Dynamic dustproof construction method in coke oven combustion chamber building process

Abstract

The invention relates to the technical field of methods special for coke oven masonry, in particular to a dynamic dustproof construction method in a coke oven combustion chamber masonry process, which comprises the following steps: arranging a first flexible isolation layer; a protection device is installed in the combustion chamber, the position of the protection device is periodically adjusted along with the laying progress, the protection device is removed after laying is conducted to a third height, the first flexible isolation layer is broken after being cleaned, and a second flexible isolation layer is laid; after the combustion chamber overhead building is completed, dust on the second flexible isolation layer is cleared and then broken, and a top opening of the combustion chamber is subjected to top sealing protection; in the follow-up masonry process, top sealing protection is updated regularly till masonry is completed; according to the method, dynamic segmented protection is achieved, whole-course dust prevention is achieved by laying the flexible isolation layer in stages and dynamically adjusting the protection device, and a cleaning blind area of one-time protection in a traditional method is avoided. The protection device does not need to be disassembled and assembled repeatedly along with improvement of the masonry progress, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of special methods for coke oven masonry, and specifically to a dynamic dust prevention construction method during the masonry of a coke oven combustion chamber. Background Art

[0002] With the development of modern coke ovens towards large-scale, high-efficiency, green and environmental protection, significant changes have taken place in the coke oven masonry construction process; the traditional construction method is to first complete the masonry of the combustion chamber body and clean it, and then carry out the masonry of the regenerator checker bricks and the sealing wall; however, to improve construction efficiency, reduce material use and shorten the construction period, modern processes have begun to adopt the method of alternately laying checker bricks and the combustion chamber wall; during the masonry process, the mortar in the brick joints is easily extruded and dropped, and at the same time, dust may remain on the surface of the bricks. If not cleaned in time, these impurities will: block the inclined ports, affecting the later circulation of gas and air; fall into the holes of the regenerator checker bricks, reducing the heat exchange efficiency.

[0003] At present, the common dust prevention methods during masonry mainly include the following two categories, but both have obvious drawbacks: The first category, fixed protection plates and woven bags for dust prevention: For example, in a cleaning and protection method during the masonry of the upper part of the inclined channels of a large coke oven with the publication number CN103509565B, a mud-receiving woven bag and a fixed protection plate are arranged at the bottom of the combustion chamber. During masonry, a movable protection plate is used, and the protection structure is removed before overtopping, and finally a vacuum cleaner is used for cleaning. This method has the following drawbacks: 1) The movable protection plate relies on the steel bars in the brick joints for support, resulting in incomplete mortar at the support part, affecting the masonry quality; 2) Cleaning needs to be carried out after the combustion chamber is overtopped, with a large construction height (such as more than 6 meters), difficult operation and low efficiency; 3) The regulating bricks at the inclined ports must be installed after the masonry of the coke oven body is completed, increasing the risk of blockage and the construction difficulty. The second category, multi-layer polyethylene film covering for dust prevention: For example, in a masonry structure and construction method of a coke oven assisted by polyethylene film with the publication number CN111718732B, several transverse refractory brick walls are arranged in the coke oven combustion chamber, dividing the coke oven combustion chamber into several combustion chamber units, and several layers of polyethylene film layers are arranged from bottom to top in the combustion chamber. This method has the following drawbacks: 1) After the film is laid, the mud extruded below cannot be cleaned, and it may degrade at high temperatures, and the remaining mud falls into the regenerator, polluting the checker bricks and possibly blocking the inclined channels after accumulation; 2) The process of first laying the transverse walls easily leads to incomplete mortar in the vertical joints, increasing the risk of leakage. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a dynamic dust prevention construction method during the masonry of a coke oven combustion chamber that can achieve efficient dust prevention and convenient cleaning while ensuring the masonry quality.

[0005] The technical solution adopted by the present invention to solve its technical problems is: A dynamic dust-proof construction method during the masonry process of a coke oven combustion chamber, comprising the following steps: S1, the first protection stage: after the combustion chamber wall is masoned to a preset first height, lay a first flexible isolation layer on the top surface of the wall; S2, the second protection stage: continue to mason upwards to a preset second height, install a protection device inside the combustion chamber, and the protection device is arranged on the structural support surface inside the combustion chamber; S3, the dynamic protection stage: periodically adjust the position of the protection device along with the masonry progress, and when masoned to a preset third height, clean the dust on the first flexible isolation layer and then pierce it, and lay a second flexible isolation layer; remove the protection device when masoning the upper layer of the overhead masonry; S4, the final sealing stage: after the overhead masonry of the combustion chamber is completed, clean the dust on the second flexible isolation layer and then pierce it, and conduct top sealing protection on the top opening of the combustion chamber; S5, the continuous maintenance stage: during the subsequent masonry process, regularly update the top sealing protection until the masonry is completed.

