Two-set new operation method for replacing tuyere of blast furnace

Abstract

The invention discloses a new operation method for replacing a tuyere second sleeve of a blast furnace, which comprises the following steps of: 1, preparing a tool car, and placing a large hook, a jack, a small hook, a steel chisel and a sledge hammer on the tool car; 2, 8-12 constructors are organized, and the constructors are divided into two groups, namely a replacement personnel group and a sealing removal group; step 3, making and arranging an overhaul progress in advance, and enabling constructors to grasp and memorize the working process and progress; fourthly, after backflow damping down of the blast furnace, the belly pipe and the three tuyeres are detached, and mud blocking is conducted on the front end; fifthly, a cavity formed after the tuyere is tightly plugged is tightly plugged through damping down mud, and coke is prevented from collapsing when the second sleeve is withdrawn; sixthly, the four ejector rods of the second set are detached, the sealing ring is cut off, and the baffle is detached; and 7, the second sleeve is ejected out through the thermal expansion and cold contraction effect by using a large hook and a jack. The invention relates to the field of blast furnace use, in particular to a two-set new operation method for blast furnace tuyere replacement.

Description

Technical Field

[0001] The invention relates to the field of blast furnace use, and in particular to a new operation method for replacing two sets of tuyere in a blast furnace. Background Art

[0002] As the core equipment of modern steelmaking, the stable operation of blast furnace is directly related to the efficiency and safety of ironmaking production. In the main structure of blast furnace, the tuyere device is the key transmission system connecting the hot air ring pipe and the furnace. The second set of tuyere is the core component of the device, which is subjected to the erosion of high-temperature molten iron, slag and 2000m 3 / min or more ultra-high hot air flow. This key component usually adopts a copper water-cooling structure design, with a high working environment temperature, and also needs to cope with the mechanical wear caused by the falling of raw materials in the furnace.

[0003] In the actual production process, due to thermal stress deformation, blockage of cooling water channels, shedding of refractory materials and other reasons, the second set of tuyere generally has problems such as front end burning, inner wall nodules, flange deformation, etc., with a short average service life, making it a key maintenance target for blast furnace shutdown and maintenance.

[0004] The traditional replacement process mainly adopts a combination of thermal cutting and mechanical vibration. The specific process includes: first, use oxygen to burn and cut the front end of the second set of tuyere in sections. Secondly, use vibration to remove the second set.

[0005] Single replacement is time-consuming, and more seriously, it will produce residues and residual iron, which are difficult to clean. The metal slag remaining inside the furnace body is easy to react chemically with the refractory material in the furnace to form a low-melting point eutectic, which reduces the service life of the ceramic cup in the furnace. And too much residue is not friendly to the environment. Summary of the invention

[0006] The core of the present invention is to improve replacement efficiency, reduce labor intensity and reduce environmental pollution.

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention is a new operation method for replacing two sets of tuyere in a blast furnace, comprising the following steps:

[0008] Step 1: Prepare a tool cart and place a large hook, a jack, a small hook, a steel chisel and a sledgehammer on the tool cart;

[0009] Step 2: Organize 8-12 construction workers and divide them into two groups, namely the replacement group and the sealing and removal group;

[0010] Step 3: Develop and arrange the maintenance schedule in advance, and the construction personnel must master and memorize the work process and schedule;

[0011] Step 4: After the blast furnace is shut down, remove the three sets of direct blowing pipes and tuyere, and block the front end with mud;

[0012] Step 5: Use the air stop mud to seal the hole behind the air vent to prevent the coke from collapsing when the second set is withdrawn;

[0013] Step 6: Remove the four ejector rods from the second set, cut off the sealing ring, and remove the baffle;

[0014] Step 7: Use a large hook and a jack to push out the second set through the effect of thermal expansion and contraction;

[0015] Step 8. After the second set is pulled out, clean the inside and check the contact surface of the large set to ensure that the new second set can be installed smoothly;

[0016] Step nine: Install the two new sets in place, ensuring they are tight. If necessary, apply windshield putty on the front outer edge.

[0017] Furthermore, the construction workers in step 2 must be professional users and must wear work clothes, safety helmets, work shoes, and work badges in accordance with regulations.

[0018] Furthermore, after the construction workers are required to memorize the content in step three, considering safety issues, professional personnel are required to conduct random inspections on the results of the construction workers' learning, and those who fail to meet the requirements cannot continue with the next work.

[0019] Furthermore, the step six also requires removing two sets of water inlet and outlet pipes and short pipes.

[0020] The beneficial effects achieved by the present invention using the above structure are as follows:

[0021] 1. During the regular maintenance and overhaul of the blast furnace, it is necessary to replace the damaged or deformed tuyere sets. This technology provides a more efficient and environmentally friendly way to perform this operation. All types of blast furnaces can adopt this method under the conditions, which means that this technology has a wide range of applicability.

[0022] 2. Although this technology is designed for the replacement of the second set of blast furnace tuyere, its core principles (such as utilizing the thermal expansion and contraction effects) may also be applicable to other industrial processes requiring similar operations.

