Furnace front ditch repairing and hole plugging method for blast furnace

Abstract

The invention discloses a blast furnace stokehole ditch repairing and hole plugging method which comprises the following steps: firing a residual iron hole into a circular truncated cone shape by using a burning oxygen pipe, penetrating a cylindrical sleeper into the circular truncated cone-shaped residual iron hole, and pouring a refractory material into a molten iron main ditch, so that a gap between the molten iron main ditch and a large ditch mold and a gap between the sleeper and the residual iron hole are filled with the refractory material; and then, when the molten iron main runner is baked, the sleepers in the residual iron holes are ignited and combusted together. According to the ditch repairing and hole plugging method in front of the blast furnace, in the hole plugging process of the residual iron hole, the original irregular residual iron hole is poured into the regular cylindrical hole channel, then the regular cylindrical hole channel of the residual iron hole is filled with the ramming material, pushing-in of the ramming material is not blocked by the inner wall of the irregular hole channel, pushing-in resistance of the ramming material is smaller, and the ramming material is prevented from being blocked by the inner wall of the irregular hole channel. And the filling action is easier, the residual iron hole can be pushed in place in time and fully compacted, the reliability of blocking the residual iron hole is greatly ensured, and the risk that the iron leakage is increased due to the fact that a gap exists in the residual iron hole after the residual iron hole is blocked is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking and tapping, and in particular to a method for repairing trenches and plugging holes in front of a blast furnace. Background Art

[0002] The blast furnace is provided with a main molten iron ditch, a ridge ditch, a slag ditch, and a residual iron ditch in front of the blast furnace, and each ditch is cast with refractory materials. When tapping iron, in order to separate the molten iron from the slag, the main ditch is provided with a slag skimmer, as disclosed in the patent document of Chinese Patent No. 201210281607.2, which is mainly provided with a lintel on the ditch body, and then utilizes the characteristics of different densities of slag and iron, large density of molten iron, small density of slag, and slag floating above the molten iron, so that when passing through the slag skimmer, the slag is blocked by the lintel at the front side of the lintel and enters the slag ditch, while the molten iron passes over the lintel from the bottom of the lintel, enters the rear side of the slag skimmer, and then flows into the iron ditch, thus achieving the separation of molten iron and slag.

[0003] There is a residual iron eye on the bottom side wall of the ditch body on the rear side of the skimmer beam. The residual iron eye is used as a slag discharge channel. When the refractory material in the ditch body is eroded to a certain extent and the refractory material in the ditch body is re-cast, the residual iron eye needs to be opened to drain the slag in the ditch body. After the refractory material in the ditch body is re-cast, the residual iron eye is blocked to resume iron tapping. There are two ways to open the residual iron eye: one is to drill directly with a special residual iron eye opening machine, and the other is to drill to the red point with a rock drill and then burn it with an oxygen blowing pipe. No matter which of the above methods is used to open the residual iron eye, condensed slag will remain in the residual iron eye after the slag is discharged. In order to avoid the slag affecting the temperature of the residual iron eye during normal iron tapping and prevent the residual iron eye from burning through due to the presence of slag in it, before re-blocking the residual iron eye, it is often necessary to use an oxygen tube to burn the condensed slag remaining in the residual iron eye channel, and then fill the residual iron eye with ramming material to block the eye. The holes of the residual iron after burning in the oxygen tube are irregular cylindrical in shape, sometimes large and sometimes small. When the existing ramming material is directly filled into the irregular holes of the residual iron after burning to plug the holes, it is not only difficult to push the ramming material forward, which is time-consuming and laborious, but also the filled ramming material is difficult to be compacted throughout the entire cross section, and gaps are easily present in the middle, which greatly increases the risk of iron leakage and poses a great potential accident hazard. Summary of the invention

[0004] The purpose of the present invention is to provide a method for repairing trenches and plugging holes in front of a blast furnace.