[0006] As a preference, a further technical solution of the present invention is: Preferably, both the first flexible isolation layer and the second flexible isolation layer are made of polyethylene film, and the size is made according to the cross-sectional size of the combustion chamber vertical flue. When laying, the polyethylene film covers the cross-section of the vertical flue and extends 20 - 40 mm towards the top surface of the wall, and is fixed by an adhesive.

[0007] Preferably, the polyethylene film covers the brick surface ≥25 mm in the direction of the combustion chamber wall, and covers the brick surface 30 - 40 mm in the direction of the vertical flue partition wall, and is bonded and fixed with construction glue.

[0008] Preferably, the first flexible isolation layer is laid in the 10% - 30% interval in the height direction of the combustion chamber, and the second flexible isolation layer is laid in the 50% - 70% interval in the height direction of the combustion chamber.

[0009] Preferably, the protection device includes a multi-layer board, a handle is arranged on the multi-layer board, an anti-falling steel bar is arranged on one side of the multi-layer board, and the anti-falling steel bar extends outward from the multi-layer board; a supporting steel bar is arranged on the other side of the multi-layer board, the upper end of the supporting steel bar passes through the multi-layer board and is fixed by a nut, and the lower end is bent to form a horizontal section, and the protruding part of the anti-falling steel bar and the horizontal section at the lower end of the supporting steel bar are lapped on the protruding brick surface inside the combustion chamber.

[0010] Preferably, the movable protection board is lifted once every 4 - 7 layers of masonry, and is taken out before masoning the overhead brick of the combustion chamber.

[0011] Preferably, after installing the overhead brick in the combustion chamber, use a polyethylene film larger than the cross-sectional size by 20 mm to seal the viewing hole, and clean the inside of the viewing hole and replace the film every 3 - 4 layers of masonry.

[0012] Compared with the prior art, the prominent features of the present invention adopting the above technical solution are as follows: This method realizes dynamic segmented protection, achieves full-process dust prevention by laying flexible isolation layers in stages and dynamically adjusting the protection device, and avoids the cleaning blind areas of one-time protection in the traditional method. The protection device does not need to be repeatedly disassembled and installed as the masonry progress improves, reducing the high-altitude operation time; the protection device is taken out before overtopping to avoid interfering with the masonry of overtopping bricks and ensure full mortar joints, solving the problem of insufficient vertical joint mortar in the prior art. Description of the Drawings

[0013] Figure 1 is a schematic structural view when the first flexible isolation layer seals the vertical flue in the embodiment of the present invention; Figure 2 is a schematic structural view when the protection device is installed in the embodiment of the present invention; Figure 3 is a top view structural schematic of the protection device in the embodiment of the present invention.

[0014] Description of the reference numerals: 1, the first flexible isolation layer; 2, the brick trench; 3, the protection device; 301, the multi-layer board; 302, the handle; 303, the anti-falling steel bar; 304, the supporting steel bar; 305, the nut; 306, the detachable connecting piece; 4, the protruding brick surface; 5, the horizontal mortar joint. Specific Embodiments

[0015] The present invention will be further described below in conjunction with specific embodiments, and the purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0016] As Figures 1 to 3 shown, this embodiment provides a dynamic dust prevention construction method during the masonry of a coke oven combustion chamber, including the following steps: S1, the first protection stage: after the combustion chamber wall is masoned to a preset first height, the first flexible isolation layer 1 is laid on the wall top surface. Among them, the first flexible isolation layer 1 is laid in the 10%-30% interval in the height direction of the combustion chamber.

[0017] S2, the second protection stage: continue to mason upwards to a preset second height, and install the protection device 3 inside the combustion chamber. The protection device 3 is arranged on the structural support surface inside the combustion chamber.

[0018] The protection device 3 includes a multi-layer board 301, on which a handle 302 is provided. One side of the multi-layer board 301 is connected with a falling-prevention steel bar 303 through a detachable connecting piece 306, and the falling-prevention steel bar 303 extends outward from the multi-layer board 301; on the other side of the multi-layer board 301, a supporting steel bar 304 is provided. The upper end of the supporting steel bar 304 passes through the multi-layer board 301 and is fixed by a nut 305, and the lower end is bent to form a horizontal section. The protruding part of the falling-prevention steel bar 303 and the horizontal section at the lower end of the supporting steel bar 304 are lapped on the protruding brick surface 4 in the combustion chamber. In this embodiment, the detachable connecting piece 306 is a bolt. The bolt rod of the bolt is arranged on the falling-prevention steel bar 303, and the bolt nose of the bolt is arranged on the multi-layer board 301.

