ore and coke, and the produced water is produced on one side of the blast furnace Through the pioneer, it flows down to the large bath.

At this time, the water is discharged through the exit of the blast furnace located above the height of the large waterway, so that the high temperature water is scattered to the outside of the large waterway due to the fall, causing work delay and threatening worker safety. I have a dispensation of being.

Therefore, to prevent the worker's safety accident and increase the work efficiency by blocking the scattering of molten water, a semi-circular case is formed to cover the upper part of the large hot water and the heat resistance of high temperature molten water on the inner surface of the case. In order to increase the weight of the refractory cover was used.

The molten metal moving along the large hot water is at a high temperature of about 1500 ° C when produced in the furnace, and as a result, there is no means for efficiently cooling the phenomenon of heating due to contact with the molten metal and radiant heat. After a certain period of time, the cracks and damage of the refractory, as well as the thermal deformation of the cover has a disadvantage that the use efficiency is lowered.

To this end, conventionally, in order to solve the above problems, it is provided with a splash cover, which is composed of refractory and steel shells to prevent the scattering of the melt from the blast furnace to the hot water and block the high temperature, is installed on the hot water, but the melt is hot It is installed at the top of the incision of the refractory part that receives intensive heating from the cooling channel through which the coolant is circulated, the protective box positioned by inserting the insulation material in the lower part of the cooling channel, and the protective box is bolted to the iron shell. A blast furnace large-scale water splash cover having a heating part cooling device, which is composed of a detachable refractory fixed to a lower portion of a protective box, has been conceived by Korean Patent Publication No. 10-2004-0088761.

However, the "melting furnace large splash splash cover with a heating part cooling device" is a structure in which a cooling channel and a protection box are installed after cutting a portion, which is not only deteriorated in operation efficiency due to the complexity and hassle of the work as a whole. It is difficult to manufacture, and the increase in production cost has the disadvantage of extremely limited use efficiency and range of use.

In particular, the "melting furnace large splash splash cover with a heating unit cooling device" is a part of the cover is cut because of the high temperature radiant heat is easily gap deformation of the incision, which will eventually cause damage and breakage of the cover I have a serious closure.

In addition, when the heat deformation of the cover as described above it is impossible to smoothly produce and transport the molten water through the water bath, resulting in a huge economic loss due to the delay work.

Moreover, the "melting furnace large splash splash cover with a heating part cooling device" has a pipe-type cooling channel installed on the upper part of the refractory to cool the radiant heat of the molten metal, but the cooling channel has a cooling channel due to high temperature after a certain time. Since part of the block is easily deformed and blocked, the entire circulation of the coolant is impossible.

In addition, when the cooling channel is damaged or damaged, there is a fear that an explosion may occur when the cooling water comes into contact with the water of the large bath.

Therefore, the structure is simple and the cooling efficiency can be maximized, and the thermal deformation of the cover can be minimized to improve the replacement cycle and durability, and the water cooling cover for the blast furnace can prevent the risk of explosion by the coolant. It is more urgently needed than ever.

The present invention has been proposed in view of the above-mentioned problems, and an object thereof is to form a plurality of partitions on both sides of the outer cover and install an upper cover to cover the upper part of the partition as a whole, and on one side of the upper cover of the cooling water. The present invention provides a blast furnace water cooling cover for maximizing cooling efficiency by inducing a smooth circulation of cooling water by supplying and discharging.

Another object of the present invention is to provide a water cooling cover for the blast furnace so that the large hot water cover can be cooled by substituting gas for cooling water when the cooling water leaks.

The present invention for achieving the above object is formed so as to cover the top of the large bath and the refractory is disposed on the inner peripheral surface and the plate is disposed on the outside of the refractory,

A coolant jacket disposed on an outer surface of the cover body and having a flow path through which water is circulated;

Cooling water and gas supply means for selecting and supplying one of the cooling water or gas through the selection means in the flow path of the cooling water jacket is characterized in that it is provided.

The gas adopts nitrogen gas.

It further comprises a rib extending perpendicular to the plate surface of the cover body.

The cooling water and gas supply means is disposed on one side of the cooling water jacket and in communication with the flow path and connected to the cooling water supply pipe;

A discharge port disposed at the other side of the cooling water jacket and connected to the cooling water and the gas discharge pipe to discharge the cooling water and the gas in the flow path to the outside;

It is provided with a gas supply pipe connected to the inlet for supplying gas into the flow path of the cooling water jacket.

