CN110760316A - Method for repairing blowby guniting of coke oven brick gas duct - Google Patents
Method for repairing blowby guniting of coke oven brick gas duct Download PDFInfo
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- CN110760316A CN110760316A CN201911035334.1A CN201911035334A CN110760316A CN 110760316 A CN110760316 A CN 110760316A CN 201911035334 A CN201911035334 A CN 201911035334A CN 110760316 A CN110760316 A CN 110760316A
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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 method for repairing blowby guniting of a coke oven brick gas duct belongs to the technical field of coking. The method comprises the following steps: closing the gas of the blowby coke oven brick gas channel to be treated; uniformly mixing clay fire clay, silicon fire clay phosphoric acid and industrial water to obtain a guniting material; the full-flow device is sequentially connected with a pulp shooting machine and a coal gas lower spray pipe, and comprises a full-flow pipe, an embedded connection pipe, a feeding hose, a backflow hose, a pressure release valve and a pulp storage barrel; the guniting material is pressed into the brick gas channel through the coke oven gas lower nozzle by a guniting machine, and the pressure is released when the slurry flows out from the backflow hose; after the pressure of the pulp sprayer is relieved, the full-flow device is dismounted, and the bamboo chips are rotated to clean the inner wall of the brick gas channel; and finishing the repairing process after detecting that the fire on the brick gas channel is normal. The method has the advantages of rapidness, high efficiency, capability of strictly repairing the leakage points of the brick gas channels, full and uniform leakage brick joint slurry, good long-term sealing effect, consistent spray repair effect of each brick gas channel and the like.
Description
Technical Field
The invention belongs to the technical field of coking, and particularly relates to a method for repairing blowby guniting of a coke oven brick gas duct.
Background
The coke oven with downward-spraying gas supply is heated by coke oven gas, and the coke oven gas enters the combustion chamber through the brick gas channel to be combusted, so that heat is provided for coke oven production. The brick gas channel is a channel for coke oven gas to enter a coke oven from a gas pipeline for combustion, is built by refractory bricks of specific models and clay ash, and is formed by expanding a furnace body along with the increase of the age of the coke oven, refractory materials between the bricks are easy to loosen and fall off, and gaps are formed. Coke oven gas leaks to the heat accumulation chamber from the gap, burns in the heat accumulation chamber, and detonates in the exchange process to damage the heat accumulation chamber and a sealing wall, a coke oven chimney emits black smoke, the gas quantity in the combustion chamber is insufficient, the heat provided for coking production is insufficient, the coke quality is influenced, and the shutdown maintenance can be caused in serious cases.
The traditional guniting repair method for the brick gas duct comprises a pipe inserting method and a guniting method. The pipe inserting method is characterized in that a steel pipe with the length of about 2 meters is inserted into a brick gas channel, and the gap between the lower steel pipe and the brick gas channel is sealed. The traditional guniting method is to utilize a guniting machine and a guniting pipe to spray slurry in a brick gas channel, so that the slurry is sprayed into a brick seam to achieve a sealing effect, the guniting material flows down in the brick gas channel under the action of gravity and naturally flows into the brick seam in the brick gas channel, the slurry flowing in the brick seam in the method is very little, only a short-term surface sealing effect can be achieved on the sealing of the brick gas channel, the effect is not good when a coke oven is heated for a long time, the operation time is long, the slurry cannot be fully utilized, a lower spray pipe is easy to block, the gunning effect of each brick gas channel is different, the number of brick gas channels with high and low temperatures in horizontal arrangement is large, difficulty and frequency are brought to the temperature regulation of a firer, the long-term temperature is unstable, the coke quality is influenced, graphite is easy to form on the wall of the coke, the coke pushing current.
Disclosure of Invention
The technical problem to be solved is as follows: the method for repairing the blowby guniting of the coke oven brick gas duct has the advantages of being rapid and efficient, capable of deeply and tightly repairing blowby brick gas duct leakage points, full and uniform in blowby brick seam mud, good in long-term sealing effect, consistent in guniting effect of each brick gas duct and the like.
