Online cleaning device and method for nodules of sintering ignition furnace

Abstract

The online cleaning device comprises a round roller, a material distribution roller, a material flattening plate, a material distribution supporting plate, an ignition furnace and a U-shaped metal material cutter which are located on a sintering machine, and the U-shaped metal material cutter is embedded in a gap between the material distribution supporting plate and a front cover movable door curtain. A plurality of U-shaped metal cutters are vertically inserted into the sintered material layer side by side in an inverted U shape and are exposed by a certain height; after a mixture is distributed to a sintering trolley through a round roller and a material distribution roller, the mixture on the sintering machine sequentially passes through a material flattening plate and a material distribution supporting plate to move to a front cover movable door curtain, a burner nozzle, an ignition furnace beam and a rear cover movable door curtain on the ignition furnace; and the embedded U-shaped metal cutter is scratched and collided with the nodules in the ignition furnace, so that the nodules are cleaned. The pre-embedded U-shaped material cutter is matched with a corresponding operation method, on-line cleaning is achieved through advancing power of the sintering machine, and the influence of nodulation of the ignition furnace on sintering production is eliminated in time.

Description

Technical Field

[0001] This invention relates to the field of sintering machine ignition furnace technology in the metallurgical industry, specifically to an online cleaning device and method for sintering ignition furnace nodules. Background Technology

[0002] The ignition system is a crucial step in sintering production, directly impacting the sintering process, technical and economic indicators, and the quality of the sintered ore. The ignition furnace, as the ignition equipment, works by igniting pipeline-inlet gas through multiple burners. A mixture of solid fuel pre-loaded into the sintering machine trolley is also ignited. Under the suction of the main exhaust fan, the mixture burns from top to bottom, ultimately forming sintered ore as the sintering process continues.

[0003] The combustion temperature inside the ignition furnace is generally controlled between 1000-1200℃, and can reach a maximum of 1400℃. Due to the high-temperature melting of the igniter and the adhesion of the sintering mixture sprayed onto the inner surface of the furnace top, or the sagging of some refractory material from the precast blocks mixed with the sintering mixture, furnace nodules can form. This is especially true when the sintering material layer is increased (or in ignition furnaces designed to reduce gas consumption by lowering the furnace height), leading to a shorter distance between the material surface and the furnace top, making nodulation more likely. Nodulation in the ignition furnace affects the ignition effect on the sintering machine surface, causing a yellow band to appear at the nodulation site. This necessitates increased gas consumption and enhanced local ignition to eliminate the yellow band, increasing sintering production costs. In severe cases, the nodulated material column scrapes against the material surface, causing hooks and disrupting the uniformity of the sintering airflow distribution, leading to fluctuations in the sintering process, increased powder return, and severely impacting the quality and economic and technical indicators of the sintered ore.

[0004] Regarding common nodule locations in ignition furnaces, nodules near the burners on both sides can be removed online using a long chisel through the observation holes on both sides of the furnace. Nodules near the sides of the furnace (near the ends of the trolley) can also be removed online using a relatively simple nodule removal device. However, nodules in the middle of the ignition furnace (such as the furnace beam) are difficult to remove online and are generally prevented through improvements in operating methods. Alternatively, they can be cleaned inside the furnace during planned maintenance shutdowns. Planned maintenance is cyclical, which prolongs the impact of nodule formation. Unplanned maintenance solely for nodule removal is costly and expensive.

[0005] In the prior art, patent number CN 109373772 A discloses a sintering machine ignition furnace nodule control device, the main purpose of which is to provide a method for preventing and controlling nodule formation in the ignition furnace; CN 109210958 A discloses a sintering machine ignition furnace nodule removal device, which provides an online cleaning method for nodules near both sides of the ignition furnace (near the two ends of the trolley), but this method cannot treat nodules in the middle of the ignition furnace; and patent number CN 217929844 U provides a nodule cleaning device for sintering ignition furnaces, which can achieve online cleaning of nodules on the furnace walls and furnace top inside the ignition furnace, but requires an additional set of special cleaning devices, which increases equipment costs and cannot clean nodules in ignition furnaces with long insulation sections. Summary of the Invention

