CN113528161B - Control method for coke oven top uncovering repair without blowby - Google Patents
Control method for coke oven top uncovering repair without blowby Download PDFInfo
- Publication number
- CN113528161B CN113528161B CN202110890984.5A CN202110890984A CN113528161B CN 113528161 B CN113528161 B CN 113528161B CN 202110890984 A CN202110890984 A CN 202110890984A CN 113528161 B CN113528161 B CN 113528161B
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- overhauling
- carbonization
- blowby
- furnace
- masonry
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- 239000000571 coke Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 230000002787 reinforcement Effects 0.000 claims abstract description 4
- 238000003763 carbonization Methods 0.000 claims description 76
- 238000002485 combustion reaction Methods 0.000 claims description 29
- 230000000903 blocking effect Effects 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 239000011449 brick Substances 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims description 9
- 238000004939 coking Methods 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention discloses a control method for repairing a coke oven uncovering top without blowby, which is improved by adopting the technologies of cooling control, oven wall heat preservation, steel column support reinforcement, masonry control, heating, thermal engineering, sealing with coke air pressure, nitrogen pressure maintaining, fire pressing inspection and ceramic repair welding, so as to improve the maintenance effect of the oven wall of the coke oven, ensure that blowby cannot occur after the production of the oven wall of the coke oven is repaired, effectively improve the maintenance quality and ensure the stable and smooth operation of the coke oven.
Description
Technical Field
The invention relates to the technical field of coking processes, in particular to a control method for repairing a top of a coke oven without blowby.
Background
In coking production, the vertical flame path of the coke oven wall is easily seriously damaged due to various reasons, the furnace wall cannot be repaired at the moment, and only the silica bricks from the bottom to the top of the carbonization chamber can be completely removed after cooling, and the furnace wall is rebuilt for uncovering and repairing. The temperature of the silica bricks is up to 1200-1300 ℃, and the temperature reduction can cause larger thermal stress to be generated in the adjacent non-overhauling combustion chamber, so that the furnace wall is cracked, cracked and blowby; the common maintenance period is as long as 10-15 days, the coking time of the adjacent non-maintenance carbonization chambers is long, the pressure in the carbonization chambers is negative, and the gas in the combustion chambers is leaked into the carbonization chambers to burn, so that the adjacent non-maintenance carbonization chambers are leaked. Therefore, when the furnace wall is lifted and repaired, blowby can occur at the joint parts of the overhauling combustion chamber and the adjacent non-overhauling combustion chamber, the maintenance effect is seriously affected, and the maintenance quality is not easy to meet the requirement
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the control method for coke oven top uncovering and repairing and no blowby is provided, which can improve the maintenance quality and ensure that blowby can not occur after the maintenance of the oven wall is put into operation.
The technical scheme adopted by the invention for solving the technical problems is as follows: the control method for coke oven top uncovering repair without blowby comprises the following steps:
step one, arranging a choke plug carbonization chamber and two buffer carbonization chambers on two sides of a carbonization chamber to be overhauled, wherein the choke plug carbonization chamber, the buffer carbonization chambers and adjacent non-overhauling combustion chambers are heated by coke oven gas;
step two, reinforcing a furnace column of the renovating carbonization chamber;
stopping heating the overhauling combustion chamber, reducing heating quantity of the non-overhauling combustion chamber, the choke plug carbonization chamber and the buffer carbonization chamber, keeping the temperature of the vertical flame path of the adjacent non-overhauling combustion chamber above 800 ℃, keeping the temperatures of the choke plug carbonization chamber and the vertical flame path of the combustion chamber at 900-1100 ℃ and 1200 ℃ and 1320 ℃ in sequence, and placing two fire blocking walls in the overhauling carbonization chamber when the temperature of the overhauling vertical flame path is lower than 800 ℃;
step four, dismantling old silica bricks in a step terrain from the furnace top downwards to the bottom of the carbonization chamber, arranging support protection while dismantling, and carrying out front heat preservation, sealing and support on the naked observation hole part of the buffer furnace number during dismantling;
step five, drawing control lines of each layer of masonry on the protection plate, drawing arrangement control lines at the bottom of the carbonization chamber, and performing masonry according to the drawn control lines;
step six, heating and baking the upper furnace door after the masonry is completed by utilizing the heat of the non-overhauling combustion chamber vertical flame path, conveying coke oven gas to the overhauling vertical flame path to ignite and continuously heating when the temperature is up to 650 ℃, and performing thermal-state work such as protective plate grouting, small furnace end masonry, furnace top grouting, cylinder brick masonry, bracing trench grouting heat preservation powder and the like when the masonry of the overhauling vertical flame path is heated to more than 750 ℃;
step seven, sealing the adjacent smoldering furnace carbonization chambers with coke in an air-pressure manner, and maintaining the pressure of nitrogen in the adjacent smoldering furnace carbonization chambers during overhauling;
step eight, when the temperature of the overhauling vertical flame path is raised to 1100 ℃, the furnace door is taken off, the fire blocking wall is removed, and the bottom of the carbonization chamber is cleaned;
step nine, after the fire blocking wall is removed, adjusting and overhauling the exhaust gas disc shutters on two sides of the combustion chamber, reducing fire suction pressure, visually observing whether blowby exists at a stubble connecting part, if the blowby is found, maintaining the blowby part, and then performing fire pressing inspection until no blowby exists;
and step ten, when the overhaul vertical flame path is continuously heated to 1200 ℃, coal is charged, and coking and production are carried out.
