KR101557136B1 - Device for transferring powder of apparatus for manufacturing molten iron - Google Patents

Abstract

A storage bin in which a powder is stored and an outlet is formed at a lower portion so as to uniformly supply powder for inducing a decrease in slag melting point, a conveyance line connected to an outlet of the storage bin for conveying the powder, And a gas supply part connected to the outlet, the lower part extending outwardly of the storage space and communicating with the transfer line, the upper part extending into the storage space and having a plurality of holes into which powder is introduced, And a powder transporting device of a molten iron manufacturing facility.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a powder transfer apparatus for a molten iron manufacturing facility,

The present invention relates to a molten iron manufacturing facility. More particularly, the present invention relates to a powder transfer apparatus for a molten iron manufacturing facility capable of uniformly transferring powder supplied into a molten iron manufacturing facility.

Recently, in order to solve the problems of the blast furnace method, steel mills in the world have directly used general coal as a fuel and reducing agent, and iron ore has been used to manufacture molten iron by directly using minerals that occupy more than 80% And it is making great efforts to develop a molten reduction steelmaking method.

A melt reduction steelmaking process for producing molten iron using direct mining ore involves a reducing process for reducing minerals and a melting process for melting the reduced minerals in a melting furnace. Melting and reducing steelmaking facilities are known as FINEX and COREX facilities according to the reduction process.

The FINEX plant includes a multi-stage fluidized-bed reactor, a compacting facility, and a melter-gasifier (hereafter referred to as a melting furnace) connected thereto. At the room temperature, the minerals and additives are reduced through the multiple fluidized-bed reactors in turn. Reduced iron is compacted by compacting equipment and charged into a melting furnace. The melting furnace melts the reduced iron ore to produce molten iron. In the melting furnace, a large amount of carbon monoxide is generated by the combustion of coal, and this carbon monoxide is introduced as a reducing gas into the fluidized-bed reactor.

The Corlex facility includes a reduction furnace and a melting furnace. In the reduction furnace, raw materials such as iron ores and pellets containing strangeness spectroscopy, and subsidiary materials such as limestone and dolomite are charged and reduced. The melting furnace melts the reduced iron ore to produce molten iron. The reducing gas containing carbon monoxide and hydrogen generated in the combustion process by the oxygen blown through the tuyere of the melting furnace is taken into the reducing furnace.

In the melting furnace, the reduced iron and the subsidiary material are melted by the high heat generated by the combustion of the coal, which is the fuel, and are generated as charcoal and slag. The slag interferes with the evacuation of molten iron through the outlet of the melting furnace when the fluidity in the melting furnace is deteriorated.

The slag fluidity is deteriorated when the control of the amount of the slag is unsatisfactory because the cricical factor determining the fluidity of the slag is silicon dioxide (SiO2), aluminum oxide (Al2O3), calcium oxide (CaO) and magnesium oxide (MgO) .

Further, when the molten iron temperature is lowered to 1450 占 폚 or less due to the poor control of the heat control, the slag temperature is lower than the slag melting point and the fluidity is lowered.

Conventionally, optimization of the input amount of silicon dioxide (SiO 2), aluminum oxide (Al 2 O 3), calcium oxide (CaO) and magnesium oxide (MgO) is carried out by adjusting the amount of ore, coal, Thus, it was attempted to prevent the deterioration of the flowability of the slag by controlling the melting point of the slag.

However, it is extremely difficult to supply silicon dioxide (SiO2), aluminum oxide (Al2O3), calcium oxide (CaO), and magnesium oxide (MgO) at an accurate amount in accordance with the composition ratio.

A powder conveying device of a molten iron manufacturing facility capable of uniformly supplying powders for inducing a decrease in slag melting point in a melting furnace is provided.

