Blast furnace taphole

Abstract

The utility model belongs to the technical field of blast furnace equipment, and relates to a blast furnace iron notch, which comprises a first sleeve, a second sleeve, a third sleeve and a fourth sleeve, the second sleeve is connected to the inner wall of the blast furnace, and a second annular groove is formed in the inner wall of the second sleeve; the iron notch combination brick is at least arranged in the first sleeve and the second sleeve, and an iron notch channel communicating the inside and the outside of the blast furnace is arranged in the iron notch combination brick; and the grouting material is arranged in gaps between the inner walls of the first sleeve and the second sleeve and the iron notch combined bricks. The iron notch combination bricks and the iron notch frame are fixedly connected in a staggered mode, a gap between the iron notch combination bricks and the iron notch frame is effectively blocked, and therefore gas can be better blocked, the gas leakage time of the iron notch part is delayed, the gas fire spurting degree is reduced, the tapping safety is improved, and the service life of the iron notch is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace equipment, and specifically relates to a blast furnace taphole. Background Art

[0002] The blast furnace is a commonly used device for mineral smelting. The blast furnace ironmaking technology has the advantages of good economic indicators, simple process, large production volume, high labor productivity, and low energy consumption. The iron produced by this method accounts for the vast majority of the world's total iron production. During blast furnace production, iron ore, coke, and flux (limestone) for slag making are charged from the top of the furnace, and preheated air is blown in from the tuyeres. At high temperatures, carbon in the coke burns with oxygen in the blown-in air to generate carbon monoxide and hydrogen. During the upward movement in the furnace, oxygen in the iron ore is removed, thereby reducing to obtain iron, and the molten iron is discharged from the taphole. The unreduced impurities in the iron ore combine with fluxes such as limestone to form slag, which is discharged from the slag notch. The generated gas is discharged from the top of the furnace and, after dust removal, is used as fuel for hot blast stoves, heating furnaces, coke ovens, boilers, etc. The main products of blast furnace smelting are pig iron, as well as by-products such as blast furnace slag and blast furnace gas.

[0003] The blast furnace taphole is located at the lower edge of the hearth. Its working environment is harsh, and it is eroded and scoured by high-temperature slag and iron for a long time. The blast furnace taphole area is one of the weakest links in the hearth. The quality of the taphole work not only affects the normal production of the blast furnace but also shortens the service life of the blast furnace.

[0004] In the prior art, the inner wall of the blast furnace taphole frame is smooth. During the construction of the blast furnace taphole frame, taphole composite bricks are built in the taphole frame, and the gaps between the taphole composite bricks and the taphole frame are sealed with grouting material. However, the combination of the grouting material with the taphole frame and the composite bricks is not tight enough. Due to the complex structure near the taphole, there are many gaps. These gaps allow the gas in the blast furnace to overflow from the taphole through the gaps under the action of high pressure after the blast furnace is put into production. Over time, a gas passage will be formed, affecting the operation of the operators and having a very great impact on the long life of the blast furnace. Summary of the Utility Model

[0005]

Technical Problem

[0006] The utility model is a refined design of the structure for preventing gas leakage at the blast furnace taphole, which can better block gas, delay the gas leakage time at the taphole part, reduce the degree of gas flashover, improve the safety of tapping, extend the service life of the taphole, improve the productivity of blast furnace tapping, reduce the cost of cooling stave replacement, improve the service life of the blast furnace, reduce the number of blast furnace outages, and has great reference and guiding value for the design of the blast furnace taphole frame.

[0007]

Technical Solution

[0008] A blast furnace taphole, comprising:

[0009] The first sleeve is connected to the outer wall of the blast furnace, and a first annular groove is provided on its inner wall;

[0010] The second sleeve is connected to the inner wall of the blast furnace, and a second annular groove is provided on its inner wall;

[0011] The tuyere composite brick is at least arranged in the first sleeve and the second sleeve, and a tuyere channel communicating inside and outside the blast furnace is arranged in the tuyere composite brick;

[0012] The grouting material is arranged at the gap between the inner walls of the first sleeve and the second sleeve and the tuyere composite brick.

[0013] Optionally, the second sleeve extends into the blast furnace shell to a position not exceeding the cooling stave.

[0014] Optionally, the first sleeve and the second sleeve are coaxial.

[0015] Optionally, the diameter of the first sleeve is greater than or equal to the diameter of the second sleeve.

[0016] Optionally, the tuyere channel is in a form that gradually rises from the furnace interior to the furnace exterior.

[0017] Optionally, the diameter of the tuyere channel is in a two-stage stepped shape, and the diameter towards the furnace exterior is larger.

