CN213060916U - Slag discharging structure for smelting reduction furnace - Google Patents

Abstract

The application discloses sediment structure is arranged to smelting reduction furnace for belongs to smelting reduction furnace technical equipment field. This slag discharging structure for smelting reduction furnace includes: the smelting reduction furnace comprises an iron bath area and a heat exchange area, the iron bath area is positioned below the heat exchange area, a deslagging structure is arranged on the furnace wall corresponding to the iron bath area and/or the heat exchange area, the deslagging structure is built by prefabricated refractory bricks, through holes are formed in the prefabricated refractory bricks, the through holes are sequentially connected end to form a deslagging channel, the deslagging channel comprises a feeding port and a discharging port, and the deslagging channel is downwards inclined by 0-45 degrees from the feeding port to the discharging port. This arrange sediment structure can be with the slag discharge outside the stove alone, and then with slag and molten iron phase separation, the separation mode is simple, efficient, convenient to use, arranges sediment simple structure, does not produce the damage to furnace body equipment, and the security is high, structural design is reasonable, arranges sediment smoothly.

Description

Slag discharging structure for smelting reduction furnace

Technical Field

The application relates to a slag discharging structure for a smelting reduction furnace, and belongs to the technical equipment field of smelting reduction furnaces.

Background

The HIsmelt technology core smelting reduction furnace (SRV furnace for short) is the main equipment for producing iron by reducing iron oxides such as iron ore powder and the like. The SRV furnace sequentially comprises an iron bath area, a heat exchange area, a combustion area and a gas chamber from bottom to top; in order to ensure that the injected materials can generate reduction and combustion reactions, an iron bath area of the SRV furnace needs to store 300-350 tons of molten iron, and the molten iron is stored in the iron bath area as a catalytic condition for C + Fe2O3 → Fe + CO reaction; meanwhile, 150-ton slag is required to be stored in the heat exchange area, so that molten iron in the iron bath area is prevented from directly contacting oxygen-enriched hot air to be oxidized, and heat is transferred into the iron bath area from the combustion area by the splashed slag; about 500 tons of slag and molten iron are always stored in the SRV furnace during the normal production period, and the normal running of the reduction reaction in the SRV furnace can be maintained. The SRV furnace is provided with a residual iron hole at the bottom of the iron bath area and is used for discharging molten iron and slag stored in the furnace out of the furnace when the SRV furnace is safely stopped, so that the phenomenon that the residual molten iron and slag are solidified in the furnace to influence the next normal furnace opening is avoided.

In the existing traditional blast furnace residue discharge scheme, in the blow-out process of a smelting reduction furnace, firstly, slag is discharged from an iron outlet along with molten iron to the liquid level in the furnace and is reduced to be lower than the height of the iron outlet, the slag and the molten iron are separated by a skimmer in an iron outlet channel outside the furnace, and residual molten iron and slag on a residual dead iron layer (below a normal iron outlet) in the furnace are discharged by arranging a residual iron outlet. Because the slag and the molten iron have certain difference in properties, the temperature in the slag discharging process is reduced quickly, the melting point of the slag is above 1300 ℃, and the melting point of the molten iron is only about 1100 ℃, so that slag caking and blockage of an iron residue hole are easy to occur, and certain difficulty is brought to production operation.

The position of the residual iron hole is determined according to the furnace age, the temperature of the furnace base, the water temperature difference of the cooling wall, the temperature of the upper furnace wall and the lower furnace wall of the residual iron layer and the like, and the position of the residual iron layer is perforated. The water cooling pipe at the position of the residual iron hole needs to be removed and cut, cold surface grouting material is cleaned, a cooling wall is cut, drilling is carried out by adopting drilling equipment, the drilling is stopped until the position of 800 ℃, and an oxygen pipe is used for extending into the residual iron hole to burn out the residual iron. The operation of the blast furnace for producing the residual iron is labor-consuming and time-consuming, permanent damage is caused to the blast furnace equipment by adopting the drilling and mining equipment, the time is long, the danger coefficient is high, the operation is complex and the like.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the slag discharging structure for the smelting reduction furnace is provided, the slag discharging structure can discharge slag outside the furnace independently, then the slag and molten iron are separated, the separation mode is simple, the efficiency is high, the use is convenient, the slag discharging structure is simple, the furnace body equipment is not damaged, the safety is high, the structural design is reasonable, and the slag discharging is smooth.

The application provides a slag discharging structure for smelting reduction furnace, smelting reduction furnace includes iron bath district and heat transfer district, iron bath district is located the below in heat transfer district, the oven that iron bath district and/or heat transfer district correspond is equipped with arrange the sediment structure, arrange the sediment structure by prefabricated refractory brick step extremely to forming, through-hole has been seted up to prefabricated refractory brick, the through-hole meets in proper order end to end and forms the slag discharging channel, the slag discharging channel includes the pan feeding mouth that communicates with smelting reduction furnace and the discharge gate that is linked together with the external world, the slag discharging channel is from pan feeding mouth to discharge gate downward sloping 0 ° -45 °.

