A high-efficiency injection device for metallurgical furnaces and kilns

Abstract

This invention discloses a high-efficiency injection device for metallurgical furnaces, applied in the field of blast furnace injection technology. The invention uses branched raw material pipes to transport pulverized coal and dry-quenched coke powder into a mixing pipe for mixing. A rotating bucket drives the pulverized coal and dry-quenched coke powder to rotate. Guide plates block and guide the pulverized coal and dry-quenched coke powder towards the lower port of the rotating bucket. The pulverized coal and dry-quenched coke powder pass through the lower port of the rotating bucket and enter the gap between the rotating grinding disc and the fixed disc. The rotating grinding disc and the fixed disc grind and mix the pulverized coal and dry-quenched coke powder, crushing any agglomerates. A descending extrusion plug further compresses the pulverized coal and dry-quenched coke powder within the rotating bucket, pushing them through the lower port of the rotating bucket. This effectively prevents the pulverized coal and dry-quenched coke powder from clogging the lower port of the rotating bucket, facilitating the blowing of the pulverized coal and dry-quenched coke powder into the blast furnace in the form of a powder spray, effectively improving the injection effect of the pulverized coal and dry-quenched coke powder.

Description

Technical Field

[0001] This invention relates to the field of blast furnace injection technology, and particularly to a high-efficiency injection device for metallurgical furnaces. Background Technology

[0002] Most blast furnaces employ pulverized coal injection (PCO). Dry-quenched coke powder is a white powder mainly composed of silicates and alumina. It serves as a high-quality furnace charge and is widely used in metallurgy, chemical industry, and other sectors. Blast furnace smelting utilizes either full coke production or a combination of coke and PCO. Research has shown that the mesh size of the dust from dry-quenched coke and the pulverized coal produced by pulverized coal injection mills in blast furnaces is essentially the same. Furthermore, according to physicochemical parameters provided by chemical plants, the calorific value of the dust from dry-quenched coke (coke powder) is even higher than that of pulverized coal. Adding dry-quenched coke powder to pulverized coal in a specific ratio can... To improve the calorific value of pulverized coal and realize the waste utilization of dry quenched coke powder, it is energy-saving and environmentally friendly. During the injection process, dry quenched coke powder and pulverized coal need to be mixed in proportion and then blown into the blast furnace equipment with hot air. For example, the dry quenched coke powder injection equipment for blast furnace disclosed in Chinese patent CN118726670A drives the uniform component to run by starting the rotating motor. Through the operation of the uniform component, the dry quenched coke powder and pulverized coal can be fed into the collecting pipe in proportion. The dry quenched coke powder and pulverized coal in the collecting pipe will fall down into the injection shell, and the gas blown in from the air inlet pipe will blow and mix the dry quenched coke powder and pulverized coal. In the process of dry quenching coke powder and coal powder injection, relying solely on hot air for mixing the dry quenching coke powder and coal powder is inefficient. A specific mixing structure is needed to improve the mixing effect of dry quenching coke powder and coal powder. For example, the blast furnace dry quenching coke powder injection equipment disclosed in Chinese patent CN108660271A uses a third motor to drive a stirring device to mix the coal powder and dry quenching coke powder in the Y-shaped tube. However, the falling dry quenching coke powder and coal powder are fast, especially the clump-forming dry quenching coke powder and coal powder fall even faster. The stirring device cannot keep up with the time to fully mix the coal powder and dry quenching coke powder, which affects the mixing effect of coal powder and dry quenching coke powder. Summary of the Invention

[0003] The core of this invention lies in grinding and mixing pulverized coal and dry-quenched coke powder using a rotating grinding disc and a fixed disc, thus solving the problem of insufficient mixing effect of pulverized coal and dry-quenched coke powder in the prior art.

