High-efficiency, energy-saving, and safe 150-ton converter

Abstract

This invention relates to the field of metallurgical technology and discloses a high-efficiency, energy-saving, and safe 150-ton converter, comprising a converter body, a support ring, a lower suspension device, a tilting device, a slag-blocking skirt, a sliding plate slag-blocking device, trunnion bearings and supports, a bottom blowing system, a thin oil lubrication system, furnace body piping, and an infrared slag detection instrument. The converter has a furnace volume ratio greater than 1, and the bottom blowing system is equipped with 10 bottom blowing elements. The converter body is connected to the support ring via a lower suspension device, which is a connection device between the converter body and the support ring formed by three sets of vertical linkage mechanisms, two sets of horizontal linkage mechanisms, and a baffle device. This high-efficiency, energy-saving, and safe 150-ton converter reduces the number and amount of slag splashing, reduces the amount of slag entering the molten steel, saves cooling water consumption, increases the tilting speed, and increases the bottom blowing intensity, thereby improving the efficiency and quality of steel smelting.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, specifically to a high-efficiency, energy-saving, and safe 150-ton converter. Background Technology

[0002] Traditional 150-ton converters often suffer from numerous technical problems during operation, including frequent and large-volume splashing, and frequent and large-volume slag overflow at the furnace mouth. Furthermore, they suffer from long single-cycle smelting, high carbon-oxygen concentration at the blowing endpoint, high ferroalloy consumption, excessive slag discharge, and poor steel quality, resulting in low smelting efficiency and high energy consumption. During the tapping process, the low tilting speed can cause instability in smelting and tapping, and slag overflow can easily damage the trunnions. Additionally, the furnace cap often uses a structure with multiple turns of water-cooled steel pipes for cooling, which in practice leads to uneven deformation of the pipes and water leakage. Leaks in the water-cooled support rings and water accumulation under the furnace can cause explosions and safety hazards due to slag splashing into the accumulated water. Summary of the Invention

[0003] The present invention provides a high-efficiency, energy-saving and safe 150-ton converter to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above objectives, this invention provides a high-efficiency, energy-saving, and safe 150-ton converter, comprising a converter body, a support ring, a lower suspension device, a tilting device, a slag-blocking skirt, a sliding plate slag-blocking device, trunnion bearings and supports, a bottom blowing system, a thin oil lubrication system, furnace body piping, and an infrared slag detection instrument. The converter has a furnace volume ratio greater than 1. The converter body is connected to the support ring via a lower suspension device, which is a connection between the converter body and the support ring formed by three sets of vertical linkage mechanisms, two sets of horizontal linkage mechanisms, and a baffle device. The tilting device uses four AC variable frequency motors that start and stop synchronously, causing the converter body to rotate around the trunnion on the support ring. The bottom blowing element in the bottom blowing system is installed at the bottom of the converter body to blow inert gas into the converter body. There are 10 sliding slag-blocking devices arranged in a ring at the bottom of the converter. The sliding slag-blocking device is bolted to the taphole and automatically blocks slag during steel discharge by misaligning the flow holes between the sliding and fixed sliding plates. An infrared slag detector is installed on a fixed structure behind the converter to detect the presence of slag in the molten steel. The sliding slag-blocking device and the infrared slag detector are interlocked by an automated control system. This system has a pre-set program to control the opening and closing of the sliding slag-blocking device. Specifically, when the converter body tilts at a first preset angle, the sliding slag-blocking device is closed; when the converter body tilts at a second preset angle, the sliding slag-blocking device is opened; and after the infrared slag detector detects slag in the discharged molten steel, the sliding slag-blocking device is closed.

[0005] Preferably, the tilting device drives the converter body to rotate at a speed of 1.5 rpm / min; the air supply intensity of the 10 bottom blowing elements is 0.02-0.2 m³ / min. 3 / ton / min; The control system controls the sliding plate slag blocking device to close when the converter body is tilted to 30°-40°, and controls the sliding plate slag blocking device to open when the furnace body is tilted to 75°-80° to start tapping steel. In the later stage of tapping, when the converter body is tilted to 90°-110° and tapping ends, the infrared slag detector detects steel slag and controls the sliding plate slag blocking device to close. After the converter body is tilted back to the vertical position, the sliding plate slag blocking device is controlled to open.