[0006] The purpose of this invention is to provide an online cleaning device and method for sintering furnace nodules. Addressing the problem of difficulty in online cleaning of nodules, especially those on the inner surface of the furnace, after their formation, this invention uses a pre-embedded "U"-shaped cutting tool matched with a corresponding operating method. It utilizes the sintering machine's propulsion to achieve online cleaning, promptly eliminating the impact of furnace nodules on sintering production, thus overcoming the shortcomings of existing technologies.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An online cleaning device for sintering furnace nodules includes a circular roller, a feeding roller, a flat material plate, a feeding support plate, and an ignition furnace located on a sintering machine. The ignition furnace is equipped with a front movable door curtain, a burner, an ignition furnace beam, and a rear movable door curtain. It also includes U-shaped metal cutting tools, one or more of which are provided according to the location and width of the nodules in the ignition furnace. One or more of the U-shaped metal cutting tools are embedded in the gap between the feeding support plate and the front movable door curtain. Multiple U-shaped metal cutting tools are inserted vertically into the sintering material layer in an inverted U-shape, with a certain height exposed. After the mixture is fed to the sintering trolley by the circular roller and the feeding roller, the mixture on the sintering machine sequentially passes through the flat material plate and the feeding support plate to the front movable door curtain, the burner, the ignition furnace beam, and the rear movable door curtain on the ignition furnace. Using the running power of the sintering machine, the embedded U-shaped metal cutting tools scrape and collide with the nodules inside the ignition furnace, cleaning them away.

[0009] Furthermore, the U-shaped metal cutting tool is formed by bending multiple threaded metal bars with a length of 3-5 cm and a diameter of 3 times the height between the material surface of the sintering trolley and the top of the ignition furnace.

[0010] Furthermore, the two ends of the U-shaped metal cutting tool are ground into sharp, pointed structures.

[0011] Furthermore, it also includes a manual hoist and a long chisel for pulling or prying out the U-shaped metal cutter 10 when it enters or exits the rear cover movable door curtain of the ignition furnace 5.

[0012] This invention also provides another technical solution: an online cleaning method for nodules in a sintering furnace, based on an online cleaning device for nodules in a sintering furnace, comprising the following steps:

[0013] S1: Measure the height between the sintering trolley material surface and the top of the ignition furnace: Measure the distance from the grate bar on the empty trolley to the top of the furnace during maintenance. Subtract the height of the sintering material layer from the distance from the grate bar surface on the empty trolley to the top of the furnace to get the height between the sintering trolley material surface and the top of the ignition furnace.

[0014] S2: Making U-shaped metal cutting tools: Process and bend multiple sections of threaded metal bars with a length of about 3 times the height between the sintering trolley material surface and the top of the ignition furnace, and a diameter of 3-5cm, into U-shaped bars, and grind both ends of the bars to be sharp.

[0015] S3: Determine the location of the nodule in the ignition furnace. Visually estimate the approximate location of the nodule by observing the side hole of the ignition furnace or the position where the sintering material enters or exits the ignition furnace. Then lift the material support plate, the front cover movable door curtain corresponding to the nodule, and the rear cover movable door curtain.

[0016] S4: Pre-embedded U-shaped metal cutting tools: According to the location and width of the sintering nodule in the ignition furnace, insert one or more U-shaped metal cutting tools into the sintering material layer vertically in a U-shape in the gap between the material feeding plate and the front cover movable door curtain, and expose a certain height.

[0017] S5: Start the sintering machine. The U-shaped metal cutter moves forward with the sintering machine. When it reaches the front cover movable door curtain, observe whether the exposed top of the U-shaped metal cutter is close to the front cover movable door curtain. If the distance is far, pause the sintering machine briefly and use the equipped manual hoist hook rope to pull up the U-shaped metal cutter until it is basically in contact with the front cover movable door curtain.

[0018] S6: Using the power of the sintering machine, the U-shaped metal cutting tool scrapes and collides with the nodules to remove them;

[0019] S7: After the U-shaped metal cutting tool has moved in and out of the cover and the movable door curtain is closed, use the provided long chisel to pry it out, let it cool naturally and keep it for the next deburring use;

[0020] S8: If the nodule removal effect is not as expected, repeat S4-S7 using the spare U-shaped metal cutter.

