A flue gas sealing device for a ring cooler

Abstract

This invention provides a flue gas sealing device for an annular cooler, relating to the field of annular cooler technology. The annular cooler includes an upper fume hood, a lower air duct, and a trolley. The annular cooler also includes a waste heat recovery system, which comprises a waste heat boiler, a circulating pipeline, and a circulating fan. The flue gas sealing device includes branch pipes and jet pipes. The inlet of the waste heat boiler is connected to the high-temperature flue gas recovery port of the upper fume hood, and the outlet of the waste heat boiler is connected to one end of the circulating pipeline. The other end of the circulating pipeline is connected to the lower air duct. The circulating fan is mounted on the circulating pipeline. One end of the branch pipe is connected to the circulating pipeline, and the other end of the branch pipe is connected to the jet pipe. The jet pipe is located on the inner side of the top wall of the upper fume hood and is used to spray air to form an air curtain to isolate the high-temperature section and the low-temperature section of the annular cooler. This system can improve the recovery rate of high-temperature flue gas.

Description

Technical Field

[0001] This invention relates to the field of annular cooler technology, and more specifically, to a flue gas sealing device for annular coolers. Background Technology

[0002] The waste heat recovery system for the annular cooler involves adding a waste heat boiler and circulating fans to recover the high-temperature flue gas generated during the cooling of hot sintered ore in the annular cooler. The recovered high-temperature flue gas is then transported to the waste heat boiler for heat exchange to generate steam, which is then sent to a steam turbine generator set to generate electricity. This waste heat recovery reduces the amount of flue gas and heat emitted into the atmosphere from the annular cooler, while also recovering and reusing the waste heat from the high-temperature flue gas, thus reducing the energy consumption and carbon dioxide emissions of steel enterprises. Steel companies will further increase their internal waste heat recovery efforts and will gradually expand their work on waste heat recovery from annular coolers.

[0003] In existing waste heat recovery systems for annular coolers, to reduce the overflow of high-temperature flue gas and increase its recovery rate, a flue gas baffle is typically welded and installed on the upper fume hood of the annular cooler between the high-temperature and low-temperature sections. This baffle prevents high-temperature flue gas from leaking into the low-temperature section as the hot sintered ore on the annular cooler trolley moves. However, the thickness of the sintered ore on the annular cooler trolley is uneven after it falls from the sintering machine, and the thickness of the material layer also changes with the production load. If the lower edge of the flue gas baffle installed on the upper fume hood is too low, it will trap the sintered ore in the thicker parts of the material layer, affecting the normal operation of the annular cooler. If the lower edge of the baffle is too high, it will reduce the flue gas isolation and sealing effect, causing the loss of high-temperature flue gas and reducing its recovery rate. Summary of the Invention

[0004] The present invention aims to solve the problem that existing flue gas dampers have poor sealing effect on flue gas in annular coolers.

[0005] To address the aforementioned problems, this invention provides a flue gas sealing device for an annular cooler. The annular cooler includes an upper fume hood, a lower duct, and a trolley. The trolley is rotatably connected to the top of the lower duct, and the upper fume hood is fixedly and sealingly connected to the top of the lower duct, covering the trolley. The annular cooler also includes a waste heat recovery system, comprising a waste heat boiler, circulating pipes, and a circulating fan. The flue gas sealing device for the annular cooler includes branch pipes and injection pipes. The waste heat boiler's inlet... The outlet is connected to the high-temperature flue gas recovery port of the upper fume hood, the outlet of the waste heat boiler is connected to one end of the circulation pipe, the other end of the circulation pipe is connected to the lower air duct, the circulation fan is installed on the circulation pipe, one end of the branch pipe is connected to the circulation pipe and located on the side of the air outlet of the circulation fan, the other end of the branch pipe is connected to the jet pipe, the jet pipe is installed on the inner side of the top wall of the upper fume hood, and the jet pipe is used to spray to form an air curtain to isolate the high-temperature section and the low-temperature section of the ring cooler.