The technical scheme is as follows: the blowby guniting repairing method for the coke oven is characterized in that the coke oven is a coke oven with downward-spraying gas supply, the gas flow of the coke oven is controlled by adding or subtracting a cock in a brick gas channel of the coke oven, the coke oven sends coke oven gas into the bottom of a vertical flue of a combustion chamber of the coke oven through a lower nozzle of the coke oven gas to be converged with air and then combusted, the lower nozzle of the coke oven gas comprises a four-way plug and a small adjusting hole plate, the four-way plug is arranged at the tail end of the lower nozzle of the coke oven gas and guides the coke oven gas into the gas channel of the coke oven, and the small adjusting hole plate is arranged at the joint of the lower nozzle of the coke oven gas and a:
closing blowby coke oven gas to be treated to add or subtract cock, unscrewing a four-way large and small plug of a lower spray pipe of the coke oven gas, and tightly plugging an adjusting small pore plate by using gauze;
step two, uniformly mixing 27-33 parts of clay fire clay, 27-33 parts of silicon fire clay, 8-12 parts of phosphoric acid and 17-23 parts of industrial water by mass to obtain a guniting material;
connecting a full-flow device with a pulp sprayer and the coke oven gas lower spray pipe treated in the first step in sequence, wherein the full-flow device comprises a full-flow pipe, an embedded pipe, a feeding hose, a backflow hose, a pressure release valve and a pulp storage barrel, the full-flow pipe is adjustable in length, the top of the full-flow pipe extends into the coke oven gas lower spray pipe, the embedded pipe is a cylindrical pipe which is sealed at the bottom, hollow in the inner part and open at the top end, the pipe diameter of the embedded pipe is larger than that of the full-flow pipe, the bottom of the full-flow pipe penetrates through the center of the bottom of the embedded pipe, the opening end of the embedded pipe is in threaded connection with the tail end of the coke oven gas lower spray pipe, the discharging port of the feeding pipe is connected with the wall of the embedded pipe, the feeding port of the feeding pipe is connected with the discharging port of;
feeding the guniting material prepared in the step two into a guniting machine, wherein the guniting machine is provided with a compressed air valve and a pressure relief valve, opening the compressed air valve of the guniting machine to enable the pressure of the guniting machine to be suppressed to 0.4MPa, then opening the pressure relief valve between the guniting machine and a feeding hose, pressing the guniting material into a brick gas pipeline through a coke oven gas lower nozzle, closing the pressure relief valve between the guniting machine and the feeding hose and the compressed air valve on the guniting machine when the slurry flows out from a backflow hose, and opening the pressure relief valve of the guniting machine to relieve the pressure;
step five, after the pressure of the pulp shooting machine is relieved, the full-flow device is dismounted, and the bamboo chips are used for rotating and cleaning the inner wall of the brick gas channel;
and step six, closing the four-way plug of the lower spray pipe of the coke oven gas, opening the treated blowby coke oven gas to add or subtract cock, and finishing the repairing process after detecting that the firing condition of the brick gas channel is normal.
Preferably, in the second step, 30 parts of clay fire clay, 30 parts of silicon fire clay, 10 parts of phosphoric acid and 20 parts of industrial water are uniformly mixed by mass to obtain the guniting material.
Preferably, the shotcrete machine in the third step is a shotcrete machine which is purchased from a 0.8MPa ZSPB-5 type explosion-proof shotcrete machine.
Preferably, the feeding hose and the return hose in the third step are rubber pipes.
Preferably, the full flow pipe in the third step comprises at least two full flow short pipes with the same size, the bottom of each full flow short pipe is movably connected with the top of the other full flow short pipe, the top of the first full flow short pipe extends into the lower spray pipe of the coke oven gas, and the bottom of the last full flow short pipe penetrates through the center of the bottom of the connecting pipe and is connected with the slurry storage barrel through a return hose.
Preferably, the pressure relief valve is DN15, 304 stainless steel ball valve.
