WO2024028991A1 - コークス炉の炉壁形状測定方法およびコークス炉の炉壁補修方法 - Google Patents
コークス炉の炉壁形状測定方法およびコークス炉の炉壁補修方法 Download PDFInfo
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- WO2024028991A1 WO2024028991A1 PCT/JP2022/029710 JP2022029710W WO2024028991A1 WO 2024028991 A1 WO2024028991 A1 WO 2024028991A1 JP 2022029710 W JP2022029710 W JP 2022029710W WO 2024028991 A1 WO2024028991 A1 WO 2024028991A1
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- furnace
- laser
- furnace wall
- carbonization chamber
- coke oven
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- 239000000571 coke Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008439 repair process Effects 0.000 title claims description 13
- 238000000691 measurement method Methods 0.000 title abstract 3
- 238000003763 carbonization Methods 0.000 claims abstract description 77
- 238000005259 measurement Methods 0.000 claims abstract description 36
- 238000004939 coking Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 abstract description 21
- 239000011449 brick Substances 0.000 description 15
- 238000001125 extrusion Methods 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000272875 Ardeidae Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
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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
Definitions
- the present invention relates to an oven wall shape measuring method for measuring the oven wall shape of a coking chamber in a coke oven, and a coke oven oven wall repair method.
- a coke oven is constructed by stacking bricks glued together with a thin layer of mortar and then tightening them from the front, back, left and right to maintain their shape.
- a coke oven has a heat storage chamber on the foundation, and above it there is a cavity called a carbonization chamber that is about 6 m high, about 400 mm wide, and about 16 m deep, and a combustion chamber about 900 mm wide that burns fuel gas. They are arranged in alternating directions, with a brick ceiling above.
- a coke oven In a coke oven, the heat from burning fuel inside the combustion chamber is passed through the wall bricks of the combustion chamber to heat the carbonization chamber to over 1000°C. Coal is introduced through the charging hole at the top of the chamber, and the coal is carbonized to create coke. Manufacture. An extrusion ram is inserted into the coke cake after carbonization through one of the kiln ports, which are about 6 m high and about 400 mm wide, at both ends of the carbonization chamber, and the coke cake inside the carbonization chamber is discharged from the other kiln port. After construction is completed, the coke oven burns fuel internally to gradually raise the temperature of the bricks to over 1000 degrees Celsius. This brick temperature is maintained until the coke oven is shut down.
- the wall brick that separates the combustion chamber from the carbonization chamber is called the furnace wall, and plays the role of shielding combustion gas from flowing into the carbonization chamber, transmitting combustion heat to the carbonization chamber, and supporting the ceiling.
- a ceiling load and a furnace clamping force always act on the furnace wall, and an extrusion ram load and an extrusion friction force temporarily act on the furnace wall during extrusion.
- the ceiling load and furnace clamping force play a role in stabilizing the furnace wall structure, but as the furnace wall ages, the following problems will occur in the furnace wall.
- a joint break that creates a gap at the joint of the furnace wall (2) A defect in which one or more bricks come off from the furnace wall. (3) Egret, where the bricks are worn away and thinned on the wide side of the furnace wall. (4) An overhang where bricks fall down on the wide side of the furnace wall and come out on the carbonization chamber side.
- the bricks may collapse. Furthermore, if unevenness occurs on the furnace wall due to erosion, chipping, overhang, etc., the distance between the left and right furnace wall surfaces of the carbonization chamber (the furnace width) changes from the design dimension, which deteriorates coke extrusion properties. For this reason, if an egre, a defect, or an overhang occurs on the furnace wall, it is necessary to build up the wall by spraying irregularly shaped materials or thermal spraying, replace the brick for the defect, and reload the bricks for the overhang. Repairs have been carried out to restore the furnace wall to a healthy condition.
- Patent Documents 1 and 2 disclose that a laser three-dimensional shape measuring device is installed outside the carbonization chamber, and the furnace wall inside the carbonization chamber is irradiated with a laser.
- a coke oven oven wall diagnostic method for measuring the oven wall shape of a coke oven is disclosed.
- the present invention has been made in view of the problems of the prior art, and its purpose is to provide a method for measuring the shape of a coke oven wall that can prevent deformation of laser irradiation holes and detection holes due to radiant heat from a coke oven.
