CN117070683A - Device for stabilizing blast furnace slag skin - Google Patents

Abstract

The application discloses a device for stabilizing blast furnace slag crust, which comprises a cooling piece, wherein the cooling piece is arranged between a furnace belly cooling wall and a tuyere cooling wall, the cooling piece stretches into a furnace belly area, a wear-resistant refractory layer is arranged outside the furnace belly area, and the cooling piece is used for supporting the root of the slag crust.

Description

Device for stabilizing blast furnace slag skin

Technical Field

The application belongs to the technical field of blast furnace smelting, and particularly relates to a device for stabilizing blast furnace slag skin.

Background

The requirements for cooling walls are increasing with the increase of the utilization coefficient in the production of the blast furnace. In actual production, a plurality of furnace belly cooling walls are worn and leaked, so that the blast furnace is forced to be in damping down treatment. The damage of the cooling wall of the furnace hearth and the selection of the angle of the furnace hearth are greatly related to whether the slag crust is stable or not.

The design and selection of the furnace cavity angle of the blast furnace are very important: when the angle of the furnace belly is overlarge, slag skin is not easy to form due to the scouring of edge gas and the overlarge angle of the furnace belly, namely the root position of the slag skin is unstable; b, when the furnace belly angle is too small, forming too thick slag skin, so that furnace burden is unstable to drop; c there is an optimum flank angle and there is an optimum match between the height and angle of the flank. Practice has shown that the progressive breakage of the brick lining in the hearth zone is not related to the operation of the blast furnace, but also to the internal form of the operation of the hearth zone.

In summary, when the blast furnace of the prior art is produced, the cooling wall of the furnace belly is damaged and falls off along with the increase of the service life, so that the angle of the furnace belly is unstable, and the slag skin of the molten belt is not stable enough.

Disclosure of Invention

The embodiment of the application provides a device for stabilizing blast furnace slag skin, which strengthens the cooling degree of a furnace belly region by inserting a cooling piece between a furnace belly cooling wall and a tuyere cooling wall, reduces the abrasion of the cooling piece on the cooling wall, stabilizes the angle of a furnace belly angle, supports the root of the slag skin, and ensures that the thickness of the slag skin formed by a melting zone is moderate to a certain extent, thereby ensuring that furnace burden is more stable in descending and realizing stable smelting in the blast furnace.

Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.

According to the embodiment of the application, the device for stabilizing the blast furnace slag crust comprises a cooling piece, wherein the cooling piece is arranged between a furnace belly cooling wall and a tuyere cooling wall, the cooling piece stretches into a furnace belly area, a wear-resistant refractory layer is arranged outside the furnace belly area and inserted into the furnace belly area, and the cooling piece is used for supporting the root of the slag crust.

In some embodiments of the application, the cooling part is of a hollow tubular structure, a water inlet end and a water outlet end are arranged outside the cooling part on the cooling wall of the furnace belly, the water inlet end is communicated with a water supply tank, a high-pressure water pump is arranged on a pipeline between the water supply tank and the water inlet end, the water speed of water fed into the cooling part by the high-pressure water pump is more than 2m/s, and the water temperature in the cooling part is lower than 35 ℃.

In some embodiments of the application, the length of the cooling element extending into the belly region is 40mm.

In some embodiments of the application, the water velocity of the water fed into the cooling member by the high pressure water pump is 2m/s or more.

In some embodiments of the application, the wear resistant refractory layer is a braze alloy layer.

In some embodiments of the application, the cooling member is formed from a thermally conductive material.

In some embodiments of the application, the cooling elements comprise a plurality of cooling elements which are uniformly distributed between the whole blast furnace belly cooling wall and the tuyere cooling wall along the circumferential direction of the blast furnace.

In some embodiments of the application, the cooling element is a cooling bar or a cooling plate.

In some embodiments of the application, a flowmeter is further arranged between the water inlet end of the cooling piece and the high-pressure water pump.

