Blast furnace tapping main channel structure

Abstract

The utility model relates to the technical field of blast furnace tapping main channels, in particular to a blast furnace tapping main channel structure which comprises a tapping main channel body (the tapping main channel body is an iron storage type main channel), and a tapping main channel molten iron flowing channel, a skimmer and a small well are arranged in the main channel body in the flowing direction of molten iron. Branch tapping channel heads communicated with the main tapping channel are arranged at the two ends of the main tapping channel body respectively, small wells are formed in the positions, close to the branch channel heads, of the main tapping channel body, a slag channel head communicated with the main tapping channel is arranged on the upper portion of the main tapping channel body, and the main tapping channel is arranged downwards in an inclined mode. The inclination angle of the tapping main channel is linearly reduced along the flowing direction, and the height of the bottom of the branch channel head is higher than that of the bottom of the molten iron outlet when the molten iron is jetted and falls into the molten iron inlet; molten iron with a certain volume is stored in the iron storage type main channel and falls into the main channel along with the molten iron jetted by the blast furnace, and the stored molten iron with a certain depth buffers the impact of the molten iron jetted by the tap hole on the bottom of the main channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to a blast furnace iron tapping main ditch technology, concretely relates to a blast furnace iron tapping main ditch structure. BACKGROUND

[0002] In the iron tapping field of the ironworks, the main iron ditch is an important facility for bearing the slag iron water flowing out of the blast furnace tapping hole, and its performance is directly related to the continuity and stability of the blast furnace production. The main iron ditch not only bears the flow of high-temperature slag iron, but also undertakes the key task of separating slag iron. The rapid ejection of the iron water from the tapping hole forms a turbulent flow in the main ditch, which impacts the main ditch lining, the slag skimmer, the passage eye and the small well, accelerates the erosion of the refractory material and affects the service life of the main ditch.

[0003] During the blast furnace iron tapping process, the mixture of the iron water and the molten slag is ejected at high speed from the tapping hole, directly impacts the bottom of the main ditch and produces a strong back-splashing effect. These back-splashed molten slag flows turbulently in the direction away from the tapping hole under the rapid impact of the slag iron. When the slag iron mixture flows to the slag skimmer, the slag skimmer separates the slag iron through its special structure. The iron water flows to the small well through a specific channel at the bottom of the slag skimmer, while the molten slag floats on the upper part of the iron water due to its smaller density and agitates and fluctuates at the upper part of the slag skimmer.

[0004] However, during the process of the iron water flowing to the small well through the passage at the bottom of the slag skimmer, the bottom of the slag skimmer is immersed in the high-temperature iron water for a long time and bears the corrosion of the iron water. At the same time, there are still some molten slag entrapped in the iron water, which continuously erodes the bottom of the slag skimmer, and the erosion intensity increases continuously with the increase of the iron tapping amount. Such a harsh working environment puts higher requirements on the structure of the iron tapping main ditch.

[0005] At present, the iron tapping main ditch passage is generally straight, and the flow rates before and after in the main ditch passage are basically consistent, or even the flow rate in the rear section is higher than that in the front section. The rapidly flowing slag iron water impacts the slag-facing surface of the slag skimmer, and the size of the passage of the slag skimmer is reduced, which increases the flow rate of the iron water flowing through the passage eye. The iron water flowing out of the passage eye impacts the iron-facing surface of the square small well and then impacts the back of the slag skimmer, which accelerates the erosion of the slag skimmer. CONTENT OF THE UTILITY MODEL

[0006] In order to solve the above problems, the utility model embodiment provides a blast furnace iron tapping main ditch structure design, which realizes the purpose of solving the problems proposed in the background technology. In actual use, the iron water ejected rapidly from the blast furnace tapping hole flows into the main ditch, the iron water level in the main ditch gradually rises until the iron water level is higher than the height of the bottom of the branch ditch, and then the iron water flows out through the branch ditch head. There is a certain volume of iron water remaining in the main ditch. With the iron water ejected from the blast furnace falling into the main ditch, the remaining iron water with a certain depth buffers the impact of the iron water ejected from the tapping hole on the bottom of the main ditch.

