CN112898993A - Method for repairing small flue of coke oven - Google Patents
Method for repairing small flue of coke oven Download PDFInfo
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- CN112898993A CN112898993A CN202110060684.4A CN202110060684A CN112898993A CN 112898993 A CN112898993 A CN 112898993A CN 202110060684 A CN202110060684 A CN 202110060684A CN 112898993 A CN112898993 A CN 112898993A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B29/00—Other details of coke ovens
- C10B29/06—Preventing or repairing leakages of the brickwork
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
Abstract
The application provides a method for repairing a small flue of a coke oven, belonging to the technical field of coke oven maintenance. The method for repairing the small flue of the coke oven comprises the following steps: and smearing the first repairing material to a gap between a double-fork joint of a connecting pipe of the exchange shutter and a lining of the small coke oven flue from the inside of the small coke oven flue, and pouring the second repairing material into the small coke oven flue so that the second repairing material flows to a brick seam at the bottom of the small coke oven flue. The gap between the small flue of the coke oven and the double-fork socket of the exchange shutter connecting pipe can be repaired more stably by repairing the small flue of the coke oven from the inside of the small flue of the coke oven, so that air is sucked into the small flue of the coke oven filled with blast furnace gas to be ignited and the blast furnace gas is leaked when the ascending air flow is cut off. Meanwhile, the gaps at different parts are filled by two methods of smearing and perfusion, so that the gaps inside the small flue of the coke oven can be completely filled by the repairing material, and the small flue of the coke oven is prevented from leaking and catching fire.
Description
Technical Field
The application relates to the technical field of coke oven maintenance, in particular to a method for repairing a small flue of a coke oven.
Background
In the coke oven with coke oven gas downward spraying and reheating functions, a small flue of the coke oven is positioned at the lower part of a heat accumulation chamber and is a channel for connecting the heat accumulation chamber and a double-fork socket of a connecting pipe of an exchange shutter. The coke oven small flue mainly has the following functions: during the ascending airflow, air and blast furnace gas are uniformly distributed into the heat storage chamber through the grate bricks; when the air current falls, the waste gas from the heat storage chamber is collected and discharged to the waste gas shutter.
When blast furnace gas is used for heating, the coke oven combustion system is negative pressure except for the observation hole, so that air is inevitably leaked as long as a gap exists at the double-fork bearing interface of the connecting pipe of the exchange shutter. Air is sucked into a blast furnace gas flue from a small flue bearing opening and a base top plate surface expansion sliding gap to be ignited, so that the temperature of the small flue is higher, lining bricks, grate bricks and an exchange shutter of the small flue can be burned out seriously, the air excess coefficient (alpha coefficient) is higher, the temperature of a furnace end is lower, the coking heat consumption is increased, and great difficulty is brought to the thermal regulation; when the small flue is in positive pressure in abnormal conditions, blast furnace gas can become a part with an untight interface from the small flue and leak to corridors at two sides from a sliding gap of the foundation top plate, thereby bringing great threat to personal safety.
Disclosure of Invention
The application provides a method for repairing a small flue of a coke oven, which can stably repair a gap between the small flue of the coke oven and a double-fork socket of a connecting pipe of an exchange shutter, and prolong the repair period of the small flue of the coke oven.
The embodiment of the application is realized as follows:
in a first aspect, the present application provides a method for repairing a coke oven chimney flue for connecting an exchange shutter connecting pipe duplex bellmouth and a regenerator, comprising:
and smearing the first repairing material to a gap between a double-fork joint of a connecting pipe of the exchange shutter and a lining of the small coke oven flue from the inside of the small coke oven flue, and pouring the second repairing material into the small coke oven flue so that the second repairing material flows to a brick seam at the bottom of the small coke oven flue.
In the technical scheme, the small coke oven flue is repaired from the inside of the small coke oven flue, so that the gap between the small coke oven flue and the double-fork socket of the exchange shutter connecting pipe can be repaired more stably, and air is sucked into the small coke oven flue filled with blast furnace gas to be ignited and the blast furnace gas is leaked when ascending air flow is cut off. And after the coke oven is normally produced and operated, the oven body expands, and air cannot enter the small flue of the coke oven from the expansion sliding gap between the receiving port of the small flue of the coke oven and the surface of the base top plate.
