Reinforcing method for deformation of coke oven exhaust flue side wall

Abstract

The present application belongs to the field of metallurgical coking production, and relates to a reinforcing method for deformation of a coke oven flue side wall. In view of the deformation and collapse of the coke oven flue side wall, cutting and removal are performed from the vault top, the top concrete block and refractory bricks are lifted and moved, and the hole is opened according to the predetermined size. After the safety condition is met, the accumulated residue and collapsed refractory bricks in the flue are manually removed, it is ensured that there is no accumulation of foreign matters near the collapsed part, the deformed part of the side wall is reinforced, the coke oven flue gas outlet channel is maintained, and the normal production of the coke oven is ensured. The present application solves the problem of flue side wall deformation and collapse at one time, and does not need blind repair holes, and has low operation difficulty and controlled safety risk, which can effectively solve the current problem and provide necessary conditions for stable and high-load production of the coke oven.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metallurgical coking production, and relates to a reinforcing method for deformation of a coke oven flue gas chimney side wall. BACKGROUND

[0002] The coke oven flue is used to connect the chimney with the coke oven, and under the action of thermal buoyancy, a certain suction force is generated, so that the gas flow generated in the heating system of the coke oven is discharged, the combustion waste gas is discharged, and the combustion air is introduced, so that the continuous heating and normal production of the coke oven are realized.

[0003] The coke oven of the iron mill frequently appears insufficient suction phenomenon in daily production, which is difficult to effectively solve through the adjustment of the flue turning plate and the adjustment of the total flue turning plate, and then it is judged that the total flue is accumulated with slag and the side wall is deformed or even collapsed, so that the effective utilization space of the flue becomes smaller, and the coke oven waste gas is difficult to discharge; thus, under the condition that the coke oven load is high, the normal heating of the coke oven is affected, and the normal production cannot be guaranteed, so the flue needs to be reinforced.

[0004] The existing technology is to judge the flue inlet and open multiple holes to form a repair hole for grouting and shotcreting to achieve the method of reinforcing the flue, but this method is suitable for local reinforcement and is not suitable for large-area collapse of the flue side wall. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a reinforcing method for deformation of a coke oven flue gas chimney side wall, which is suitable for large-area collapse of the flue side wall.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a reinforcing method for deformation of a coke oven flue gas chimney side wall, comprising the following steps:

[0007] S1, the coke oven with a larger affected flue suction force in the daily production process is treated, the hole size is designed according to 3*3 meters according to the size of the reinforcing material and the air replacement requirement, and the line is drawn in advance, then the top cover of the flue vault part is cut off by a chain saw, and the residual material is cleaned and removed to expose the flue vault;

[0008] S2, the refractory bricks exposed in the vault part are removed block by block, in order to reduce the influence on the coke oven during the removal process, the coke oven is still in the state of continuous production, therefore, a part of the refractory bricks is covered with a wooden formwork and insulation cotton after being removed, so as to reduce the influence on the production of the coke oven;

[0009] S3, the coke oven stops heating, and the blast furnace gas and coke oven gas plus-minus cocks are closed one by one, the switch is converted to a manual state, and a maintenance card is hung;

[0010] S4, the coke oven machine, the coke side flue turning plate and the total flue turning plate are adjusted to a full-closed state;

[0011] S5, arrange the maintenance personnel to open the total flue top dome, cover, so that cold air enters, and stabilize the gas collector pressure to 100 Pa, and special personnel are arranged to prevent large fluctuations in pressure;

[0012] S6, before entering the total flue from the opening position, first analyze the CO and O2 content in the total flue with a four-in-one alarm instrument, and confirm whether the combustible gas component is within the explosion limit, and at the same time, the pigeon prepared in advance is sent into the flue to test safety;

[0013] S7, after confirming the safety of the total flue, the safety personnel enter the total flue with tools;

[0014] S8, the residual mud, collapsed bricks, collapsed concrete and other debris in the total flue are transported out by a basket;

[0015] S9, for the case where the flue side wall is deformed but not collapsed, a 2100 mm 14 slot steel is connected above and below the flue flap arc-shaped baffle near the flue flap, and then the slot steel is vertically connected to form a frame structure;

[0016] S10, the two side walls are connected with the slot steel by welding a flat steel into a mesh to wrap the flue flap valve side walls and prevent further collapse.

[0017] Optionally, in step S2, to prevent the refractory bricks from shrinking and falling off after cooling, the brick removal process should be as quick as possible, and the bricks should be covered while being removed to avoid large-scale brick falling.

[0018] Optionally, in step S3, the coke oven stops heating by reducing the flow rate first and then reducing the suction, and a flue construction report is required before switching.