[0007] In order to achieve the above object, the utility model adopts the following technical scheme:

[0008] A blast furnace iron tapping main ditch, including iron tapping main ditch body, the iron tapping main ditch body is iron storage type main ditch, the main ditch body is connected with the iron tapping main ditch channel, skimmer, small well that sets up in the main ditch body along the flowing direction, the iron tapping main ditch body both ends are provided with with the iron tapping main ditch channel the iron tapping water import, branch ditch ditch head that passes, the iron tapping main ditch body upper position is equipped with with the iron tapping main ditch channel the slag ditch ditch head that passes, the iron tapping main ditch channel is inclined downward setting, the inclination angle of the iron tapping main ditch channel linearly becomes small along the flowing direction, the height of the branch ditch ditch head bottom is higher than the height that the molten iron sprays falls into the iron tapping water import bottom arrangement.

[0009] In order to further optimize the utility model, the following technical scheme can be preferred:

[0010] Preferably, the channel width of the iron tapping main ditch channel linearly becomes large along the flowing direction.

[0011] Preferably, the iron tapping main ditch body includes the main ditch ditch lining at both sides, the slag ditch ditch head is set on the side wall of the main ditch ditch lining at one side, and the slag ditch ditch head is in an inverted horn shape with a wide inlet and a narrow outlet, which is beneficial to the collection of slag flow and rapid discharge at the outlet end.

[0012] Preferably, a skimmer beam is arranged on the iron tapping main ditch body corresponding to the position between the iron tapping main ditch channel and the small well, the skimmer beam is integrally prefabricated with the iron tapping main ditch body and is arranged vertically above the iron tapping main ditch channel, which can improve the service life of the skimmer, the widened bottom channel can reduce the flow rate of molten iron through the channel and slow down the scouring of molten iron through the channel.

[0013] Preferably, the small well part is in a trapezoidal structure, the channel width of the small well decreases along the flowing direction, and the channel width of the small well decreases from top to bottom, so as to change the slag-iron turbulent flow in the small well part, reduce the scouring of slag-iron on the small well, and ensure the smooth flow of molten iron and slow down the abrasion of molten iron on the branch ditch lining material.

[0014] Preferably, the slag ditch ditch head is an open slot arranged on the top of the side wall of the iron tapping main ditch body.

[0015] The utility model has the advantages of:

[0016] (1) The main trough for tapping iron adopts the structure of an iron storage trough. The slope of the bottom of the main trough is 1.5%-1.8%. The molten iron level in the main trough gradually rises until it is higher than the bottom height of the branch trough. The molten iron flows out through the head of the branch trough. There is a certain volume of molten iron in the main trough. As the molten iron ejected from the blast furnace falls into the main trough, the molten iron with a certain depth buffers the impact of the molten iron ejected from the tapping hole on the bottom of the main trough; it reduces the impact of the molten iron ejected from the tapping hole on the bottom of the main trough, and slows down the abrasion of the refractory at the bottom of the main trough iron drop point.

[0017] (2) The width of the main channel of the tapping channel gradually increases from the tapping port to the main channel of the slag skimmer, the slag flow rate in the main channel gradually decreases, the flow of slag in the main channel tends to be smooth, and the abrasion of slag on the main channel lining and the slag surface of the slag skimmer is reduced; this is conducive to sufficient time for the separation of slag and iron.

[0018] (3) The slag ditch head adopts a design with a wide inlet and a narrow outlet, which is conducive to the collection of slag flow and rapid discharge at the outlet.

