A construction method for partial replacement of checker bricks in a hot blast stove

Abstract

The present invention relates to a construction method for partial replacement of checker bricks in a hot blast stove, including: Step 1, opening a discharging hole. According to the production status of the hot blast stove, determine the replacement range of the checker bricks, open a discharging hole at a preset position, and demolish the refractories to completely expose the checker bricks; Step 2, demolishing the old checker bricks. According to the demolition height of the checker bricks, determine the amount of materials to be discharged through the upper manhole or the baking furnace manhole. Demolish the checker bricks downward from the orientation of the discharging hole until the discharging hole is exposed, and further demolish the checker bricks in other orientations; Step 3, fabricating a closed chute. Fabricate a closed chute according to the height inside the furnace and the size of the checker bricks. The laying of the closed chute is from the upper manhole or the baking furnace manhole to the construction surface inside the furnace; Step 4, laying new checker bricks; Step 5, restoring the wall and demolishing the closed chute. The advantages of the present invention are reducing the opening of the furnace shell during the construction process, thereby reducing the potential hazards caused by the opening, improving the operation efficiency, greatly reducing the construction period, and lowering the construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of refractory maintenance construction of a hot blast stove body, and particularly to a construction method for replacing part of the checker bricks of a hot blast stove. Background Art

[0002] At present, checker bricks are heat-carrying and heat-storing bodies with many excellent thermal engineering characteristics such as strong heat exchange ability, large heat storage area, smooth air passage, and small resistance, which are widely recognized and accepted in the world's iron-smelting industry. Checker bricks are a heat transfer medium, mainly used in the upper and middle parts of the regenerator of a hot blast stove to play a heat storage role. They play an extremely important role in the process of heating cold air into hot air. However, as the service time of the hot blast stove increases, the checker bricks will also be damaged and need to be replaced. The traditional replacement method is to open multiple discharge holes for removing the old bricks and installing the new bricks. On the one hand, it increases the workload, and on the other hand, multiple openings are not conducive to the firmness of the wall body. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a construction method for replacing part of the checker bricks of a hot blast stove, including:

[0004] Step 1: Open a discharge hole. According to the production status of the hot blast stove, determine the replacement range of the checker bricks, open a discharge hole at a preset position, and remove the refractory to completely expose the checker bricks;

[0005] Step 2: Remove the old checker bricks. According to the removal height of the checker bricks, determine the amount of material to be discharged through the upper manhole or the baking furnace manhole. Discharge the checker bricks downward from the orientation of the discharge hole until the discharge hole is exposed, and further remove the checker bricks in other orientations;

[0006] Step 3: Make a closed chute. Make a closed chute according to the height inside the furnace and the size of the checker bricks. The laying of the closed chute is from the upper manhole or the baking furnace manhole to the construction surface inside the furnace;

[0007] Step 4: Lay the new checker bricks. A deceleration device is made of rubber at the end of the closed chute to slow down the falling speed of the checker bricks. Lay rubber at the landing point of the checker bricks to ensure that the checker bricks are not damaged, and at the same time, lay the new checker bricks;

[0008] Step 5: Restore the wall and remove the closed chute. While restoring the checker bricks, restore the wall body of the originally opened discharge hole. After the wall body restoration is completed, weld and restore the furnace shell. According to the laying height of the checker bricks, the chute is gradually removed in sections until all the checker bricks are laid.

[0009] Preferably, in the first step, the preset position of the discharge hole is 1-3 m above the brick-changing interface of the checker bricks.

[0010] Preferably, the opening diameter of the discharge hole is 690-710 mm.

[0011] Preferably, before opening the discharge hole, cool down the hot blast stove, confirm that the temperature, gas concentration, and oxygen concentration inside the furnace are within the safe range, and enter the furnace for inspection to determine the discharge hole.

[0012] Preferably, before entering the furnace for inspection, check the refractories on the upper part of the hot blast stove to ensure the safety of the upper part.

[0013] Preferably, one discharge hole is provided.

[0014] Preferably, in the second step, after the discharge port is exposed, take protective measures on the surrounding wall of the discharge port to prevent damage to the original large wall when discarding the old checker bricks.

[0015] Preferably, in the second step, when removing the old checker bricks, the checker bricks at a height of 1 - 3 m below the discharge hole are removed and sent out of the furnace through the discharge hole by manual transfer.

[0016] Preferably, in the second step, after the removal of the old checker bricks is completed, clean up the residue, check the exposed wall, and repair the damaged parts.

[0017] Preferably, in the second step, according to the removal height of the old checker bricks, determine the amount of material to be discharged through the upper manhole or the drying furnace manhole.