Further is: in the first step, coking time of the two buffer carbonization chambers is 48 hours and 24 hours respectively.
Further is: in the second step, the upper end of the machine coke side furnace column is fixed together by using the I-shaped steel during reinforcement, and meanwhile, cross braces on the machine coke side of the combustion chamber are welded and fixed on the corresponding furnace column, and the protection plate and the furnace column are spot-welded into a whole.
Further is: in the third step, the width of the first fire blocking wall is 20mm wider than that of the overhauling carbonization chamber, and the height is the same as the overhead height of the overhauling carbonization chamber; the second fire-blocking wall is placed when the adjacent wall is insulated, and ceramic fiber blankets are attached to the adjacent wall furnace wall to insulate the adjacent wall when the second fire-blocking wall is placed.
Further is: in the fifth step, zero expansion is adopted as a refractory material for masonry, and refractory clay is fed from a side furnace mouth during masonry; the masonry slurry is full, the verticality is connected with the protection plate and the stubble connecting wall in sequence, the stubble connecting wall is slightly recessed to a depth of 1-2 mm, and 15mm expansion joints are reserved in each 1-meter masonry.
Further is: in the seventh step, when the adjacent choke plug carbonization chambers are sealed with coke in an air-compressing manner, the air-compressing sealing material is blown in from the coal charging port of the choke plug carbonization chambers by using compressed air of 0.4MPa for 30 minutes each time, and then the process is continuously repeated for 1-2 times after stopping for 1.5 hours; when the nitrogen pressure is maintained for the adjacent choke plug carbonization chambers, a nitrogen pipe with the diameter of 30mm is paved from a furnace platform, the coal charging port of the choke plug carbonization chambers is connected, nitrogen is introduced into the choke plug carbonization chambers, and the nitrogen pressure is kept at 240Pa.
The beneficial effects of the invention are as follows: the invention improves the repairing process of uncovering and turning over the coke oven, adopts the technologies of cooling control, oven wall heat preservation, steel column support reinforcement, masonry control, temperature rise, thermal engineering, sealing with coke air pressure, nitrogen pressure maintaining, fire pressing inspection and ceramic repair welding to improve the repairing effect of the oven wall of the coke oven, can ensure that no blowby occurs after the oven wall of the coke oven is repaired and produced, effectively improves the repairing quality and ensures the stable and smooth operation of the coke oven.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be further described with reference to the drawings and examples.