Has the advantages that: 1. the method adopts the full-flow grouting technology, can deeply repair and tightly seal the leakage points of the brick gas duct, achieves full and uniform brick seam slurry of the brick gas duct, has good long-term sealing effect, reasonably arranges small pore plates, has high and stable transverse arrangement coefficient, improves the temperature of the coke oven, reduces the gas consumption, has obvious effect on improving the coke quality, improves the crushing strength M40 of the coke from 85 percent to 85.7 percent and improves various performances;
2. the method can lead the redundant mud material to flow back into the mud storage barrel from the full flow pipe, can be recycled, and can prevent mud from blocking the brick gas channel;
3. the length of the full flow pipe in the method is adjustable, the height of slurry entering the brick gas channel can be controlled by controlling the length of the full flow pipe, and the slurry is prevented from entering the vicinity of a lamp cap brick due to overhigh pressure and cracking the brick gas channel brick to cause more serious leakage and blockage;
4. according to the method, the pressure release valve is arranged at the feeding end of the feeding pipe of the full flow device, and through the action of the pressure release valve, redundant slurry feeding pipes in the brick gas channel can be discharged into the slurry storage barrel after the slurry spraying machine finishes spraying slurry, so that the utilization rate of the slurry preparation is improved;
5. the method can effectively remove the blowby of the brick gas channel for a long time, the temperature of the vertical flue rises by about 60-80 ℃ before and after the blowby, and the single coke oven can save 500-800 m coke oven gas3And h, the uniformity of the transverse arrangement temperature is improved, and on the premise that the distribution of the small orifice plates is adjusted by the lower spray pipes, the K is more than 90%, for example, as shown in a transverse arrangement curve diagram of a transverse wall temperature of a coke oven 20# of a coke oven 2# of Jiangsu sand Steel group Limited company, the full-flow grouting method is adopted, the transverse arrangement coefficient is improved to 96% (the number of qualified fire channels is 27) from 82% before the full-flow grouting method, and the furnace temperature is greatly optimized and the coke quality is improved by the full-flow grouting method. The temperature of the furnace end can be increased, the maturity of furnace end coke is improved, the quality of furnace end coke is improved, the phenomenon of blasting of a brick gas channel during exchange is reduced by reducing the smoke generated during coke discharging, the normal operation of heating equipment is ensured, and the gas leakage and the occurrence of fire accidents are prevented. The condition of small flue fire is reduced, the flue temperature is not easy to be overhigh, the condition that the temperature of a regenerator and the temperature of a small flue are overhigh is avoided, the stability of the suction force of the flue is ensured, and the following table is a parameter table before and after the brick gas channel is sprayed and supplemented by a 2# coke oven full-flow grouting method in a coking workshop of a sand steel coking plant.
Drawings
FIG. 1 is a schematic view of a full-flow apparatus according to the present invention;
FIG. 2 is a graph showing the temperature of the transverse wall of a coke oven 20# in the coke plant 2# of Jiangsu sand Steel group Co., Ltd after the transverse wall is treated by the method of the embodiment 2 of the invention;
the numerical designations in the drawings represent the following: 1. a full flow tube; 2. inserting a pipe; 3. a feed pipe; 4. a feed hose; 5. a return hose.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
The blowby guniting repairing method for the coke oven is characterized in that the coke oven is a coke oven with downward-spraying gas supply, the gas flow of the coke oven is controlled by adding or subtracting a cock in a brick gas channel of the coke oven, the coke oven sends coke oven gas into the bottom of a vertical flue of a combustion chamber of the coke oven through a lower nozzle of the coke oven gas to be converged with air and then combusted, the lower nozzle of the coke oven gas comprises a four-way plug and a small adjusting hole plate, the four-way plug is arranged at the tail end of the lower nozzle of the coke oven gas and guides the coke oven gas into the gas channel of the coke oven, and the small adjusting hole plate is arranged at the joint of the lower nozzle of the coke oven gas and a:
closing blowby coke oven gas to be treated to add or subtract cock, unscrewing a four-way large and small plug of a lower spray pipe of the coke oven gas, and tightly plugging an adjusting small pore plate by using gauze;
and step two, uniformly mixing 30 parts of clay fire clay, 30 parts of silicon fire clay, 10 parts of phosphoric acid and 20 parts of industrial water by mass to obtain the guniting material.
