WO2025046734A1 - コークス炉の補修方法 - Google Patents

コークス炉の補修方法 Download PDF

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Publication number
WO2025046734A1
WO2025046734A1 PCT/JP2023/031192 JP2023031192W WO2025046734A1 WO 2025046734 A1 WO2025046734 A1 WO 2025046734A1 JP 2023031192 W JP2023031192 W JP 2023031192W WO 2025046734 A1 WO2025046734 A1 WO 2025046734A1
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WO
WIPO (PCT)
Prior art keywords
bricks
combustion chamber
furnace wall
repaired
binder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2023/031192
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English (en)
French (fr)
Japanese (ja)
Inventor
康雅 福島
瑛人 白石
隆行 難波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
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JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to PCT/JP2023/031192 priority Critical patent/WO2025046734A1/ja
Priority to PCT/JP2024/025253 priority patent/WO2025047149A1/ja
Priority to JP2024562156A priority patent/JPWO2025047149A1/ja
Publication of WO2025046734A1 publication Critical patent/WO2025046734A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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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

Definitions

  • the present invention relates to a method for repairing a coke oven by hot repairing the coke oven by replacing the oven wall bricks that make up the oven wall separating the carbonization chamber and the combustion chamber.
  • a chamber-type coke oven has multiple carbonization chambers 51 and combustion chambers 52 above a heat storage chamber 53. These carbonization chambers 51 and combustion chambers 52 are formed alternately above the heat storage chamber 53, and multiple coal loading ports 54 are opened in the ceiling of each carbonization chamber 51. These coal loading ports 54 are for loading coal carried by a coal loading car 55 traveling above the coke oven into the carbonization chamber 51. The coal loaded into the carbonization chamber 51 from the coal loading port 54 is carbonized by heat from the combustion chamber 52, becoming red-hot coke, which is pushed out of the carbonization chamber 51 by an extruder 56.
  • the red-hot coke pushed out of the carbonization chamber 51 by the extruder 56 is then transferred to a fire extinguishing car 58 via a guide car 57, and transported by the fire extinguishing car 58 to a red-hot coke quenching facility (not shown).
  • the carbonization chamber 51, the combustion chamber 52 and the heat storage chamber 53 are constructed of a large number of bricks, and inside the combustion chamber 52, as shown in Figure 7, multiple flues (vertical flame ducts) 59 are formed along a direction (furnace length direction) perpendicular to the arrangement direction of the carbonization chamber 51 and the combustion chamber 52.
  • the carbonization chamber 51 also has a kiln opening into which the extrusion ram 56a (see Figure 6) of the extruder 56 is inserted, and a kiln opening from which the red-hot coke is extruded.
  • Backstays 60 made of H-shaped steel or the like are erected near these kiln openings to prevent deformation or collapse of the furnace walls.
  • the present invention aims to solve the above problems and provide a method for repairing coke ovens that, when hot repairing the bricks that make up the walls of the combustion chamber of a coke oven, prevents the remaining bricks of the adjacent combustion chamber or the unrepaired parts that remain undismantled from protruding into the carbonization chamber after repair.
  • the method of repairing a coke oven of the present invention is a method of repairing a combustion chamber brick of a coke oven by hot replacing two or more oven wall bricks and binder bricks from the oven mouth along the oven length direction, characterized in that it includes a confirmation step of observing the unevenness of the oven wall of the combustion chamber adjacent to the combustion chamber to be replaced with a three-dimensional measuring device from the oven mouth and confirming that the protrusion amount of the oven wall of the adjacent combustion chamber is less than a predetermined value, and a re-stacking step of dismantling the portion of the oven wall of the combustion chamber to be replaced that needs repair and stacking new oven wall bricks and binder bricks in the dismantled area when it is confirmed in the confirmation step that the protrusion amount of the oven wall of the adjacent combustion chamber is less than the predetermined value.
  • the method includes a step of using a preformed furnace wall refractory assembly and a preformed ceiling refractory assembly as the furnace wall and ceiling to be newly replaced in the combustion chamber to be replaced, (6) including a first new brick laying step of laying one flue of first new bricks, i.e., furnace wall bricks and binder bricks, on surfaces exposed as a result of the brick dismantling of the remaining furnace wall bricks and binder bricks of the non-repaired portion that remains after the dismantling; a heat insulating member attaching step of attaching heat insulating members to the exposed surfaces of the furnace wall bricks and binder bricks, i.e., the first new bricks, which account for one flue of the first new bricks laid in the first new brick laying step; and a second new brick laying step of laying second new bricks, i.e., furnace wall bricks and binder bricks, in the remaining repair range while removing the heat insulating member from the lower part.
  • the coke oven repair method of the present invention by observing the condition of the adjacent combustion chamber wall before dismantling the bricks of the combustion chamber to be repaired, it is possible to determine the range of oven wall bricks and binder bricks to be appropriately repaired, and the problem of the wall of the adjacent combustion chamber protruding into the coke chamber after repair can be solved.
  • FIG. 13 is a diagram for explaining repair when there is no overhang in the furnace wall of an adjacent combustion chamber.
  • FIG. 13 is a diagram for explaining repair when there is no overhang in the furnace wall of an adjacent combustion chamber.
  • FIG. 13 is a diagram for explaining repair when there is no overhang in the furnace wall of an adjacent combustion chamber.
