CN213680768U - Residual iron notch prefabricated refractory brick for smelting reduction furnace - Google Patents
Residual iron notch prefabricated refractory brick for smelting reduction furnace Download PDFInfo
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- CN213680768U CN213680768U CN202021165709.4U CN202021165709U CN213680768U CN 213680768 U CN213680768 U CN 213680768U CN 202021165709 U CN202021165709 U CN 202021165709U CN 213680768 U CN213680768 U CN 213680768U
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Abstract
The utility model provides a prefabricated resistant firebrick of incomplete indisputable mouth for melting reduction furnace, relates to molten iron eduction gear technical field, includes the resistant firebrick group of building by the refractory material of pouring of low cement, has seted up the molten iron passageway on the resistant firebrick group, and the molten iron passageway sets up 0-30 with horizontal plane slope, and resistant firebrick group sets up in the furnace body, and the furnace body is equipped with in advance to be used for filling resistant firebrick group's installation passageway, and the installation passageway is linked together external and furnace body inner chamber. The utility model solves the problems that the discharging mode of the blast furnace scrap iron hole in the traditional technology is time-consuming and labor-consuming and causes permanent damage to the furnace body; pores exist in the masonry of the refractory bricks, so that molten iron is drilled into the gaps, and the mechanical strength and the erosion resistance of the whole masonry of the refractory bricks are reduced; the molten iron cannot be completely discharged due to the limitation of angles and shapes; and low stability and poor workability due to masonry specification limitations.
Description
Technical Field
The utility model relates to a molten iron eduction gear technical field, concretely relates to prefabricated resistant firebrick of incomplete iron notch for melting reduction furnace.
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 reactions; 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; therefore, 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 recycling the molten iron stored in the furnace when the SRV furnace is safely stopped, so that the residual molten iron is prevented from being solidified in the furnace.
In the existing blast furnace residual iron discharging scheme, the position of a residual iron hole is determined according to the furnace age, the temperature of a furnace base, the temperature difference of cooling wall water, the temperature of upper and lower furnace shells of a residual iron layer and the like, and holes are formed in the position of the residual iron layer. 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.
The intellectual property office of China discloses a patent with application number CN99245731. X, which comprises a brick body and is characterized in that: the front surface and the back surface of the brick body are trapezoidal, the upper surface, the lower surface, the left surface and the right surface are rectangular, the front surface and the back surface, the left surface and the right surface are respectively symmetrical, and the area of the lower surface is smaller than that of the upper surface. Because the utility model discloses a structural design as above for the work lining is difficult for falling the brick and hangs the sediment in the use, and life is longer, is difficult for causing the iron leakage accident of can wearing, can reduction in production cost, also makes simultaneously to build by laying bricks or stones work more labour saving and time saving, and the material is less.
With the use of the existing mode, the defects of the technology are gradually exposed, and the following problems often occur;
firstly, the scheme of discharging the residual iron hole of the blast furnace needs to determine the position of the residual iron hole according to the position condition of the residual iron layer in the furnace before blowing out, then adopts a mechanical mode to drill and cut the position of the residual iron layer, greatly damages the original mechanical structure of the blast furnace, wastes time and energy, and has great risk factors.
Secondly, as the position of the residual iron hole is surrounded by molten iron for a long time, a gap exists when refractory bricks are built, so that the molten iron is drilled into the gap, and the using effect of the refractory bricks is influenced; meanwhile, the effects of mechanical strength, erosion resistance and the like of the whole masonry of the refractory bricks are reduced.
Thirdly, the construction specification is limited by processing limitation, the construction specification can only be a rectangular channel, the stability of the circular channel cannot be achieved, and the rectangular channel has no operability of the circular channel during plugging.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a refractory brick prepared from a scrap iron hole for a smelting reduction furnace, which is used for solving the problems that the discharge mode of the scrap iron hole of the blast furnace in the traditional technology is time-consuming and labor-consuming and causes permanent damage to the furnace body; pores exist in the masonry of the refractory bricks, so that molten iron is drilled into the gaps, and the mechanical strength and the erosion resistance of the whole masonry of the refractory bricks are reduced; and the problems of low stability and poor operability caused by that the building specification can only be a rectangular channel.
