A device for drying mill scale in a steel mill
Patent Information
- Application Number
- CN202522634369.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-12
AI Technical Summary
但这些方法在处理此类物料时存在一定的技术问题，例如：首先，物料堆积紧密、内部水分难扩散，导致热效率低下，烘干能耗极高；其次，极易出现受热不均，造成表层过干结壳而内部水分残留的“外焦里湿”现象，无法将含水率稳定降至转炉要求的安全标准（通常<1%）以下
[0012]作为优选，左右两所述横管上分别设置有位于圈梁外侧的疏水阀和截止阀。通过在左右两横管上分别设置有位于圈梁外侧的疏水阀和截止阀，利用截止阀能够方便工作人员在对热蒸汽管道检修时切断蒸汽来源，利用疏水阀能够方便工作人员将凝结水自动、持续地排出，同时把热蒸汽锁在热蒸汽管道内。
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Figure CN224920787U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drying equipment technology, specifically to a device for drying iron oxide scale in a steel plant. Background Technology
[0002] Iron oxide scale generated during steelmaking is a valuable secondary iron resource with high iron content. Reusing it directly as a coolant or slag-forming agent in converter steelmaking allows for efficient, short-process recycling, which is significant for cost reduction, efficiency improvement, and resource conservation. However, its practical application faces a fundamental constraint: the produced iron oxide scale has a particle size of 5-50 mm and a moisture content as high as 15%-30%. Directly feeding it into the furnace can easily cause safety accidents such as splashing when the moisture comes into contact with the high-temperature molten steel, and seriously interferes with the stable control of the smelting process.
[0003] To overcome the moisture problem, existing technologies mainly rely on traditional drying methods, such as drum drying or fluidized bed drying. However, these methods have certain technical problems when processing such materials. For example, firstly, the material is densely packed, making it difficult for internal moisture to diffuse, resulting in low thermal efficiency and extremely high drying energy consumption; secondly, uneven heating is very likely to occur, causing the surface to be over-dried and crusted while the interior remains moist, resulting in a "burnt outside, wet inside" phenomenon, making it impossible to stably reduce the moisture content to below the safety standard required by the converter (usually <1%). In summary, existing drying technologies cannot achieve efficient and reliable deep dehydration of iron oxide scale, resulting in the long-term ineffective utilization of this resource in converters. Utility Model Content
[0004] This invention addresses the shortcomings of existing technologies by providing a device for drying iron oxide scale in steel plants. This device improves the purity and stability of iron oxide scale by removing moisture and impurities, thus providing high-quality raw materials for the steelmaking process and increasing the utilization rate of iron oxide scale.
[0005] This utility model is achieved through the following technical solution: a device for drying iron oxide scale in a steel plant is provided, including a ring beam placed on the ground of the scrap steel silo in the steel plant and closed in the circumferential direction, and a hot steam pipe installed in the ring beam. The steam inlet and outlet of the hot steam pipe extend laterally and pass through the ring beam. A steel plate is attached to the top of the ring beam and pressed against the hot steam pipe.
[0006] In use, this invention involves a circumferentially closed ring beam placed on the ground of a steel mill's scrap metal storage area, and a hot steam pipe installed within the ring beam. Both the inlet and outlet ends of the hot steam pipe extend laterally and pass through the ring beam. A steel plate is fitted abutting the top of the ring beam, pressing against the hot steam pipe. During operation, the inlet end of the hot steam pipe is first connected to a steam delivery mechanism, and the outlet end is connected to a drainage ditch outside the workshop. Then, by activating the steam delivery mechanism, hot steam is delivered into the hot steam pipe through the inlet end, allowing heat exchange between the hot steam and the pipe, turning the steam into condensate. This condensate then presses against the steel plate pressing against the hot steam pipe. The steel plate is heated, and then iron oxide scale is placed on the steel plate. The heated steel plate dries the iron oxide scale, dehydrating it and keeping it dry at a temperature above 60°C. After drying, the steam supply mechanism is shut off, preventing the supply of hot steam into the steam pipe. This stops the hot steam from heating the steel plate pressed against the steam pipe, allowing the iron oxide scale to cool naturally. During this process, the condensate is discharged through the steam outlet of the steam pipe to the drainage ditch outside the workshop. This process removes moisture and impurities from the iron oxide scale, improving its purity and stability, providing high-quality raw materials for the steelmaking process, and thus increasing the utilization rate of the iron oxide scale.
