Rapid treatment method for blast furnace taphole tapping splashing
By cleaning and pouring grouting at the blast furnace iron mouth, pollution, equipment damage and safety hazards caused by iron splashing from the iron outlet are solved, and a rapid and thorough repair effect is achieved, reducing production risks.
Patent Information
- Application Number
- CN202310747743.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-25
- Publication Date
- 2025-01-03
AI Technical Summary
Splashing during the iron outlet of the blast furnace leads to product pollution, equipment damage and production safety hazards. The main reason is that there are gaps between the cooling wall and the furnace shell and the iron outlet area and good wind conditions lead to a developed airflow, and gas flow breaks the slag The air pressure in the iron is balanced, causing splashing.
After the blast furnace is resting, clean the residual slag iron and iron mouth combination bricks, install the iron mouth casing, and ensure the structural integrity and sealing of the iron mouth, and bake and maintain to restore the Iron mouth function.
By observing the combined bricks, removing loose bricks and pouring and grouting, the problem of iron mouth splashing is solved, the operation is simple and fast, and the repair time is controlled within 12 hours, which significantly improves production safety and efficiency.
Smart Images
Figure CN119242871A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of blast furnace ironmaking furnace front, in particular to a method for controlling splashing of iron from a blast furnace tapping hole. Background Art
[0002] The splashing during the tapping of the blast furnace iron mouth is serious, which poses a great threat to production and safety. It is specifically manifested in the following aspects: 1. The splashing phenomenon of iron at the tapping hole can easily cause pollution to the product. Moreover, due to the splashing phenomenon, some products are not collected as expected, which significantly affects the production efficiency; 2. The splashing of iron from the tap hole can easily damage the equipment before the iron making, shorten the life of the blast furnace, and cause safety hazards to the blast furnace production; 3. The splashing slag and iron can easily burn workers, posing a potential safety hazard. There are two main reasons for the serious splashing during the iron tapping at the blast furnace: First, there are gaps between the blast furnace cooling wall and the furnace shell, between the contact surface of the ring carbon and the cooling wall, and between the combined bricks through the iron mouth, which causes the coal gas to form a chaotic airflow in the gaps; Secondly, with the continuous growth of blast furnace service, the iron mouth area has been continuously eroded and lost its original structure due to good wind conditions. This leads to the development of airflow in the iron mouth area and gas cross-flow during the blast process, and the slag iron temperature is too high. The cross-flow gas is blown into the slag iron, breaking the air pressure balance in the slag iron, causing the iron mouth to splash; further, the iron mouth that has been eroded and lost its original structure has an uneven outlet structure, which further disrupts the flow state of the outlet slag iron, posing a great safety hazard. Therefore, it is necessary to use a quick treatment method to completely solve the problem of iron splashing at the blast furnace iron mouth. Summary of the invention
[0003] In response to the above-mentioned splashing phenomenon during iron tapping from the iron mouth of a blast furnace, the present invention provides a rapid treatment method for splashing during iron tapping from the iron mouth of a blast furnace, which is used to solve the hazards caused by splashing during iron tapping from the iron mouth.
[0004] Technical solution: A rapid treatment method for splashing of iron from the tap hole of a blast furnace, Step 1: Remove all the slag and iron before shutting down the blast furnace. After the slag and iron are removed, shut down the blast furnace. After shutting down the blast furnace, remove all the residual iron from the blast furnace ditch and cover the blast furnace ditch to ensure the safety of the construction workers. Step 2: Clean the residual slag, mud sleeve and taphole bricks in the taphole frame. During the cleaning process, pay attention to the taphole bricks to determine whether to remove them and the depth of removal. Build a passage along the original taphole and clean the residual slag and residual taphole mud bonded to the periphery of the passage wall. Clean the residual slag iron, mud sleeve and taphole bricks in the taphole frame. During the cleaning process, pay attention to the taphole bricks to determine whether to remove the taphole bricks and the removal depth of the taphole bricks. Build a passage along the original taphole and clean the residual slag iron and residual taphole mud adhered to the periphery of the passage wall deep into the original taphole. Step 3: After the iron mouth assembly bricks in step 2 are cleaned, the iron mouth is purged and cleaned to remove the residue and dust generated after cleaning the iron mouth assembly bricks; Step 4: Install the iron mouth sleeve on the inner wall of the iron mouth, so that the iron mouth and the iron mouth sleeve center line overlap, and weld and fix them; Step 5: pouring grouting to recreate the taphole; opening pouring holes above, below, on the left and on the right of the taphole, welding short pipes on the pouring holes and installing ball valves, connecting the ball valves with the pouring pipelines in turn and pouring grouting; the opening position is between the gaps of the two cooling walls; Step 6: After pouring and grouting, the remade iron mouth is baked and cured, and after completion, the re-airing and iron-tapping operation can be carried out.
