Blast furnace hot blast stove preheating device

Abstract

The application discloses a blast furnace hot blast stove preheating device, and relates to the technical field of hot blast stoves.The preheating device comprises a preheating cylinder and a preheating air inlet pipe assembly.The preheating air inlet pipe assembly comprises a heat exchange guide air pipe and two outer extension pipes, one of the outer extension pipes is connected with an air inlet system, and the other outer extension pipe is connected with an air inlet of the hot blast stove.The preheating device further comprises a cleaning component arranged in the preheating cylinder, and the cleaning component radially passes through a gap of the heat exchange guide air pipe.The rotating heat exchange guide air pipe can drive the cleaning component to move along an axis of the preheating cylinder.The preheating device has a simple structure, the fresh air is preheated by the heat exchange pipe with a spiral structure, the preheating effect is improved, the cleaning component is moved and the dust and dirt adhered to the outer wall of the heat exchange guide air pipe and the inner wall of the preheating cylinder is cleaned by rotating the heat exchange pipe with the spiral structure, and the heat exchange effect is not affected by too much dust and dirt.

Description

Technical Field

[0001] This invention relates to the field of hot blast stove technology, specifically a preheating device for a blast furnace hot blast stove. Background Technology

[0002] Hot blast stoves are one of the main supporting equipment for blast furnaces in ironmaking plants. Their function is to heat the blast air to the required temperature to improve the efficiency and effectiveness of the blast furnace. Hot blast stove preheating devices utilize the flue gas in the boiler's tail flue and heat exchange to preheat the air entering the boiler to a certain temperature, thereby improving the boiler's heat exchange performance and reducing energy consumption.

[0003] Conventional hot air furnace preheating devices involve passing the fresh air intake duct through the exhaust duct that discharges waste air. The intake duct, located inside the exhaust duct, can conduct heat, allowing the heat in the waste air to exchange with the fresh air, thus preheating the fresh air. However, the waste air carries dust particles, some of which adhere to the inner wall of the exhaust duct and the outer wall of the intake duct. The outer wall of the intake duct can affect the heat conduction of the intake duct to some extent, thereby affecting the preheating effect of the fresh air. Summary of the Invention

[0004] The purpose of this invention is to provide a preheating device for a blast furnace hot blast stove to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A preheating device for a blast furnace hot blast stove includes a preheating cylinder and a preheating inlet pipe assembly. An inlet is provided on one end face of the preheating cylinder and is connected to the exhaust system of the hot blast stove. An exhaust port communicating with the interior of the preheating cylinder is located on its outer wall. The preheating inlet pipe assembly includes a heat exchange guide pipe and two external extension pipes. The heat exchange guide pipe has a spiral structure, and the two external extension pipes are respectively located at both ends of the heat exchange guide pipe. The two external extension pipes pass through both ends of the preheating cylinder and are rotatably connected to the ends of the preheating cylinder. One external extension pipe is connected to the air intake system, and the other external extension pipe is connected to the air intake system of the hot blast stove. The preheating cylinder is connected to an air outlet and has a power component on one end face. The power component is connected to an outer extension pipe and can drive the outer extension pipe to rotate in both directions. It also includes a cleaning component inside the preheating cylinder. The cleaning component is axially slidably connected to the inner wall of the preheating cylinder and passes radially through the gap of the heat exchange air pipe. The rotating heat exchange air pipe can drive the cleaning component to move along the axis of the preheating cylinder. The moving cleaning component can scrape off the dirt on the inner wall of the preheating cylinder and the outer wall of the heat exchange air pipe. The arc bottom of the preheating cylinder is provided with at least one slag discharge port, which is located on the outer wall of the preheating cylinder near the end.

[0007] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In one alternative embodiment: the cleaning component includes a radial rod shaft, a scraping ring body, and a brush portion. The outer wall of the scraping ring body is close to the inner wall of the preheating cylinder, and the scraping ring body is slidably connected to the inner wall of the preheating cylinder. The radial rod shaft passes radially through the gap of the heat exchange air pipe, and both ends of the radial rod shaft are fixedly connected to the scraping ring body. A sleeve is fitted on the outer wall of the scraping ring body, and the brush portion is distributed on the outer wall of the sleeve.

