JP4407478B2 - How to check and repair cooling tower refractories in coke dry fire extinguishing equipment - Google Patents

Description

  The present invention relates to a method for inspecting and repairing a refractory inside a cooling tower of a coke dry fire extinguishing facility, and more particularly to a method for improving the efficiency of work related to the inspection and repair of a refractory in a cooling tower and ensuring the safety of workers.

  FIG. 1 is a schematic side view of a coke oven. In the figure, the coke oven is composed of a carbonization chamber 1, an extruder 2, and a guide wheel 3. Coal is carbonized in the carbonization chamber 1 to become red hot coke. The red hot coke discharged from the carbonization chamber 1 passes through the guide wheel 3 and enters the fire extinguisher bucket 4.

  FIG. 2 is a schematic explanatory diagram of the coke dry fire extinguishing equipment. In the figure, the coke dry fire extinguishing equipment includes a cooling tower 8 that forms the main body, a boiler 6 that uses the waste heat, and a hoisting machine for the fire truck bucket 4. First, the fire extinguisher bucket 4 described above contains the red hot coke discharged from the coke oven carbonization chamber, and is appropriately transported to a predetermined position near the coke dry fire extinguishing equipment via a conveyance path. The red hot coke is lifted up to the upper part of the cooling tower 8 by the hoisting machine 5 of the coke dry fire extinguishing equipment together with the fire extinguisher bucket 4, and the red hot coke is introduced into the cooling tower from the inlet 9 at the top of the cooling tower 8. The red-hot cooling tower coke 12 charged into the cooling tower 8 is cooled by heat exchange with an inert gas indicated by an arrow in FIG. At this time, the inert gas whose temperature has been raised by heat exchange is cooled by exchanging heat with the boiler 6 when passing through the adjacent boiler 6, and passes through the circulation fan 7 to recirculate into the cooling tower 8. It is composed. The cooled coke is discharged from the cutting device 10 at the lower part of the cooling tower and is mainly sent to the blast furnace by the belt conveyor 11.

  The inside of the cooling tower 8 associated with such a coke dry fire extinguishing system is composed of a refractory, but the refractory is always subject to temperature fluctuations and wear due to contact with high-temperature coke. As a result, damage such as wear occurs, and inspection / repair of the refractory (hereinafter, also simply referred to as “repair”) becomes necessary.

  In general, as described in Patent Document 1, a method for repairing a refractory in a coke dry fire extinguishing equipment, after discharging all the high-temperature coke inside the cooling tower 8, from the lower part in the cooling tower as shown in FIG. The work scaffolding 14 is assembled to the repair level, and the worker 13 repairs using the work scaffolding. In addition, the furnace temperature at this time is about 30-60 degreeC normally.

  However, this repair method naturally cools the temperature of the refractory in the cooling tower, so that the area around the damaged part during operation is further expanded, and the cooling tower is being repaired during the assembly work of the scaffold or during the refractory repair. The danger of dropping damaged refractories 16 from the top is always accompanied by a problem in ensuring the safety of the worker 13. In addition, the repair work is performed at a high place because the work is carried out on the assembled work scaffold 14, and after the coke inside the cooling tower 8 is completely discharged, the work scaffold is assembled and then the refractory repair is performed for a long period of time. A repair period is required.

Conventionally, coke for flooring may be used in the lower part of the work scaffold, but since coke for flooring is carried from the lower part of the coke dry fire extinguishing equipment, when workers carry the flooring coke. There is the same danger as the assembly of the work platform, and even if it is carried in using a belt conveyor etc., the floor coke is not flat. Work is required, and a similar danger occurs.
JP 7-33245 A

  An object of the present invention is to develop a method for ensuring the safety of workers and shortening the repair period when inspecting and repairing refractories inside a cooling tower of a coke oven dry fire extinguishing facility.

  In the broadest sense, the present invention, after the cooled coke is introduced into the cooling tower from the inlet at the top of the cooling tower, the coke layer is used as a scaffold, for example, inspection and inspection of refractories from the cooling tower to the bottom. This is a method for checking and repairing a refractory in a cooling tower, characterized by performing repairs.

  By repairing and inspecting the refractory damaged part from the top of the cooling tower to the bottom in accordance with the present invention, the fall of the damaged refractory from the overhead of the worker during assembly of the work scaffold or when repairing the refractory at the bottom of the cooling tower. It is possible to avoid the danger of workers due to the above. In addition, inside the cooling tower, workers can be released from work on scaffolds involving high-altitude work by riding on a cooled coke layer or laying a floorboard on the coke layer, so that the worker's feet can be stabilized. Can be secured.

