AOD furnace high-temperature flue gas waste heat recycling device

Abstract

The invention relates to the related technical field of AOD (Argon Oxygen Decarburization) furnaces, in particular to an AOD furnace high-temperature flue gas waste heat recycling device which comprises an AOD furnace, and a preheating device is arranged on the inner surface of a flue. According to the AOD furnace high-temperature flue gas waste heat recycling device, through the arrangement of the preheating device, when the preheating device works, high-temperature flue gas transmits heat to materials in an overhead stock bin through a flue and a heat exchanger pipe on a mounting plate, at the beginning, sliding blocks are located in sliding grooves, limiting blocks are located in clamping holes, and when adjustment or maintenance is conducted, external force enables the sliding blocks to move, and springs stretch out and draw back; during normal preheating, heat is transmitted to the heat exchanger pipe through the mounting plate, the heat is transmitted to materials through the pipe wall after the temperature of a heat exchange medium is increased, waste heat of the AOD furnace is utilized, the energy efficiency is improved, waste is reduced, the position of the heat exchanger pipe can be flexibly adjusted according to the actual situation through the adjustable mounting structure, and the heat exchange efficiency is improved. And it is ensured that the preheating effect is optimal.

Description

Technical Field

[0001] The present invention relates to the technical field related to AOD furnaces, and in particular to a device for recovering and utilizing waste heat from high-temperature flue gas from an AOD furnace. Background Art

[0002] The AOD furnace high-level silo currently mainly stores lime, ferrosilicon, fluorite, high-carbon ferrochrome and other production raw and auxiliary materials. In the current operation process, these materials are not baked, but are directly transported to the high-level silo for storage and used directly in the production process. During the production process of the AOD furnace, a large amount of flue gas will be generated. The flue gas is first cooled by a water-cooled flue, then dusted by a filter bag, and finally discharged directly into the atmosphere. However, in this process, a large amount of waste heat contained in the flue gas has not been effectively utilized. This waste of heat not only leads to energy loss, but also does not meet the modern industry's energy requirements. The requirements of efficient utilization and energy conservation and emission reduction, specifically, raw and auxiliary materials such as lime, ferrosilicon, fluorite, and high-carbon ferrochrome enter the high-level silo without baking. When they participate in the reaction in the subsequent AOD furnace production, due to their own low temperature, they may have a certain impact on the efficiency of the entire reaction process. The flue gas generated during the production of the AOD furnace has a high temperature and can be recycled as a valuable energy source. However, it is currently only discharged after being cooled by a water-cooled flue and dust-removed by a filter bag. The waste heat is lost to the atmosphere with the flue gas. Therefore, a device for recovering and utilizing waste heat from high-temperature flue gas from an AOD furnace is particularly needed.

[0003] However, the raw and auxiliary materials of the existing AOD furnace have not been baked and have a high water content. After being added to the molten steel, the hydrogen content of the molten steel can reach 8-12PPm. The excessively high hydrogen content of the molten steel causes porosity defects in the ingot after continuous casting, seriously affecting the quality of the ingot. The flue gas generated during AOD production can reach over 800°C, and the waste heat of the flue gas is not fully utilized. It is discharged into the atmosphere after water cooling and dust removal by filter bags, resulting in energy waste. Summary of the invention