Optionally, the deslagging channel is inclined downwards by 0-30 degrees from the feeding port to the discharging port.

Further, the slag tapping structure is located near the slag-iron level in the iron bath zone and/or the heat transfer zone.

Optionally, the section of the slag discharge channel is in a circular structure or an elliptical structure.

Optionally, the two ends of the prefabricated refractory brick are respectively a protruding end and a recessed end, and the protruding end of the prefabricated refractory brick can be embedded into the recessed end of an adjacent prefabricated refractory brick.

Optionally, the furnace wall of the smelting reduction furnace comprises a pouring layer and a masonry layer from outside to inside, the prefabricated refractory bricks comprise first prefabricated refractory bricks and second prefabricated refractory bricks, the first prefabricated refractory bricks are arranged in the pouring layer, and the second prefabricated refractory bricks are arranged in the masonry layer;

the second prefabricated refractory brick is respectively provided with a large end part and a small end part along the axial two ends of the through hole, the small end part faces the inner side of the furnace wall, and the large end part faces the first prefabricated refractory brick.

Optionally, the second prefabricated refractory brick is of a quadrangular frustum pyramid structure so as to be matched with the peripheral masonry layer.

Optionally, the second prefabricated refractory brick is divided into a plurality of combined blocks with equal length along the axial direction of the second prefabricated refractory brick.

Optionally, an end of the discharge port of the slag discharge channel extends to the outside of the furnace wall to form an extension section, the extension section comprises a circular channel, and a high-alumina refractory material is filled between the first prefabricated refractory brick in the circular channel and the circular channel.

Optionally, the radial cross section of the first prefabricated refractory brick in the circular channel along the through hole thereof is polygonal, and the length of the longest diagonal of the radial cross section is not greater than the length of the diameter of the circular channel.

In one embodiment, the first prefabricated brick in the pouring layer is quadrilateral, the first prefabricated brick in the extension section is octagonal, and the first prefabricated brick in the octagonal structure has a larger contact area with the high-alumina refractory material poured in the circular channel relative to the quadrilateral first prefabricated brick, and meanwhile, the alignment of the through holes is convenient to adjust.

Optionally, corundum refractory materials are filled among the first prefabricated refractory bricks, between the first prefabricated refractory bricks and the second prefabricated refractory bricks and between the second prefabricated refractory bricks and the masonry layer.

Benefits that can be produced by the present application include, but are not limited to:

1. the utility model provides a slag discharging structure for smelting reduction furnace, slag discharging structure establishes near the sediment-iron liquid level in iron bath district and/or heat transfer district, the separation of slag and molten iron of being convenient for, the separation mode is simple, and is efficient, high durability and convenient use, slag discharging structure builds to forming through prefabricated refractory brick, through-hole end to end in the refractory brick forms the sediment passageway, do not produce the damage to smelting reduction furnace equipment, the security performance is high, structural design is reasonable, sediment passageway slope sets up, it is more smooth and easy to make to arrange the sediment, it is higher to arrange sediment efficiency.

2. According to the slag discharging structure for the smelting reduction furnace, the first prefabricated refractory bricks are arranged through the convex ends and the concave ends, so that accurate positioning between the adjacent first prefabricated refractory bricks is facilitated, and the flatness of a slag discharging channel is facilitated; the second prefabricated refractory brick is in a quadrangular frustum pyramid structure so as to be matched with the peripheral masonry layer; the second prefabricated refractory brick is divided into a plurality of combined blocks with equal length along the axial direction, and the operability of processing and installation of the second prefabricated refractory brick is facilitated.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a partial side view of a smelting reduction furnace according to an embodiment of the present application;

FIG. 2 is a partial plan view of the smelting reduction furnace;

FIG. 3 is a schematic view of a slag discharge passage for the smelting reduction furnace;

FIG. 4 is a sectional view taken along line A-A and a sectional view taken along line B-B of FIG. 3;

FIG. 5 is a cross-sectional view of an extension structure;

FIG. 6 is a schematic view of a first prefabricated refractory brick;

fig. 7 is a front view (a), a plan view (b), and a side view (c) of a second prefabricated refractory brick;

list of parts and reference numerals:

11. an iron bath area 12, a heat exchange area 13, a pouring layer 14, a masonry layer,

2. a slag discharge channel 21, a feeding port 22 and a discharge port,

31. a first prefabricated refractory brick 311, a convex end 312, a concave end 313, a through hole 32, a second prefabricated refractory brick 321, a large end 322, a small end 323, a combination block,