Step three, connecting a full-flow device with a pulp sprayer and the coke oven gas lower spray pipe treated in the step one in sequence, referring to fig. 1, wherein the full-flow device comprises a full-flow pipe 1, an embedding pipe 2, a feeding pipe 3, a feeding hose 4, a backflow hose 5, a pressure release valve and a pulp storage barrel, the full-flow pipe 1 is adjustable in length, the top of the full-flow pipe 1 extends into the coke oven gas lower spray pipe, the embedding pipe 2 is a cylindrical pipe which is sealed at the bottom, hollow in the inside and open at the top end, the pipe diameter of the embedding pipe 2 is larger than that of the full-flow pipe, the bottom of the full-flow pipe 1 penetrates through the center of the bottom of the embedding pipe, the opening end of the embedding pipe 2 is in threaded connection with the tail end of the coke oven gas lower spray pipe, the discharging port of the feeding pipe 3 is connected with the pipe wall of the embedding pipe 2, the feeding port of the feeding, the other end is connected with the pulp storage barrel;
feeding the guniting material prepared in the step two into a shotcrete machine, wherein the shotcrete machine is provided with a compressed air valve and a pressure relief valve, opening the compressed air valve of the shotcrete machine to enable the pressure of the shotcrete machine to be suppressed to 0.4MPa, then opening the pressure relief valve between the shotcrete machine and a feeding hose 4, pressing the guniting material into a brick gas pipeline through a coke oven gas lower spray pipe, closing the pressure relief valve between the shotcrete machine and the feeding hose 4 and the compressed air valve on the shotcrete machine when slurry flows out from a backflow hose 5, and opening the pressure relief valve of the shotcrete machine;
step five, after the pressure of the pulp shooting machine is relieved, the full-flow device is dismounted, and the bamboo chips are used for rotating and cleaning the inner wall of the brick gas channel;
and step six, closing the four-way plug of the lower spray pipe of the coke oven gas, opening the treated blowby coke oven gas to add or subtract cock, and finishing the repairing process after detecting that the firing condition of the brick gas channel is normal.
Example 2
The blowby guniting repairing method for the coke oven is characterized in that the coke oven is a coke oven with downward-spraying gas supply, the gas flow of the coke oven is controlled by adding or subtracting a cock in a brick gas channel of the coke oven, the coke oven sends coke oven gas into the bottom of a vertical flue of a combustion chamber of the coke oven through a lower nozzle of the coke oven gas to be converged with air and then combusted, the lower nozzle of the coke oven gas comprises a four-way plug and a small adjusting hole plate, the four-way plug is arranged at the tail end of the lower nozzle of the coke oven gas and guides the coke oven gas into the gas channel of the coke oven, and the small adjusting hole plate is arranged at the joint of the lower nozzle of the coke oven gas and a:
step one, closing blowby coke oven gas to be treated to add or subtract cock, unscrewing a four-way big/small plug of a lower spray pipe of the coke oven gas, and tightly plugging an adjusting small pore plate by gauze.
And step two, uniformly mixing 30 parts of clay fire clay, 30 parts of silicon fire clay, 10 parts of phosphoric acid and 20 parts of industrial water by mass to obtain the guniting material. The density of the guniting material is 1.6 g/cm3。
And step three, connecting the full-flow device with a shotcrete machine and the coke oven gas lower spray pipe treated in the step one in sequence, wherein the shotcrete machine is a 0.8MPa ZSPB-5 type explosion-proof shotcrete machine. Referring to fig. 1, the full-flow device comprises a full-flow pipe 1, an embedding pipe 2, a feeding pipe 3, a feeding hose 4, a backflow hose 5, a pressure release valve and a pulp storage barrel. The full flow pipe 1 comprises two full flow short pipes with the same size, the bottom of each full flow short pipe is movably connected with the top of the other full flow short pipe, the top of the first full flow short pipe extends into the lower spray pipe of the coke oven gas, the bottom of the last full flow short pipe penetrates through the center of the bottom of the connecting pipe and is connected with the slurry storage barrel through a backflow hose, and one full flow short pipe or two full flow short pipes can be selected and used according to the height of a to-be-repaired brick gas pipeline during use. The embedded pipe 2 is a cylindrical pipe with a sealed bottom, a hollow interior and an open top, the pipe diameter of the embedded pipe 2 is larger than that of the full flow pipe 1, and the open end of the embedded pipe 2 is in threaded connection with the tail end of the coke oven gas lower spray pipe. The discharge hole of the feeding pipe 3 is connected with the pipe wall of the embedded pipe 2. The relief valve is DN15, 304 stainless steel ball valve, and the feed inlet of inlet pipe 3 is connected with the discharge gate of feeding hose 4, and the discharge gate of feeding hose 4 passes through the relief valve to be connected with the patching machine, and 5 one ends of backward flow hose are connected with full flow pipe 1, and the other end is connected with the storage bucket. The feeding hose 4 and the return hose 5 are rubber tubes.
