阅读说明：本技术 风口喷水装置 (Tuyere water spraying device ) 是由 金善英 金炫秀 崔茂业 于 2019-06-18 设计创作，主要内容包括：本发明提供风口喷水装置。根据本发明的风口喷水装置包括：氧气供应管,其连接在熔炼炉的风口,用于向风口供应氧气或含氧气体；以及喷水嘴,其设置在氧气供应管的侧面上,用于向熔炼炉内部供水。(The invention provides a tuyere water spraying device. The tuyere water-spraying device according to the present invention includes: an oxygen supply pipe connected to a tuyere of the smelting furnace for supplying oxygen or an oxygen-containing gas to the tuyere; and a water spray nozzle provided on a side of the oxygen supply pipe for supplying water to the interior of the smelting furnace.)

1. A tuyere stock arrangement, comprising:

an oxygen supply pipe connected to a tuyere of the smelting furnace for supplying oxygen or oxygen-containing gas to the tuyere; and

water spray nozzles, provided on the side of the oxygen supply pipe, for feeding the oxygen or oxygen-containing gas flowing through the inside of the oxygen supply pipe as a gas transport medium to the interior of the smelting furnace.

2. The tuyere water jet device of claim 1,

the oxygen supply tube includes: an insertion portion inserted into the air vent; and a connecting portion connected to the insertion portion and exposed to the outside of the furnace body of the melting furnace, and connected to an oxygen main pipe for blowing oxygen into the tuyere.

3. The tuyere water jet device of claim 2,

the water spray nozzle is arranged on the connecting part of the oxygen supply pipe.

4. The tuyere water jet device of claim 3,

the water spray nozzle is adjacently arranged at the flow inlet of the air port.

5. The tuyere water jet device of claim 1,

the water particle size sprayed by the water spray nozzle is set to 10 to 500 micrometers.

6. The tuyere water jet device of claim 1,

the water spray nozzle is obliquely arranged relative to the length direction of the oxygen supply pipe and is arranged on the oxygen supply pipe.

7. The tuyere water jet device of claim 6,

the water spray nozzle is arranged on the oxygen supply pipe in a set range of 5 degrees to 30 degrees relative to the length direction of the oxygen supply pipe.

8. The tuyere water jet device of claim 7,

the water spray nozzle comprises a nozzle head inserted into the oxygen supply pipe.

9. The tuyere water jet device according to any one of claims 1 to 8,

the water spray nozzle comprises a single-fluid nozzle for applying pressure to water for spraying or a two-fluid nozzle for mixing water with other gas and spraying the mixture into water particles as particles.

10. The tuyere water jet device of claim 9,

the water spray nozzle comprises a single fluid nozzle and is set to spray water at a pressure 0.5bar to 1.5bar higher than the pressure of oxygen in the oxygen supply tube.

11. The tuyere water jet device of claim 9,

the water spray nozzle comprises a two-fluid nozzle, and the gas blown together with the water is any one of nitrogen, air, oxygen or a mixed gas of the nitrogen, the air and the oxygen.

12. The tuyere water jet device of claim 11,

when an oxygen-containing gas is used in the two-fluid nozzle, the amount of oxygen supplied to the oxygen supply pipe is reduced by an amount equivalent to the amount of oxygen contained in the oxygen-containing gas used in the two-fluid nozzle.

Technical Field

The invention relates to a tuyere water spraying device.

Background

In general, in a known melting furnace of a smelting reduction iron making process such as FINEX, nitrogen gas is removed to keep the amount of gas in the furnace low, and normal temperature oxygen gas is blown through a tuyere, so that the gas heat generation is high and the temperature of a combustion zone is excessively increased.

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

However, in a melting furnace into which oxygen at normal temperature is blown, when steam is mixed with cold air, the steam changes phase from gas to liquid, and is condensed in the duct, and is not uniformly blown into each tuyere branch pipe, and the condensed water causes non-uniformity in the flow rate of oxygen.

In addition, there is a method of installing a steam flow meter in each branch pipe to mix steam before oxygen is blown into the melting furnace. However, the necessity of installing an expensive steam flow meter in each branch pipe involves a risk of cost, and the price of steam itself is high, thereby having a disadvantage of increasing the production cost.

In addition, a technique is disclosed in which a water spray line is directly provided at a tuyere to directly spray water into the furnace of the smelting furnace without mixing steam into the blown gas.

