JP4972766B2 - Coke oven furnace wall repair device - Google Patents

Description

  The present invention relates to a method and an apparatus for repairing a furnace wall brick in a carbonizing chamber of a coke oven for producing coke by dry distillation of coal, and particularly to an apparatus having excellent continuous workability.

  FIG. 5 shows a schematic structure of a coke oven. A coke oven 600 has a structure in which combustion chambers 610 and carbonization chambers 620 are alternately arranged. As shown in FIG. 6, the carbonization chamber 620 is manufactured by dry distillation of coal. When the coke is pushed out in the direction of arrow C, the carbon adhering to the furnace wall 630 becomes an extrusion resistance, and a part of the carbon and the furnace wall 630 is pushed out together with the coke to cause a defect in the furnace wall 630.

  The defect generated in the furnace wall 630 has a maximum depth of about 36.5 mm, and in order to increase the extrusion force, the repair that smoothes the furnace wall 630 sprays the sprayed material and oxygen on the damaged furnace wall 630. Is performed regularly.

  Patent Document 1 relates to a coke oven thermal spray repair apparatus and repair method, and a thermal spray repair apparatus is attached to a slide drive machine having a lift drive at the tip of a free beam that enters and exits the carbonization chamber, and the spray drive burner is attached to the lift drive; A lance drive machine with a trowel that smoothes the sprayed material sprayed on the wall surface is attached, and a utility for spraying is attached to the beam to improve the operability, thereby repairing the spraying in idle time of operation. Are described.

  Patent Documents 2 and 3 relate to a coke oven repair device. Patent Document 2 discloses that a multistage expansion / contraction lance having a spray nozzle or the like attached to the tip thereof can be rotated in a horizontal plane and around the lance axis, A repair device is described that enables observation and repair of a lance without replacing the entire lance.

Patent Document 3 discloses a positioning carriage that can move in the depth direction and width direction of the coking oven of the coke oven, and can move in the depth direction of the coking chamber that is mounted on the positioning carriage, and can be mounted with a spray nozzle or the like. A repair device with an insertion trolley for installing a simple beam is described.
JP-A-9-302354 JP 7-126638 A JP 2003-321679 A

  By the way, the actual operation of coke is continuous operation, and the repair work of the furnace wall of the carbonization chamber is performed in parallel with the actual operation of coke, so repair work time is required to prevent interference with coke oven moving machines such as extruders. Is required to be minimized.

  In particular, in order to improve the repair work efficiency, by making the spraying conditions appropriate in the spray repair work, the occurrence of backfire due to rebound of the sprayed material and blocking the injection port is prevented, and the work efficiency is reduced. It is strongly desired to suppress the increase in repair time due to

  However, in Patent Document 1, an outrigger is installed at the bottom of the furnace in order to prevent deflection of the beam, but the bottom surface of the coke oven carbonization chamber is not flat and coke lump remains to guarantee the level of the beam. This is difficult, and there is a problem in properly controlling the spraying position, resulting in a reduction in repair efficiency.

Further, in Patent Document 2, the lance is a multistage expansion / contraction method, and when the lance is expanded / contracted, the displacement becomes large due to bending and backlash, and the spraying position cannot be controlled with high accuracy, thereby hindering the repair efficiency. Further, Patent Document 3 does not disclose at all about prevention of misfire or flashback and improving repair efficiency.
Then, an object of this invention is to provide the furnace wall repair method and furnace wall repair apparatus which can perform the stable continuous repair work.

