CN110540842B - Furnace body repairing method for recycling coke oven after overall shutdown - Google Patents
Furnace body repairing method for recycling coke oven after overall shutdown Download PDFInfo
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- CN110540842B CN110540842B CN201910778585.2A CN201910778585A CN110540842B CN 110540842 B CN110540842 B CN 110540842B CN 201910778585 A CN201910778585 A CN 201910778585A CN 110540842 B CN110540842 B CN 110540842B
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- brick
- fire clay
- coke oven
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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
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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
- C10B29/02—Brickwork, e.g. casings, linings, walls
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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
Abstract
A furnace body repairing method for the recovery of coke oven after the integral shutdown is characterized by comprising the following steps: a. repairing a coke oven regenerator, b, repairing a coke oven chute area, c, repairing a carbonization chamber, and d, repairing the oven top. The furnace body repairing method for the overall shutdown and re-production of the coke oven has the advantages that the time for repairing the furnace body is short compared with the time for repairing the furnace body after the furnace body is completely removed, the cost for repairing the furnace body is low compared with the cost for repairing the furnace body after the furnace body is completely removed, the production time of the coke oven is greatly increased, the social refractory material resources are saved, and the furnace body repairing method meets the technical requirements of the normal production of the coke oven through the effect inspection of commissioning.
Description
Technical Field
The invention relates to a coke oven maintenance method, in particular to a furnace body repair method for the recovery of a coke oven after the integral shutdown.
Background
Coke is a necessary raw material for smelting steel. China has become the first producing, consuming and exporting countries of coke in the world. As a core device for producing coke, after a coke oven is built and put into operation, the coke oven is not stopped generally, and the coke oven is not stopped and scrapped until the coke oven can not be normally produced, which is mainly caused by the characteristics of a refractory material of the coke oven. The coke oven mainly comprises silica bricks, the temperature of the silica bricks is lower than 573 ℃, the crystal shape in the silica bricks is changed rapidly, cracks are generated, and the sealing performance of the coke oven is damaged seriously. The method of shutting down the coke oven after the whole production process of the coke oven is in a cold state, repairing the oven body again, then baking the oven and putting into production faces a series of technical and economic problems, and represents a technical bottleneck which is difficult to break through.
Therefore, the known method for repairing the furnace body of the coke oven by stopping the furnace and producing the coke oven again has various inconveniences and problems.
Disclosure of Invention
The invention aims to provide a furnace body repairing method for the overall shutdown and the subsequent production of a coke furnace, which has the advantages of short time, low cost and good effect.
In order to achieve the purpose, the technical solution of the invention is as follows:
a furnace body repairing method for the recovery of coke oven after the integral shutdown is characterized by comprising the following steps:
a. coke oven regenerator repair
Jointing the wall of the heat storage chamber, cleaning cracks of the wall of the heat storage chamber, removing attached fire mud and brick scraps, jointing the cracks of the wall by using a jointing knife, wherein the jointing is full and compact, and the jointing of each gap is in place;
b. coke oven chute section repair
Sealing the front surface of a coke oven chute, removing a coke baffle plate and a coke sliding plate, cleaning an original sealing heat-insulating layer to the surface of a brick, plugging a scattered asbestos rope, and pointing and sealing; plugging and cleaning a chute port;
c. repair of carbonization chamber
Jointing all brick seams of the carbonization chamber, taking out the plug bricks, sealing the furnace shoulder seams, replacing bottom bricks of the carbonization chamber and patching the furnace wall;
d. furnace roof repair
The demolition of the furnace top large pit brick comprises a pot brick, a clay brick and a heat preservation brick, the elevation masonry of the furnace top layer is measured before demolition, the masonry is controlled according to the elevation masonry, and a stay wire is used for masonry during masonry, so that a certain gradient is ensured from the furnace to two sides of the furnace top of the coke furnace.
The furnace body repairing method for the overall shutdown and the re-production of the coke oven can be further realized by adopting the following technical measures.
According to the method, cracks with the gaps larger than or equal to 3mm of the wall body of the regenerator are subjected to jointing treatment by using the silicon phosphate fire clay, the ratio of phosphoric acid to water in the silicon phosphate fire clay is 15% -20%, and the stirred silicon phosphate fire clay is used on the same day.
The method wherein all the brick joints of the carbonization chamber comprise through cracks and non-through cracks.
In the method, the seam of the brick of the plug brick seat is hooked.