However, these methods cannot sufficiently exhibit the effect of lowering the temperature of the combustion zone because water cannot flow into the combustion zone due to insufficient water injection speed.

Further, the operation of injecting water into the melting furnace is not always performed, and can be temporarily employed only when the Si content in the molten iron is high or the temperature of the molten iron is excessively high.

In addition, when there is no water spray, it is necessary to continuously blow nitrogen gas to avoid clogging or damage of the water spray line exposed to high temperature.

Disclosure of Invention

Technical problem

The invention provides a tuyere water spraying device, which can stabilize the temperature of a combustion zone by spraying normal-temperature water and normal-temperature oxygen into a tuyere of a smelting furnace, so as to prevent the increase of Si content in molten iron caused by the excessive temperature rise of the combustion zone in a smelting reduction iron-making process.

Technical scheme

The tuyere stock injection apparatus according to an exemplary embodiment of the present invention may include an oxygen supply pipe connected to a tuyere of the smelting furnace for supplying oxygen or oxygen-containing gas to the tuyere.

Further, the tuyere water injection device may include water injection nozzles provided on the side of the oxygen supply pipe for supplying oxygen or oxygen-containing gas flowing through the inside of the oxygen supply pipe as a gas transport medium to the inside of the smelting furnace.

The oxygen supply tube may include: an insertion portion inserted into the air inlet; and a connecting portion connected to the insertion portion and exposed to the outside of the furnace body of the melting furnace, and connected to an oxygen main pipe for blowing oxygen into the tuyere.

The water spray nozzle may be provided on the connection portion of the oxygen supply pipe.

The water nozzle can be arranged adjacent to the inlet of the tuyere.

The water particle size sprayed by the water spray nozzle may be set to 10 to 500 micrometers.

The water spray nozzle may be arranged obliquely with respect to the length direction of the oxygen supply pipe and provided on the oxygen supply pipe.

The water spray nozzle may be disposed on the oxygen supply pipe at an angle ranging from 5 degrees to 30 degrees with respect to the length direction of the oxygen supply pipe.

The water spray nozzle may comprise a nozzle head inserted into the oxygen supply pipe.

The water spray nozzle may be a single fluid nozzle for spraying water by applying pressure thereto or a two-fluid nozzle for spraying water particles as fine particles after mixing water with other gas.

The water spray nozzle may comprise a single fluid nozzle and is set such that the single fluid nozzle sprays water at a pressure 0.5bar to 1.5bar higher than the pressure of oxygen in the oxygen supply tube.

The water spray nozzle may comprise a two-fluid nozzle and the gas to be blown in with the water may be any one of nitrogen, air, oxygen or a mixture thereof.

When an oxygen-containing gas is used in the two-fluid nozzle, the amount of oxygen supplied to the oxygen supply pipe can be reduced by an amount equivalent to the amount of oxygen contained in the gas.

Effects of the invention

According to the exemplary embodiments of the present invention, the density of water does not vary greatly even if pressure is applied, thus facilitating control of the flow rate, not only is the cost of water less than that of steam used, but also the phase change of water from a liquid state to a gaseous state absorbs much heat, so that the combustion zone temperature adjusting effect is great even if a small amount of water is injected, and the generation amount of Si0 gas can be reduced.

In addition, hydrogen generated as a result of the reaction functions as a reducing gas in the furnace, and reacts with reduced iron faster than carbon monoxide, so that the effects of removing fine powder of the core and increasing the reducing power can be obtained.

Further, since the nozzle tip of the water jet nozzle is not exposed to the furnace of the melting furnace but is connected to the low-temperature oxygen supply pipe, no other measures for protecting the water jet nozzle line need be taken even when the water jet operation is not performed.

Drawings

Fig. 1 is a schematic structural view of a tuyere water injection device according to an embodiment of the present invention.

FIG. 2 is a graph of water particle size versus the velocity of a water particle falling vertically due to gravity.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice the present invention. As will be understood by those of ordinary skill in the art to which the present invention pertains, the following embodiments may be modified into various forms without departing from the concept and scope of the present invention. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, actions, elements, and/or components, but do not preclude the presence or addition of other features, integers, steps, actions, elements, components, and/or groups thereof.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in a dictionary should be further interpreted as having meanings consistent with those disclosed in the related art documents and the present specification, and terms not defined in a dictionary should not be interpreted in an idealized and/or overly formal sense.