[0005] The technical solution for achieving the purpose of the present invention is: a method for repairing trenches and plugging holes in front of a blast furnace, comprising the following steps: S1. After the slag in the main molten iron groove is cleaned, the original refractory material in the main molten iron groove is removed; and, the slag in the residual iron eye is burned clean with a burning oxygen tube, and the residual iron eye is burned into a truncated cone shape, wherein the aperture of the first end of the residual iron eye is larger than the aperture of the second end, and the first end of the residual iron eye is located at one end of the residual iron eye close to the main molten iron groove; S2. After the original refractory material in the main groove of the molten iron is removed in step S1, a large groove mold is placed in the main groove of the molten iron, wherein the cross section of the large groove mold is a trapezoidal shape with a wide top and a narrow bottom, and there is a gap between the large groove mold and the main groove of the molten iron; S3. After the residual iron eye is burned into a truncated cone in step S1, take a cylindrical sleeper, the sleeper passes through the residual iron eye burned into a truncated cone, the diameter of the sleeper is consistent with the aperture of the second end of the residual iron eye, the sleeper is fixed horizontally; S4. After step S2 and step S3 are completed, the gap between the main molten iron groove and the large groove mold is poured into the main molten iron groove to pour refractory material so that the gap between the main molten iron groove and the large groove mold, the gap between the sleepers and the residual iron eye are filled with refractory material; S5. After the refractory material is cast in the gap between the main molten iron groove and the large groove mold, the gap between the sleepers and the residual iron eye in step S4, the large groove mold is hoisted away; then, the main molten iron groove is baked to remove the moisture in the main molten iron groove, the main molten iron groove is repaired, and the sleepers in the residual iron eye are ignited and burned together when baking the groove; S6. After the sleepers are burned in step S5, the ashes in the residual iron eyelet are blown away, and then the residual iron eyelet is blocked.

[0006] Furthermore, in step S3, one end of the horizontally fixed sleeper is supported on the second end of the residual iron eye, and the other end of the sleeper is supported on the pad brick in the main molten iron groove. The diameter of the sleeper is consistent with the aperture of the second end of the residual iron eye, and one end of the horizontally fixed sleeper is directly supported on the second end of the residual iron eye without additional support; the other end of the sleeper can be supported on the pad brick in the main molten iron groove. The pad brick has a large structural strength, which can not only stably support the sleeper when pouring refractory materials, but also can be used as a refractory layer together with the refractory materials after pouring the refractory materials.

[0007] Furthermore, in step S5, the main channel of the molten iron is heated by burning gas or wood.

[0008] Furthermore, in step S6, compressed air is used to blow away the ashes in the residual iron eyelet channel.

[0009] The method for repairing trenches and plugging holes in front of a blast furnace of the present invention can not only re-cast the refractory material in the main trench of molten iron and plug the residual iron holes, but also, in the process of plugging the residual iron holes, the slag iron in the residual iron holes is burned clean by a burning oxygen tube, and the residual iron holes are burned into a truncated cone shape, and cylindrical sleepers are horizontally arranged in the truncated cone-shaped residual iron holes, so that the refractory material poured into the main trench of molten iron can enter the gap between the sleepers and the residual iron holes, and fill the gap between the sleepers and the residual iron holes, so that after the burning of the oxygen tube, the originally irregular residual iron holes can eventually form regular cylindrical channels. In this way, when the ramming material is filled into the regular cylindrical channels of the residual iron holes for plugging, the pushing of the ramming material is not blocked by the inner wall of the irregular channels, the pushing resistance of the ramming material is smaller, the filling action is easier, and the operation is more time-saving and labor-saving. And precisely because the ramming material is easier to push into the regular cylindrical hole of the residual iron eye, the ramming material is pushed in quickly and can be pushed into place in time, greatly reducing the risk of the ramming material being unable to be pushed in for a long time and drying up, which leads to gaps in the residual iron eye after plugging; plus in the regular cylindrical hole of the residual iron eye, when the ramming material is compacted, any position of the ramming material cross section is within the force surface, and the compaction of the ramming material is more reliable, and there is no local cross section of the ramming material that cannot be hit and cannot be compacted, resulting in gaps. The timely pushing of the ramming material into place and the comprehensive compaction greatly ensure the reliability of the plugging of the residual iron eye, avoid the risk of increased iron leakage due to gaps inside the residual iron eye after plugging, and reduce potential accidents.