[0019] S3, Dynamic protection stage: Periodically adjust the position of the protection device 3 along with the masonry progress. In this embodiment, the protection device 3 is lifted every 4 - 7 layers of masonry, and the protection device 3 is removed after masonry reaches the preset third height; after masonry reaches the preset third height, clean the dust on the first flexible isolation layer 1 and then pierce it, and lay the second flexible isolation layer. Among them, the second flexible isolation layer is laid in the range of 50% - 70% of the height direction of the combustion chamber.

[0020] Specifically, both the first flexible isolation layer 1 and the second flexible isolation layer are made of polyethylene film, and the size is made according to the cross-sectional size of the combustion chamber vertical flue. When laying, the polyethylene film covers the cross-section of the vertical flue and extends 20 - 40 mm towards the wall top surface, and is fixed by an adhesive. In this embodiment, the polyethylene film covers the brick surface with a width of 25 mm in the direction of the combustion chamber wall, and covers the brick surface with a width of 30 - 40 mm in the direction of the vertical flue partition wall, and is bonded and fixed with construction glue.

[0021] S4, Final sealing stage: After the over-roof masonry of the combustion chamber is completed, clean the dust on the second flexible isolation layer and then pierce it, and conduct top sealing protection on the top opening of the combustion chamber.

[0022] S5, Continuous maintenance stage: During the subsequent masonry process, regularly update the top sealing protection until the masonry is completed.

[0023] Specifically, during top sealing protection, use polyethylene film for protection. The size of the film is 20 mm larger than the size of the viewing hole (at the cross-section). A 20 - mm-wide edge of the film is bonded and fixed with the top surface of the masonry using construction glue; clean the dust on the top sealing protection every 3 - 4 layers of masonry, then pierce it, and conduct top sealing protection on the new top of the combustion chamber again.

[0024] Taking a 6.25-meter tamping coke oven as an example, the specific implementation steps of the dynamic dust-proof construction method of the present invention are as follows: S1, First protection stage: When the masonry reaches the 8th floor, a sloping passage sealing film will be pre-covered on the sloping passage opening. Polyethylene film can be used for the sloping passage sealing film to prevent mud or dust from entering the sloping passage during masonry; when the combustion chamber masonry reaches the 15th floor (the preset first height), suspend the masonry and complete the following operations: Clean the sloping passage opening and the bottom of the combustion chamber: Use a vacuum cleaner to remove the accumulated ash at the sloping passage opening and the bottom to ensure that there is no mud residue. Seal the spout of the burner brick: Seal the spout with tape to prevent impurities from falling in during subsequent construction. Pierce the sloping passage sealing film between the 8th and 9th floors and install the adjusting brick at the designated position of the sloping passage opening.

[0025] Such as Figure 1 , On the brick surface of the 15th floor, lay the first flexible isolation layer 1. The first flexible isolation layer 1 is made of polyethylene film. The film size is customized according to the cross-section of the vertical flue. After covering the vertical flue, it extends to the top surface of the back wall. The width of the film covering the brick surface in the direction of the combustion chamber wall is greater than or equal to 25mm, and the width of the film covering the brick surface in the direction of the vertical flue partition wall is 30 - 40mm, and it is bonded and fixed with construction glue. Note that when the film is bonded, the position of the film should not exceed the brick gutter 2.

[0026] S2: Second protection stage: Continue to masonry to the 21st floor (the preset second height), install the protection device 3 inside the combustion chamber (at the position of the 20th floor), place the multi-layer board 301 on the protruding brick surface 4 inside the combustion chamber, and the anti-falling steel bars 303 and the horizontal sections of the supporting steel bars 304 are respectively lapped on the brick surfaces on both sides to form a stable support; adjust the position of the multi-layer board 301 through the handle 302 to ensure that it completely covers the underlying masonry to prevent dust from falling.

[0027] S3, Dynamic protection stage: After every 6 floors of upward masonry, lift the protection device 3 upward through the handle 302 once without disassembly. When the masonry reaches the 33rd floor (the preset third height), use a vacuum cleaner to clean the accumulated ash on the first flexible isolation layer 1, pierce the first flexible isolation layer 1 and then thoroughly remove the remaining impurities; lay the second flexible isolation layer, and its size and fixing method are the same as those of the first flexible isolation layer 1. Both the first flexible isolation layer 1 and the second flexible isolation layer can be made of polyethylene film. Before masonry of the combustion chamber overhead brick, remove the protection device 3.

[0028] When piercing the first flexible isolation layer 1, use a sharp tool (such as a crochet hook) to pierce the center of the film.

[0029] S4, Final sealing stage: When masonry of the combustion chamber overhead brick, scrape the mud under the overhead brick clean as masonry progresses; after the masonry of the combustion chamber overhead brick is completed, clean the dust on the second flexible isolation layer and pierce it; use a polyethylene film with a size 20mm larger than the cross-section of the viewing hole to make the top sealing protection, seal the top opening, and bond and fix the film edge to the top surface of the masonry.