[0021] Furthermore, it also includes the following steps:

[0022] S101: By extending the height of the U-shaped metal cutter, the stability of the insertion depth of the U-shaped metal cutter into the material surface is improved;

[0023] S102: Before the U-shaped metal cutter is inserted into the material surface, increase the compaction of the mixture through the flat plate, that is, the accumulation height of the mixture in front of the flat plate;

[0024] S103: Increase the number and rows of U-shaped metal cutting blades inserted into the material layer, and improve the efficiency of burr removal through combination arrangement.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The online cleaning device and method for sintering furnace nodules of the present invention uses a pre-embedded "U"-shaped cutting tool and the sintering machine's propulsion to remove nodules, eliminating the need for an additional power device for nodule removal. It is convenient to operate, easy to master and solidify, and solves the problem of difficult online cleaning of nodules in the center of the ignition furnace, while maximizing the protection of the refractory material of the ignition furnace. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the material distribution in the sintering machine of the present invention;

[0028] Figure 2 This is a structural diagram of the U-shaped metal cutting tool of the present invention;

[0029] Figure 3 This is a schematic diagram showing the installation position of the U-shaped metal cutting tool of the present invention;

[0030] Figure 4 This is a photograph of the actual U-shaped metal cutting tool of the present invention.

[0031] Figure 5 This is a photograph of the material surface corresponding to the location of the nodule formation in the ignition furnace of this invention.

[0032] Figure 6 This is a photograph of the U-shaped metal cutting tool embedded in the present invention.

[0033] Figure 7 The images show the effect of the material surface before and after cleaning the nodules in the ignition furnace according to the present invention.

[0034] In the diagram: 1. Circular roller; 2. Fabric roller; 3. Flat material plate; 4. Fabric support plate; 5. Ignition furnace; 6. Front cover movable door curtain; 7. Burner; 8. Ignition furnace beam; 9. Rear cover movable door curtain; 10. U-shaped metal cutting knife. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-3 This invention addresses the challenge of online cleaning of nodules at different locations in a sintering furnace, particularly those at the center. An embodiment of this invention provides an online nodule cleaning device for a sintering furnace, comprising a circular roller 1, a feeding roller 2, a flat material plate 3, a feeding support plate 4, and an ignition furnace 5, all located on the sintering machine. The flat material plate 3 controls the height of the sintering material layer and is adjustable vertically. The feeding support plate 4 is used to level the material surface and is a hinged door type, allowing it to be lifted away from the surface of the sintering material layer. The ignition furnace 5 is equipped with a front movable door curtain 6 (which can be lifted), a burner 7, an ignition furnace beam 8, and a rear movable door curtain 9 (which can be lifted). This invention also includes a U-shaped metal cutting tool 10, the two ends of which are ground into sharp, pointed blade-like structures for better and more secure insertion into the material layer. One or more U-shaped metal cutting tools 10 are provided according to the location and width of the nodules in the ignition furnace. One or more of the U-shaped metal cutting tools 10 are embedded in the gap between the material feeding plate 4 and the front cover movable door curtain 6. Multiple U-shaped metal cutting tools 10 are inserted vertically into the sintering material layer in an inverted U-shape and exposed at a certain height. After the mixture is fed to the sintering trolley by the round roller 1 and the material feeding roller 2, the mixture on the sintering machine passes through the flat material plate 3 and the material feeding plate 4 in sequence to the front cover movable door curtain 6, the burner 7, the ignition furnace beam 8 and the rear cover movable door curtain 9 on the ignition furnace 5. Using the running power of the sintering machine, the nodules are cleaned by the collision between the embedded U-shaped metal cutting tools 10 and the nodules inside the ignition furnace 5.

[0037] In the above embodiments, the present invention is also equipped with a manual hoist and a long chisel, used to pull or pry out the U-shaped metal cutter 10 when it moves in and out of the rear cover movable door curtain 9 on the ignition furnace 5, and also to facilitate the adjustment of the height of the U-shaped metal cutter 10.

[0038] To better explain the above-described device, this embodiment of the invention also provides an online cleaning method for sintering furnace nodules, based on the above-described online cleaning device, comprising the following steps:

[0039] S1: Measure the height between the sintering car material surface and the top of the ignition furnace. For example, during maintenance, the distance from the grate bar on the empty car to the top of the furnace can be measured. Since the height of the sintering material layer is known during normal production, the distance from the grate bar surface on the empty car to the top of the furnace minus the height of the sintering material layer is the height between the sintering car material surface and the top of the ignition furnace.