[0004] The purpose of the present invention is to provide an AOD furnace high-temperature flue gas waste heat recovery device to solve the problem of an existing AOD furnace high-temperature flue gas waste heat recovery device proposed in the above background technology. However, the raw and auxiliary materials of the existing AOD furnace have not been baked and have a high water content. After being added to molten steel, the hydrogen content of the molten steel can reach 8-12PPm. The excessively high hydrogen content of the molten steel causes porosity defects in the ingot after continuous casting, seriously affecting the quality of the ingot. The flue gas generated during AOD production can reach above 800°C, and the waste heat of the flue gas cannot be fully utilized. After being cooled by water and dusted by filter bags, it is discharged into the atmosphere, resulting in energy waste.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an AOD furnace high-temperature flue gas waste heat recovery and utilization device, comprising an AOD furnace, a support leg is fixedly connected to the outer surface of the bottom end of the AOD furnace, a gasket is fixedly connected to the bottom surface of the support leg, a smoke outlet pipe is fixedly connected to one side surface of the AOD furnace, a connecting plate is fixedly connected to the outer surface of the smoke outlet pipe, a fixing bolt is fixedly connected to the surface of the connecting plate, a flue is fixedly connected to the outer surface of the connecting plate, a high-level silo is fixedly connected to the upper surface of the flue, a preheating device is provided on the inner surface of the flue, a filtering device is provided on one end surface of the flue, and the preheating device passes through the bottom of the high-level silo; The preheating device includes a slide groove, a mounting plate, a slider, a heat exchanger tube, a clamping hole, a telescopic spring, a limit plate, a limit block and a limit hole. The inner wall surface of the flue is provided with a slide groove, and the inner surface of the flue is slidably connected with a mounting plate. The two side surfaces of the mounting plate are fixedly connected with sliders. The inner wall surface of the mounting plate is fixedly connected with a heat exchanger tube. The inner wall surface of the slider is provided with a clamping hole, and one end surface of the inner wall of the clamping hole is fixedly connected with a telescopic spring. One end surface of the telescopic spring is fixedly connected with a limit plate, and one end surface of the limit plate is fixedly connected with a limit block. The inner wall surface of the slide groove is provided with a limit hole, and the heat exchanger tube passes through the bottom of the high-level silo.

[0006] Preferably, the support legs are arranged in multiple groups at equal intervals around the center of the AOD furnace, and gaskets are arranged on the bottom surface of each group of support legs.

[0007] Preferably, a plurality of fixing bolts are arranged on the surface of the connection plate, and the flue is fixedly connected to the smoke outlet pipe via the connection plate and the fixing bolts.

[0008] Preferably, the high-position silos are arranged in multiple groups on the surface of the flue, and the multiple groups of high-position silos are arranged in two rows with six groups on the surface of the flue.

[0009] Preferably, the slide grooves are arranged on both sides of the inner wall of the flue, and a plurality of mounting plates are arranged on the inner wall of the flue.

[0010] Preferably, a plurality of groups of heat exchanger tubes are arranged inside the flue, and each group of heat exchanger tubes penetrates the bottom of the high-level silo.

[0011] Preferably, the limit plate cooperates with the limit block through a telescopic spring to form a telescopic structure, the position of the limit block corresponds to the position of the limit hole, and the outer wall size of the limit block matches the inner wall size of the limit hole.

[0012] Preferably, the filtering device includes a bottom box, a built-in filter box, a sealing cover, a filter box handle, a handle, meltblown cloth, a bottom filter plate, a sponge pad, a top filter plate and a recovery pipe, the surface of one end of the flue is fixedly connected to the bottom box, the inner wall surface of the bottom box is slidably connected to the built-in filter box, the top surface of the built-in filter box is slidably connected to the sealing cover, the top two side surfaces of the top of the built-in filter box are fixedly connected to the filter box handles, the top surface of the sealing cover is fixedly connected to the handle, the bottom of the inner wall of the built-in filter box is provided with meltblown cloth, the inner wall surface of the built-in filter box is slidably connected to the bottom filter plate, the upper surface of the bottom filter plate is fixedly connected to the sponge pad, the upper surface of the sponge pad is fixedly connected to the top filter plate, and the recovery pipe is fixedly connected to one side surface of the bottom box.

[0013] Preferably, the outer wall size of the built-in filter box matches the inner wall size of the bottom box, and activated carbon is installed under the meltblown cloth.