[0023] In general, the application areas of this invention focus on improving the efficiency and safety of blast furnace operations while reducing the impact on the environment, which is very important for the ironmaking industry. DETAILED DESCRIPTION

[0024] Embodiment 1: The present invention is a new operation method for replacing two sets of tuyere in a blast furnace, comprising the following steps:

[0025] Step 1: Prepare a tool cart and put a large hook, jack, small hook, steel chisel and sledgehammer on the tool cart, as well as pipe clamps, manual hoists, wire ropes, half-moon plugging rakes, pneumatic picks, pneumatic pick chisels, oxygen tubes, leather hoses, fixtures, shovels, wind-blown mud, river sand, axial flow fans and other small tools;

[0026] Step 2: Organize 8 construction workers and divide them into two groups, namely the replacement group and the sealing removal group. The construction workers must be professional users and must wear work clothes, safety helmets, work shoes and work badges as required;

[0027] Step 3: Develop and arrange the maintenance schedule in advance, and require the construction personnel to master and memorize the work process and schedule. After the construction personnel memorize them, considering safety issues, professional personnel are required to conduct random inspections on the results of the construction personnel's learning. Those who fail to meet the standards cannot continue to work on the next step.

[0028] Step 4: After the backflow stops, remove the three sets of direct blowing pipes and tuyere, and block the mud at the front of the tuyere. Lift the three sets of direct blowing pipes and tuyere away from the tuyere area to create a spacious work site;

[0029] Step 5: Use the air stop mud to seal the empty space after removing the tuyere to prevent the coke from collapsing when the second set is withdrawn;

[0030] Step 6: Use a short flat steel chisel to remove the four push rods of the two sets. The gas welder uses a cutting gun to cut off the sealing rings of the two sets and remove the baffle of the air outlet push rod. The pipe fitter removes the inlet and outlet pipes and short pipes of the two sets.

[0031] Step 7: Extend the big hook into the second set of tuyere, hook the two sides of the two sets with the big hook, use the jack to tighten the connecting rod at the tail end of the big hook, and adjust the height, quickly pass water through the two sets of tuyere, and use the thermal expansion and contraction and expansion effect to push the two sets out;

[0032] Step 8. After the two sets are pulled out, use the wind hook to knock off the raised bricks inside, pad the embankment with refractory mud, clean it up, and check whether the contact surface of the large set is damaged, so as to facilitate the smooth installation of the two sets;

[0033] Step nine, use manual hoist and electric hoist to pull the new two sets into the big set, support the inlet and outlet pipes, use two small hooks to hit left and right at the same time, move the two sets into place, align and tighten to ensure tightness. If necessary, a circle of wind-proof mud can be applied on the outer edge of the front end of the two sets to prevent the slurry from flowing into the furnace during grouting.

[0034] Embodiment 2: The present invention is a new operation method for replacing two sets of tuyere in a blast furnace, comprising the following steps:

[0035] Step 1: Prepare a tool cart and put a large hook, jack, small hook, steel chisel and sledgehammer on the tool cart, as well as pipe clamps, manual hoists, wire ropes, half-moon plugging rakes, pneumatic picks, pneumatic pick chisels, oxygen tubes, leather hoses, fixtures, shovels, wind-blown mud, river sand, axial flow fans and other small tools;

[0036] Step 2: Organize 10 construction workers and divide them into two groups, namely the replacement group and the sealing removal group. The construction workers must be professional users and must wear work clothes, safety helmets, work shoes, and work badges as required;

[0037] Step 3: Develop and arrange the maintenance schedule in advance, and require the construction personnel to master and memorize the work process and schedule. After the construction personnel memorize them, considering safety issues, professional personnel are required to conduct random inspections on the results of the construction personnel's learning. Those who fail to meet the standards cannot continue to work on the next step.

[0038] Step 4: After the backflow stops, remove the three sets of direct blowing pipes and tuyere, and block the mud at the front of the tuyere. Lift the three sets of direct blowing pipes and tuyere away from the tuyere area to create a spacious work site;

[0039] Step 5: Use the air stop mud to seal the empty space after removing the tuyere to prevent the coke from collapsing when the second set is withdrawn;

[0040] Step 6: Use a short flat steel chisel to remove the four push rods of the two sets. The gas welder uses a cutting gun to cut off the sealing rings of the two sets and remove the baffle of the air outlet push rod. The pipe fitter removes the inlet and outlet pipes and short pipes of the two sets.

[0041] Step 7: Extend the big hook into the second set of tuyere, hook the two sides of the two sets with the big hook, use the jack to tighten the connecting rod at the tail end of the big hook, and adjust the height, quickly pass water through the two sets of tuyere, and use the thermal expansion and contraction and expansion effect to push the two sets out;

[0042] Step 8. After the two sets are pulled out, use the wind hook to knock off the raised bricks inside, pad the embankment with refractory mud, clean it up, and check whether the contact surface of the large set is damaged, so as to facilitate the smooth installation of the two sets;

[0043] Step nine, use manual hoist and electric hoist to pull the new two sets into the big set, support the inlet and outlet pipes, use two small hooks to hit left and right at the same time, move the two sets into place, align and tighten to ensure tightness. If necessary, a circle of wind-proof mud can be applied on the outer edge of the front end of the two sets to prevent the slurry from flowing into the furnace during grouting.