[0005] Furthermore, the method for determining whether to demolish and the demolition depth described in step 2 includes that if the brickwork is loose and cracked, it needs to be demolished, and the depth of the loose and cracked brickwork determines the demolition depth.
[0006] Furthermore, the iron mouth casing described in step 4 is a steel pipe with a diameter of 108 mm.
[0007] Furthermore, the operation method for making the center line of the iron mouth and the iron mouth casing overlap in step 4 includes first adjusting the angle of the opening machine, installing the drill rod and inserting it into the iron mouth, and then installing the iron mouth casing on the inner wall of the iron mouth.
[0008] Furthermore, the step of opening pouring holes above, below, on the left and on the right of the iron mouth in step five specifically includes opening 4 pouring holes above and below the iron mouth, and opening 2 pouring holes on the left and on the right of the iron mouth.
[0009] Furthermore, the pouring and grouting process described in step five includes: 1) Clean the site and construction tools before construction; 2) The pouring slurry is stirred with a forced mixer for more than 5 minutes until the pouring slurry is stirred evenly; 3) Through the pouring hole, quickly pour the iron outlet area until no more can be added, so as to ensure that the castable fits tightly with the original top refractory material of the iron outlet area to be repaired.
[0010] Furthermore, during the rapid pouring, a vibrating rod is used to perform auxiliary vibration construction.
[0011] Furthermore, the steps of the rapid pouring operation are: a) Lubricate the casting pipeline with bonding resin; b) Press the slurry to the outlet of the casting pipeline to drain the binding resin of the lubricating pipe; c) Connect the pipeline through the quick connector, open the ball valve and press in. The pouring order of the pouring holes is to press the lower pouring hole first, then the left and right pouring holes, and finally the upper pouring hole. When one pouring hole is pressed in, the surrounding pouring holes should be closed. The pressing amount is controlled by pressure, and the pressing pressure limit is 0.6Mpa.
[0012] Furthermore, the step six of baking and curing the reconstructed iron mouth comprises: baking the iron mouth guard plate outside the iron mouth guard plate at a temperature range of 80°C-150°C for 1 hour; after the pouring slurry is completely hardened, cutting off the excess part of the iron mouth casing outside, and repairing the pouring hole by welding; after the treatment is completed, baking the iron mouth guard plate at a temperature range of 200°C-300°C for 0.5 hour.
[0013] Beneficial effects: Due to the adoption of the above technical scheme, the present invention has the following advantages: the present invention determines whether to remove and the removal depth based on the observation of the taphole composite bricks, removes the loose taphole composite bricks, and performs pouring and grouting operations to completely solve the problem of iron splashing at the taphole of the blast furnace; the present invention has simple operating steps, is convenient and fast, and not only that, the entire repair time is controlled within 12 hours. Compared with the prior art in which only grouting and grouting operations are performed, the repair operation period is long and the repair is incomplete, the present invention has obvious advantages. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a flow chart of a rapid treatment method for iron splashing from the blast furnace tapping hole. DETAILED DESCRIPTION
[0015] Example The present invention provides a rapid processing method for quickly solving the problem of iron splashing at the iron mouth of a blast furnace caused by air leakage at the iron mouth and loss of the original structure of the iron mouth due to erosion, which specifically comprises the following steps: Step 1: Remove all slag and iron before shutting down the blast furnace. After the slag and iron are removed, shut down the blast furnace. After shutting down the blast furnace, remove all residual iron from the blast furnace ditch and cover the blast furnace ditch to ensure the safety of the construction workers. Step 2: Remove the steel plate of the iron mouth frame of the blast furnace shell, use a pneumatic pick and iron bar to clean the residual slag, mud sleeve and iron mouth composite bricks in the iron mouth frame, observe the iron mouth composite bricks during the cleaning process, loose brickwork and cracked brickwork need to be removed, the depth of loose and cracked brickwork determines the removal depth, and the method for judging loose and cracked composite bricks is: a) touch with an iron bar and observe whether it shakes, if it shakes, it will be removed; b) observe whether there are cracks on the surface of the composite bricks, if there are cracks, it will be removed. The cleaning depth in this embodiment is 25 cm. In addition to cleaning brickwork, build a passage along the original iron mouth, and clean the residual slag and residual gun mud bonded to the periphery of the passage wall deep into the passage.
[0016] Step 3: After the cleaning is completed, use compressed air to blow and clean the iron mouth to remove the residue and dust. After cleaning, weld a steel guard plate at the location where the steel plate was removed. The steel guard plate should be the same size as the removed steel plate.