[0010] The method for repairing trenches and plugging holes in front of a blast furnace of the present invention can simultaneously re-pour the refractory material in the large trench, fill the refractory material into the gap between the sleeper and the residual iron hole, and pour the refractory material into the main trench of molten iron, and simultaneously complete the two operations of re-pour the refractory material in the large trench and fill the refractory material into the gap between the sleeper and the residual iron hole, and the operation efficiency is high. And because the residual iron eye is horizontal, when refractory material is filled into the horizontal gap between the sleeper and the residual iron eye alone, the open horizontal end makes the filling operation very difficult. In order to reduce the difficulty of filling the refractory material into the horizontal gap between the sleeper and the residual iron eye, the method for repairing trenches and plugging holes in front of a blast furnace of the present invention performs the operation of filling the gap between the sleeper and the residual iron eye with the operation of re-pouring the refractory material in the large trench at the same time. The high pouring position of the refractory material in the large trench allows the refractory material to smoothly enter the gap between the sleeper and the residual iron eye, and completes the filling in the gap between the sleeper and the residual iron eye. It easily solves the problem of filling the refractory material into the gap between the sleeper and the residual iron eye, and makes the operation of filling the refractory material into the gap between the sleeper and the residual iron eye more convenient and reliable. At the same time, the residual iron eye is burned into a truncated cone shape. Under the structure that the first end of the residual iron eye with a larger aperture is close to one end of the molten iron main groove, the refractory material can more easily enter the gap between the sleeper and the residual iron eye, which greatly ensures the reliability of pouring into the residual iron eye, so that the channel of the residual iron eye can be successfully reshaped.

[0011] In addition, in the method for repairing trenches and plugging holes in front of a blast furnace of the present invention, the sleepers are passed through the residual iron holes burned into a truncated cone shape, and when the sleepers are used as a mold for pouring into the residual iron holes, there is no need for demolding in the subsequent sequence, and only the sleepers need to be ignited and burned. This greatly facilitates the demolding operation in the residual iron holes, especially after the use of the slag skimmer, when the temperature in the main trench of the molten iron is high, thermal expansion and contraction, and demolding are very difficult. By igniting and burning the sleepers, the inconvenience of demolding is easily resolved, so that the problem of difficult demolding in the residual iron holes can be solved. Compared with the demolding method of pulling out the mold in the residual iron holes 2, the refractory material poured in the residual iron holes is easily damaged by the pulling of the pulled-out mold. In the demolding method of the present invention of igniting and burning the sleepers, the inner wall of the residual iron hole channel will not be pulled by force, and the flatness and integrity are better, and the molding quality is higher. At the same time, the ignited sleepers can also bake the refractory materials in the residual iron eyes, thereby improving the structural strength of the refractory materials in the residual iron eyes, making the refractory materials in the residual iron eyes more stable and having a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a structural schematic diagram of the method for repairing trenches and plugging holes in front of a blast furnace when used. DETAILED DESCRIPTION