- An object of the present invention is to provide a method for repairing a coke oven wall.
- the gist of the present invention capable of solving the above problems is as follows.
- a furnace wall of a coke oven in which a laser three-dimensional shape measuring device is installed outside the carbonization chamber from which the furnace lid has been removed, and the shape of the furnace wall of the coking chamber is measured using the laser three-dimensional shape measuring device.
- the shape measuring method includes the time from the removal of the furnace lid to the start of measurement with the laser three-dimensional shape measuring device, and the time from the kiln opening to the laser three-dimensional shape measuring device so as to satisfy the following formula (1).
- a coke oven oven wall shape measuring method which measures the oven wall shape by determining a distance to a shape measuring device.
- T W is the furnace temperature (K) in the carbonization chamber
- t is the time (min) from removing the furnace lid to starting measurement with the laser three-dimensional shape measuring device
- L is This is the distance (m) from the kiln mouth to the laser three-dimensional shape measuring device.
- the laser irradiation hole and detection Heat deformation of the holes can be prevented.
- the shape of the coke oven wall can be measured using the laser three-dimensional shape measuring device, and the wall of the coke oven can be repaired based on the shape data of the coke oven obtained through the measurement.
- FIG. 1 is a schematic perspective view showing a state in which the shape of the furnace wall of the coke oven 10 is measured by the method for measuring the shape of the furnace wall of a coke oven according to the present embodiment.
- FIG. 2 is a schematic diagram illustrating radiant heat released from the carbonization chamber.
- FIG. 1 is a schematic perspective view showing a state in which the shape of the furnace wall of the coking chamber 10 is measured by the method for measuring the shape of the furnace wall of a coke oven according to the present embodiment.
- the shape of the oven wall of the coking chamber 10 in the coke oven 1 is measured by a laser three-dimensional shape measuring device 20 installed on a platform 30 in front of the coking chamber 10.
- the laser three-dimensional shape measuring device 20 irradiates a laser 21 obliquely toward the furnace wall 13 from the kiln mouth 11 with the furnace cover 12 removed from the laser irradiation hole, and detects the reflected light from the furnace wall 13 through the detection hole.
- This is a device that measures the shape of the furnace wall of the carbonization chamber 10 as a point group by receiving light.
- the laser three-dimensional shape measuring device 20 it is preferable to measure the shape of the left and right furnace walls of the carbonization chamber 10 separately.
- the carbonization chamber 10 has a size of about 6 m in height, about 400 mm in width, and about 16 m in depth on the upper side, and the kiln opening 11 has an elongated structure with a width of about 400 mm and a height of about 6 m.
- the laser 21 When the laser 21 is incident at such a shallow angle, if the furnace wall 13 is protruding, the depth thereof becomes a shadow and the laser 21 cannot reach it, making it impossible to measure the shape of the furnace wall.
- the incident angle of the laser 21 can be made large with respect to the furnace wall 13, so even if the furnace wall 13 is protruding, the shape of the furnace wall can be measured.
- the left and right furnace wall shape data measured by the laser three-dimensional shape measuring device 20 may be evaluated separately, or these two furnace wall shape data may be combined based on the reference objects around the carbonization chamber 10. , it may be evaluated as one piece of synthesis furnace wall shape data.
- the uneven state of the furnace wall 13 can be quantified by calculating an average plane from the measured point group and calculating the distance of each point from the average plane. The distance may be calculated by calculating the distance between each point and the average plane in the normal direction, or by calculating the distance in the width direction of the carbonization chamber 10. In this way, the uneven state of the furnace wall 13 can be confirmed using the two furnace wall shape data.
- the distance between the left and right furnace walls is important in determining whether the extrusion ram can pass through the carbonization chamber 10 smoothly.
- the distance between the left and right furnace walls is calculated using one composite furnace wall shape data that is obtained by combining the left and right furnace wall shape data based on the reference objects around the carbonization chamber 10. It is preferable to calculate
- At least two dedicated reference bodies 22 are installed around the kiln mouth 11, and the positions of the reference bodies 22 are measured at the same time as the shapes of the left and right furnace walls are measured.