The apparatus of this embodiment includes a storage bin in which powder is stored and an outlet is formed at a lower portion thereof, a transfer line connected to an outlet of the storage bin for transferring powder, a gas supply unit connected to the transfer line for supplying gas for powder transfer, And a discharge pipe connected to the outlet and having a lower portion extending to the outside of the storage bin and communicating with the transfer line, the upper portion extending into the storage bin and having a plurality of holes into which powder is introduced.

The discharge pipe may be installed perpendicular to the bottom surface of the storage bin.

And a cone-shaped cone member installed at the upper end of the discharge pipe to guide the powder toward the side of the discharge pipe.

The apparatus may further include a flow unit for supplying a gas into the storage bin and introducing the powder into the hole of the discharge pipe through the gas flow.

The flow unit may include a plurality of gas holes formed on a bottom surface of the storage bin, a supply chamber coupled to a lower end of the storage bin and connected to the gas holes to supply gas, and a gas supply line connected to the supply chamber .

The discharge pipe is installed at the center of the bottom of the storage bin, and the gas holes may be arranged on the bottom surface of the storage bin around the discharge pipe.

And a valve provided in the gas hole to prevent the discharge of the powder by blocking the gas hole when the supply of the gas is cut off.

The valve includes an elastic material plate installed on the inner bottom surface of the storage bin to cover the gas hole and a fastener for fixing the plate to the gas hole. The plate is lifted elastically by gas pressure, And when the gas supply is interrupted, it may return to the original state to close the gas holes.

As described above, according to this embodiment, the lower outlet of the storage bin is prevented from clogging, and the powder can be uniformly and smoothly transferred.

1 is a schematic view showing a molten iron manufacturing facility according to the present embodiment.
2 is a cross-sectional view showing a powder transfer apparatus of a molten iron manufacturing facility according to the present embodiment.
3 is a view showing an operation state of the powder conveying apparatus according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

In the following description, the powder conveying apparatus of this embodiment will be described by taking a structure applied to a molten iron manufacturing facility as an example. Powder refers to a powder form having a small particle size. The present powder transporting apparatus is not limited to a molten iron manufacturing facility, and is applicable to all facilities requiring powder transport.

1 is a schematic view showing a molten iron manufacturing facility according to the present embodiment.

As shown in Fig. 1, a molten iron manufacturing facility uses molten iron and coal to manufacture molten iron. The molten iron manufacturing facility is a reduced-bed type in which a reduced iron reduced through one or more fluidized-bed reduction reactors for producing a reduced iron by reducing spectroscopy, or an iron-containing iron ore such as pellets or assembled iron ores having a particle size of 8 mm or more, And a melting furnace (100) for melting molten reduced iron through a reduction furnace to produce molten iron.

The reduced iron is charged into the melting furnace 100 and is melted by the combustion of the coal packed bed formed by the lumpy carbonaceous material and is made of molten iron. In the melting furnace 100, massive carbonaceous materials as fuel and dense compacted bodies are continuously supplied, and oxygen is blown through the tuyere 102 formed on the outer wall to burn coal. The combustion gas of coal is increased inside the melting furnace 100 and is converted to a high-temperature reducing air stream. The reducing gas discharged from the melting furnace 100 is transferred to the cyclone through the discharge pipe connected to the gas discharge port and supplied to the reducing furnace through the cyclone.

The apparatus for manufacturing molten iron further includes a pulverizing and discharging facility 200 for introducing pulverized coal through the tuyere 102 of the furnace 100. Pulverized coal is used to stabilize the melting furnace operation by controlling the temperature in the combustion depth and to save fuel.

The pulverized coal blowing facility 200 supplies the pulverized coal as auxiliary fuel to the furnace 100 tuyere 102 together with oxygen. The pulverized coal blowing facility 200 includes a grinding mill 202 for pulverizing coal into a pulverized state, a bag filter 204 for sorting the pulverized pulverized coal in the grinding mill 202, And a pulverized coal blowing line 208 for supplying the pulverized coal stored in the pulverized coal storage bin 206 to the tuyere 102 of the furnace 100. [

The pulverized coal produced in the grinding mill 202 is stored in the pulverized coal storage bin 206 via the bag filter 204 and then supplied to the tuyere 102 of the furnace 100 through the pulverized coal blowing line 208. The pulverized coal introduced into the furnace (100) together with oxygen through the tuyere (102) melts the reduced iron as an auxiliary fuel.