[0040] S2: Making a U-shaped metal cutting tool 10:

[0041] 1) Multiple sections of threaded steel bars, each 0.7m long (approximately 3 times the height between the sintering trolley material surface and the top of the ignition furnace) and 3cm in diameter, are all processed and bent into "U"-shaped bars.

[0042] 2) Further sharpen both ends of the "U"-shaped bar to create a "U"-shaped bar cutting tool, such as... Figure 2 As shown;

[0043] 3) Prepare the necessary tools: a manual hoist; a long chisel;

[0044] S3: Determine the location of the nodule in the ignition furnace. Visually estimate the approximate location of the nodule by observing the side hole of the ignition furnace or the position where the sintering material enters or exits the ignition furnace. Raise the material support plate 4, the front cover movable door curtain 6 and the rear cover movable door curtain 9 corresponding to the nodule to prevent the U-shaped metal cutting knife 10 from being blocked during the nodule cleaning operation.

[0045] S4: Pre-embedded U-shaped metal cutting knife 10: After a short 5-minute pause of the sintering machine, according to the location and width of the nodule in the ignition furnace, one or more U-shaped metal cutting knives 10 are pressed down into a U shape and vertically inserted into the sintering material layer in the gap between the material feeding plate 4 and the front cover movable door curtain 6, with about 15cm exposed.

[0046] S5: Start the sintering machine. The U-shaped metal cutter 10 moves forward with the sintering machine. When it reaches the front cover movable curtain 6, observe whether the exposed top of the U-shaped metal cutter 10 is close to the front cover movable curtain 6. If the distance is far, pause the sintering machine for 5 minutes and use the equipped manual hoist hook rope to pull up the U-shaped metal cutter 10 until it is basically in contact with the front cover movable curtain 6, so that the U-shaped metal cutter 10 can get as close as possible to the nodules to be cleaned.

[0047] S6: Using the power of the sintering machine, the U-shaped metal cutting tool 10 scrapes and collides with the nodules to clean them;

[0048] S7: After the U-shaped metal cutting knife 10 moves in and out and the movable door curtain 9 is covered, use the provided long chisel to pry it out, let it cool naturally and keep it for the next deburring use;

[0049] S8: If the nodule removal effect is not as expected, repeat S4-S7 using the spare U-shaped metal cutter 10.

[0050] To further improve the speed and effectiveness of nodule removal, further optimizations can be made based on the nodule removal results, as follows:

[0051] (1) By extending the height of the U-shaped metal cutter 10, the stability of the insertion depth of the U-shaped metal cutter 10 into the material surface is improved, and it is prevented from tilting when it collides with the nodule, which would affect the nodule removal effect;

[0052] (2) In order to further prevent the tilting phenomenon when the cutting knife collides with the nodule, before the U-shaped metal cutting knife 10 is inserted into the material surface, the compaction of the mixture through the flat plate 3 is increased, that is, the stacking height of the mixture in front of the flat plate 3.

[0053] (3) Increase the number and rows of U-shaped metal cutting blades 10 inserted into the material layer, and improve the efficiency of removing lumps through combination arrangement.

[0054] (4) Implementing this invention in the early stage of nodule formation in the ignition furnace will result in better nodule removal effect. See reference. Figure 4-7 .

[0055] In summary, the present invention provides an online cleaning device and method for sintering furnace nodules, which addresses the problem of difficulty in cleaning nodules online, especially on the inner surface of the sintering furnace after nodule formation. It uses a pre-embedded U-shaped metal cutting tool 10 matched with a corresponding operation method, and utilizes the sintering machine's travel power to achieve online cleaning, thus promptly eliminating the impact of nodules on sintering production. It does not require additional cost investment, is convenient to operate, and is easy to master.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An online cleaning device for sintering furnace nodules, comprising a circular roller (1), a feeding roller (2), a flat material plate (3), a feeding support plate (4), and an ignition furnace (5) located on a sintering machine, wherein the ignition furnace (5) is provided with a front cover movable door curtain (6), a burner (7), an ignition furnace beam (8), and a rear cover movable door curtain (9); characterized in that, It also includes U-shaped metal cutting tools (10). There are one or more U-shaped metal cutting tools (10) according to the location and width of the ignition furnace nodules. One or more of the U-shaped metal cutting tools (10) are embedded in the gap between the material feeding plate (4) and the front cover movable door curtain (6). Multiple U-shaped metal cutting tools (10) are inserted vertically into the sintering material layer in a U-shape and exposed at a certain height. After the mixture is fed to the sintering trolley by the round roller (1) and the material feeding roller (2), the mixture on the sintering machine passes through the flat material plate (3) and the material feeding plate (4) in sequence to the front cover movable door curtain (6), the burner (7), the ignition furnace beam (8) and the rear cover movable door curtain (9) on the ignition furnace (5). Using the running power of the sintering machine, the embedded U-shaped metal cutting tools (10) scrape and collide with the nodules inside the ignition furnace (5) to clean the nodules.