The method wherein the furnace shoulder seam depth is greater than twice the ceramic fiber rope diameter, and silica fire clay is used to pack between two fiber ropes.
In the method, before the bricks at the bottom of the carbonization chamber are replaced after being detached, the bottom is cleaned, then silicon fire clay is used for grouting the bottom of the carbonization chamber in batches, one liter of silicon fire clay is grouted at most each time, and the specific gravity of the silicon fire clay is about 1.5kg/cm3。
In the method, the brickwork damaged by the furnace wall is removed, the bottom of the vertical flue is cleaned, and old fire clay on the brickwork which is not removed is removed; rebuilding the demolished furnace wall cave, and building by using medium-temperature silicon fire clay; the masonry process requires full mortar and uniform mortar joints, and reverse staggering is forbidden.
By adopting the technical scheme, the furnace body repairing method for the overall shutdown and the re-production of the coke oven has the following advantages:
1. the time for repairing the furnace body is short compared with the time for repairing the furnace body after the furnace body is completely removed;
2. the cost of furnace body repair is low compared with the method of repairing the furnace body after the furnace body is completely removed, the production time of the coke oven is greatly increased, and the social refractory material resources are saved;
3. the furnace body repairing method meets the technical requirements of normal production of the coke oven through the inspection of the production effect.
Drawings
FIG. 1 is a schematic view of a furnace body repair part produced again after the overall shutdown of a coke oven according to an embodiment of the invention.
In the figure: 1 basic platform, 2 regenerative chambers, 3 inclined ways, 4 carbonization chambers and 5 furnace tops.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
Referring to fig. 1, fig. 1 is a schematic view of a furnace body repair part produced again after the overall shutdown of a coke oven according to an embodiment of the invention.
The invention relates to a furnace body repairing method for the overall shutdown and the re-production of a coke oven, which comprises the following steps:
a. coke oven regenerator repair
The wall jointing of the regenerator 2 is a working core, and cracks are cleaned firstly to remove attached fire clay and brick scraps. Crack larger than or equal to 3mm is treated by pointing with silicon phosphate fire clay, the ratio of phosphoric acid and water is 15-20%, and the stirred fire clay is used on the same day. And (4) pointing by using a pointing knife, wherein the pointing is full and compact. Each seam is pointing in place. And treating cracks smaller than 3mm by using silicon fire clay brushing slurry, wherein the specific gravity of the silicon fire clay is 1.5-1.8kg/cm3, and each crack is brushed in place.
b. Coke oven chute section repair
And (3) sealing the front surface of the chute 3, removing the coke baffle plate and the coke sliding plate, cleaning the original sealed heat insulation layer to the surface of the brick, plugging scattered asbestos ropes, and pointing and sealing. And (4) plugging and cleaning the chute port.
c. Repair of carbonization chamber
1. Pointing treatment of all brick joints in carbonization chamber
And (3) pointing all cracks (including the overhead bricks, the coal feeding port and the vicinity of the ascending pipe orifice) on the wall surface of the carbonization chamber, and cleaning loose fire clay before pointing.
1) And (3) plugging the crack with the depth of more than 10mm to the position with the depth of 7-8cm of pointing by using a ceramic fiber cotton rope, pointing by using silicon phosphate fire clay added with siliceous aggregate with the particle size of 3-6mm, wherein the proportion of the aggregate to the fire clay is 20-30%, the proportion of the phosphoric acid to the water is 30%, the pointing depth is 7-8cm, and the stirred fire clay is used on the same day.
2) And (3) pointing the non-through crack larger than 10mm by using silicon phosphate fire clay added with siliceous aggregate, wherein the particle size of the aggregate is 3-6mm, the ratio of the aggregate to the fire clay is 20-30%, the ratio of phosphoric acid to water is 30%, the entire crack is filled with pointing, and the stirred fire clay is used on the same day.
3) The silicon phosphate fire clay with the aggregate for pointing needs to be stirred by a forced stirrer.
4) 3-10mm crack through seam, firstly using ceramic fiber cotton rope to plug the crack to the position with the depth of 7-8cm of pointing depth, then using phosphoric acid silicon fire clay to carry out pointing treatment, wherein the ratio of phosphoric acid and water is 15% -20%, and the stirred fire clay is used on the same day.
5) 3-10mm cracks are not communicated, silicon phosphate fire clay is used for jointing treatment, the ratio of phosphoric acid to water is 15% -20%, and the stirred fire clay is used on the same day.
