CN115353895A

CN115353895A - Large-area uncovering maintenance method for coke oven combustion chamber

Info

Publication number: CN115353895A
Application number: CN202210954307.XA
Authority: CN
Inventors: 陈举; 朱署; 周崇俊; 张存贵; 王武军; 保德山; 李晓峰; 王恩阁; 王晓东; 马兴翼; 解明巍; 柴鑫
Original assignee: Yunnan Dawei Coke Co ltd; Acre Coking and Refractory Engineering Consulting Corp MCC
Current assignee: Yunnan Dawei Coke Co ltd; Acre Coking and Refractory Engineering Consulting Corp MCC
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2022-11-18
Anticipated expiration: 2042-08-10
Also published as: CN115353895B

Abstract

The invention relates to the technical field of coke oven maintenance, in particular to a large-area uncovering maintenance method for a coke oven combustion chamber. The method comprises the following steps of preserving heat of adjacent combustion chambers in a demolition area, supporting adjacent combustion chambers in the demolition area, preventing accretion of braising furnaces in the adjacent carbonization chambers in the demolition area for a long time, replacing bottom bricks of the carbonization chambers, repairing cracks in reserved chute areas, repairing cracks in reserved regenerators, repairing cracks in reserved small flues, repairing cracks in reserved brick gas channels, controlling the furnace length and expansion of newly built combustion chambers, ensuring the width and taper of the carbonization chambers between the demolition area and combustion chambers which are not demolished, ensuring the superposition of inclined channel openings of the newly built combustion chambers and inclined channel openings of the original chute areas, controlling the building of newly built combustion chambers adjacent to the combustion chambers which are not demolished, reinforcing a furnace column, fixing a protection plate, reinforcing a large vehicle track on the top of a furnace, baking the furnace body and controlling the coal charging and production of the carbonization chambers. The period of large-area uncovering maintenance period is shortened, and various technical problems in uncovering maintenance are solved.

Description

Large-area uncovering maintenance method for coke oven combustion chamber

Technical Field

The invention relates to the technical field of coke oven maintenance, in particular to a large-area uncovering maintenance method for a coke oven combustion chamber.

Background

The coke oven is large-scale industrial equipment for coke production, the general service life can reach about 15-30 years, but a plurality of coke ovens, particularly a tamping coke oven, have the phenomena of large-scale difficult coke discharging and leakage after being used for more than 10 years, and are mainly caused by the deformation, cracking, perforation and the like of the oven wall of a carbonization chamber. The problems can be solved by spray repair, welding repair, patching, ceiling suspension, uncovering and the like, wherein the uncovering is the most thorough mode for maintenance.

However, due to the influence of a plurality of technical factors, uncovering maintenance easily causes a plurality of problems that the inclined port of a newly built combustion chamber is not aligned with the original inclined port, the furnace wall is lengthened after recovery, the width taper of a carbonization chamber at the side of maintenance is abnormal, the braising number is nodulated and the like, and more importantly, the uncovering width at one time does not exceed 5 continuous combustion chambers at most, so that the uncovering maintenance period of a large area or the whole combustion chamber is too long, and the normal production of an enterprise is influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a large-area uncovering maintenance method for a coke oven combustion chamber, which shortens the period of the large-area uncovering maintenance period, solves various technical problems in uncovering maintenance, improves the maintenance quality and prolongs the service life of the coke oven.

In order to achieve the purpose, the invention adopts the following technical scheme:

a large-area uncovering maintenance method for a coke oven combustion chamber comprises a preparation stage, a dismantling stage, a building stage, an oven drying stage and a production stage:

1) A preparation stage:

(1) cooling the combustion chamber: synchronously cooling a combustion chamber to be dismantled, a braising furnace number combustion chamber, a buffering furnace number combustion chamber and a secondary buffering furnace number combustion chamber, and then preserving heat;

(2) controlling the number of the braising furnace: after the furnace is pushed empty in the dismantling area, the braising furnace number carbonization chamber is sealed in positive pressure, then coal charging is carried out, the braising furnace is started, a smoke guide hole cover, a coal charging hole cover and a furnace door knife edge are sealed after braising, and a valve body turning plate corresponding to a braising furnace number ascending pipe is always kept in an open state;

(3) protection of a gas collecting pipe, a dust removing main pipe and a water seal tank of a smoke guide vehicle: sliding marks are made on the supports of the gas collecting pipe support and the flap valve, the dust removing main pipe bracket and the smoke guide vehicle water seal groove bracket, so that sliding obstacles are removed, the sliding condition is periodically checked in the furnace cooling process, and the smooth sliding is ensured;

(4) adjusting a sliding line of the coke guide: adjusting the sliding line of the coke guide in the maintenance area outwards;

(5) reinforcing a large car track on the top of the furnace: reinforcing the cart track at the top of the demolition area by combining a section steel group and a vertical support;

(6) dismounting an ascending pipe and protecting a bridge pipe: after the maintenance carbonization chamber is emptied, cooling to below 600 ℃, integrally removing the ascending pipe, the bridge pipe and the water sealing cover, tightly covering the bridge pipe leading seat opening with an environment-friendly ceramic fiber felt and sealing with fire clay;

(7) erecting a rain-proof shed and a truss: building a rain-proof shed on the maintenance area, and draining rainwater outside the furnace area;

(8) controlling iron pieces during cooling: before cooling: loosening the foundation bolts and opening the brace ditch; when the temperature is reduced: adjusting the large spring and the small spring to a specified tonnage larger than the production tonnage;

(9) reinforcing the furnace column: after the ascending pipe is dismantled, before the refractory bricks are dismantled, the furnace columns of the maintenance area and two furnace columns on each side of two sides of the maintenance area are welded together by profile steel;

and (E) protection plate fixing: fixing the protective plate together with the furnace door frame to the furnace column;

taking a furnace door: before the furnace top is dismantled, all machine coke side furnace doors of a carbonization chamber in a maintenance area are removed;

chute and regulation brick and lamp holder brick protection: before the furnace top is dismantled, the ceramic fiber felt is dismantled into strips with the width of 30-80 mm, and the strips are put down from the vertical flue to protect the adjusting bricks, the chute and the lamp holder bricks;

2) And (3) a dismantling stage:

(1) dismantling a furnace top area: removing the refractory bricks passing through the top of the carbonization chamber and above by using an excavator;

(2) dismantling the combustion chamber: after the furnace top area is dismantled, the excavator continues to downwards dismantle all the combustion chambers synchronously, parallelly and downwards, and the dismantled refractory bricks are discharged to the middle of a machine side cart track;

(3) dismantling bottom bricks of the carbonization chamber: removing bottom bricks of the carbonization chamber and cleaning;

(4) insulating the furnace walls of adjacent combustion chambers: in the dismantling process, 2 layers of aluminum silicate fiber felts with the thickness of 25-30mm are timely attached to the exposed wall surfaces of the adjacent combustion chambers on two sides in a staggered manner for heat preservation, so that the temperature of the exposed wall surfaces is kept above 850 ℃;

(5) and (3) supporting the furnace wall of the adjacent combustion chamber: in the dismantling process, the furnace walls exposed out of the combustion chambers on the two sides are supported from top to bottom by using a support while dismantling;