[0018] In summary, the beneficial technical effects of the present invention are as follows: The present invention is a construction method for replacing some checker bricks inside the hot blast stove during maintenance. This construction method can reduce the opening of the furnace shell during the construction process, thereby reducing the potential hazards caused by the opening, improving the operation efficiency, greatly reducing the construction period, and reducing the construction cost; The present invention provides a reliable checker brick replacement construction technology for the maintenance construction of such hot blast stoves, enabling the smooth progress of this operation content. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other object features, characteristics, and advantages of the present invention will become clearer. The drawings are only for the purpose of showing the preferred embodiments and are not considered as limiting the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0020] Figure 1 It is a schematic diagram of the steps of the construction method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings. Although the accompanying drawings show exemplary embodiments of the present disclosure, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully communicated to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0022] Referring to Figure 1 As shown, a construction method for partial replacement of checker bricks in a hot blast stove disclosed by the present invention includes: Step 1, opening a discharging hole. According to the production status of the hot blast stove, determine the replacement range of the checker bricks, open a discharging hole at a preset position, and remove the refractories to completely expose the checker bricks; Step 2, removing the old checker bricks. According to the height of the removed checker bricks, determine the amount of materials to be discharged through the upper manhole or the drying furnace manhole. Remove the checker bricks downward from the orientation of the discharging hole until the discharging hole is exposed, and further remove the checker bricks in other orientations; Step 3, manufacturing a closed chute. Manufacture a closed chute according to the height inside the furnace and the size of the checker bricks. The laying of the closed chute is from the upper manhole or the drying furnace manhole to the construction surface inside the furnace; Step 4, laying new checker bricks. A deceleration device is made of rubber at the end of the closed chute to slow down the falling speed of the checker bricks. Lay rubber at the falling point of the checker bricks to ensure that the checker bricks are not damaged, and at the same time lay the new checker bricks; Step 5, restoring the wall and removing the closed chute. While restoring the laying of the checker bricks, restore the wall of the originally opened discharging hole. After the wall restoration is completed, weld and restore the furnace shell. According to the laying height of the checker bricks, the chute is gradually removed in sections until all the checker bricks are laid.

[0023] In this embodiment, in Step 1, the preset position of the discharging hole is 1-3 m above the checker brick replacement interface.

[0024] In this embodiment, the opening diameter of the discharging hole is 690-710 mm.

[0025] In this embodiment, before opening the discharging hole, cool down the hot blast stove, confirm that the temperature, gas concentration, and oxygen concentration inside the furnace are within the safe range, and enter the furnace for investigation to determine the discharging hole.

[0026] In this embodiment, before entering the furnace for investigation, check the refractories on the upper part of the hot blast stove to ensure the safety of the upper part.

[0027] In this embodiment, one discharging hole is provided.

[0028] In this embodiment, in Step 2, after the discharging port is exposed, take protective measures on the surrounding wall of the discharging port to prevent damage to the original large wall when discarding the old checker bricks.

[0029] In this embodiment, in step 2, when demolishing the old checker bricks, the checker bricks at a height of 1 - 3 m below the discharge hole are demolished and sent outside the furnace through the discharge hole by manual transfer.

[0030] In this embodiment, in step 2, after the demolition of the old checker bricks is completed, the residue is cleaned up, the exposed wall is inspected, and the damaged parts are repaired.

[0031] In this embodiment, in step 2, according to the demolition height of the old checker bricks, the amount of material to be discharged through the upper manhole or the baking furnace manhole is determined.

[0032] The most preferred embodiment of the construction method for partial replacement of the checker bricks of the hot blast stove of the present invention is as follows:

[0033] According to the production status of the hot blast stove, determine the replacement range of the checker bricks;

[0034] According to the on-site investigation, select the direction that is conducive to the discharge and transportation of waste refractories, and open a φ700 mm discharge hole at a position about 1 - 3 m above the checker brick replacement interface (determined according to the demolition height of the checker bricks).

[0035] After the discharge hole is opened, demolish the refractory wall at this place until the checker bricks are completely exposed.

[0036] After the hot blast stove is cooled down, confirm that the temperature, gas concentration, and oxygen concentration in the furnace are within the safe range, and then enter the furnace for investigation.

[0037] Before the investigation, it is necessary to check the refractory situation on the upper part of the hot blast stove to ensure the safety of the upper part.

[0038] According to the principle of facilitating discharge or feeding based on the on-site investigation, select the upper manhole or the baking furnace manhole of the hot blast stove body as the channel for material entry and exit.

[0039] During demolition, according to the demolition height of the checker bricks, determine the amount of material to be discharged through the upper manhole or the baking furnace manhole.

[0040] At the same time, demolish the checker bricks downward in the direction where the discharge hole is opened until the opened discharge hole is exposed.

[0041] After the discharge hole is exposed, take protective measures on the surrounding wall of the discharge hole to prevent damage to the original large wall when discarding the checker bricks.

[0042] Demolish the checker bricks in other directions and throw them into the discharge hole to be discharged outside the furnace until the area below the discharge hole is reached.