Meanwhile, the gaps at different parts are filled by two methods of smearing and pouring, so that the gaps at the inner side and the bottom of the small flue of the coke oven can be completely filled by the repairing material, and the small flue of the coke oven is prevented from leaking and catching fire.
In combination with the first aspect, in a first possible example of the first aspect of the present application, the first repair material and the second repair material each include a powder material, and the powder material includes 40 to 60 wt% of high alumina fire clay, 15 to 25 wt% of clay fire clay, 5 to 15 wt% of aluminate cement, and 15 to 25 wt% of clay brick slag aggregate.
In the above examples, the first repair material and the second repair material of the present application have good shrinkage, no crack, corrosion resistance, and high temperature resistance. Meanwhile, the first repairing material and the second repairing material have good cohesiveness and good construction performance, namely good water retention performance, and can be kept in a uniform state without precipitation.
With reference to the first aspect, in a first possible example of the first aspect of the present application, the water content of the first repair material is 25 to 30 wt%, and the water content of the second repair material is 35 to 40 wt%.
In the above example, the first repair mass for plastering has high consistency and viscosity, and can dry up within the plastering time to achieve the required plastering thickness for repairing the brick joints and the mortar in the brick joints is full; the second repair material for perfusion has lower consistency and viscosity, can flow to brick joints at the bottom of each small flue of the coke oven under the action of gravity and is filled fully.
In a first possible example of the first aspect of the present application in combination with the first aspect, the alumina content of the high alumina fire clay is 48 wt% or more.
Optionally, the refractoriness of the high-aluminum fire clay is 1750-1790 ℃.
Optionally, the refractoriness under load of the high-aluminum fire clay is 1420-1500 ℃.
In the above example, the high-alumina fire clay is added into the repair material, so that the repair material has good construction repair smearing performance, and further the bonding force, the erosion resistance, the wear resistance and the high temperature resistance of the repair material are enhanced. Thereby easily obtaining the required thickness of the refractory brick seams and bonding the patching material into a compact whole.
In a first possible example of the first aspect of the present application in combination with the first aspect, the clay clinker comprises 60 to 80 wt% of calcined clay clinker and 20 to 40 wt% of raw clay.
Optionally, the content of alumina in the clay fire clay is 30-46 wt%.
In the above example, the clay fire clay is added to the repair material to increase the adhesion rate of the repair material and ensure that the repair material can achieve good adhesion performance.
In a first possible example of the first aspect of the present application in combination with the first aspect, the aluminate cement includes 50 to 70 wt% of monocalcium aluminate.
In the above example, the addition of aluminate cement to the repair mix can cause the repair mix to harden.
In a first possible example of the first aspect of the present application in combination with the first aspect, the particle size of the clay brick slag aggregate is 3mm or less.
Optionally, 75-85 wt% of particles in the clay brick slag aggregate have a particle size of 2-3 mm.
In the above example, the clay brick slag aggregate is added into the mending material, so that moisture in the mending material can be rapidly discharged during drying and sintering of the mending material, cracks generated after drying and sintering are reduced, the cohesiveness and strength are increased, the hanging material is firm, the mending is smooth, and no cracks or bubbles exist.
With reference to the first aspect, in a first possible example of the first aspect of the present application, the repair material is applied to the gap between the two-pronged socket of the exchange shutter connection pipe and the lining of the coke oven small flue from the inside, and after the exchange shutter is closed, the upper cover plate of the cleaning hole of the exchange shutter connection pipe is removed, and the repair is performed from the inside of the coke oven small flue through the cleaning hole.
With reference to the first aspect, in a first possible example of the first aspect of the present application, after the upper cover plate of the cleaning hole of the exchange shutter connection pipe is removed, the bottom of the coke oven small flue and the gap between the two-pronged receiving port of the exchange shutter connection pipe and the lining of the coke oven small flue are cleaned through the cleaning hole.