[0019] Optionally, before step S7, because the coke oven has serious leakage in some combustion chambers, all the sight holes of the severely leaking combustion chambers are opened, so that waste gas and leaked raw coal gas are discharged from the top of the oven and do not enter the flue system as much as possible.

[0020] Optionally, in step S9, the 14 slot steel above and below the flue flap arc-shaped baffle is tightly attached to the side wall bricks.

[0021] Optionally, in step S9, DN100 pipes are used to horizontally reinforce the frame without affecting the opening and closing of the flue flap.

[0022] The beneficial effect of the present application is that the coke oven waste flue side wall deformation reinforcing method of the present application, aiming at the deformation and collapse of the coke oven flue side wall, cuts and removes from the vault position, hoists and removes the top concrete block and refractory brick, opens holes according to the specified size, manually removes the accumulated slag and collapsed refractory bricks in the flue after the safety conditions are met, ensures that there is no foreign matter accumulation near the collapsed part, simultaneously reinforces the deformed part of the side wall, maintains the coke oven waste gas outlet channel, and ensures the normal production of the coke oven.

[0023] Other advantages, objects, and features of the present application will be understood in view of the following specification, will be apparent to those skilled in the art, or will be learned from the practice of the present application. The objects and other advantages of the present application can be realized and obtained by means of the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the preferred detailed description of the present application will be combined with the drawings as follows, in which:

[0025] Fig. 1 The figure is a schematic diagram of the flue side wall deformation of the present application;

[0026] Fig. 2 The figure is a schematic diagram of the frame structure of the present application. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described below through specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the specification. The present application can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the figures provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and the following examples and features in the examples can be combined with each other without conflict.

[0028] The figures are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the present application; in order to better illustrate the embodiments of the present application, some components in the figures can be omitted, enlarged or reduced, and do not represent the size of the actual product; it can be understood by those skilled in the art that some well-known structures and their descriptions in the figures can be omitted.

[0029] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0030] Please refer to Figs. 1-2 A reinforcing method for deformation of a coke oven waste flue side wall, when the flue accumulates slag, the side wall deforms, the side wall collapses, the effective utilization space of the flue becomes smaller, and the coke oven waste gas is difficult to guide out, in the case that the coke oven does not have a major repair, only the cutting and removal can be carried out from the vault position, the top concrete block and the refractory brick are lifted and moved, the hole is opened according to the predetermined size, after the safety condition is met, the accumulated slag and the collapsed refractory brick in the flue are manually removed, it is ensured that there is no foreign matter accumulation near the collapsed part, at the same time, the deformed part of the side wall is reinforced, the coke oven waste gas guiding channel is maintained, and the specific operation is as follows:

[0031] 1. The coke oven affected by the flue suction force in the daily production process is treated;

[0032] 2. According to the size of the reinforcing material and the air replacement requirement, the hole size is designed according to 3*3 meters, and the line is drawn in advance;

[0033] 3. The chain saw is used to cut the predetermined size of the top cover of the flue vault position (the thickness of this concrete is about 46 cm), and the residual material is cleaned and removed to expose the flue vault;

[0034] 4. The refractory bricks exposed in the vault position are removed block by block, in order to reduce the influence on the coke oven during the removal process, because the coke oven is still in the production state at this time, therefore a part of the refractory bricks is covered with a wooden template and thermal insulation cotton after a part of the refractory bricks is removed, so as to reduce the influence on the coke oven production (in order to prevent the refractory bricks from shrinking and falling off after being cooled, the brick taking process needs to be as fast as possible, and the bricks are taken and covered at the same time to avoid a large area of brick falling);

[0035] 5. The 1# and 2# coke ovens stop heating (first reduce the flow and then reduce the suction force), and the blast furnace gas and the coke oven gas are closed one by one, the switch is converted to the manual state and the maintenance card is hung (before switching, the flue construction report is exchanged);

[0036] 6. The 1# and 2# coke oven machines, the side flue flaps and the total flue flaps are adjusted to the full-closed state;

[0037] 7. Arrange the maintenance personnel to open the total flue top arch, cover, so that cold air enters;

[0038] 8. Stabilize the gas collector pressure to 100 Pa, and have a person monitor to avoid large fluctuations in pressure;

[0039] 9. Because the 1# and 2# coke ovens have serious leakage in the combustion chamber, open the 1-4# and 28-32# and the fire hole covers of the combustion chamber with serious leakage, so that the waste gas and the leaked raw coal gas are discharged from the oven top, and do not enter the flue system as much as possible;

[0040] 10. Before entering the total flue from the opening position, first analyze the CO and O2 content in the total flue with a four-in-one alarm instrument, and confirm whether the combustible gas component is within the explosion limit, and at the same time, send the prepared pigeons into the flue to test safety;