The selection means is disposed in the cooling water supply pipe and the cooling water and gas discharge pipe, respectively, and a pressure gauge for measuring the pressure of the cooling water flowing into the cooling water jacket, respectively;

On and off valves respectively disposed in close proximity to the pressure gauge and having a function of supplying and blocking the cooling water,

The gas supply pipe is provided with a gas valve for supplying / blocking the gas supplied to the cooling water jacket side.

The present invention forms a cooling water jacket on the blast furnace cover to maximize the cooling efficiency to improve durability, and can recognize this when the cooling water leaks, and its structure is improved to replace the cooling function with gas instead of cooling water. According to the present invention, since the present invention can replace the function of the cooling water when the cooling water leaks, it is possible not only to promptly recover the operation without interruption of operation, but also to extend the life of the cover for the large hot water using the cooling water or gas. Has a useful effect.

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

1 is a configuration diagram schematically showing the configuration of the water cooling cover for blast furnace large waterway of the present invention, Figure 2 is a cross-sectional view showing a cross-sectional structure of the present invention the cooling water jacket.

When the water cooling cover for blast furnace large waterway according to the present invention will be described with reference to Figs. A coolant jacket 20 having a cover body 10 disposed therein, a coolant jacket 20 disposed in a zigzag form on a plate outer surface of the cover body 10 and having a flow path through which coolant and gas are circulated, and a flow path of the coolant jacket 20. It consists of a cooling water and gas supply means which selects and supplies either cooling water or gas in the inside.

In more detail, the coolant jacket 20 has a structure in which an inlet port 25 communicating with the flow path is disposed at one side, and an outlet port 27 communicating with the flow passage is disposed at the other side spaced apart from the inlet port 25.

Cooling water jacket 20 has a structure in which both ends are bent to the outer surface of the plate is attached to form a flow path that is a passage through which fluid flows.

Cooling water and gas supply means is a cooling water supply pipe 52 connected to the inlet 25 through the inlet port 25 to supply the cooling water, and a gas supply connected to the inlet port 25 and selectively supplying gas into the flow path by the selection means Cooling water and gas discharge pipe 54 for discharging the coolant or gas through the outlet 27 so that the coolant or gas supplied through the pipe 56 and the inlet 25 is circulated along the flow path of the coolant jacket 20. It is composed of

The selection means is for supplying the coolant or gas into the flow path of the coolant jacket 20, and is disposed in the coolant supply pipe 52 and the coolant and gas discharge pipe 54, respectively, and flows into the coolant jacket 20. The pressure gauge 60 for measuring the pressure of the cooling water to be respectively, disposed in the position close to the pressure gauges 60, the on-off valve 70 and the gas supply pipe 56 and having a function of supplying and blocking the cooling water is disposed And a gas valve 75 for supplying / blocking gas supplied to the coolant jacket 20.

The on / off valve 70 and the gas valve 75 recognize that the coolant is leaked when a pressure difference between the pressure gauges 60 occurs, and shuts off the coolant supplied to the coolant jacket 20 by turning off the on / off valve 70. , The gas valve 75 is turned on to supply gas to the inlet port 25.

At this time, the reason why the gas is supplied when the cooling water leaks is that there is a risk of explosion when the cooling water leaked from the cooling water jacket 20 comes into contact with the molten metal in the large bath.

Therefore, when the leakage of the coolant jacket 20 is suspected, after discharging the coolant in the coolant jacket 20 to the outside, gas is supplied to replace the function of the coolant.

For this purpose, the on-off valve 70 and the gas valve 75 preferably adopt a solenoid valve known in the art, but may employ a manual valve.

In addition, the operation of the on-off valve 70 and the gas valve 75 automatically recognizes a pressure signal transmitted from the pressure gauge 60 and recognizes a leak of the coolant jacket 20. Adopt the automatic control method to supply the inside of the flow path, or in the case of solenoid valve, the operator can press the button to apply the electric signal to the valve side to operate each valve. Since these are general methods, detailed description thereof will be omitted.

In addition, the plate is formed with ribs 15 extending vertically on the outer surface for reinforcement.

In addition, the inlet 25 has a first connector 25a connected to the cooling water supply pipe 52 and a second connector connected to the gas supply pipe 56 separately provided at a position spaced apart from the first connector 25a. 25b).

The outlet 27 is provided with a third connector 27a for connection with the cooling water and the gas discharge pipe 54.

Here, the gas preferably has a cooling function in circulation of the coolant jacket 20 and employs nitrogen gas having explosion stability.

The operation of the present invention having such a configuration will now be described.