  Furthermore, in the present invention, work scaffold assembly and dismantling, which has been conventionally required for repairing the refractory inside the cooling tower, is not performed, and the work scaffold is secured by a coke layer in the cooling tower that is put into the cooling tower from a fire extinguisher bucket. Moreover, the level adjustment of the coke layer in the cooling tower can be easily performed by controlling the cutting device, and the work period is shortened compared with the conventional inspection / repair work.

Embodiments of the present invention will be specifically described with reference to the accompanying drawings.
First, even in the present invention, the coke dry-type fire extinguishing equipment itself is, for example, the conventional one shown in FIG. 2, and the inspection and repair of the internal refractory of the cooling tower constituting the same is performed. The prior operation itself may be the same as the conventional one.

  When repair work is started according to the present invention, supply of red hot coke to the cooling tower in FIG. 2 is first stopped. Specifically, the transportation of the fire extinguisher bucket 4 that stores the red hot coke discharged from the coke oven carbonization chamber is stopped, and the charging of the red hot coke using the hoist 5 to the charging inlet is stopped. At this point, the coke already charged into the cooling tower (in-furnace coke) continues to be cooled as it is, while the cooling coke is continuously discharged from the cutting device. As a result, the top height of the in-furnace coke, that is, the coke layer level or the in-furnace coke level is gradually decreased.

  When the in-furnace coke level reaches a predetermined level, or when all the in-furnace coke is discharged from the cooling tower, the cooling coke is charged from the charging inlet at the top of the cooling tower. This is to ensure the target coke layer level.

  At this time, an operator enters the furnace from the inlet of the top of the cooling tower, and inspection and repair of the refractory starts at the coke layer level at that time. The inspection / repair work itself may be the same as the conventional one, and is not particularly limited in the present invention.

FIG. 4A is an explanatory diagram schematically showing the state at this time.
When all the in-furnace coke is discharged in advance, the cooling coke is introduced to the vicinity of the top of the cooling tower to obtain a target coke layer level.

  In this way, after the reddish coke 12 in the cooling tower 8 of the coke dry fire extinguishing equipment is completely discharged or lowered to a predetermined level, the cooling tower 8 is cooled, and the cooled coke is introduced from the inlet 9 of the cooling tower 8. This is because carbon monoxide (CO) is generated when the red hot coke cannot be cooled completely.

  Usually, the temperature at the top of the furnace in the cooling tower 8 when the charging of the red hot coke is stopped is approximately 800 to 1000 ° C., and the furnace after exhausting the entire amount of coke in the furnace for about 24 hours after the idling operation of the circulating fan 7 The internal temperature is approximately 200 ° C or less. By simply putting cooling coke into the furnace, the furnace temperature becomes about 50 ° C, and the furnace is at a temperature at which an operator can immediately start working. Therefore, it is only necessary to prevent the generation of CO gas.

The cooled coke is mounted in advance in a bucket truck of a dry fire extinguishing equipment, and charged from the inlet 9 to the top of the cooling tower 8.
Next, the coke layer level in the furnace is lowered to a level at which the worker does not need a work scaffold at the inspection / repair location of the refractory in the furnace. The lowering method is performed by adjusting the discharge amount discharged from the cutting device 10 in the lower part of the cooling tower 8 of the dry fire extinguishing equipment. At this time, cooling coke may be continuously added to further reduce the furnace temperature.

  Although the coke in the cooling tower charged in this way has a slight mountain shape due to the angle of repose, there is no problem in the work of directly inspecting and repairing on the coke layer 12 in the cooling tower. Degree. If necessary, the floor plate 15 may be laid on the coke layer 12 to perform the work.

  After the repair work for the relevant part is completed, the above discharge work is repeated, and the target coke layer level is successively lowered, and the refractory in the furnace is inspected and repaired at that position each time.

FIG. 4B is a schematic explanatory view of the state when the in-furnace coke layer level is further lowered.
4 (a) and 4 (b), the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals.
By inspecting and repairing the refractory inside the cooling tower 8 from the upper part of the cooling tower 8 toward the bottom in this way, the upper part of the cooling tower 8 has already been repaired when repairing the refractory at the lower part of the cooling tower 8. Therefore, it is possible to prevent the damaged refractory 16 from falling.

