Smoke prevention device at feed opening for transfer-in stage of bottom blowing furnace
By using hook-type sealing tools in the transfer stage of the bottom blower and suspended sealing tools in the transfer stage, alternately combined to seal the bottom blower outlet, the problem of flue gas overflow is solved and the environmentally friendly and economical flue gas treatment effect is achieved.
Patent Information
- Application Number
- CN202323267297.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-01
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2033-12-01
AI Technical Summary
During the transfer of the bottom blower, the flue gas at the discharge port is severely overflowing, resulting in increased pollution and environmental protection pressure. The traditional treatment method is costly and occupies a large area.
The hook-type sealing tool is used to seal the discharge port during the transfer stage of the bottom blower, and combined with the suspended sealing tool during the transfer stage, and alternately combine to achieve effective isolation of the flue gas.
It effectively prevents the flue gas from overflowing at the discharge port during the transfer and exit of the bottom blower, reduces the cost and area of environmentally friendly flue gas treatment, and improves the working environment.
Smart Images
Figure CN222688787U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metal smelting, in particular to a smoke prevention device at a material discharge port in a bottom blowing furnace transfer stage. Background Art
[0002] A bottom-blown furnace is a smelting equipment that blows oxygen into the molten pool in the furnace through an oxygen nozzle at the bottom of the furnace body. It is usually a closed horizontal cylindrical converter with a steel plate shell and a chrome-magnesium refractory brick lining. The furnace body is equipped with a rotating device that can rotate 90 degrees. The furnace body is equipped with a feeding port, a smoke exhaust port, a slag discharge port, a sulfur discharge port, etc. The end wall is equipped with a fuel burner for furnace opening and insulation. During production, the lower part of the furnace is the melt, the front end of which is the reaction zone, and the rear end is the precipitation zone. An oxygen spray gun is installed at the lower part of the reaction zone to blow oxygen into the molten pool, so that the molten pool is in a strong stirring state.
[0003] In the actual production process, it is necessary to control the pressure inside the furnace and increase secondary air at the discharge port to ensure that the generated smoke and dust do not overflow into the air; however, the secondary air must be closed during the transfer in and out of the bottom blowing furnace. Since the furnace body is long and the negative pressure in the discharge port area is low, smoke will emerge from the discharge port, and the smoke overflow will become more serious. The smoke overflow into the air will cause pollution and have a bad impact on the working environment; especially as the production capacity gradually increases, the smoke in the discharge port area becomes more and more difficult to control during the transfer in and out, which increases the pressure of dealing with environmentally friendly smoke.
[0004] For the flue gas treatment of the above-mentioned discharge port, the traditional treatment method is to install a flue gas collection device at the rotation stroke of the discharge port and isolate the discharge port area. This flue gas collection device and isolation treatment require a high production cost, which undoubtedly increases the economic pressure of environmentally friendly flue gas treatment, and also occupies a larger factory area. Utility Model Content
[0005] In view of the deficiencies existing in the above-mentioned prior art, the utility model proposes a smoke prevention device at the feed port of a bottom blowing furnace during the transition stage, so as to solve the problems existing in the above-mentioned background technology.
[0006] The smoke-proof transfer device of the utility model adopts a hook-type plugging tool, which is a tool used to block the discharge port of the bottom-blown furnace during the transfer stage (i.e., the process of the furnace body rotating from 0° to 90°) to prevent smoke. The bottom of the hook-type plugging tool is provided with a hook-shaped support leg. When in use, the barb at the lower end of the support leg is used to hook the bottom of the discharge port to ensure that the hook-type plugging tool is not blown out by the smoke during the transfer process. Combined with the smoke-proof tool used in the transfer-out stage, the bottom-blown furnace is effectively isolated from the discharge port smoke during the transfer-out and transfer-in processes. The transfer-in and transfer-out (rotation from 90° to 0°) processes of the bottom-blown furnace are performed alternately. When the transfer-out stage is completed, the plugging tool used in this stage is immediately taken out, and the hook-type plugging tool is used to continue to block the discharge port to ensure that the smoke does not overflow from the discharge port. The device of the utility model has a simple structure and is easy to use. While ensuring the savings in production costs and improving the working environment of the factory area, it can also effectively save the occupied area of the factory building.
[0007] The above technical objectives of the utility model are achieved through the following technical solutions:
[0008] The smoke prevention device is used at the discharge port of the bottom blowing furnace during the transition stage. The device is a hook-type blocking tool and is installed at the discharge port of the bottom blowing furnace during the transition stage.