Fig. 1 is a schematic structural view of a tuyere water jet device according to an embodiment of the present invention, and fig. 2 is a graph of a water particle size versus a velocity of water particles falling vertically due to gravity.

Referring to fig. 1 and 2, the tuyere stock solution spraying apparatus according to one embodiment of the present invention can stabilize the temperature of a combustion zone by spraying normal temperature water together with normal temperature oxygen into a tuyere of a smelting furnace to prevent an increase in Si content in molten iron.

The smelting furnace 10 of the smelting reduction iron making process may be provided with a plurality of tuyeres 20 at a set height at a certain angle.

The tuyeres 20 are provided at predetermined intervals in the circumferential direction of the melting furnace 10, and can blow hot air, pulverized coal, and the like into the interior of the melting furnace.

The tuyere stock injection apparatus according to an embodiment of the present invention may include an oxygen supply tube 100 connected to the tuyeres 20 of the smelting furnace 10 for supplying oxygen or oxygen-containing gas to each of the tuyeres 20.

The oxygen supply pipe 100 may be connected to an oxygen main pipe 30 for blowing oxygen produced by an oxygen plant into each tuyere 20.

Furthermore, water nozzles 200 may be included, which are provided on the side of the oxygen supply tube 100, for supplying oxygen or oxygen-containing gas flowing through the inside of the oxygen supply tube 100 as a gas transport medium to the inside of the smelting furnace 10.

The tuyere 20 supports the oxygen supply pipe 100 by penetrating the furnace body 11 inserted into the melting furnace 10, and includes a cooling water line for protecting the pipe, a pulverized coal blowing line, and the like.

The tuyere 20 may be formed as an injection passage having an inflow port 21 and a discharge port 23, and as a whole, may be formed in a tapered shape in which the diameter gradually decreases from the inflow port 21 to the discharge port 23 side.

The oxygen supply tube 100 may include: an insertion portion 110 inserted into the tuyere 20; and a connecting part 120 connected to the insertion part 110, exposed to the outside of the furnace body 11 of the smelting furnace 10, and connected to the oxygen main pipe 30.

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

A taper portion having a gradually changing diameter connected to the connection portion 120 may be formed between one end of the insertion portion 110 and the connection portion 120.

The oxygen supply tube 100 may have the same center line as the lengthwise center line (X-X line of fig. 1) of the tuyere 20.

The tuyere 20 is provided with a cooling water line, a pulverized coal line (not shown), and the like, and the water nozzle 200 may be provided at the connection portion 120 of the oxygen supply pipe 100 exposed to the outside of the tuyere 20 because it is a consumable item that is periodically replaced.

Further, the water spray nozzle 200 may be disposed at any position in the oxygen supply tube 100, but may be disposed adjacent to the inflow port 21 of the tuyere 20 in order to increase the oxygen transport force, since the oxygen transport force is lower as the water particle size is larger.

Fig. 2 is a graph in which the vertical falling speed of water particles by gravity becomes faster as the water particle size becomes larger.

The water particles injected from the water spray nozzles 200 fall vertically and must be blown into the melting furnace 10 along with the flow of oxygen or gas before they condense in the oxygen supply pipe 100.

Therefore, the size of the water particles (water droplets) ejected by the water ejection nozzle 200 may be set to 500 micrometers or less, particularly 10 to 500 micrometers, so as to be able to enter the interior of the melting furnace 10 without condensing inside the oxygen supply pipe 100.

The water spray nozzle 200 may be obliquely arranged with respect to the length direction of the oxygen supply tube 100 (X-X direction of fig. 1) and provided on the oxygen supply tube 100 to prevent the sprayed water particles from colliding with the inner wall of the oxygen supply tube 100 to be condensed.

The water spray nozzle 200 may be installed on the oxygen supply pipe 100 at an angle ranging from 5 degrees to 30 degrees with respect to the longitudinal direction of the oxygen supply pipe 100 so that the sprayed water particles do not collide with the inner wall of the oxygen supply pipe 100 to be condensed and are easily blown into the interior of the melting furnace 10 along with the flow of oxygen or gas.

One end of the water spray nozzle 200 may be inserted into the interior of the oxygen supply pipe 100 to a predetermined depth so that the sprayed water particles are easily blown into the interior of the melting furnace 10 along with the flow of oxygen or gas.