With reference to the first aspect, in a first possible example of the first aspect of the present application, the gap between the exchange shutter connection pipe bifurcated socket and the inner lining of the coke oven small flue is filled with asbestos cord before the first repair material is applied from inside to the gap between the exchange shutter connection pipe bifurcated socket and the inner lining of the coke oven small flue.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic view from a first perspective of a small flue of a coke oven according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a second perspective view of a small flue of a coke oven according to an embodiment of the present application.
Icon: 100-a regenerator; 200-coke oven small flue; 201-grate brick; 202-small flue lining brick; 300-exchange shutter connection pipe; 310-upper cover plate; 400-gap.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Referring to fig. 1 and 2, a small flue 200 of a coke oven is a channel connecting a regenerator 100 and an exchange shutter connecting pipe 300 with a double-fork socket, and is used for uniformly distributing air and blast furnace gas into the regenerator 100 through a grate brick 201 during ascending gas flow; the exhaust gas from the regenerator 100 is collected and discharged to the exhaust gas shutter in the downward flow.
The coke oven gas downward-spraying reheating coke oven waste gas shutter transmits exchange, the sliding force of an exchange carrying rod enables a double-fork joint of an exchange shutter connecting pipe 300 and a small flue 200 of a coke oven to be cracked and a waste gas disc to be deviated, a gap 400 generated between a joint of an exchange shutter connecting elbow pipe joint and a small flue lining brick 202 is large, and the cracking and falling of the packing of the double-fork joint of the exchange shutter connecting pipe 300 are easy to cause. The asbestos cord of the two-pronged socket of the exchange shutter connection tube 300 is difficult to fill tightly, especially at the bottom and inside the two-pronged socket. The coke oven masonry inevitably has residual expansion in the baking oven and normal production process, so that the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the lining of the small flue 200 of the coke oven is larger and larger. Air is sucked into the flue from the bellmouth of the small flue 200 of the coke oven and the expansion sliding gap 400 of the base top plate surface, the air and the coal gas are mixed to burn in advance, and the small flue 200 of the coke oven leaks and catches fire.
However, the gap 400 generated between the double-fork socket of the coke oven exchange shutter connecting pipe 300 and the small flue lining brick 202 is large, so that the blowby repair of the small flue 200 of the coke oven is difficult to implement in practice, and the blowby fire of the small flue 200 of the coke oven cannot be eliminated.
At present, the repair method of spray repair and repair of the exterior of the two-fork socket of the exchange shutter connecting pipe 300 is generally adopted. But the repairing method has short repairing period and poor effect;
the method for repairing the small flue of the coke oven according to the embodiment of the present application is specifically described as follows:
the application provides a method for repairing a small flue of a coke oven, which comprises the following steps: and smearing the first repairing material to a gap 400 between a double-fork socket of the exchange shutter connecting pipe 300 and a lining on the side edge of the coke oven small flue 200 from the inside of the coke oven small flue 200, and pouring the second repairing material into the coke oven small flue 200 so that the second repairing material flows to a brick seam at the bottom of the coke oven small flue 200.
In the process of building the coke oven, in order to ensure that the coke oven masonry can reliably expand and slide along the length direction of the carbonization chamber during oven drying and normal production, a sliding layer is arranged on the basic top plate. When the compressed air is used for blowing, dust is obviously seen to come out from the exchange shutter connecting pipe 300 and the furnace protection iron column part, and the bottom of the exchange shutter connecting pipe 300 and the outer part of the furnace protection iron column part cannot be repaired.
According to the present invention, the gap 400 between the coke oven small flue 200 and the two-pronged receiving opening of the exchange shutter connecting pipe 300 can be repaired more stably by repairing the coke oven small flue 200 from the inside of the coke oven small flue 200, thereby preventing the air from being sucked into the coke oven small flue 200 filled with the gas of the blast furnace to catch fire and the gas leakage of the blast furnace when the updraft is flowing upward. And after the coke oven is normally produced and operated, the oven body expands, and air cannot enter the small flue 200 of the coke oven from the bellmouth of the small flue 200 of the coke oven and the expansion sliding gap 400 of the base top plate surface.