In order to achieve the above object, the utility model provides a following technical scheme:
a scrap iron notch prefabricated refractory brick for a smelting reduction furnace comprises a refractory brick group made of low-cement refractory pouring materials, wherein a molten iron channel is formed in the refractory brick group, the molten iron channel is inclined by 0-30 degrees with the horizontal plane, the refractory brick group is arranged in a furnace body, an installation channel used for filling the refractory brick group is arranged in the furnace body in advance, and the outside is communicated with the inner cavity of the furnace body through the installation channel.
As an optimized scheme, the firebrick group comprises an internal firebrick arranged in a cuboid and an external firebrick arranged in an octagon.
As an optimized scheme, a steel pipe is welded on the outer wall of the furnace body, the steel pipe is communicated with the installation channel, and the external refractory bricks are arranged in the steel pipe.
As an optimized scheme, a high-alumina pouring fire-resistant layer is filled between the external refractory brick and the inner wall of the steel pipe.
As an optimized scheme, a residual iron notch refractory brick is further paved on the inner bottom surface of the furnace body, a molten iron buffer groove is formed in the residual iron notch refractory brick, and the molten iron buffer groove is communicated with the molten iron channel.
As an optimized scheme, the internal refractory brick and the external refractory brick are both provided with two thread grooves, and are in threaded connection with two thread sleeves through the thread grooves.
As an optimized proposal, a plurality of the built-in refractory bricks are arranged in parallel, and corundum self-flowing pouring refractory material layers are arranged between the adjacent built-in refractory bricks and between the built-in refractory bricks and the external refractory bricks.
As an optimized scheme, the length of the built-in refractory brick is 400-.
As an optimized scheme, the diameter of the installation channel is 600-1200 mm.
As an optimized scheme, the diameter of the molten iron channel is 80-180 mm.
As an optimized scheme, the radius of the molten iron buffer groove is 400-800 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the method is used for reserving the channel of the residual iron opening in the refractory material, can be repeatedly recycled, is simple and convenient because the opening machine is used for opening the hole, and solves the problems that the refractory material at the position of the furnace shell and the residual iron opening of the blast furnace in the traditional technology is damaged by destructive property, can be used only once, is complex and complicated in operation process and has high risk coefficient; the prefabricated circular molten iron channel is adopted, so that the channel can be plugged and holed by using a filler, meanwhile, the circular shape has better stability and strength, the prefabricated refractory brick has strong erosion resistance, and the problems that the refractory brick in the traditional technology is built, the mechanical strength and the molten iron erosion resistance of the molten iron channel are difficult to ensure, molten iron is easy to drill into a refractory material from a gap, the refractory material is denatured, the erosion is accelerated, a furnace shell is burnt through, the built molten iron channel is difficult to plug during use, and the operability is poor are solved; simple and convenient operation and control, easy large-scale manufacture and installation and wide application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the refractory brick of the present invention;
FIG. 3 is a schematic structural view of the external refractory brick of the present invention;
in the figure: 1-building refractory bricks; 2-external firebricks; 3-a molten iron channel; 4-a steel pipe; 5-a molten iron buffer tank; 6-residual iron mouth refractory brick; 7-furnace body; 8-corundum self-flow casting refractory material layer; 9-thread groove.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 3, the taphole precast refractory brick for the smelting reduction furnace comprises a refractory brick group made of low cement refractory casting material, wherein the refractory brick group is provided with a molten iron channel 3, the molten iron channel 3 is inclined at 0-30 degrees with respect to the horizontal plane, the refractory brick group is arranged in a furnace body 7, the furnace body 7 is provided with an installation channel for filling the refractory brick group in advance, and the installation channel connects the outside with the inner cavity of the furnace body 7.
The firebrick group is including being the built-in firebrick 1 of cuboid setting and being the external firebrick 2 of the octagon setting.
The outer wall of the furnace body 7 is welded with a steel pipe 4, the steel pipe 4 is communicated with the installation channel, and the external refractory bricks 2 are arranged in the steel pipe 4.
And a high-alumina pouring refractory layer is filled between the external refractory brick 2 and the inner wall of the steel pipe 4.
The inner bottom surface of the furnace body 7 is further paved with residual iron notch refractory bricks 6, the residual iron notch refractory bricks 6 are provided with molten iron buffer slots 5, and the molten iron buffer slots 5 are communicated with the molten iron channel 3.
