KR102158227B1 - Device for providing water in tuyere - Google Patents

Abstract

Provides a device for receiving air balloons. The apparatus for receiving a tuyere according to the present invention includes an oxygen supply pipe connected to the tuyere of the melting furnace to supply oxygen or oxygen-containing gas to the tuyere, and water spray for supplying water to the inside of the melting furnace by being installed on the side of the oxygen supply tube. Includes a nozzle.

Description

Punggu receiving device {DEVICE FOR PROVIDING WATER IN TUYERE}

The present invention relates to an apparatus for receiving a tuyere.

In general, the melting furnace of the melt-reduction steelmaking process known as FINEX, etc., removes nitrogen to keep the amount of gas in the furnace low, and blows oxygen at room temperature into the fan, so that the gas calorific value is high and the combustion zone temperature rises excessively.

In order to solve this problem, in order to reduce the amount of silicon oxide (SiO) gas generated in the combustion zone and lower the internal temperature, a technique of mixing and blowing steam with gas containing oxygen blown into the combustion zone has been disclosed.

However, when steam is mixed with cold air in a melting furnace that blows oxygen at room temperature, the steam causes a phase change from gas to liquid, which causes condensation in the pipe, and the condensed water is not evenly blown for each fan branch, and the condensed water is uneven in the flow rate of oxygen. There was a problem such as letting go.

In addition, there is a method of mixing steam just before oxygen is blown into the melting furnace by installing a steam flow meter for each branch, but there is a cost risk of having to install an expensive steam flow meter in every branch one by one, and the price of the steam itself is expensive. There was a drawback of increasing production costs.

In addition, there is also disclosed a technique of directly blowing water into a melting furnace by installing a receiving line directly on the windpipe without mixing steam with the blowing gas.

However, such a method cannot sufficiently perform the function of lowering the temperature of the combustion zone because water cannot flow into the combustion zone due to insufficient water injection speed.

In addition, the operation of blowing water into the melting furnace is an operation method that can be used temporarily only when the Si content of the molten iron is high or the temperature of the hot steel is too high, not an operation that is always required.

In addition, when not receiving and receiving, there is a problem that nitrogen must be continuously injected so that the receiving and receiving lines exposed to high temperatures are not blocked or damaged.

In order to prevent an increase in Si content in the molten iron due to an excessive increase in the temperature of the combustion zone in the melt-reduction steelmaking process, the present invention receives a wind bulb capable of stabilizing the temperature of the combustion zone by spraying and blowing room temperature water together with room temperature oxygen into the wind hole of the melting furnace We want to provide a mouth device.

The apparatus for receiving a tuyere according to an embodiment of the present invention may include an oxygen supply pipe connected to a tuyere of a melting furnace to supply oxygen or a gas containing oxygen to the tuyere.

In addition, the air blower receiving device may include a water spray nozzle installed on the side of the oxygen supply pipe to supply water into the melting furnace by using oxygen or a gas containing oxygen flowing through the oxygen supply pipe as a transport medium.

The oxygen supply pipe may include an insertion portion inserted into the windpipe, and a connection portion connected to the insertion portion, exposed to the outside of the furnace body of the melting furnace, and connected to an oxygen main pipe for injecting oxygen into the windpipe.

The water injection nozzle may be installed at the connection part of the oxygen supply pipe.

The water jet nozzle may be installed close to the inlet of the windpipe.

The size of the water particles sprayed by the water jet nozzle may be set in the range of 10 micrometers to 500 micrometers.

The water injection nozzle may be disposed at an angle with respect to the longitudinal direction of the oxygen supply pipe and installed in the oxygen supply pipe.

The water injection nozzle may be installed in the oxygen supply pipe at an angle set in a range of 5 degrees to 30 degrees with respect to the longitudinal direction of the oxygen supply pipe.

The water jet nozzle may include a nozzle tip inserted and installed in the oxygen supply pipe.

The water jet nozzle may be a hydraulic nozzle for spraying water by applying pressure, or a two-fluid nozzle for spraying water particles into fine particles by mixing other gas with water.

The water jet nozzle includes a hydraulic nozzle, and the injection pressure of water of the hydraulic nozzle may be set to be 0.5 to 1.5 bar higher than the pressure of oxygen in the oxygen supply pipe.

The water jet nozzle includes a two-fluid nozzle, and the gas blown together with water may be any one of nitrogen, air, and oxygen, or a gas mixture thereof.