However, the inner space of the two-prong socket of the exchange shutter connection pipe 300 is narrow, which is inconvenient for repair. In the prior art, a spray repair method is adopted, the upper cover plate 310 of the double-fork socket of the exchange shutter connecting pipe 300 is disassembled to clean holes, the spray repair position cannot be seen, and the grate bricks 201 of the small flue 200 of the coke oven sucked by repair materials are easy to block. Meanwhile, the gunning material is difficult to block the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small flue 200 of the coke oven.
The application fills the gaps 400 at different positions by two methods of smearing and perfusion, and is simple and convenient to operate. Therefore, the gaps 400 in the small coke oven flue 200 can be completely filled with the repair material, and the small coke oven flue 200 is prevented from leaking and catching fire.
The existing repair material has large shrinkage and more cracks. The mending material works at the temperature of 250-450 ℃, so that the mending material has poor resistance to chemical erosion of heated blast furnace gas and waste gas, the mending material is physically bonded with the wall surface, and the mending material contains more water, has larger shrinkage after water evaporation and is not firmly bonded with the wall surface, so the hanging time is shorter. About one week after repair, the blowby occurs and needs to be repaired again.
The first repairing material and the second repairing material both comprise powder, and the powder comprises 40-60 wt% of high-alumina fire clay, 15-25 wt% of clay fire clay, 5-15 wt% of aluminate cement and 15-25 wt% of clay brick slag aggregate.
Optionally, the powder material comprises 45-55 wt% of high-alumina fire clay, 17-23 wt% of clay fire clay, 7-13 wt% of aluminate cement and 17-23 wt% of clay brick slag aggregate.
Optionally, the powder material comprises 50 wt% of high-alumina fire clay, 20 wt% of clay fire clay, 10 wt% of aluminate cement and 20 wt% of clay brick slag aggregate.
The high-alumina fire clay is prepared by firing natural high-alumina bauxite raw materials at high temperature, wherein the weight of alumina is more than or equal to 48 percent.
Optionally, the firing temperature is 1300-1700 ℃.
Optionally, the refractoriness of the high-aluminum fire clay is 1750-1790 ℃.
Optionally, the refractoriness under load of the high-aluminum fire clay is 1420-1500 ℃.
Optionally, synthetic cordierite is included in the high alumina fireclay.
The high-aluminum fire clay is added into the patching material, so that the patching material has good construction, patching and smearing performances, and further the bonding force, the erosion resistance, the wear resistance and the high temperature resistance of the patching material are enhanced. Thereby easily obtaining the required thickness of the refractory brick seams and bonding the patching material into a compact whole.
The clay fire clay comprises 60-80 wt% of calcined clay clinker and 20-40 wt% of raw clay. The clinker in the clay fire clay is used as a main body, the raw clay is used as a bonding agent, and the raw clay and the clay clinker are mixed to increase the plasticity of the clay fire clay and reduce the air permeability and the water loss rate.
Optionally, the content of alumina in the clay fire clay is 30-46 wt%.
The clay fire clay is added into the patching material, so that the adhesion rate of the patching material can be improved, and the patching material can achieve good bonding performance.
It should be noted that the addition amount of the clay fire clay in the powder is not too large, and if the addition amount of the clay fire clay exceeds 25 wt%, the residual shrinkage of the repair material at low temperature is large, the strength is poor, cracks are easy to appear in brick seams, and therefore the repair material is separated from the refractory bricks before sintering.
The aluminate cement is a hydraulic cementing material which is mainly made of calcium aluminate and is ground, is a permanent binding agent, has better high-temperature resistance and can still keep higher strength at higher temperature. Because the monocalcium aluminate (CaO. Al2O3, abbreviated as CA) mineral in the high-alumina cement has the characteristics of high hydration speed, normal condensation, rapid hardening and early strength, the patching material has the hardening effect.
Optionally, the aluminate cement comprises 50 to 70 wt% monocalcium aluminate.
The particle size of the clay brick slag aggregate is less than or equal to 3mm, and the particle size of 75-85 wt% of particles in the clay brick slag aggregate is 2-3 mm.