The object of the present invention can be achieved by the following means.
1. Positioning cart that can move in the width direction of the carbonization chamber of the coke oven, an insertion cart that can be moved in the depth direction of the carbonization chamber placed on the positioning cart, and can be raised and lowered on the insertion cart A furnace wall repairing device comprising: a beam formed; an elevation driving means for raising and lowering the beam installed on the insertion carriage; and a thermal spraying device for repairing a furnace wall installed at a tip of the beam;
The thermal spraying device has a thermal spray nozzle, two laser distance meters, a monitoring optical system head, and an illumination device arranged in a housing, and the thermal spray nozzle, the monitoring optical system head, and the illumination device are in the housing. And a structure that can rotate around the beam axis,
The two laser rangefinders are fixed to the beam so that the irradiation directions of the beams are opposite to each other by 180 ° and perpendicular to the furnace wall,
The laser distance meter uses a visible light semiconductor laser having a wavelength of 650 nm for distance measurement,
The illumination lamp of the illumination device has a ballast with a built-in igniter and a color temperature of 3000K.
After spraying the wall surface with the distance between the spray nozzle tip and the furnace wall set to 40 mm to 47.5 mm by either one of the laser rangefinders, the casing is rotated half a turn (180 °), and the spray nozzle and the monitoring optics A thermal spraying apparatus in which the system head and the lighting device are opposed to the other wall surface and the distance between the tip of the thermal spray nozzle and the furnace wall is set to 40 mm to 47.5 mm by the other distance meter of the laser rangefinder so that the wall surface can be sprayed. A furnace wall repair device characterized by being.

  According to the present invention, since the occurrence of misfire or flashback is suppressed during thermal spraying during furnace wall repair, stable continuous furnace wall repair work is possible, which is extremely useful industrially.

  The present invention is characterized in that, in repairing a furnace wall by thermal spraying, the thermal spraying apparatus is miniaturized, and the distance between the thermal spraying apparatus and the furnace wall is set to a distance that does not cause misfire or flashback during thermal spraying. Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 2 is a diagram showing the positional relationship between the spraying device 7 and the furnace wall 63 at the furnace side of the extruder (hereinafter referred to as PS) when repairing the furnace wall 63 of the carbonization chamber 61. It is attached to the tip of the beam 3 of the furnace wall repair device (not shown), and the interval l between the thermal spraying device 7 and the furnace wall 63 is constant during thermal spraying.

  In the figure, the interval l is the interval between the tip of the thermal spray nozzle in the thermal spraying device 7 and the furnace wall 63. In general, the carbonization chamber 61 has a shape that widens from the PS to the coke guide wheel side (hereinafter referred to as CS), and the interval l is the shortest distance in the PS kiln.

  Moreover, although the space | interval of the thermal spraying apparatus 7 and the furnace wall 63 is made the same with right and left in the figure, this invention is not limited.

  In the furnace wall repairing method according to the present invention, thermal spraying is performed with the interval l between the tip of the thermal spray nozzle of the thermal spray apparatus and the furnace wall being 40 mm or more. If the distance between the tip of the thermal spray nozzle of the thermal spraying device and the furnace wall is less than 40 mm, misfire or flashback occurs and spraying becomes impossible.

  FIG. 1 is a view showing an example of a furnace wall repairing apparatus suitable for carrying out the furnace wall repairing method according to the present invention. In the figure, 1 is a furnace wall repairing apparatus, 2 is an insertion carriage, 3 is a beam, 4 is an elevation drive Mechanism 5 is a positioning carriage, 6 is a carbonization chamber, 7 is a thermal spraying device, and 8 is a beam support means.

  The furnace wall repair device 1 includes a positioning carriage 5, an insertion carriage 2, a beam 3 having a thermal spraying device 7 attached to the tip thereof, and an elevation drive mechanism 4 for the beam 3.

  The positioning carriage 5 moves on a track (extruder rail) laid in front of the PS kiln of the coking oven 6 in the coke oven so as to be movable in the width direction of the coking chamber 6 (not shown). The insertion carriage 2 that is movable in the depth direction of the carbonization chamber 6 is placed on the positioning carriage 5.

  A beam 3 having a thermal spraying device 7 attached to its tip and a raising / lowering driving means 4 for raising and lowering the beam 3 via a beam support means 8 are mounted on the insertion carriage 2. Is placed.

  The furnace wall repair work may be carried out sequentially at the PS and CS kilns, or from either kiln, and is not particularly defined in the present invention.

  FIG. 3 is a schematic diagram for explaining an example of the structure of the thermal spraying apparatus 7 suitable for use in the furnace wall repairing method according to the present invention, and shows a cross section (hereinafter referred to as a longitudinal cross section) of the beam 3 on the extension in the axial direction. .

