JP-7856169-B2 - Coke oven repair methods

JP7856169B2JP 7856169 B2JP7856169 B2JP 7856169B2JP-7856169-B2

Inventors

福島康雅
白石瑛人
難波隆行

Assignees

ＪＦＥスチール株式会社

Dates

Publication Date: 20260511
Application Date: 20240712
Priority Date: 20230829

Claims (8)

A method for repairing a coke oven, which involves repairing the bricks of one combustion chamber or multiple consecutive combustion chambers that make up the coke oven by rearranging two or more furnace wall bricks and binder bricks along the length of the furnace from the oven opening while the oven is hot. From the previously determined data on the compaction rate and the amount of brick overhang, the following equation (1) was obtained by regression analysis. Clogging rate (%) = 5 × 10 -8 × d 5 ... (1) Here, d (mm) is the amount of overhang. From the above formula (1), a predetermined value is determined as the predetermined value of the overhang amount, which is the amount of overhang d that can ensure a compression rate that does not hinder normal operation. A verification step in which the irregularities of the furnace walls of adjacent non-transferring combustion chambers adjacent to one side and adjacent non-transferring combustion chambers adjacent to the other side of the single transferring combustion chamber or multiple consecutive transferring combustion chambers are observed using a three-dimensional measuring instrument from the furnace opening, and it is confirmed that the amount of protrusion of each of the furnace walls of the adjacent non-transferring combustion chambers is less than the predetermined value, If, in the aforementioned verification step, it is confirmed that the overhang of the furnace wall of the adjacent non-transferred combustion chamber is less than the predetermined value, a transfer step is performed in which the necessary repairs to the furnace wall of one or more consecutive transferred combustion chambers are dismantled, and new furnace wall bricks and binder bricks are laid in the dismantled area. A method for repairing a coke oven, characterized by including the following.
The method for repairing a coke oven according to claim 1, characterized in that the value that ensures a packing rate that does not hinder normal operation is 5%, and by calculating d from formula ( 1 ), the predetermined value of the overhang is 40 mm.
Before dismantling the parts of the aforementioned transshipment combustion chamber that require repair, a repair area determination process is performed in which the extent of the furnace wall bricks and binder bricks requiring repair is determined by observing the irregularities of the furnace wall from the kiln opening using a three-dimensional measuring instrument. The process involves further checking the protrusions of the furnace wall determined in the aforementioned repair scope determination process through the flue hole, and dismantling the binder bricks up to those closer to the kiln opening than the binder bricks that were determined to be sound, A method for repairing a coke oven according to claim 1, characterized by including the following.
If the area of the furnace wall bricks and binder bricks requiring repair includes the coal-charging car rails, The process involves creating a gap between the lower surface and the upper part of the coal-charging car rail support, so that the coal-charging car load does not directly act on it, thereby reinforcing the rail. A method for repairing a coke oven according to any one of claims 1 to 3 , characterized by including the following:
A step of maintaining the furnace wall temperature of the adjacent non-transfer combustion chamber adjacent to the aforementioned transfer combustion chamber, and the furnace wall temperature of the unrepaired portion of the combustion chamber within the transfer combustion chamber in which the binder bricks have been confirmed to be sound, at 400°C or higher. A method for repairing a coke oven according to any one of claims 1 to 3 , characterized by including the following:
The first new bricklaying process involves laying one flue of new bricks, consisting of furnace wall bricks and binder bricks, onto the surface of the remaining bricks of the unrepaired section, which are the furnace wall bricks and binder bricks, that are exposed as a result of the brick demolition. The process includes an insulation member application step in which an insulation member is applied to the exposed surface of the furnace wall bricks and binder bricks, which constitute one flue of the first new bricks laid in the first new brick laying step, In the remaining repair area, the second new brickwork process involves stacking the furnace wall bricks and binder bricks, which are the second new brickwork, while removing the insulation material from the bottom. A method for repairing a coke oven according to any one of claims 1 to 3 , characterized by including the following:
The process involves creating vertically penetrating joints at the boundary between the repaired and unrepaired sections of the furnace wall and then replacing the furnace wall bricks. The process of raising the temperature of the furnace after arranging, in the boundary portion and its vicinity, at least the furnace wall bricks of the unrepaired portion and the unrepaired side overhang prevention member so as to span between the furnace wall bricks and the furnace wall surface facing each other across the space of the carbonization chamber, and at least the furnace wall bricks of the re-repaired portion and the repaired side overhang prevention member so as to span between the furnace wall bricks and the furnace wall surface facing each other across the space of the carbonization chamber, within the carbonization chamber, After heating, the process involves spraying thermal spray material into the joints, which are the gaps at the boundary between the bricks of the rebuilt and repaired portion and the bricks of the unrepaired portion. A method for repairing a coke oven according to any one of claims 1 to 3 , characterized by including the following:
A first overhang prevention member installation step involves installing a first overhang prevention member in a second carbonization chamber between the re-storage combustion chamber to be repaired, a first adjacent non-storage combustion chamber adjacent in the furnace width direction, and a second adjacent non-storage combustion chamber further beyond, at a position that includes at least the position corresponding to the first binder brick from the kiln mouth among the plurality of binder bricks forming the first adjacent non-storage combustion chamber, thereby maintaining a constant width of the second carbonization chamber at that position. The repair process involves dismantling and replacing the furnace wall bricks and binder bricks in the repaired section of the aforementioned re-carrying combustion chamber, A second overhang prevention member installation step involves installing a second overhang prevention member in the first carbonization chamber between the re-sequenced combustion chamber and the first adjacent non-sequenced combustion chamber, at a position that includes at least the position corresponding to the first binder brick from the kiln opening among the plurality of binder bricks forming the re-sequenced combustion chamber, to maintain a constant width of the first carbonization chamber at that position; A heating step for raising the temperature of the re-combustion chamber that has been re-combusted, A method for repairing a coke oven according to any one of claims 1 to 3 , characterized by including the following:

Description

The present invention relates to a method for repairing a coke oven, which involves replacing the furnace wall bricks that make up the furnace wall separating the carbonization chamber and the combustion chamber, thereby repairing the coke oven while it is still hot. Generally, as shown in Figure 7, a chamber-type coke oven has carbonization chambers 51 and combustion chambers 52 arranged alternately above a heat storage chamber 53, forming a furnace cluster of a certain number of units. Multiple charging ports 54 are provided in the ceiling of each carbonization chamber 51. These charging ports 54 are for loading coal, transported by a charging car 55 that travels on top of the coke oven, into the carbonization chamber 51. The coal loaded into the carbonization chamber 51 through the charging ports 54 undergoes carbonization due to heat from the combustion chamber 52, becoming red-hot coke, which is then 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 via a guide car 57 to a fire extinguishing car 58, which transports the coke to a red-hot coke extinguishing facility (not shown). The carbonization chamber 51, combustion chamber 52, and heat storage chamber 53 are constructed of numerous bricks. Inside the combustion chamber 52, as shown in Figure 8, multiple flues (vertical flame channels) 59 are formed along a direction perpendicular to the arrangement direction of the carbonization chamber 51 and combustion chamber 52 (furnace length direction). The carbonization chamber 51 also has a furnace opening into which the extrusion ram 56a (see Figure 7) of the extruder 56 is inserted, and a furnace opening from which the red-hot coke is extruded. Near these furnace openings, backstays 60 (see Figure 8), made of H-shaped steel or the like, are erected to prevent deformation or collapse of the furnace wall. In such coke ovens, the wall-forming bricks that make up the walls of the combustion chamber 52 can become severely worn. Therefore, conventionally, repairs to the coke oven have been carried out while it is hot by replacing severely worn wall-forming bricks with new bricks (see, for example, Patent Document 1). Furthermore, various methods are known for repairing by replacement (see Patent Documents 2-6). Patent No. 5347614Patent No. 6183800Patent No. 5991478Patent No. 6753389Patent No. 5365040Japanese Patent Publication No. 2019-108510 This diagram illustrates repair procedures for adjacent non-transshipment combustion chambers when there are no overhangs on the furnace wall.This diagram illustrates repair procedures for adjacent non-transshipment combustion chambers when there are no overhangs on the furnace wall.This diagram illustrates repair procedures for adjacent non-transshipment combustion chambers when there are no overhangs on the furnace wall.This diagram illustrates the repair process when there is an overhang on the furnace wall of an adjacent non-transshipment combustion chamber.This diagram illustrates the repair process when there is an overhang on the furnace wall of an adjacent non-transshipment combustion chamber.This diagram illustrates the repair process when there is an overhang on the furnace wall of an adjacent non-transshipment combustion chamber.This is a diagram illustrating the implementation state of Example 1.This is a diagram illustrating the implementation state of Example 2.This is a diagram illustrating the implementation state of Example 3.This graph shows the relationship between the compression rate and the overhang amount when the coal charge is 30 tons, which is the total amount of coal charged.This is a diagram illustrating an example of a known coke oven.This is a view of a known coke oven from above. The embodiments of the present invention will be described in detail below. The following embodiments are illustrative examples of methods for realizing the technical concept of the present invention and do not limit the configuration to those described below. That is, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims. <Summary of the present invention> This invention relates to a method for repairing coke ovens and is based on the following findings. Conventionally, in coke oven repair methods, when repairing the transshipment combustion chamber to be repaired, there was a problem in that the furnace wall of the adjacent non-transshipment combustion chamber protruded into the carbonization chamber. Furthermore, if the adjacent non-transshipment combustion chamber protruded significantly, it was not possible to properly install the insulation panel, resulting in a decrease in the temperature of the adjacent non-transshipment combustion chamber, which also caused it to protrude into the carbonization chamber. To solve these problems, the condition of the furnace wall of the adjacen