The clay brick slag aggregate has great influence on the quality of the patching material product, and is equivalent to broken stone and sand of common building concrete. The clay brick slag aggregate is added into the patching material, so that moisture in the patching material can be quickly discharged when the patching material is dried and sintered, cracks generated after drying and sintering are reduced, the cohesiveness and the strength are improved, the hanging material is firm, the patching is smooth, and no cracks or bubbles exist.
Meanwhile, the fire clay is adopted for coke oven maintenance according to the material of the brick and the operating temperature during masonry production, and all the fire clay and the built refractory bricks are made of the same material in principle, namely the brick made of the material and the fire clay made of the material.
The powder of the present application does not contain phosphoric acid. Orthophosphoric acid is not inherently adhesive, but exhibits good adhesion when it comes into contact with refractory materials due to rapid reaction between the two to form phosphate. When phosphoric acid is used as a binder, the properties of the granular or powdery refractory material have an influence on the rate and strength of the bond formation. When the refractory repair material is used as a refractory repair material binding agent, very high temperature (about 700 ℃ or higher is used for achieving firm condensation, and the refractory repair material is not suitable for being used at low temperature). In addition, the high concentration of phosphoric acid can cause the reduction of high-temperature mechanical properties, and when the water amount is excessive, the furnace wall is cracked again due to the transitional cooling of the repaired wall surface.
The water content of the first repairing material is 25-30 wt%, and the water content of the second repairing material is 35-40 wt%.
The first repair material used for coating has higher consistency and viscosity, and can be dried in the coating time so as to achieve the required brick joint repairing and coating thickness and full mortar in the brick joint; the second repair material for perfusion has lower consistency and viscosity, can flow to brick joints at the bottom of each small flue 200 of the coke oven under the action of gravity and is filled fully.
Meanwhile, the water content of the first repairing material and the second repairing material not only needs to meet the operation time of repairing personnel, but also needs to prevent the condition that the water content in the repairing material is too much, so that the water content of the repairing material is greatly shrunk after evaporation, and cracks and the wall surface are not firmly bonded and fall off.
The repair method of the coke oven small flue comprises the following steps:
1. preamble work
Closing the exchange shutter, adding and subtracting the cock from blast furnace gas, detaching the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, cleaning mud and ash deposited at the bottom in the coke oven small flue 200 through the cleaning hole, purging the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the coke oven small flue 200 by compressed air, and cleaning the brick seam at the bottom.
2. Compounding repairing material
Uniformly mixing 40-60 wt% of high-alumina fire clay, 15-25 wt% of clay fire clay, 5-15 wt% of aluminate cement and 15-25 wt% of clay brick slag aggregate to prepare powder;
and mixing the powder material and water to respectively prepare a first paste-shaped mending material and a second paste-shaped mending material, wherein the water content of the first mending material is 25-30 wt%, and the water content of the second mending material is 35-40 wt%.
3. Repairing work
Coating a first repairing material on a gap 400 between a double-fork port of the exchange shutter connecting pipe 300 and a side lining of the coke oven small flue 200 from the inside through a cleaning hole, and troweling and compacting the repairing material by force to firmly bond the repairing material and the gap 400 between the double-fork port of the exchange shutter connecting pipe 300 and the side lining of the coke oven small flue 200; and filling the second repairing material into the small coke oven flue 200 through the cleaning holes, so that the second repairing material flows to the brick joints at the bottom of the small coke oven flue 200.
The sequence of smearing the first repairing material and perfusing the second repairing material can be exchanged, namely, the first repairing material can be smeared firstly, and then the second repairing material can be perfused, or the second repairing material can be perfused firstly and then the first repairing material can be smeared. As long as the water content of the repair material is kept when the repair material is reused.
When the gap 400 between the two-pronged socket of the exchange shutter connection pipe 300 and the lining of the coke oven small flue 200 is large, it is necessary to fill the gap 400 between the two-pronged socket of the exchange shutter connection pipe 300 and the lining of the coke oven small flue 200 with asbestos cord before applying the first repair material.
4. Follow-up work
Cleaning the repair materials falling from the bottom in the small flue 200 of the coke oven, installing and resetting the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, and finally resetting the blast furnace gas add-drop cock.