Examples
As shown in fig. 1, the control method for coke oven top uncovering repair without blowby disclosed by the invention is implemented according to the following steps:
a choke plug carbonization chamber and two buffer carbonization chambers are respectively arranged at two sides of a carbonization chamber to be overhauled, combustion chambers are arranged among the choke plug carbonization chamber, the buffer carbonization chamber and the overhauling carbonization chamber, the choke plug carbonization chamber, the buffer carbonization chamber and the adjacent non-overhauling combustion chambers are heated by coke oven gas, and coking time of the two buffer carbonization chambers is respectively 48 hours and 24 hours;
step two, reinforcing furnace columns of the repairing carbonization chamber, fixing the upper ends of the furnace columns on the machine coke side together by using I-shaped steel during reinforcing, welding and fixing cross braces on the machine coke side of the combustion chamber on the corresponding furnace columns, and spot welding a protection plate and the furnace columns into a whole;
stopping heating the overhauling combustion chamber, reducing heating quantity of the non-overhauling combustion chamber, the choke plug carbonization chamber and the buffer carbonization chamber, keeping the temperature of the vertical flame path of the adjacent non-overhauling combustion chamber above 800 ℃, keeping the temperatures of the choke plug carbonization chamber and the vertical flame path of the combustion chamber at 900-1100 ℃ and 1200 ℃ and 1320 ℃ in sequence, and placing two fire blocking walls in the overhauling carbonization chamber when the temperature of the overhauling vertical flame path is lower than 800 ℃; the width of the first fire blocking wall is 20mm wider than that of the overhauling carbonization chamber, and the height is the same as the overhead height of the overhauling carbonization chamber; the second fire-blocking wall is placed when the adjacent wall is insulated, and ceramic fiber blankets are attached to the adjacent wall furnace wall to insulate the adjacent wall;
step four, dismantling old silica bricks in a step terrain from the furnace top downwards to the bottom of the carbonization chamber, arranging support protection while dismantling, and carrying out front heat preservation, sealing and support on the naked observation hole part of the buffer furnace number during dismantling;
step five, drawing control lines of each layer of masonry on the protection plate, drawing arrangement control lines at the bottom of the carbonization chamber, and performing masonry according to the drawn control lines; the zero expansion is adopted as a refractory material in the masonry, and refractory clay is fed from the side furnace mouth during the masonry; the masonry slurry is full, the verticality is connected with the protection plate and the stubble connecting wall in sequence, the stubble connecting wall is slightly recessed to a depth of 1-2 mm, and 15mm expansion joints are reserved in each 1-meter masonry;
step six, heating and baking the upper furnace door after the masonry is completed by utilizing the heat of the non-overhauling combustion chamber vertical flame path, conveying coke oven gas to the overhauling vertical flame path to ignite and continuously heating when the temperature is up to 650 ℃, and performing thermal-state work such as protective plate grouting, small furnace end masonry, furnace top grouting, cylinder brick masonry, bracing trench grouting heat preservation powder and the like when the masonry of the overhauling vertical flame path is heated to more than 750 ℃;
step seven, carrying out coke pneumatic sealing on the adjacent choke plug carbonization chambers, blowing the pneumatic sealing material into the choke plug carbonization chambers by using 0.4MPa compressed air from coal charging ports of the choke plug carbonization chambers for 30 minutes each time, and then stopping for 1.5 hours and continuing repeating for 1-2 times; during maintenance, nitrogen pressure maintaining is carried out on the adjacent choke plug carbonization chambers, nitrogen pipes with the diameters of 30mm are paved from a furnace platform, the coal charging ports of the choke plug carbonization chambers are connected, nitrogen is introduced into the choke plug carbonization chambers, and the nitrogen pressure is kept at 240Pa;
step eight, when the temperature of the overhauling vertical flame path is raised to 1100 ℃, the furnace door is taken off, the fire blocking wall is removed, and the bottom of the carbonization chamber is cleaned;
step nine, after the fire blocking wall is removed, adjusting and overhauling the exhaust gas disc shutters on two sides of the combustion chamber, reducing fire suction pressure, visually observing whether blowby exists at a stubble connecting part, if the blowby is found, maintaining the blowby part, and then performing fire pressing inspection until no blowby exists;
and step ten, when the overhaul vertical flame path is continuously heated to 1200 ℃, coal is charged, and coking and production are carried out.