[0018] Optionally, the depths of the first annular groove and the second annular groove are 8 - 15 mm, and the widths are 20 - 40 mm.

[0019] Optionally, the grouting material and the blast furnace cooling stave are connected as a whole.

[0020]

Beneficial effects

[0021] For the blast furnace tuyere of the present application, by providing annular grooves on the inner walls of the first sleeve and the second sleeve, during the construction process, when grouting the gap between the tuyere frame and the tuyere composite brick, the annular grooves are also grouted. In this way, a mutually interlaced fixed connection relationship can be formed between the tuyere composite brick and the tuyere frame. The grouting material can reliably combine the first sleeve and the second sleeve with the tuyere composite brick, effectively sealing the gap therebetween, thereby better sealing the gas, delaying the gas leakage time at the tuyere part, reducing the degree of gas flaring, improving the tapping safety, extending the service life of the tuyere, increasing the tapping productivity of the blast furnace, reducing the cost of replacing the cooling stave, increasing the service life of the blast furnace, reducing the number of blast furnace outages, and having great reference and guiding value for the design of the blast furnace tuyere frame. Description of the drawings

[0022] By describing its embodiments in combination with the following drawings, the above features and technical advantages of the present utility model will become clearer and easier to understand.

[0023] Figure 1 It is a horizontal sectional view of the blast furnace tuyere of the embodiment of the present utility model.

[0024] Figure 2 It is a vertical sectional view of the blast furnace tuyere of the embodiment of the present utility model.

[0025] Figure 3 It is a schematic diagram of the third annular groove of the embodiment of the present utility model.

[0026] In the drawings: 1, blast furnace shell; 2, tuyere frame accessory; 3, first sleeve; 4, first annular groove; 5, second sleeve; 6, second annular groove; 7, grouting material; 8, tuyere combined brick; 81, third annular groove; 9, tuyere channel; 10, cooling stave. Detailed implementation manners

[0027] The embodiments of the present utility model will be described below with reference to the drawings. Those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways or combinations thereof without departing from the spirit and scope of the present utility model. Therefore, the drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims. In addition, in this specification, the drawings are not drawn to scale, and the same reference numerals represent the same parts.

[0028] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that they are connected to each other and the relative position relationship after connection remains unchanged. The orientation terms mentioned in the embodiments of the present application, such as "inside" and "outside", are only with reference to the direction of the drawings. Therefore, the orientation terms used are for better and clearer illustration and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0029] The embodiments of the present application provide a blast furnace tuyere that can prevent gas leakage. The blast furnace tuyere is to open an annular groove in the existing blast furnace tuyere frame, so that when grouting the gap between the tuyere frame and the tuyere combined brick during construction, the annular groove is grouted together. In this way, a fixed connection relationship of mutual intersection can be formed between the tuyere combined brick and the tuyere frame, effectively avoiding gas leakage, improving the safety of tapping, extending the service life of the tuyere, increasing the service life of the blast furnace, reducing the number of blast furnace outages, improving the productivity of blast furnace tapping, and having great reference and guiding value for the design of the blast furnace tuyere frame.

[0030] The embodiments of the present application provide a blast furnace tuyere. Please refer toFigure 1 , the blast furnace taphole includes a first casing 3, a first annular groove 4, a second casing 5, a second annular groove 6, grouting material 7, a taphole composite brick 8, and a taphole passage 9.

[0031] Among them, the second casing 5 extends into the blast furnace shell and is fixedly welded to the blast furnace shell. Specifically, both the inner and outer sides of the end in contact with the blast furnace shell can be fixedly welded to the blast furnace shell to enhance the connection strength of the taphole frame. Particularly, the second casing 5 extends into the blast furnace shell to the position of the cooling wall 10.

[0032] The first casing 3 is outside the blast furnace, and one end thereof is fixedly welded to the blast furnace shell 1. Specifically, both the inner and outer sides of the end in contact with the blast furnace shell can be fixedly welded to the blast furnace shell to enhance the connection strength of the taphole frame. The first casing 3 and the second casing 5 together serve as the taphole frame, and the other end of the first casing 3 is connected to the taphole frame accessory 2.

[0033] In some embodiments, the first casing 3 and the second casing 5 can be arranged coaxially or substantially coaxially. For example, Figure 1 in, the first casing 3 and the second casing 5 are arranged substantially coaxially, and the diameters can be substantially equal, except that one is arranged inside the blast furnace shell and the other is arranged outside the blast furnace shell. Of course, they can also be unequal, and the diameter of the first casing 3 is larger than the diameter of the second casing 5. For example, Figure 1 in, the diameter of the first casing 3 is larger than the diameter of the second casing 5. Since the molten iron flows out from this taphole, the diameter of the first casing 3 should not be smaller than the diameter of the second casing 5.