[0014] Preferably, the bottom filter plates, sponge pads and top filter plates are arranged in multiple groups inside the built-in filter box, and the filter plates, sponge pads and top filter plates in each group are distributed at equal intervals.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the AOD furnace high-temperature flue gas waste heat recovery and utilization device, through the setting of the preheating device, when it is necessary to preheat the material in the high-level silo, the flue gas containing high-temperature waste heat passes through the flue, at this time, the mounting plate installed inside the flue and the heat exchanger tube thereon begin to play a role, the heat exchanger tube passes through the bottom of the high-level silo, so that the heat can be effectively transferred to the material in the high-level silo, in the initial state, the slider is located in the slide groove, the telescopic spring is in a naturally extended or compressed state, the limit block is partially or completely located in the card hole, when it is necessary to adjust the position of the heat exchanger tube or perform inspection and maintenance, an external force is applied to the mounting plate, this external force causes the slider to move in the slide groove, and the telescopic spring will be compressed or stretched accordingly. When the slider moves to a certain position so that the limit block corresponds to the limit hole on the slide slot, the limit block will be inserted into the limit hole under the elastic force of the telescopic spring, thereby fixing the mounting plate in a new position. During normal preheating operation, high-temperature flue gas flows in the flue, and heat is transferred to the heat exchanger tube through the mounting plate. The heat exchange medium inside the heat exchanger tube absorbs heat and its temperature rises. The heat is then transferred to the material in the high-level silo through the tube wall of the heat exchanger tube, thereby realizing preheating of the material. In this way, the waste heat in the high-temperature flue gas of the AOD furnace is effectively utilized, the energy utilization efficiency is improved, and the energy waste is reduced. Moreover, this adjustable mounting structure enables the heat exchanger tube to flexibly adjust its position according to actual conditions, thereby ensuring the optimization of the preheating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the structure of the left side view of the appearance of the present invention; Figure 3 This is a schematic diagram of the structure of the right side view of the appearance of the present invention; Figure 4 It is a schematic cross-sectional structure diagram of the preheating device of the present invention; Figure 5 This is a schematic cross-sectional view of the filter device of the present invention; Figure 6 This is a schematic diagram of the structure of the bottom filter plate, the top filter plate and the sponge pad cooperating with each other in the present invention; Figure 7 For the present invention Figure 4 Enlarged structural diagram at A in the middle.