The built-in refractory brick 1 and the external refractory brick 2 are both provided with two thread grooves 9 and are in threaded connection with two thread sleeves through the thread grooves 9.
The internal refractory bricks 1 are arranged in parallel, and self-flowing pouring refractory material layers 8 are arranged between the adjacent internal refractory bricks 1 and between the internal refractory bricks 1 and the external refractory bricks 2.
The length of the built-in refractory bricks is 400-1000mm, the width is 400-800mm and the height is 400-1000 mm.
The diameter of the installation channel is 600-1200 mm.
The diameter of the molten iron channel is 80-180 mm.
The radius of the molten iron buffer tank 5 is 400-800 mm.
The periphery in the furnace body 7 is poured with refractory materials.
1. The built-in refractory brick 1 is a cuboid with 500mm x 525mm, a molten iron channel 3 is arranged along the central line of the length direction, the diameter of the molten iron channel 3 is 80-180mm, and the channel can be designed with an inclination angle of 0-30 degrees, so that the molten iron can flow out under the action of gravity;
2. the built-in firebricks 1 are provided with 2 phi 25mm multiplied by 80mm threaded sleeves for hoisting the prefabricated firebricks, and the threaded sleeves are made of Q235 materials; the hexagonal bolt with the specification of phi 25mm multiplied by 100mm is used for hoisting;
3. the threaded sleeves are symmetrically distributed and are positioned in the middle;
4. the refractory brick 6 of the residual iron mouth in the furnace is provided with a molten iron buffer groove 5, the section of the molten iron buffer groove 5 is semicircular, so that molten iron can be conveniently collected and flows, the bottom surface of the molten iron buffer groove 5 is flush with the lower end of the molten iron channel 3 in transition, the radius of the buffer groove is 400 plus 800mm, and the circumference of the buffer groove is flush with the refractory material at the bottom of the furnace;
5. the external refractory brick 2 is of an octagonal structure, a molten iron channel 3 is arranged along the central line of the length direction, the diameter of the molten iron channel 3 is 80-180mm, and the channel can be designed with an inclination angle of 0-30 degrees; 2 phi 25mm multiplied by 80mm thread sleeves are arranged for hoisting prefabricated refractory bricks;
6. using prefabricated refractory bricks, wherein refractory materials in a melting reduction furnace comprise a permanent lining and a working lining, wherein the permanent lining is formed by casting, and the working lining is a refractory brick group; in the permanent lining pouring process, a phi 600mm-1200mm installation channel is reserved, the position of a furnace shell where the installation channel is located is extended by a steel pipe 4, the steel pipe 4 and the furnace shell are welded and fixed, and compared with a rectangular channel, the circular channel is better in mechanical stress and structural stability;
7. refractory brick group's installation is used, and the prefabricated resistant firebrick of incomplete indisputable mouth is formed by the polylith equipment, and middle molten iron passageway 3 is a cylindrical passageway, must guarantee the straight line centering nature of this passageway: firstly, the external refractory bricks 2 are arranged in the channel of the steel pipe 4, the external refractory bricks 2 are of an octagonal structure, and compared with a tetragonal structure, the structure is better matched with a circular channel and can fill the steel channel to a greater extent; meanwhile, compared with a cylindrical structure, the octagonal structure is easier to adjust the structure of the prefabricated refractory brick, and the straight line centering of the middle molten iron channel 3 is facilitated; the external refractory bricks 2 and the periphery of the steel channel are filled and fixed by high-alumina pouring refractory materials;
8. installing the internal refractory bricks 1, screwing the internal refractory bricks into the threaded sleeves by using hexagon bolts, fixing the lifting device with the bolts, lifting the internal refractory bricks 1 to the position of the residual iron hole in the furnace, adjusting the height and the levelness of the refractory bricks below the position of the internal refractory bricks 1, and ensuring that the middle molten iron channel 3 is aligned with the external refractory bricks 2 when the internal refractory bricks 1 are installed; in order to ensure the contact between the prefabricated refractory bricks, corundum self-flow casting refractory materials are coated in the middle of the prefabricated parts, the coating thickness is less than 1mm, gaps between the prefabricated parts are reduced to the maximum extent, and molten iron is prevented from entering the gaps;
9. the prefabricated refractory brick comprises the following materials:
10. the blocking mode of the molten iron channel is as follows:
plugging the molten iron channel, setting a working area, a filling area and a sealing area, and using stemming fire-resistant material
11. Other refractory materials:
12. length specification of refractory bricks: the prefabricated refractory bricks can be set to be 300-800mm in length, and different thicknesses and combined quantities of the prefabricated residual iron mouth bricks are selected according to the building thickness of refractory materials of the smelting reduction furnace, so that the centering property of the molten iron channel is ensured.