  • FIG. 13 is a diagram for explaining repair when there is an overhang on the furnace wall of an adjacent combustion chamber.
  • FIG. 13 is a diagram for explaining repair when there is an overhang on the furnace wall of an adjacent combustion chamber.
  • FIG. 13 is a diagram for explaining repair when there is an overhang on the furnace wall of an adjacent combustion chamber.
  • FIG. 2 is a diagram for explaining an implementation state of the first embodiment.
  • FIG. 11 is a diagram for explaining the implementation state of the second embodiment.
  • FIG. 13 is a diagram for explaining the implementation state of the third embodiment.
  • FIG. 1 is a diagram for explaining an example of a known coke oven.
  • FIG. 1 is a top view
  • the present invention relates to a method for repairing a coke oven, and has been achieved based on the following findings.
  • Conventionally, in the method for repairing a coke oven when repairing a combustion chamber to be repaired, there was a problem that the furnace wall of the combustion chamber adjacent to the combustion chamber to be repaired protrudes toward the carbonization chamber.
  • the insulation panel cannot be installed properly, and as a result, the temperature of the adjacent combustion chamber drops and protrudes into the carbonization chamber.
  • Figures 1A to 1C are diagrams each for explaining repairs when there is no overhang on the furnace wall of an adjacent combustion chamber.
  • Figure 1A the unevenness of the furnace wall of the combustion chamber adjacent to the combustion chamber to be repaired is observed with a three-dimensional measuring device to confirm that the overhang of the furnace wall is less than a specified value.
  • Figure 1B a heat insulating panel is installed on the surface of the adjacent combustion chamber facing the combustion chamber to be repaired, and the replaced part of the combustion chamber to be repaired is dismantled.
  • Figure 1C the dismantled part of the combustion chamber to be repaired is replaced, and the combustion chamber to be repaired is repaired.
  • the adjacent combustion chambers where it was confirmed in Figure 1A that the overhang of the furnace wall is less than the specified value, none of them have any overhang of the furnace wall, as shown in Figure 1C.
  • Figures 2A to 2C are diagrams for explaining repairs when there is an overhang on the furnace wall of an adjacent combustion chamber.
  • Figure 2A shows an example of an observation in which the furnace wall of the combustion chamber adjacent to the upper side of the combustion chamber to be repaired overhangs a predetermined value or more, preferably 40 mm or more, and the furnace wall of the combustion chamber adjacent to the lower side of the combustion chamber to be repaired overhangs less than a predetermined value, preferably less than 40 mm.
  • an insulating panel is installed on the surface of the adjacent combustion chamber facing the combustion chamber to be repaired, and the re-installed part of the combustion chamber to be repaired is dismantled.
  • the overhanging part of the furnace wall of the upper combustion chamber that overhangs 40 mm or more gets in the way when installing the insulating panel.
  • the part is re-installed on the dismantled part of the combustion chamber to be repaired, and the combustion chamber to be repaired is repaired.
  • the coke oven repair method of the present invention is a method for repairing the combustion chamber bricks of a coke oven by hot replacing two or more oven wall bricks and binder bricks from the oven mouth along the oven length direction, and is characterized by including a confirmation step of observing the unevenness of the oven wall of the combustion chamber adjacent to the combustion chamber to be replaced with a three-dimensional measuring device from the oven mouth to confirm that the protrusion of the oven wall of the adjacent combustion chamber is equal to or less than a predetermined value, and a re-stacking step of dismantling the portion of the oven wall of the combustion chamber to be replaced that needs repair and stacking new oven wall bricks and binder bricks in the dismantled area if it is confirmed in the confirmation step that the protrusion of the oven wall of the adjacent combustion chamber is less than the predetermined value.
  • the predetermined value is preferably 40 mm.
  • the adjacent combustion chamber walls will no longer protrude into the carbonization chamber after repair.
  • the method for repairing a coke oven of the present invention includes a repair range determination step in which, before dismantling the portion of the combustion chamber that needs repair, the range of oven wall bricks and binder bricks that need repair is determined by observing the unevenness of the oven wall from the kiln mouth with a three-dimensional measuring device, and a step in which the convex parts of the oven wall determined in the repair range determination step are further confirmed from the flue hole, and the binder bricks that are closer to the kiln mouth than the binder bricks determined to be sound are dismantled up to the binder bricks.
  • the coke oven repair method of the present invention when hot repairing the bricks that make up the furnace wall of the combustion chamber of a coke oven, the remaining bricks in the unrepaired portion of the combustion chamber that is left undismantled to repair will not protrude toward the carbonization chamber after repair.
  • a more preferred embodiment is a method for repairing a coke oven using techniques already publicly known in patent publications and published publications, as exemplified below.
  • the coke oven repair method of the present invention preferably includes a step of reinforcing the rails by providing a gap between the underside of the coal car rail support and the ceiling, where the coal car load does not directly act, when the range of oven wall bricks and binder bricks requiring repair includes the coal car rails, as described in Patent Document 2 (Patent Publication No. 6,183,800).
  • the coke oven repair method of the present invention can accurately suppress damage to the ceiling where the coal car rail support is installed (damage and deformation of the ceiling bricks and joints).