[0006] The present invention provides a flue gas sealing device for an annular cooler, which, compared with the prior art, has, but is not limited to, the following technical advantages:

[0007] High-temperature ore in the sintering machine can fall from the upper fume hood into the operating trolley. As the trolley rotates, the high-temperature ore is gradually laid on the trolley from the discharge port. Under the action of the circulating fan, a negative pressure is formed near the inlet of the waste heat boiler, which draws the high-temperature flue gas from the high-temperature section of the annular cooler into the waste heat boiler through the high-temperature flue gas recovery port of the upper fume hood for heat exchange. After heat exchange, the flue gas with a lower temperature enters the circulating fan from the upper part of the waste heat boiler along the circulating pipe, and is then sent into the lower air duct by the circulating fan. The flue gas with a lower temperature passes through the ore layer in the lower air duct to cool it and generate high-temperature flue gas. The high-temperature flue gas then enters the waste heat boiler for circulating heat exchange, realizing the recovery and utilization of waste heat. In addition, in this invention, a branch pipe is connected to the circulation pipe at the outlet of the circulating fan. Most of the flue gas at the outlet of the circulating fan enters the lower air duct from the circulation pipe to participate in the circulating cooling of the ore. A small portion of the flue gas at the outlet of the circulating fan enters the blowpipe on the inner side of the upper fume hood through the branch pipe. This portion of flue gas is finally sprayed downwards by the blowpipe to form an air curtain. This air curtain can extend to the ore layer. The blowpipe can be positioned between the high-temperature section and the low-temperature section of the annular cooler, so that the air curtain formed by the blowpipe can completely cool the high-temperature section of the annular cooler. The high-temperature section and the low-temperature section of the annular cooler are sealed and isolated, preventing the high-temperature flue gas from the high-temperature section of the annular cooler from moving to the low-temperature section area with the movement of the trolley. This ensures that the high-temperature flue gas in the high-temperature section of the annular cooler can be completely absorbed and utilized by the waste heat boiler. Furthermore, since the power source for the formation of the air curtain is the circulating fan, and the gas comes from the diversion of flue gas in the circulating pipe, no additional power source or additional gas is required. Moreover, the air curtain can be formed when the circulating fan is started and disappear when the circulating fan is turned off, without the need for additional structures to control its formation or disappearance. This results in lower costs and energy conservation and environmental protection.

[0008] Furthermore, the blowpipe extends along the width direction of the upper fume hood, the length of the blowpipe is equal to the width of the upper fume hood, and the bottom of the blowpipe has a blowhole extending along its length direction.

[0009] Furthermore, the design flue gas volume of the circulating fan is 280,000 Nm³. 3 / h, the diameter of the circulation pipe is DN2400, the diameter of the branch pipe is DN100, the diameter of the blow pipe is less than or equal to the diameter of the branch pipe, the length of the blow pipe is 3600mm, and the width of the blow nozzle is 3mm.

[0010] Furthermore, the flue gas sealing device for the annular cooler also includes a slide rail, a metal hose, and a moving device. The slide rail is located inside the upper fume hood, and its length extends along the movement direction of the trolley. The blowpipe is slidably connected to the slide rail, and the blowpipe is connected to the branch pipe through the metal hose. The moving device is used to drive the blowpipe to move along the slide rail.

[0011] Furthermore, a sealing structure is provided between the blow pipe and the inner wall of the top of the upper fume hood.

[0012] Furthermore, along the length of the slide rail, the inner wall of the upper fume hood is provided with multiple temperature detection devices.

[0013] Furthermore, the moving device includes a hydraulic cylinder, the cylinder body of which is fixed to the inner wall of the upper fume hood, and the piston rod of which is connected to the blowpipe.

[0014] Furthermore, the moving device includes a motor, a drum, a first wire rope, and a second wire rope. The top wall of the upper fume hood is provided with a first rope hole and a second rope hole at both ends of the slide rail. The motor is arranged on the outer side of the top wall of the upper fume hood between the first rope hole and the second rope hole. The drum is coaxially connected to the motor. One end of the first wire rope is connected to the drum, and the other end of the first wire rope passes through the first rope hole and is connected to one side of the blowpipe. One end of the second wire rope is connected to the drum, and the other end of the second wire rope passes through the second rope hole and is connected to the other side of the blowpipe. When the motor rotates, one of the first wire rope and the second wire rope is wound by the drum, and the other of the first wire rope and the second wire rope is released by the drum.