[0009] In one alternative: the sleeve is rotatably connected to the radial rod shaft and a rotating gear is provided on the sleeve; the cleaning component further includes a guide rack, the two ends of which are respectively connected to the inner wall of the preheating cylinder through fixed seats; the length direction of the guide rack is parallel to the axis of the preheating cylinder and the guide rack meshes with the rotating gear.

[0010] In one alternative: the power component includes a power motor and a driven gear. The power motor is located on the end face of the preheating cylinder and a power gear is provided on the output end of the power motor. The driven gear is located on the outer extension tube and meshes with the power gear.

[0011] In one alternative: reversing switches are also provided on the side walls of the two fixed seats, and both reversing switches are positioned opposite to the scraping ring body. Both reversing switches are electrically connected to the power component. When the scraping ring body moves to one end of the preheating cylinder, the scraping ring body contacts one of the reversing switches, and the reversing switch sends a sensing signal to the power component, which drives the outer extension tube to rotate in the opposite direction.

[0012] In one alternative: the preheating cylinder includes an outer cylinder and an inner cylinder, with an insulating cavity between the outer cylinder and the inner cylinder that encloses the inner cylinder. The inner cylinder has a vent hole on its side wall that communicates with the insulating cavity. The air inlet is connected to the inner cylinder, and the exhaust outlet is located on the side wall of the outer cylinder and is connected to the insulating cavity.

[0013] In one alternative: the vent is opposite to the slag discharge port and is located at the apex of the inner cylinder, and the vent and exhaust port are located at the two ends of the heat insulation cavity, respectively.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In this invention, the waste gas flow inside the preheating cylinder carries a large amount of heat, and then the waste gas flow exchanges heat with the fresh air through the heat exchange duct, thereby preheating the fresh air; since the heat exchange duct has a spiral structure, the path of the fresh air is increased, so that the fresh air stays inside the preheating cylinder for a relatively long time, thus improving the preheating effect.

[0016] 2. In this invention, the power component drives the spiral structure of the heat exchange air tube to rotate. The rotating heat exchange air tube drives the cleaning component to move along the axis of the preheating cylinder. The moving cleaning component scrapes off the dirt and grime adhering to the outer wall of the heat exchange air tube and the inner wall of the preheating cylinder.

[0017] 3. The present invention has a simple structure. It uses a spiral heat exchange tube to preheat fresh air, thereby improving the preheating effect. By driving the spiral heat exchange tube to rotate, the cleaning component moves and cleans the dust and dirt adhering to the outer wall of the heat exchange air duct and the inner wall of the preheating cylinder, thus avoiding excessive dust and dirt from affecting the heat exchange effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the preheating device in one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the preheating cylinder in one embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the preheating air intake pipe assembly structure in one embodiment of the present invention.

[0021] Figure 4 for Figure 1 Enlarged structural diagram at point A0.

[0022] Figure 5 This is a schematic diagram of the cleaning component structure in one embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the fabric structure of the bristles in one embodiment of the present invention.

[0024] Figure reference numerals: Preheating cylinder 100, air inlet 120, exhaust port 130, preheating air inlet pipe assembly 200, heat exchange air guide pipe 210, outer extension pipe 220, rotary connector 230, driven gear 240, outer cylinder 300, inner cylinder 400, vent hole 410, heat insulation cavity 420, cleaning component 500, radial rod 510, scraping ring 520, sleeve component 530, brush part 540, rotating gear 550, guide rack 560, fixed seat 570, reversing switch 580, slag discharge port 600, power motor 700, power gear 710. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the drawings or description, similar or identical parts are referred to by the same reference numerals, and in practical applications, the shape, thickness, or height of each component may be enlarged or reduced. The embodiments listed in this invention are merely illustrative and not intended to limit the scope of the invention. Any obvious modifications or changes made to this invention do not depart from the spirit and scope of the invention.