[0013] The preferred embodiment of the method for repairing trenches and plugging holes in front of a blast furnace of the present invention is described in detail below in conjunction with the accompanying drawings: like Figure 1 As shown, a method for repairing trenches and plugging holes in front of a blast furnace comprises the following steps: S1. After the slag iron in the main molten iron groove 1 is cleaned, the original refractory material in the main molten iron groove 1 is removed; and, while the slag iron in the residual iron eye 2 is burned clean with a burning oxygen tube, the residual iron eye 2 is burned into a truncated cone shape, the aperture of the first end 21 of the residual iron eye 2 is larger than the aperture of the second end 22, and the first end 21 of the residual iron eye 2 is located at one end of the residual iron eye 2 close to the main molten iron groove 1; S2. After the original refractory material in the main molten iron groove 1 is removed in step S1, a large groove mold 10 is placed in the main molten iron groove 1, wherein the cross section of the large groove mold 10 is a trapezoidal shape with a wide top and a narrow bottom, and a gap is formed between the large groove mold 10 and the main molten iron groove 1; S3. After the residual iron eye 2 is burned into a truncated cone in step S1, take a cylindrical sleeper 3, the sleeper 3 passes through the residual iron eye 2 burned into a truncated cone, the diameter of the sleeper 3 is consistent with the diameter of the second end 22 of the residual iron eye 2, the sleeper 3 is fixed horizontally; S4. After step S2 and step S3 are completed, the gap between the main molten iron groove 1 and the large groove mold 10 is poured into the main molten iron groove 1 to pour refractory material so that the gap between the main molten iron groove 1 and the large groove mold 10, the gap between the sleepers 3 and the residual iron eye 2 are filled with refractory material; S5. After the refractory material is cast in the gap between the main molten iron groove 1 and the large groove mold 10 and the gap between the sleeper 3 and the residual iron eye 2 in step S4, the large groove mold 10 is hoisted away; then, the main molten iron groove 1 is baked to remove the moisture in the main molten iron groove 1, and the repair of the main molten iron groove 1 is completed, and the sleepers 3 in the residual iron eye 2 are ignited and burned together during the baking process; S6. After the sleepers 3 are burned in step S5, the ashes in the residual iron eye 2 are blown clean, and then the residual iron eye 2 is blocked.

[0014] The method for repairing trenches and plugging holes in front of a blast furnace of the present invention is used for opening the residual iron holes after the refractory materials in the trenches are corroded to a certain extent, and then the refractory materials in the trenches are re-poured and repaired, and the opened residual iron holes are plugged again.

[0015] Specifically, when the refractory material in the large groove is corroded to a certain extent and needs to be re-cast and repaired, the residual iron eye is opened to completely discharge the slag iron in the molten iron main groove 1 through the residual iron eye 2. After the slag iron in the molten iron main groove 1 is drained, the original refractory material in the molten iron main groove 1 is removed. After the original refractory material in the molten iron main groove 1 is removed, the large groove mold 10 is placed in the molten iron main groove 1, and the refractory material is cast into the molten iron main groove 1. After the refractory material in the gap between the molten iron main groove 1 and the large groove mold 10 is cast and formed, the large groove mold 10 is lifted away, and the newly cast molten iron main groove 1 is baked to complete the casting and repair of the refractory material in the large groove.

[0016] When re-blocking the opened residual iron eye, first, after draining the slag iron in the main groove 1 of molten iron, use a burning oxygen tube to burn the slag iron in the residual iron eye 2, and at the same time, burn the residual iron eye 2 into a truncated cone shape; then, before pouring refractory material into the main groove 1 of molten iron and re-pouring the refractory material in the large groove, a horizontally arranged sleeper 3 is passed through the residual iron eye 2; then, when pouring refractory material into the main groove 1 of molten iron and re-pouring the refractory material in the large groove, the refractory material poured into the main groove 1 of molten iron fills the gap between the sleeper 3 and the residual iron eye 2; after the refractory material poured in the main groove 1 of molten iron is formed, when baking the groove, the sleeper 3 is ignited and burned to ashes, and then the channel of the residual iron eye 2 is blocked to complete the blocking.