[0015] Furthermore, the moving device also includes a first fixed pulley, a second fixed pulley, a third fixed pulley, and a fourth fixed pulley. The first fixed pulley and the second fixed pulley are respectively disposed on the inner and outer sides of the upper smoke hood top wall, and both the first fixed pulley and the second fixed pulley are close to the first rope hole. The third fixed pulley and the fourth fixed pulley are respectively disposed on the inner and outer sides of the upper smoke hood top wall, and both the third fixed pulley and the fourth fixed pulley are close to the second rope hole. The first steel wire rope cooperates with the first fixed pulley and the second fixed pulley, and the second steel wire rope cooperates with the third fixed pulley and the fourth fixed pulley.

[0016] Furthermore, the flue gas sealing device for the annular cooler also includes a steel cable, the two ends of which are respectively connected to the inner side of the top wall of the upper fume hood, and the metal hose is provided with multiple connecting rings along its length, and the multiple connecting rings are respectively sleeved on the steel cable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the flue gas sealing device for an annular cooler according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the mobile device according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 11. Upper fume hood; 111. High-temperature flue gas recovery port; 112. Material discharge port; 12. Lower air duct; 13. Trolley; 21. Waste heat boiler; 22. Circulation pipe; 23. Circulation fan; 24. Branch pipe; 25. Pulley pipe; 26. Metal hose; 271. Motor; 272. Drum; 273. First wire rope; 274. Second wire rope; 275. First fixed pulley; 276. Second fixed pulley; 277. Third fixed pulley; 278. Fourth fixed pulley; 28. Slide rail. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limiting this invention.

[0023] Furthermore, the direction indicated by arrow N in the attached drawing is the direction of movement of the trolley; the Z-axis in the attached drawing represents the vertical direction, that is, the up-down direction, and the positive direction of the Z-axis represents up, and the negative direction of the Z-axis represents down. It should also be noted that the aforementioned representation of the Z-axis is only for the convenience of describing the present invention and simplifying the description, and does 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 present invention.

[0024] See Figure 1-2This invention discloses a flue gas sealing device for an annular cooler. The annular cooler includes an upper fume hood 11, a lower air duct 12, and a trolley 13. The trolley 13 is rotatably connected to the top of the lower air duct 12, and the upper fume hood 11 is fixedly and sealingly connected to the top of the lower air duct 12, covering the trolley 13. The annular cooler also includes a waste heat recovery system, which includes a waste heat boiler 21, a circulation pipe 22, and a circulation fan 23. The flue gas sealing device for the annular cooler includes a branch pipe 24 and a jet pipe 25. The inlet of the waste heat boiler 21 is connected to the upper... The high-temperature flue gas recovery port 111 of the fume hood 11 is connected, the outlet of the waste heat boiler 21 is connected to one end of the circulation pipe 22, the other end of the circulation pipe 22 is connected to the lower air duct 12, the circulation fan 23 is installed on the circulation pipe 22, one end of the branch pipe 24 is connected to the circulation pipe 22 and is located on the side of the air outlet of the circulation fan 23, the other end of the branch pipe 24 is connected to the jet pipe 25, the jet pipe 25 is installed on the inner side of the top wall of the upper fume hood 11, and the jet pipe 25 is used to spray to form an air curtain to isolate the high-temperature section and the low-temperature section of the ring cooler.