[0030] S5, Continuous maintenance stage: Every 3 - 4 layers of masonry are laid subsequently, the accumulated ash inside the sight hole is cleaned, and the top sealing film is replaced; Repeat until the masonry is completed to ensure dust prevention throughout the process.

[0031] During the above construction process, the presence of the polyethylene film (ramp sealing film, the first flexible isolation layer 1, the second flexible isolation layer, top sealing protection) only serves to isolate and facilitate cleaning, and will not affect the construction workers' control over the quality of the horizontal mortar joint 5. When the coke oven combustion chamber is in operation, it is in a high-temperature environment. The polyethylene film is tightly filled in the mortar joint and will not form an obvious air circulation channel. Therefore, it will not affect the normal production and masonry quality of the coke oven.

[0032] In actual construction, after adopting the method of the present invention, the masonry efficiency of the combustion chamber has been significantly improved, the cleaning effect of dust and slurry has been greatly improved, the masonry quality fully meets the design requirements, and there are no problems such as blockage of the inclined flue or incomplete mortar joints.

[0033] The above are only the preferred embodiments of the present invention that can be implemented, and do not limit the scope of the rights of the present invention accordingly. Any equivalent changes made by using the content of the specification and drawings of the present invention are included within the scope of the rights of the present invention.

Claims

1. A dynamic dust prevention construction method during the masonry process of a coke oven combustion chamber, characterized in that, It includes the following steps: S1, the first protection stage: After the combustion chamber wall is built to a preset first height, lay the first flexible isolation layer (1) on the top surface of the wall; S2, the second protection stage: Continue to build upwards to a preset second height, install the protection device (3) inside the combustion chamber, and the protection device (3) is arranged on the structural support surface inside the combustion chamber; S3, the dynamic protection stage: Periodically adjust the position of the protection device (3) along with the building progress, and when building to the preset third height, clean the dust on the first flexible isolation layer (1) and then pierce it, and lay the second flexible isolation layer; Remove the protection device (3) when building the upper layer of the overhead masonry; S4, the final sealing stage: After the overhead masonry of the combustion chamber is completed, clean the dust on the second flexible isolation layer and then pierce it, and conduct top sealing protection on the top opening of the combustion chamber; S5, the continuous maintenance stage: During the subsequent building process, regularly update the top sealing protection until the building is completed.

2. The dynamic dust prevention construction method during the lining process of the coke oven combustion chamber according to claim 1, characterized in that: Both the first flexible isolation layer (1) and the second flexible isolation layer are made of polyethylene film, and the size is made according to the cross-sectional size of the combustion chamber vertical flue. When laying, the polyethylene film covers the cross-section of the vertical flue and extends 20 - 40 mm towards the top surface of the wall, and is fixed by an adhesive.

3. The dynamic dust prevention construction method during the lining construction of the coke oven combustion chamber according to claim 2, characterized in that: The polyethylene film covers the brick surface ≥ 25 mm in the direction of the combustion chamber wall and covers the brick surface 30 - 40 mm in the direction of the vertical flue partition wall, and is bonded and fixed with construction glue.

4. The dynamic dust prevention construction method during the masonry process of the coke oven combustion chamber according to claim 1, characterized in that: The first flexible isolation layer (1) is laid in the 10% - 30% interval in the height direction of the combustion chamber, and the second flexible isolation layer is laid in the 50% - 70% interval in the height direction of the combustion chamber.

5. The dynamic dust prevention construction method during the lining process of the coke oven combustion chamber according to claim 1, characterized in that: The protection device (3) includes a multi-layer board (301), a handle (302) is arranged on the multi-layer board (301), one side of the multi-layer board (301) is connected with a fall-prevention steel bar (303) through a detachable connector (306), and the fall-prevention steel bar (303) extends outward from the multi-layer board (301); A supporting steel bar (304) is arranged on the other side of the multi-layer board (301), the upper end of the supporting steel bar (304) passes through the multi-layer board (301) and is fixed by a nut (305), and the lower end is bent to form a horizontal section, and the protruding part of the fall-prevention steel bar (303) and the horizontal section at the lower end of the supporting steel bar (304) are lapped on the protruding brick surface (4) inside the combustion chamber.

6. The dynamic dust prevention construction method during the construction of the coke oven combustion chamber masonry according to claim 1, characterized in that: The movable protection board is lifted once every 4 - 7 layers of masonry and is taken out before building the overhead brick of the combustion chamber.

7. The dynamic dust prevention construction method during the lining process of the coke oven combustion chamber according to claim 1, characterized in that: After installing the overhead brick in the combustion chamber, use a polyethylene film larger than the cross-sectional size by 20 mm to seal the viewing hole, and clean the inside of the viewing hole and replace the film every 3 - 4 layers of masonry.

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