6) Cracks of less than 3mm, as far as possible packed with 1mm of ceramic fiber paper.
2. Stopper brick removal
And after the plug brick is taken out, cleaning the surrounding old fire clay, and ensuring the aperture size to build the plug brick again. The brick of the plug brick seat is provided with a gap for jointing.
3. Furnace shoulder seam sealing
Cleaning and purging tar blocks between the protective plate and the furnace shoulder; and according to the actual size of the gap on site, the periphery of the protective plate is plugged with new ceramic asbestos ropes until the surface is smooth. If the depth of the furnace shoulder seam is more than twice the diameter of the ceramic fiber rope, silicon fire clay is used for filling between the two fiber ropes.
4. Bottom brick replacement of carbonization chamber
Two bricks in the middle of the carbon bottom brick of the carbonization chamber are completely replaced and need to be removed in a protective way, so that the 8 th layer brick of the inclined channel is prevented from being damaged. Cleaning the bottom of the carbonization chamber after detaching the brick and before replacing the brick, then using silicon fire clay to perform batch grouting on the bottom of the carbonization chamber, wherein one liter of grouting is performed at most each time, and the specific gravity of the silicon fire clay is about 1.5kg/cm3。
Before building, sundries such as floating ash need to be cleaned. During masonry, the top surface elevation is consistent with the bottom bricks (layer 9) of the carbonization chambers which are not removed from the two sides, and the fire mud is uniformly and fully coated. The method comprises the steps of firstly, dry-swinging a carbon bottom brick, and then determining the size of an ash joint. The bottom building direction of the carbonization chamber is from the coke side to the machine side. And 3, reserving expansion gaps for every three bricks at the bottom of the carbonization chamber, wherein the size of the expansion gaps is 7mm, and the expansion gaps are filled by adopting ceramic fiber blankets. The bottom of the carbonization chamber is from the machine side to the coke side, and reverse dislocation is prohibited.
5. Repairing method for furnace wall
Demolishing the brickwork damaged by the furnace wall, cleaning the bottom of the vertical flue, and removing the old fire clay on the brickwork which is not demolished. And (5) rebuilding the demolished furnace wall cave, and using medium-temperature silicon fire clay for building. The masonry process requires full mortar and uniform mortar joints, and reverse staggering is forbidden. The processed surface of the brick is placed on the surface of the brick, and the coke surface is not processed strictly. When the furnace is built, the fire clay is strictly prevented from falling into the bottoms of the vertical flame path and the inclined path, and the interiors of the vertical flame path and the inclined path of the repaired combustion chamber are kept clean and smooth and have no impurities.
d. Furnace roof repair
And (3) removing the 5-layer big pit brick from the furnace roof to the 72 th layer, wherein 9 layers of bricks, 1 layer of brick, 1 layer of clay brick and 7 layers of insulating bricks are counted. And measuring the elevation masonry of the top layer of the coke oven before dismantling, and using the elevation masonry as a control basis for masonry, wherein stay wires are used for masonry during masonry, so that a certain gradient is ensured from the top of the coke oven to the two sides of the coke oven.
The method for repairing the furnace body of the coke oven which is produced repeatedly after the coke oven is integrally stopped is a technical progress which breaks through the technical bottleneck, and is a novel coke oven maintenance method which has short repair time, low cost and good effect and can meet the requirement of normal production of the coke oven again after the coke oven is stopped.