[0017] In the figure: 1. AOD furnace; 2. supporting legs; 3. gasket; 4. smoke outlet pipe; 5. connecting plate; 6. fixing bolt; 7. flue; 8. high-level silo; 9. preheating device; 901. slide; 902. mounting plate; 903. slider; 904. heat exchanger tube; 905. clamping hole; 906. telescopic spring; 907. limit plate; 908. limit block; 909. limit hole; 10. filter device; 1001. bottom box; 1002. built-in filter box; 1003. sealing cover; 1004. filter box handle; 1005. handle; 1006. meltblown cloth; 1007. bottom filter plate; 1008. sponge pad; 1009. top filter plate; 1010. recovery pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-7 The present invention provides a technical solution: an AOD furnace high-temperature flue gas waste heat recovery and utilization device, comprising an AOD furnace 1, a support leg 2 is fixedly connected to the outer surface of the bottom end of the AOD furnace 1, a gasket 3 is fixedly connected to the bottom surface of the support leg 2, a smoke outlet pipe 4 is fixedly connected to one side surface of the AOD furnace 1, a connecting plate 5 is fixedly connected to the outer surface of the smoke outlet pipe 4, a fixing bolt 6 is fixedly connected to the surface of the connecting plate 5, a flue 7 is fixedly connected to the outer surface of the connecting plate 5, a high-level silo 8 is fixedly connected to the upper surface of the flue 7, a preheating device 9 is arranged on the inner surface of the flue 7, a filtering device 10 is arranged on one end surface of the flue 7, and the preheating device 9 passes through the bottom of the high-level silo 8; The preheating device 9 includes a slide groove 901, a mounting plate 902, a slider 903, a heat exchanger tube 904, a clamping hole 905, a telescopic spring 906, a limit plate 907, a limit block 908 and a limit hole 909. The inner wall surface of the flue 7 is provided with a slide groove 901, the inner surface of the flue 7 is slidably connected with the mounting plate 902, the two side surfaces of the mounting plate 902 are fixedly connected with the slider 903, the inner wall surface of the mounting plate 902 is fixedly connected with the heat exchanger tube 904, the inner wall surface of the slider 903 is provided with a clamping hole 905, one end surface of the inner wall of the clamping hole 905 is fixedly connected with the telescopic spring 906, and one end surface of the telescopic spring 906 is fixedly connected with the inner wall surface of the mounting plate 902. The limiting plate 907 is fixedly connected, and one end surface of the limiting plate 907 is fixedly connected to the limiting block 908. The inner wall surface of the slide 901 is provided with a limiting hole 909. The heat exchanger tube 904 passes through the bottom of the high-level silo 8. Through the setting of the preheating device 9, when it is necessary to preheat the material in the high-level silo, the flue gas containing high-temperature waste heat passes through the flue 7. At this time, the mounting plate 902 installed inside the flue 7 and the heat exchanger tube 904 thereon begin to play a role. The heat exchanger tube 904 passes through the bottom of the high-level silo 8, so that the heat can be effectively transferred to the material in the high-level silo. In the initial state, the slider 903 is located in the slide In 901, the telescopic spring 906 is in a naturally extended or compressed state, and the limit block 908 is partially or completely located in the clamping hole 905. When it is necessary to adjust the position of the heat exchanger tube 904 or perform maintenance, an external force is applied to the mounting plate 902, and this external force causes the slider 903 to move in the slide groove 901. At this time, the telescopic spring 906 will be compressed or stretched accordingly. When the slider 903 moves to a certain position so that the limit block 908 corresponds to the limit hole 909 on the slide groove 901, under the elastic force of the telescopic spring 906, the limit block 908 will be inserted into the limit hole 909, thereby fixing the mounting plate 902 in In the new position, during the normal preheating process, the high-temperature flue gas flows in the flue 7, and the heat is transferred to the heat exchanger tube 904 through the mounting plate 902. The heat exchange medium inside the heat exchanger tube 904 absorbs the heat and its temperature rises. The heat is then transferred to the material in the high-level silo 8 through the tube wall of the heat exchanger tube 904, thereby realizing the preheating of the material. In this way, the waste heat in the high-temperature flue gas of the AOD furnace is effectively utilized, the energy utilization efficiency is improved, and the energy waste is reduced. In addition, this adjustable mounting structure enables the heat exchanger tube 904 to flexibly adjust its position according to actual conditions, thereby ensuring the optimization of the preheating effect.

[0020] Furthermore, a plurality of groups of support legs 2 are arranged at equal intervals around the center of the AOD furnace 1, and gaskets 3 are arranged on the bottom surface of each group of support legs 2. The arrangement of the support legs 2 and the gaskets 3 ensures that the AOD furnace 1 is subjected to uniform force during operation and can be stably placed in the working area, effectively preventing the furnace body from tilting or shaking due to uneven force, thereby ensuring the safety of the production process. The gaskets 3 can increase the contact area between the support legs 2 and the ground, reduce the local pressure of the ground reaction force on the support legs 2, prevent the support legs 2 from being deformed or damaged due to long-term pressure, and can also buffer the vibration generated during the operation of the equipment to a certain extent, further improving the stability of the equipment.

[0021] Furthermore, multiple groups of fixing bolts 6 are arranged on the surface of the connecting plate 5, and the flue 7 is fixedly connected to the smoke outlet pipe 4 through the connecting plate 5 and the fixing bolts 6. Through the arrangement of the fixing bolts 6, multiple groups of fixing bolts 6 can make the connection between the flue 7 and the smoke outlet pipe 4 more secure, effectively preventing the connection between the flue 7 and the smoke outlet pipe 4 from loosening or falling off under complex working conditions such as high temperature, high pressure and smoke flow, thereby ensuring the sealing and integrity of the entire flue gas emission and waste heat recovery system.