The method for repairing the small flue of the coke oven of the present application is further described in detail with reference to the following examples.
Example 1
The embodiment of the application provides a method for repairing a small flue of a coke oven, which comprises the following steps:
1. preamble work
Closing the exchange shutter, adding and subtracting the cock from blast furnace gas, detaching the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, cleaning mud and ash deposited at the bottom in the coke oven small flue 200 through the cleaning hole, purging the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the coke oven small flue 200 by compressed air, and cleaning the brick seam at the bottom.
2. Compounding repairing material
Uniformly mixing 50 wt% of high-alumina fire clay, 20 wt% of clay fire clay, 10 wt% of aluminate cement and 20 wt% of clay brick slag aggregate to prepare powder;
and mixing the powder material with water to respectively prepare a pasty first repairing material and a pasty second repairing material, wherein the water content of the first repairing material is 30 wt%, and the water content of the second repairing material is 40 wt%.
3. Repairing work
Coating a first repairing material on a gap 400 between a double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200 from the inside through a cleaning hole, and troweling and compacting the repairing material by force to firmly bond the repairing material and the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200; and filling the second repairing material into the small coke oven flue 200 through the cleaning holes, so that the second repairing material flows to the brick joints at the bottom of the small coke oven flue 200.
4. Follow-up work
Cleaning the repair materials falling from the bottom in the small flue 200 of the coke oven, installing and resetting the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, and finally resetting the blast furnace gas add-drop cock.
Example 2
The embodiment of the application provides a method for repairing a small flue of a coke oven, which comprises the following steps:
1. preamble work
Closing the exchange shutter, adding and subtracting the cock from blast furnace gas, detaching the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, cleaning mud and ash deposited at the bottom in the coke oven small flue 200 through the cleaning hole, purging the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the coke oven small flue 200 by compressed air, and cleaning the brick seam at the bottom.
2. Compounding repairing material
Uniformly mixing 30 wt% of high-alumina fire clay, 40 wt% of clay fire clay, 10 wt% of aluminate cement and 20 wt% of clay brick slag aggregate to prepare powder;
and mixing the powder material with water to respectively prepare a pasty first repairing material and a pasty second repairing material, wherein the water content of the first repairing material is 30 wt%, and the water content of the second repairing material is 40 wt%.
3. Repairing work
Coating a first repairing material on a gap 400 between a double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200 from the inside through a cleaning hole, and troweling and compacting the repairing material by force to firmly bond the repairing material and the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200; and filling the second repairing material into the small coke oven flue 200 through the cleaning holes, so that the second repairing material flows to the brick joints at the bottom of the small coke oven flue 200.
4. Follow-up work
Cleaning the repair materials falling from the bottom in the small flue 200 of the coke oven, installing and resetting the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, and finally resetting the blast furnace gas add-drop cock.
Example 3
The embodiment of the application provides a method for repairing a small flue of a coke oven, which comprises the following steps:
1. preamble work
Closing the exchange shutter, adding and subtracting the cock from blast furnace gas, detaching the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, cleaning mud and ash deposited at the bottom in the coke oven small flue 200 through the cleaning hole, purging the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the coke oven small flue 200 by compressed air, and cleaning the brick seam at the bottom.
2. Compounding repairing material
Uniformly mixing 30 wt% of high-alumina fire clay, 20 wt% of clay fire clay, 30 wt% of aluminate cement and 20 wt% of clay brick slag aggregate to prepare powder;
and mixing the powder material with water to respectively prepare a pasty first repairing material and a pasty second repairing material, wherein the water content of the first repairing material is 30 wt%, and the water content of the second repairing material is 40 wt%.
3. Repairing work
Coating a first repairing material on a gap 400 between a double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200 from the inside through a cleaning hole, and troweling and compacting the repairing material by force to firmly bond the repairing material and the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200; and filling the second repairing material into the small coke oven flue 200 through the cleaning holes, so that the second repairing material flows to the brick joints at the bottom of the small coke oven flue 200.
4. Follow-up work
Cleaning the repair materials falling from the bottom in the small flue 200 of the coke oven, installing and resetting the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, and finally resetting the blast furnace gas add-drop cock.