The apparatus for manufacturing molten iron further includes a powder transfer device 300 for injecting powder for lowering the slag melting point into the melting furnace 100 through the tuyere 102 of the melting furnace 100.

In this embodiment, the powder may comprise light soda ash (Na2O3). The light shed ash is introduced into the melting furnace 100 to increase the Na2O content of the slag components, thereby inducing a decrease in the melting point of the slag. As a result, the melting point of the slag is lowered and the fluidity of the slag is increased.

Usually, the flowability of the slag depends on the viscosity, the basicity and the melting temperature. When the melting point of the slag is lowered, the fluidity becomes good, and the slag easily reacts in the melting furnace 100. Since the slag has a specific gravity smaller than that of the pig iron,

The powder conveying apparatus 300 is connected to the pulverized coal storage bin 206 to supply powder into the pulverized coal storage bin 206 and feed it into the furnace 100 together with the pulverized coal.

FIG. 2 and FIG. 3 show the powder conveying apparatus, and the powder conveying apparatus will be described with reference to FIGS. 2 and 3. FIG.

The powder transfer apparatus 300 includes a storage bin 302 in which powder is stored, a transfer line 304 connected between the lower portion of the storage bin 302 and the pulverized coal storage bin 206 to transfer the powder, a transfer line 304 And a gas supply part 306 connected to the supply part for supplying the transfer gas for powder transportation.

The powder transport apparatus 300 is connected to the bottom surface 303 and the lower portion extends outwardly from the storage bin 302 to communicate with the transport line 304 and the upper portion extends into the storage bin 302, And a discharge pipe 310 having a plurality of holes 312 through which powder is introduced.

The storage bin 302 is a container in which powder is stored, and an outlet 305 through which the powder is discharged is formed at the center of the bottom surface 303 of the lower end. The discharge pipe 310 is connected to the outlet 305 and installed vertically on the bottom surface 303 of the storage bin 302.

The discharge tube 310 discharges the powder in the storage bin 302 while preventing the powder outlet 305 from clogging.

The discharge pipe 310 is an open hollow cylindrical pipe structure and is installed through the outlet 305. The upper portion of the discharge pipe 310 extends into the storage bin 302 and protrudes to a predetermined height from the bottom surface 303 of the storage bin 302. A plurality of holes 312 are formed at intervals along the outer peripheral surface of the discharge pipe 310. The holes 312 may be spaced apart from the bottom surface 303 of the storage bin 302 and may be biased toward the upper end of the discharge pipe 310. By positioning the position of the hole 312 higher than the bottom surface 303, it is possible to prevent the hole 312 from being clogged by the powder pressed down by the weight by being piled down inside the storage bin 302.

The upper end of the discharge pipe 310 has a closed structure so that the powder in the storage bin 302 flows into the discharge pipe 310 only through the hole 312.

In this embodiment, a cone-shaped cone member 314 is provided at the upper end of the discharge pipe 310. The cone member 314 has a vertically pointed central portion and an inclined side surface. The cone member 314 guides the powder to the side of the discharge pipe 310. The powder above the discharge pipe 310 in the storage bin 302 moves along the inclined surface of the cone member 314 and flows toward the side of the discharge pipe 310. [ The lower end diameter of the cone member 314 may be larger than the outer diameter of the discharge pipe 310. Thus, the cone member 314 covers the upper end of the discharge pipe 310 and blocks the upper side of the discharge pipe 310. Therefore, at the lower side of the cone member 314, that is, at the inlet side of the hole 312, it is minimized that the powder is pushed down to prevent the hole 312 from being clogged by the powder.