[0022] Furthermore, multiple groups of high-level silos 8 are arranged on the surface of the flue 7, and the multiple groups of high-level silos 8 are arranged in two rows with six groups on the surface of the flue 7. Through the arrangement of the high-level silos 8, more materials can contact the heat exchanger tubes 904 in the flue 7 at the same time, thereby increasing the capacity of the preheated materials and improving the efficiency of waste heat utilization, so that the waste heat generated in the production process of the AOD furnace 1 can be more fully utilized, thereby reducing energy waste.

[0023] Furthermore, the slide grooves 901 are arranged on both sides of the inner wall of the flue 7, and multiple groups of mounting plates 902 are arranged on the inner wall of the flue 7. Through the arrangement of the slide grooves 901 and the mounting plates 902, the design of the double-sided slide grooves 901 can make the mounting plates 902 more stably installed in the flue 7, ensuring that the heat exchanger tubes 904 are more evenly distributed in the flue 7, so that the materials are heated more evenly during the preheating process, avoiding the impact of local overheating or uneven heat distribution on the preheating quality of the materials and the subsequent production process.

[0024] Furthermore, multiple groups of heat exchanger tubes 904 are arranged inside the flue 7, and each group of heat exchanger tubes 904 passes through the bottom of the high-level silo 8. Through the arrangement of the heat exchanger tubes 904, multiple groups of heat exchanger tubes 904 can preheat the materials in the high-level silo 8 at the same time, increasing the area and path of heat transfer, so that the materials can absorb heat more quickly and evenly, further improving the preheating effect of the materials, thereby shortening the time required for the materials to reach the reaction temperature in the AOD furnace 1 and improving production efficiency.

[0025] Furthermore, the limit plate 907 cooperates with the limit block 908 through the telescopic spring 906 to form a telescopic structure. The position of the limit block 908 corresponds to the position of the limit hole 909, and the outer wall size of the limit block 908 is consistent with the inner wall size of the limit hole 909. Through the arrangement of the telescopic spring 906 and the limit block 908, the mounting plate 902 can be easily adjusted in the flue 7, so as to facilitate maintenance operations such as inspection, replacement or cleaning of the heat exchanger tube 904. When the position of the heat exchanger tube 904 needs to be adjusted, it is only necessary to overcome the elastic force of the telescopic spring 906 to make the limit block 908 disengage from the limit hole 909, and then the mounting plate 902 can be moved. The operation is simple and quick, which is conducive to reducing the time and cost of equipment maintenance.