The furnace body repairing method for the overall shutdown and re-production of the coke oven is applied to the maintenance of a 60-hole JNX3-70-1 type re-heating top-mounted coke oven which is put into production in 3 months in 2010 of a coke plant in a certain steel mill and is designed by medium smelting coke resistance, the coke oven is shut down and cooled in 9 months in 2018, and the cooling time is about 2 months. And stopping production and cooling to a cold state in 2018 and 9 months. And the rehabilitation furnace body is repaired in 2019 and 4 months. The oven starts to be baked in 6 months in 2019, and the coal charging and production are started in 25 months in 7 months in 2019. All technical indexes of the coke oven reach the normal production requirements. The maintenance of the coke oven is the first cold-state re-production project of the large coke oven in China.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Claims (2)
1. A furnace body repairing method for the recovery of coke oven after the integral shutdown is characterized by comprising the following steps:
a. coke oven regenerator repair
Jointing the wall of the heat storage chamber, cleaning cracks of the wall of the heat storage chamber, removing attached fire mud and brick scraps, jointing the cracks of the wall by using a jointing knife, wherein the jointing is full and compact, and the jointing of each gap is in place;
b. coke oven chute section repair
Sealing the front surface of a coke oven chute, removing a coke baffle plate and a coke sliding plate, cleaning an original sealing heat-insulating layer to the surface of a brick, plugging a scattered asbestos rope, and pointing and sealing; plugging and cleaning a chute port;
c. repairing the carbonization chamber, comprising the following steps:
pointing all brick joints in the carbonization chamber:
1) the crack is larger than 10mm, a ceramic fiber cotton rope is firstly used for plugging to the crack depth of 7-8cm, then the silicon phosphate fire clay added with siliceous aggregate is used for crack pointing, the particle size of the aggregate is 3-6mm, the ratio of the aggregate to the fire clay is 20-30%, the ratio of phosphoric acid to water is 30%, the crack depth is 7-8cm, and the stirred fire clay is used on the same day;
2) the non-through cracks larger than 10mm are subjected to pointing by using silicon phosphate fire clay added with siliceous aggregate, the particle size of the aggregate is 3-6mm, the ratio of the aggregate to the fire clay is 20-30%, the ratio of phosphoric acid to water is 30%, the whole crack is filled with pointing, and the stirred fire clay is used on the same day;
3) the silicon phosphate fire clay with aggregate for pointing needs to be stirred by a forced stirrer;
4) 3-10mm through cracks are firstly plugged to the positions with the depth of 7-8cm of pointing by using ceramic fiber cotton ropes, then pointing is carried out by using silicon phosphate fire clay, the ratio of phosphoric acid to water is 15-20%, and the stirred fire clay is used on the same day;
5) 3-10mm of non-through cracks are subjected to jointing treatment by using silicon phosphate fire clay, the ratio of phosphoric acid to water is 15% -20%, and the stirred fire clay is used on the same day;
6) cracks smaller than 3mm are filled by using ceramic fiber paper with the thickness of 1mm as much as possible;
taking out the plug brick: after the plug brick is taken out, cleaning the surrounding old fire clay, ensuring that the plug brick can be built again in the aperture size, and pointing the gap of the plug brick seat brick;
sealing a furnace shoulder seam: cleaning and purging tar blocks between the protective plate and the furnace shoulder; according to the actual gap size on site, new ceramic asbestos ropes are plugged around the protective plate until the surface is flat, and if the depth of the furnace shoulder gap is more than twice the diameter of the ceramic fiber ropes, silicon fire clay is used for plugging between the two fiber ropes;
replacing bottom bricks of the carbonization chamber: two bricks in the middle of the brick at the bottom of the carbonization chamber are completely replaced and need to be protectively removed, the 8 th layer of brick on the inclined way is prevented from being damaged, the bottom is cleaned up before the brick is replaced after the brick is detached, then silicon cement mortar is used for grouting the bottom of the carbonization chamber in batches, one liter of silicon cement mortar is grouted at most each time, and the specific gravity of the silicon cement mortar is 1.5kg/cm3；
Repairing the furnace wall: demolishing a brickwork damaged by a furnace wall, cleaning the bottom of a vertical flue, removing old fire clay on the brickwork which is not demolished, rebuilding the demolished furnace wall hole, and building by using medium-temperature silicon fire clay, wherein the building process requires full mortar and uniform mortar joints, and reverse slab staggering is forbidden;
d. furnace roof repair
The demolition of the furnace top large pit brick comprises a pot brick, a clay brick and a heat preservation brick, the elevation masonry of the furnace top layer is measured before demolition, the masonry is controlled according to the elevation masonry, and a stay wire is used for masonry during masonry, so that a certain gradient is ensured from the furnace to two sides of the furnace top of the coke furnace.
2. The method for repairing the furnace body of the coke oven which is produced again after the coke oven is stopped integrally as claimed in claim 1, wherein cracks with a gap of more than or equal to 3mm in the wall body of the heat storage chamber are subjected to jointing treatment by using silicon phosphate fire clay, the ratio of phosphoric acid to water in the silicon phosphate fire clay is 15% -20%, and the stirred silicon phosphate fire clay is used on the same day.
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| CN111440619A (en) * | 2020-03-25 | 2020-07-24 | 五冶集团上海有限公司 | Method for repairing cracks of coke oven carbonization chamber |
| CN111440620A (en) * | 2020-03-25 | 2020-07-24 | 五冶集团上海有限公司 | Method for repairing carbonization chamber of coke oven after overall shutdown |
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