T-shaped blast furnace tapping main channel

Abstract

The utility model belongs to metallurgical ironmaking equipment technical field relates to a T type blast furnace iron tapping main ditch, this T type blast furnace iron tapping main ditch is arranged on the iron tapping field platform, the T type blast furnace iron tapping main ditch is composed of main ditch body and main ditch T section, the main ditch body has the main ditch body front section and small well that are arranged in order along the iron flow flowing direction, and is equipped with the slag skimmer between the main ditch body front section and small well, the main ditch T section is connected in the end of the main ditch body front section, and is equipped with the slag ditch in the end of main ditch T section to discharge slag flow, is equipped with the iron ditch at small well to discharge iron flow. The utility model discloses through T type design, under the premise of not increasing the main ditch longitudinal length and iron tapping field area, utilize the main ditch T section and the main ditch body front section and present right angle or obtuse angle connection, indirectly lengthened the effective length of main ditch, thereby lengthened slag iron flow path, promoted the separation time and effect, ensured the efficient separation of molten iron and slag, optimized the blast furnace iron tapping process.

Description

Technical Field

[0001] This utility model belongs to the technical field of metallurgical ironmaking equipment and relates to a T-type blast furnace tapping main trough. It is mainly used in the blast furnace ironmaking tapping field system and is especially suitable for situations where the blast furnace needs to be expanded or the number of tapholes increased during major overhauls, but the longitudinal extension of the tapping main trough is difficult due to limited space and other factors. Background Technology

[0002] In blast furnace ironmaking, the tapping process is crucial, and the main tapping channel, as a key piece of equipment in this process, plays a vital role in achieving effective separation of molten iron and slag. Besides considering width and depth, the length of the main tapping channel plays a decisive role in the slag-iron separation effect. Traditionally, the length of the main tapping channel refers to the distance from the taphole reference point to the skimmer. In actual production, there is a certain difference in the flow velocities of molten iron and slag. The flow velocity of molten iron is typically about 3-8 t / min, while the flow velocity of molten slag is about 2-6 t / min. Based on this velocity range, the length of the main tapping channel is generally designed to be 7-19 m.

[0003] The length of the main channel affects the slag-iron separation effect mainly in two aspects. First, the length of the main channel is directly proportional to the slag-iron separation time. The longer the main channel, the longer the slag and iron remain in it, resulting in more thorough separation, ensuring the purity of both molten iron and slag, and improving the quality of ironmaking. Second, increasing the length of the main channel increases the volume of the molten pool, slowing down the flow velocity of the molten slag and iron during the flow process. This change not only effectively mitigates the jet impact of molten slag and iron but also reduces the erosion of the refractory material in the main channel by the slag-iron flow, thereby extending the service life of the refractory material in the main channel and reducing production costs.

[0004] However, during major renovations and upgrades to blast furnaces, there is often a need to expand capacity or increase the number of tapholes. At this time, the longitudinal extension of the main taphole becomes extremely difficult due to limitations imposed by factors such as the size of the tapping platform and the layout of the molten iron transport line. If the main taphole length cannot reach the ideal state, a series of problems will arise. On the one hand, the slag-iron separation time is shortened, resulting in a significant reduction in the separation effect, affecting the quality of molten iron and slag, and consequently impacting the stable operation of subsequent steelmaking processes. On the other hand, the increased slag-iron flow velocity intensifies the scouring force on the main taphole, leading to a substantial increase in the wear rate of refractory materials. This not only increases the frequency of refractory material replacement in the main taphole, raising production costs, but may also cause safety accidents due to damage to the refractory materials, posing a serious threat to the safety and economy of blast furnace production. Therefore, how to solve the problem of limited main taphole length has become a pressing technical challenge in the field of blast furnace ironmaking. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a T-type blast furnace tapping main channel to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A T-type blast furnace tapping main trough is arranged on the tapping platform, and the T-type blast furnace tapping main trough is composed of the main trough body and the T-section of the main trough.