[0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] A high-efficiency injection device for metallurgical furnaces includes an injection shell, an air inlet pipe and an outlet pipe fixedly connected to both ends of the injection shell, a mixing pipe fixedly connected to the top of the injection shell, a branch raw material pipe fixedly connected to the top of the mixing pipe, and a raw material bin fixedly connected to the top of the branch of the branch raw material pipe. A fixed plate is fixedly connected to the connection between the mixing pipe and the spray housing. A powder drop port is opened between the outer ring of the fixed plate and the inner wall of the mixing pipe. A rotating bucket is rotatably connected inside the mixing pipe. A rotating grinding disc is fixedly connected to the lower port of the rotating bucket. The lower surface of the rotating grinding disc is in rotatable contact with the upper surface of the fixed plate. A rotating pipe shaft is rotatably connected to the middle of the bottom end of the branch raw material pipe. A connecting frame is fixedly connected between the bottom end of the rotating pipe shaft and the top inner ring of the rotating bucket. A drive motor is fixedly connected to the back of the bottom end of the branch raw material pipe. The output end of the drive motor is connected to the top end of the rotating pipe shaft through belt drive.

[0006] Furthermore, the upper surface of the fixed disk is convex spherical, the lower surface of the rotating grinding disk is concave spherical, and grinding ends are uniformly fixedly connected to the lower surface of the rotating grinding disk.

[0007] Furthermore, a sealing ring is fitted around the outer ring of the rotating disc, and the sealing ring slides in contact with the inner wall of the mixing pipe.

[0008] Furthermore, a fixed shaft is fixedly connected to the middle of the rotating grinding disc. The fixed shaft passes through the lower port of the rotating bucket, and a guide plate is fixedly connected to the outside of the fixed shaft. The guide plate is curved in an arc shape and slides in contact with the inner wall of the rotating bucket.

[0009] Optionally, a fixing ring is fixedly connected to the connection between the branch raw material pipe and the mixing pipe. The inner diameter of the fixing ring is smaller than the inner diameter of the top end of the mixing pipe, and the bottom of the fixing ring is in rotatable contact with the top edge of the rotating bucket. The top of the inner ring of the fixing ring is set with an inclined surface.

[0010] Furthermore, a lifting shaft is sleeved in the middle of the rotating tube shaft, and a squeezing plug is rotatably connected to the bottom end of the lifting shaft. When the squeezing plug is in the descending state, the bottom of the squeezing plug extends into the interior of the rotating bucket, and the outer ring of the bottom of the squeezing plug contacts the top of the fixed ring.

[0011] Furthermore, the outer ring of the squeeze plug has a connecting hole, which is sleeved with the connecting bracket.

[0012] Furthermore, a lifting push rod is fixedly connected to the middle of the branch raw material pipe, and the output end of the lifting push rod is fixedly connected to the top end of the lifting shaft.

[0013] Compared with the prior art, the advantages of this invention are: (1) In this invention, coal powder and dry quenched coke powder are transported into the mixing pipe through the branch raw material pipe for mixing. The rotating bucket drives the coal powder and dry quenched coke powder to rotate. The guide plate blocks and guides the coal powder and dry quenched coke powder to move towards the lower port of the rotating bucket. The coal powder and dry quenched coke powder pass through the lower port of the rotating bucket and enter the gap between the rotating grinding disc and the fixed disc. The rotating grinding disc and the fixed disc grind and mix the coal powder and dry quenched coke powder, crushing the agglomerates of coal powder and dry quenched coke powder. This makes it easier for the coal powder and dry quenched coke powder to be blown into the blast furnace in the form of powder spray, effectively improving the spraying effect of coal powder and dry quenched coke powder.