When a gas containing oxygen is used in the air nozzle, the amount of oxygen supplied to the oxygen supply pipe may be reduced by the amount of oxygen contained in the gas.

According to an embodiment of the present invention, water does not change significantly in density even when pressure is applied, so it is convenient to control flow rate and is cheaper than steam, and it absorbs a large amount of heat when the phase changes from liquid to gaseous. Even if it is blown, the combustion zone temperature control effect is great, and the amount of SiO gas generated can be reduced.

In addition, hydrogen generated as a result of the reaction acts as a reducing gas in the furnace, and since the reaction rate with reduced iron is faster than carbon monoxide, it may bring effects such as removal of fines in the core and increase in reducing power.

In addition, since the nozzle tip of the water spray nozzle is not exposed in the melting furnace and is connected to the hot and cold oxygen supply pipe, there is an advantage that no special measures are required to protect the water spray nozzle line even when the water spray is not used. .

1 is a schematic configuration diagram of a wind blower receiving device according to an embodiment of the present invention.
2 is a graph showing the relationship between the size of water particles and the speed at which water particles fall vertically by gravity.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. As those of ordinary skill in the art to which the present invention pertains can be easily understood, the embodiments to be described later may be modified in various forms without departing from the concept and scope of the present invention. As far as possible, the same or similar parts are indicated using the same reference numerals in the drawings.

The terminology used below is only for referring to specific embodiments, and is not intended to limit the present invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising" as used in the specification specifies a particular characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component and/or group It does not exclude the existence or addition of

All terms including technical and scientific terms used below have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. The terms defined in the dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and are not interpreted in an ideal or very formal meaning unless defined.

FIG. 1 is a schematic configuration diagram of an apparatus for receiving a wind blower according to an embodiment of the present invention, and FIG. 2 is a graph showing a relationship between the size of water particles and the speed at which water particles fall vertically by gravity.

Referring to FIGS. 1 and 2, the apparatus for receiving a tuyere according to an embodiment of the present invention sprays and injects room temperature moisture with room temperature oxygen into a melting furnace windpipe in order to prevent an increase in Si content in the molten iron to prevent the temperature of the combustion zone. It is a device that can stabilize.

A plurality of windpipes 20 may be installed in the melting furnace 10 of the melt-reduction steelmaking process at a predetermined angle at a set height.

The windpipe 20 is installed at intervals set in the circumferential direction of the melting furnace 10 to blow hot air and pulverized coal into the furnace.

The apparatus for receiving a tuyere according to an embodiment of the present invention provides an oxygen supply pipe 100 for supplying oxygen or a gas containing oxygen to the tuyere 20 by being connected to the tuyere 20 of the melting furnace 10 Can include.

The oxygen supply pipe 100 may be connected to an oxygen main pipe 30 for blowing oxygen produced in an oxygen factory or the like into each of the air outlets 20.

In addition, a water spray nozzle 200 installed on the side of the oxygen supply pipe 100 to supply water into the melting furnace 10 using oxygen or a gas containing oxygen flowing through the oxygen supply pipe 100 as a transport medium. ) Can be included.

The windpipe 20 may be inserted through the furnace body 11 of the melting furnace 10 to support the oxygen supply pipe 100 and include a cooling water line and a pulverized coal injection line for protecting the pipe.

The air outlet 20 forms an inlet passage having an inlet 21 and an outlet 23, and may be formed in a tapered shape to gradually decrease in diameter from the inlet 21 to the outlet 23 as a whole.

The oxygen supply pipe 100 is connected to the insertion part 110 inserted into the air outlet 20 and the insertion part 110, exposed to the outside of the furnace body 11 of the melting furnace 10, and connected to the oxygen main pipe 30. It may include a connection part 120.

The diameter of the insertion part 110 may have a diameter smaller than that of the connection part 120.

Between the one end of the insertion portion 110 and the connection portion 120 may be formed in the shape of a tapered portion that is connected to the connection portion 120 and gradually changes in diameter.

The oxygen supply pipe 100 may have the same center line as the longitudinal center line (X-X line in FIG. 1) of the air blower 20.

Since the cooling water line and the pulverized coal line (not shown) are installed in the windpipe 20 and are periodically replaced consumables, the water spray nozzle 200 is a connection part of the oxygen supply pipe 100 exposed to the outside of the windpipe 20 ( 120) can be installed.