[0017] Step 4: Install the iron mouth sleeve on the inner wall of the iron mouth. The iron mouth sleeve is a steel pipe with an outer diameter of 108mm. The outer diameter of the iron mouth sleeve is the same as the inner diameter of the blast furnace iron mouth. Since the combined bricks were removed in step 2, the center line of the iron mouth does not coincide with the center line of the iron mouth sleeve inserted therein. During installation, in order to overlap the center lines of the iron mouth and the iron mouth sleeve, first adjust the angle of the opening machine, install the drill rod and insert it into the iron mouth, and then install the iron mouth sleeve on the inner wall of the iron mouth. At this time, the center lines of the iron mouth and the iron mouth sleeve overlap. In order to better fix the iron mouth sleeve, the iron mouth sleeve is welded and fixed to the steel guard plate. The iron mouth sleeve plays a role in protecting the iron mouth from being blocked by the pouring slurry and protecting the iron outlet.
[0018] Step 5: Open 4 pouring holes above and below the tap hole, and 2 pouring holes on the left and right sides of the tap hole. The openings are located outside the steel guard plate and between the gaps between the cooling walls. Avoid the furnace shell welding seams when opening the holes to prevent the risk of loose interfaces for subsequent grouting operations. Weld short pipes on the pouring holes and install ball valves. At this point, the operation on the blast furnace is ready.
[0019] The preparation steps for pouring grouting include: 1) Clean the site and construction tools before construction to prevent impurities in the construction environment from contaminating the slurry. The pouring slurry is a viscous blast furnace pouring slurry with explosion-proof and good thermal stability.
[0020] 2) The pouring slurry is stirred by a forced mixer. No impurities should be mixed during stirring to avoid affecting the pouring effect and performance. The stirring time should be more than 5 minutes until the pouring slurry is stirred evenly to ensure that the pouring conditions of the pouring slurry are consistent during the grouting process and after the grouting is completed; 3) After the pouring slurry is prepared, lubricate the pouring pipeline with binding resin, and then press the pouring slurry from the pouring pipeline inlet to the pouring pipeline outlet to drain the binding resin that lubricates the pipe; connect the ball valve to the pouring pipeline through a quick connector and pour and slurry. The specific steps are to open the ball valve for pressing in. The pouring order of the pouring holes is to press the lower pouring hole first, then the left and right pouring holes, and finally the upper pouring hole; when a pouring hole is pressed in, the surrounding pouring holes should be closed; the pressing amount is controlled by pressure, and the pressing pressure limit is 0.6Mpa. In order to ensure better density of the pouring, a vibrating rod can be used for auxiliary vibration construction; pour until no more material can be added; thereby ensuring that the castable fits tightly with the original top refractory material in the iron mouth area to be repaired.
[0021] During the pouring process, in order to reduce the pressure loss during the grouting process, ensure that the grouting area is filled solidly, and avoid wind leakage again, the grouting equipment has the following requirements: a. Ensure that there is sufficient raw material in the silo and tank of the grouting equipment; b. The pouring pipeline should be straight to avoid local bending, which may cause insufficient pressure during the grouting process and fail to fully compact the entire area to be filled, and minimize the pressure loss along the pipeline; c. The joints of each connected pouring pipeline must be tight. Loose joints not only affect the injection pressure but also easily lead to unhooking and pouring pipeline collapse accidents; d. The hose connection is mainly adopted to ensure that the pipe diameter remains basically unchanged and the material is unobstructed; eAvoid high temperature sources.
[0022] Step 6: After the pouring and grouting is completed, the rebuilt iron mouth is baked and cured, and the re-airing and iron-tapping operation can be carried out after completion. Specifically, after the pouring and grouting is completed, the iron mouth guard plate is baked for 1 hour at a temperature range of 80℃-150℃ outside the iron mouth guard plate; after the pouring slurry is completely hardened, the excess part of the iron mouth casing is cut off, and the pouring hole is repaired and welded to restore; after the treatment is completed, the iron mouth guard plate is baked for 0.5 hours at a temperature range of 200℃-300℃ to complete the baking and curing of the rebuilt iron mouth.
[0023] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.