[0007] Preferably, the hot steam pipeline includes several horizontal pipes distributed laterally in the left-right direction. One end of each of the left and right horizontal pipes extends to the outside through a ring beam. A connecting pipe communicating with the ends of the two adjacent horizontal pipes is provided inside the ring beam. In use, the device connects the end of the right horizontal pipe extending to the outside to the steam supply mechanism, and the end of the left horizontal pipe extending to the outside to the drainage ditch outside the workshop. This allows the steam supply mechanism to continuously exchange heat with the horizontal pipes and connecting pipes as it delivers hot steam into the hot steam pipeline through the steam inlet. The hot steam then turns into condensate and is discharged into the drainage ditch outside the workshop, thereby heating the steel plate pressed against the hot steam pipeline.
[0008] Preferably, a top block is provided between two adjacent horizontal pipes, with the top and bottom of the top block abutting against the steel plate and the ground of the steel plant's scrap metal silo, respectively. By providing a top block between two adjacent horizontal pipes, with the top and bottom of the top block abutting against the steel plate and the ground of the steel plant's scrap metal silo, the stability of the steel plate during use can be improved, preventing the steel plate from bulging downwards during use.
[0009] Preferably, a circumferentially closed baffle is fitted onto the top of the steel plate. By fitting the circumferentially closed baffle onto the top of the steel plate, it is convenient for workers to place iron oxide scale on top of the steel plate for heating and drying.
[0010] Preferably, the outer walls of the enclosure panel and the ring beam are flush with the outer wall of the steel plate. This aligns the outer walls of the enclosure panel and the ring beam with the outer wall of the steel plate, making it easier for workers to place the iron oxide scale on top of the steel plate.
[0011] Preferably, the ring beam is filled with water slag. By filling the ring beam with water slag, the stability of the steel plate during use can be improved, preventing the steel plate from bulging downwards during use. It can also improve the heating effect of hot steam on the steel plate pressed against the hot steam pipeline.
[0012] Preferably, the left and right horizontal pipes are respectively equipped with a steam trap and a shut-off valve located outside the ring beam. By installing a steam trap and a shut-off valve on the left and right horizontal pipes respectively, the shut-off valve allows workers to easily cut off the steam source when inspecting the hot steam pipeline, and the steam trap allows workers to automatically and continuously discharge condensate while locking the hot steam inside the hot steam pipeline.
[0013] The beneficial effects of this utility model are as follows: By setting up a ring beam placed on the ground of the scrap steel silo in a steelmaking plant and closed circumferentially, and a hot steam pipe set inside the ring beam, the steam inlet and outlet of the hot steam pipe extend laterally and pass through the ring beam. A steel plate is attached to the top of the ring beam and presses against the hot steam pipe. When using the device, the steam inlet of the hot steam pipe needs to be connected to the steam delivery mechanism first, and the steam outlet of the hot steam pipe needs to be connected to the drainage ditch outside the workshop. Then, by starting the steam delivery mechanism, the steam delivery mechanism delivers hot steam into the hot steam pipe through the steam inlet, thereby allowing the hot steam to exchange heat with the hot steam pipe, turning the hot steam into condensate, thus pressing against the hot steam pipe. The steel plate is heated, and then iron oxide scale is placed on the steel plate. The heated steel plate dries the iron oxide scale, dehydrating it and keeping it dry at a temperature above 60°C. After drying, the steam supply mechanism is shut off, preventing the supply of hot steam into the steam pipe. This stops the hot steam from heating the steel plate pressed against the steam pipe, allowing the iron oxide scale to cool naturally. During this process, the condensate is discharged through the steam outlet of the steam pipe to the drainage ditch outside the workshop. This process removes moisture and impurities from the iron oxide scale, improving its purity and stability, providing high-quality raw materials for the steelmaking process, and thus increasing the utilization rate of the iron oxide scale. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a perspective view of the structure of this utility model; Figure 3 for Figure 2 Schematic diagram of part A in the middle; As shown in the figure: 1. Drain valve, 2. Horizontal pipe, 3. Enclosure, 4. Steel plate, 5. Gate valve, 6. Ring beam, 7. Connecting pipe, 8. Top block, 9. Slag. Detailed Implementation
[0015] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.
[0016] like Figures 1-3 The device for drying iron oxide scale in a steel plant, as shown in this utility model, includes a ring beam 6 placed on the ground of the scrap steel silo in the steel plant and closed in the circumferential direction, and a hot steam pipe installed in the ring beam 6. The steam inlet and outlet of the hot steam pipe extend laterally and pass through the ring beam 6. A steel plate 4 is attached to the top of the ring beam 6 and pressed against the hot steam pipe.
