Method for quickly disassembling converter mouth

Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to a method for quickly disassembling a converter mouth, which comprises the following steps of: 1) cleaning accumulated slag on the surface of a cast iron mouth; 2) folding the front end of the burning tube into a right angle, and connecting the burning tube with a paper tube and an oxygen source; (3) the converter is shaken to 90-95 degrees in front of the converter, the paper tube is ignited, oxygen is introduced into a burning tube, and a tube body of the burning tube is led; (4) firstly, the converter is rocked to 70-75 degrees, an ignited burning pipe is vertically aligned to the connecting position of a nut and a bolt on the cast iron furnace mouth, the bolts of two cast iron plates of the cast iron furnace mouth on the iron adding side are fused, the converter is rocked to 90-110 degrees, the bolts of the two cast iron plates of the cast iron furnace mouth on the two sides of a trunnion are fused, the converter is rocked to 120-130 degrees, and the converter is heated to 90-110 degrees; fusing the bolts of the two cast iron plates at the cast iron furnace mouth on the tapping side; and (5) the bolts on the cast iron plate are knocked out from the bolt holes through a furnace dismantling machine drill rod, and the cast iron plate is dismantled through a furnace dismantling machine. According to the invention, the working intensity of personnel is reduced, and the safety risk of working is reduced. And the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a method for quickly disassembling a converter furnace mouth. Background Art

[0002] The converter body is generally composed of three parts: the furnace cap, the furnace shell and the furnace bottom. In order to facilitate the charging, oxygen lance insertion, furnace gas discharge and slag pouring during the operation of the converter, a circular furnace mouth is provided on the top of the furnace cap. During steelmaking, the temperature in the furnace is above 1 600°C. In order to extend the service life of the metal shell and lining of the furnace cap, a cast iron furnace mouth is generally used. Its advantages are to reduce the adhesive on the furnace mouth and make it easy to remove the adhesive. At the same time, it can strengthen the rigidity of the furnace mouth, reduce the deformation of the furnace mouth and extend the service life of the furnace mouth.

[0003] The converter mouth is usually assembled from six cast iron plates, each of which is fixed to the furnace shell by large bolts and replaced every furnace campaign. Due to the poor working conditions of the converter mouth, the bolts will be greatly deformed during the entire furnace campaign. When disassembling the furnace mouth, the bolts on the furnace mouth need to be removed. In the past, the bolts were removed by building a working platform on the top of the converter, and the workers went up to the working platform to work. The workers had a high workload and needed a truck crane to remove the cast iron furnace mouth. The work efficiency was low, and the poor working conditions of the workers also exacerbated the safety risks. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for quickly disassembling a converter mouth, thereby shortening the time for disassembling the mouth and improving work efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for quickly disassembling a converter furnace mouth, specifically comprising:

[0007] 1) Clean the slag on the surface of the cast iron furnace mouth to expose the nut on the cast iron furnace mouth;

[0008] 2) Fold the front end of the burning tube into a right angle, put a paper tube on the front end of the burning tube, and connect the rear end of the burning tube to the oxygen source;

[0009] 3) The converter is tilted to 90°-95° ​​in front of the furnace, the paper tube is ignited, oxygen is introduced into the burning tube, and the front end of the burning tube is ignited by the paper tube;

[0010] 4) First, swing the converter to a position of 70°-75°, align the ignited burning tube vertically with the connection position of the nut and bolt on the cast iron furnace mouth, melt the bolts of the two cast iron plates on the cast iron furnace mouth on the iron transfer side, adjust the converter angle, swing the converter to a position of 90°-110°, melt the bolts of the two cast iron plates on the cast iron furnace mouth on both sides of the trunnion, and then adjust the converter angle, swing the converter to a position of 120°-130°, and melt the bolts of the two cast iron plates on the cast iron furnace mouth on the steel discharge side;

[0011] 5) Use the furnace dismantling machine chisel to knock out the bolts on a cast iron plate from the bolt hole, insert the furnace dismantling machine chisel into a screw hole of the cast iron plate, and remove the cast iron plate. Repeat this process to remove all the remaining cast iron plates and complete the dismantling of the converter furnace mouth.

[0012] In step 2), the firing tube is folded into a right angle at a distance of 500-700 mm from the end.

[0013] When the paper tube is ignited in step 3), the oxygen flow rate introduced into the burning tube is 0.5-1.0Nm 3 / hour, oxygen pressure 0.6-0.8MPa.