[0034] The taphole composite brick 8 is at least laid on the inner sides of the first casing 3 and the second casing 5. In some embodiments, the taphole composite brick 8 can be cast in a prefabricated module in the factory and assembled in the taphole frame. It can also be in the form of on-site masonry. For example, Figure 1 in, a part of the taphole composite brick 8 is laid on the inner side of the first casing 3, a part of the taphole composite brick 8 is laid on the inner side of the second casing 5, and there is also a part that exceeds the second casing 5 and surrounds a part of the area of the cooling wall 10.

[0035] A taphole passage 9 communicating the inside and outside of the furnace is provided in the taphole composite brick 8. Exemplarily, the taphole passage 9 is in a form that gradually rises from the furnace interior to the furnace exterior. And the diameter of the taphole passage 9 is in a two-stage stepped shape, with the diameter towards the furnace exterior being larger.

[0036] On the inner wall of the first casing 3, at least one circle of first annular grooves 4 is provided. For example, one circle of first annular grooves 4 can be provided, or two circles or multiple circles of first annular grooves 4 can be provided. For example, Figure 1 in, two circles of first annular grooves 4 are provided on the inner wall of the first casing 3.

[0037] Similarly, on the inner wall of the second sleeve 5, at least one circle of second annular grooves 6 can also be provided. For example, one circle of second annular grooves 6 can be provided, or two circles or multiple circles of second annular grooves 6 can be provided. As Figure 1 shown in

[0038] Exemplarily, the depth of the first annular groove and the second annular groove is 8 - 15 mm, and the width is 20 - 40 mm. Preferably, the depth is 10 mm and the width is 20 mm.

[0039] There is a gap between the inner sides of the first sleeve 3 and the second sleeve 5 and the tuyere composite brick 8. Grouting material 7 is poured into this gap to seal the gap. Due to the existence of the first annular groove 4 and the second annular groove 6, the grouting material 7 will surely flow into the annular grooves. In this way, the first annular groove 4 on the first sleeve 3 and the second annular groove 6 on the second sleeve 5 are also filled with the grouting material 7. The grouting material forms an interlaced fixed connection relationship with the tuyere frame, increasing the contact area between the grouting material and the tuyere frame, making the first sleeve 3 and the second sleeve 5 and the tuyere composite brick 8 be reliably fixed and connected as a whole, and effectively sealing the gap. As Figure 1 shown in

[0040] Furthermore, on the tuyere composite brick 8, annular grooves are also provided. Specifically, please refer to Figure 3 shown in

[0041] Multiple third annular grooves 81 are provided on the outer side of the tuyere composite brick 8. When pouring the grouting material 7, the grouting material 7 also enters the third annular grooves 81 at the same time. The grouting material forms an interlaced fixed connection relationship with the tuyere composite brick 8, increasing the contact area between the grouting material and the tuyere composite brick 8, making the first sleeve 3 and the second sleeve 5 and the tuyere composite brick 8 be more reliably fixed and connected as a whole, and effectively sealing the gap.

[0042] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A blast furnace iron mouth, characterized in that: include: A first sleeve is connected to the outer wall of the blast furnace and has a first annular groove on its inner wall; A second sleeve is connected to the inner wall of the blast furnace and has a second annular groove on its inner wall; An iron mouth combined brick is at least arranged in the first sleeve and the second sleeve, and an iron mouth passage connecting the inside and the outside of the blast furnace is arranged in the iron mouth combined brick; The grouting material is arranged in the gap between the inner wall of the first sleeve and the second sleeve and the iron mouth combined brick.

2. The blast furnace iron mouth according to claim 1, characterized in that: The second sleeve extends into the blast furnace shell to a position not exceeding the cooling wall.

3. The blast furnace iron mouth according to claim 1, characterized in that: The first sleeve and the second sleeve are coaxial.

4. The blast furnace iron mouth according to claim 1, characterized in that: The diameter of the first sleeve is greater than or equal to the diameter of the second sleeve.

5. The blast furnace iron mouth according to claim 1, characterized in that: The iron mouth passage is in a form of gradually rising from the furnace to the outside of the furnace.

6. The blast furnace iron mouth according to claim 5, characterized in that: The diameter of the iron mouth passage is in a two-stage stepped shape, and the diameter is larger toward the outside of the furnace.

7. The blast furnace iron mouth according to claim 1, characterized in that: The first annular groove and the second annular groove have a depth of 8-15 mm and a width of 20-40 mm.

8. The blast furnace iron mouth according to claim 1, characterized in that: The grouting material and the blast furnace cooling wall are connected as a whole.

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