In addition, the water spray nozzle 200 may be installed at any position in the oxygen supply pipe 100, but the larger the size of the water particles, the lower the oxygen transfer power, so the inlet 21 of the air port 20 to increase the oxygen transfer power. ) Can be installed close to.

FIG. 2 shows a graph showing that as the size of the water particles increases, the speed at which the particles fall vertically increases due to gravity.

The water particles sprayed by the water jet nozzle 200 must be able to fall vertically and be blown into the melting furnace 10 along the flow of oxygen or gas before being condensed in the oxygen supply pipe 100.

Therefore, the size of the water particles (water droplets) sprayed by the water jet nozzle 200 is 500 micrometers or less, especially 10 to less, so that it is possible to enter the melting furnace 10 without causing condensation in the oxygen supply pipe 100. It can be set in the 500 micrometer range.

The water spray nozzle 200 is disposed at an angle with respect to the longitudinal direction of the oxygen supply pipe 100 (in the direction of line XX in FIG. 1) to prevent the sprayed water particles from colliding with the inner wall of the oxygen supply pipe 100 and condensation. It may be installed in the supply pipe 100.

The water injection nozzle 200 is 5 degrees to the longitudinal direction of the oxygen supply pipe 100 so that the sprayed water particles can be easily blown along the flow of oxygen or gas without condensation by hitting the inner wall of the oxygen supply pipe 100. It may be installed in the oxygen supply pipe 100 at an angle set in the range of 30 degrees.

One end of the water injection nozzle 200 may be inserted into the oxygen supply pipe 100 at a set depth so that the sprayed water particles can be easily blown along the flow of oxygen or gas.

When the water spray nozzle 200 is installed by being inserted too deeply into the oxygen supply pipe 100, the flow of oxygen such as reducing the area inside the oxygen supply pipe 100 is obstructed, or the accessories of the water spray nozzle 200 are There is a fear that it may be dropped and block the oxygen supply pipe 100.

Therefore, in order to minimize the obstruction of the flow of oxygen or gas by the water particles sprayed by the water spray nozzle 200, the water spray nozzle 200 includes a nozzle tip 210 inserted and installed in the oxygen supply pipe 100. I can.

A water pressure regulator 220 for controlling a pressure of water sprayed by the water spray nozzle 200 may be installed in the water spray nozzle 200.

In addition, a filter 230 for filtering foreign substances of water sprayed by the water injection nozzle 200 may be installed in the water injection nozzle 200.

The water jet nozzle 200 may be a hydraulic nozzle for spraying water by applying pressure, or a two-fluid nozzle for spraying the size of water particles very finely by mixing water with another gas.

The water spray nozzle 200 includes a hydraulic nozzle, and the hydraulic nozzle sprays water out of the nozzle using only the pressure of water, so that the injection pressure is the amount of oxygen in the oxygen supply pipe 100. It should be set above the pressure by 0.5 to 1.5 bar.

The water jet nozzle 200 includes a two-fluid nozzle, and may use any one of nitrogen, air, and oxygen, or a mixture thereof, as a gas blown together with water.

Since nitrogen is an inert gas that does not cause a reaction in the melting furnace 10, an effect of lowering the temperature of the combustion zone can be additionally obtained.

When a gas containing nitrogen is used in the air nozzle, the amount of gas used may be determined in consideration of an additional temperature drop.

When a gas containing oxygen is used in a two-fluid nozzle, the amount of oxygen to be blown can be adjusted by calculating the increase in the amount of oxygen compared to when not receiving or receiving oxygen.

That is, when a gas containing oxygen is used in the two-fluid nozzle, the amount of oxygen supplied through the oxygen supply pipe 100 may be reduced by the amount of oxygen used additionally.

Hereinafter, with reference to FIGS. 1 and 2, a description will be given of the operation of the air balloon receiving device according to an embodiment of the present invention.

In the oxygen supply pipe 100 branched from the oxygen main pipe 30 and connected to the air outlet 20 of the melting furnace 10, for example, compressed oxygen of 6 bar.g or more flows at a speed of about 20 m/s.

A water spray nozzle 200 is installed on the side wall of the connecting portion 120 exposed to the outside of the melting furnace 10 of the oxygen supply pipe 100.

In addition, the water spray nozzle 200 is installed close to the inlet 21 of the air port 20 in order to increase the oxygen transfer power by reducing the water particle size.