[0014] (2) The present invention uses a lifting push rod to push the lifting shaft to realize the lifting movement of the squeezing plug. The squeezing plug descends to squeeze the coal powder and dry quenched coke powder in the rotating bucket, and further pushes the coal powder and dry quenched coke powder through the lower port of the rotating bucket, effectively preventing the coal powder and dry quenched coke powder from blocking the lower port of the rotating bucket. When the blowing device is in the case of stopping blowing powder and only blowing air, the descending squeezing plug makes contact with the top of the fixed ring, so that the squeezing plug seals the top of the mixing pipe, cuts off the connection between the mixing pipe and the branch raw material pipe, effectively prevents gas leakage in the mixing pipe, and thus effectively improves the safety effect of the blowing device. Attached Figure Description

[0015] Figure 1 This is a front view of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the three-branched raw material pipe of the present invention; Figure 3 This is a cross-sectional perspective view of the present invention; Figure 4 This is a bottom-view perspective view of the powder inlet of the present invention; Figure 5 This is a cross-sectional view of the rotating bucket and the rotating grinding disc of the present invention; Figure 6 This is a top-view perspective structural diagram of the rotating bucket and the rotating grinding disc of the present invention; Figure 7 This is a bottom-view perspective structural diagram of the rotating bucket and the rotating grinding disc of the present invention; Figure 8 This is a rear-view perspective view of the overall three-dimensional structure of the present invention; Figure 9 This is a cross-sectional view of the rotating bucket, grinding disc, and extrusion plug of the present invention. Figure 10 This is a three-dimensional structural diagram of the rotating bucket, rotating grinding disc, and extrusion plug of the present invention; Figure 11 This is a three-dimensional structural diagram of the extrusion plug of the present invention; Figure 12 This is a three-dimensional structural diagram of the present invention with a lifting push rod.

[0016] Explanation of the labels in the diagram: 1. Spray shell, 101. Air inlet pipe, 102. Spray outlet pipe, 2. Mixing pipe, 201. Fixed plate, 202. Powder drop port, 203. Rotating bucket, 204. Grinding disc, 205. Rotating tube shaft, 206. Connecting frame, 207. Drive motor, 208. Grinding end, 209. Sealing ring, 210. Fixed shaft, 211. Guide plate, 3. Branch raw material pipe, 301. Raw material bin, 302. Fixed ring, 303. Lifting shaft, 304. Extrusion plug, 305. Connecting hole, 306. Lifting push rod. Detailed Implementation