[0006] Preferably, the converter has a non-water-cooled furnace opening located at the top of the converter body, using four separate cast iron furnace openings; the furnace cap is a radial cooling furnace cap located at the top of the converter body, comprising a furnace cap body, steel pipes, and connecting pipes. The furnace cap body has two rings of steel pipes, one above the other, and several connecting pipes are arranged vertically between the steel pipes. The connecting pipes are formed by welding angle steel to the furnace cap body, and the two ends of the angle steel are connected to the inside of the steel pipes; the support ring is a non-water-cooled support ring, manufactured in four sections, including one trunnion block on the drive side and one trunnion block on the non-drive side, one arc segment on the tapping side, and one arc segment on the charging side. The support ring body is a welded box-shaped structure, and vertical stiffeners are welded inside the box-shaped structure.

[0007] Preferably, it further includes: three slag-separating plates, respectively disposed above the trunnion on the transmission side, above the trunnion on the non-transmission side, and above the slag-blocking device on the sliding plate, which are fixedly connected to the slag-blocking skirt to prevent slag liquid from overflowing onto the trunnion and the slag-blocking device on the sliding plate.

[0008] Based on the above description and practical experience, the high-efficiency, energy-saving, and safe 150-ton converter described in this invention has the following advantages:

[0009] 1. The combined technology of a new converter furnace volume ratio greater than 1, 10 circumferential ventilated bottom blowing structural elements and a sliding plate slag blocking device can effectively reduce factors affecting the quality of molten steel such as slag splashing, overflowing, and dripping, thereby improving the quality of molten steel smelting and producing high-quality steel products.

[0010] 2. By adopting a combination of technologies that integrate tilting rotation for speed increase, bottom blowing for enhanced strength, and automatic slag blocking for steel tapping, the entire smelting cycle can be effectively shortened.

[0011] 3. A comprehensive technology combining a radiant cooling furnace cap, a non-water-cooled furnace opening, and a non-water-cooled support ring is adopted to save circulating cooling water.

[0012] 4. A comprehensive technology that saves ferroalloy materials by combining a new bottom-blowing structure with a sliding plate slag-blocking device.

[0013] 5. The combination of full positive torque design and combined suspension mechanism can effectively prevent production instability problems such as converter "nodding", uneven molten steel and shaking during tapping, and improve production stability.

[0014] 6. The comprehensive technology combining a radiant cooling furnace cap, a non-water-cooled furnace opening, a slag distribution plate on the skirt, and a non-water-cooled support ring can effectively prevent production failures and safety accidents such as uneven deformation of the furnace cap, water ingress and cracking of the furnace lining, and explosions caused by water accumulation and slag ingress under the furnace. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a high-efficiency, energy-saving, and safe 150-ton converter according to one embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the installation of the bottom blowing element in a high-efficiency, energy-saving, and safe 150-ton converter according to one embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the assembly of the high-efficiency, energy-saving, and safe 150-ton converter lower suspension device according to one embodiment of the present invention.

[0018] Figure 4 for Figure 3 A schematic diagram of the structure of section AA in the middle.

[0019] Figure 5 This is a schematic diagram of the assembly of two sliding plates in a sliding plate slag-blocking device according to one embodiment of the present invention.

[0020] Figure 6 This is a front view of the furnace cap of a high-efficiency, energy-saving, and safe 150-ton converter according to one embodiment of the present invention.

[0021] Figure 7 This is a top view of the furnace cap of a high-efficiency, energy-saving, and safe 150-ton converter according to one embodiment of the present invention.

[0022] Figure 8 This is a front view of the support ring of a high-efficiency, energy-saving, and safe 150-ton converter according to one embodiment of the present invention.

[0023] Figure 9 for Figure 8 A schematic diagram of the structure of the BB cross section.

[0024] Figure 10 This is a front view of the high-efficiency, energy-saving, and safe slag-separating plate in a 150-ton converter according to one embodiment of the present invention.

[0025] Figure 11 for Figure 10A schematic diagram of the CC section.

[0026] Figure 12 This is a schematic diagram of the tilting torque of a high-efficiency, energy-saving, and safe 150-ton converter at different tilting angles, according to one embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] 11. Tilting device; 12. Transmission side trunnion; 13. Non-transmission side trunnion; 14. Support ring; 15. Lower suspension device; 16. Converter body; 17. Bottom blowing element; 18. Slide plate slag blocking device; 21. Gas supply connector; 22. Lower protective brick; 23. Refractory mortar; 24. Metal hose; 31. Vertical linkage mechanism; 32. Horizontal linkage mechanism; 33. Ear plate; 34. Baffle device; 35. Guide frame; 41. Fixed slide plate; 42. Sliding slide plate; 43. Steel flow hole; 51. Furnace cap body; 52. Steel pipe; 53. Connecting pipe; 61. Tapering side arc section; 62. Charging side arc section; 63. Vertical stiffener; 71. Slag blocking skirt; 72. Slag separating plate. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0030] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention.