  Further, in the present invention, a working scaffold is secured by the coke layer 12 in the cooling tower that is charged into the cooling tower 8 from the fire extinguisher bucket 4, and the level of the coke layer 12 in the cooling tower is adjusted by the cutting device 10. Compared to the repair period of assembly and dismantling of the work platform, it can be significantly shortened.

Examples of the present invention are shown below.
Stop the charging of red hot coke from the inlet 9 at the top of the cooling tower 8 of the dry fire extinguishing equipment, and operate the circulation fan 7 from the cutting device 10 installed in the cooling tower 8 at the lower part of the cooling tower 8. While discharging the whole amount.

  After operating the circulation fan 7 and confirming that the temperature in the cooling tower 8 is cooled to 100 to 120 ° C., the circulation fan 7 is stopped, and the cooled coke is put into the fire extinguisher bucket 4, and the hoisting machine 5 Is lifted up to the top of the cooling tower 8, and charged from the inlet 9 to the top of the cooling tower 8. After completion of charging to about 2 to 3 m below the furnace top, the worker 13 enters the cooling tower 8 through the inlet 9, and the worker 13 cools on the coke layer 12 in the cooling tower or on the floor board 15 laid on the coke. Inspect and repair the refractory in the upper part of the tower 8.

  After the inspection and repair of the refractory in the upper part of the cooling tower 8 is completed, the worker 13 in the cooling tower 8 retreats from the cooling tower 8 and the coke 12 in the cooling tower is installed at the lower part of the cooling tower 8. 10 and lower the level of the coke layer 12 in the cooling tower to the target level.

  When the coke 12 in the cooling tower is lowered to the target level, the worker 13 enters the cooling tower 8 again from the manhole next to the inlet 9 or the cooling tower 8, and the floor board laid on the coke 12 in the cooling tower or on the coke. On 15, the worker 13 inspects and repairs the refractory in the cooling tower 8.

  Thereafter, the coke 12 in the cooling tower is sequentially discharged from the cutting device 10 to lower the coke layer 12 in the cooling tower to a target repair level each time, and the refractory in the cooling tower 8 is inspected and repaired. . This is continued until reaching the bottom of the cooling tower.

  The internal repair period of the cooling tower 8 is 12 hours shorter in the present invention than the conventional repair period for assembling and dismantling the work scaffold for repairing the refractory inside the cooling tower 8, and the coke dry fire extinguishing Cost deterioration due to prolonged equipment outage period is suppressed. Of course, the work itself has become easier and the risk of work has been greatly reduced.

  In this example, coke that has been cooled after discharging the entire amount of coke in the furnace is put into the cooling tower 8, but since the cooling effect at the bottom of the cooling tower 8 is high, the coke remains at a predetermined level below the cooling tower, The same effect as in the above example can be expected even if the power is input to the target level.

It is a schematic side view of a coke oven. It is a schematic diagram of a coke dry digestion fire cooling facility. It is explanatory drawing of the conventional cooling tower inside repair condition. 4 (a) and 4 (b) are explanatory diagrams of the state of inspection / repair of the cooling tower according to the present invention, respectively.

Explanation of symbols

1: Carbonization chamber 7: Circulating fan 13: Worker 2: Extruder 8: Cooling tower 14: Working scaffold 3: Guide wheel 9: Inlet 15: Floor plate 4: Fire extinguisher bucket 10: Cutting device 16: Damaged refractory Falling object 5: hoisting machine 11: belt conveyor 6: boiler 12: coke layer in cooling tower

Claims (2)

  When inspecting and repairing refractories in the cooling tower of a dry fire extinguishing system in which red hot coke is charged into the cooling tower, the red hot coke is stopped in the cooling tower and is present inside the cooling tower. Coke is discharged from the cooling tower while cooling the coke, and the level of the coke layer in the cooling tower is lowered to a predetermined level. Then, the already cooled coke is charged into the cooling tower to obtain the desired coke layer level. And a method for checking and repairing a cooling tower refractory of a coke dry-type fire extinguishing system, characterized by inspecting and repairing a damaged portion of the refractory at the position of the coke layer.   After stopping the charging of red hot coke and discharging the entire amount of coke existing inside the cooling tower, the coke that has already been cooled is thrown into the cooling tower to achieve the desired coke layer level. The method for checking and repairing the cooling tower refractory of the coke dry fire extinguishing equipment according to claim 1.

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