[0025] In this embodiment, the high-temperature ore in the sintering machine can fall from the discharge port 112 of the upper fume hood 11 onto the operating trolley 13. As the trolley 13 operates, the high-temperature ore is gradually laid on the trolley 13 from the discharge port 112. Under the action of the circulating fan 23, a negative pressure is formed near the inlet of the waste heat boiler 21, which draws the high-temperature flue gas from the high-temperature section of the annular cooler into the waste heat boiler 21 from the high-temperature flue gas recovery port 111 of the upper fume hood 11 for heat exchange. After heat exchange, the flue gas with a lower temperature enters the circulating fan 23 from the upper part of the waste heat boiler 21 along the circulating pipe 22, and is then sent to the lower air duct 12 by the circulating fan 23. The flue gas with a lower temperature passes through the ore layer from the lower air duct 12 to cool it and generate high-temperature flue gas. The high-temperature flue gas then enters the waste heat boiler 21 for circulating heat exchange, realizing the recovery and utilization of waste heat. In addition, in this embodiment, a branch pipe is connected to the circulation pipe at the outlet of the circulating fan 23. Most of the flue gas at the outlet of the circulating fan 23 enters the lower air duct 12 through the circulation pipe 22 to participate in the circulation cooling of the ore. A small portion of the flue gas at the outlet of the circulating fan 23 enters the blowpipe 25 on the inner side of the top wall of the upper fume hood 11 through the branch pipe 24. This portion of flue gas is finally blown downward by the blowpipe 25 to form an air curtain. This air curtain can extend to the ore layer. The blowpipe 25 can be positioned between the high-temperature section and the low-temperature section of the circulating cooler, so that the air curtain formed by the blowpipe 25 can completely... The high-temperature section and low-temperature section of the annular cooler are completely sealed and isolated, so that the high-temperature flue gas in the high-temperature section of the annular cooler will not move to the low-temperature section area of ​​the annular cooler with the movement of the trolley 13, ensuring that the high-temperature flue gas in the high-temperature section area of ​​the annular cooler can be completely absorbed and utilized by the waste heat boiler 21. Furthermore, since the power source for the formation of the air curtain is the circulating fan 23, and the gas comes from the diversion of flue gas in the circulating pipe 22, no additional power source or additional gas is required. Moreover, the air curtain can be formed when the circulating fan 23 is started and disappear when the circulating fan 23 is turned off, without the need to set up an additional structure to control its formation or disappearance, which is low in cost and energy-saving and environmentally friendly.

[0026] It should be noted that the trolley 13 is rotatably connected to the top of the lower air duct 12, specifically meaning that the trolley 13 travels on the track at the top of the lower air duct 12. The connection relationship between the upper fume hood 11, the trolley 13, and the track at the top of the lower air duct 12 in the annular cooler is existing technology and is well known to those skilled in the art, so it will not be described in detail here. The high-temperature flue gas recovery port 111 and the blowpipe 25 are arranged sequentially along the direction of rotation of the trolley 13.

[0027] Optionally, the blowpipe 25 extends along the width direction of the upper fume hood 11, the length of the blowpipe 25 is equal to the width of the upper fume hood 11, and the bottom of the blowpipe 25 is provided with a blowpipe opening extending along its length direction (not shown in the figure).

[0028] In this embodiment, the length of the blowpipe 25 is equal to the width of the upper fume hood 11, so that the length of the final air curtain can completely seal and isolate the upper fume hood 11. The blowpipe 25 sprays smoke from the bottom nozzle to form the air curtain.

[0029] It should be noted that the upper smoke hood 11 is an annular hood, and the width of the upper smoke hood 11 refers to the distance between the two walls of the annular hood in the radial direction.

[0030] Optionally, the design flue gas volume of the circulating fan 23 is 280,000 Nm³. 3 / h, the diameter of the circulation pipe 22 is DN2400, the diameter of the branch pipe 24 is DN100, the diameter of the blow pipe 25 is less than or equal to the diameter of the branch pipe 24, the length of the blow pipe 25 is 3600mm, and the width of the blow nozzle is 3mm.