[0041] 11. After confirming the safety of the total flue, two people wear safety belts, tie safety ropes, wear labor protection articles and long tube respirators, four-in-one alarm instruments and temperature measuring guns to enter the total flue;

[0042] 12. The residual mud, collapsed bricks, collapsed concrete and other sundries in the total flue are transported out through a lifting basket;

[0043] 13. For the case of deformation of the flue side wall but not collapse, at the position near the flue flap, above and below the arc-shaped baffle of the flue flap, a 14# channel steel is connected to about 2100 mm (close to the side wall brick), and then a vertical butt joint is made with a channel steel, so that the channel steel forms a frame structure, and additionally, a DN100 pipeline can be used for transverse reinforcement at the frame without affecting the opening and closing of the flue flap;

[0044] 14. The two side wall surfaces are connected with the channel steel by welding a mesh of flat steel, so that the flue flap valve is wrapped on both sides of the wall body, and the continuous collapse in the later period is prevented;

[0045] After using the reinforcement method, the suction stability of the 1# and 2# coke ovens in the production process is good, and the problem of insufficient suction due to poor flue discharge is not generated; the method can solve the problems of deformation and collapse of the flue side wall at one time, does not need to blindly repair holes, has low operation difficulty and controlled safety risk, and can effectively solve the current problems, and provide necessary conditions for stable and high load production of the coke oven.

[0046] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A method for reinforcing the deformed sidewall of a coke oven flue, characterized in that, Includes the following steps: S1, combined with the coke ovens whose flue suction is greatly affected during daily production, the opening size is designed according to 3*3 meters based on the size of the reinforcement material and the air replacement requirements. The lines are drawn in advance, and then the top cover of the flue arch is cut off with a chainsaw of the predetermined size, and the remaining materials are cleaned up to expose the top of the flue arch. S2, remove the exposed refractory bricks at the top of the arch piece by piece. In order to reduce the impact on the coke oven during the removal process, since the coke oven is still in production, the refractory bricks are covered with wooden templates and insulation cotton as they are removed to reduce the impact on coke oven production. S3, the coke oven stops heating, and the blast furnace gas and coke oven gas add / remove valves are closed one by one. The switch is switched to manual mode and a maintenance sign is hung. S4, adjust the coke oven machine, coke side flue flap, and main flue flap to the fully closed state; S5, arrange for maintenance personnel to open the arch and cover at the top of the main flue to allow cold air to enter, stabilize the pressure of the gas collection pipe at 100Pa, and have a dedicated person monitor to avoid large pressure fluctuations; S6. Before entering the main flue from the opening, use a four-in-one alarm device to analyze the CO and O2 content in the main flue and confirm whether the combustible components are within the explosion limit. At the same time, send the prepared pigeons into the flue to test the safety. S7. After confirming that it is safe inside the main flue, safety personnel enter the main flue with tools. S8, using a hoisting basket to transport out the remaining mud, collapsed bricks, collapsed concrete and other debris around the main flue; S9, for cases where the flue sidewall is deformed but not collapsed, 2100mm of No. 14 channel steel is extended above and below the flue flap at the location near the flue flap. Then, channel steel is vertically connected to form a frame structure. S10, the two side walls are welded with flat steel into a mesh and connected to the channel steel to wrap the walls on both sides of the flue flap valve, preventing further collapse in the future.

2. The method for reinforcing the deformed sidewall of a coke oven flue according to claim 1, characterized in that: In step S2, to prevent the refractory bricks from shrinking and falling off after cooling, the brick removal process should be as quick as possible, and the bricks should be covered while removing them to avoid large areas of brick falling off.

3. The method for reinforcing the deformed sidewall of a coke oven flue according to claim 1, characterized in that: In step S3, when the coke oven stops heating, the flow rate should be reduced first, followed by the suction. Before switching the exchanger to manual mode, the flue construction party should be notified to ensure that the circuit is safely isolated.

4. The method for reinforcing the deformed sidewall of a coke oven flue according to claim 1, characterized in that: Before step S7, due to severe leakage in some combustion chambers of the coke oven, all the inspection hole covers of the severely leaking combustion chambers are opened to allow the exhaust gas and leaked raw coal gas to be discharged from the top of the furnace, and to prevent them from entering the flue system as much as possible.

5. The method for reinforcing the deformed sidewall of a coke oven flue according to claim 1, characterized in that: In step S9, the No. 14 channel steel above and at the bottom of the flue flap arc baffle is closely attached to the side wall bricks.

6. The method for reinforcing the deformed sidewall of a coke oven flue according to claim 5, characterized in that: In step S9, the frame is horizontally reinforced with DN100 pipes at a location that does not affect the flue flap switch.

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