[0019] (4) The skimmer beam is prefabricated as a whole, which reduces the potential hazards of on-site baking. At the same time, the aisle channel is greatly widened, the flow rate of molten iron in the channel is slowed down, the abrasion of the aisle channel is reduced, and the service life of the skimmer is improved.

[0020] (5) The trapezoidal structure of the small well changes the turbulent direction of the molten iron in the small well, which not only slows down the impact of the molten iron on the wall of the small well, but also slows down the impact of the molten iron on the back of the skimmer; the small well with a trapezoidal structure makes the molten iron discharge more stable, slowing down the scouring of the ditch lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Fig. 1 This is a schematic diagram of the main ditch structure of the blast furnace;

[0022] Fig. 2 This is a cross-sectional diagram of the main trough structure of a blast furnace;

[0023] In the figure: ① main ditch lining; ② slag ditch head; ③ main ditch channel; ④ small well; ⑤ branch ditch head; ⑥ slag skimmer beam; ⑦ main ditch working layer; ⑧ main ditch slope. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] Example:

[0026] like Figs. 1-2As shown, a blast furnace tapping main channel includes a tapping main channel body, which is a storage-type main channel. A tapping channel, a skimmer, and a small well are connected and arranged in the main channel body along the flow direction. Tapping branch channel heads are arranged at both ends of the main channel body and are connected to the tapping channel. A small well is arranged on one side of the main channel body near the branch channel head. Molten iron enters the tapping water inlet, passes through the tapping channel, and is discharged from the branch channel head through the small well. A slag channel head is arranged at the upper position of the main channel body and is connected to the tapping channel. The tapping channel is arranged obliquely downward, and the inclination angle of the tapping channel decreases linearly along the flow direction. The height of the bottom of the branch channel head is higher than the height of the molten iron injection falling into the bottom of the tapping water inlet.

[0027] The above design has the following advantages:

[0028] (1) Optimizing the molten iron flow path: By designing the connected tapping channel and small well, the molten iron can smoothly enter the tapping water inlet, flow into the small well after passing through the tapping channel, and finally be discharged from the branch channel head. This design not only ensures the continuous flow of molten iron, but also effectively avoids the blockage and stagnation of molten iron during the flow process, improving the efficiency of blast furnace tapping.

[0029] (2) Improving the efficiency of molten iron discharge: The tapping channel is arranged obliquely downward, and its inclination angle decreases linearly along the flow direction. This design allows the molten iron to gradually slow down during the flow process, which is beneficial to the smooth discharge of molten iron. At the same time, the height of the bottom of the branch channel head is higher than the height of the molten iron injection falling into the bottom of the tapping water inlet, which can further ensure the smooth discharge of molten iron and avoid the problem of poor discharge caused by the accumulation of molten iron.

[0030] (3) Facilitating slag-iron separation: A slag channel head is arranged at the upper position of the main channel body and is connected to the tapping channel. This allows the slag produced during the blast furnace ironmaking process to be easily discharged through the slag channel head, achieving effective separation of slag and iron. This not only improves the quality of molten iron, but also helps to reduce the failure and downtime during the operation of the blast furnace.

[0031] (4) Enhancing structural stability and durability: The structure of the blast furnace tapping main channel is designed reasonably, and the connection between the parts is tight and stable, which can withstand the harsh environment of high temperature and high pressure during the blast furnace ironmaking process. At the same time, by optimizing the material selection and manufacturing process, the durability and service life of the tapping main channel can be further improved. In summary, the structural design of the blast furnace tapping main channel has the advantages of optimizing the molten iron flow path, improving the efficiency of molten iron discharge, facilitating slag-iron separation, and enhancing the structural stability and durability. It is of great significance to improve the production efficiency and product quality of blast furnace ironmaking.

[0032] As a preferred design scheme, the channel width of the main channel of the tapping main channel gradually increases along the flow direction, which can further facilitate the smooth flow of molten iron. As the molten iron flows, its flow rate and flow speed may change, and the gradual increase in channel width can ensure that the molten iron does not produce excessive impact force during the flow process due to excessive flow speed or flow rate, thereby protecting the structure of the tapping main channel.