In the blast furnace water cooling cover according to the present invention, after the cover body 10 is disposed so as to be positioned above the large bath, the cooling water is supplied into the cooling water jacket 20 through the inlet 25 in the cooling water supply pipe 52. When supplied, the supplied coolant is heat-exchanged with the heated cover body 10 in the course of circulating along the coolant jacket 20 arranged in a jig zag to cool the cover body 10, and then through the outlet 27. And it is discharged to the outside through the gas discharge pipe 54.

At this time, the gas valve 75 of the gas supply pipe 56 is in an off state, and the opening and closing valve 70 of the cooling water supply pipe 52 and the cooling water and gas discharge pipe 54 is kept in an on state.

Then, when the coolant jacket 20 is damaged or broken due to erosion or thermal deformation and the coolant is leaked, the pressure gauge 60 disposed on the coolant supply pipe 52 and the pressure gauge disposed on the coolant and gas discharge pipe 54. A pressure difference of 60 occurs.

The operator recognizes this and operates the on / off valve 70 of the coolant supply pipe 52 to be turned off, and operates the gas valve 75 of the gas supply pipe 56 to be turned on to operate the gas in the coolant jacket 20. To feed.

Subsequently, nitrogen gas flows into the coolant jacket 20 through the second connector 25b of the inlet 25, and circulates inside the flow path of the coolant jacket 20, so that nitrogen gas is replaced with the coolant jacket ( A cooling function is given to the cover main body 10 while circulating 20).

Accordingly, the present invention discharges the coolant to the outside through the coolant and the gas discharge pipe 54 in the situation in which the leak of the coolant is suspected or leaks, as described above, the nitrogen gas is discharged into the flow path of the coolant jacket 20. Since the inlet can replace the function of the coolant, even when the coolant leaks, it is possible to quickly recover the work without interruption of operation.

In addition, the rib 15 provides a rigidity against the thermal deformation of the plate to improve the durability.

1 is a configuration diagram schematically showing the configuration of the water cooling cover for blast furnace large waterway of the present invention.

2 is a cross-sectional view showing a cross-sectional structure of the present invention coolant jacket.

Explanation of symbols on the main parts of the drawings

10: cover body 15: rib

20: coolant jacket 25: inlet

27: outlet 52: cooling water supply piping

54: cooling water and gas discharge piping 56: gas supply piping

60: pressure gauge 70: on-off valve

75: gas valve

Claims (5)

A cover body (10) formed to cover the upper portion of the large bath and having a refractory disposed on an inner circumferential surface and a plate disposed outside the refractory; A coolant jacket 20 disposed on an outer surface of the cover body 10 and having a flow path through which water is circulated; And Cooling water and nitrogen gas supply means for supplying by selecting one of the cooling water or gas through the selection means in the flow path of the cooling water jacket 20, The cooling water and gas supply means, An inlet port 25 disposed at one side of the coolant jacket 20 and connected to a coolant supply pipe 52 for supplying coolant into the coolant jacket 20; A gas supply pipe 56 connected to the inlet 25 and supplying gas into the flow path of the coolant jacket 20; An outlet 27 disposed at the other side of the coolant jacket 20 and connected to the coolant supply pipe 52 and the gas supply pipe 56; And It is connected to the outlet 27 includes a cooling water and gas discharge pipe 54 for discharging the cooling water or gas to the outside, The selection means, A pressure gauge (60) disposed in the cooling water supply pipe (52), the cooling water and the gas discharge pipe (54), respectively, for measuring the pressure of the cooling water flowing into the cooling water jacket (20); An on / off valve (70) disposed at positions adjacent to the pressure gauges (60) and having a function of supplying and blocking the cooling water; Including a gas valve 75 disposed in the gas supply pipe 56 for supplying / blocking gas supplied to the cooling water jacket 20 side, When circulating the coolant into the coolant jacket 20 through the coolant supply pipe 52, the gas valve 52 is turned off to keep the gas supply shut off. When a pressure difference occurs between the pressure gauge 60 disposed in the cooling water supply pipe 52 and the pressure gauge 60 disposed in the cooling water and gas discharge pipe 54, an opening / closing valve 70 of the cooling water supply pipe 52 is provided. Off to cut off the supply of cooling water, the gas valve 75 of the gas supply pipe 56 by turning on to supply the gas to the cooling water jacket 20, characterized in that the water cooling cover. delete The method according to claim 1, Water cooling cover for blast furnace large hot water characterized in that it further comprises a rib (15) extending perpendicular to the plate surface of the cover body (10). delete delete

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