  In the figure, 7 is a spraying device, 71 is a spraying nozzle, 72a and 72b are laser distance meters for controlling the distance l between the spraying nozzle 71 and the furnace wall 63, and 73 is a monitoring optical for monitoring the spraying situation. The system head 74 is an illuminating device that irradiates the sprayed part so that the spraying status can be monitored, and 75 is provided so that the distance can be measured by the laser distance meters 72a and 72b and the monitoring optical system head 73 can be monitored. , An opening provided so that the spraying unit 74 can illuminate the sprayed part, 77 a spraying nozzle supply system in which a spraying material supply hose and a gas supply hose for spraying are bundled, and 78 an optical system head Reference numeral 73 denotes a power-signal cable, and 79 denotes a casing.

  FIG. 4 is a schematic diagram for explaining the arrangement of the thermal spray nozzle 71, the laser distance meters 72a and 72b, and the monitoring optical system head 73 in a cross-sectional direction orthogonal to the axial direction of the beam 3 (hereinafter referred to as a cross section perpendicular to the beam). (A) shows the arrangement of the laser distance meters 72 a and 72 b and the monitoring optical system head 73 in the casing 79, and (b) shows the arrangement of the thermal spray nozzle 71 in the casing 79.

  Inside the casing 79 of the thermal spraying device 7, the thermal spray nozzle 71, the laser distance meters 72 a and 72 b, the monitoring optical system head 73, and the illumination device 74 are arranged in this order from the front end to the beam 3 attached. .

  The spray nozzle 71 is arranged so that the spray direction is perpendicular to the furnace wall 63, and the laser distance meters 72 a and 72 b accurately measure the distance from the tip of the spray nozzle 71 to the furnace wall 63 (hereinafter, spray distance) 1. As much as possible, it is arranged as close to the spray nozzle 71 as possible.

  The observation illumination device 74 and the monitoring optical system head 73 of the sprayed part are irradiated with the irradiation light of the illumination device 74 through the opening 76 to irradiate the sprayed part, and the operator of the furnace wall repair device monitors through the opening 75. Any position may be used as long as the spraying state can be observed with the optical system head 73 for the optical system, and the position is appropriately selected inside the housing 79.

  The thermal spraying device 7 includes a thermal spray nozzle 71, a monitoring optical system head 73, and an illumination device among the thermal spray nozzle 71, the laser distance meters 72 a and 72 b, the monitoring optical system head 73, and the illumination device 74 disposed in the housing 79. 74 has a structure that can rotate around the axis of the beam 3 integrally with the housing 79.

  In order to accurately measure the distance, the laser distance meters 72a and 72b use a support mechanism (not shown) so that the beam 3 is irradiated in a direction opposite to each other by 180 ° and perpendicular to the furnace wall 63. Secure to.

  When repairing the furnace wall of the carbonization chamber, after spraying one furnace wall 63 with the distance between the furnace wall 63 measured by the laser distance meter 72a and the spray nozzle 71 within the range of the present invention, the casing 79 is rotated half a turn. (Rotate 180 °) and spray the thermal spray nozzle 71, the monitoring optical system head 73, and the illumination device 74 facing the other wall surface.

  At this time, the distance between the furnace wall 63 and the spray nozzle 71 is measured by irradiating the laser from the laser distance meter 72b from the opening 75 of the housing.

  The laser distance meters 72a and 72b use a visible light semiconductor laser with a wavelength of 650 nm for distance measurement, and the illumination device 74 has a ballast with a built-in igniter as a lamp and has a color temperature of 3000K. In the furnace wall spraying repair of the carbonization chamber having a general size and shape, the apparatus 3 can be reduced in size so that the interval l between the spray nozzle (3) and the furnace wall 63 can be 40 mm or more.

  The furnace wall is repaired by inserting the furnace wall spraying device shown in Fig. 1 into the carbonization chamber with a depth of 16m, a height of 6m, a kiln opening of PS of 0.395m, and a CS of 0.465m. It was.

  In the thermal spraying apparatus shown in FIG. 3, the laser distance meter uses a visible light semiconductor laser having a wavelength of 650 nm for distance measurement, the illuminating device has a ballast with a built-in igniter as a lamp, and the color temperature is 3000K. A certain thing was used and the outer diameter of the thermal spraying apparatus was 300 mm.