[0009] A further preferred embodiment of the above scheme is as follows: the hook-type plugging tool comprises a cover plate, a plurality of legs and an operating rod, each leg is connected to the bottom of the cover plate, and the operating rod is connected to the top of the cover plate.
[0010] A further preferred embodiment of the above scheme is that the diameter of the cover plate is the same as the diameter of the feed opening.
[0011] A further preferred embodiment of the above scheme is as follows: each supporting leg comprises a vertical rod and a horizontal rod, the vertical rod and the horizontal rod are connected to form a right-angle hook, and the right-angle hook is located at one end away from the cover plate.
[0012] A further preferred embodiment of the above scheme is as follows: the opening of each right-angle hook faces the outer edge of the cover plate, and the free end of the cross bar exceeds the outer edge of the cover plate.
[0013] By adopting the above solution, the utility model has the following beneficial effects compared with the prior art:
[0014] 1. The hook-type plugging tool of the utility model is used for smoke blocking in the bottom-blowing furnace at the transfer stage, and is used in combination with the suspension-type plugging tool in the transfer-out stage; the suspension-type plugging tool is used to block the feed opening during the transfer-out process of the furnace body to prevent the smoke from overflowing at the feed opening during the transfer-out process, and the suspension-type plugging tool can be reused in multiple transfer-out processes; after the furnace body is transferred out and before the transfer-in process is ready, the suspension-type plugging tool is taken out, and the feed opening is blocked with the hook-type plugging tool to prevent the smoke from overflowing at the feed opening from the transfer-out process to the transfer-in process The barb at the bottom of the hook-type plugging tool can firmly hook the bottom of the discharge port, so that the hook-type plugging tool will not be pushed open by the flue gas during the furnace transfer process; after the second transfer, the material needs to be added immediately, so the hook-type plugging tool is designed to be pushed into the furnace. After the transfer, the hook-type plugging tool is directly put into the furnace. The combination of the suspended plugging tool and the hook-type plugging tool effectively solves the problem of flue gas overflow at the discharge port of the bottom blowing furnace in the transfer-out stage and the transfer-in stage. It can be quickly replaced and plays a good smoke prevention role.
[0015] 2. The device of the utility model can replace the traditional fume collection device at the discharge port and the process of isolating the discharge port area, saving capital costs and reducing the occupied area of the factory. The device has a simple structure and is easy to operate, which greatly reduces the fume treatment pressure at the discharge port and is conducive to improving the working environment of the factory. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings required in the embodiments are briefly introduced below. The drawings described below are only part of the embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the suspended plugging tool according to the first embodiment of the utility model;
[0018] Figure 2 It is a longitudinal cross-sectional view of the suspended plugging tool of the first embodiment of the utility model;
[0019] Figure 3 This is a three-dimensional structural schematic diagram of a suspended plugging tool according to the second embodiment of the utility model;
[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the suspended plugging tool of the second embodiment of the utility model from another angle;
[0021] Figure 5 It is a three-dimensional structural schematic diagram of the hook-type plugging tool of the utility model;
[0022] Figure 6 It is a longitudinal cross-sectional view of the hook-type plugging tool of the utility model;
[0023] In the figure: 1. round plate one; 2. round plate two; 3. connecting rod; 4. lifting ring; 5. cover plate; 6. supporting leg; 7. operating rod; 8. upper reinforcing assembly; 81. cross bar one; 82. upper oblique bar one; 83. upper oblique bar two; 9. lower reinforcing assembly; 91. cross bar two; 92. lower oblique bar one; 93. lower oblique bar two. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments. Example
[0025] Reference Figure 1-2 , Figure 5-6 The utility model provides a smoke-proof rotation device for the feeding port of a bottom-blown furnace. When the bottom-blown furnace is in production, its feeding port and smoke outlet are both in a vertical direction and open to the sky. After the bottom-blown furnace has been in continuous production for about 5 days, the converter needs to be overhauled once (i.e., the feeding port is rotated from 90° to nearly 0°), and then switched in again (i.e., the feeding port is rotated from nearly 0° to 90°) to continue production. During the process of switching out and switching in the bottom-blown furnace, a large amount of smoke will come out of the feeding port. Therefore, a smoke-proof device needs to be designed to block the feeding port during the switching out stage and the switching in stage, which includes a suspended blocking tool (such as Figure 1-2 ) and hook-type plugging tools (such as Figure 3-4 ), the hanging type sealing tool and the hook type sealing tool are alternately installed and sealed at the discharge port of the bottom blowing furnace (the discharge port is cylindrical). When the bottom blowing furnace is turned out, the hanging type sealing tool is used to seal the discharge port of the bottom blowing furnace; after the bottom blowing furnace is turned out, the hanging type sealing tool is taken out before being turned in, and the hook type sealing tool is used to seal the discharge port of the bottom blowing furnace.