By spraying water at room temperature as fine particles by the water spray nozzle 200 installed as described above, without causing condensation in the oxygen supply pipe 100, oxygen or gas in the oxygen supply pipe 100 is used as a transport medium to 10) Water can be blown into the furnace.

In addition, FIG. 2 shows a graph showing that as the size of water particles increases, the speed at which the particles fall vertically increases by gravity.

Before water particles fall vertically and condensate in the oxygen supply pipe 100, they must be able to be blown into the melting furnace 10 along the flow of oxygen.

As shown in FIG. 2, when the size of water particles (water droplets) is 500 micrometers, the vertically falling speed is about 1 m/s, and when the diameter of the oxygen supply pipe 100 is 80 mm, it falls. It takes 0.08 seconds.

When the flow rate of gas in the oxygen supply pipe 100 is 20 m/s, the horizontal distance at which 500 micrometers of water droplets can move according to the flow of oxygen is about 1.6 m, which is similar to the length of a conventional oxygen supply pipe.

Therefore, it is possible to enter the melting furnace 10 without causing condensation on the inner bottom of the oxygen supply pipe when the size of the water droplet is 500 micrometers or less.

Since the water injection nozzle 200 is disposed at an angle of 5 to 30 degrees with respect to the longitudinal direction of the oxygen supply pipe 100 (the XX direction in FIG. 1) and is installed in the oxygen supply pipe 100, the water injection nozzle 200 ), it is possible to prevent condensation by hitting the inner wall of the oxygen supply pipe 100.

In addition, if the water spray nozzle 200 is installed too deeply in the oxygen supply pipe 100, the flow of oxygen is prevented, such as reducing the inner area of the oxygen supply pipe 100, or the accessory of the water spray nozzle 200 is eliminated due to a strong air flow. There is a fear of blocking the supply pipe 100.

For this reason, since the nozzle tip 210 of the water spray nozzle 200 is inserted and installed in the oxygen supply pipe 100, it is possible to minimize the obstruction of the flow of oxygen by the water spray nozzle 200.

10: melting furnace
11: Noche
20: Punggu
30: oxygen main piping
100: oxygen supply pipe
200: water spray nozzle
210: nozzle tip
220: hydraulic pressure regulator

Claims (12)

An oxygen supply pipe for supplying oxygen or a gas containing oxygen to the windpipe of the melting furnace, and
It is installed on the side of the oxygen supply pipe, and includes a water jet nozzle for supplying water into the melting furnace by using the oxygen or oxygen-containing gas flowing through the oxygen supply pipe as a transport medium,
The oxygen supply pipe, an insertion part inserted into the air outlet,
And a connection part connected to the insertion part, exposed to the outside of the furnace body of the melting furnace, and connected to an oxygen main pipe for injecting oxygen into the windpipe,
The water injection nozzle is installed at the connection part of the oxygen supply pipe,
One end portion of the water injection nozzle is inserted into the interior of the connection portion of the oxygen supply pipe, air balloon receiving device. delete delete The method of claim 1,
The water jet nozzle is installed in close proximity to the inlet of the air blower. The method of claim 1,
The size of the water particles sprayed by the water jet nozzle is set in the range of 10 micrometers to 500 micrometers, the air balloon receiving device. The method of claim 1,
The water jet nozzle is disposed obliquely with respect to the longitudinal direction of the oxygen supply pipe and is installed in the oxygen supply pipe. The method of claim 6,
The water jet nozzle is installed in the oxygen supply pipe at an angle set in a range of 5 degrees to 30 degrees with respect to the longitudinal direction of the oxygen supply pipe. The method of claim 7,
The water injection nozzle includes a nozzle tip inserted and installed in the oxygen supply pipe. The method according to any one of claims 4 to 8,
The water jet nozzle is a hydraulic nozzle for spraying water by applying pressure, or a two-fluid nozzle for spraying water particles into fine particles by mixing other gas with water. The method of claim 9,
The water jet nozzle comprises a hydraulic nozzle, and the water injection pressure of the hydraulic nozzle is set to be 0.5 to 1.5 bar higher than the pressure of oxygen in the oxygen supply pipe. The method of claim 9,
The water jet nozzle includes a two-fluid nozzle, and the gas blown together with water is any one of nitrogen, air, and oxygen, or a mixture of these gases. The method of claim 11,
When a gas containing oxygen is used in the air nozzle, the amount of oxygen supplied to the oxygen supply pipe is reduced by the amount of oxygen contained in the gas.

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