[0043] The checker bricks at a height of about 1 - 3 m below the discharge hole are demolished and sent outside the furnace through the discharge hole by manual transfer.

[0044] The removal of the checker bricks in the furnace is completed, and the residues are cleaned up. Then, the exposed wall is inspected. If there are any damaged parts that need to be repaired, they are repaired.

[0045] A closed chute is fabricated according to the height inside the furnace and the size of the checker bricks. The checker bricks are transferred into the furnace through the upper manhole or the baking furnace manhole and transported to the construction surface inside the furnace through the chute.

[0046] A deceleration device is made of rubber at the end of the chute to slow down the speed of the checker bricks at the outlet. Rubber sheets are laid at the landing points of the checker bricks to reduce the impact force and ensure that the checker bricks are not damaged; Rubber safety

[0047] While the checker bricks are being reinstalled, the wall of the original discharge hole is restored. After the wall restoration is completed, the furnace shell is welded and restored.

[0048] According to the height of the checker brick masonry, the chute is gradually removed in sections until all the checker bricks are completely masoned.

[0049] In summary, the beneficial technical effects of the present invention are as follows: This invention patent is a construction method for replacing some of the checker bricks inside the main body during the overhaul of the hot blast stove. This construction method removes the old checker bricks by setting a discharge hole and feeds the new checker bricks through a closed chute, which can reduce the number of openings in the furnace shell during the construction process, thereby reducing the potential hazards caused by the openings, improving the operation efficiency, greatly reducing the construction period, and lowering the construction cost; This invention patent provides a reliable checker brick replacement construction technology for the overhaul construction of such hot blast stoves, enabling this operation content to proceed smoothly.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0051] Finally, it should be noted that: Obviously, the above embodiments are merely examples given to clearly illustrate the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A construction method for partial replacement of checker bricks in a hot blast stove, characterized in that, Including: Step 1: Open a discharging hole. According to the production status of the hot blast stove, determine the replacement range of the checker bricks, open a discharging hole at the preset position, and remove the refractories to completely expose the checker bricks. Step 2: Remove the old checker bricks. According to the removal height of the checker bricks, determine the amount of materials to be discharged through the upper manhole or the baking furnace manhole. Remove the checker bricks downward in the direction of the discharging hole until the discharging hole is exposed, and then further remove the checker bricks in other directions. When removing the old checker bricks, for the checker bricks at a height of 1 - 3 m below the discharging hole, they are removed manually and sent out of the furnace through the discharging hole. In the said Step 2, after the removal of the old checker bricks is completed, clean up the residues and inspect the exposed wall, and repair the damaged parts. Step 3: Fabricate a closed chute. Fabricate a closed chute according to the height inside the furnace and the size of the checker bricks. The laying of the closed chute is from the upper manhole or the baking furnace manhole to the construction surface inside the furnace. Step 4: Lay the new checker bricks. Use rubber to make a deceleration device at the end of the closed chute to slow down the falling speed of the checker bricks. Lay rubber at the landing point of the checker bricks to ensure that the checker bricks are not damaged, and at the same time lay the new checker bricks. Step 5: Restore the wall and remove the closed chute. While restoring the laying of the checker bricks, restore the wall of the originally opened discharging hole. After the wall restoration is completed, weld and restore the furnace shell. According to the laying height of the checker bricks, the chute is gradually removed in sections until all the checker bricks are laid.

2. The construction method for partial replacement of the checker bricks in the hot blast stove according to claim 1, characterized in that, In the said Step 1, the preset position of the discharging hole is 1 - 3 m above the checker brick replacement interface.

3. The construction method for partial replacement of the checker bricks in the hot blast stove according to claim 1 is characterized in that, The opening diameter of the discharging hole is 690 - 710 mm.

4. The construction method for partial replacement of the checker bricks in the hot blast stove according to claim 1, characterized in that, Before opening the discharging hole, cool down the hot blast stove, confirm that the temperature, gas concentration, and oxygen concentration inside the furnace are within the safe range, and enter the furnace for investigation to determine the discharging hole.

5. The construction method for partial replacement of checker bricks in a hot blast stove according to claim 4, characterized in that, Before entering the furnace for investigation, check the refractories on the upper part of the hot blast stove to ensure the safety of the upper part.

6. The construction method for partial replacement of the checker bricks of the hot blast stove according to claim 1, characterized in that, One discharging hole is set.

7. The construction method for partial replacement of the checker bricks in the hot blast stove according to claim 1, characterized in that, In the said Step 2, after the discharging hole is exposed, take protective measures on the surrounding wall of the discharging hole to prevent damage to the original large wall when discarding the old checker bricks.

8. The construction method for partial replacement of the checker bricks of the hot blast stove according to claim 1, characterized in that, In the said Step 2, according to the removal height of the old checker bricks, determine the amount of materials to be discharged through the upper manhole or the baking furnace manhole.

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