  • the coke oven repair method of the present invention preferably includes a step of maintaining the furnace wall temperature of the combustion chamber adjacent to the combustion chamber to be replaced, and the furnace wall temperature of the non-replacement combustion chamber portion of the combustion chamber to be replaced where the binder bricks have been confirmed to be sound, at 400°C or higher.
  • the coke oven repair method of the present invention can provide a partial coke oven re-installation repair method that improves construction efficiency and has little or no risk of overhang or falling off.
  • the method for repairing a coke oven of the present invention preferably includes a first new brick stacking step of stacking one flue of first new bricks, i.e., furnace wall bricks and binder bricks, on the surfaces exposed as a result of brick dismantling of the furnace wall bricks and binder bricks that are the remaining bricks of the non-repaired portion that remains after dismantling, a heat insulating member attaching step of attaching a heat insulating member to the exposed surfaces of the furnace wall bricks and binder bricks that are the first new bricks stacked in the first new brick stacking step, and a second new brick stacking step of stacking the second new bricks, i.e., furnace wall bricks and binder bricks, in the remaining repair range while removing the heat insulating member from the lower part.
  • a first new brick stacking step of stacking one flue of first new bricks, i.e., furnace wall bricks and binder bricks, on the surfaces exposed as a result of brick dis
  • the amount of heat radiation from the surfaces exposed as a result of brick dismantling can be reduced even in the upper part of the remaining bricks of the non-repaired portion of the combustion chamber to be repaired, and the temperature drop from the upper part to the lower part of the remaining bricks can be suppressed.
  • the method for repairing a coke oven of the present invention preferably includes the steps of: forming a joint that penetrates vertically at the boundary between the oven wall portion that has been re-repaired and the oven wall portion that has not been repaired, and re-stacking the oven wall bricks; arranging, at the boundary and its vicinity, a non-repair side anti-pull-out member so as to span between at least the oven wall bricks of the non-repaired portion and the oven wall surface facing the oven wall bricks and the space of the coking chamber, and a repair side anti-pull-out member so as to span between at least the oven wall bricks of the oven wall portion that has been re-repaired and the oven wall surface facing the oven wall bricks and the space of the coking chamber, within the coking chamber; and, after the temperature is raised, spraying a thermal spray material into the joint that is the gap at the boundary between the bricks of the re-repaired
  • the coke oven repair method of the present invention it is possible to minimize the protrusion of the boundary between the repaired and unrepaired parts when the temperature of the coke oven oven wall bricks is raised again, and deformation of the oven wall bricks during hot repair can be suppressed.
  • a first extrusion prevention member is installed in a second coke oven between a first adjacent combustion oven adjacent to the repair combustion oven to be repaired in the oven width direction and a second adjacent combustion oven beyond that, at a position including at least a position corresponding to the first binder brick from the oven mouth among a plurality of binder bricks forming the first adjacent combustion oven, the first extrusion prevention member maintaining a constant width of the second coke oven at that position
  • extrusion of the oven wall bricks of the repaired combustion chamber and the first adjacent combustion chamber adjacent to this repaired combustion chamber can be appropriately prevented when repairing the oven wall bricks and partition bricks near the oven mouth of the combustion chamber.
  • Example 1 As shown in Figure 3, for the combustion chamber to be repaired and the two combustion chambers adjacent to the combustion chamber to be repaired that constitute the coke oven, the unevenness of the furnace walls was measured using a laser scanner at a predetermined position of the kiln mouth bricks of the adjacent combustion chambers before and after the combustion chamber to be repaired was replaced. In addition, before the combustion chamber to be repaired was replaced, the presence or absence of cracks was observed from the flue hole. The results are shown in Table 1 below.
  • Example 2 As shown in Figure 4, in an example in which bricks to prevent kiln mouth extension were placed between a combustion chamber to be repaired and two combustion chambers adjacent to the combustion chamber to be repaired that constitute a coke oven, a laser scanner was used to measure the unevenness of the oven wall at a specified position on the kiln mouth bricks of the adjacent combustion chambers before and after the bricks were replaced with the combustion chamber to be repaired. In addition, before the combustion chamber to be repaired was replaced, the presence or absence of cracks was observed from the flue hole. The results are shown in Table 2 below.
  • Example 3 As shown in Figure 5, a case was investigated in which a part of a combustion chamber was left in place when it was replaced (repaired).
  • bricks to prevent kiln mouth extension were placed between the combustion chamber to be partially repaired and the two combustion chambers adjacent to the combustion chamber to be repaired, before and after the replacement of the combustion chamber to be repaired, the unevenness of the oven wall was measured using a laser scanner at a specified position of the kiln mouth bricks of the adjacent combustion chamber.
  • the presence or absence of cracks was observed through the flue hole. The results are shown in Table 3 below.
  • the range of oven wall bricks and binder bricks to be appropriately repaired can be determined by observing the condition of the wall of the adjacent combustion chamber before dismantling the bricks of the combustion chamber to be repaired. This solves the problem of the wall of the adjacent combustion chamber protruding into the coke chamber after repair, which is industrially useful.