(6) dismantling the sealing wall of the regenerator: erecting a maintenance operation platform at a regenerator to be maintained in the flue corridor, and then manually removing a regenerator sealing wall;

(7) drawing out checker bricks of the regenerator: after the wall sealing of the heat storage chamber is removed, digging out all checker bricks and grate bricks in the heat storage chamber, and removing a layer of plate protection bricks;

3) A building stage:

(1) building the bottom of the carbonization chamber:

the gaps of the inclined ways with the diameters of 2-5mm are filled by silicon fire clay pointing, the gaps of the inclined ways with the diameters of 5-10mm are filled by silicon fire clay doped with aggregates, and for the gaps of the inclined ways with the diameters of more than 10mm, besides the silicon fire clay doped with the aggregates, the gaps are filled with broken brick slag;

building according to the actual size of the detached inclined channel area, and reserving an expansion joint;

(2) laying and setting out a combustion chamber: arranging combustion chamber control lines at the bottom of the coking chambers to ensure the width and the taper of each coking chamber, wherein the central lines of each coking chamber and each combustion chamber are parallel to each other and are vertical to the central line of the coke oven or the cart rail at the coke side of the machine;

(3) building a combustion chamber: the slurry is required to be full for all masonry, and the thickness, verticality and flatness of mortar joints are accepted according to the standard acceptance of Industrial furnace masonry engineering construction acceptance; the elevation of one side close to the undetached combustion chamber is higher than that of the other side due to uneven cooling shrinkage of a chute area at the lower part of the new combustion chamber adjacent to the undetached combustion chamber, 3mm thick felt paper is padded at the bottom of the lower side during building, the upper surface of the felt paper is normally plastered and built, and if the wall of the combustion chamber is not flat, 3mm thick felt paper is padded until the upper part of the combustion chamber is horizontal after two layers of bricks are built;

because the height of the chute area machine and the coke side furnace end in the cooling shrinkage non-uniform dismantling area is lower than the height of the middle mark of the furnace, the method of padding the felt paper is also adopted for leveling during building;

(4) building a furnace top area: the last two layers of the furnace top surface and the last two layers of the fire observation hole walls are not built during the whole building, and the leveling building is carried out after the furnace baking is finished;

(5) erecting a jump frame: erecting a jumping stand in the carbonization chamber, wherein the height of the jumping stand is increased along with the height of the combustion chamber wall;

(6) supporting the wall surface: when a new wall is built, two carbonization chambers on each side are internally supported and protected by a group at intervals of 4 flame paths; cleaning the carbonization chambers in front of the oven, performing a group of support protection in all the carbonization chambers at intervals of 4 flame paths, and removing all supports after the oven is dried;

(7) wall surface heat preservation: 2 layers of aluminum silicate fiber felts with the thickness of 25-30mm are respectively attached to the wall surface of one side of the newly built combustion chamber close to the old combustion chamber in a staggered joint manner, the wall surface is insulated, and the building and the attaching are carried out simultaneously;

(8) protection of the bottom of the carbonization chamber: after the building of the bottom bricks of the carbonization chamber is finished, paving asbestos felt and an iron springboard on the bottom bricks for protection, and paving the asbestos felt and the iron springboard after placing for 24 hours after the building of the bottom bricks of the carbonization chamber at the sides is finished;

(9) controlling the temperature of the side combustion chamber: keeping the combustion chamber ventilated, covering the upper opening of a lamp cap brick of the side combustion chamber with thick felt paper, blocking the opening of a chute leading to the production regenerator of the side combustion chamber with asbestos felt, blocking the opening of the chute leading to the production regenerator of the side combustion chamber with the asbestos felt, and taking out the side combustion chamber after the furnace is baked;

construction of the hearth of the coke dry oven and the sealing wall of the carbonization chamber: after the carbonization chamber is cleaned and supported, a baking furnace fire bed and a carbonization chamber sealing wall are built;

wall surface treatment of a regenerative chamber and a small flue: pointing the wall surfaces of the regenerator and the small flue, locally repairing the seriously damaged wall surfaces or the damaged parts of the pipe bricks of the gas pipeline, and grouting the gap between the protective plate brick and the wall body after the protective plate brick is rebuilt;

the grate bricks and the checker bricks are repeatedly arranged: after the heat storage chamber and the small flue wall surface are treated, the grate bricks and the lattice bricks are repeatedly swung, and after the repeated swinging is finished, brick covering and slag receiving iron plates are placed on the lattice bricks on the two sides of the machine and the coke and inwards to the 1-32# vertical flame path;

and (3) rebuilding the regenerator sealing wall: re-building the regenerator sealing wall, reserving a hole at the upper part of the sealing wall for extracting the slag receiving iron plate, extracting the iron plate before baking to seal the reserved hole, and smearing heat insulation materials on the outer surface of the sealing wall in a hot state;

4) And (3) oven drying stage:

(1) installing a baking oven gas pipeline: the oven gas pipeline is led out from a return oven gas pipeline of a coke oven of a basement, is divided into two sides of the oven and is arranged on an oven post above a side waste gas shutter, a pressure measuring port, a cleaning port and an explosion-proof, diffusing, draining and sampling device are arranged on the pipeline, oven gas branch pipes are arranged in front of each maintained carbonization chamber, and each branch pipe is connected to the oven gas pipeline through a hole plate;

(2) installing a baking furnace burner: a gas burner is adopted, the gas burner is arranged on a furnace drying hole of a carbonization chamber sealing wall in front of a furnace, and a pipeline is connected to a furnace drying gas branch pipe;

(3) installing a temperature measuring system of the drying oven: a thermocouple is inserted into a management flame path of each row of combustion chambers for temperature measurement of the oven;

(4) oven temperature rise control: when the baking furnace is just started, the baking furnace burners of the two carbonization chambers are not ignited, the temperature of the two combustion chambers is controlled to rise by heat transfer of the adjacent hot walls, and the baking furnace burners are ignited when the temperature does not rise by the heat transfer;

(5) controlling the iron pieces of the oven: after the furnace is dried, the spring of the pressing plate on the front surface of the inclined chute is adjusted every day to keep the corresponding tonnage pressure and promote the absorption of the gaps in the inclined chute; monitoring the change of a gap between a furnace shoulder of the combustion chamber and a protection plate every day, unlocking a large spring after the combustion chamber expands to contact the protection plate, recovering the tonnage of the large spring and the tonnage of the small spring, removing the furnace column for reinforcement and fixing the protection plate;

(6) thermal state engineering: carrying out thermal construction after the temperature of the oven reaches 600 ℃;

(7) turning the inside to heat: when the temperature of the oven reaches 800 ℃, the interior of the basement is heated, the temperature is continuously raised to meet the coal charging requirement, and the heating of the oven gas system is stopped after the interior is heated;

(8) dismantling a temperature measurement system of the drying furnace: after internal heating, the temperature measurement system of the baking oven is removed and the temperature is measured by an infrared pyrometer;

(9) dismantling a furnace baking gas system: and (4) after stopping heating of the oven gas system, replacing the gas in the oven gas pipe with nitrogen, and removing the oven gas pipe after replacement.