[0031] In this embodiment, the design flue gas volume of the circulating fan 23 is known to be 280,000 Nm³. 3 When the diameter of the outlet duct of the circulating fan 23 is DN2400, the flue gas velocity at the outlet duct of the circulating fan 23 is V=Q / 3600 / (πD) 2 / 4)=280000 / 3600 / (π*2.4 2 / 4)=17.2m / s, where Q represents the design flue gas volume of the circulating fan 23, and D represents the diameter of the outlet pipe of the circulating fan 23, which is the diameter of the circulating pipe 22. Then, given that the diameter of the branch pipe 24 is DN100, the flue gas volume Q1 delivered to the blowpipe 25 through the branch pipe 24 is Q1=V*(πD1) 2 / 4)=17.2*(π*0.12 / 4)=0.135m 3 / s, where D1 represents the diameter of branch pipe 24. Then, given that the length of the nozzle is 3600mm and the width is 3mm, the blowing velocity of the nozzle can be calculated as V1 = Q1 / (LB) = 0.135 / (3.6*0.003) = 12.5m / s, where L represents the length of the nozzle and B represents the width of the nozzle. The downward-blowing air curtain formed by the blowing velocity of 12.5m / s is perfectly adequate for isolating and sealing high-temperature flue gas.

[0032] In this embodiment, by designing the diameter of the injection pipe 25 to be smaller than the diameter of the branch pipe 24, it is ensured that the flow rate of flue gas diverted to the branch pipe 24 will not slow down due to a sudden increase in volume after entering the injection pipe 25. The diameter of the injection pipe 25 can be DN50. Moreover, since the diameter of the branch pipe 24 is much smaller than the diameter of the circulation pipe 22, the amount of flue gas diverted to the branch pipe 24 is negligible compared to the amount of flue gas sent into the lower air duct 12, and will not affect the cooling effect of the low-temperature flue gas (high-temperature flue gas after heat exchange in the waste heat boiler) on the ore in the circulation pipe 22.

[0033] See Figure 2 Optionally, the flue gas sealing device for the annular cooler further includes a slide rail 28, a metal hose 26, and a moving device. The slide rail 28 is disposed on the inner side of the upper fume hood 11, and the length direction of the slide rail 28 extends along the movement direction of the trolley 13. The blow pipe 25 is slidably connected to the slide rail 28, and the blow pipe 25 is connected to the branch pipe 24 through the metal hose 26.

[0034] During sintering ironmaking operations, according to relevant industry standards, a production mode typically employs two sintering machines (e.g., each a 430m² sintering machine) corresponding to two blast furnaces (e.g., each a 2500m³ blast furnace). Normally, each sintering machine operates at approximately 50% capacity, with both machines working together to achieve 100% capacity. When one sintering machine is under maintenance, the other operates at full capacity. As the sintering machine's production load changes, the area and temperature of the high-temperature flue gas in the corresponding annular cooler also change. Actual measurements show that when the sintering machine is operating at full capacity, the area of ​​the high-temperature flue gas (temperature greater than or equal to 280℃) increases by approximately 1.5m to 2m. To adapt to this change, in this embodiment, a slide rail of about 2m is installed inside the upper smoke hood 11 of the transition section between the high-temperature section and the low-temperature section of the flue gas. The blow pipe 25 is slidably connected to the slide rail 28. The blow pipe 25 is connected to the branch pipe 24 through the metal flexible hose 26 located inside the upper smoke hood 11. In this way, the position of the blow pipe can be adjusted according to the actual temperature value of the flue gas in the transition section, which can maximize the recovery of waste heat from the high-temperature flue gas.

[0035] In this embodiment, the moving device can be electrically connected to the control system of the annular cooler or the control system of the flue gas sealing device for the annular cooler, and then the moving device can be controlled by the control system to drive the blowpipe 25 to move.

[0036] The diameter of the metal hose 26 can be the same as the diameter of the blowpipe 25, both being DN50.

[0037] Optionally, a sealing structure (not shown in the figure) is provided between the blow pipe 25 and the inner wall of the top of the upper fume hood 11.

[0038] In this embodiment, by providing a sealing structure between the blow pipe 25 and the inner wall of the top of the upper fume hood 11, it can be ensured that the blow pipe 25 is always sealed with the inner wall of the upper fume hood 11 during the movement process, preventing high-temperature flue gas from leaking from these locations to the low-temperature section of the annular cooler.