- the center position of the reference body 22 in each measurement data is calculated. Since the positional relationship of the reference bodies 22 does not change, find a one-to-one correspondence of the center positions of the reference bodies 22 in the left and right furnace wall shape data, and move the furnace wall shape data of one side so that they overlap.
- two pieces of furnace wall shape data can be combined into one composite furnace wall shape data.
- the reference body 22 may be one used exclusively for the laser three-dimensional shape measuring device 20, or if there is one around the carbonization chamber 10 whose position can be easily specified, it may be used.
- a member called a furnace frame is provided near the kiln mouth 11. Since the furnace frame is replaced and repaired when it becomes damaged and is attached using the furnace wall 13 as a reference, the furnace frame may be used as a reference instead of the reference body 22 described above. As a result, the relative positional relationship between the left and right furnace walls 13 becomes clear, and one composite furnace wall shape data can be created with high accuracy.
- the width of the oven on the side where the coke cake is extruded is made approximately 30 mm wider than the width on the side where the extrusion ram is inserted. It has a tapered shape. That is, since tapers of about 30 mm are provided on both sides for a depth of 16 m, deviations may occur in the evaluation of the uneven state using the average plane calculated from individual furnace wall shape data.
- synthetic furnace wall shape data that combines the left and right furnace wall shape data, the degree of expansion of the kiln width becomes clear, and by comparing it with the design shape data, the uneven state of the furnace wall 13 can be determined. Can be accurately grasped.
- the furnace wall shape of the carbonization chamber 10 in the coke oven 1 can be measured. Furthermore, by comparing the furnace wall shape data obtained by measuring the furnace wall shape of the carbonization chamber 10 with the design shape data, it is possible to detect the deformation state of the furnace wall 13 (irregularities of the furnace wall and changes in the furnace width). Based on the deformed state, the furnace wall 13 can be easily repaired.
- the laser irradiation hole and the detection hole are affected by the radiant heat from the carbonization chamber 10. In some cases, the shape of the furnace wall could not be measured due to deformation.
- the time period from when the oven cover 12 of the coking chamber 10 is removed to when the laser three-dimensional shape measuring device 20 starts measuring the oven wall shape is determined. Then, the shape of the furnace wall of the carbonization chamber 10 is measured. When a predetermined period of time elapses after removing the furnace lid 12, the temperature inside the carbonization chamber 10 decreases, and the radiant heat from the carbonization chamber 10 decreases, thereby preventing deformation of the laser irradiation hole and the detection hole. This allows the furnace wall shape to be measured using the laser three-dimensional shape measuring device 20.
- the furnace lid 12 of the carbonization chamber 10 is If the laser three-dimensional shape measuring device 20 is installed and measured 10 minutes after removal, the laser irradiation hole and detection hole will not be deformed, and the furnace wall shape will be measured using the laser three-dimensional shape measuring device 20. can.
- the radiant heat from the carbonization chamber 10 changes depending on the furnace temperature of the carbonization chamber 10, the time from removing the furnace lid 12 to starting measurement, and the distance from the kiln mouth 11 to the laser three-dimensional shape measuring device 20.
- the furnace temperature of the carbonization chamber 10 is T W
- the time from removing the furnace lid 12 to starting measurement of the furnace wall shape is t
- the kiln opening 11 to the laser three-dimensional shape measuring device 20 is Letting L be the distance, time t and distance L are determined so as to satisfy the following equation (1).
- starting the measurement of the furnace wall shape means installing the laser three-dimensional shape measuring device 20 and starting measuring the furnace wall shape, or starting the measurement of the furnace wall shape by installing the laser three-dimensional shape measuring device 20 This means that the heat-resistant cloth of the dimensional shape measuring device 20 is removed and the measurement of the furnace wall shape is started.
- T W is the furnace temperature (K) of the carbonization chamber 10
- t is the time (min) from when the furnace cover 12 is removed until the measurement is started by the laser three-dimensional shape measuring device 20
- L is the distance (m) from the kiln mouth 11 to the laser three-dimensional shape measuring device 20.
- the laser irradiation hole and the detection hole are not deformed, and the furnace wall 13 in the carbonization chamber 10 can be measured using the laser three-dimensional shape measuring device 20. Be able to measure the shape of.