[0017] The method for repairing trenches and plugging holes in front of a blast furnace of the present invention can not only re-pour the refractory material in the main trench 1 of molten iron and plug the residual iron eye 2, but also, in the process of plugging the residual iron eye 2, while using a burning oxygen tube to burn the slag iron in the residual iron eye 2, by burning the residual iron eye 2 into a truncated cone shape and horizontally arranging a cylindrical sleeper 3 in the truncated cone-shaped residual iron eye 2, the refractory material poured into the main trench 1 of molten iron can enter the gap between the sleeper 3 and the residual iron eye 2, and fill the gap between the sleeper 3 and the residual iron eye 2, so that after the burning of the oxygen tube, the originally irregular residual iron eye 2 can eventually form a regular cylindrical channel. In this way, when the ramming material is filled into the regular cylindrical channel of the residual iron eye 2 for plugging, the pushing of the ramming material is not blocked by the inner wall of the irregular channel, the resistance of the pushing of the ramming material is smaller, the filling action is easier, and the operation is more time-saving and labor-saving. And precisely because the ramming material is easier to push into the regular cylindrical hole of the residual iron eye 2, the ramming material is pushed in at a fast speed and can be pushed into place in time, greatly reducing the risk of the ramming material being unable to be pushed in place for a long time and drying up, resulting in gaps in the residual iron eye 2 after the eye is blocked; plus in the regular cylindrical hole of the residual iron eye 2, when the ramming material is compacted, any position of the ramming material cross section is within the force surface, and the compaction of the ramming material is more reliable, and there is no local cross section of the ramming material that cannot be hit and cannot be compacted, resulting in gaps. The timely pushing of the ramming material into place and the comprehensive compaction greatly ensure the reliability of the blocking of the residual iron eye 2, avoid the risk of increased iron leakage due to gaps inside the residual iron eye 2 after the eye is blocked, and reduce potential accidents.

[0018] The method for repairing trenches and plugging holes in front of a blast furnace of the present invention can simultaneously re-pour the refractory material in the large trench, fill the refractory material into the gap between the sleeper 3 and the residual iron hole 2, and pour the refractory material into the main trench 1 of molten iron, and simultaneously complete the two operations of re-pour the refractory material in the large trench and fill the refractory material into the gap between the sleeper 3 and the residual iron hole 2, and the operation efficiency is high. And because the residual iron eye 2 is horizontal, when the refractory material is filled into the horizontal gap between the sleeper 3 and the residual iron eye 2 alone, the open horizontal end makes the filling operation very difficult. In order to reduce the difficulty of filling the refractory material into the horizontal gap between the sleeper 3 and the residual iron eye 2, the method for repairing trenches and plugging holes in front of a blast furnace of the present invention performs the operation of filling the refractory material into the gap between the sleeper 3 and the residual iron eye 2 and re-pouring the refractory material in the large trench at the same time. The high pouring position of the refractory material in the large trench allows the refractory material to smoothly enter the gap between the sleeper 3 and the residual iron eye 2, completing the filling of the gap between the sleeper 3 and the residual iron eye 2. It easily solves the problem of filling the refractory material into the gap between the sleeper 3 and the residual iron eye 2, and makes the operation of filling the refractory material into the gap between the sleeper 3 and the residual iron eye 2 more convenient and reliable. At the same time, the residual iron eye 2 is burned into a truncated cone shape. Under the structure that the first end 21 of the residual iron eye 2 with a larger aperture is close to one end side of the molten iron main groove 1, the refractory material can more easily enter the gap between the sleeper 3 and the residual iron eye 2, which greatly ensures the reliability of pouring into the residual iron eye 2, so that the channel of the residual iron eye 2 can be successfully reshaped.

[0019] In addition, in the method for repairing trenches and plugging holes in front of a blast furnace of the present invention, the sleeper 3 is passed through the residual iron eye 2 burned into a truncated cone shape, and when the sleeper 3 is used as a mold for pouring into the residual iron eye 2, there is no need for demolding in the subsequent sequence, and the sleeper 3 only needs to be ignited and burned to ashes, which greatly facilitates the demolding operation in the residual iron eye 2, especially after the slag skimmer is used, the temperature in the main trench 1 of the molten iron is high, and the thermal expansion and contraction and demolding are very difficult. By igniting and burning the sleeper 3, the problem of inconvenient demolding is easily resolved, so that the problem of difficult demolding in the residual iron eye 2 can be solved. And compared with the demolding method of pulling out the mold in the residual iron eye 2, the refractory material poured in the residual iron eye 2 is pulled by the pulled-out mold and is easily damaged, in the demolding method of the present invention of igniting and burning the sleeper 3, the inner wall of the channel of the residual iron eye 2 will not be pulled by force, the flatness and integrity are better, and the molding quality is higher. At the same time, the ignited sleepers 3 can also bake the refractory material in the residual iron eye 2, thereby improving the structural strength of the refractory material in the residual iron eye 2, making the refractory material in the residual iron eye 2 more stable and having a longer service life.