[0026] Further, the filtering device 10 includes a bottom box 1001, a built-in filter box 1002, a sealing cover 1003, a filter box handle 1004, a handle 1005, a melt-blown cloth 1006, a bottom filter plate 1007, a sponge pad 1008, a top filter plate 1009 and a recovery pipe 1010, one end surface of the flue 7 is fixedly connected to the bottom box 1001, the inner wall surface of the bottom box 1001 is slidably connected to the built-in filter box 1002, the top surface of the built-in filter box 1002 is slidably connected to the sealing cover 1003, the top two sides of the built-in filter box 1002 are fixedly connected to the filter box handle 1004, the top surface of the sealing cover 1003 is fixedly connected to the handle 1005, the built-in filter box 1002 A meltblown cloth 1006 is arranged at the bottom of the inner wall, a bottom filter plate 1007 is slidably connected to the inner wall surface of the built-in filter box 1002, a sponge pad 1008 is fixedly connected to the upper surface of the bottom filter plate 1007, a top filter plate 1009 is fixedly connected to the upper surface of the sponge pad 1008, a recovery pipe 1010 is fixedly connected to one side surface of the bottom box 1001, and through the setting of the filtering device 10, when the flue gas with impurities enters the bottom box 1001 from the flue 7, the filtering process begins. First, the flue gas will directly contact the meltblown cloth 1006 in the built-in filter box 1002. The meltblown cloth 1006 has extremely small pores and can intercept most of the fine solid particles. These particles are captured by the meltblown cloth. The flue gas is purified in one step. Then, the flue gas filtered by the meltblown cloth 1006 flows upward and passes through the bottom filter plate 1007. The bottom filter plate 1007 can block larger particles of impurities and further remove solid components in the flue gas. At this time, the sponge pad 1008 plays a role. It has a rich pore structure and can absorb some gaseous pollutants and residual fine particles in the flue gas, thereby enhancing the filtering effect. The top filter plate 1009 serves as the last line of defense to filter the flue gas filtered by the sponge pad 1008 again to ensure that the flue gas contains as few impurities as possible. During the filtering process, as impurities are continuously captured by each filter layer, the filtering effect gradually decreases. When the filter device 10 needs to be repaired, During maintenance and cleaning, the built-in filter box 1002 can be pulled out of the bottom box 1001 by pulling the filter box handle 1004, and the sealing cover 1003 can be opened and the meltblown cloth 1006, the bottom filter plate 1007, the sponge pad 1008 and the top filter plate 1009 can be easily cleaned or replaced by lifting the handle 1005. The recovery pipe 1010 on one side of the bottom box 1001 collects and discharges the liquid or adsorbed pollutants that may be generated during the filtration process. These collected substances can be transported to special processing equipment through the recovery pipe 1010 for subsequent processing to prevent secondary pollution to the environment, while also enabling the filter device 10 to operate continuously and effectively.

[0027] Furthermore, the outer wall size of the built-in filter box 1002 is consistent with the inner wall size of the bottom box 1001, and activated carbon is installed under the meltblown cloth 1006. Through the arrangement of the bottom box 1001, the built-in filter box 1002 and the meltblown cloth 1006, the outer wall size of the built-in filter box 1002 is consistent with the inner wall size of the bottom box 1001. Such a design can ensure that during the filtering process, the flue gas can only be filtered through the filter material in the built-in filter box 1002, avoiding the "escape" of the flue gas from the gap between the two, ensuring the integrity and efficiency of the filtration. Activated carbon has a strong adsorption capacity and can absorb odors, harmful gases and some volatile organic compounds in the flue gas that are difficult to remove by the meltblown cloth 1006. When used in conjunction with the meltblown cloth 1006, the removal ability of the entire filter device 10 for different types of pollutants is greatly enhanced, further improving the filtering effect and making the exhaust gas cleaner.

[0028] Furthermore, multiple groups of bottom filter plates 1007, sponge pads 1008 and top filter plates 1009 are arranged inside the built-in filter box 1002, and each group of filter plates 1007, sponge pads 1008 and top filter plates 1009 are evenly spaced. Through the arrangement of the bottom filter plates 1007, sponge pads 1008 and top filter plates 1009, the multi-layer filtering structure is like a multi-layer filter screen, and each layer can remove impurities of a specific size and type, from large particles to fine particles and gaseous pollutants, filtering layer by layer to finely treat the flue gas to ensure that the final discharged gas meets environmental protection requirements.

