Blast furnace bottom structure for reducing erosion of side wall of blast furnace hearth

Abstract

The utility model relates to the technical field of blast furnace hearth bottoms, in particular to a blast furnace hearth structure capable of reducing erosion of the side wall of a blast furnace hearth. The furnace bottom is of a slope structure with a high center and a low edge; the center of the furnace bottom is provided with a boss, the surface of the furnace bottom is provided with a plurality of flow guide grooves which take the boss as the center and radiate towards the edge, and the flow guide grooves extend to an iron notch area; the number of the diversion trenches is consistent with that of the iron notches, and the diversion trenches are in one-to-one correspondence with the iron notches. And molten slag iron can flow to the position of an iron outlet in time, so that the erosion of the side wall of the hearth is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace hearths and bottoms, and particularly relates to a blast furnace bottom structure for reducing the erosion of the side wall of a blast furnace hearth. Background Art

[0002] In the modern iron and steel production process, the output of blast furnace ironmaking accounts for more than 90% of the total iron output. With the development trend of blast furnace enlargement, the system integration degree and complexity of blast furnaces are constantly increasing, and the number is constantly decreasing, resulting in large investment, long construction period for blast furnace overhauls and great impact on the entire iron and steel production process. Therefore, the problem of blast furnace long life has become the focus of attention of ironmaking workers, and realizing blast furnace long life is also the only way for iron and steel enterprises to achieve sustainable development.

[0003] The hearth and bottom of a blast furnace are key parts of a blast furnace, and their life is one of the limiting links for blast furnace long life. The problem of hearth and bottom long life of a blast furnace is a systematic project, mainly involving many factors such as the structure design of the hearth and bottom, the quality of refractories and equipment, the construction quality, production operation and maintenance management, etc. Among them, a reasonable hearth and bottom structure is the prerequisite and key to realizing the long life of the hearth and bottom.

[0004] The blast furnace hearth is the area where slag and iron are stored in a blast furnace, and the stored slag and iron are regularly discharged through the slag and iron tapholes. There is liquid slag and iron inside the hearth, and at the same time, there is a dead stock column suspended or sitting at the bottom in the hearth. The smelted slag and iron need to penetrate through the dead stock column and fall into the hearth. The slag and iron stored inside the hearth flow continuously inside the hearth, scouring and eroding the refractories of the hearth. If the communication of slag and iron inside the hearth is not good, the melted slag and iron cannot flow to the position of the taphole in time, resulting in uneven operation of the hearth. In the light case, it will cause short-term inability to discharge slag and iron, making the blast furnace stuffy, affecting the balance of the blast furnace. In the heavy case, if the communication is not good for a long time, it is easy to cause serious local erosion of the hearth and there is a risk of burning through. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a blast furnace bottom structure for reducing the erosion of the side wall of a blast furnace hearth, which is conducive to the melted slag and iron flowing to the position of the taphole in time, thereby reducing the erosion of the side wall of the hearth.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A blast furnace bottom structure for reducing the erosion of the side wall of a blast furnace hearth, the bottom is a slope structure with a high center and a low edge; a convex platform is provided at the center of the bottom, and a plurality of diversion channels radiating from the convex platform to the edge are provided on the surface of the bottom, and the diversion channels extend to the iron notch area; the number of the diversion channels is the same as the number of iron notches, and the diversion channels correspond to the iron notches one by one.

[0008] Further, the convex platform is a frustum of a cone.

[0009] Furthermore, the furnace bottom is built with ceramic materials.

[0010] Furthermore, the ceramic material is mullite brick.

[0011] Furthermore, the mullite brick is fan-shaped, and the furnace bottom is built with multiple circles of mullite bricks.

[0012] Furthermore, among the multiple circles of mullite bricks, the size and radian of the mullite bricks in each circle are the same.

[0013] Compared with the prior art, the utility model has at least the following technical effects or advantages:

[0014] 1. The furnace bottom of the utility model has a slope structure with a high center and a low edge. There is a convex platform in the center of the furnace bottom, and multiple grooves radiating from the convex platform to the edge are provided on the furnace bottom surface and extend to the taphole area. By physically intervening in the original factors affecting the erosion of the side wall of the blast furnace hearth, the slag-iron communication inside the hearth is improved, which is conducive to the timely flow of the molten slag-iron to the position of the taphole, making the hearth work more evenly, reducing the development degree of the molten iron circulation, thereby reducing the erosion of the side wall of the hearth and improving the service life of the blast furnace.