[0031] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] This disclosure provides a high-efficiency, energy-saving, and safe 150-ton converter. Please refer to [reference needed]. Figures 1 to 11 The high-efficiency, energy-saving and safe 150-ton converter mainly includes a converter body 16, a support ring 14, a lower suspension device 15, a tilting device 11, a slag-blocking skirt 71, a sliding plate slag-blocking device 18, trunnion bearings and supports, a bottom blowing system, a thin oil lubrication system, furnace body piping, an infrared slag detection instrument, a control system, and a furnace cap. The converter has a furnace volume ratio greater than 1. The converter body 16 is connected to the support ring 14 by a lower suspension device 15. The lower suspension device 15 is a connection device between the converter body 16 and the support ring 14 formed by three sets of vertical linkage mechanisms 31, two sets of horizontal linkage mechanisms 32, and a baffle device 34. The tilting device 11 uses four AC variable frequency motors, which start and stop synchronously and run synchronously, so that the converter body 16 rotates around the trunnion on the support ring 14. The bottom blowing element 17 in the bottom blowing system is installed at the bottom of the furnace body to blow inert gas into the converter body 16. There are 10 bottom blowing elements 17 in total, which are distributed in a ring on the bottom of the converter 16. The sliding plate slag blocking device 18 is located at the steel outlet of the converter body 16 and includes two fixed sliding plates 41 and a sliding plate 4 that are close together. 2. A driving structure for driving the sliding slide plate 42 to slide, wherein the fixed slide plate 41 and the sliding slide plate 42 are provided with steel flow holes 43, and the steel flow holes 43 on the fixed slide plate 41 are opposite to the steel outlet; an infrared slag detector is set below the steel outlet of the converter body 16 to detect whether there is slag in the discharged molten steel; an automatic control system is electrically connected to the slide plate slag blocking device 18 and the infrared slag detector, and has a preset program for controlling the opening and closing of the slide plate slag blocking device 18, wherein when the converter body 16 tilts at a first preset angle, the slide plate slag blocking device 18 is controlled to close; when the converter body 16 tilts at a second preset angle, the slide plate slag blocking device 18 is controlled to open; and after the infrared slag detector detects slag in the discharged molten steel, the slide plate slag blocking device 18 is controlled to close. Various types of automatic control systems exist in the prior art, which will not be described in detail here.

[0033] This high-efficiency, energy-saving, and safe 150-ton converter adopts a combination of technologies including a new converter furnace volume ratio greater than 1, 10 circumferential ventilated bottom-blowing structural elements, and a sliding plate slag-blocking device. This can effectively reduce factors affecting the quality of molten steel, such as slag splashing, overflowing, and dripping, thereby improving the quality of molten steel smelting and producing high-quality steel products.

[0034] The tilting device 11 drives the converter body 16 to rotate at a speed of 1.5 rpm / min; the air supply intensity of the 10 bottom blowing elements 17 is 0.02-0.2 m³ / min. 3 / ton / min; The automated control system controls the sliding plate slag-blocking device 18 to close when the converter body 16 tilts to 30°-40°, and to open when the body tilts to 75°-80° to begin tapping. Later in the tapping process, when the converter body 16 tilts to 90°-110° and the infrared slag detector detects slag, the sliding plate slag-blocking device 18 is closed. After the converter body 16 tilts back to a vertical position, the device is reopened. This high-efficiency, energy-saving, and safe 150-ton converter employs a combination of technologies including tilting rotation speed increase, improved bottom blowing intensity, and automatic slag-blocking tapping, effectively shortening the entire smelting cycle.