[0029] Working principle: AOD furnace 1 generates high-temperature flue gas during operation, and the high-temperature flue gas is discharged through the smoke outlet pipe 4. The smoke outlet pipe 4 is firmly connected to the flue 7 by means of the connecting plate 5 and the fixing bolt 6, ensuring that the flue gas can smoothly enter the flue 7. When the high-temperature flue gas enters the flue 7, the mounting plate 902 installed inside the flue 7 and the heat exchanger tube 904 thereon begin to play a role. The heat exchanger tube 904 passes through the bottom of the high-level silo 8, so that the heat can be effectively transferred to the material in the high-level silo. In the initial state, the slider 903 is located in the slide groove 901, the telescopic spring 906 is in a natural extension or compression state, and the limit block 908 is partially or completely located in the clamping hole 905. When it is necessary to adjust the position of the heat exchanger tube 904 or perform maintenance, An external force is applied to the mounting plate 902, and this external force causes the slider 903 to move in the slide groove 901. At this time, the telescopic spring 906 will be compressed or stretched accordingly. When the slider 903 moves to a certain position, so that the limit block 908 corresponds to the limit hole 909 on the slide groove 901, under the elastic force of the telescopic spring 906, the limit block 908 will be inserted into the limit hole 909, thereby fixing the mounting plate 902 in the new position. During the normal preheating operation, the high-temperature flue gas flows in the flue 7, and the heat is transferred to the heat exchanger tube 904 through the mounting plate 902. The heat exchange medium inside the heat exchanger tube 904 absorbs the heat and the temperature rises. The heat is then transferred to the material in the high-level silo 8 through the tube wall of the heat exchanger tube 904, thereby achieving In this way, the waste heat in the high-temperature flue gas of the AOD furnace is effectively utilized, the energy utilization efficiency is improved, and the energy waste is reduced. Moreover, the adjustable installation structure enables the heat exchanger tube 904 to flexibly adjust the position according to the actual situation, thereby ensuring the optimization of the preheating effect. The flue gas after the preheating device 9 continues to flow in the flue 7, and then enters the filtering device 10. In the filtering device 10, the flue gas first enters the built-in filter box 1002 in the bottom box 1001. The meltblown cloth 1006 in the built-in filter box 1002 will intercept the fine solid particles in the flue gas, and the activated carbon below it can absorb odors and harmful gases. Then, the bottom filter plate 1007 blocks the larger particles of impurities, and the sponge pad 1008 absorbs Gaseous pollutants and residual fine particles are filtered again by the top filter plate 1009. Since the outer wall size of the built-in filter box 1002 is consistent with the inner wall size of the bottom box 1001, it is ensured that the flue gas can only be filtered through the filter material, and the bottom filter plate 1007, sponge pad 1008 and top filter plate 1009 are arranged in multiple groups and at equal intervals, realizing multi-layer fine filtration. The clean gas after filtration is discharged from the filter device 10, and the liquid or adsorbed pollutants generated during the filtration process can be collected and processed through the recovery pipe 1010. During the operation of the whole device, the support legs 2 and the gasket 3 provide stable support for the AOD furnace 1 to ensure the safety of the equipment operation. Through the coordinated work of the preheating device 9 and the filter device 10,It not only realizes the recovery and utilization of high-temperature flue gas waste heat, improves energy utilization efficiency, but also ensures the cleanliness of exhaust gas and reduces environmental pollution, thus completing the use process of an AOD furnace high-temperature flue gas waste heat recovery and utilization device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An AOD furnace high temperature flue gas waste heat recovery and utilization device, comprising an AOD furnace (1), Features: The outer surface of the bottom end of the AOD furnace (1) is fixedly connected to a support leg (2), the bottom surface of the support leg (2) is fixedly connected to a gasket (3), a side surface of the AOD furnace (1) is fixedly connected to a smoke outlet pipe (4), the outer surface of the smoke outlet pipe (4) is fixedly connected to a connection plate (5), the surface of the connection plate (5) is fixedly connected to a fixing bolt (6), the outer surface of the connection plate (5) is fixedly connected to a flue (7), the upper surface of the flue (7) is fixedly connected to a high-level silo (8), the inner surface of the flue (7) is provided with a preheating device (9), one end surface of the flue (7) is provided with a filtering device (10), and the preheating device (9) passes through the bottom of the high-level silo (8); The preheating device (9) comprises a slide groove (901), a mounting plate (902), a slider (903), a heat exchanger tube (904), a clamping hole (905), a telescopic spring (906), a limit plate (907), a limit block (908) and a limit hole (909); the slide groove (901) is provided on the inner wall surface of the flue (7); the inner surface of the flue (7) is slidably connected to the mounting plate (902); the sliders (903) are fixedly connected to the two side surfaces of the mounting plate (902); the inner wall of the mounting plate (902) is provided with a slide groove (901); A heat exchanger tube (904) is fixedly connected to the surface, a clamping hole (905) is provided on the inner wall surface of the slider (903), a telescopic spring (906) is fixedly connected to one end surface of the inner wall of the clamping hole (905), one end surface of the telescopic spring (906) is fixedly connected to a limit plate (907), one end surface of the limit plate (907) is fixedly connected to a limit block (908), a limit hole (909) is provided on the inner wall surface of the slide groove (901), and the heat exchanger tube (904) passes through the bottom of the high-level silo (8).