  When the thermal spray repair is performed for the case where the distance between the tip of the thermal spraying nozzle of the thermal spraying apparatus and the furnace wall is 47.5 mm and 40 mm, no misfire or flashback occurs during the thermal spraying operation in any case. It was.

  As the spraying capability, a spraying amount of 49 kg / hr was obtained when the distance between the tip of the spraying nozzle and the furnace wall was 47.5 mm, and 40 kg / hr when 40 mm.

  Next, the laser distance meter is an infrared semiconductor laser with a wavelength of 780 nm for distance measurement, and the illumination device has an igniter-separated ballast as a lamp, and has a color temperature of 6500K. A thermal spraying apparatus having a thickness of 330 mm was used, and thermal spraying was performed only from PS for each of cases where the distance between the tip of the thermal spraying nozzle of the thermal spraying apparatus and the furnace wall was 32.5 mm and 25 mm.

  As a result, in both cases, misfires and flashbacks occurred during the spraying operation, and the spraying capability was 22 kg / hr when the distance between the tip of the spray nozzle and the furnace wall was 32.5 mm, and 20 kg when 25 mm. The amount of thermal spraying was / hr.

Schematic of the in-furnace thermal spray repair apparatus suitable for implementation of this invention. The figure explaining the positional relationship of the thermal spraying apparatus and furnace wall in the PS side kiln. Schematic explaining an example of the structure of the thermal spraying apparatus suitable for use with the furnace wall repair method which concerns on this invention. FIG. 2 is a schematic diagram for explaining the arrangement of a thermal spray nozzle, a laser distance meter, and a monitoring optical system head in a cross section at right angles, (a) is an arrangement of a laser distance meter and a monitoring optical system head, and (b) is a thermal spraying. The figure which shows arrangement | positioning of a nozzle. The figure explaining the structure of a coke oven. The figure explaining the structure of a carbonization chamber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Furnace wall repair apparatus 2 Plug carriage 3 Beam 4 Lift drive mechanism 5 Positioning carriage 6 Carbonization chamber 7 Thermal spraying device 8 Beam support means 61 Carbonization chamber 62 Combustion chamber 63 Furnace wall 71 Thermal spray nozzles 72a and 72b Laser distance meter 73 For monitoring Optical system head 74 Illumination device 75, 76 Opening 77 Thermal spray nozzle supply system 78 in which thermal spray material supply hose and thermal spray gas supply hose are bundled Optical head power-signal cable 79 Housing 600 Coke oven 610 Combustion chamber 620 Carbonization chamber 630 furnace wall

Claims (1)

Positioning cart that can move in the width direction of the carbonization chamber of the coke oven, an insertion cart that can be moved in the depth direction of the carbonization chamber placed on the positioning cart, and can be raised and lowered on the insertion cart A furnace wall repairing device comprising: a beam formed; an elevation driving means for raising and lowering the beam installed on the insertion carriage; and a thermal spraying device for repairing a furnace wall installed at a tip of the beam;
The thermal spraying device has a thermal spray nozzle, two laser distance meters, a monitoring optical system head, and an illumination device arranged in a housing, and the thermal spray nozzle, the monitoring optical system head, and the illumination device are in the housing. And a structure that can rotate around the beam axis,
The two laser rangefinders are fixed to the beam so that the irradiation directions of the beams are opposite to each other by 180 ° and perpendicular to the furnace wall,
The laser distance meter uses a visible light semiconductor laser having a wavelength of 650 nm for distance measurement,
The illumination lamp of the illumination device has a ballast with a built-in igniter and a color temperature of 3000K.
After spraying the wall surface with the distance between the spray nozzle tip and the furnace wall set to 40 mm to 47.5 mm by either one of the laser rangefinders, the casing is rotated half a turn (180 °), and the spray nozzle and the monitoring optics A thermal spraying apparatus in which the system head and the lighting device are opposed to the other wall surface and the distance between the tip of the thermal spray nozzle and the furnace wall is set to 40 mm to 47.5 mm by the other distance meter of the laser rangefinder so that the wall surface can be sprayed. A furnace wall repair device characterized by being.

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