C, detaching a carbonization chamber sealing wall: removing the sealing wall of the carbonization chamber and the oven fire bed after the interior of the carbonization chamber is heated, taking out the support in the carbonization chamber, cleaning the bottom of the carbonization chamber, and hanging the oven door;

5) A production stage:

(1) initially charging coal: the coal charging of all the coking chambers is completed within 24 hours, the coking time of the first round is 1.5 coking cycles, and the coal charging amount of the first round is 80 percent of the normal coal charging amount;

(2) increasing the coal loading amount to reach the yield: when the coke pushing current is stable and close to the normal coke pushing current, the standard temperature is gradually increased, the coking time is shortened, and the coal charging quantity is increased until the yield is reached.

1) In the step (5), I-steel groups welded together by two I-steels are respectively arranged on two sides of each furnace roof cart track, and two ends of each I-steel group are respectively pressed on the surfaces of two hole carbonization chambers outside a maintenance area by padding steel plates;

channel steel is welded at the position of each carbonization chamber between two I-steel groups of each track to drag and fix the cart track on the top of the furnace;

1 group of supports are arranged between the bottom of the coking chambers at the machine side and the coke side and the I-shaped steel group every 3-4 coking chambers to support the I-shaped steel group, the lower part of each support is dragged by a jack, and the lower part of the jack is padded with a steel plate and a sleeper and pressed on a bottom brick of the coking chamber;

the middle of the I-steel groups at the two sides of the coke and the coke is fixedly supported by 1 steel pipe and 1 lacing wire every 4-5 carbonization chambers, and the outer side of the I-steel group is also fixedly supported by the steel pipe, the lacing wire and H-shaped steel for fixing the furnace column.

1) After the middle (9) ascending pipe is dismantled and before the refractory bricks are dismantled, reinforcing the coke side furnace pillars, welding the furnace pillars of the maintenance area and two furnace pillars on each side of two sides of the maintenance area together by using H-shaped steel for furnace pillar reinforcement, and adding sizing blocks into the sunken parts between the furnace pillars and the H-shaped steel for full welding;

if one side is a resisting wall, the H-shaped steel on the side is fixed on a support base on the resisting wall, a large spring for fixing the furnace column is locked after the furnace column is fixed, a spring nut is loosened, and a small spring in a corresponding combustion chamber area is loosened to a free state.

2) The middle (5) support is made of steel pipes and jacks,

1 row of supports are arranged from the machine side to the coke side in the transverse direction for every 4 flame paths; 2 rows of supports are uniformly arranged in the vertical furnace top area, one row of supports is arranged in the combustion chamber area from top to bottom at intervals of 1-1.5 meters, and no support is arranged at the 2 meters at the lowest part; 3-4 carbonization chambers are arranged at intervals, 1 upright rod is arranged at 6 flame paths at intervals, and brackets are welded on the upright rods to reinforce the support, so that the support forms a grid shape.

3) In the middle (1), 1 transverse expansion joint is reserved in each combustion chamber, 1 transverse expansion joint is reserved at the bottom of each carbonization chamber with the length of 1.5 meters in the middle carbonization chamber, 1 transverse expansion joint is reserved at the bottom of each carbonization chamber with the length of 1 meter in the side carbonization chamber, longitudinal expansion joints are reserved at two sides of the bottom of each carbonization chamber, and the bottom of each carbonization chamber needs to be preheated before being bricked.

3) In

Gaps with different sizes are reserved on the wall surfaces of the regenerator and the small flue due to nonuniform shrinkage during cooling, joint pointing treatment is required, gaps smaller than 2mm are not treated during joint pointing, the gaps with the size of 2-5mm are filled with silicon fire clay for pointing, the gaps with the size of 5-10mm are filled with silicon fire clay doped with aggregates, and gaps with the size of more than 10mm are filled with some broken brick slag besides the silicon fire clay doped with the aggregates; and after the guard plate brick is rebuilt, grouting treatment is carried out on the gap between the guard plate brick and the wall body.

5) The coal charging amount in the middle (2) is increased according to the stages of 85%, 90%, 95% and 100% of the normal coal charging amount, and the coke is stably discharged for 2-3 times after the coal charging amount is increased once.

Compared with the prior art, the invention has the beneficial effects that:

the method comprises the steps of heat preservation of adjacent combustion chambers in a demolition area, support of adjacent combustion chambers in the demolition area, long-time smoldering prevention of a braising furnace of adjacent carbonization chambers in the demolition area, replacement of bottom bricks of the carbonization chambers, repair of reserved cracks in a chute area, repair of reserved cracks in a regenerator, repair of reserved cracks in a small flue, repair of reserved cracks in a brick gas channel, control of furnace length and expansion of the newly built combustion chambers, guarantee of width and taper of the carbonization chambers between the demolition area and combustion chambers which are not demolished, guarantee of coincidence of an inclined channel port of the newly built combustion chamber and an inclined channel port of an original chute area, control of building of a newly built combustion chamber adjacent to the undeployed combustion chamber, furnace column reinforcement technology, fixation of a protection plate, reinforcement of a large vehicle track on the top of the furnace body, control of furnace baking of the newly built furnace body and control of coal charging and commissioning of the newly built carbonization chambers. Under the condition of non-stop production, the coke oven combustion chamber can be quickly disassembled in a high-quality large area and rebuilt, the problems of corrosion, cracking, perforation, deformation and the like of the wall of the combustion chamber can be solved, the leakage of the regenerator can be reduced, the heat accumulating type heat exchange capability can be improved, the phenomenon that the furnace body smokes and emits fire can be eliminated, the pollutant emission can be reduced, and the production is more energy-saving and environment-friendly. The method can be used for carrying out segmented overall overhaul on the coke oven with problems, so that the design capacity is quickly recovered, and the service life of the coke oven is prolonged by 8-10 years; for the 5.5 m 55-hole tamping drum coke oven, the maintenance fund is saved by at least 40 percent and the maintenance time is saved by at least 4 months compared with the in-situ production stopping overhaul; can create great economic benefit and social benefit for enterprises.

Drawings

Fig. 1 is a schematic view of a temporary greenhouse of the furnace roof truss car of the present invention.

FIG. 2 is a schematic view of the furnace column fixing and the rail reinforcement of the coal charging car of the present invention.

FIG. 3 is a schematic view of the invention with the area insulation support removed.

In the figure: 1-weather enclosure base 2-bottom beam 3-truss track 4-oblique beam 5-truss 6-greenhouse support 7-greenhouse roof 8-walking platform 9-coke oven top surface 10-furnace column 11-furnace roof cart track 12-steel pipe 13-channel steel 14-I-steel group 15-furnace wall 16-transverse pipe 17-upright post 18-thousand-gold top 19-asbestos felt 20-support channel steel 21-support pipe 22-flange 23-oblique channel 23

Detailed Description

The following further describes embodiments of the present invention in conjunction with the attached figures:

as shown in figures 1-3, a large-area uncovering maintenance method for a coke oven combustion chamber comprises a preparation stage, a dismantling stage, a building stage, an oven drying stage and a production stage.