[0017] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0018] First implementation method: Please see Figure 1 and Figure 2 A high-efficiency injection device for metallurgical furnaces includes an injection shell 1, with an air inlet pipe 101 and an outlet pipe 102 fixedly connected to both ends of the injection shell 1, a mixing pipe 2 fixedly connected to the top of the injection shell 1, a branch raw material pipe 3 fixedly connected to the top of the mixing pipe 2, and a raw material bin 301 fixedly connected to the top of the branch of the branch raw material pipe 3. Powdered coal and dry-quenched coke powder are stored separately in raw material silos 301. They are then transported to mixing pipes 2 via branch raw material pipes 3 for mixing. (The mixed raw materials also include graphite and coke. The number of branch raw material pipes 3 varies depending on the type and quantity of the raw materials. For example...) Figure 2 The three-branched raw material pipe 3 shown finally mixes the powder into the injection shell 1. The hot air entering from the air inlet pipe 101 blows the mixed powder toward the injection pipe 102 and finally into the blast furnace equipment. Please see Figures 3 to 7A fixed disk 201 is fixedly connected to the connection between the mixing pipe 2 and the injection housing 1. A powder drop port 202 is opened between the outer ring of the fixed disk 201 and the inner wall of the mixing pipe 2. A rotating bucket 203 is rotatably connected inside the mixing pipe 2. A rotating grinding disc 204 is fixedly connected to the lower port of the rotating bucket 203. The lower surface of the rotating grinding disc 204 is in rotatable contact with the upper surface of the fixed disk 201. The coal powder and dry quenched coke powder that converge in the mixing pipe 2 are ground and mixed by the rotating grinding disc 204 and the fixed disk 201, so that the agglomerated coal powder and dry quenched coke powder are crushed, thereby... The pulverized coal and dry-quenched coke powder are blown into the blast furnace in the form of powder spray, effectively improving the spraying effect of pulverized coal and dry-quenched coke powder. The upper surface of the fixed disk 201 is convex spherical, and the lower surface of the rotating grinding disk 204 is concave spherical, which facilitates the diffusion of pulverized coal and dry-quenched coke powder from the center of the fixed disk 201 to the edge, so that the mixed powder of pulverized coal and dry-quenched coke powder is evenly dispersed into the spraying shell 1, which facilitates the blowing of hot air in the spraying shell 1. Furthermore, grinding ends 208 are uniformly fixedly connected to the lower surface of the rotating grinding disk 204, which improves the grinding effect of pulverized coal and dry-quenched coke powder. The grinding effect of coke powder is achieved, and the grinding end 208 guides the coal powder and dry-quenched coke powder to diffuse towards the edge of the fixed disc 201. The outer ring of the rotating grinding disc 204 is fitted with a sealing ring 209, which slides in contact with the inner wall of the mixing pipe 2, effectively improving the sealing between the outer ring of the rotating grinding disc 204 and the inner wall of the mixing pipe 2, thereby effectively preventing the coal powder and dry-quenched coke powder from rising to the upper surface of the rotating grinding disc 204. A fixed shaft 210 is fixedly connected to the middle of the rotating grinding disc 204. The fixed shaft 210 passes through the lower port of the rotating bucket 203, and the external fixed shaft 210 is fixed. A guide plate 211 is connected, which is curved in an arc shape and slides in contact with the inner wall of the rotating bucket 203. When the rotating bucket 203 drives the coal powder and dry quenched coke powder inside to rotate, the guide plate 211 fixed on the fixed plate 201 plays the role of blocking the coal powder and dry quenched coke powder, and makes the coal powder and dry quenched coke powder move along the curved surface of the guide plate 211 towards the lower port of the rotating bucket 203, effectively improving the grinding effect of the coal powder and dry quenched coke powder, and effectively preventing the coal powder and dry quenched coke powder from clogging the lower port of the rotating bucket 203. When pulverized coal and dry-quenched coke powder enter the mixing pipe 2, the rotating bucket 203 drives the pulverized coal and dry-quenched coke powder to rotate. The guide plate 211 blocks and guides the pulverized coal and dry-quenched coke powder to move towards the lower port of the rotating bucket 203. The pulverized coal and dry-quenched coke powder pass through the lower port of the rotating bucket 203 and enter the gap between the rotating grinding disc 204 and the fixed disc 201. The rotating grinding disc 204 and the fixed disc 201 grind and mix the pulverized coal and dry-quenched coke powder, crushing the agglomerates of the pulverized coal and dry-quenched coke powder. The mixed powder after grinding and mixing diffuses outward from the edge of the fixed disc 201, so that the mixed powder of pulverized coal and dry-quenched coke powder is evenly dispersed into the injection shell 1, which facilitates the blowing of hot air in the injection shell 1, and thus facilitates the pulverized coal and dry-quenched coke powder to be blown into the blast furnace in the form of powder spray, effectively improving the injection effect of pulverized coal and dry-quenched coke powder.

[0019] Please see Figure 5 and Figure 8 A rotating tube shaft 205 is rotatably connected to the middle of the bottom end of the branch raw material tube 3. A connecting frame 206 is fixedly connected between the bottom end of the rotating tube shaft 205 and the top inner ring of the rotating bucket 203. A drive motor 207 is fixedly connected to the back of the bottom end of the branch raw material tube 3. The output end of the drive motor 207 is connected to the top end of the rotating tube shaft 205 through belt drive. The drive motor 207 drives the rotating tube shaft 205, which in turn drives the rotating bucket 203 to rotate via the connecting frame 206.

[0020] Second implementation method: Compared to the first embodiment, the main additions are a retaining ring 302 and a compression plug 304. The specific additions are as follows, while the remaining structures are the same as in the first embodiment.