[0035] The converter has a non-water-cooled furnace mouth located at the top of the converter body, consisting of four separate cast iron furnace mouths. The furnace cap is a radially cooled cap located at the top of the furnace body, comprising a cap body 51, steel pipes 52, and connecting pipes 53. The cap body 51 has two rings of steel pipes 52, with several connecting pipes 53 vertically arranged between the steel pipes 52. Each connecting pipe 53 is formed by welding angle steel to the cap body 51, with both ends of the angle steel connected to the interior of the steel pipes 52. The support ring 14 is a non-water-cooled support ring, manufactured in four sections: one trunnion block on the drive side and one trunnion block on the non-drive side, one arc segment 61 on the tapping side, and one arc segment 62 on the charging side. The support ring body is a welded box-shaped structure, with vertical stiffeners welded inside. This high-efficiency, energy-saving, and safe 150-ton converter utilizes a comprehensive technology combining a radially cooled furnace cap, a non-water-cooled furnace mouth, and a non-water-cooled support ring 14. It can save a significant amount of circulating cooling water used in steelmaking production.

[0036] This high-efficiency, energy-saving, and safe 150-ton converter adopts a comprehensive technology that combines a new bottom-blowing structure with a sliding plate slag-blocking device, which can effectively save ferroalloy materials.

[0037] This high-efficiency, energy-saving, and safe 150-ton converter adopts a combination technology that combines a full positive torque design with a combined suspension mechanism. This can effectively prevent problems such as converter "nodding" during the smelting process, uneven molten steel tapping, and shaking, thus improving production stability.

[0038] This high-efficiency, energy-saving, and safe 150-ton converter also includes three slag-separating plates, located above the drive-side trunnion 12, the non-drive-side trunnion 13, and the sliding plate slag-blocking device 18, respectively. These plates are fixedly connected to the slag-blocking skirt to prevent slag overflow onto the trunnion and the sliding plate slag-blocking device. This high-efficiency, energy-saving, and safe 150-ton converter employs a comprehensive technology combining a radiant cooling furnace cap, a non-water-cooled furnace mouth, slag-separating plates on the skirt, and a non-water-cooled support ring 14. This effectively prevents production failures and safety accidents such as uneven furnace cap deformation, water ingress and cracking of the furnace lining, and explosions caused by water accumulation and slag ingress under the furnace.

[0039] In one specific embodiment, the high-efficiency, energy-saving, and safe 150-ton converter includes the following specific technical solutions:

[0040] 1. A combined technology for high-quality steelmaking, which integrates a new converter furnace volume ratio, 10 circumferential bottom blowing elements 17 and a sliding plate slag blocking device 18.

[0041] By increasing the outer diameter of the furnace shell, increasing the height of the furnace shell, and increasing the diameter of the furnace opening, a new 150-ton converter furnace volume ratio was designed. The furnace volume ratio was increased from 0.928 to 1.01. The furnace volume ratio is greater than 1, which reduces the number and amount of slag splashing, the number and amount of slag overflowing from the furnace opening, and the amount of slag entering the molten steel, thereby improving the quality of molten steel smelting.

[0042] Figure 1 The main structure of this high-efficiency, energy-saving, and safe 150-ton converter features a tilting device 11 consisting of four AC variable frequency motors that start, stop, and operate synchronously. This allows the converter body 16 to rotate, enabling steel to be tapped or slag to be discharged through the steel flow holes 43. The support ring 14 supports the converter body 16 and transmits the tilting torque, ensuring normal smelting operations in the converter.

[0043] In this embodiment, the traditional eight bottom-blowing elements 17 of a converter are designed as ten annular slot bottom-blowing elements, with the gas supply intensity ranging from 0.01 to 0.05 m³ / s. 3 / ton / min increased to 0.02-0.2m 3 / ton / min. Enhance bottom blowing stirring intensity, reduce the final carbon-oxygen concentration product, and improve the quality of molten steel.

[0044] Figure 2 This is a schematic diagram of the installation of the circumferential bottom-blowing element 17. First, after assembling the bottom-blowing element 17 and the gas supply connector 21, insert them into the lower protective brick 22 and the hole in the protective brick at the bottom of the furnace. Fill the opening at the bottom of the furnace with refractory mud 23, and fill and seal the circumferential gap between the gas supply element and the protective brick with high-purity magnesia. Then install the metal hose 24. After the gas is supplied, bottom blowing can be carried out.