[0033] As a preferred design scheme, the main channel body includes main channel liners on both sides, and the slag channel head is opened on the side wall of the main channel liner on one side. The slag channel head has a reverse horn structure with a wide inlet and a narrow outlet, which is beneficial for the collection of slag and rapid discharge at the outlet end. The slag gradually accumulates during the flow process, and the reverse horn structure can ensure that the slag does not block during the collection process, while being quickly discharged at the outlet end, avoiding the impact on the operation of the blast furnace.

[0034] As a preferred design scheme, a slag skimmer beam is provided on the main channel body corresponding to the position between the main channel of the tapping main channel and the small well. The slag skimmer beam is integrally prefabricated with the main channel body of the tapping main channel and is arranged transversely above the main channel of the tapping main channel, which can improve the service life of the slag skimmer, and the widened design of the bottom channel can reduce the speed of the molten iron flowing through the channel and slow down the erosion of the molten iron flowing through the channel.

[0035] As a preferred design scheme, the small well has a trapezoidal structure, and the channel width of the small well decreases along the flow direction. The channel width of the small well decreases from top to bottom in order to change the turbulence of slag and iron in the small well part, reduce the erosion of slag and iron to the small well part, and at the same time ensure that the molten iron flows out more smoothly and slow down the erosion of the molten iron to the branch channel liner material.

[0036] The tapping main channel presented in this embodiment, when actually used, the molten iron rapidly ejected from the blast furnace tapping hole flows into the main channel, the molten iron level in the main channel gradually rises until the molten iron level is higher than the height of the bottom of the branch channel, and then the molten iron flows out through the branch channel head. There is a certain volume of molten iron remaining in the main channel. As the molten iron ejected from the blast furnace falls into the main channel, the remaining molten iron with a certain depth cushions the impact of the molten iron ejected from the tapping hole on the bottom of the main channel. The slag and iron in the main channel flows from the falling point to the direction of the slag skimmer. The width of the main channel gradually increases, the flow speed of the molten iron in the main channel decreases, the separation of slag and iron in the main channel is more sufficient, and the degree of erosion of the main channel liner and the slag skimmer by slag and iron is reduced. The trapezoidal structure of the small well can greatly improve the resistance to slag and iron erosion and improve the flow rate of the molten iron.

[0037] It should be noted that in the description of the utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In addition, it should be further pointed out that in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] The term "includes" or any other similar term is intended to cover non-exclusive inclusion, so that the process, article or equipment / device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in the process, article or equipment / device.

[0040] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the utility model, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical scheme after the changes or replacements will fall within the protection scope of the utility model.

Claims

1. A blast furnace taphole main channel structure comprising a taphole main channel body, characterized in that: The main outlet channel of the main outlet channel is inclined downward, and the inclination angle of the main outlet channel linearly decreases along the flow direction.

2. The main trough structure of a blast furnace according to claim 1, characterized in that: The channel width of the main outlet channel linearly increases along the flow direction.

3. The main trough structure of a blast furnace according to claim 1, characterized in that: The main outlet channel body includes main channel lining on both sides, and the slag channel head is arranged on the side wall of the main channel lining on one side.

4. The main trough structure of a blast furnace according to claim 1, characterized in that: The main outlet channel body is provided with a slag skimmer beam corresponding to the position between the main outlet channel and the small well, and the slag skimmer beam is integrally prefabricated with the main outlet channel body and is arranged vertically above the main outlet channel.

5. The main trough structure of a blast furnace according to claim 1, characterized in that: The small well is a trapezoidal structure, and the channel width of the small well decreases along the flow direction.

6. The main trough structure of a blast furnace according to claim 1, characterized in that: The slag channel head is an open slot arranged on the top of the side wall of the main outlet channel body.

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