[0014] When the bolt is melted in step 4), the initial oxygen flow rate is 2-5Nm 3 / hour, after the red slag is formed, adjust the oxygen flow rate to 6-10Nm 3 / hour, oxygen pressure 0.8-1.0MPa.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The method for disassembling the furnace mouth of the present invention does not require the construction of a platform, and the staff only needs to work on the converter platform, which reduces the work intensity of the staff and reduces the safety risk of the work. The work efficiency is greatly improved, and the time for disassembling the converter furnace mouth is shortened from more than 24 hours to less than 5 hours. DETAILED DESCRIPTION

[0017] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] A method for quickly disassembling a converter furnace mouth, specifically comprising:

[0019] 1) Clean the slag on the surface of the cast iron furnace mouth to expose the nut on the cast iron furnace mouth;

[0020] 2) Fold the front end of the burning tube into a right angle, put a paper tube on the front end of the burning tube, and connect the rear end of the burning tube to the oxygen source;

[0021] 3) The converter is tilted to 90°-95° ​​in front of the furnace, the paper tube is ignited, oxygen is introduced into the burning tube, and the front end of the burning tube is ignited by the paper tube;

[0022] 4) First, swing the converter to a position of 70°-75°. The staff stands on the converter platform and aligns the ignited burning tube vertically with the connection position of the nut and bolt on the cast iron furnace mouth. The bolts of the two cast iron plates on the cast iron furnace mouth on the iron transfer side are melted. The converter angle is adjusted and the converter is swing to a position of 90°-110°. The bolts of the two cast iron plates on the cast iron furnace mouth on both sides of the trunnion are melted. The converter angle is adjusted again and the converter is swing to a position of 120°-130°. The bolts of the two cast iron plates on the cast iron furnace mouth on the steel tapping side are melted.

[0023] 5) Use the furnace dismantling machine chisel to knock out the bolts on a cast iron plate from the bolt hole, insert the furnace dismantling machine chisel into a screw hole of the cast iron plate, and remove the cast iron plate. Repeat this process to remove all the remaining cast iron plates and complete the dismantling of the converter furnace mouth.

[0024] In step 2), the firing tube is folded into a right angle at a distance of 500-700 mm from the end.

[0025] When the paper tube is ignited in step 3), the oxygen flow rate introduced into the burning tube is 0.5-1.0Nm 3 / hour, oxygen pressure 0.6-0.8MPa.

[0026] When the bolt is melted in step 4), the initial oxygen flow rate is 2-5Nm 3 / hour, after the red slag is formed, adjust the oxygen flow rate to 6-10Nm 3 / hour, oxygen pressure 0.8-1.0MPa.

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Embodiment 1:

[0029] A factory's 260-ton converter needs annual maintenance and needs to replace the converter's cast iron furnace mouth. There are a total of 6 cast iron furnace mouths, each of which is fixed by 4 large bolts with a bolt diameter of 90mm.

[0030] 1) Prepare the conditions, dismantle the furnace, 10 2.5-meter-long oxygen tubes, oxygen point valve box, oxygen bags, and paper tubes.

[0031] 2) Before dismantling the converter mouth, use a furnace dismantling machine to clean the slag on the surface of the cast iron furnace mouth.

[0032] 3) Bend the oxygen tube into a right angle at 550mm from the end, put a paper tube on the front end of the tube, and connect the rear end of the tube to the oxygen bag; replace the tube if the front end of the tube is damaged.

[0033] 4) The converter is tilted to 90° in front of the furnace, the paper tube is ignited, oxygen is introduced into the burning tube, and the front end of the burning tube is ignited by the paper tube. The oxygen flow rate is 0.5Nm 3 / hour; oxygen pressure 0.6MPa.

[0034] 5) First, swing the converter to 70°. The staff stands on the converter platform and aligns the ignited burning tube vertically with the connection position of the nut and bolt on the cast iron furnace mouth. The bolts of the two cast iron plates on the cast iron furnace mouth on the iron transfer side are melted. Adjust the converter angle and swing the converter to 100°. The bolts of the two cast iron plates on the cast iron furnace mouth on both sides of the ear shaft are melted. Then adjust the converter angle and move the converter to 125°. The bolts of the two cast iron plates on the cast iron furnace mouth on the steel output side are melted. When the bolts are melted, the initial oxygen flow rate is 5Nm 3 / hour, after the red slag is formed, adjust the oxygen flow rate to 8Nm 3 / hour, oxygen pressure 0.8MPa.

[0035] 6) Use the furnace dismantling machine chisel to knock out the three bolts on a cast iron plate from the bolt holes. When the last bolt is left, pass the furnace dismantling machine chisel directly through the bolt hole, knock out the bolt and bring out the cast iron plate, remove the cast iron plate and place it on the converter platform; repeat this process to remove all the remaining cast iron plates and complete the dismantling of the converter furnace mouth.