When the water spout 200 is inserted too far into the oxygen supply pipe 100, the flow of oxygen may be obstructed, for example, the area inside the oxygen supply pipe 100 may be reduced, or there may be a risk that the components of the water spout 200 may be dropped off to block the oxygen supply pipe 100 due to a strong air flow.

Therefore, to minimize the water particles ejected by water jet 200 from interfering with the flow of oxygen or gas, water jet 200 may include a nozzle tip 210 inserted within oxygen supply tube 100.

A water pressure regulator 220 may be provided on the water jet nozzle 200 for regulating the pressure of the water sprayed by the water jet nozzle 200.

In addition, the water jet nozzle 200 may be provided with a filter 230 for filtering impurities from the water sprayed from the water jet nozzle 200.

The water nozzle 200 may be a single fluid nozzle that applies pressure to water to spray or a two fluid nozzle that mixes water with other gases and sprays the mixture into a water having a very small particle size.

The water spray nozzle 200 includes a single fluid nozzle that sprays water out of the nozzle using only the pressure of the water, and thus the spray pressure should be set to be about 0.5bar to 1.5bar higher than the pressure of oxygen gas in the oxygen supply tube 100.

The water nozzle 200 includes a two-fluid nozzle, and any one of nitrogen, air, and oxygen, or a mixed gas thereof, or the like can be used as the gas to be blown together with water.

Nitrogen is an inert gas that does not cause a reaction in the melting furnace 10, and therefore, the effect of lowering the temperature of the combustion zone can be further obtained.

When a nitrogen-containing gas is used in the two-fluid nozzle, the amount of the gas used may be determined based on this in consideration of further decrease in temperature.

When the oxygen-containing gas is used in the two-fluid nozzle, the amount of oxygen blown may be adjusted in consideration of the increase in the amount of oxygen compared to when water is not sprayed.

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

The operation of the tuyere stock solution device according to one embodiment of the present invention will be described in detail with reference to fig. 1 and 2.

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

The side wall of the connecting part 120 of the oxygen supply pipe 100 exposed to the outside of the melting furnace 10 is provided with a water nozzle 200.

Further, the water jet nozzle 200 is provided adjacent to the inflow port 21 of the tuyere 20 to reduce the water particle size and increase the oxygen transport force.

With the water jet nozzle 200 thus provided, when water at normal temperature is jetted as fine particles, water can be blown into the furnace of the melting furnace 10 by using oxygen or gas in the oxygen supply pipe 100 as a gas transport medium without causing condensation in the oxygen supply pipe 100.

Fig. 2 is a graph showing that the vertical falling speed of water particles due to gravity becomes faster as the size of the water particles becomes larger.

The water particles fall vertically and must be able to blow into the furnace 10 with the flow of oxygen before condensing in the oxygen supply pipe 100.

According to fig. 2, when the size of water particles (water droplets) is 500 μm, the velocity of vertical drop is about 1m/s, and assuming that the diameter of the oxygen supply tube 100 is 80mm, the time required for the drop is 0.08 seconds.

When the flow rate of the gas in the oxygen supply tube 100 was 20m/s, the horizontal distance over which 500 μm water droplets could move with the flow of oxygen was about 1.6m, which is similar to the length of a conventional oxygen supply tube.

Therefore, the size of the water droplets should be below 500 μm so that they do not bottom condense in the oxygen supply tube and can enter the furnace 10.

The water spray nozzle 200 is obliquely arranged at an angle of 5 to 30 degrees with respect to the length direction (X-X direction of fig. 1) of the oxygen supply tube 100 and is provided on the oxygen supply tube 100, so that it is possible to prevent water particles sprayed from the water spray nozzle 200 from colliding with the inner wall of the oxygen supply tube 100 and being condensed.

In addition, when the water jet nozzle 200 is inserted too deeply into the oxygen supply pipe 100, the flow of oxygen may be obstructed, for example, the area inside the oxygen supply pipe 100 may be reduced, or a part of the water jet nozzle 200 may be detached due to a strong air current to block the oxygen supply pipe 100.

Therefore, the nozzle head 210 of the water jet nozzle 200 is partially inserted into the oxygen supply pipe 100, so that the water jet nozzle 200 can be prevented from interfering with the flow of oxygen as much as possible.

Description of the symbols

10: smelting furnace

11: furnace body

20: tuyere

30: oxygen main pipeline

100: oxygen supply pipe

200: water spray nozzle

210: nozzle head

220: water pressure regulator