Preparation stage

1. Cooling of combustion chamber

And synchronously cooling the combustion chamber to be dismantled, the braising furnace number combustion chamber, the buffer furnace number combustion chamber and the secondary buffer furnace number combustion chamber, wherein the temperature is not more than 60 ℃ every day. The combustion chamber and the carbonization chamber to be removed can be opened partially to see the fire hole cover and the smoke guide hole for cooling as required, when the temperature is reduced to 1200 ℃, the carbonization chamber to be removed starts to push the furnace empty, the procedure is carried out according to the coke pushing sequence, the furnace empty pushing sequence is carried out according to the actual production condition, and the furnace continues to be cooled after being pushed. The furnace wall temperature of the carbonization chamber at the dismantling side is kept to be not lower than 850 ℃ after the temperature of the braising furnace number combustion chamber, the buffer furnace number combustion chamber and the secondary buffer furnace number combustion chamber is reduced and then is kept.

2. Control of braising furnace number

During the braising, the charring chamber can burn coke to generate local high temperature if air enters the charring chamber, so that the wall surface of the charring chamber is nodulated to influence normal production, and measures are taken to prevent nodulation during the braising.

After the area is dismantled and the furnace is emptied, the braising furnace number carbonization chamber is sealed in positive pressure, and then the braising furnace is started after coal is charged. After the braising furnace is closed, the cover of smoke guide hole (coal charging hole) and the knife edge of furnace door must be checked frequently to prevent air from entering. The valve body turning plate corresponding to the braising furnace number ascending pipe is always kept in an open state, so that the raw coke gas in the gas collecting pipe at the later coking stage can flow back into the braising furnace number carbonization chamber, the positive pressure in the carbonization chamber is kept, and the air is prevented from entering. Discharging coke once in the braising furnace for about 45 days, sealing the coking chamber at positive pressure after discharging coke, and then charging the coal braising furnace until putting into production.

3. Water seal tank protection for gas collecting pipe, dust removing main pipe and smoke guiding vehicle

The gas collecting pipe is installed on the top surface of the furnace column through the pipe support, the support of the gas collecting pipe upper flap valve is also installed on the top surface of the furnace column, the height direction of the furnace column is basically unchanged, but the furnace column can move towards the furnace area when the furnace body is cooled and shrunk. The sliding marks are made on the supports of the gas collecting pipe support and the flap valve, the sliding condition is periodically checked in the furnace cooling process, the reason is found out and processed in time due to unsmooth sliding, and the smooth sliding is ensured.

The dust removal main pipe and the water seal groove of the smoke guide car are installed on the furnace column through the bracket, sliding marks are made on the bracket, sliding obstacles are removed, the sliding condition is periodically checked in the furnace cooling process, reasons can be found out and processed when the sliding is not smooth, and the sliding is ensured to be smooth.

4. Adjustment of sliding line of coke guide

Properly and outwards adjusting the sliding line of the coke guide in the maintenance area to prevent the coke guide sliding line racket from separating from the sliding line of the coke guide when the furnace column moves towards the furnace area during furnace cooling.

5. Roof cart rail reinforcement

As shown in figure 2, an I-steel group 14 welded by two 300mm I-steels is respectively arranged on two sides of each furnace top cart track 11, and two ends of the I-steel group 14 are respectively pressed on the surfaces of the two carbonization chambers outside the maintenance area by padding steel plates. And a channel steel 13 is welded at the position of each carbonization chamber between two I-shaped steel groups 14 of each furnace top cart rail 11 to drag and fix the furnace top cart rail 14.

Every 3-4 coking chambers, 1 group of supports are arranged between the bottom of the coking chamber at the machine side and the coke side and the I-steel group 14 to support the I-steel group 14, the lower part of the support is dragged by a jack, the lower part of the jack is pressed on a bottom brick of the coking chamber by a steel plate and a sleeper, and the height of the support is properly adjusted by the jack to prevent the elevation of the track from descending due to the cooling shrinkage of the regenerator. The middle of the I-steel groups at the two sides of the coke and the coke is fixedly supported by 1 steel pipe 12 and 1 lacing wire every 4-5 carbonization chambers, and the outer side of the I-steel group 14 is also fixedly supported by the steel pipe 12 and the lacing wire and the H-shaped steel of the fixed furnace column 10.

6. Ascending pipe dismantling and bridge pipe protecting

And after the carbonization chamber is emptied, closing a flap valve corresponding to the ascending pipe to be detached, reinforcing a bridge pipe guide seat, and detaching a butt flange of a high-pressure ammonia water valve pipeline on the bridge pipe. When the temperature of the carbonization chamber to be dismantled is reduced to 600 ℃, the ascending pipe, the bridge pipe and the water seal cover are integrally dismantled and are hoisted to the ground by a crane. After the ascending pipe is dismantled, the bridge pipe leading seat opening is covered tightly by environment-friendly ceramic fiber felt and sealed by fire clay, and the inspection treatment is carried out every day.

7. Rainproof shed and truss vehicle erection

As shown in fig. 1, a rain-proof shed base 1 is made of i-steel, the rain-proof shed base 1 is fixedly connected to the top surface 9 of the coke oven, a bottom beam 2 is fixedly connected to the rain-proof shed base 1, an oblique beam 4 is fixedly connected to the bottom beam 2, a cart track 11 on the top of the coke oven is fixed to the bottom beam 2, and a truss cart track 3 is arranged on the cart track 11 on the top of the coke oven. The greenhouse support 6 is fixedly connected to the rainproof greenhouse base 1, the greenhouse top 7 is fixedly connected to the greenhouse support 6, and the greenhouse top 7 is made of color steel tiles. The lower part of the shed roof 7 is provided with a walking platform 8.

And (4) building a rain-proof shed on the maintenance area, and draining rainwater outside the furnace area. The rain-proof shed can be movable, is built on the track 11 of the furnace top cart, is fixed with the track when in parking, and can also be fixed and is built on the reinforcing I-shaped steel group 14 of the track 11 of the furnace top cart. The truss car 5 is erected on the track 11 of the furnace top cart and used for hoisting construction refractory materials, and the truss car is fixed with the track when being parked.

8. Iron control during cooling

Before cooling: loosening foundation bolts of the furnace column of the uncovering combustion chamber, opening a brace groove of a transverse brace of the furnace column, well measuring original data of an iron piece and marking various sliding points, and installing a pressing plate and a spring on the front surface of the inclined flue.

When cooling: the large and small springs are adjusted to the specified tonnage larger than the production, and the tonnage of the spring on the front pressing plate of the inclined chute is kept consistent with that of the spring of the small furnace column. The large spring was adjusted once a day and the small spring was adjusted twice a week.

9. Furnace column reinforcement

After the ascending pipe is dismantled and before the refractory bricks are dismantled, the machine coke side furnace pillar is reinforced, and the displacement and deformation of the furnace pillar caused by the dismantling of the combustion chamber are prevented. The furnace column of the maintenance area and two normal furnace columns on each side of two sides of the maintenance area are welded together by H-shaped steel for reinforcing the furnace columns, and a sizing block is added in a concave part between the furnace columns and the H-shaped steel for full welding. If one side is a resistance wall, the H-shaped steel on the side is fixed on a bracket foundation on the resistance wall. After the furnace column is fixed, the large spring at the upper part of the fixed furnace column is locked, the spring nut is loosened, and the small spring corresponding to the combustion chamber area is loosened to a free state.