[0045] This embodiment employs a sliding slag-blocking device that blocks both early-stage and late-stage slag, reducing the amount of slag entering the molten steel, improving steel quality, increasing production efficiency, and reducing the workload of smelting. Please refer to... Figure 1 and Figure 5 The sliding plate debris-blocking device 18 includes two fixed sliding plates 41 and a sliding sliding plate 42 that are attached together, as well as a drive structure for driving the sliding sliding plate 42 to slide. Figure 5 Only two sliding plates are shown. The driving structure that drives the sliding plate 42 is implemented in various ways in the prior art, and will not be elaborated here. Steel flow holes 43 are provided on the fixed sliding plate 41 and the sliding plate 42, with the steel flow holes 43 on the fixed sliding plate 41 facing the steel outlet. When the sliding plate 42 moves to align the two steel flow holes 43, steel can be discharged outwards; when the sliding plate 42 moves to misalign the two steel flow holes 43, the discharge outwards is stopped. This type of sliding plate slag-blocking device 18 can block both the initial slag at the beginning of pouring molten steel and the later slag at the end of pouring.

[0046] In practical applications, when the converter body 16 tilts from a vertical position to a position of 30°-40°, the automatic control system sends a command signal to close the sliding plate slag-blocking device 18. The sliding plate 42 moves, causing the two steel flow holes 43 to misalign, thus closing the device. The converter body 16 continues to tilt, allowing the slag above the molten steel to pass through the taphole and continue moving upwards. When the converter body 16 tilts to 75°-80°, the taphole is located in the middle of the molten steel. The automatic control system sends a command signal to open the sliding plate slag-blocking device 18. The sliding plate 42 moves, aligning the two steel flow holes 43, thus opening the device and allowing the molten steel to be discharged. As the molten steel continues to be discharged, the slag above gradually falls. When it reaches the taphole, some slag will be discharged and detected by the slag detector. The automatic control system then controls the sliding plate slag-blocking device 18 to close, preventing further slag discharge. Subsequently, after the converter body 16 tilts back to the vertical position, the automatic control system sends a command signal to open the sliding plate slag-blocking device 18, which then opens. This sliding plate slag-blocking device 18 can block both early and late slag, shortening the slag flow into the molten steel, improving steel quality and production efficiency, and reducing the workload of smelting.

[0047] Specifically, the slag-blocking process of the sliding plate slag-blocking device 18 is as follows: The tilting device 11 is activated, and the converter begins to tilt. When the converter tilts to a 35° position, the automatic control system sends a command signal to close the sliding plate slag-blocking device 18, and the sliding plate 42 automatically closes. When the converter tilts to a 75°-80° position, the automatic control system sends a command signal to open the sliding plate slag-blocking device 18, and the device opens to begin steel tapping. When the infrared slag detector detects slag at the end of steel tapping, the automatic control system sends a command signal to close the sliding plate slag-blocking device 18, and it automatically closes. After the converter tilts to a vertical position, the automatic control system sends a command signal to open the sliding plate slag-blocking device 18, and it opens. The pump of the hydraulic station used to drive the sliding plate 42 is then shut down.

[0048] 2. A combined technology that shortens the smelting cycle by integrating tilting and rotating speed-up, increasing bottom blowing intensity, and automatic slag-blocking for steel tapping.

[0049] By increasing the power of four variable frequency motors, the tilting speed was increased from 0.76 r / min to 1.5 rpm / min, shortening the auxiliary smelting time. Ten [units / types] were used. Figure 2 The circumferential slit bottom-blowing element 17 shown increases the air supply intensity to 0.02-0.2m. 3 / ton / min, shortening the smelting cycle. By replacing the converter slag detection device with an infrared slag detector; and adding a hydraulic sliding plate slag stop, i.e., sliding plate slag stop device 18, automatic slag stop and steel tapping are achieved, shortening the slag tapping time.

[0050] During automatic slag-blocking tapping, after the converter tilting begins, when the converter tilts to a certain position (i.e., 30°-40°), the automatic control system sends a command signal to close the sliding slag-blocking device 18, and the sliding slide 42 automatically closes. When the converter tilts to a position of 75°-80°, the automatic control system sends a command signal to open the sliding slag-blocking device 18, and the sliding slag-blocking device 18 opens, allowing tapping to begin. Later in the tapping process, when the converter tilts to 90°-110°, and the infrared slag detector detects slag at the end of tapping, the automatic control system sends a command signal to close the sliding slag-blocking device 18, and the sliding slag-blocking device 18 automatically closes. After the converter tilts to a vertical position, the automatic control system sends a command signal to open the sliding slag-blocking device 18, and the sliding slag-blocking device 18 opens.

[0051] 3. A comprehensive technology that combines a radiant cooling furnace cap with a non-water-cooled support ring 14, saving circulating cooling water.