4. the extension, 41, the circular channel,

5. high-alumina refractory material, 6, slag notch.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiment of the application discloses a slag discharging structure for a smelting reduction furnace, as shown in fig. 1-7, the smelting reduction furnace comprises an iron bath area 11 and a heat exchange area 12, the heat exchange area 12 is positioned above the iron bath area 11, a slag discharging structure is arranged on a furnace wall corresponding to the slag-iron liquid level of the iron bath area 11 and/or the heat exchange area 12, the slag discharging structure is formed by building prefabricated refractory bricks, the prefabricated refractory bricks are provided with through holes 313, the through holes 313 are sequentially connected end to form a slag discharging channel 2, the slag discharging channel 2 comprises a feeding port 21 communicated with the smelting reduction furnace and a discharging port 22 communicated with the outside, and the slag discharging channel 2 is inclined downwards by 0-45 degrees from the feeding port 21 to the discharging port 22.

Further, as shown in fig. 4 and 5, the section of the slag discharging channel 2 is a circular structure or an elliptical structure, so that the slag discharging structure is more stable and reliable, the strength is higher, and the operability of the slag discharging channel 2 with a cylindrical structure is higher than that of the slag discharging channels with other shapes during plugging.

As shown in fig. 1, the slag tapping structure is located near the slag-iron level in the iron bath zone 11 and/or the heat exchange zone 12. In the normal smelting process, the slag in the furnace is discharged through a slag hole 6 arranged on the furnace wall, the slag discharge channel 2 is in a closed state, only in the blowing-out process, the slag in the furnace needs to be discharged through the slag discharge channel 2, the molten iron and the slag have great differences in aspects such as physical and chemical aspects, such as the molten iron density, the slag melting point being higher than 1300 ℃, viscosity, molten iron fluidity and the like, and the molten iron has great differences in erosion and scouring of refractory materials of the furnace wall, the molten iron mainly corrodes physically, and the slag mainly corrodes chemically, so that the slag discharge structure separates and discharges the slag and the molten iron, and the slag discharge structure has great convenience for production operation and recycling of the slag and the iron. The slag discharging structure is positioned near the slag-iron liquid level of the iron bath area 11 and/or the heat exchange area 12, a slag hole 6, a slag discharging channel 2 and a front furnace molten iron communicating vessel (not shown in the figure) are arranged at different height positions of the furnace wall from top to bottom, the slag hole 6 discharges slag for 2 hours per time in a normal smelting period, and the slag discharging channel 2 discharges slag below the slag hole 6 in a furnace shutdown process.

As shown in fig. 1-3 and 6, the furnace wall of the smelting reduction furnace comprises a pouring layer 13 and a masonry layer 14 from outside to inside, the prefabricated refractory bricks comprise a first prefabricated refractory brick 31 and a second prefabricated refractory brick 32, two ends of the first prefabricated refractory brick 31 in the axial direction of a through hole 313 are respectively a convex end 311 and a concave end 312, the convex end 311 of the first prefabricated refractory brick 31 can be embedded into the concave end 312 of the adjacent first prefabricated refractory brick 31, so that accurate positioning between the adjacent first prefabricated refractory bricks 31 is facilitated, and meanwhile, the straightness of a slag discharge channel is facilitated, and when slag in the smelting reduction furnace passes through the through hole 313 of the first prefabricated refractory brick 31, the slag enters from the concave end 312 and exits from the convex end 311, so that the slag is discharged more smoothly; the second prefabricated refractory bricks 32 are axially divided into large end parts 321 and small end parts 322 along through holes 313 of the second prefabricated refractory bricks, the small end parts 322 are arranged towards the inner side of the furnace wall, the large end parts 321 are arranged towards the first prefabricated refractory bricks 31, the first prefabricated refractory bricks 31 are arranged in the pouring layer 13, and the second prefabricated refractory bricks 32 are arranged in the masonry layer 14.

In one embodiment, the second prefabricated refractory brick 32 has a rectangular frustum structure to fit the peripheral masonry layer 14; the second prefabricated refractory brick 32 is divided into a plurality of combined blocks 323 with equal length along the axial direction thereof, which is beneficial to the operability of processing and installation of the second prefabricated refractory brick 32, specifically, the second prefabricated refractory brick 32 can be equally divided into equal parts of the combined blocks 323 along the axial direction thereof, and referring to fig. 7, six equal parts of the combined blocks 323 can also be equally divided along the axial direction thereof from the large end surface of the quadrangular prism, such as the combined block 1 and the combined block 2 shown in fig. 7.

A protruding end 311 and a recessed end 312 are also provided at both ends of the second prefabricated refractory block 32. The accurate positioning between the first prefabricated refractory brick 31 or the second prefabricated refractory brick 32 adjacent to the first prefabricated refractory brick is facilitated, and meanwhile, the straightness of the slag discharge channel is facilitated.