10. Securing of protective plates

The fixture is made of channel steel, a lead screw and a nut, the fixture is arranged on a hook bolt for fixing a furnace door frame, and a protection plate and the furnace door frame are fixed on a furnace column. The tightness of the clamp is checked regularly to ensure that the protection board is fixed firmly.

11. Door for taking off stove

Removing all machine coke side furnace doors outside the carbonization chamber except the side of the maintenance area before the furnace top is dismantled. When the furnace door is removed, the furnace door is firstly removed by a production vehicle and hung on the maintenance frame, and then the furnace door on the maintenance frame is hung on the ground by a crane. After the furnace door is removed, the furnace door is blocked by a special baffle to prevent slag from falling off, and the baffle is taken down when slag is discharged. And removing and mounting the baffle plate when the side carbonization chamber furnace door is nearly completed after the combustion chamber is removed.

12. Chute and adjustment brick and lamp head brick protection

Before the furnace top is dismantled, the ceramic fiber felt is dismantled into strips with the width of 50mm, the strips are put down from the vertical flue, the covering thickness of the inclined flue area is required to be at least 300mm, the inclined flue is prevented from being damaged and blocked by falling bricks, the adjusting bricks are protected, and meanwhile, the lamp cap bricks are covered by the environment-friendly ceramic fiber felt.

(II) demolition stage

1. Removal of furnace roof area

And (4) dismantling the refractory bricks passing through the top of the carbonization chamber and above by using an excavator, and throwing the waste bricks into the carbonization chamber from the smoke guide holes and the ascending pipe orifice. The excavator is lifted to the furnace top by a crane every day and then lifted down by the crane after operation, and the excavator does not walk in the area except for the demolition of the furnace top.

2. Combustion chamber demolition

After the furnace top area is dismantled, the excavator continues to dismantle the combustion chamber downwards. All the combustion chambers are synchronously and downwards dismantled in parallel, the dismantled refractory bricks are firstly put into the carbonization chamber and then are discharged to the middle of the track of the machine side cart from the carbonization chamber through a slag discharging iron plate on the machine side operating platform. The coke side does not discharge slag, and part of refractory bricks scattered on the coke side platform are also cleared to the middle of the machine side cart track and then are uniformly stacked to a designated position for centralized processing. Waste heat-insulating materials and refractory materials are separated, and the heat-insulating materials are packaged by woven bags and placed at specified positions for centralized treatment. The removed waste bricks are strictly forbidden to be placed into the combustion chamber, and the removed bricks are prevented from falling into the combustion chamber as much as possible.

3. Removing bottom brick of carbonization chamber

After the furnace wall of the combustion chamber is removed, the residual soil on the bottom of the carbonization chamber and the opening of the inclined channel is cleaned, then the asbestos on the opening of the inclined channel and the asbestos covering the lamp cap brick are taken down, the adjusting brick is recycled, and the brick on the bottom of the carbonization chamber is removed and cleaned. The bottom brick of the carbonization chamber with the support on the upper surface is temporarily not dismantled, and is dismantled after the support is dismantled.

4. Adjacent combustion chamber furnace wall heat preservation

In the dismantling process, 2 layers of aluminum silicate fiber felts with the thickness of 25-30mm are timely attached to the exposed wall surfaces of the adjacent combustion chambers on the two sides in a staggered manner for heat preservation, so that the temperature of the exposed wall surfaces is kept above 850 ℃. When the combustion chamber is dismantled to a height of 1.5 m from the bottom bricks of the carbonization chamber, the furnace door of the carbonization chamber is removed, and the exposed furnace mouth is adhered with cotton for heat preservation.

5. Furnace wall support of adjacent combustion chamber

As shown in FIG. 3, during the dismantling process, the furnace walls 15 exposed from the combustion chambers on both sides are supported from top to bottom by the supporters while being dismantled, so as to prevent the adjacent walls from freely deforming.

The 6 supporters are arranged in a row to support the furnace wall 15 exposed from the combustion chambers on the two sides from top to bottom, so that the adjacent wall is prevented from freely deforming.

The support comprises violently pipe 16, jack 19, support channel-section steel 20 and flange 22, violently pipe 16 adopts the iron pipe preparation, and is linked together through flange 22, and thousand golden tops 19 are installed at violently pipe 16 both ends, and the inboard rigid coupling of support channel-section steel 20 is on thousand golden tops 19, and the support channel-section steel 20 outside is supported on furnace wall 15. The asbestos felt 19 is attached to the furnace wall 15 and located between the supporting channel steel 20 and the furnace wall 15, and the asbestos felt 19 plays a role in heat preservation.

1 row of supports are arranged in every 4 flame paths from the machine side to the coke side in the transverse direction; 2 rows of supports are uniformly arranged in the vertical furnace top area, one row of supports is arranged in the combustion chamber area from top to bottom at intervals of 1-1.5 meters, and no support is arranged at the 2 meters at the lowest part.

An upright post 17 and a supporting tube 21 are arranged in a carbonization chamber for reinforcing and supporting a rail of a cart with a top to reinforce a support, 1 upright post 17 is arranged at every 6 flame paths, a jack 19 is used for supporting the lower part of each upright post, an iron plate is padded below the jack 19, and the iron plate is laid on a chute 23. The struts are reinforced by the pillars 17 to form a network shape, and the struts are prevented from deforming. After each layer of the support is installed, the hole width of each support position is measured and recorded, the hole width is periodically checked in the dismantling and building process, the tightness of the support is adjusted according to the checking result, and the hole width is kept unchanged.

6. Regenerator seal wall demolition

When the furnace is cooled, before the fire-eye brick is removed from the furnace top, the opening of the temperature measuring hole part of the heat storage chamber to be detached from the machine and the coke side sealing wall top is formed, and the heat storage chamber is cooled. Before the heat storage chamber is maintained, a maintenance operation platform is erected at the heat storage chamber to be maintained in the flue corridor, and then the heat storage chamber sealing wall is manually dismantled.

7. Checker brick of regenerator

And after the sealing wall of the regenerator is removed, digging out all the checker bricks and the grate bricks in the regenerator, and removing a layer of protection plate bricks.

(III) masonry stage

1. Bottom masonry of carbonization chamber

The reserved inclined duct is treated before the carbonization chamber bottom is built, gaps with different sizes are reserved on the inclined duct due to uneven shrinkage during cooling, gaps smaller than 2mm are not treated during building, gaps with the size of 2-5mm are subjected to pointing filling by using silicon fire clay, gaps with the size of 5-10mm are subjected to filling by using silicon fire clay doped with aggregates, and gaps with the size of more than 10mm are filled with some broken brick slag besides the silicon fire clay doped with the aggregates.

And building according to the actual size of the removed inclined chute area, and reserving an expansion joint.

According to the expansion rate of the tested silica bricks, 1 transverse expansion joint is reserved in each combustion chamber, 1 transverse expansion joint is reserved at the bottom of each carbonization chamber with the length of 1.5 meters in the carbonization chamber at the middle part, and 1 transverse expansion joint is reserved at the bottom of each carbonization chamber with the length of 1 meter in the carbonization chamber at the side. The bottom bricks of the side carbonization chambers need to be preheated before being built.

And cleaning and building the bottom bricks of the carbonization chamber which are supported and pressed after the support is removed.