In some embodiments of the application, one water supply tank is connected in the plurality of cooling elements.

In some embodiments of the application, the cooling element is fixed with the furnace belly cooling wall and the tuyere cooling wall by adopting bricks.

According to the application, compared with a mode of arranging a furnace belly brick lining which is easy to fall off or a mode of embedding a cooling pipeline in the cooling wall, the cooling piece is inserted between the furnace belly cooling wall and the tuyere cooling wall, so that slag skin of a molten zone in the blast furnace can have higher cooling strength, the cooling piece in a furnace belly area is difficult to wear or fall off compared with the mode of arranging the furnace belly brick lining, the angle of a furnace belly angle is more stable, and in addition, the slag skin layer in the blast furnace is inserted into the cooling piece to form a certain supporting effect on the slag skin layer, so that compared with a mode of embedding the cooling pipeline in the cooling wall and no supporting in the cooling wall, the slag skin thickness of the molten zone is moderate, the furnace burden is more stable to realize stable smelting in the blast furnace, meanwhile, the slag skin is prevented from falling off, the slag skin is stably formed, the reinforced cooling effect is formed on the furnace belly, and the service life of the cooling wall and the service life of the tuyere on the tuyere cooling wall are prolonged.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

referring to FIG. 1, a schematic diagram of a stave structure in an actual production process is shown;

referring to fig. 2, a schematic structural view of an apparatus for stabilizing slag skin of a blast furnace is shown.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.

In order to better understand the background of the present inventors in the course of proposing the present application, a brief description will be given below with reference to fig. 1.

Referring to fig. 1, there is shown a schematic structural view of a stave in actual production, and in the smelting process of a blast furnace, the following conditions are often encountered: since the blast furnace belly cooling wall 2 and the tuyere cooling wall 3 have a certain belly brick lining when the blast furnace is newly opened, the brick lining on the cooling wall gradually disappears along with the production of the blast furnace, slag skin is required to be formed on the hot surface of the belly cooling wall 2 by the copper cooling wall in the production process of the blast furnace, the damage degree of the brick lining is shown from A to B to C in fig. 1 along with the time period, after the belly brick lining is worn, the adhesive starts to be damaged after the belly brick lining is worn, and finally, only the stable adhesive at the bottommost end of the inner wall of the belly is remained, the angle of the belly angle is smaller and smaller in the three damage processes from A to B to C, and the too thick slag skin is formed at the too small belly angle, so that the reduction of the furnace burden is unstable.

Referring to fig. 2, there is shown a schematic structural view of a device for stabilizing blast furnace slag, according to an embodiment of the present application, there is provided a device for stabilizing blast furnace slag, comprising a cooling element 1, wherein the cooling element 1 is disposed between a belly cooling wall 2 and a tuyere cooling wall 3, the cooling element 1 extends into a belly region 4, an abrasion-resistant refractory layer is disposed outside the belly region 4, and the cooling element 1 is disposed to support a root portion of slag.

It should be understood that the cooling element 1 is arranged on the inner wall of the furnace belly region 4, so that the cooling element has better technical effects on cooling the slag skin strength and efficiency and forming stable furnace belly angles, and compared with the furnace belly brick lining which is easy to fall off and is arranged as described above, the cooling element can also play a role in supporting the slag skin, thereby realizing the effect of stabilizing the thickness of the slag skin.

The application has the beneficial effects that: according to the application, compared with a mode of arranging a furnace belly brick lining which is easy to fall off or a mode of embedding a cooling pipeline in the cooling wall, the cooling piece 1 in the furnace belly region 4 is more difficult to wear or fall off compared with the mode of arranging the furnace belly brick lining, so that the angle of the furnace belly angle is more stable, and in addition, the slag layer in the blast furnace is inserted into the cooling piece to form a certain supporting effect on the slag layer, so that the slag thickness of the molten belt is moderate and the furnace burden is more stable compared with the mode of embedding the cooling pipeline in the cooling wall without any supporting in the cooling wall, the stable smelting in the blast furnace is realized, meanwhile, the slag layer is prevented from falling off, the slag layer is stably formed, the reinforced cooling effect is formed on the furnace belly of the blast furnace, and the service life of the cooling wall and the service life of the wind gap on the blast furnace opening cooling wall 3 are improved.