And step four, sending the guniting material prepared in the step two into a shotcrete machine, wherein the shotcrete machine is provided with a compressed air valve and a pressure relief valve, opening the compressed air valve of the shotcrete machine to enable the pressure of the shotcrete machine to be suppressed to 0.4MPa, then opening the pressure relief valve between the shotcrete machine and the feeding hose 4, pressing the guniting material into a brick gas pipeline through a coke oven gas lower spray pipe, closing the pressure relief valve between the shotcrete machine and the feeding hose 4 and the compressed air valve on the shotcrete machine when slurry flows out from the backflow hose 5, and opening the pressure relief valve of the shotcrete machine.
And step five, after the pressure of the pulp shooting machine is relieved, the full-flow device is dismounted, and the bamboo chips are used for rotating and cleaning the inner wall of the brick gas channel.
And step six, closing the four-way plug of the lower spray pipe of the coke oven gas, opening the treated blowby coke oven gas to add or subtract cock, and finishing the repairing process after detecting that the firing condition of the brick gas channel is normal.
The method is used for gunning a brick gas channel in a sand steel coking workshop 2# coke oven by a full-flow mud jacking method, and parameters before and after gunning are detailed in the following table.
As can be seen from the table, 1, the method can effectively eliminate the blowby of the brick gas channel for a long time, the temperature of the vertical flue rises by about 60 to 80 ℃ before and after the blowby, and the single coke oven can save the coke oven gas by 700 m under the premise that the turnover time is not changed3/h。
2. The method can improve the uniformity of the transverse arrangement temperature, the transverse arrangement coefficient K after spray repair reaches more than 90 percent on the premise of reasonable distribution of the small pore plate adjusted by the lower spray pipe of the coke oven gas, the furnace temperature can be optimized, and the coke quality can be improved. FIG. 2 is a transverse wall curve diagram of a 2# coke oven 20# of a coking plant of Jiangsu sand Steel group Limited company, wherein the number of qualified fire paths is 27, and the transverse wall coefficient is 96% after the full-flow grouting method is carried out on the temperature of the transverse wall, and the method greatly optimizes the oven temperature and improves the coke quality.
3. The method can improve the temperature of the furnace end, improve the coke maturity of the furnace end, improve the coke quality of the furnace end and reduce the smoke generated by the coke.
Example 3
The difference from example 2 is that 27 parts of clay fire clay, 27 parts of silicon fire clay, 8 parts of phosphoric acid and 17 parts of industrial water are uniformly mixed in the second step to obtain a guniting material.
Example 4
The difference from example 2 is that in step two, 33 parts of clay fire clay, 33 parts of silicon fire clay, 12 parts of phosphoric acid and 23 parts of industrial water are uniformly mixed to obtain a guniting material.
Claims (6)
1. The blowby guniting repairing method for the coke oven is characterized in that the coke oven is a coke oven with downward-spraying gas supply, the gas flow of the coke oven is controlled by adding or subtracting a cock in the gas channel of the coke oven, the coke oven sends coke oven gas into the bottom of a vertical flue of a combustion chamber of the coke oven through a lower nozzle of the coke oven gas to be converged with air and then combusted, the lower nozzle of the coke oven gas comprises a four-way plug and a small adjusting hole plate, the four-way plug is arranged at the tail end of the lower nozzle of the coke oven gas and guides the coke oven gas into the gas channel of the coke oven, and the small adjusting hole plate is arranged at the joint of the lower nozzle of the coke oven gas and a transverse pipe and adjusts the:
closing blowby coke oven gas to be treated to add or subtract cock, unscrewing a four-way large and small plug of a lower spray pipe of the coke oven gas, and tightly plugging an adjusting small pore plate by using gauze;
step two, uniformly mixing 27-33 parts of clay fire clay, 27-33 parts of silicon fire clay, 8-12 parts of phosphoric acid and 17-23 parts of industrial water by mass to obtain a guniting material;