[0021] Please see Figures 9 to 12A fixing ring 302 is fixedly connected to the connection between the branch raw material pipe 3 and the mixing pipe 2. The inner diameter of the fixing ring 302 is smaller than the inner diameter of the top end of the mixing pipe 2, and the bottom of the fixing ring 302 rotates in contact with the top edge of the rotating bucket 203. The fixing ring 302 covers the top edge of the rotating bucket 203, effectively preventing pulverized coal and dry-quenched coke powder from entering the gap between the rotating bucket 203 and the mixing pipe 2. The top of the inner ring of the fixing ring 302 is sloped, which facilitates the... The pulverized coal and dry-quenched coke powder falling from the branch raw material pipe 3 are guided into the rotating bucket 203. A lifting shaft 303 is sleeved in the middle of the rotating pipe shaft 205. A compression plug 304 is rotatably connected to the bottom end of the lifting shaft 303. When the compression plug 304 is in the descending state, the bottom of the compression plug 304 extends into the rotating bucket 203. As the compression plug 304 descends, it compresses the pulverized coal and dry-quenched coke powder in the rotating bucket 203, further pushing the pulverized coal and dry-quenched coke powder through the lower port of the rotating bucket 203, effectively preventing the pulverized coal and dry-quenched coke powder from passing through the lower port of the rotating bucket 203. The quenching powder clogs the lower port of the rotating hopper 203, and the bottom outer ring of the squeeze plug 304 contacts the top of the fixing ring 302. When the rotating hopper 203 stops rotating, the bottom outer ring of the squeeze plug 304 and the top of the fixing ring 302 are pressed together, causing the squeeze plug 304 to seal the upper part of the mixing pipe 2. When the blowing device stops blowing powder and only blows air, it effectively prevents gas leakage in the mixing pipe 2, thereby effectively improving the safety of the blowing device. The outer ring of the squeeze plug 304 is provided with a connecting hole 305. 5 is sleeved with the connecting frame 206, so that the extrusion plug 304 follows the rotating bucket 203 to rotate. When the extrusion plug 304 rotates, the coal powder and dry quenched coke powder attached to the top of the extrusion plug 304 are thrown off, effectively preventing the coal powder and dry quenched coke powder from adhering to the upper surface of the extrusion plug 304. The middle part of the branch raw material pipe 3 is fixedly connected with the lifting push rod 306. The output end of the lifting push rod 306 is fixedly connected to the top end of the lifting shaft 303. The lifting push rod 306 pushes the lifting shaft 303 to realize the lifting movement of the extrusion plug 304. When the rotating hopper 203 is filled with pulverized coal and dry-quenched coke powder, the lifting push rod 306 pushes the lifting shaft 303, causing the compression plug 304 to descend. The descending compression plug 304 compresses the pulverized coal and dry-quenched coke powder in the rotating hopper 203, pushing them through the lower port of the rotating hopper 203, effectively preventing the pulverized coal and dry-quenched coke powder from clogging the lower port of the rotating hopper 203. When the compression plug 304 descends to its lowest height, the outer ring of the descending compression plug 304 contacts the top of the fixing ring 302. The fixed ring 302 is used to prevent the extrusion plug 304 from continuing to descend, thereby effectively avoiding the extrusion plug 304 from causing extrusion on the guide plate 211 in the rotating bucket 203 and preventing the guide plate 211 from deforming due to extrusion. During the process of the lifting push rod 306 driving the extrusion plug 304 to rise and fall, the extrusion plug 304 is connected to the connecting frame 206 through the connecting hole 305 on the extrusion plug 304, so that the extrusion plug 304 follows the rotation of the rotating bucket 203. The rotating extrusion plug 304 effectively prevents the adhesion of coal powder and dry quenched coke powder. When the blowing device is in the state of stopping powder blowing and only blowing air, the descending squeeze plug 304 presses against the top of the fixed ring 302, causing the squeeze plug 304 to seal the top of the mixing pipe 2, cutting off the connection between the mixing pipe 2 and the branch raw material pipe 3, effectively preventing gas leakage in the mixing pipe 2, and thus effectively improving the safety effect of the blowing device.