[0036] Embodiment 2:

[0037] A factory's 200-ton converter needs annual maintenance and needs to replace the converter's cast iron furnace mouth. There are 6 cast iron furnace mouths in total, and each cast iron furnace mouth is fixed by 4 large bolts with a bolt diameter of 70mm.

[0038] 1) Prepare the conditions, dismantle the furnace, 10 2-meter-long oxygen tubes, oxygen point valve box, oxygen bags, and paper tubes.

[0039] 2) Before dismantling the converter mouth, use a furnace dismantling machine to clean the slag on the surface of the cast iron furnace mouth.

[0040] 3) Bend the oxygen tube into a right angle at 500mm from the end, put a paper tube on the front end of the tube, and connect the rear end of the tube to the oxygen bag; replace the tube if the front end of the tube is damaged.

[0041] 4) The converter is tilted to 95° in front of the furnace, the paper tube is ignited, oxygen is introduced into the burning tube, and the front end of the burning tube is ignited by the paper tube. The oxygen flow rate is 0.5Nm 3 / hour; oxygen pressure 0.6MPa.

[0042] 5) First, swing the converter to 80°. The staff stands on the converter platform and aligns the ignited burning tube vertically with the connection position of the nut and bolt on the cast iron furnace mouth. The bolts of the two cast iron plates on the cast iron furnace mouth on the iron transfer side are melted. Adjust the converter angle and swing the converter to 110°. The bolts of the two cast iron plates on the cast iron furnace mouth on both sides of the ear shaft are melted. Then adjust the converter angle and move the converter to 120°. The bolts of the two cast iron plates on the cast iron furnace mouth on the steel outlet side are melted. When the bolts are melted, the initial oxygen flow rate is 3Nm 3 / hour, after the red slag is formed, adjust the oxygen flow rate to 6Nm 3 / hour, oxygen pressure 1.0MPa.

[0043] 6) Use the furnace dismantling machine chisel to knock out the three bolts on a cast iron plate from the bolt holes. When the last bolt is left, pass the furnace dismantling machine chisel directly through the bolt hole, knock out the bolt and bring out the cast iron plate, remove the cast iron plate and place it on the converter platform; repeat this process to remove all the remaining cast iron plates and complete the dismantling of the converter furnace mouth.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for quickly disassembling a converter mouth, characterized in that: Specifically include: 1) Clean the slag on the surface of the cast iron furnace mouth to expose the nut on the cast iron furnace mouth; 2) Fold the front end of the burning tube into a right angle, put a paper tube on the front end of the burning tube, and connect the rear end of the burning tube to the oxygen source; 3) The converter is tilted to 90°-95° ​​in front of the furnace, the paper tube is ignited, oxygen is introduced into the burning tube, and the front end of the burning tube is ignited by the paper tube; 4) First, swing the converter to a position of 70°-75°, align the ignited burning tube vertically with the connection position of the nut and bolt on the cast iron furnace mouth, melt the bolts of the two cast iron plates on the cast iron furnace mouth on the iron transfer side, adjust the converter angle, swing the converter to a position of 90°-110°, melt the bolts of the two cast iron plates on the cast iron furnace mouth on both sides of the trunnion, and then adjust the converter angle, swing the converter to a position of 120°-130°, and melt the bolts of the two cast iron plates on the cast iron furnace mouth on the steel discharge side; 5) Use the furnace dismantling machine chisel to knock out the bolts on a cast iron plate from the bolt hole, insert the furnace dismantling machine chisel into a screw hole of the cast iron plate, and remove the cast iron plate. Repeat this process to remove all the remaining cast iron plates and complete the dismantling of the converter furnace mouth.

2. A method for quickly disassembling a converter mouth according to claim 1, characterized in that: In step 2), the firing tube is folded into a right angle at a distance of 500-700 mm from the end.

3. A method for quickly disassembling a converter mouth according to claim 1, characterized in that: When the paper tube is ignited in step 3), the oxygen flow rate introduced into the burning tube is 0.5-1.0Nm 3 / hour, oxygen pressure 0.6-0.8MPa.

4. A method for quickly disassembling a converter mouth according to claim 1, characterized in that: When the bolt is melted in step 4), the initial oxygen flow rate is 2-5Nm 3 / hour, after the red slag is formed, adjust the oxygen flow rate to 6-10Nm 3 / hour, oxygen pressure 0.8-1.0MPa.