In a preferred embodiment, as shown in fig. 1 and 2, the end of the discharge port 22 of the slag discharge channel 2 extends to the outside of the furnace wall to form an extension section 4, the extension section 4 comprises a circular channel 41, and the first refractory 5 is filled between the first prefabricated refractory bricks 31 in the circular channel 41 and the circular channel 41. The extension section 4 is arranged to avoid direct erosion of slag from the discharge port 22 to the outside of the furnace wall, and the circular channel 41 extends into the furnace wall and is fixedly connected with the furnace wall through pouring of the high-alumina refractory material 5, so that the fixing strength of the extension section 4 can be improved.

As shown in fig. 3 to 5, the radial cross section of the first prefabricated refractory brick 31 in the circular channel 41 is polygonal, and the length of the longest diagonal of the radial cross section of the first prefabricated refractory brick 31 is not greater than the diameter of the circular channel 41. In one embodiment, the first prefabricated refractory bricks 31 in the casting layer 13 are quadrilateral, the first prefabricated refractory bricks 31 in the extension section 4 are octagonal, and the first prefabricated refractory bricks 31 in the octagonal structure have a larger contact area with the high-alumina refractory 5 cast in the circular channel 41 relative to the quadrilateral first prefabricated bricks 31, and simultaneously facilitate the alignment adjustment of the through holes 313 of the first prefabricated refractory bricks 31.

Corundum refractory materials are poured among the first prefabricated refractory bricks, between the first prefabricated refractory bricks and the second prefabricated refractory bricks and between the second prefabricated refractory bricks and the masonry layer.

The composition and performance parameters of the high alumina refractory and corundum refractory are given in table 1 below:

the composition and performance parameters of the first and second prefabricated refractory bricks are as follows in table 2:

the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A slag discharging structure for a smelting reduction furnace comprises an iron bath area and a heat exchange area, wherein the iron bath area is located below the heat exchange area, and the slag discharging structure is characterized in that the furnace wall corresponding to the iron bath area and/or the heat exchange area is provided with the slag discharging structure, the slag discharging structure is formed by building prefabricated refractory bricks, through holes are formed in the prefabricated refractory bricks, the through holes are sequentially connected end to form a slag discharging channel, the slag discharging channel comprises a feeding port communicated with the smelting reduction furnace and a discharging port communicated with the outside, and the slag discharging channel is inclined downwards by 0-45 degrees from the feeding port to the discharging port.

2. The slag discharge structure for a smelting reduction furnace according to claim 1, wherein the slag discharge channel is inclined downward from the material inlet to the material outlet by 0 ° to 30 °.

3. The slag discharge structure for a smelting reduction furnace according to claim 1, wherein the cross-section of the slag discharge passage has a circular or elliptical configuration.

4. The slag discharge structure for a smelting reduction furnace according to claim 1, wherein the two ends of the prefabricated refractory bricks are respectively a convex end and a concave end, and the convex ends of the prefabricated refractory bricks can be inserted into the concave ends of the adjacent prefabricated refractory bricks.

5. The slag discharge structure for a smelting reduction furnace according to claim 1, wherein the furnace wall of the smelting reduction furnace comprises, from outside to inside, a casting layer and a masonry layer, the prefabricated refractory bricks comprise first prefabricated refractory bricks and second prefabricated refractory bricks, the first prefabricated refractory bricks are arranged in the casting layer, and the second prefabricated refractory bricks are arranged in the masonry layer;

the second prefabricated refractory brick is respectively provided with a large end part and a small end part along the axial two ends of the through hole, the small end part faces the inner side of the furnace wall, and the large end part faces the first prefabricated refractory brick.

6. The slag discharge structure for a smelting reduction furnace according to claim 5, wherein the second prefabricated refractory brick has a quadrangular frustum pyramid structure.

7. The slag discharging structure for a smelting reduction furnace according to claim 6, wherein the second prefabricated refractory brick is divided into a plurality of combined blocks of equal length along the axial direction thereof.

8. The slag discharging structure for the smelting reduction furnace according to claim 5, wherein the end of the discharging port of the slag discharging channel extends to the outside of the furnace wall to form an extension section, the extension section comprises a circular channel, and high-alumina refractory material is filled between the first prefabricated refractory brick and the circular channel in the circular channel.

9. The slag discharge structure for a smelting reduction furnace according to claim 8, wherein a radial cross section of the first prefabricated refractory brick in the circular passage along the through hole thereof is polygonal, and a longest diagonal length of the radial cross section is not more than a length of a diameter of the circular passage.

10. The slag discharge structure for a smelting reduction furnace according to claim 5, wherein corundum refractory is filled between the first prefabricated refractory bricks, between the first prefabricated refractory bricks and the second prefabricated refractory bricks, and between the second prefabricated refractory bricks and the masonry layer.

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