Example 4
The embodiment of the application provides a method for repairing a small flue of a coke oven, which comprises the following steps:
1. preamble work
Closing the exchange shutter, adding and subtracting the cock from blast furnace gas, detaching the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, cleaning mud and ash deposited at the bottom in the coke oven small flue 200 through the cleaning hole, purging the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the coke oven small flue 200 by compressed air, and cleaning the brick seam at the bottom.
2. Compounding repairing material
Uniformly mixing 50 wt% of high-alumina fire clay, 20 wt% of clay fire clay, 10 wt% of aluminate cement and 20 wt% of clay brick slag aggregate to prepare powder;
and mixing the powder material with water to respectively prepare a pasty first repairing material and a pasty second repairing material, wherein the water content of the first repairing material is 30 wt%, and the water content of the second repairing material is 50 wt%.
3. Repairing work
Coating a first repairing material on a gap 400 between a double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200 from the inside through a cleaning hole, and troweling and compacting the repairing material by force to firmly bond the repairing material and the gap 400 between the double-fork socket of the exchange shutter connecting pipe 300 and the inner lining of the small coke oven flue 200; and filling the second repairing material into the small coke oven flue 200 through the cleaning holes, so that the second repairing material flows to the brick joints at the bottom of the small coke oven flue 200.
4. Follow-up work
Cleaning the repair materials falling from the bottom in the small flue 200 of the coke oven, installing and resetting the upper cover plate 310 of the cleaning hole of the exchange shutter connecting pipe 300, and finally resetting the blast furnace gas add-drop cock.
Comparative example 1
The application provides a method for repairing a small flue of a coke oven, which comprises the following steps:
cleaning the old pug, wetting the small flue connector gap with water before plastering to ensure that the pug is firmly bonded, and consuming about 5-8 min;
filling asbestos ropes into the gaps 400 between the small flue connectors again, and tightly compacting by using steel drill rods, wherein the time is about 10 min;
tightly plastering the joint of the small flue by using clay fire pug, and finally plastering a heat-insulating material, wherein the time is about 10 min;
and (3) plastering and supplementing the bottom of the small flue connecting port of the compressed exhaust gas tray by using pug, and consuming about 10 min.
Test example 1
The time for the gap 400 between the two-pronged bell mouth of the exchange shutter connecting pipe 300 and the lining of the coke oven small flue 200 after the repair in examples 1 to 4 and comparative example 1 and the time for the brick gap at the bottom of the coke oven small flue 200 were measured, respectively.
However, as can be seen from comparison of examples 1 to 4 with comparative example 1, the cycle of the repair from the outside was only 3 months, while the cycle of the repair from the inside was 30 months or more. Meanwhile, high-alumina fire clay in the repairing material is reduced, and clay fire clay is added, so that the repairing period of the small flue 200 of the coke oven is shortened. High-alumina fire clay in the repairing material is reduced, and aluminate fire clay is added, so that the repairing period of the small flue 200 of the coke oven is shortened. When the water content of the second repair material is increased, the repair cycle of the brick joints at the bottom of the small flue 200 of the coke oven is shortened.
In summary, the method for repairing a coke oven small flue according to the embodiment of the present invention can repair the coke oven small flue 200 from the inside of the coke oven small flue 200 more stably by repairing the gap 400 between the coke oven small flue 200 and the two-way receiving opening of the exchange shutter connecting pipe 300, thereby blocking the occurrence of ignition and leakage of blast furnace gas in the coke oven small flue 200 filled with blast furnace gas by sucking air during updraft. And after the coke oven is normally produced and operated, the oven body expands, and air cannot enter the small flue 200 of the coke oven from the bellmouth of the small flue 200 of the coke oven and the expansion sliding gap 400 of the base top plate surface. Meanwhile, the gaps 400 at different positions are filled by two methods of smearing and pouring, so that the gaps 400 in the small coke oven flue 200 can be completely filled with the repairing material, and the small coke oven flue 200 is prevented from leaking and catching fire. And the first repairing material and the second repairing material have good contractibility, no crack, corrosion resistance and high temperature resistance, and can effectively prolong the repairing period of the small flue 200 of the coke oven.