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  • 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)
PCT/JP2023/031192 2023-08-29 2023-08-29 コークス炉の補修方法 Pending WO2025046734A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2023/031192 WO2025046734A1 (ja) 2023-08-29 2023-08-29 コークス炉の補修方法
PCT/JP2024/025253 WO2025047149A1 (ja) 2023-08-29 2024-07-12 コークス炉の補修方法
JP2024562156A JPWO2025047149A1 (https=) 2023-08-29 2024-07-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/031192 WO2025046734A1 (ja) 2023-08-29 2023-08-29 コークス炉の補修方法

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PCT/JP2024/025253 Pending WO2025047149A1 (ja) 2023-08-29 2024-07-12 コークス炉の補修方法

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000313882A (ja) * 1999-03-03 2000-11-14 Sumitomo Metal Ind Ltd コークス炉炉壁煉瓦熱間積替え時の非積替え煉瓦の拘束方法
JP2004203966A (ja) * 2002-12-24 2004-07-22 Kansai Coke & Chem Co Ltd コークス炉炉壁状況の評価方法
JP2013082909A (ja) * 2011-09-28 2013-05-09 Jfe Steel Corp コークス炉の炉壁診断方法およびコークス炉の炉壁補修方法
JP5365040B2 (ja) * 2008-03-25 2013-12-11 Ｊｆｅスチール株式会社 コークス炉の補修方法
JP5991478B2 (ja) * 2012-11-01 2016-09-14 Ｊｆｅスチール株式会社 コークス炉の部分積替え補修方法
JP6183800B2 (ja) * 2013-06-19 2017-08-23 Ｊｆｅスチール株式会社 コークス炉および装炭車軌条受台の設置方法
JP2019108510A (ja) * 2017-12-20 2019-07-04 Ｊｆｅスチール株式会社 室炉式コークス炉の補修方法
JP6753389B2 (ja) * 2017-12-20 2020-09-09 Ｊｆｅスチール株式会社 室炉式コークス炉の補修方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59187082A (ja) * 1983-04-08 1984-10-24 Nippon Steel Corp コ−クス炉炭化室炉底煉瓦の補修法
JP5347614B2 (ja) 2009-03-19 2013-11-20 Ｊｆｅスチール株式会社 コークス炉の熱間補修方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000313882A (ja) * 1999-03-03 2000-11-14 Sumitomo Metal Ind Ltd コークス炉炉壁煉瓦熱間積替え時の非積替え煉瓦の拘束方法
JP2004203966A (ja) * 2002-12-24 2004-07-22 Kansai Coke & Chem Co Ltd コークス炉炉壁状況の評価方法
JP5365040B2 (ja) * 2008-03-25 2013-12-11 Ｊｆｅスチール株式会社 コークス炉の補修方法
JP2013082909A (ja) * 2011-09-28 2013-05-09 Jfe Steel Corp コークス炉の炉壁診断方法およびコークス炉の炉壁補修方法
JP5991478B2 (ja) * 2012-11-01 2016-09-14 Ｊｆｅスチール株式会社 コークス炉の部分積替え補修方法
JP6183800B2 (ja) * 2013-06-19 2017-08-23 Ｊｆｅスチール株式会社 コークス炉および装炭車軌条受台の設置方法
JP2019108510A (ja) * 2017-12-20 2019-07-04 Ｊｆｅスチール株式会社 室炉式コークス炉の補修方法
JP6753389B2 (ja) * 2017-12-20 2020-09-09 Ｊｆｅスチール株式会社 室炉式コークス炉の補修方法

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