[0008] The main ditch body has a front section of the main ditch body and a small well arranged sequentially along the direction of iron flow, and a skimmer is provided between the front section of the main ditch body and the small well;

[0009] The main ditch T section is connected to the end of the front section of the main ditch body, and a slag ditch is provided at the end of the main ditch T section to discharge slag flow. An iron ditch is provided at the small well to discharge iron flow.

[0010] Furthermore, the main channel T section is connected to the front section of the main channel body at a right angle or an obtuse angle.

[0011] Furthermore, the main channel body is designed to be straight, and the T-segment of the main channel is designed to be straight or zigzag.

[0012] Furthermore, the working layer surface elevation at the connection point of the main trench T section and the front section of the main trench body is consistent.

[0013] Furthermore, the working face of the main ditch T section has no slope or has a negative slope towards the front section of the main ditch body.

[0014] Furthermore, the main ditch T-section working face is characterized by a negative slope of 1%.

[0015] Furthermore, the main trench body is provided with a residual iron hole at the end of the small well, and the main trench body is connected to the residual iron trench through the residual iron hole to discharge residual iron.

[0016] Furthermore, the working face of the main trench body is provided with a downward slope along the direction of iron flow, so that the iron flow can smoothly flow into the small well.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. Effectively extends the length of the main channel, improving the slag-iron separation effect.

[0019] This invention, through an innovative T-shaped design, indirectly extends the effective length of the main trough without increasing its longitudinal length or the footprint of the tapping area. This is achieved by connecting the T-section of the main trough to the front section of the main trough body at a right or obtuse angle. In traditional designs, insufficient main trough length due to site constraints leads to short slag-iron separation time and poor results. This solution, by extending the slag-iron flow path, significantly improves separation time and efficiency, ensuring efficient separation of molten iron and slag and optimizing the blast furnace tapping process.

[0020] 2. Increase the volume of the molten pool, slow down the flow rate, and extend the service life of the refractory material.

[0021] The introduction of the T-section in the main channel significantly increases the volume of the molten pool, slowing down the flow rate of molten slag and iron. This design effectively reduces the jet impact and scouring of the slag and iron flow on the refractory material, mitigating wear, extending service life, and reducing maintenance costs. The working face of the T-section in the main channel adopts a no-slope or negative-slope design, further ensuring that the slag flow smoothly into the slag channel and the molten iron flows back to the main channel body, achieving optimized flow direction.

[0022] 3. Compact design, economical and practical, highly adaptable

[0023] This technical solution features a compact design and simple structure, making it particularly suitable for blast furnace retrofitting or new construction projects where longitudinal extension of the main trough is not feasible due to site constraints. It is easy to implement and has low investment costs. It can be used not only for optimizing existing main troughs but also for designing new blast furnace main troughs, demonstrating excellent economic efficiency and practicality, and providing flexible solutions for different scenarios.

[0024] 4. Optimize operational efficiency and improve system performance

[0025] The negative slope of the main channel T section and the slag channel at its end, combined with the iron channel and residual iron hole at the small well on the main channel body, achieve precise control of the slag and iron flow direction. The slag flows smoothly into the slag channel, the molten iron flows into the small well through the sand hole under the skimmer, and finally enters the iron channel, while the residual iron is efficiently discharged through the residual iron hole. This design improves the efficiency of molten iron collection, optimizes the operation process, and enhances the performance of the entire iron tapping system.

[0026] In summary, the innovative design of the T-type blast furnace tapping main channel has solved the problem of limited space and effectively extended the length of the main channel.

[0027] Increasing the molten pool volume improves slag-iron separation and extends refractory life, while also being economical and practical, providing an efficient and flexible solution for optimizing the blast furnace tapping system.

[0028] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1This is a plan view of the main tapping channel of a T-type blast furnace in one embodiment;

[0031] Figure 2 for Figure 1 AA section diagram.