[0026] Specifically, the suspended plugging tool is as follows Figure 1-2As shown, it includes a circular plate 1 and a circular plate 2, which are made of two steel plates of different sizes and 3 mm thick, wherein: the diameter of the circular plate 1 is ≥ the diameter of the feed opening, and the diameter of the circular plate 2 is < the diameter of the feed opening, and the specific sizes of the circular plate 1 and the circular plate 2 are determined by the specifications of the feed opening; a plurality of connecting rods 3 are arranged between the circular plate 1 and the circular plate 2, and in this embodiment, there are four connecting rods 3, each of which is made of steel bars, and the length of each connecting rod 3 is 300 mm, each The two ends of the connecting rod 3 are respectively welded to the circumferential edges of the circular plate 1 and the circular plate 2 on one side close to each other; a lifting ring 4 is fixedly connected to the top of the circular plate 1, and the lifting ring 4 is used to tie the soft steel wire. Before the bottom blowing furnace is turned out, the outer side of multiple connecting rods 3 is wrapped with insulation cotton in advance in a circumferential direction as a whole, and the outside of the insulation cotton is tied with a thin rope, and suspended at the lifting ring 4 with soft steel wire, and the suspension type plugging tool is blocked at the discharge port from above the discharge port. The structure is suspended by soft steel wire here and will not affect the converter operation of the furnace body.
[0027] Since the bottom blowing furnace needs to be fed immediately after it is turned in, and the operating platform above the discharge port has devices such as a discharge belt and a discharge port hopper, the suspended sealing tool is inconvenient to be quickly removed when the discharge port is turned upward. Therefore, on the basis of the suspended sealing tool, a hook-type sealing tool that can be put into the furnace is set, and the hook-type sealing tool is used alternately with the suspended sealing tool to seal and prevent smoke at the discharge port during the entire process of entering and exiting the bottom blowing furnace. When waiting for the turn-in, the suspended sealing tool is replaced with the hook-type sealing tool. When the bottom blowing furnace is completely turned in, the hook-type sealing tool is directly put into the furnace to facilitate the direct addition of materials into the discharge port.
[0028] Specifically, Figure 5-6 As shown, the hook-type plugging tool includes a cover plate 5, a plurality of legs 6 and an operating rod 7. The cover plate 5 is also made of a steel plate with a thickness of 3 mm, and the diameter of the cover plate 5 is equal to the diameter of the feed opening. The operating rod 7 is connected to the top of the cover plate 5, and each leg 6 is connected to the bottom of the cover plate 5. Each leg 6 includes a vertical rod and a horizontal rod. The horizontal rod is connected to the vertical rod away from one end of the cover plate, and the vertical rod and the horizontal rod form a right-angle hook. The opening of each right-angle hook faces the outer edge of the cover plate 5, as shown in FIG. Figure 6 As shown, the utility model is provided with four legs, and the distance between the outermost ends of two adjacent right-angle hooks is greater than the diameter of the cover plate 5. When the bottom blowing furnace is rotated out, the suspended plugging tool is taken out before being rotated in, and the outer sides of the multiple legs 6 are circumferentially wrapped with thermal insulation cotton, and the outside of the thermal insulation cotton is tied with a thin rope. By holding the operating lever 7, the hook-type plugging tool is placed at the discharge port, so that the right-angle hook at its lower end hooks the bottom of the discharge port to prevent the hook-type plugging tool from being pushed open by the flue gas during the rotation of the bottom blowing furnace. Example
[0029] On the basis of the above-mentioned embodiment 1, in order to form a unified integral structure between the plurality of connecting rods 3 and the circular plate 1 and the circular plate 2, the structure is further improved as follows:
[0030] like Figure 3-4 As shown, an upper reinforcement assembly 8 is arranged between two opposite connecting rods 3 and the circular plate 1, and a lower reinforcement assembly 9 is arranged between the other two opposite connecting rods 3 and the circular plate 2. In this embodiment, the upper reinforcement assembly 8 and the lower reinforcement assembly 9 are arranged vertically, and their materials are the same as those of the connecting rods 3, and they are all triangular structures, wherein: the upper reinforcement assembly 8 includes a cross bar 1 81, an upper oblique rod 1 82 and an upper oblique rod 2 83, and both ends of the cross bar 1 81 are fixedly connected to the corresponding connecting rod 3, one end of the upper oblique rod 1 82 and the upper oblique rod 2 83 are fixedly connected to the bottom of the circular plate 1, and the other ends of the upper oblique rod 1 82 and the upper oblique rod 2 83 are respectively connected to the corresponding The corresponding ends of the connecting rod 3 and the cross bar 1 81 are fixedly connected at the same time; the lower reinforcing assembly 9 includes a cross bar 2 91, a lower oblique rod 1 92 and a lower oblique rod 2 93, the cross bar 2 91 is vertically cross-connected with the cross bar 1 81, and the two ends of the cross bar 2 91 are fixedly connected to the corresponding connecting rod 3, one end of the lower oblique rod 1 92 and the lower oblique rod 2 93 are fixedly connected to the bottom of the circular plate 2 2, and the other ends of the lower oblique rod 1 92 and the lower oblique rod 2 93 are fixedly connected to the corresponding ends of the corresponding connecting rod 3 and the cross bar 2 91 at the same time, the upper reinforcing assembly 8 and the lower reinforcing assembly 9 make the circular plate 1 1 and the circular plate 2 2 located at the two ends of the connecting rod 3 form a unified whole, and the connection is more stable. Example
[0031] When the device of the utility model is in use, insulation cotton is wrapped around the outside of the suspension type sealing tool and the hook type sealing tool in advance and tied with a thin rope to increase the sealing of the discharge port. When the bottom blowing furnace is turned out, the suspension type sealing tool is placed at the discharge port by hanging the lifting ring 4 with a soft steel wire to block the flue gas at the discharge port. After the furnace is turned out, the suspension type sealing tool is taken out before turning in. The staff holds the operating lever 7 to put the hook type sealing tool into the discharge port to ensure that the right-angle hook at the lower end of the support leg 6 hooks the bottom of the discharge port, so that the hook type sealing tool will not be pushed open by the flue gas during the furnace turning in. After the bottom blowing furnace is turned out and turned in for a period of time, it is necessary to add materials through the discharge port. After turning in, the hook type sealing tool is pushed into the furnace as a whole, and then the materials are added from the discharge port.
[0032] It should be noted that the device of the utility model solves the long-standing problem of flue gas at the feed port of the bottom blowing furnace, especially during the shutdown and startup of the bottom blowing furnace, the flue gas overflow at the feed port is well blocked, improving the working environment. At the same time, it replaces the installation of a flue gas collection device and isolation treatment in the feed port area, reduces the area occupied by the factory building, saves the company funds, and greatly reduces the pressure of environmental flue gas treatment.
[0033] It should be clear that the above detailed description of the embodiments of the utility model provided in the accompanying drawings is only used to further illustrate the utility model, and is not intended to limit the scope of the utility model claimed for protection, but only represents selected embodiments of the utility model. Based on the embodiments of the utility model, some non-essential improvements and adjustments made by ordinary technicians in this field according to the above content of the utility model belong to the protection scope of the utility model.
Claims
1. A smoke prevention device for the feeding port of a bottom blowing furnace during the transition phase, characterized in that: The device is a hook-type plugging tool, which is installed at the feeding port of the bottom-blowing furnace during the transfer stage; The hook-type plugging tool comprises a cover plate (5), a plurality of legs (6) and an operating rod (7), each leg (6) is connected to the bottom of the cover plate (5), the operating rod (7) is connected to the top of the cover plate (5), and the diameter of the cover plate (5) is the same as the diameter of the feed opening.
2. The smoke prevention device at the feed port of the bottom blowing furnace during the transition phase according to claim 1 is characterized in that: Each supporting leg (6) comprises a vertical rod and a horizontal rod, wherein the vertical rod and the horizontal rod are connected to form a right-angle hook, and the right-angle hook is located at an end away from the cover plate (5).
3. The smoke prevention device at the feed port of the bottom blowing furnace during the transition phase according to claim 2 is characterized in that: The opening of each right-angle hook faces the outer edge of the cover plate (5).
4. The smoke prevention device at the feeding port of the bottom blowing furnace during the transition stage according to claim 3 is characterized in that: The free end of the crossbar extends beyond the outer edge of the cover plate.