- FIG. 2 is a schematic diagram illustrating radiant heat released from the carbonization chamber.
- the above equation (1) will be explained using FIG. 2.
- the furnace lid 12 is provided at two locations: a coke side (the side where coke is pushed out) and a machine side (the side where coke is pushed out by the extrusion ram). Therefore, in order to measure the entire surface of the furnace wall 13, it is sufficient to measure from the kiln mouth 11 on each furnace lid 12 side to the center 8 m of the furnace wall 13. Therefore, after a predetermined period of time has passed since the furnace lid 12 is removed, the typical temperature position of the furnace temperature in the carbonization chamber 10 is considered to be the center position (4m position) in the depth direction of the carbonization chamber 10 at 8m. , we considered radiant heat from this position.
- the time of the radiant effect is inversely proportional to the square of the distance, so the time of the radiant effect at the position P2 at the distance L from the kiln mouth 11 after 10 minutes has passed since the furnace cover 12 is removed is Considering the radiant heat at position P1 at a distance of 1.5 m from P11 as a reference, it can be expressed by the following equation (2).
- the value calculated by substituting the furnace temperature T W : 1150+273K, distance L: 1.5 m, and time t: 10 minutes into the above equation (3) is "4.1 ⁇ 10 12 ".
- the distance L was 1.5 m
- the time t was 10 minutes
- the above equation (1) is derived.
- the laser three-dimensional shape measuring device 20 in order to irradiate a furnace wall with a height of 6 m with the laser 21, it is necessary to install the laser three-dimensional shape measuring device 20 at a distance of 1.5 m or more from the kiln mouth 11. Further, due to the size restriction of the platform 30, it is necessary to install the laser three-dimensional shape measuring device 20 within 3.0 m from the kiln mouth 11. Therefore, the distance L from the kiln mouth 11 to the laser three-dimensional shape measuring device 20 needs to satisfy the following formula (4). 1.5 ⁇ L ⁇ 3.0...(4)
- Table 1 is a table showing the values on the left side of the above equation (1) under each condition when the furnace temperature of the carbonization chamber 10 is 1150°C.
- Table 2 is a table showing the values on the left side of the above equation (1) under each condition when the furnace temperature of the carbonization chamber 10 is 1100°C.
- Table 3 is a table showing the values on the left side of the above equation (1) under each condition when the furnace temperature of the carbonization chamber 10 is 1000°C.
- the laser irradiation hole and detection It can be seen that deformation of the hole can be prevented.
- the temperature inside the carbonization chamber 10 is 1150° C. when coke is produced with the operating rate of the coke oven at 135%.
- the operation rate of 135% means that if a coke oven is equipped with 100 carbonization chambers, the coke will be extruded 135 times in one day to produce coke. Since coke is never produced at a utilization rate higher than 135%, the furnace temperature of 1150° C. can be said to be the highest temperature in the furnace of the carbonization chamber 10. Even at the highest temperature inside the furnace and at the shortest distance of 1.5 m from the kiln mouth 11, the time from removing the furnace lid 12 to starting the measurement of the furnace wall shape must be at least 10 minutes.
- the furnace temperature at the kiln opening 11 can be increased to 600°C or higher. was maintained. From this result, in order to prevent the furnace temperature at the kiln mouth 11 from falling below 600°C, if the furnace wall shape measurement time is set to 5 minutes, the laser It is preferable to start measuring the furnace wall shape using the dimensional shape measuring device 20. Thereby, even after the measurement, the temperature inside the furnace at the kiln mouth 11 can be prevented from becoming less than 600° C., and the bricks in the carbonization chamber 10 can be prevented from cracking.
- the temperature inside the coking chamber 10 is measured after removing the oven cover 12 so as to satisfy the above equation (1). Since the time until the start and the distance from the kiln mouth 11 to the laser three-dimensional shape measuring device are determined, thermal deformation of the laser irradiation hole and the detection hole can be prevented. This makes it possible to measure the shape of coke oven walls using a laser three-dimensional shape measuring device, and to repair coke oven walls based on the wall shape data obtained through this measurement. .