2. Masonry defensive line of combustion chamber

Arranging combustion chamber control lines at the bottom of the carbonization chambers to ensure the width and the taper of each carbonization chamber, and reducing the width of the outermost side of the two combustion chambers on the edge to ensure the width and the taper of the carbonization chamber on the edge; the central lines of the coking chambers and the combustion chambers are parallel to each other and are perpendicular to the central line of the coke oven (or the cart rail on the coke side).

When the furnace length is set off, the machine and coke sides are respectively properly extended by taking the center of the combustion chamber as a reference, but the length of the machine and coke sides is smaller than the length of an actual chute area, and the positions of the openings of the chutes after rearrangement are deviated from the positions of the openings of the actual chutes to the center of the combustion chamber. When the combustion chamber is built, the furnace length of the lower part at 1/3 height is unchanged according to the paying-off length, the furnace length of the upper part at 2/3 height is gradually reduced, and the furnace length of the uppermost layer of the combustion chamber is reduced to be the same as the original value. And drawing the thickness of the mortar containing gap of the height control line built on each layer on the protective plate according to the original value when the furnace length is set.

3. Combustion chamber masonry

When the furnace wall of the combustion chamber is built, the furnace wall is strictly built according to the discharged control line, so that the vertical flame path is protected, and mud and sundries are prevented from falling into the vertical flame path. And (3) fully building all masonry slurry, ensuring the verticality according to the standard acceptance of Industrial furnace masonry engineering construction acceptance standard, wherein the mortar joint thickness meets the requirement. The material is transported by the platform during the lower part building and the material is transported by the furnace top during the middle and upper part building. And 4 hours after each combustion chamber is built, preparing materials on the combustion chambers.

When the ramp opening is built, part of bricks can block the ramp opening in the ramp area, and the ramp opening bricks of the combustion chamber are processed to completely expose the ramp opening in the ramp area without damaging the position for placing the adjusting bricks.

When the furnace wall of the combustion chamber is built, the furnace wall is strictly built according to the discharged control line, all building needs to be full of slurry, and the thickness, perpendicularity and flatness of the mortar joint are accepted according to the Standard of Industrial furnace building engineering acceptance Standard.

The elevation of one side close to the undetached combustion chamber is higher than that of the other side due to uneven cooling shrinkage of a chute area at the lower part of a new combustion chamber adjacent to the undetached combustion chamber, the bottom of the lower side is padded with 3mm thick felt paper during masonry, the felt paper is normally plastered for masonry, and if the wall of the combustion chamber is not flat, two layers of bricks are built and then padded with 3mm thick felt paper until the upper part of the combustion chamber is horizontal.

Because the height of the chute zone machine and the coke side furnace end in the non-uniform cooling shrinkage dismantling area is lower than the height of the middle mark of the furnace, the method for filling the felt paper is also adopted for leveling during building.

4. Furnace roof area masonry

When the overhead bricks of the side carbonization chamber are built, because the newly built combustion chamber is not expanded much lower than the old combustion chamber, battens with proper height are padded between the overhead bricks of the carbonization chamber and the top of the new combustion chamber, and the inclination of the overhead bricks is reduced.

The last two layers of the furnace top surface and the last two layers of the fire observation hole wall are not built during the whole building, and the leveling building is carried out after the drying furnace is finished.

5. Set up the jumping stand

A jump frame is set up in the carbonization chamber, and the length is from the side furnace column to the coke side furnace column. The machine and coke sides are respectively fixed on corresponding furnace columns, and supports are arranged in the carbonization chamber. The height of each layer of the horizontal jumping stand is 1.2-1.5 m, and an iron jumping board is paved on the horizontal jumping stand. The height of the jump frame increases with the height of the combustion chamber wall.

6. Wall surface support

When a new wall is built, two carbonization chambers on each side are supported and protected in a group at intervals of 4 flame paths, the new wall is supported after being built for 1-2 days, and the supports are tightly held by hands so as to ensure that the newly built furnace wall and the adjacent old wall are not deformed, pay attention to monitoring the perpendicularity of the furnace wall and adjust the tightness of the supports.

And after the carbonization chambers in front of the oven are cleaned, performing a group of support protection in all the carbonization chambers at intervals of 4 flame paths, and taking out all the supports after the oven is dried.

7. Wall surface heat preservation

And 2 layers of aluminum silicate fiber felts with the thickness of 25-30mm are respectively attached to the wall surface of the newly built side combustion chamber close to the old combustion chamber in a staggered manner, so that the wall surface is insulated, and the side combustion chamber is built while being attached.

8. Carbonization chamber bottom protection

After the bottom bricks of the carbonization chamber are built, the asbestos felt and the iron springboard are paved on the bottom bricks for protection, and after the bottom bricks of the carbonization chamber on the sides are built, the bottom bricks are placed for 24 hours, and then the asbestos felt and the iron springboard are paved.

9. Side combustion chamber temperature control

After the chute opening is built, the chute opening of the side combustion chamber leading to the production regenerative chamber is blocked by asbestos felt, cold air in the environment is prevented from entering the production regenerative chamber and hot air in the production regenerative chamber enters the side combustion chamber to be built, and the asbestos felt is taken out when the end of the furnace baking or the furnace baking is finished; the upper opening of the lamp holder brick of the side combustion chamber is covered tightly by thick felt paper. In the building process of the side combustion chambers, the ash receiving plate on the upper surface of each combustion chamber needs to be opened when the side combustion chambers are off duty to keep airflow smooth, and if bricks are placed on the upper surfaces of the side combustion chambers, the cover plates on the side combustion chambers need to be padded for ventilation or iron springboards are used as the cover plates.

10. Baking oven fire bed and carbonization chamber sealing wall masonry

After the carbonization chamber is cleaned and supported, a baking furnace fire bed and a carbonization chamber sealing wall are built.

11. Wall surface treatment of regenerative chamber and small flue

Gaps with different sizes are reserved on the regenerator and the small flue wall surface due to nonuniform shrinkage during cooling, joint pointing treatment is required, the gap smaller than 2mm is not treated during joint pointing, the gap with the size of 2-5mm is subjected to jointing filling by using silicon fire clay, the gap with the size of 5-10mm is subjected to filling by using silicon fire clay doped with aggregate, and the gap with the size of more than 10mm is subjected to filling by using silicon fire clay doped with aggregate and also is subjected to filling of a certain amount of broken brick slag.

Local digging and repairing are carried out on the seriously damaged furnace wall and the damaged part of the pipe brick of the gas pipeline, and a sufficient horizontal seam expansion seam is reserved during digging and repairing.

And after the guard plate brick is rebuilt, grouting treatment is carried out on the gap between the guard plate brick and the wall body.

12. Grate brick and checker brick heavy pendulum

After the heat storage chamber and the small flue wall surface are treated, the grate bricks and the lattice bricks are repeatedly swung according to the requirements of design drawings, and after the repeated swinging is finished, brick covering and slag receiving iron plates are placed on the lattice bricks on the two sides of the machine and the coke and face the inner 1-32# vertical flame path.