[0020] In the method for repairing trenches and plugging holes in front of a blast furnace of the present invention, preferably, in step S3, one end 31 of the horizontally fixed sleeper 3 is supported on the second end 22 of the residual iron eye 2, and the other end 32 of the sleeper 3 is supported on the padding brick 4 in the main molten iron trench 1. The diameter of the sleeper 3 is consistent with the aperture of the second end 22 of the residual iron eye 2, and one end 31 of the horizontally fixed sleeper 3 is directly supported on the second end 22 of the residual iron eye 2 without additional support; the other end 32 of the sleeper 3 can be supported on the padding brick 4 in the main molten iron trench 1, and the padding brick 4 has a large structural strength, which can not only stably support the sleeper 3 when pouring refractory materials, but also can serve as a refractory layer together with the refractory materials after the refractory materials are poured.

[0021] In the method for repairing and plugging holes in front of a blast furnace of the present invention, preferably, in step S5, the main molten iron ditch 1 is heated by burning coal gas or wood.

[0022] The method for repairing trenches and plugging holes in front of a blast furnace of the present invention is preferably such that in step S6, compressed air is used to blow away the ash in the hole of the residual iron eye 2.

[0023] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for repairing trenches and plugging holes in front of a blast furnace, characterized in that: The following steps are involved: S1. After the slag in the main molten iron groove is cleaned, the original refractory material in the main molten iron groove is removed; and, the slag in the residual iron eye is burned clean with a burning oxygen tube, and the residual iron eye is burned into a truncated cone shape, wherein the aperture of the first end of the residual iron eye is larger than the aperture of the second end, and the first end of the residual iron eye is located at one end of the residual iron eye close to the main molten iron groove; S2. After the original refractory material in the main groove of the molten iron is removed in step S1, a large groove mold is placed in the main groove of the molten iron, wherein the cross section of the large groove mold is a trapezoidal shape with a wide top and a narrow bottom, and there is a gap between the large groove mold and the main groove of the molten iron; S3. After the residual iron eye is burned into a truncated cone in step S1, take a cylindrical sleeper, the sleeper passes through the residual iron eye burned into a truncated cone, the diameter of the sleeper is consistent with the aperture of the second end of the residual iron eye, the sleeper is fixed horizontally; S4. After step S2 and step S3 are completed, the gap between the main molten iron groove and the large groove mold is poured into the main molten iron groove to pour refractory material so that the gap between the main molten iron groove and the large groove mold, the gap between the sleepers and the residual iron eye are filled with refractory material; S5. After the refractory material is cast in the gap between the main molten iron groove and the large groove mold, the gap between the sleepers and the residual iron eye in step S4, the large groove mold is hoisted away; then, the main molten iron groove is baked to remove the moisture in the main molten iron groove, the main molten iron groove is repaired, and the sleepers in the residual iron eye are ignited and burned together when baking the groove; S6. After the sleepers are burned in step S5, the ashes in the residual iron eyelet are blown away, and then the residual iron eyelet is blocked.

2. The method for repairing trenches and plugging holes in front of a blast furnace according to claim 1, characterized in that: In step S3, one end of the horizontally fixed sleeper is supported on the second end of the residual iron eye, and the other end of the sleeper is supported on the pad bricks in the main channel of molten iron.

3. The method for repairing trenches and plugging holes in front of a blast furnace according to claim 1, characterized in that: In step S5, the main channel of the molten iron is heated by gas or wood combustion.

4. The method for repairing trenches and plugging holes in front of a blast furnace according to claim 1, characterized in that: In step S6, compressed air is used to blow away the ashes in the residual iron eyelet channel.

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