[0026] In one embodiment, such as Figures 1-4 As shown, a preheating device for a blast furnace hot blast stove includes a preheating cylinder 100 and a preheating inlet pipe assembly 200. An inlet 120 is provided on one end face of the preheating cylinder 100 and is connected to the exhaust device of the hot blast stove. An exhaust port 130 communicating with the interior of the preheating cylinder 100 is located on its outer wall. The preheating inlet pipe assembly 200 includes a heat exchange guide pipe 210 and two external extension pipes 220. The heat exchange guide pipe 210 has a spiral structure, and the two external extension pipes 220 are respectively located at both ends of the heat exchange guide pipe 210. The two external extension pipes 220 pass through both ends of the preheating cylinder 100 and are rotatably connected to the ends of the preheating cylinder 100. One external extension pipe 220 is connected to the air intake system, and the other external extension pipe 220 is connected to the hot blast stove's exhaust system. The preheating cylinder 100 is connected to an air inlet and has a power component on one end face. The power component is connected to the outer extension pipe 220 and can drive the outer extension pipe 220 to rotate in both directions. It also includes a cleaning component 500 inside the preheating cylinder 100. The cleaning component 500 is axially slidably connected to the inner wall of the preheating cylinder 100 and radially passes through the gap of the heat exchange air pipe 210. The rotating heat exchange air pipe 210 can drive the cleaning component 500 to move along the axis of the preheating cylinder 100. The moving cleaning component 500 can scrape off the dirt on the inner wall of the preheating cylinder 100 and the outer wall of the heat exchange air pipe 210. The preheating cylinder 100 has at least one slag discharge port 600 at the bottom of its arc and the slag discharge port 600 is located near the end of the outer wall of the preheating cylinder 100.

[0027] In this embodiment of the invention, the waste gas flow in the blast furnace hot blast stove is introduced into the air inlet 120 through the exhaust device, and then into the preheating cylinder 100 through the air inlet 120. The waste gas flow in the preheating cylinder 100 is finally discharged through the exhaust port 130. The external air intake system introduces fresh air into the preheating air intake pipe assembly 200. The fresh air flows inside the heat exchange air guide pipe 210, and the heat exchange air guide pipe 210 is completely inside the preheating cylinder 100. The waste gas flow in the preheating cylinder 100 carries a large amount of heat, and then the waste gas flow exchanges heat with the fresh air through the heat exchange air guide pipe 210. This allows for the preheating of fresh air. Because the heat exchange duct 210 has a spiral structure, it increases the path of the fresh air, allowing it to remain inside the preheating cylinder 100 for a relatively longer time, thus improving the preheating effect. Simultaneously, the power unit drives the outer extension pipe 220 to rotate, causing the heat exchange duct 210 to rotate. The rotating heat exchange duct 210 drives the cleaning component 500 to move along the axis of the preheating cylinder 100. The moving cleaning component 500 scrapes away the dirt adhering to the outer wall of the heat exchange duct 210 and the inner wall of the preheating cylinder 100. The dirt is finally discharged through the slag discharge port 600.

[0028] In one embodiment, such as Figures 1-6 As shown, the cleaning component 500 includes a radial shaft 510, a scraping ring 520, and a brush portion 540. The outer wall of the scraping ring 520 is tightly attached to the inner wall of the preheating cylinder 100, and the scraping ring 520 is slidably connected to the inner wall of the preheating cylinder 100. The radial shaft 510 radially passes through the gap of the heat exchange air pipe 210, and both ends of the radial shaft 510 are fixedly connected to the scraping ring 520. A sleeve 530 is fitted on the outer wall of the scraping ring 520, and the brush portion 540 is distributed on the outer wall of the sleeve 530. In this invention... In this embodiment, because the heat exchange air pipe 210 has a spiral structure, the rotating heat exchange air pipe 210 can drive the radial rod shaft 510 to move along the axis of the preheating cylinder 100. The brush part 540 contacts the outer wall of the heat exchange air pipe 210 and moves relative to it. The moving brush part 540 can scrape off the dirt adhering to the outer wall of the heat exchange air pipe 210. The scraping ring 520 moves with the radial rod shaft 510 and can scrape off the dirt on the inner wall of the preheating cylinder 100. The dirt is finally discharged from the slag discharge port 600.

[0029] In one embodiment, such as Figures 1-6As shown, the sleeve 530 is rotatably connected to the radial shaft 510 and a rotating gear 550 is provided on the sleeve 530. The cleaning component 500 also includes a guide rack 560. The two ends of the guide rack 560 are respectively connected to the inner wall of the preheating cylinder 100 through the fixing seat 570. The length direction of the guide rack 560 is parallel to the axis of the preheating cylinder 100 and the guide rack 560 meshes with the rotating gear 550. In this embodiment of the invention, when the sleeve 530 moves along the axis of the preheating cylinder 100 with the radial shaft 510, under the meshing action of the guide rack 560 and the rotating gear 550, the sleeve 530 rotates and drives the brush part 540 to rotate, thereby the brush part 540 can effectively clean the dirt on the outer wall of the heat exchange air pipe 210.