[0032] Attached reference numerals: 1-Main ditch body, 1-1-Front section of main ditch body, 1-2-Skimmer, 1-3-Small well, 2-T section of main ditch, 3-Slag ditch, 4-Iron ditch, 5-Residual iron ditch. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0035] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] like Figure 1As shown, this embodiment provides a T-type blast furnace tapping main trough, which is arranged on the tapping platform and mainly consists of the main trough body 1 and the main trough T-section 2. The main trough body 1 is conventionally configured, and along the direction of iron flow, it includes the main trough body front section 1-1, a slag skimmer 1-2, and a small well 1-3. The main trough T-section 2 is connected to the end of the main trough body front section 1-1, and a slag trough 3 is provided at the end of the main trough T-section 2 to discharge slag. An iron trough 4 is provided at the small well 1-3 to discharge iron. In addition, a residual iron hole is provided at the end of the small well 1-3 and connected to the residual iron trough 5 to discharge residual iron in the trough during trough repair.

[0037] The structure of the main channel is as follows:

[0038] The main channel body 1 is designed as a straight line, with its working surface having a downward slope along the direction of iron flow. The slope can be adjusted according to the actual blast furnace iron output and tapping speed, for example, it can be set to 1% to 3% to ensure that the iron flow can smoothly flow into the small well 1-3. The front section 1-1 of the main channel body is the first section after the molten slag and iron enter the main channel. The specific dimensions are designed according to the blast furnace iron output to ensure sufficient volume to accommodate the molten slag and iron. The skimmer 1-2 is set between the front section 1-1 of the main channel body and the small well 1-3 to separate the iron flow and slag flow. The skimmer 1-2 has a sand hole at the bottom. The iron flow flows into the small well 1-3 through the sand hole, while the slag flow continues to flow forward and enters the main channel T section 2. The small well 1-3 is the iron flow collection area. It has an iron dam at the end and is connected to the iron channel 4 through the iron dam to intercept part of the iron flow and form an iron storage main channel.

[0039] The structure of the main trench T section is as follows:

[0040] like Figure 1 and Figure 2 As shown, the main channel T section 2 is connected to the front section 1-1 of the main channel body at a 90° angle, meaning that the main channel T section 2 is perpendicular to the extension direction of the front section 1-1, thus forming a T-shaped structure. The main channel T section 2 is designed as a straight line, and its length can be determined according to actual needs to increase the total effective length of the main channel. The working surface elevation of the main channel T section 2 and the front section 1-1 of the main channel body is consistent at the connection point, ensuring that the slag flow can smoothly flow from the front section 1-1 of the main channel body into the main channel T section 2. The working surface of the main channel T section 2 has a negative slope of 1% towards the front section 1-1 of the main channel body, meaning that the end of the main channel T section 2 is slightly higher than the connection point by about 1%. This ensures that the molten iron flows back to the front section 1-1 of the main channel body in the main channel T section 2, preventing the molten iron from entering the slag channel 3 with the slag flow. At the same time, it allows the slag flow to smoothly flow into the main channel T section 2 and enter the slag channel 3 through the slag dam at the end, while preventing the molten iron flow from entering the slag channel 3.

[0041] Other components:

[0042] At the end of small wells 1-3, in addition to the iron dam, there is also a residual iron hole at the bottom. When it is necessary to repair the trench, the residual iron hole can be opened to discharge the residual iron in the trench through residual iron trench 5. The connection position between iron trench 4 and residual iron trench 5 can be flexibly arranged according to the actual situation of the iron tapping platform.