Claims (5)
1. The control method for coke oven top uncovering and repairing without blowby is characterized by comprising the following steps: the method comprises the following steps:
step one, arranging a choke plug carbonization chamber and two buffer carbonization chambers on two sides of a carbonization chamber to be overhauled, wherein the choke plug carbonization chamber, the buffer carbonization chambers and adjacent non-overhauling combustion chambers are heated by coke oven gas;
step two, reinforcing a furnace column of the renovating carbonization chamber;
stopping heating the overhauling combustion chamber, reducing heating quantity of the non-overhauling combustion chamber, the choke plug carbonization chamber and the buffer carbonization chamber, keeping the temperature of the vertical flame path of the adjacent non-overhauling combustion chamber above 800 ℃, keeping the temperatures of the choke plug carbonization chamber and the vertical flame path of the combustion chamber at 900-1100 ℃ and 1200 ℃ and 1320 ℃ in sequence, and placing two fire blocking walls in the overhauling carbonization chamber when the temperature of the overhauling vertical flame path is lower than 800 ℃;
step four, dismantling old silica bricks in a step terrain from the furnace top downwards to the bottom of the carbonization chamber, arranging support protection while dismantling, and carrying out front heat preservation, sealing and support on the naked observation hole part of the buffer furnace number during dismantling;
step five, drawing control lines of each layer of masonry on the protection plate, drawing arrangement control lines at the bottom of the carbonization chamber, and performing masonry according to the drawn control lines;
step six, heating and baking the upper furnace door after the masonry is completed by utilizing the heat of the non-overhauling combustion chamber vertical flame path, conveying coke oven gas to the overhauling vertical flame path to ignite and continuously heating when the temperature is up to 650 ℃, and grouting a protection plate, masonry of a small furnace end, grouting the furnace top, masonry of a cylinder brick and bracing trench grouting heat preservation powder when the masonry of the overhauling vertical flame path is heated to more than 750 ℃;
step seven, carrying out coke pneumatic sealing on the adjacent choke plug carbonization chambers, carrying out nitrogen pressure maintaining on the adjacent choke plug carbonization chambers during maintenance, blowing the pneumatic sealing material into the choke plug carbonization chambers from coal charging ports of the choke plug carbonization chambers by using 0.4MPa compressed air for 30 minutes each time, and then stopping for 1.5 hours and continuing repeating for 1-2 times; when the adjacent choke plug carbonization chambers are subjected to nitrogen pressure maintaining, nitrogen pipes with the diameter of 30mm are paved from a furnace platform, the coal charging ports of the choke plug carbonization chambers are connected, nitrogen is introduced into the choke plug carbonization chambers, and the nitrogen pressure is kept at 240Pa;
step eight, when the temperature of the overhauling vertical flame path is raised to 1100 ℃, the furnace door is taken off, the fire blocking wall is removed, and the bottom of the carbonization chamber is cleaned;
step nine, after the fire blocking wall is removed, adjusting and overhauling the exhaust gas disc shutters on two sides of the combustion chamber, reducing fire suction pressure, visually observing whether blowby exists at a stubble connecting part, if the blowby is found, maintaining the blowby part, and then performing fire pressing inspection until no blowby exists;
and step ten, when the overhaul vertical flame path is continuously heated to 1200 ℃, coal is charged, and coking and production are carried out.
2. The control method for coke oven roof uncovering repair without blowby as claimed in claim 1, wherein: in the first step, coking time of the two buffer carbonization chambers is 48 hours and 24 hours respectively.
3. The control method for coke oven roof uncovering repair without blowby as claimed in claim 1, wherein: in the second step, the upper end of the machine coke side furnace column is fixed together by using the I-shaped steel during reinforcement, and meanwhile, cross braces on the machine coke side of the combustion chamber are welded and fixed on the corresponding furnace column, and the protection plate and the furnace column are spot-welded into a whole.
4. The control method for coke oven roof uncovering repair without blowby as claimed in claim 1, wherein: in the third step, the width of the first fire blocking wall is 20mm wider than that of the overhauling carbonization chamber, and the height is the same as the overhead height of the overhauling carbonization chamber; the second fire-blocking wall is placed when the adjacent wall is insulated, and ceramic fiber blankets are attached to the adjacent wall furnace wall to insulate the adjacent wall when the second fire-blocking wall is placed.
5. The control method for coke oven roof uncovering repair without blowby as claimed in claim 1, wherein: in the fifth step, zero expansion bricks are adopted as refractory materials for masonry, and refractory clay is fed from a side furnace mouth during masonry; the masonry slurry is full, the verticality is connected with the protection plate and the stubble connecting wall in sequence, the stubble connecting wall is slightly recessed to a depth of 1-2 mm, and 15mm expansion joints are reserved in each 1-meter masonry.
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| CN202110890984.5A CN113528161B (en) | 2021-08-04 | 2021-08-04 | Control method for coke oven top uncovering repair without blowby |
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| CN202110890984.5A CN113528161B (en) | 2021-08-04 | 2021-08-04 | Control method for coke oven top uncovering repair without blowby |
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