The powder stored in the storage bin 302 is discharged through the hole 312 of the discharge pipe 310 rather than the outlet 305 formed on the bottom surface 303. [ The hole 312 is formed in a side surface of the discharge pipe 310 vertically installed on the bottom surface 303, and is perpendicular to the direction in which the weight of the powder is applied. Thus, the influence of the self weight of the powder is reduced, and the powder is smoothly and uniformly discharged through the holes 312 without clogging the holes 312. [

The lower end of the discharge pipe 310 is opened and communicated with the transfer line 304. The lower end of the discharge pipe 310 is disposed at right angles to the transfer line 304 and connected to the side of the transfer line 304.

The transfer line 304 has a structure for transferring powder using gas. One end of the transfer line 304 is connected to the gas supply unit 306 to receive the powder transfer gas and the other end is connected to the pulverized coal storage bin 206. The powder of the storage bin 302 is discharged to the transfer line 304 through the discharge pipe 310 provided at the outlet 305 and is transferred by the gas flowing along the transfer line 304 to be discharged into the pulverized coal storage bin 206 .

The gas supply unit 306 supplies an inert gas to the transfer line 304 to transfer the powder. In this embodiment, the gas supplied through the gas supply unit 306 may be nitrogen (N2).

Here, the conveying apparatus of this embodiment further includes a flow unit for supplying a gas into the storage bin 302 and introducing the powder into the hole 312 of the discharge pipe 310 through the gas flow.

The flow unit includes a plurality of gas holes 320 formed on the bottom surface 303 of the storage bin 302 and a plurality of gas holes 320 connected to the lower ends of the storage bores 302 and connected to the respective gas holes 320, A supply chamber 322, and a gas supply line 324 connected to the supply chamber 322.

The gas holes 320 are evenly arranged on the bottom surface 303 of the storage bin 302 around a discharge pipe 310 installed at the center of the bottom surface 303 of the storage bin 302. Thus, the gas ejected from the gas holes 320 uniformly applies gas pressure to the entire outer circumferential surface of the discharge pipe 310, thereby uniformly discharging the powder through the holes 312 formed in the discharge pipe 310.

2, the supply chamber 322 is formed outside the bottom surface 303 of the discharge pipe 310 to form a common space communicating with the respective gas holes 320. The gas holes 320 are connected to the supply chamber 322 in common. The gas supplied to the supply chamber 322 is uniformly injected into the storage bin 302 through each gas hole 320 connected to the supply chamber 322. [

A discharge pipe 310 is vertically installed at the center of the bottom surface 303 so that the discharge pipe 310 passes into the supply chamber 322 provided outside the bottom surface 303.

The discharge tube 310 is connected to the transfer line 304 which extends outward beyond the supply chamber 322 and is located outside the supply chamber 322 or is connected to the supply chamber 322 as in this embodiment shown in Fig. The transfer line 304 is passed through and the discharge line 310 can be connected to the transfer line 304 within the supply chamber 322. The combination structure of the supply chamber 322, the discharge pipe 310 and the transfer line 304 at the lower end of the discharge pipe 310 can be variously changed.

A gas supply line 324 is connected to the lower end of the supply chamber 322. The gas supplied through the gas supply line 324 may be nitrogen (N2). In the present embodiment, the gas supply line 324 is connected to the gas supply unit 306 to receive nitrogen from the gas supply unit.

The gas supplied to the supply chamber 322 through the gas supply line 324 is ejected into the storage bin 302 through the gas hole 320 formed in the bottom surface 303. The gas ejected from the gas hole 320 rises up to apply pressure to the powder deposited on the bottom surface 303. The gas pressure causes the powder to escape to the hole 312 of the discharge pipe 310 standing vertically. The powder discharged through the hole 312 is transferred to the pulverized coal storage bin by the gas flowing down the transfer line 304 along the discharge pipe 310 and into the transfer line 304.