[0022] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A high-efficiency injection device for metallurgical furnaces, comprising an injection housing (1), wherein an air inlet pipe (101) and an outlet pipe (102) are fixedly connected to both ends of the injection housing (1), characterized in that: The top of the spray housing (1) is fixedly connected to a mixing pipe (2), the top of the mixing pipe (2) is fixedly connected to a branch raw material pipe (3), and the top of the branch raw material pipe (3) is fixedly connected to a raw material silo (301). A fixed plate (201) is fixedly connected to the connection between the mixing pipe (2) and the spray housing (1). A powder drop port (202) is opened between the outer ring of the fixed plate (201) and the inner wall of the mixing pipe (2). A rotating bucket (203) is rotatably connected inside the mixing pipe (2). A rotating grinding disc (204) is fixedly connected to the lower port of the rotating bucket (203). The lower surface of the rotating grinding disc (204) is rotatably in contact with the upper surface of the fixed plate (201). A rotating tube shaft (205) is rotatably connected to the middle of the bottom end of the branch raw material pipe (3). A connecting frame (206) is fixedly connected between the bottom end of the rotating tube shaft (205) and the top inner ring of the rotating bucket (203). A drive motor (207) is fixedly connected to the back of the bottom end of the branch raw material pipe (3). The output end of the drive motor (207) is connected to the top end of the rotating tube shaft (205) by belt drive.

2. The high-efficiency injection device for metallurgical furnaces and kilns according to claim 1, characterized in that: The upper surface of the fixed disk (201) is convex spherical, the lower surface of the rotating grinding disk (204) is concave spherical, and grinding ends (208) are uniformly fixedly connected to the lower surface of the rotating grinding disk (204).

3. The high-efficiency injection device for metallurgical furnaces and kilns according to claim 1, characterized in that: The outer ring of the rotating grinding disc (204) is fitted with a sealing ring (209), which slides in contact with the inner wall of the mixing pipe (2).

4. The high-efficiency injection device for metallurgical furnaces and kilns according to claim 1, characterized in that: A fixed shaft (210) is fixedly connected to the middle of the rotating grinding disc (204). The fixed shaft (210) passes through the lower port of the rotating bucket (203), and a guide plate (211) is fixedly connected to the outside of the fixed shaft (210). The guide plate (211) is curved in an arc shape and slides in contact with the inner wall of the rotating bucket (203).

5. The high-efficiency injection device for metallurgical furnaces and kilns according to claim 1, characterized in that: A fixing ring (302) is fixedly connected to the connection part of the branch raw material pipe (3) and the mixing pipe (2). The inner diameter of the fixing ring (302) is smaller than the inner diameter of the top end of the mixing pipe (2), and the bottom of the fixing ring (302) rotates in contact with the top edge of the rotating bucket (203). The top of the inner ring of the fixing ring (302) is set with an inclined surface.

6. The high-efficiency injection device for metallurgical furnaces and kilns according to claim 5, characterized in that: A lifting shaft (303) is sleeved in the middle of the rotating tube shaft (205). A squeezing plug (304) is rotatably connected to the bottom end of the lifting shaft (303). When the squeezing plug (304) is in the descending state, the bottom of the squeezing plug (304) extends into the interior of the rotating bucket (203), and the bottom outer ring of the squeezing plug (304) contacts the top of the fixing ring (302).

7. A high-efficiency injection device for metallurgical furnaces and kilns according to claim 6, characterized in that: The outer ring of the compression plug (304) has a connecting hole (305), which is sleeved with the connecting bracket (206).

8. A high-efficiency injection device for metallurgical furnaces and kilns according to claim 6, characterized in that: A lifting push rod (306) is fixedly connected to the middle of the branch raw material pipe (3), and the output end of the lifting push rod (306) is fixedly connected to the top end of the lifting shaft (303).

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