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, as numerous modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for repairing a small flue of a coke oven, which is used for connecting a double-fork socket of a connecting pipe of an exchange shutter and a regenerator, is characterized by comprising the following steps:
and coating a first repairing material to a gap between the double-fork socket of the exchange shutter connecting pipe and the inner lining of the coke oven small flue from the inside of the coke oven small flue, and filling a second repairing material into the coke oven small flue so that the second repairing material flows to a brick seam at the bottom of the coke oven small flue.
2. The method for repairing the small flue of the coke oven as claimed in claim 1, wherein the first repairing material and the second repairing material both comprise powder materials, and the powder materials comprise 40-60 wt% of high alumina chamotte, 15-25 wt% of clay chamotte, 5-15 wt% of aluminate cement and 15-25 wt% of clay brick slag aggregate.
3. The method for repairing the small flue of the coke oven as claimed in claim 2, wherein the first repairing material has a water content of 25-30 wt%, and the second repairing material has a water content of 35-40 wt%.
4. The method for repairing the small flue of the coke oven as claimed in claim 3, wherein the alumina content in the high-alumina fire clay is more than or equal to 48 wt%;
optionally, the refractoriness of the high-aluminum fire clay is 1750-1790 ℃;
optionally, the refractoriness under load of the high-alumina fire clay is 1420-1500 ℃.
5. The method for repairing the small flue of the coke oven as claimed in claim 3, wherein the clay chamotte comprises 60-80 wt% of calcined clay clinker and 20-40 wt% of raw clay;
optionally, the content of alumina in the clay fire clay is 30-46 wt%.
6. The method for repairing the small flue of the coke oven as claimed in claim 3, wherein the aluminate cement comprises 50-70 wt% of monocalcium aluminate.
7. The method for repairing the small flue of the coke oven as claimed in claim 3, wherein the particle size of the clay brick slag aggregate is less than or equal to 3 mm;
optionally, the particle size of 75-85 wt% of the clay brick slag aggregate is 2-3 mm.
8. The method for repairing a coke oven small flue according to any one of claims 1 to 7, wherein before the first repair material is applied to a gap between the double-forked receiving port of the exchange shutter connecting pipe and the lining of the coke oven small flue from the inside, after the exchange shutter is closed, an upper cover plate of a cleaning hole of the exchange shutter connecting pipe is removed, and the repair is performed from the inside of the coke oven small flue through the cleaning hole.
9. The method for repairing a coke oven small flue according to claim 8, wherein after the upper cover plate of the cleaning hole of the exchange shutter connecting pipe is removed, the bottom of the coke oven small flue and a gap between the exchange shutter connecting pipe bifurcated socket and the lining of the coke oven small flue are cleaned through the cleaning hole.
10. The method for repairing a coke oven small flue according to any one of claims 1 to 7, wherein a gap between the exchange shutter connecting pipe bifurcated socket and the inner lining of the coke oven small flue is filled with asbestos cord before the first repair material is applied to the gap between the exchange shutter connecting pipe bifurcated socket and the inner lining of the coke oven small flue from inside.
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| CN202110060684.4A CN112898993A (en) | 2021-01-15 | 2021-01-15 | Method for repairing small flue of coke oven |
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| CN202110060684.4A CN112898993A (en) | 2021-01-15 | 2021-01-15 | Method for repairing small flue of coke oven |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114516760A (en) * | 2022-03-03 | 2022-05-20 | 广东韶钢松山股份有限公司 | Coke oven wall thermal state plastering and repairing refractory pug and preparation method and application thereof |
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| DE1471219B1 (en) * | 1962-09-18 | 1970-07-02 | Harbison Walker Refractories | Unfired refractory mass |
| CN109294601A (en) * | 2017-07-25 | 2019-02-01 | 广东韶钢松山股份有限公司 | A kind of carbonizing chamber of coke oven bottom fast repairing method |
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| CN114516760A (en) * | 2022-03-03 | 2022-05-20 | 广东韶钢松山股份有限公司 | Coke oven wall thermal state plastering and repairing refractory pug and preparation method and application thereof |
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