Claims
1. A method for rapidly treating splashing of iron from a blast furnace tap hole, characterized in that: Step 1: Remove all the slag and iron before shutting down the blast furnace. After the slag and iron are removed, shut down the blast furnace. After shutting down the blast furnace, drain all the residual iron from the blast furnace tapping channel and cover the blast furnace tapping channel to ensure the safety of the construction workers. Step 2: Remove the steel plate of the iron mouth frame of the blast furnace shell, clean the residual slag, mud sleeve and the iron mouth composite bricks in the iron mouth frame, observe the iron mouth composite bricks during the cleaning process, determine the iron mouth composite bricks that need to be removed and the removal depth of the above iron mouth composite bricks, build a passage along the original iron mouth, and clean the residual slag and residual taphole mud bonded to the periphery of the passage wall deep into the original iron mouth; Step 3: After the iron mouth assembly bricks in step 2 are cleaned, the iron mouth is purged and cleaned, and the residue and dust generated after cleaning the iron mouth assembly bricks are removed; after cleaning, a steel guard plate is welded at the location where the steel plate is removed, and the steel guard plate is the same size as the removed steel plate; Step 4: Install the iron mouth sleeve on the inner wall of the iron mouth so that the iron mouth and the iron mouth sleeve center line overlap, and weld the iron mouth sleeve to the steel guard plate in step 3; Step 5: pouring grouting to reconstruct the taphole; opening pouring holes above, below, on the left and on the right of the taphole, welding short pipes on the pouring holes and installing ball valves, connecting the ball valves with the pouring pipelines in turn and pouring grouting; the opening positions of the pouring holes are outside the steel guard plate and between the gaps between the cooling walls; Step 6: After pouring and grouting, the remade iron mouth is baked and cured, and after completion, the re-airing and iron-tapping operation can be carried out.
2. A method for rapidly treating splashing of blast furnace tapping according to claim 1, characterized in that: The method for determining the iron mouth composite bricks that need to be removed and the removal depth of the iron mouth composite bricks described in step 2 includes that if the brickwork is loose and cracked, it needs to be removed, and the depth of the loose and cracked brickwork determines the removal depth; the method for judging the composite bricks with loose and cracked brickwork is: a) touch with an iron rod and observe whether it shakes, if it shakes, it will be removed; b) observe whether there are cracks on the surface of the composite brick, if there are cracks, it will be removed.
3. A method for rapidly treating splashing of blast furnace tapping according to claim 1, characterized in that: The operation method for making the center lines of the iron mouth and the iron mouth casing overlap in step 4 includes first adjusting the angle of the opening machine, inserting the drill rod into the iron mouth after installing it, and then installing the iron mouth casing on the inner wall of the iron mouth.
4. The method for rapidly treating the splashing of iron from the tap hole of a blast furnace according to claim 1, characterized in that: The iron mouth casing described in step 4 is a steel pipe whose outer diameter is the same as the iron mouth inner diameter.
5. The method for rapidly treating the splashing of iron from the tap hole of a blast furnace according to claim 1, characterized in that: The step 5 of opening pouring holes above, below, on the left and on the right of the iron mouth specifically includes opening 4 pouring holes above and below the iron mouth, and opening 2 pouring holes on the left and on the right of the iron mouth.
6. A method for rapidly treating splashing of blast furnace tapping iron according to claim 1, characterized in that: The pouring and grouting process described in step 5 includes: 1) Clean the site and construction tools before construction; 2) The pouring slurry is stirred with a forced mixer for more than 5 minutes until the pouring slurry is stirred evenly; 3) Rapidly pour the taphole through the pouring hole until no more can be added; thus ensuring that the castable fits tightly with the original top refractory material in the taphole area to be repaired.
7. A method for rapidly treating splashing of blast furnace tapping according to claim 6, characterized in that: During the rapid pouring, a vibrating rod is used to perform auxiliary vibration construction.
8. A method for rapidly treating splashing of blast furnace tapping iron according to claim 6, characterized in that: The steps of the rapid pouring operation are: a) Lubricate the casting pipeline with bonding resin; b) Press the slurry to the outlet of the casting pipeline to drain the binding resin of the lubricating pipe; c) Connect the pipeline through the quick connector, open the ball valve and press in. The pouring order of the pouring holes is to press the lower pouring hole first, then the left and right pouring holes, and finally the upper pouring hole. When one pouring hole is pressed in, the surrounding pouring holes should be closed. The pressing amount is controlled by pressure, and the pressing pressure limit is 0.6Mpa.
9. A method for rapidly treating splashing of blast furnace tapping iron according to claim 6, characterized in that: The steps of baking and curing the reconstructed iron mouth as described in step six include: baking the iron mouth guard plate outside the iron mouth guard plate at a temperature range of 80℃-150℃ for 1h; after the pouring slurry is completely hardened, cutting off the excess part of the iron mouth casing outside and repairing the pouring hole by welding; after the treatment is completed, baking the iron mouth guard plate at a temperature range of 200℃-300℃ for 0.5h.