In some embodiments of the present application, the inside of the cooling element 1 is a hollow tubular structure, a water inlet end and a water outlet end are arranged outside the cooling element 1 on the cooling wall 2 of the furnace belly, the water inlet end is communicated with a water supply tank, a high-pressure water pump is arranged on a pipeline between the water supply tank and the water inlet end, the water speed of water introduced into the cooling element 1 by the high-pressure water pump is more than 2m/s, and the water temperature in the cooling element 1 is lower than 35 ℃.

It is to be understood that the hollow tubular structure is arranged inside the cooling element 1, and high-pressure water is introduced into the cooling element 1 to rapidly cool the inner wall of the furnace belly region 4, so that the cooling strength and the cooling efficiency inside the furnace belly region 4 are further enhanced in the process of continuously forming slag skin, and the stability of the slag skin state is ensured. The water velocity of water in the high-pressure water pump leading-in cooling piece 1 is more than 2m/s and can cool down the interior of the furnace belly region 4 more quickly, cooling efficiency and cooling strength of the cooling piece 1 are improved greatly, stability of slag skin formation in a molten zone is guaranteed better, the water temperature of cooling water in the cooling piece 1 is lower than 35 ℃, generation of bubbles in the cooling water in the cooling piece 1 can be restrained, and the slag skin generation process is more stable.

In some embodiments of the application, the length of the cooling element 1 extending into the belly region 4 is 40mm.

The extent of the cooling element 1 extending into the shaft region 4 is calculated from the shaft angle and the slag skin thickness (about 30mm to 60 mm) of the blast furnace design.

It will be appreciated that a penetration length of the cooling element 1 into the hearth region 4 of 40mm enables the hearth angle to reach the optimum angle as far as possible at a slag skin thickness of 30mm to 60mm, and that a penetration length of the cooling element 1 into the hearth region 4 of 40mm ensures the supporting effect of the cooling element 1 on the slag skin.

In some embodiments of the application, the wear resistant refractory layer is a braze alloy layer.

It is understood that the fully welded alloy layer has better fire and wear resistance than the pure copper material which is easy to conduct heat.

In some embodiments of the present application, the cooling element 1 is made of a material that is easy to conduct heat, and it should be noted that the material that is easy to conduct heat is oxygen-free pure copper, and oxygen-free pure copper has better heat conducting property than other materials.

It should be understood that the cooling element 1 is made of a material which is easy to conduct heat and can conduct heat better (meaning of the material is to conduct better cooling), so that cooling efficiency is further improved, the wear-resistant refractory layer is arranged on the outer surface layer of the cooling element 1 inserted into the furnace belly region 4, the damage speed of the surface of the cooling element 1 by slag skin can be greatly reduced, and therefore the service life of the cooling element 1 is prolonged, and meanwhile, the stability of the angle of the furnace belly is kept as much as possible.

In some embodiments of the application, the cooling element 1 comprises a plurality of cooling elements 1, which cooling elements 1 are evenly distributed between the whole blast furnace belly cooling wall 2 and the tuyere cooling wall 3 along the circumferential direction of the blast furnace.

It will be appreciated that by arranging the cooling element 1 in a circle along the circumference of the hearth region 4, the cooling intensity inside the hearth can be made more uniform, and the effect of more stable slag skin formation can be achieved.

In some embodiments of the application, the cooling element 1 is a cooling bar or a cooling plate.