[0039] Optionally, along the length of the slide rail 28, the inner wall of the upper fume hood 11 is provided with multiple temperature detection devices (not shown in the figure).

[0040] In this embodiment, each temperature detection device can be electrically connected to the control system. These devices can detect the temperature near the junction of the high-temperature and low-temperature sections of the annular cooler. For example, a thermocouple is installed every 300 mm. The thermocouples detect the flue gas temperature at each location and transmit the data to the control system. The control system then controls the movement of the blowpipe 25 in real time based on the measured flue gas temperature to maximize the recovery of high-temperature flue gas. For instance, when the sintering machine's production load increases, if a specific thermocouple detects a flue gas position of 280°, the control system will activate the moving device, moving the blowpipe 25 to the position corresponding to that thermocouple.

[0041] Calculations show that this embodiment, through the aforementioned "movable air curtain" isolation measures, not only completely eliminates the problem of high-temperature flue gas leakage but also increases the high-temperature flue gas recovery rate by approximately 5%-6%. When the sintering machine is operating at full capacity, the increased production load leads to a greater volume of high-temperature flue gas generated by the annular cooler. The flue gas temperature in the high-temperature section also increases from the design value of 280℃ to approximately 420℃, and the flue gas area in the high-temperature section also expands accordingly. To fully recover the waste heat from the flue gas, the control system moves the blowpipe 25 along the slide rail 28 towards the low-temperature section. The "movable air curtain" can increase the high-temperature flue gas recovery rate by approximately 30-35%. Furthermore, considering the increase in flue gas temperature from 280℃ to 420℃, the moving air curtain... The waste heat recovery of a sintering machine at full load is about 70% to 80% higher than that during conventional production. A single sintering machine operates at full load for about 600 to 800 hours per year, which is about 8% of the conventional production time. Preliminary calculations show that the heat recovery can be increased by 5% to 6% by using a mobile air curtain. After comprehensive analysis and calculation, the annual high-temperature flue gas volume can be increased by at least 10% by adopting the "mobile air curtain" isolation and sealing measures, resulting in significant economic and social benefits.

[0042] Optionally, the moving device includes a hydraulic cylinder (not shown in the figure), the cylinder body of which is fixed to the inner wall of the upper fume hood 11, and the piston rod of which is connected to the blowpipe 25.

[0043] In one embodiment, the moving device includes a hydraulic cylinder, which can be located inside the upper fume hood 11 and near the low-temperature section. The control system can move the blowpipe 25 by controlling the hydraulic cylinder.

[0044] See Figure 2 Optionally, the moving device includes a motor 271, a drum 272, a first wire rope 273, and a second wire rope 274. The top wall of the upper smoke hood 11 has a first rope hole and a second rope hole at both ends of the slide rail 28. The motor 271 is positioned on the outer side of the top wall of the upper smoke hood 11 between the first rope hole and the second rope hole. The motor 271 is coaxially connected to the drum 272. One end of the first wire rope 273 is connected to the drum 272. The other end of the first wire rope 273 passes through the first rope hole and is connected to one side of the blow pipe 25. One end of the second wire rope 274 is connected to the drum 272, and the other end of the second wire rope 274 passes through the second rope hole and is connected to the other side of the blow pipe 25. When the motor 271 rotates, one of the first wire rope 273 and the second wire rope 274 is wound by the drum 272, and the other of the first wire rope 273 and the second wire rope 274 is released by the drum 272.