[0052] Replacing the water-cooled furnace cap with a radiant cooling furnace cap improves cooling efficiency, saves circulating cooling water, and eliminates furnace cap leakage. Figure 6 and Figure 7This is a radial cooling furnace cap structure. The radial cooling furnace cap includes a furnace cap body 51, steel pipes 52, and connecting pipes 53. Specifically, the furnace cap body 51 is similar to a conventional furnace cap, with two concentric rings of steel pipes 52 on the body. Inlet and outlet water ports are connected to the steel pipes 52, and several connecting pipes 53 are vertically arranged between the steel pipes 52. In this embodiment, the connecting pipes 53 are formed by welding angle steel to the furnace cap body 51, with both ends of the angle steel communicating with the interior of the steel pipes 52. When the angle steel is welded to the furnace cap body 51, the sides of its two flanges are welded to the furnace cap body 51. The steel pipes 52, connecting pipes 53, and the outer wall of the furnace cap body 51 form a closed loop structure that allows water to flow through, enabling the input of cooling water for cooling.

[0053] The furnace cap water-cooling pipes adopt a radial design, utilizing steel pipes 52, steel plates (located at both ends of the steel pipes 52), angle steel (welded to the furnace cap body 51 to form a connecting pipe), elbows, joints, etc., to form a closed loop structure that allows water to flow. This effectively prevents water leakage caused by deformation and cracking of the water-cooling pipes due to heat deformation of the furnace shell, reducing safety hazards.

[0054] Compared to the traditional method of setting several adjacent rings of water-cooling pipes on the furnace cap body 51, this radial cooling furnace cap improves the cooling effect while reducing the unevenness of furnace cap deformation. This effectively prevents the water-cooling pipes from deforming and cracking due to furnace body heat deformation, thus preventing damage to the furnace lining. It also reduces the probability of water leakage due to water-cooling pipe deformation and cracking, reducing safety hazards, improving cooling efficiency, and saving circulating cooling water.

[0055] The use of non-water-cooled support ring 14 saves circulating cooling water and eliminates water leakage, water leakage corrosion and water accumulation under the furnace. Figure 8 and Figure 9 The support ring 14 is a non-water-cooled structure. It is manufactured in four sections: one trunnion on the drive side (12 pieces), one trunnion on the non-drive side (13 pieces), one arc-shaped section 61 on the steel tapping side, and one arc-shaped section 62 on the feeding side. These four sections form a circular support ring structure. The support ring body is a welded box-shaped structure with welded vertical stiffeners inside to improve its rigidity and prevent deformation during use. Figure 8 and Figure 9 The non-water-cooled support ring 14 shown solves problems such as water leakage from the support ring 14, water accumulation under the furnace, and explosions caused by steel slag splashing into the water under the furnace.

[0056] 4. Comprehensive saving technology for ferroalloy materials by combining a new bottom blowing structure with a sliding plate slag-blocking device.

[0057] Use 10 Figure 2 The circumferential slit bottom-blowing element 17 shown can increase the air supply intensity to 0.02-0.2m.3 / t / min, reducing alloy consumption. Adopting Figure 5 The slide plate slag-blocking device shown reduces the amount of slag discharged and lowers the consumption of ferroalloys. The combination of these two technologies forms a comprehensive ferroalloy material saving technology.

[0058] 5. A combined technology that integrates full positive torque design with a modular suspension mechanism, resulting in high stability in smelting and steel production.

[0059] The new converter furnace design with the above structural form can achieve Figure 12 The fully positive torque smelting method shown prevents negative torque from occurring during the smelting and tapping process, eliminates tilting "nodding," and reduces unevenness and sloshing of molten steel. Figure 12 In the figure, the horizontal axis represents the tilting angle of the converter body 16, and the horizontal axis represents the tilting torque.

[0060] use Figure 3 and Figure 4 The lower suspension device 15 shown is a combined suspension mechanism, which includes three sets of vertical linkage mechanisms 31, two sets of horizontal linkage mechanisms 32, and a stop device 34. The three sets of vertical linkages are evenly distributed between the support ring 14 and the converter body 16, with a central angle of 120° between each pair. Vertical ear plates 33 are installed on both the support ring 14 and the converter body 16. The two ends of the vertical linkage mechanisms 31 are hinged to the ear plates 33 on the support ring 14 and the converter body. The two sets of horizontal linkage mechanisms 32 are symmetrically distributed between the support ring 14 and the converter body 16. Horizontal ear plates 33 are installed on both the support ring 14 and the converter body, and the two ends of the horizontal linkage mechanisms 32 are hinged to the ear plates 33 on the support ring 14 and the converter body. In addition, a stop device 34 is provided on the tapping side between the support ring 14 and the converter body 16, and a guide frame 35 is provided on the steel feeding side between the support ring 14 and the converter body 16, which can further improve stability. This type of lower suspension device 15 can eliminate movement clearance, reduce the impact on the connecting rod, protect the connecting rod joint bearings, and enhance connection stability and the smoothness of the molten steel tapping process.