[0030] In one embodiment, such as Figures 1-4 As shown, the power component includes a power motor 700 and a driven gear 240. The power motor 700 is located on the end face of the preheating cylinder 100, and a power gear 710 is provided on the output end of the power motor 700. The driven gear 240 is located on the outer extension tube 220, and the driven gear 240 meshes with the power gear 710. In this embodiment of the invention, the power motor 700 is a servo motor, and its output end can rotate in both directions. The power motor 700 drives the outer extension tube 220 to rotate through the meshing of the power gear 710 and the driven gear 240. The end of the outer extension tube 220 is provided with a rotating connector 230 connected to the air guide tube. The rotating connector 230 is rotatably connected to the outer extension tube 220, so that when the outer extension tube 220 rotates, the outer extension tube 220 will not drive the external air tube to rotate.

[0031] In one embodiment, such as Figures 2-5 As shown, two reversing switches 580 are also provided on the side walls of the two fixed seats 570, and both reversing switches 580 are arranged opposite to the scraping ring body 520. Both reversing switches 580 are electrically connected to the power component. When the scraping ring body 520 moves to one end of the preheating cylinder 100, the scraping ring body 520 contacts one of the reversing switches 580. The reversing switch 580 sends a sensing signal to the power component, and the power component drives the outer extension tube 220 to rotate in the opposite direction, thereby enabling the cleaning component 500 to move reciprocally, effectively cleaning the dust and dirt on the heat exchange air pipe 210 and the inner wall of the preheating cylinder 100.

[0032] In one embodiment, such as Figures 1-3As shown, the preheating cylinder 100 includes an outer cylinder 300 and an inner cylinder 400. A heat insulation cavity 420 enclosing the inner cylinder 400 is provided between the outer cylinder 300 and the inner cylinder 400. A vent hole 410 communicating with the heat insulation cavity 420 is provided on the side wall of the inner cylinder 400. An air inlet 120 is connected to the inner cylinder 400, and an exhaust outlet 130 is located on the side wall of the outer cylinder 300 and communicates with the heat insulation cavity 420. In this embodiment of the invention, the blast furnace... The waste gas flow in the hot blast furnace enters the inner cylinder 400 through the air inlet 120. Inside the inner cylinder 400, the waste gas flow exchanges heat with the fresh air in the heat exchange duct 210. Then, the waste gas flow enters the insulation cavity 420 through the vent 410. The waste gas flow fills the insulation cavity 420 and is finally discharged through the exhaust port 130. The waste gas flow in the insulation cavity 420 forms a protective layer on the outside of the inner cylinder 400, effectively preventing the heat inside the inner cylinder 400 from being lost through the outer wall of the preheating cylinder 100.

[0033] In one embodiment, such as Figure 1 and Figure 2 As shown, the vent 410 is opposite to the slag discharge port 600 and is located at the apex of the inner cylinder 400. The vent 410 and the exhaust port 130 are located at the two ends of the heat insulation cavity 420, respectively. In this embodiment of the invention, the vent 410 located at the apex of the inner cylinder 400 prevents dirt inside the inner cylinder 400 from entering the heat insulation cavity 420 through the vent 410. Because the vent 410 and the exhaust port 130 are located at the two ends of the heat insulation cavity 420, the waste gas flow entering the heat insulation cavity 420 through the vent 410 can fill the interior of the heat insulation cavity 420 before being discharged through the exhaust port 130.

[0034] The above embodiment provides a blast furnace hot blast stove preheating device, wherein an external air intake system introduces fresh air into the preheating air intake pipe assembly 200. The fresh air flows inside the heat exchange air guide pipe 210, which is completely inside the preheating cylinder 100. The waste gas flow inside the preheating cylinder 100 carries a large amount of heat, and then the waste gas flow exchanges heat with the fresh air through the heat exchange air guide pipe 210, thereby preheating the fresh air. Since the heat exchange air guide pipe 210 has a spiral structure, it increases the efficiency of heat exchange. The fresh air path allows the fresh air to stay inside the preheating cylinder 100 for a relatively long time, improving the preheating effect. At the same time, the power component drives the outer extension pipe 220 to rotate, which in turn causes the heat exchange air duct 210 to rotate. The rotating heat exchange air duct 210 drives the cleaning component 500 to move along the axis of the preheating cylinder 100. The moving cleaning component 500 scrapes off the dirt and grime adhering to the outer wall of the heat exchange air duct 210 and the inner wall of the preheating cylinder 100. The dirt and grime are finally discharged from the slag discharge port 600.