It should be understood that the cooling element 1 may be shaped as a cooling bar, a cooling plate, or any other shaped shape that can rapidly cool the slag crust.

In some embodiments of the present application, the water inlet end of the cooling element 1 is further provided with a flow meter.

It should be understood that the water inlet end of the cooling element 1 is provided with a flowmeter, which can be used for monitoring the water speed of the high-pressure water flowing into the cooling element 1, and adjusting the high-pressure water pump according to the water speed in the flowmeter, so that the water speed of the high-pressure water in the cooling element 1 can reach a certain threshold value, the cooling degree of the slag skin can be optimized, and the forming stability degree of the slag skin can be optimized.

In some embodiments of the present application, the plurality of cooling elements 1 are communicated with the same water supply tank.

It should be understood that the plurality of cooling elements 1 are communicated with the same water supply tank, so that the water temperature in each cooling element 1 can be consistent, and the cooling degree achieved by each cooling element 1 can be kept consistent.

In some embodiments of the application, the cooling element 1 is fixed with bricks between the furnace belly cooling wall 2 and the tuyere cooling wall 3.

During the construction of the blast furnace or during the middle repair of the blast furnace, the cooling piece 1 is inserted between the furnace belly cooling wall 2 and the air port cooling wall 3, and during the construction of the blast furnace or during the repair of the blast furnace, the cooling piece 1 is inserted, so that the stability and the strength lifting effect of the cooling piece 1 on the cooling wall can be better ensured, and the service life of the cooling piece 1 can be prolonged.

It should be understood that, in the process of building the blast furnace, the furnace cavity angle is relatively stable due to the fact that the cooling element 1 is not easy to damage, after the optimal furnace cavity angle beneficial to the production of the blast furnace is calculated (the step is the prior art), the angle and the position of the end part of the cooling element 1 relative to the furnace cavity cooling wall 2 are determined according to the optimal furnace cavity angle, so that the built blast furnace cavity angle can be ensured to reach a relatively stable proper angle, and the stability of slag skin production can be facilitated.

It should be noted that all the directional indicators in the embodiments of the present application are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," 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 present application. In this specification, schematic representations of the above terms are not necessarily directed 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. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The device for stabilizing the blast furnace slag crust is characterized by comprising a cooling piece, wherein the cooling piece is arranged between a furnace belly cooling wall and a wind port cooling wall, the cooling piece stretches into a furnace belly area, a wear-resistant refractory layer is arranged outside the furnace belly area, and the cooling piece is used for supporting the root of the slag crust.

2. The device according to claim 1, wherein the cooling member is of a hollow tubular structure, a water inlet end and a water outlet end are arranged outside the cooling member on the cooling wall of the furnace belly, the water inlet end is communicated with a water supply tank, a high-pressure water pump is arranged on a pipeline between the water supply tank and the water inlet end, the water speed of water fed into the cooling member by the high-pressure water pump is more than 2m/s, and the water temperature in the cooling member is lower than 35 ℃.

3. The apparatus of claim 1, wherein the cooling element extends into the belly region by a length of 40mm.

4. The apparatus of claim 1, wherein the wear resistant refractory layer is a fully welded alloy layer.

5. The apparatus of claim 1, wherein the cooling member is formed from a thermally conductive material.

6. The apparatus according to claim 1, wherein the cooling elements comprise a plurality of cooling elements, and the cooling elements are uniformly distributed between the whole blast furnace belly cooling wall and the tuyere cooling wall along the circumferential direction of the blast furnace.

7. The apparatus of claim 1, wherein the cooling element is a cooling bar or a cooling plate.

8. The apparatus of claim 1, wherein a flow meter is further provided between the cooling element inlet end and the high pressure water pump.

9. The apparatus of claim 2, wherein the plurality of cooling elements are connected to a single water supply tank.

10. The apparatus of claim 1, wherein the cooling element is bricked with the belly cooling wall and the tuyere cooling wall.