[0045] In another embodiment, the power source for moving the blowpipe 25 is a motor 271. The motor 271 is arranged on the outer side of the top wall of the upper fume hood 11 to ensure that the high-temperature flue gas inside the upper fume hood 11 will not damage the motor 271. The motor 271 drives a roller 272. The roller 272 is connected to the blowpipe 25 through a first steel wire rope 273 and a second steel wire rope 274. When the motor 271 drives the roller 272 to rotate counterclockwise, the first steel wire rope 273 is gradually released, while the second steel wire rope 274 is gradually wound up, thereby realizing the movement of the blowpipe 25 in the direction of the trolley 13, that is, moving towards the low-temperature section and expanding the area of ​​flue gas recovery. When the motor 271 drives the roller 272 to rotate clockwise, the second steel wire rope 274 is gradually released, while the first steel wire rope 273 is gradually wound up, realizing the movement of the blowpipe 25 towards the high-temperature section, that is, moving towards the discharge port 112 and reducing the area of ​​flue gas recovery. Optionally, the inner wall of the first rope hole may be provided with a sealing structure to ensure that the first wire rope 273 is always sealed with the first rope hole when it moves in the first rope hole, so as to prevent high-temperature flue gas from leaking out from here.

[0046] See Figure 2Optionally, the moving device further includes a first fixed pulley 275, a second fixed pulley 276, a third fixed pulley 277, and a fourth fixed pulley 278. The first fixed pulley 275 and the second fixed pulley 276 are respectively disposed on the inner and outer sides of the top wall of the upper smoke hood 11, and both the first fixed pulley 275 and the second fixed pulley 276 are close to the first rope hole. The third fixed pulley 277 and the fourth fixed pulley 278 are respectively disposed on the inner and outer sides of the top wall of the upper smoke hood 11, and both the third fixed pulley 277 and the fourth fixed pulley 278 are close to the second rope hole. The first wire rope 273 cooperates with the first fixed pulley 275 and the second fixed pulley 276 respectively, and the second wire rope 274 cooperates with the third fixed pulley 277 and the fourth fixed pulley 278 respectively.

[0047] In this embodiment, the first fixed pulley 275 and the second fixed pulley 276 can guide the movement of the first wire rope 273 and also prevent the first wire rope 273 from wearing out. The third fixed pulley 277 and the fourth fixed pulley 278 can guide the movement of the second wire rope 274 and also prevent the second wire rope 274 from wearing out.

[0048] Optionally, the flue gas sealing device for the annular cooler also includes a steel cable (not shown in the figure), the two ends of which are respectively connected to the inner side of the top wall of the upper fume hood 11, and the metal hose 26 is provided with a plurality of connecting rings (not shown in the figure) along its length, and the plurality of connecting rings are respectively fitted onto the steel cable.

[0049] In this embodiment, the metal hose 26 is connected to the steel cable via multiple connecting rings, ensuring that the metal hose 26 remains close to the top wall of the upper fume hood 11 when retracted, preventing its middle section from falling onto the ore when fully retracted. The movement of the metal hose 26 relative to the steel cable is analogous to the movement of a "curtain," which will not be described in detail here.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include at least one of those features.

[0051] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A flue gas sealing device for an annular cooler, the annular cooler comprising an upper fume hood (11), a lower air duct (12), and a trolley (13), the trolley (13) being rotatably connected to the top of the lower air duct (12), the upper fume hood (11) being fixedly and sealingly connected to the top of the lower air duct (12), and the upper fume hood (11) covering the trolley (13), the annular cooler also being equipped with an annular cooler waste heat recovery system, the annular cooler waste heat recovery system comprising a waste heat boiler (21), a circulating pipe (22), and a circulating fan (23), characterized in that, The flue gas sealing device for the annular cooler includes a branch pipe (24) and a jet pipe (25). The inlet of the waste heat boiler (21) is connected to the high-temperature flue gas recovery port (111) of the upper fume hood (11). The outlet of the waste heat boiler (21) is connected to one end of the circulation pipe (22). The other end of the circulation pipe (22) is connected to the lower air duct (12). The circulation fan (23) is installed on the circulation pipe (22). One end of the branch pipe (24) is connected to the circulation pipe (22) and located on the side of the air outlet of the circulation fan (23). The other end of the branch pipe (24) is connected to the jet pipe (25). The jet pipe (25) is installed on the inner side of the top wall of the upper fume hood (11). The jet pipe (25) is used to spray to form an air curtain to isolate the high-temperature section and the low-temperature section of the annular cooler.