[0044] Embodiment 3: The present invention is a new operation method for replacing two sets of tuyere in a blast furnace, comprising the following steps:

[0045] Step 1: Prepare a tool cart and put a large hook, jack, small hook, steel chisel and sledgehammer on the tool cart, as well as pipe clamps, manual hoists, wire ropes, half-moon plugging rakes, pneumatic picks, pneumatic pick chisels, oxygen tubes, leather hoses, fixtures, shovels, wind-blown mud, river sand, axial flow fans and other small tools;

[0046] Step 2: Organize 12 construction workers and divide them into two groups, namely the replacement group and the sealing removal group. The construction workers must be professional users and must wear work clothes, safety helmets, work shoes, and work badges as required;

[0047] Step 3: Develop and arrange the maintenance schedule in advance, and require the construction personnel to master and memorize the work process and schedule. After the construction personnel memorize them, considering safety issues, professional personnel are required to conduct random inspections on the results of the construction personnel's learning. Those who fail to meet the standards cannot continue to work on the next step.

[0048] Step 4: After the backflow stops, remove the three sets of direct blowing pipes and tuyere, and block the mud at the front of the tuyere. Lift the three sets of direct blowing pipes and tuyere away from the tuyere area to create a spacious work site;

[0049] Step 5: Use the air stop mud to seal the empty space after removing the tuyere to prevent the coke from collapsing when the second set is withdrawn;

[0050] Step 6: Use a short flat steel chisel to remove the four push rods of the two sets. The gas welder uses a cutting gun to cut off the sealing rings of the two sets and remove the baffle of the air outlet push rod. The pipe fitter removes the inlet and outlet pipes and short pipes of the two sets.

[0051] Step 7: Extend the big hook into the second set of tuyere, hook the two sides of the two sets with the big hook, use the jack to tighten the connecting rod at the tail end of the big hook, and adjust the height, quickly pass water through the two sets of tuyere, and use the thermal expansion and contraction and expansion effect to push the two sets out;

[0052] Step 8. After the two sets are pulled out, use the wind hook to knock off the raised bricks inside, pad the embankment with refractory mud, clean it up, and check whether the contact surface of the large set is damaged, so as to facilitate the smooth installation of the two sets;

[0053] Step nine, use manual hoist and electric hoist to pull the new two sets into the big set, support the inlet and outlet pipes, use two small hooks to hit left and right at the same time, move the two sets into place, align and tighten to ensure tightness. If necessary, a circle of wind-proof mud can be applied on the outer edge of the front end of the two sets to prevent the slurry from flowing into the furnace during grouting.

[0054] The new method of replacing the second set shortens the working time of replacing the second set, reduces the labor intensity of employees, saves the recycling cost of the second set, and does not produce smoke and dust compared with the traditional oxygen burning second set, which is more environmentally friendly. The new method of replacing the second set can better meet the requirements of blast furnace production. It can be used in large and medium-sized blast furnaces under certain conditions.

[0055] These steps and measures together constitute the specific implementation method of the new replacement two-set operation method, which aims to improve replacement efficiency, reduce labor intensity, and reduce the impact on the environment.

[0056] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A new operation method for replacing two sets of tuyere in a blast furnace, characterized in that: The steps include: Step 1: Prepare a tool cart and place a large hook, a jack, a small hook, a steel chisel and a sledgehammer on the tool cart; Step 2: Organize 8-12 construction workers and divide them into two groups, namely the replacement group and the sealing and removal group; Step 3: Develop and arrange the maintenance schedule in advance, and the construction personnel must master and memorize the work process and schedule; Step 4: After the blast furnace is shut down, remove the three sets of direct blowing pipes and tuyere, and block the front end with mud; Step 5: Use the air stop mud to seal the hole behind the air vent to prevent the coke from collapsing when the second set is withdrawn; Step 6: Remove the four ejector rods from the second set, cut off the sealing ring, and remove the baffle; Step 7: Use a large hook and a jack to push out the second set through the effect of thermal expansion and contraction; Step 8. After the second set is pulled out, clean the inside and check the contact surface of the large set to ensure that the new second set can be installed smoothly; Step nine: Install the two new sets in place, ensuring they are tight. If necessary, apply windshield putty on the front outer edge.

2. The new operation method for replacing two sets of tuyere in a blast furnace according to claim 1 is characterized in that: The construction workers in step 2 must be professional users and must wear work clothes, safety helmets, work shoes and work badges in accordance with regulations.

3. The new operation method for replacing two sets of tuyere in a blast furnace according to claim 2 is characterized in that: After the construction workers are required to memorize the steps in step three, for safety reasons, professional personnel are required to conduct random inspections on the results of the construction workers' learning. Those who fail to meet the requirements will not be allowed to proceed to the next step.

4. The new operation method for replacing two sets of tuyere in a blast furnace according to claim 3 is characterized in that: The step six also requires removing the two sets of water inlet and outlet pipes and short pipes.