[0017] The hot steam pipeline includes several horizontal pipes 2 distributed laterally in a left-right direction. One end of each of the left and right horizontal pipes 2 extends to the outside through a ring beam 6. A connecting pipe 7 is installed inside the ring beam 6, communicating with the ends of the adjacent two horizontal pipes 2. In use, the end of the right horizontal pipe 2 extending to the outside is connected to the steam supply mechanism, and the end of the left horizontal pipe 2 extending to the outside is connected to the drainage ditch outside the workshop. This allows the steam supply mechanism to continuously exchange heat between the horizontal pipes 2 and the connecting pipe 7 as it delivers hot steam into the hot steam pipeline through the steam inlet. The hot steam then turns into condensate and is discharged into the drainage ditch outside the workshop, thereby heating the steel plate 4 pressed against the hot steam pipeline. A top block 8 is installed between adjacent horizontal pipes 2. The top and bottom of the top block 8 abut against the steel plate 4 and the ground of the steel mill's scrap steel silo, respectively. The top block 8 improves the stability of the steel plate 4 during use, preventing it from bulging downwards. A circumferentially closed enclosure 3 is attached to the top of the steel plate 4, allowing workers to easily place iron oxide scale on top of the steel plate 4 for heating and drying. By aligning the outer walls of the enclosure 3 and the ring beam 6 with the outer walls of the steel plate 4, it further facilitates the placement of the iron oxide scale on top of the steel plate 4. Water slag 9 is filled inside the ring beam 6, which not only improves the stability of the steel plate 4 during use, preventing it from bulging downwards, but also enhances the heating effect of the hot steam on the steel plate 4 pressed against the hot steam pipeline. Drain valves 1 and shut-off valves 5 are respectively installed on the left and right horizontal pipes 2, located outside the ring beam 6. The shut-off valve 5 allows workers to easily cut off the steam source during hot steam pipeline maintenance, while the drain valve 1 allows for the automatic and continuous discharge of condensate, while simultaneously locking the hot steam within the hot steam pipeline. The ring beam 6, enclosure 3, and top block 8 are all composed of continuously cast square billets, facilitating the use of the device by workers.
[0018] Combined with appendix Figure 1-3The method of using this utility model is as follows: First, the end of the right horizontal pipe 2 extending to the outside is connected to the steam supply mechanism, and the end of the left horizontal pipe 2 extending to the outside is connected to the drainage ditch outside the workshop. Then, by starting the steam supply mechanism, hot steam is supplied to the right horizontal pipe 2 through the shut-off valve 5. The hot steam continuously exchanges heat with the connecting pipe 7 through the horizontal pipe 2, turning the hot steam into condensate, which is discharged to the drainage ditch outside the workshop through the drain valve 1 on the left horizontal pipe 2. This allows the hot steam to heat the steel plate 4 pressed on the hot steam pipe. Then, the iron oxide scale is placed inside the enclosure 3 on top of the steel plate 4, and the heated steel plate 4 is used to dry the iron oxide scale, dehydrating and keeping it dry at a temperature greater than 60°C. After drying, the steam supply mechanism is turned off, so that the steam supply mechanism no longer supplies hot steam to the right horizontal pipe 2 through the shut-off valve 5. This prevents the hot steam from heating the steel plate 4 pressed on the hot steam pipe, allowing the iron oxide scale to cool naturally.
[0019] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.
Claims
1. An apparatus for drying iron oxide scale in a steel plant, characterized in that: It includes a ring beam (6) placed on the ground of the scrap steel warehouse of the steel plant and closed in the circumference, and a hot steam pipe set in the ring beam. The steam inlet and outlet of the hot steam pipe extend laterally and pass through the ring beam. A steel plate (4) is attached to the top of the ring beam and pressed on the hot steam pipe.
2. The apparatus for drying iron oxide scale in a steel plant according to claim 1, characterized in that: The hot steam pipeline includes several horizontal pipes (2) distributed laterally in the left-right direction. One end of each of the two horizontal pipes extends to the outside through a ring beam. A connecting pipe (7) is provided in the ring beam to communicate with the ends of the two adjacent horizontal pipes.
3. The apparatus for drying iron oxide scale in a steel plant according to claim 2, characterized in that: A top block (8) is provided between two adjacent horizontal pipes, and the top and bottom of the top block are respectively in contact with the steel plate and the ground of the steel plant scrap steel warehouse.
4. The apparatus for drying iron oxide scale in a steel plant according to claim 1, characterized in that: The top of the steel plate is fitted with a circumferentially closed enclosure (3).
5. The apparatus for drying iron oxide scale in a steel plant according to claim 4, characterized in that: The outer walls of both the enclosure and the ring beam are flush with the outer walls of the steel plate.
6. The apparatus for drying iron oxide scale in a steel plant according to claim 4, characterized in that: The ring beam is filled with water slag (9).
7. The apparatus for drying iron oxide scale in a steel plant according to claim 2, characterized in that: The two horizontal pipes on the left and right are respectively equipped with a drain valve (1) and a shut-off valve (5) located on the outside of the ring beam.