[0043] The working principle of the main tapping channel of this T-type blast furnace is as follows:

[0044] During the tapping process in the blast furnace, molten slag and iron flow from the taphole into the front section 1-1 of the main trough. Due to the downward slope of the working face of the main trough 1, the iron flow moves along the main trough 1 under gravity. When the slag-iron mixture flows through the skimmer 1-2, the iron flow, due to its higher density, flows through the sand hole under the skimmer 1-2 into the small well 1-3, then through the iron dam into the iron trough 4, and is finally transported to the molten iron ladle. The slag flow, due to its lower density, continues to flow along the front section 1-1 of the main trough and enters the T section 2 of the main trough. Because the T section 2 of the main trough has a negative slope, some of the molten iron mixed in with the slag flow can also flow smoothly back into the front section 1-1 of the main trough. The slag flow continues to flow forward in the T section 2 of the main trough, finally flowing into the slag trough 3 through the slag dam at the end, completing the slag-iron separation.

[0045] In this embodiment, the T-shaped blast furnace tapping main trough indirectly extends the effective length of the main trough by connecting the end of the front section 1-1 of the main trough body to the T-section 2 of the main trough, increasing the time and space for slag-iron separation, thereby improving the slag-iron separation effect. Simultaneously, the design of the T-section 2 of the main trough increases the volume of the molten pool, slows down the flow velocity of liquid slag and iron, reduces the erosion of the refractory material by the slag and iron flow, and extends the service life of the refractory material. Furthermore, this design cleverly utilizes space without increasing the area of ​​the tapping platform, making it particularly suitable for situations where longitudinal extension of the main trough is not possible due to site constraints.

[0046] In summary, this embodiment provides a compact, rationally designed, and easy-to-implement T-type blast furnace tapping main channel, which can effectively solve the shortcomings of traditional main channels under site constraints and has good economic efficiency and practicality.

[0047] In another embodiment, the main trench T section 2 can be designed as a curve as needed to further extend the effective length of the main trench; secondly, the main trench T section is connected to the front section of the main trench body at an obtuse angle to adapt to different iron tapping platform environments.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A T-type blast furnace tapping main trough, wherein the T-type blast furnace tapping main trough is arranged on the tapping platform, characterized in that, The T-type blast furnace tapping main channel consists of the main channel body (1) and the main channel T section (2); The main channel body (1) has a main channel body front section (1-1) and a small well (1-3) arranged sequentially along the direction of iron flow, and a skimmer (1-2) is provided between the main channel body front section (1-1) and the small well (1-3); The main channel T section (2) is connected to the end of the front section (1-1) of the main channel body, and a slag ditch (3) is provided at the end of the main channel T section (2) to discharge slag flow. An iron ditch (4) is provided at the small well (1-3) to discharge iron flow.

2. The T-type blast furnace tapping main trough according to claim 1, characterized in that, The main channel T section (2) is connected to the front section (1-1) of the main channel body at a right angle or an obtuse angle.

3. The T-type blast furnace tapping main trough according to claim 1, characterized in that, The main channel body (1) is designed to be straight, and the main channel T section (2) is designed to be straight or zigzag.

4. The T-type blast furnace tapping main trough according to any one of claims 1 to 3, characterized in that, The working layer surface elevation at the connection point of the main channel T section (2) and the front section (1-1) of the main channel body is consistent.

5. The T-type blast furnace tapping main trough according to claim 4, characterized in that, The working face of the main ditch section T (2) has no slope or has a negative slope toward the front section (1-1) of the main ditch body.

6. The T-type blast furnace tapping main trough according to claim 5, characterized in that... The working face of the main ditch T section (2) has a negative slope of 1%.

7. The T-type blast furnace tapping main trough according to claim 1, characterized in that, The main channel body (1) is provided with a residual iron hole at the end of the small well (1-3). The main channel body (1) is connected to the residual iron channel (5) through the residual iron hole to discharge residual iron.

8. The T-type blast furnace tapping main trough according to claim 1, characterized in that, The working face of the main channel body (1) is provided with a downward slope along the direction of iron flow so that the iron flow can flow smoothly into the small well (1-3).

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