[0061] 6. A comprehensive technology that combines a radiant cooling furnace cap, a slag-blocking skirt 71, an upper slag distribution cover 72, and a non-water-cooled support ring 14 to reduce production failures and ensure production safety.

[0062] use Figure 6 and Figure 7 The radial cooling furnace cap shown improves the cooling effect while reducing the unevenness of furnace cap deformation, effectively preventing water cooling pipes from deforming and cracking due to furnace shell deformation caused by heat, thus damaging the furnace lining.

[0063] use Figure 10 and Figure 11The slag-separating cover 72 structure on the slag-blocking skirt 71 shown is installed between the slag-blocking skirt 71 on the side near the drive-side trunnion 12, the side near the non-drive-side trunnion 13, and the sliding plate slag-blocking device 18. This slag-separating cover 72 prevents slag overflow from passing over the trunnion, reducing damage to the trunnion. Specifically, the slag-separating cover 72 is welded from multiple steel plates and is welded onto the slag-blocking skirt 71. Its lower part is open to allow molten steel to flow out, while the side prevents slag from overflowing onto the trunnion, reducing damage to the trunnion.

[0064] In a specific converter safety renovation project, the aforementioned high-efficiency, energy-saving, and safe 150-ton converter was applied.

[0065] The original 150-ton converter had the following problems:

[0066] (1) The converter furnace volume ratio is too small, which makes it easy for slag overflow and splashing to occur, resulting in high consumption of steel materials.

[0067] (2) The bottom blowing of the converter uses 8 bottom blowing elements, resulting in low stirring intensity, high carbon-oxygen product at the end point, and high consumption of steel materials and alloys.

[0068] (3) The maximum tilting speed of the converter is only 0.76 r / min. The long tilting time and slow tilting speed make it easy for slag to fall during tapping, which is not conducive to improving the quality of molten steel and reducing alloy consumption.

[0069] (4) The non-full positive torque design causes instability phenomena such as "nodding" and abnormal current of the drive motor during the tilting and molten steel tapping process.

[0070] (5) Non-radiation cooling furnace cap consumes a lot of cooling water, and uneven deformation and water leakage can easily cause the furnace lining to crack.

[0071] (6) The lack of a slag-blocking structure at the tapping spout results in high consumption of ferroalloys and excessive slag discharge, which is detrimental to the production of high-quality steel. The design of the non-drive side sliding structure of the converter is unreasonable, making the hinged joint shaft prone to damage.

[0072] (7) The converter skirt plate has no slag separation structure, and the overflow of steel slag is prone to damaging the trunnion. There is no production process with automatic slag blocking and steel tapping.

[0073] (8) The gap between the converter body and the support ring is not controlled, resulting in poor stability of smelting production.

[0074] (10) The water-cooled support ring has a large amount of circulating cooling water, which is prone to cracking and leakage, severe corrosion, and water accumulation under the furnace. It often explodes due to steel slag splashing in.

[0075] To address the above issues, the high-efficiency, energy-saving, and safe 150-ton converter described in this application was used for a complete overhaul, resolving the aforementioned production and technical problems. The adoption of the high-efficiency, energy-saving, and safe 150-ton converter offers the following advantages:

[0076] (1) The new converter with a furnace volume ratio of 1.01, 10 circumferential bottom blowing elements 17 and a sliding plate slag blocking device are adopted to reduce factors that affect the quality of molten steel, such as slag splashing, overflowing, and slag falling, and improve the quality of molten steel smelting.

[0077] (2) Increase the tilting speed by 1 time, increase the bottom blowing intensity by 2 to 4 times, and adopt automatic slag blocking for steel tapping to shorten the entire smelting cycle.

[0078] (3) The use of a radiant cooling furnace cap, a non-water-cooled furnace opening, and a non-water-cooled support ring 14 greatly saves circulating cooling water, saving 70 tons / hour of water.