[0015] 2. The utility model is made of mullite bricks, which has the advantages of good chemical stability, high temperature resistance, high dimensional accuracy, uniform structure, beautiful appearance and low thermal conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the utility model.

[0017] Figure 2 is Figure 1 the A-A cross-sectional view of

[0018] Figure 3 is a schematic structural diagram of the mullite brick of the utility model.

[0019] Figure 4 is Figure 3 the B-B cross-sectional view of

[0020] In the figure:

[0021] 1 - frustum 2 - diversion groove 3 - slope 1# - first taphole 2# - second taphole 3# - third taphole 4# - fourth taphole DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Embodiments of the present utility model will be described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, 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 thus should not be construed as limiting the present utility model.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] In the description of the present utility model, it should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is merely for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus, they should not be construed as limiting the protection scope of the present utility model.

[0028]

Embodiment

[0029] As Figures 1-4 shown, a blast furnace bottom structure for reducing the erosion of the side wall of the blast furnace hearth has a slope structure with a higher center and a lower edge.

[0030] A small-diameter frustum is provided at the center of the furnace bottom. The diameter of the small-diameter frustum 1 is 0.5 - 1 m. The area around the frustum 1 is a slope 3. The center of the furnace bottom frustum is 20 - 40 cm higher than the edge.

[0031] In this embodiment, four tapholes are evenly distributed around the circumference of the furnace bottom edge, namely the first taphole 1#, the second taphole 2#, the third taphole 3#, and the fourth taphole 4#.

[0032] Four diversion channels 2 radiating from the center of the frustum 1 to the edge are provided on the surface of the furnace bottom. The diversion channels 2 extend to the taphole area; the four diversion channels 2 correspond to the four tapholes one by one. The depth of the diversion channels 2 is 5 - 8 cm, and the width is 8 - 12 cm.

[0033] The furnace bottom is made of mullite bricks. The present utility model is made of mullite bricks, which have the advantages of good chemical stability, high temperature resistance, high dimensional accuracy, uniform structure, beautiful appearance, and low thermal conductivity.

[0034] The mullite bricks are fan-shaped. The bottom is made of multiple circles of mullite bricks, and the size and radian of each circle of mullite bricks are the same. The slope of the upper surface of the mullite bricks is the same and meets the height difference from the center to the edge.

[0035] The utility model physically intervenes in the original factors affecting the erosion of the side wall of the blast furnace hearth, enabling better communication between slag and iron inside the hearth, facilitating the timely flow of molten slag and iron to the tapping hole position, making the hearth work more evenly, reducing the development degree of molten iron circulation, thereby reducing the erosion of the side wall of the hearth and improving the service life of the blast furnace.

[0036] The protection scope of the utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the utility model, making equivalent substitutions or changes according to the technical solution and the inventive concept of the utility model, shall be covered by the protection scope of the utility model.

Claims

1. A blast furnace bottom structure for reducing erosion of the side wall of a blast furnace hearth, characterized in that: The furnace bottom is a slope structure with a high center and low edges; A boss is provided at the center of the furnace bottom, and a plurality of guide grooves radiating toward the edge with the boss as the center are provided on the surface of the furnace bottom, and the guide grooves extend to the iron mouth area; The number of the guide grooves is consistent with the number of the iron holes, and the guide grooves correspond to the iron holes one by one.

2. A blast furnace bottom structure for reducing erosion of the side wall of a blast furnace hearth according to claim 1, characterized in that: The boss is a frustum.

3. A blast furnace bottom structure for reducing erosion of the side wall of a blast furnace hearth according to claim 1, characterized in that: The furnace bottom is built with ceramic materials.

4. A blast furnace bottom structure for reducing erosion of the side wall of a blast furnace hearth according to claim 3, characterized in that: The ceramic material is mullite brick.

5. A blast furnace bottom structure for reducing erosion of the side wall of a blast furnace hearth according to claim 4, characterized in that: The mullite bricks are fan-shaped, and the furnace bottom is built by multiple circles of mullite bricks.

6. A blast furnace bottom structure for reducing erosion of the side wall of a blast furnace hearth according to claim 5, characterized in that: In the multiple circles of mullite bricks, the size and curvature of each circle of mullite bricks are consistent.

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