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Abstract
Description
(2)炉壁からレンガが1個ないし複数個外れてしまう欠損。
(3)炉壁の広い面でレンガが磨耗して減肉するエグレ。
(4)炉壁の広い面でレンガが倒れて炭化室側に出てくる張出し。
[1] 炉蓋を取り外した炭化室の外側にレーザー式3次元形状測定装置を設置し、前記レーザー式3次元形状測定装置を用いて前記炭化室の炉壁形状を測定するコークス炉の炉壁形状測定方法であって、下記(1)式を満たすように、前記炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間と、窯口から前記レーザー式3次元形状測定装置までの距離とを定めて前記炉壁形状を測定する、コークス炉の炉壁形状測定方法。
(10/t)/{(L+4)/5.5}2×TW 4≦4.1×1012・・・(1)
ここで、TWは炭化室の炉内温度(K)であり、tは炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間(min)であり、Lは前記窯口から前記レーザー式3次元形状測定装置までの距離(m)である。
[2] 前記炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間は10分以上である、[1]に記載のコークス炉の炉壁形状測定方法。
[3] 前記炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間は60分以内である、[1]または[2]に記載のコークス炉の炉壁形状測定方法。
[4] [1]または[2]に記載のコークス炉の炉壁形状測定方法で測定された炉壁形状に基づいて前記炭化室の炉壁を補修する、コークス炉の炉壁補修方法。
[5] [3]に記載のコークス炉の炉壁形状測定方法で測定された炉壁形状に基づいて前記炭化室の炉壁を補修する、コークス炉の炉壁補修方法。
ここで、TWは炭化室10の炉内温度(K)であり、tは炉蓋12を取り外してからレーザー式3次元形状測定装置20で測定を開始するまでの時間(min)であり、Lは窯口11からレーザー式3次元形状測定装置20までの距離(m)である。
1.5≦L≦3.0・・・(4)
10 炭化室
11 窯口
12 炉蓋
13 炉壁
20 レーザー式3次元形状測定装置
21 レーザー
22 基準体
30 プラットフォーム
Claims (5)
- 炉蓋を取り外した炭化室の外側にレーザー式3次元形状測定装置を設置し、前記レーザー式3次元形状測定装置を用いて前記炭化室の炉壁形状を測定するコークス炉の炉壁形状測定方法であって、
下記(1)式を満たすように、前記炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間と、窯口から前記レーザー式3次元形状測定装置までの距離とを定めて前記炉壁形状を測定する、コークス炉の炉壁形状測定方法。
(10/t)/{(L+4)/5.5}2×TW 4≦4.1×1012・・・(1)
ここで、TWは炭化室の炉内温度(K)であり、tは炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間(min)であり、Lは前記窯口から前記レーザー式3次元形状測定装置までの距離(m)である。 - 前記炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間は10分以上である、請求項1に記載のコークス炉の炉壁形状測定方法。
- 前記炉蓋を取り外してから前記レーザー式3次元形状測定装置で測定を開始するまでの時間は60分以内である、請求項1または請求項2に記載のコークス炉の炉壁形状測定方法。
- 請求項1または請求項2に記載のコークス炉の炉壁形状測定方法で測定された炉壁形状に基づいて前記炭化室の炉壁を補修する、コークス炉の炉壁補修方法。
- 請求項3に記載のコークス炉の炉壁形状測定方法で測定された炉壁形状に基づいて前記炭化室の炉壁を補修する、コークス炉の炉壁補修方法。
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PCT/JP2022/029710 WO2024028991A1 (ja) | 2022-08-02 | 2022-08-02 | コークス炉の炉壁形状測定方法およびコークス炉の炉壁補修方法 |
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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 |
JP2014218557A (ja) | 2013-05-07 | 2014-11-20 | Jfeスチール株式会社 | 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 |
JP2016038386A (ja) * | 2014-08-08 | 2016-03-22 | Jfeスチール株式会社 | コークス炉炉長測定方法およびコークス炉炉体劣化評価方法 |
JP2019522089A (ja) * | 2016-06-30 | 2019-08-08 | サントル・ドゥ・ピロリーズ・デュ・シャルボン・ドゥ・マリエノ | コークス炉の壁部分の形状を測定するための装置 |
JP2020002320A (ja) * | 2018-06-29 | 2020-01-09 | 鎬榮 李 | コークス炉とコークス炉のドアフレームの診断装置および診断システム |
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