2. The online cleaning device for sintering furnace nodules as described in claim 1, characterized in that: The U-shaped metal cutting tool (10) is made by bending multiple threaded metal bars with a length of 3-5 cm and a diameter of 3 times the height between the material surface of the sintering trolley and the top of the ignition furnace.

3. The online cleaning device for sintering furnace nodules as described in claim 2, characterized in that: The two ends of the U-shaped metal cutting tool (10) are ground into sharp, pointed structures.

4. The online cleaning device for sintering furnace nodules as described in claim 1, characterized in that: It also includes a manual hoist and a long chisel for pulling or prying out the U-shaped metal cutter (10) as it enters or exits the rear cover movable door curtain (9) on the ignition furnace (5).

5. A method for online cleaning of nodules in a sintering ignition furnace, implemented based on the online cleaning device for nodules in a sintering ignition furnace as described in claim 1, characterized in that: Includes the following steps: S1: Measure the height between the sintering trolley material surface and the top of the ignition furnace: Measure the distance from the grate bar on the empty trolley to the top of the furnace during maintenance. Subtract the height of the sintering material layer from the distance from the grate bar surface on the empty trolley to the top of the furnace to get the height between the sintering trolley material surface and the top of the ignition furnace. S2: Making U-shaped metal cutting tool (10): Process and bend multiple sections of threaded metal bars with a length of about 3 times the height between the sintering trolley material surface and the top of the ignition furnace and a diameter of 3-5cm into U-shaped bars, and grind both ends of them to be sharp. S3: Determine the location of the ignition furnace nodule by visually estimating the approximate location of the nodule through the observation hole on the side of the ignition furnace or the position where the sintering material enters or exits the ignition furnace; and lift the material support plate (4), the front cover movable door curtain (6) corresponding to the nodule, and the rear cover movable door curtain (9). S4: Pre-embedded U-shaped metal cutting knife (10): According to the location and width of the sintering nodule in the ignition furnace, one or more U-shaped metal cutting knives (10) are inserted vertically into the sintering material layer in a U-shape in the gap between the material feeding plate (4) and the front cover movable door curtain (6), and exposed to a certain height. S5: Start the sintering machine. The U-shaped metal cutter (10) moves forward with the sintering machine. When it reaches the front cover movable door curtain (6), observe whether the exposed top of the U-shaped metal cutter (10) is close to the front cover movable door curtain (6). If the distance is far, pause the sintering machine briefly and pull up the U-shaped metal cutter (10) with the equipped manual hoist hook rope until it is basically in contact with the front cover movable door curtain (6). S6: Using the power of the sintering machine, the U-shaped metal cutting tool (10) scrapes and collides with the nodule to clean it; S7: After the U-shaped metal cutting knife (10) moves in and out of the back cover movable door curtain (9), use the equipped long chisel to pry it out, let it cool naturally and keep it for the next tumor removal; S8: If the nodule removal effect is not as expected, repeat S4-S7 using the spare U-shaped metal cutter (10).

6. The method for online cleaning of nodules in a sintering furnace as described in claim 5, characterized in that: It also includes the following steps: S101: By extending the height of the U-shaped metal cutter (10), the stability of the insertion depth of the U-shaped metal cutter (10) into the material surface is improved; S102: Before the U-shaped metal cutter (10) is inserted into the material surface, the compaction of the mixture through the flat plate (3) is increased, that is, the stacking height of the mixture in front of the flat plate (3); S103: Increase the number and rows of U-shaped metal cutting blades (10) inserted into the material layer, and improve the efficiency of tumor removal through combination arrangement.

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