[0079] (4) The adoption of a new bottom blowing structure and a sliding plate slag blocking device saves 4 kg of ferroalloy material per ton of steel.

[0080] (5) The design of full positive torque and the combination of suspension mechanism (3 sets of vertical suspension links and 2 sets of horizontal suspension links) are adopted to achieve high production stability in the smelting and steel tapping process.

[0081] (6) The use of a radiant cooling furnace cap reduces uneven deformation of the furnace cap, the use of a non-water-cooled furnace opening eliminates water ingress and cracking of the furnace lining, the use of a slag-blocking skirt 71 with a slag-separating cover 72 prevents overflowing slag from damaging the trunnion, and the use of a non-water-cooled support ring 14 prevents water accumulation under the furnace from causing slag ingress and explosion, thus preventing or eliminating several production failures and production safety incidents.

[0082] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-efficiency energy-saving safe 150-ton converter, characterized in that, The converter includes a converter body, support ring, lower suspension device, tilting device, slag-blocking skirt, sliding plate slag-blocking device, trunnion bearings and supports, bottom blowing system, thin oil lubrication system, furnace body piping, and infrared slag discharge detector. The converter's volume ratio is greater than 1. The converter body is connected to the support ring by a lower suspension device, which is a connection device between the converter body and the support ring formed by three sets of vertical linkage mechanisms, two sets of horizontal linkage mechanisms and a stop device. The tilting device uses four AC variable frequency motors that start and stop synchronously and run synchronously, so that the converter body rotates around the trunnion on the support ring. The bottom blowing system has 10 bottom blowing elements installed at the bottom of the converter furnace body to blow inert gas into the converter furnace body. They are arranged in a ring at the bottom of the converter furnace body. The slag-blocking device is bolted to the steel outlet and automatically blocks slag and discharges steel by misaligning the steel flow holes between the sliding plate and the fixed plate. The infrared slag detector is installed on a fixed building behind the converter to detect whether there is slag in the molten steel. The sliding plate slag blocking device and the infrared slag detector are interlocked through an automated control system. The automated control system has a preset program for controlling the opening and closing of the sliding plate slag blocking device. Specifically, when the converter body tilts to a first preset angle, the sliding plate slag blocking device is controlled to close; when the converter body tilts to a second preset angle, the sliding plate slag blocking device is controlled to open; and after the infrared slag detector detects that the discharged molten steel contains slag, the sliding plate slag blocking device is controlled to close. The support ring is a non-water-cooled support ring, which is manufactured in 4 sections, including one trunnion block on the transmission side and one trunnion block on the non-transmission side, one arc segment on the steel tapping side and one arc segment on the feeding side. The support ring body is a welded box-shaped structure, and vertical stiffeners are also welded inside the box-shaped structure. Three slag-separating plates are respectively located above the trunnion on the transmission side, above the trunnion on the non-transmission side, and above the slag-blocking device on the sliding plate. They are fixedly connected to the slag-blocking skirt to prevent slag liquid from overflowing onto the trunnion and the slag-blocking device on the sliding plate.

2. The high-efficiency, energy-saving, and safe 150-ton converter as described in claim 1, characterized in that, The tilting device drives the converter body to rotate at a speed of 1.5 rpm / min; 10 The gas supply intensity of the bottom blowing elements is 0.02-0.2 m 3 / ton / min; The control system controls the sliding plate slag-blocking device to close when the converter body is tilted to 30°-40°, and controls the sliding plate slag-blocking device to open when the furnace body is tilted to 75°-80° to start tapping. In the later stage of tapping, when the converter body is tilted to 90°-110° and tapping ends, the infrared slag detector detects slag and controls the sliding plate slag-blocking device to close. After the converter body is tilted back to the vertical position, the sliding plate slag-blocking device is controlled to open.

3. The high-efficiency, energy-saving, and safe 150-ton converter as described in claim 1, characterized in that, The converter has a non-water-cooled furnace opening, located at the top of the converter body, and consists of four separate cast iron furnace openings. The furnace cap is a radiant cooling furnace cap, located on the upper part of the converter body. It includes a furnace cap body, steel pipes, and connecting pipes. The furnace cap body has two rings of steel pipes, one above the other. Several connecting pipes are arranged vertically between the steel pipes. The connecting pipes are formed by welding angle steel to the furnace cap body, and the two ends of the angle steel are connected to the inside of the steel pipe.

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