[0035] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A preheating device for a blast furnace hot blast stove, comprising a preheating cylinder and a preheating inlet pipe assembly, wherein an inlet is provided on one end face of the preheating cylinder and the inlet is used to connect to the exhaust device of the hot blast stove, and an exhaust port communicating with the interior of the preheating cylinder is provided on its outer wall, characterized in that, The preheating air inlet pipe assembly includes a heat exchange air guide pipe and two external extension pipes; The heat exchange air duct has a spiral structure and two external extension tubes are respectively located at both ends of the heat exchange air duct. The two external extension tubes pass through both ends of the preheating cylinder and are rotatably connected to the ends of the preheating cylinder. One of the external extension pipes is connected to the air intake system and the other external extension pipe is connected to the air inlet of the hot blast stove. A power component is provided on one end face of the preheating cylinder. The power component is connected to the outer extension pipe and can drive the outer extension pipe to rotate in both directions. It also includes a cleaning component located inside the preheating cylinder, wherein the cleaning component is axially slidably connected to the inner wall of the preheating cylinder and radially passes through the gap of the heat exchange air pipe; The rotating heat exchange air pipe can drive the cleaning component to move along the axis of the preheating cylinder. The moving cleaning component can scrape off the dirt on the inner wall of the preheating cylinder and the outer wall of the heat exchange air pipe. The arc bottom of the preheating cylinder is provided with at least one slag discharge port, and the slag discharge port is located on the outer wall of the preheating cylinder near the end. The cleaning component includes a radial shaft, a scraping ring, and a brush section; The outer wall of the scraping ring is closely attached to the inner wall of the preheating cylinder, and the scraping ring is slidably connected to the inner wall of the preheating cylinder. The radial rod shaft passes radially through the gap of the heat exchange air pipe and both ends of the radial rod shaft are fixedly connected to the scraping ring body. A sleeve is fitted on the outer wall of the scraping ring body and the bristles are distributed on the outer wall of the sleeve. The sleeve is rotatably connected to the radial rod shaft and is provided with a rotating gear. The cleaning component also includes a guide rack, the two ends of which are connected to the inner wall of the preheating cylinder via fixed seats. The length direction of the guide rack is parallel to the axis of the preheating cylinder and the guide rack meshes with a rotating gear.

2. The blast furnace hot blast stove preheating device according to claim 1, characterized in that, The power component includes a power motor and a driven gear. The power motor is located on the end face of the preheating cylinder and a power gear is provided on the output end of the power motor. The driven gear is located on the outer extension tube and meshes with the power gear.

3. The blast furnace hot blast stove preheating device according to claim 2, characterized in that, Two reversing switches are also provided on the side walls of the two fixed seats, and both reversing switches are positioned opposite to the scraping ring body. Both reversing switches are electrically connected to the power component. When the scraping ring body moves to one end of the preheating cylinder, the scraping ring body contacts one of the reversing switches, and the reversing switch sends a sensing signal to the power component, which drives the outer extension tube to rotate in the opposite direction.

4. The blast furnace hot blast stove preheating device according to claim 1, characterized in that, The preheating cylinder includes an outer cylinder and an inner cylinder. There is a heat insulation cavity between the outer cylinder and the inner cylinder that encloses the inner cylinder. A vent hole connected to the heat insulation cavity is opened on the side wall of the inner cylinder. The air inlet is connected to the inner cylinder, and the exhaust port is located on the side wall of the outer cylinder and is connected to the heat insulation cavity.

5. The blast furnace hot blast stove preheating device according to claim 4, characterized in that, The vent hole is opposite to the slag discharge port and is located at the arc apex of the inner cylinder. The vent hole and the exhaust port are located at the two ends of the heat insulation cavity, respectively.

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