Thus, unlike the conventional structure in which the discharge of the powder is discharged from the bottom surface 303 by gravity in the present embodiment, the discharged powder is discharged through the hole 312 of the vertically installed discharge pipe 310. Furthermore, the powder is discharged by the gas pressure flowing upward from the bottom. Therefore, the flow of the gas injected through the gas hole 320 and the gas pressure applied to the powder serve to prevent the hole 312 of the discharge pipe 310 from being clogged. Thus, the powder in the storage bin 302 can be continuously smoothly and uniformly ejected.

The powder in the storage bin 302 can escape through the gas hole 320 when the gas supply is interrupted.

Accordingly, the apparatus further includes a valve for blocking the gas hole (320) to prevent the discharge of the powder when the gas supply is interrupted.

3, the valve includes an elastic material plate 326 installed on the inner bottom surface 303 of the storage bin 302 to cover the gas hole 320, 320). ≪ / RTI >

When the gas is supplied, the plate 326 is lifted elastically by the gas pressure to open the gas hole 320, and when the gas supply is interrupted, the plate 326 returns to its original state and closes the gas hole 320.

The plate 326 may be made of any material having elasticity such as rubber or silicone. The plates 326 are installed individually for each gas hole 320. The plate 326 is formed to be larger than the gas hole 320 so as to sufficiently cover the gas hole 320. The fastener 328 may be, for example, a bolt and nut structure that is fixed to the bottom surface 303 through the plate 326. The fastener 328 is fixed to the bottom surface 303 through the gas hole 320 and the center portion of the plate 326 is fixed to the fastener 328 to be positioned at the center of the gas hole 320 do. When each plate 326 is lifted up from the state of being fixed to the gas hole 320, a gap is generated between the gas hole 320 and the plate 326 and the gas is discharged. When the plate 326 is returned to its original state, 303 to shut off the gas holes 320.

Therefore, when the gas supply is interrupted, the gas holes 320 are blocked by the plate 326, so that the gas holes 320 can be blocked by the powder or the powder can be prevented from flowing out through the gas holes 320.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

100: melting furnace 102: tungsten
104: Outgoing port 200: Pulverized coal intake facility
202: Grinding mill 204: Bag filter
206: Pulverized coal storage bin 208: Blown line
300: Powder transfer device 302: Storage bin
303: bottom surface 304: transfer line
305: outlet 306: gas supply
310: discharge pipe 312: hole
314: cone member 320: gas hole
322: common chamber 324: gas supply line
326: plate 328: fastener

Claims (8)

A storage vessel connected to the outlet of the storage bin for transferring the powder, a gas supply unit connected to the transfer line for supplying a gas for powder transport, A discharge pipe having a lower portion extending to the outside of the storage bin and communicating with the transfer line and having an upper portion extending into the storage bin and having a plurality of holes into which powder is introduced, And a flow portion for introducing the gas into the hole of the discharge pipe,
Wherein the flow unit includes a plurality of gas holes formed in a bottom surface of the storage bin and a valve provided in the gas hole to prevent discharge of the powder by closing the gas hole when the supply of gas is cut off, And a fixing hole for fixing the plate to the gas hole. The plate is lifted elastically by the gas pressure to open the gas hole, and when the gas is cut off A powder conveying device of a molten iron manufacturing facility structured to close a gas hole by returning to its original state. The method according to claim 1,
Wherein the discharge pipe is vertically installed on a bottom surface of a storage bin. 3. The method of claim 2,
Further comprising a cone-shaped cone member mounted on an upper end of the discharge pipe to guide the powder to the side of the discharge pipe. delete The method according to claim 1,
Wherein the flow unit includes a supply chamber connected to the lower end of the storage bin and connected to the gas holes to supply gas, and a gas supply line connected to the supply chamber. The method according to claim 1,
Wherein the discharge pipe is installed at the center of the bottom of the storage bin and the gas hole is arranged at the bottom of the storage bin with the discharge pipe as a center. delete delete

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