13. Regenerator closure wall rebuild

And re-building the regenerator sealing wall, reserving a hole at the upper part of the sealing wall for extracting the slag receiving iron plate, and extracting the iron plate before baking the furnace to seal the reserved hole. And (3) coating heat insulation materials on the outer surface of the sealing wall in a hot state.

(IV) oven drying stage

1. Installation of oven gas pipeline

The coke oven gas is used for baking, and the baking gas is led out from a return gas pipeline of the basement to be divided into a machine gas pipeline and a coke gas pipeline on two sides and is connected through a manual gate valve. A furnace gas pipeline of the drying furnace is erected on a furnace column above a coke side waste gas shutter by using an angle iron welding bracket, the front end of the pipeline is provided with a pressure measuring port and a cleaning port, and the tail end of the pipeline is provided with an explosion-proof, diffusing, water draining and sampling device. And opening holes in the oven gas pipeline in front of each maintained carbonization chamber, and welding oven gas branch pipes, wherein each branch pipe penetrates through the basement upwards from the space between the oven columns and then passes through the operation platform at the coke side, and is connected with a flange mounting hole plate.

2. Mounting baking oven burner

The coal gas burner is installed in the oven hole of the sealing wall of the carbonization chamber before the oven is dried and connected to the coal gas branch pipe of the oven by a rubber pipe. The end of the oven gas branch pipe is provided with an oven orifice plate for controlling the gas flow.

3. Temperature measuring system for mounting drying oven

A type K thermocouple was inserted in the management flame path of each row of combustion chambers for maintenance, for measuring the temperature of the combustion chambers during the oven. The thermocouple can be connected to a computer automatic temperature measuring system for automatic temperature measurement, and can also be used for manual temperature measurement by a K-type meter.

4. Oven temperature rise control

When the baking furnace is just started, the baking furnace burners of the two carbonization chambers are not ignited, the temperatures of the two combustion chambers are controlled to rise by heat transfer of the adjacent hot walls, and the baking furnace burners are ignited when the temperatures of the two combustion chambers rise by heat transfer. When the temperature of the two combustion chambers is raised to 400 ℃, the cotton covered on the inclined channel opening in the combustion chamber is taken out by a long hook.

5. Baker iron control

After the furnace is dried, the spring of the pressure plate on the front surface of the inclined chute is adjusted every day to keep the corresponding tonnage pressure and promote the gap absorption in the inclined chute. Monitoring the change of a gap between a furnace shoulder of the combustion chamber and the protection plate every day, unlocking the large spring after the combustion chamber is expanded and contacted with the protection plate, recovering the tonnage of the large spring and the tonnage of the small spring, removing the furnace column for reinforcement and fixing the protection plate, adjusting the size of the spring, the jackscrew of the protection plate and the like, and monitoring the change of the furnace length, the curvature, the furnace height and the like.

6. Thermal engineering

And after the temperature of the baking furnace reaches 600 ℃, performing thermal-state construction according to the requirements of a baking furnace scheme, wherein the thermal-state construction comprises furnace top grouting, fine mineral powder hooking of gaps between a protection plate and a furnace door frame, protection plate grouting, small furnace head building, high-low pressure ammonia water recovery of riser installation, brace groove filling of heat preservation powder, furnace top sleeper seat recovery, furnace top surface cylinder brick building, regenerator wall sealing heat preservation, waste gas shutter two fork part and root sealing, brick gas channel guniting and clearing.

7. Internal heating

When the temperature of the oven reaches 800 ℃, the interior of the basement is heated, the temperature is continuously raised to meet the requirement of coal charging, and the heating of the oven gas system is stopped after the interior is heated.

8. Demolish baker temperature measurement system

And (4) after internal heating is carried out, removing the oven temperature measurement system and measuring the temperature by using an infrared pyrometer.

9. Gas system for detaching oven

And (4) after stopping heating of the oven gas system, replacing the gas in the oven gas pipe with nitrogen, and removing the oven gas pipe after replacement.

10. Dismantle the charing chamber and seal the wall

And (4) removing the sealing wall of the carbonization chamber and the oven fire bed after internal heating, taking out the support in the carbonization chamber, cleaning the bottom of the carbonization chamber, and hanging the oven door.

(V) putting into production

1. Initial coal charge

And (3) checking before coal charging to confirm that no impurities exist in the carbonization chamber, finishing the installation and connection of the furnace door, the ascending pipe and the high-low pressure ammonia water, and completing the coal charging of all the carbonization chambers within 24 hours after the ascending pipe is sealed by water and the high-low pressure ammonia water is sprayed and sunned to check to be qualified. The coking time of the first round is 1.5 coking cycles, and the standard temperature is adjusted. The coal loading of the first round is 80% of the normal coal loading.

2. Increasing the coal loading amount to reach the yield.

When the coke pushing current is stable and is close to the normal coke pushing current, the standard temperature can be gradually increased, the coking time is shortened, the coal charging amount is increased according to stages of 85%, 90%, 95% and 100% of the normal coal charging amount, and coke is stably discharged for 2-3 turns after the coal charging amount is increased once, so that the newly repaired furnace wall is fully rubbed, and the coke discharging resistance is reduced.

Under the condition of no stop of production, the invention can rapidly dismantle the coke oven combustion chamber in high quality and large area and rebuild the coke oven combustion chamber, repair the problems of corrosion, cracking, perforation, deformation and the like of the wall of the combustion chamber, reduce the blowby condition of the regenerative chamber, improve the regenerative heat exchange capability, eliminate the smoke and fire of the furnace body, reduce the emission of pollutants and ensure that the production is more energy-saving and environment-friendly. The method can be used for carrying out segmented overall overhaul on the coke oven with problems, so that the design capacity is quickly recovered, and the service life of the coke oven is prolonged by 8-10 years; for the 5.5 m 55-hole tamping drum coke oven, the maintenance fund is saved by at least 40 percent and the maintenance time is saved by at least 4 months compared with the in-situ production stopping overhaul; can create great economic benefit and social benefit for enterprises.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. A large-area uncovering maintenance method for a combustion chamber of a coke oven is characterized by comprising a preparation stage, a dismantling stage, a building stage, an oven drying stage and a production stage:

1) A preparation stage:

(1) cooling the combustion chamber: synchronously cooling a combustion chamber to be dismantled, a braising furnace number combustion chamber, a buffer furnace number combustion chamber and a secondary buffer furnace number combustion chamber, and then preserving heat;

(2) controlling the number of the braising furnace: after the furnace is pushed empty in the dismantling area, positive pressure sealing is carried out on the braising furnace number carbonization chamber, then coal charging is carried out, the braising furnace is started, a smoke guide hole cover, a coal charging hole cover and a furnace door knife edge are sealed after braising, and a valve body turning plate corresponding to a braising furnace number ascending pipe is always kept in an open state;

(3) protection of a gas collecting pipe, a dust removing main pipe and a water seal tank of a smoke guide vehicle: sliding marks are made on supports of the gas collecting pipe support and the flap valve, on the dust removal main pipe bracket and on the water seal tank bracket of the smoke guide vehicle, so that sliding obstacles are removed, and the sliding condition is periodically checked in the furnace cooling process to ensure smooth sliding;

(5) reinforcing the track of the furnace top cart: reinforcing the cart track at the top of the demolition area by combining a section steel group and a vertical support;