connecting a full-flow device with a pulp sprayer and the coke oven gas lower spray pipe treated in the first step in sequence, wherein the full-flow device comprises a full-flow pipe, an embedded pipe, a feeding hose, a backflow hose, a pressure release valve and a pulp storage barrel, the full-flow pipe is adjustable in length, the top of the full-flow pipe extends into the coke oven gas lower spray pipe, the embedded pipe is a cylindrical pipe which is sealed at the bottom, hollow in the inner part and open at the top end, the pipe diameter of the embedded pipe is larger than that of the full-flow pipe, the bottom of the full-flow pipe penetrates through the center of the bottom of the embedded pipe, the opening end of the embedded pipe is in threaded connection with the tail end of the coke oven gas lower spray pipe, the discharging port of the feeding pipe is connected with the wall of the embedded pipe, the feeding port of the feeding pipe is connected with the discharging port of;
feeding the guniting material prepared in the step two into a guniting machine, wherein the guniting machine is provided with a compressed air valve and a pressure relief valve, opening the compressed air valve of the guniting machine to enable the pressure of the guniting machine to be suppressed to 0.4MPa, then opening the pressure relief valve between the guniting machine and a feeding hose, pressing the guniting material into a brick gas pipeline through a coke oven gas lower nozzle, closing the pressure relief valve between the guniting machine and the feeding hose and the compressed air valve on the guniting machine when the slurry flows out from a backflow hose, and opening the pressure relief valve of the guniting machine to relieve the pressure;
step five, after the pressure of the pulp shooting machine is relieved, the full-flow device is dismounted, and the bamboo chips are used for rotating and cleaning the inner wall of the brick gas channel;
and step six, closing the four-way plug of the lower spray pipe of the coke oven gas, opening the treated blowby coke oven gas to add or subtract cock, and finishing the repairing process after detecting that the firing condition of the brick gas channel is normal.
2. The method for repairing the blowby guniting of the coke oven brick gas duct according to claim 1, wherein in the second step, 30 parts of clay fire clay, 30 parts of silicon fire clay, 10 parts of phosphoric acid and 20 parts of industrial water are uniformly mixed by mass to obtain guniting material.
3. The method for repairing blowby guniting of a coke oven brick gas duct according to claim 1, wherein the guniting machine in the third step is a 0.8MPa ZSPB-5 type explosion-proof guniting machine.
4. The method for repairing the blowby guniting of the coke oven brick gas duct according to claim 1, wherein the feed hose and the return hose in the third step are rubber pipes.
5. The method for repairing the blowby guniting of the coke oven brick gas duct according to claim 1, wherein the full flow pipe in the third step comprises at least two full flow short pipes with the same size, the bottom of each full flow short pipe is movably connected with the top of the other full flow short pipe, the top of the first full flow short pipe extends into the lower nozzle of the coke oven gas, and the bottom of the last full flow short pipe passes through the center of the bottom of the pipe fitting and is connected with the grout storage barrel through a return hose.
6. The method for repairing blowby guniting of a coke oven brick gas duct according to claim 1, wherein the pressure relief valve is a DN15, 304 stainless steel ball valve.
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| CN111718731A (en) * | 2020-07-07 | 2020-09-29 | 新疆八一钢铁股份有限公司 | Vertical flue guniting method for coke oven combustion chamber |
| CN113201356A (en) * | 2021-03-25 | 2021-08-03 | 宣化钢铁集团有限责任公司 | Coke oven brick gas duct plugging guniting device |
| CN115197723A (en) * | 2022-07-29 | 2022-10-18 | 天津铁厂有限公司 | Method for treating blowby of coke oven brick gas duct |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111718731A (en) * | 2020-07-07 | 2020-09-29 | 新疆八一钢铁股份有限公司 | Vertical flue guniting method for coke oven combustion chamber |
| CN111718731B (en) * | 2020-07-07 | 2021-07-06 | 新疆八钢南疆钢铁拜城有限公司 | Vertical flue guniting method for coke oven combustion chamber |
| CN113201356A (en) * | 2021-03-25 | 2021-08-03 | 宣化钢铁集团有限责任公司 | Coke oven brick gas duct plugging guniting device |
| CN115197723A (en) * | 2022-07-29 | 2022-10-18 | 天津铁厂有限公司 | Method for treating blowby of coke oven brick gas duct |
| CN115197723B (en) * | 2022-07-29 | 2023-10-31 | 天津铁厂有限公司 | Coke oven brick coal gas flue channeling treatment method |
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