The refractory brick is integrally made and molded by adopting a low-cement refractory material, can be stably used in a molten iron temperature environment of 1600 ℃, and ensures the stability of the refractory material at the position of a residual iron notch; the residual iron channel is designed horizontally or obliquely at an angle of 0-30 degrees, so that free flow of molten iron is ensured; the outer side is matched with the round steel sleeve through an octagon.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (10)
1. A refractory brick prepared from a residual iron notch for a smelting reduction furnace is characterized in that: the refractory brick group is characterized by comprising a refractory brick group made of low-cement refractory pouring materials, wherein a molten iron channel (3) is formed in the refractory brick group, the molten iron channel (3) is inclined by 0-30 degrees with the horizontal plane, the refractory brick group is arranged in a furnace body (7), the furnace body (7) is provided with an installation channel for filling the refractory brick group, and the outside is communicated with the inner cavity of the furnace body (7) through the installation channel.
2. The taphole precast refractory brick for a smelting reduction furnace according to claim 1, characterized by: the firebrick group is including being built-in firebrick (1) that the cuboid set up and being external firebrick (2) that the octagon set up.
3. The taphole precast refractory brick for a smelting reduction furnace according to claim 2, characterized in that: the steel pipe (4) is welded on the outer wall of the furnace body (7), the steel pipe (4) is communicated with the installation channel, and the external refractory bricks (2) are arranged in the steel pipe (4).
4. The taphole precast refractory brick for a smelting reduction furnace according to claim 3, characterized by: and a high-alumina pouring refractory layer is filled between the external refractory brick (2) and the inner wall of the steel pipe (4).
5. The taphole precast refractory brick for a smelting reduction furnace according to claim 1, characterized by: the iron notch furnace is characterized in that an iron notch refractory brick (6) is further laid on the inner bottom surface of the furnace body (7), a molten iron buffer groove (5) is formed in the iron notch refractory brick (6), and the molten iron buffer groove (5) is communicated with the molten iron channel (3).
6. The taphole precast refractory brick for a smelting reduction furnace according to claim 2, characterized in that: the built-in refractory brick (1) and the external refractory brick (2) are both provided with two thread grooves (9) and are in threaded connection with two thread sleeves through the thread grooves (9).
7. The taphole precast refractory brick for a smelting reduction furnace according to claim 2, characterized in that: the self-pouring refractory material is characterized in that a plurality of built-in refractory bricks (1) are arranged in parallel, and self-pouring refractory material layers (8) are arranged between adjacent built-in refractory bricks (1) and between the built-in refractory bricks (1) and the external refractory bricks (2).
8. The taphole precast refractory brick for a smelting reduction furnace according to claim 2, characterized in that: the length of the built-in refractory brick (1) is 400-1000mm, the width is 400-800mm, and the height is 400-1000 mm.
9. The taphole precast refractory brick for a smelting reduction furnace according to claim 1, characterized by: the diameter of the installation channel is 600-1200 mm.
10. The taphole precast refractory brick for a smelting reduction furnace according to claim 1, characterized by: the diameter of the molten iron channel (3) is 80-180 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021165709.4U CN213680768U (en) | 2020-06-22 | 2020-06-22 | Residual iron notch prefabricated refractory brick for smelting reduction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021165709.4U CN213680768U (en) | 2020-06-22 | 2020-06-22 | Residual iron notch prefabricated refractory brick for smelting reduction furnace |
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| CN213680768U true CN213680768U (en) | 2021-07-13 |
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| CN202021165709.4U Active CN213680768U (en) | 2020-06-22 | 2020-06-22 | Residual iron notch prefabricated refractory brick for smelting reduction furnace |
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- 2020-06-22 CN CN202021165709.4U patent/CN213680768U/en active Active
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