(6) dismounting an ascending pipe and protecting a bridge pipe: after the maintenance carbonization chamber is emptied, cooling to below 600 ℃, integrally removing the ascending pipe, the bridge pipe and the water sealing cover, tightly covering the bridge pipe leading seat opening with environment-friendly ceramic fiber felt and sealing with fire clay;

(7) erecting a rain-proof shed and a truss: building a rain-proof shed on the maintenance area, and discharging rainwater outside the furnace area;

(8) controlling an iron part during cooling: before cooling: loosening the foundation bolts and opening the brace ditch; when cooling: adjusting the large spring and the small spring to a specified tonnage larger than the production tonnage;

(9) furnace column reinforcement: after the ascending pipe is dismantled, before the refractory bricks are dismantled, the furnace columns of the maintenance area and two furnace columns on each side of two sides of the maintenance area are welded together by profile steel;

2) And (3) a dismantling stage:

3) A building stage:

(1) building the bottom of the carbonization chamber:

gaps of chutes with the thickness of 2-5mm are filled with silicon fire clay in a pointing way, gaps of chutes with the thickness of 5-10mm are filled with silicon fire clay mixed with aggregate, and gaps of chutes with the thickness of more than 10mm are filled with broken brick slag besides the silicon fire clay mixed with the aggregate;

building according to the actual size of the removed inclined chute area, and reserving an expansion joint;

(2) laying and setting out a combustion chamber: arranging combustion chamber control lines at the bottom of the coking chambers to ensure the width and taper of each coking chamber, wherein the central lines of each coking chamber and each combustion chamber are parallel to each other and are vertical to the central line of the coke oven or the cart rail at the coke side of the machine;

(3) building a combustion chamber: the slurry is required to be full for all masonry, and the thickness, verticality and flatness of mortar joints are accepted according to the standard acceptance of Industrial furnace masonry engineering construction acceptance;

the elevation of one side close to the undetached combustion chamber is higher than that of the other side due to uneven cooling shrinkage of a chute area at the lower part of the new combustion chamber adjacent to the undetached combustion chamber, 3mm thick felt paper is padded at the bottom of the lower side during building, the upper surface of the felt paper is normally plastered and built, and if the wall of the combustion chamber is not flat, 3mm thick felt paper is padded until the upper part of the combustion chamber is horizontal after two layers of bricks are built;

(4) building a furnace top area: the last two layers of the furnace top surface and the last two layers of the fire observation hole wall are not built during integral building, and the building is leveled after the furnace drying is finished;

(6) supporting the wall surface: when a new wall is built, two carbonization chambers on each side are internally supported and protected by a group at intervals of 4 flame paths; cleaning the carbonization chambers before baking, performing a group of support protection in all carbonization chambers at intervals of 4 flame paths, and taking out all supports after baking;

wall surface treatment of a regenerative chamber and a small flue: pointing the wall surfaces of the regenerator and the small flue, locally patching the seriously damaged wall surfaces or the damaged parts of the pipe bricks of the gas pipeline, and grouting the gaps between the protective plate bricks and the wall body after the protective plate bricks are rebuilt;

4) A furnace drying stage:

(3) installing a temperature measuring system of the oven: a thermocouple is inserted into a management flame path of each row of combustion chambers for temperature measurement of the oven;

(8) dismantling a temperature measurement system of the baking oven: after internal heating, the temperature measurement system of the baking oven is removed and the temperature is measured by an infrared pyrometer;

C, detaching a carbonization chamber sealing wall: removing the sealing wall of the carbonization chamber and the oven fire bed after internal heating, taking out the support in the carbonization chamber, cleaning the bottom of the carbonization chamber, and hanging the oven door;

5) A production stage:

(1) initially charging coal: coal charging of all the coking chambers is completed within 24 hours, the coking time of the first round is 1.5 coking cycles, and the coal charging amount of the first round is 80 percent of the normal coal charging amount;

2. The large-area uncovering maintenance method for the coke oven combustion chamber according to claim 1, characterized in that in the step 1) (5) an I-steel group welded by two I-steels is respectively arranged at two sides of each furnace top cart track, and two ends of the I-steel group are respectively pressed on the surfaces of two hole carbonization chambers outside the maintenance area by padding steel plates;

3. The large-area uncovering maintenance method for the coke oven combustion chamber, according to the claim 1, is characterized in that, after the ascending pipe (9) in the step 1) is removed and before the firebricks are removed, the coke oven side oven column is reinforced, the oven column is reinforced by welding the oven column in the maintenance area and two oven columns on each side of two sides of the maintenance area together through H-shaped steel, and the recessed part between the oven column and the H-shaped steel is filled with sizing blocks for full welding;

if one side is a resisting wall, the H-shaped steel on the side is fixed on a support base on the resisting wall, after the furnace column is fixed, a large spring on the upper part of the fixed furnace column is locked, a spring nut is loosened, and a small spring in a corresponding combustion chamber area is loosened to a free state.

4. The large-area uncovering maintenance method for the combustion chamber of the coke oven as claimed in claim 1, wherein 2) the support (5) is made of steel pipes and jacks;

1 row of supports are arranged from the machine side to the coke side in the transverse direction for every 4 flame paths; 2 rows of supports are uniformly arranged in the area of the vertical furnace top, one row of supports is arranged in the combustion chamber area from top to bottom at an interval of 1-1.5 meters, and no support is arranged at the 2 meters of the lowest part; 3-4 carbonization chambers are arranged at intervals, 1 upright rod is arranged at 6 flame paths at intervals, and brackets are welded on the upright rods to reinforce the support, so that the support forms a grid shape.

5. The large-area uncovering maintenance method for the coke oven combustion chambers, according to the claim 1, is characterized in that 3) (1) each combustion chamber is provided with 1 transverse expansion joint, the carbonization chamber at the middle part is provided with 1 transverse expansion joint at the bottom of the carbonization chamber with the length of 1.5 meters, the carbonization chambers at the sides are provided with 1 transverse expansion joint at the bottom of the carbonization chamber with the length of 1 meter, the two sides of the bottom of each carbonization chamber are provided with longitudinal expansion joints, and the bottom bricks of the carbonization chambers at the sides need to be preheated before being constructed.

6. The large-area uncovering maintenance method for the coke oven combustion chamber as claimed in claim 1, characterized in that 3)

Gaps with different sizes are reserved on the regenerator and the small flue wall surface due to nonuniform shrinkage during cooling, joint pointing treatment is required, the gap smaller than 2mm is not treated during joint pointing, the gap with the size of 2-5mm is subjected to jointing filling by using silicon fire clay, the gap with the size of 5-10mm is subjected to filling by using silicon fire clay doped with aggregate, and the gap with the size of more than 10mm is subjected to filling by using silicon fire clay doped with aggregate and also is subjected to filling of a certain amount of broken brick slag; and after the guard plate brick is rebuilt, grouting treatment is carried out on the gap between the guard plate brick and the wall body.

7. The large-area uncovering maintenance method for the combustion chamber of the coke oven as claimed in claim 1, characterized in that the coal charging amount of 5) (2) is increased according to stages of 85%, 90%, 95% and 100% of the normal coal charging amount, and the coke is stably discharged for 2-3 times after the coal charging amount is increased once.