2. The flue gas sealing device for an annular cooler according to claim 1, characterized in that, The blowpipe (25) extends along the width direction of the upper fume hood (11) and the length of the blowpipe (25) is equal to the width of the upper fume hood (11). The bottom of the blowpipe (25) has a blowpipe opening that extends along its length direction.

3. The flue gas sealing device for an annular cooler according to claim 2, characterized in that, The design flue gas volume of the circulating fan (23) is 280,000 Nm³. 3 / h, the diameter of the circulation pipe (22) is DN2400, the diameter of the branch pipe (24) is DN100, the diameter of the blow pipe (25) is less than or equal to the diameter of the branch pipe (24), the length of the blow pipe (25) is 3600mm, and the width of the blow nozzle is 3mm.

4. The flue gas sealing device for an annular cooler according to claim 1, characterized in that, It also includes a slide rail (28), a metal hose (26) and a moving device. The slide rail (28) is located inside the upper fume hood (11). The length of the slide rail (28) extends along the movement direction of the trolley (13). The blow pipe (25) is slidably connected to the slide rail (28). The blow pipe (25) is connected to the branch pipe (24) through the metal hose (26). The moving device is used to drive the blow pipe (25) to move along the slide rail (28).

5. The flue gas sealing device for an annular cooler according to claim 4, characterized in that, A sealing structure is provided between the blow pipe (25) and the top inner wall of the upper fume hood (11).

6. The flue gas sealing device for an annular cooler according to claim 4, characterized in that, Along the length of the slide rail (28), the inner wall of the upper fume hood (11) is provided with multiple temperature detection devices.

7. The flue gas sealing device for an annular cooler according to claim 4, characterized in that, The moving mechanism includes a hydraulic cylinder, the cylinder body of which is fixed to the inner wall of the upper fume hood (11), and the piston rod of which is connected to the blow pipe (25).

8. The flue gas sealing device for an annular cooler according to claim 4, characterized in that, The moving device includes a motor (271), a drum (272), a first wire rope (273), and a second wire rope (274). The top wall of the upper smoke hood (11) has a first rope hole and a second rope hole at both ends of the slide rail (28). The motor (271) is positioned on the outer side of the top wall of the upper smoke hood (11) between the first rope hole and the second rope hole. The motor (271) is coaxially connected to the drum (272). One end of the first wire rope (273) is connected to the drum (272). The first wire rope (274)... The other end passes through the first rope hole and is connected to one side of the blow pipe (25). One end of the second wire rope (274) is connected to the drum (272), and the other end of the second wire rope (274) passes through the second rope hole and is connected to the other side of the blow pipe (25). When the motor (271) rotates, one of the first wire rope (273) and the second wire rope (274) is wound by the drum (272), and the other of the first wire rope (273) and the second wire rope (274) is released by the drum (272).

9. The flue gas sealing device for an annular cooler according to claim 8, characterized in that, The moving device further includes a first fixed pulley (275), a second fixed pulley (276), a third fixed pulley (277), and a fourth fixed pulley (278). The first fixed pulley (275) and the second fixed pulley (276) are respectively disposed on the inner and outer sides of the top wall of the upper smoke hood (11), and the first fixed pulley (275) and the second fixed pulley (276) are both close to the first rope hole. The third fixed pulley (277) and the fourth fixed pulley (278) are respectively disposed on the inner and outer sides of the top wall of the upper smoke hood (11), and the third fixed pulley (277) and the fourth fixed pulley (278) are both close to the second rope hole. The first wire rope (273) cooperates with the first fixed pulley (275) and the second fixed pulley (276) respectively, and the second wire rope (274) cooperates with the third fixed pulley (277) and the fourth fixed pulley (278) respectively.

10. The flue gas sealing device for an annular cooler according to claim 4, characterized in that, It also includes a steel cable, the two ends of which are respectively connected to the inner side of the top wall of the upper smoke hood (11), and the metal hose (26) is provided with multiple connecting rings along its length, and the multiple connecting rings are respectively sleeved on the steel cable.

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