2. According to claim 1, a device for recovering and utilizing waste heat from high-temperature flue gas of an AOD furnace, Features: The support legs (2) are arranged in multiple groups at equal intervals around the center of the AOD furnace (1), and a gasket (3) is arranged on the bottom surface of each group of support legs (2).

3. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 1, Features: The fixing bolts (6) are arranged in multiple groups on the surface of the connection plate (5), and the flue (7) is fixedly connected to the smoke outlet pipe (4) via the connection plate (5) and the fixing bolts (6).

4. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 1, Features: The high-position silos (8) are arranged in multiple groups on the surface of the flue (7), and the multiple groups of high-position silos (8) are arranged in two rows, with six groups on the surface of the flue (7).

5. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 1, Features: The slide grooves (901) are arranged on both sides of the inner wall of the flue (7), and a plurality of mounting plates (902) are arranged on the inner wall of the flue (7).

6. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 1, Features: A plurality of groups of heat exchanger tubes (904) are arranged inside the flue (7), and each group of heat exchanger tubes (904) penetrates the bottom of the high-level silo (8).

7. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 1, Features: The limiting plate (907) cooperates with the limiting block (908) through the telescopic spring (906) to form a telescopic structure; the position of the limiting block (908) corresponds to the position of the limiting hole (909), and the outer wall size of the limiting block (908) matches the inner wall size of the limiting hole (909).

8. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 1, Features: The filtering device (10) comprises a bottom box (1001), a built-in filter box (1002), a sealing cover (1003), a filter box handle (1004), a handle (1005), a melt-blown cloth (1006), a bottom filter plate (1007), a sponge pad (1008), a top filter plate (1009) and a recovery pipe (1010); one end surface of the flue (7) is fixedly connected to the bottom box (1001); the inner wall surface of the bottom box (1001) is slidably connected to the built-in filter box (1002); the top surface of the built-in filter box (1002) is slidably connected to the sealing cover (1003); the built-in filter box (1001) is fixedly connected to the top surface of the built-in filter box (1002); 02) are fixedly connected to filter box handles (1004) on both sides of the top end surface, the sealing cover (1003) is fixedly connected to a handle (1005), the bottom of the inner wall of the built-in filter box (1002) is provided with a meltblown cloth (1006), the inner wall surface of the built-in filter box (1002) is slidably connected to a bottom filter plate (1007), the upper surface of the bottom filter plate (1007) is fixedly connected to a sponge pad (1008), the upper surface of the sponge pad (1008) is fixedly connected to a top filter plate (1009), and one side surface of the bottom box (1001) is fixedly connected to a recovery pipe (1010).

9. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 8, Features: The outer wall size of the built-in filter box (1002) matches the inner wall size of the bottom box (1001), and activated carbon is installed below the meltblown cloth (1006).

10. The AOD furnace high temperature flue gas waste heat recovery and utilization device according to claim 8, Features: The bottom filter plate (1007), the sponge pad (1008) and the top filter plate (1009) are arranged in multiple groups inside the built-in filter box (1002), and each group of filter plates (1007), sponge pads (1008) and top filter plates (1009) are evenly spaced.

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