JP2006063275A - Method for repairing oven wall of coke oven carbonization chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate operation for carrying out thermal spraying and shorten repairing time in thermal spraying by dividing the damaged part of oven wall of a coke oven carbonization chamber into a plurality of layers and improve workability by making preparation of moving speed patterns of a thermal spraying nozzle which are separately different in divided each layer unnecessary. <P>SOLUTION: In the method for carrying out thermal spraying repair by dividing the damaged part of oven wall of a coke oven carbonization chamber into a plurality of layers in damaged depth direction and successively blowing a thermal spraying material from the lower layer, thermal spraying layer thickness of the divided each layer is determined according to damaged depth of the oven wall damaged part and the each layer is constituted to continue from one end side of the oven wall damaged part to other end and further, layer numbers for dividing the damaged part of the oven wall in the depth direction are determined according to depth of the deepest part of damaged part of the oven wall and layer thickness of each layer is determined so that the moving speed patterns of the thermal spraying nozzle in the divided each layer are equivalent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for spraying and repairing a carbonization chamber furnace wall of a coke oven.

  The furnace wall of the coking chamber in the coke oven is composed of refractory bricks (hereinafter simply referred to as refractory). If this refractory is damaged, for example, by joints, cracks, or defects, the coke oven gas generated will flow from the carbonization chamber into the combustion chamber and cause incomplete combustion, or adhesion of pyrolytic carbon to the furnace wall There is a problem of clogging due to an increase in the amount of cracking or the clogging of the carbonized coke into the damaged part of the furnace wall (hereinafter simply referred to as the damaged part). For this reason, a method of spraying repairing by spraying a sprayed material on the damaged part of the furnace wall has been conventionally performed.

As an example, Patent Document 1 discloses that when repairing a damaged part of a furnace wall in a carbonization chamber by thermal spraying, if the damaged part has a deep damage depth, the damaged part is divided into a plurality of layers, A method of performing thermal spray repair and refilling is described.
JP 7-126635 A

  However, in the above method, for example, as shown in FIG. 4, when there is a large uneven portion inside the damaged portion 2 of the furnace wall 3, in the range from one end Y to the other end Z of the damaged portion 2. When repairing by spraying the spray material with the spray nozzle 1 by dividing into three layers in the depth direction of the damaged portion 2, first the positions 11 to 13 of the lowermost layer are sprayed first, and then the position 14 of the upper layer is sprayed. , 15 are sprayed, and finally the uppermost layer position 16 is sprayed.

When moving from 11 to 12, 12 to 13, or 14 to 15 in these positions 11 to 16, the spraying material spraying from the spray nozzle 1 is always interrupted to the next position (12, 13, 15). The spraying nozzle 1 must be set at the spraying start point, and spraying of the sprayed material must be started again. This involves a complicated operation and the time required for repairing the spraying is increased and the furnace wall of the carbonization chamber is cooled. As a result, spalling may occur and damage the refractory in a healthy place.
Moreover, since the moving speed pattern of the thermal spray nozzle 1 has to be created according to the divided depths of the respective positions 11 to 16, the workability is not preferable. Reference numeral 5 denotes a finished surface.

  In the present invention, when spraying the damaged part into a plurality of layers, the thermal spraying is continuously repaired along the unevenness in the damaged part, thereby suppressing the interruption of the thermal spraying and facilitating the thermal spraying work. It is an object of the present invention to shorten the length and to further improve the workability by making it unnecessary to create different spray nozzle moving speed patterns for each of the divided layers.

The present invention has been made to solve the above-described problems, and has the following configuration.
(1) In the method of performing spraying repair by spraying spraying material sequentially from the lower layer in the damage depth direction of the damaged part of the furnace wall in the coke oven carbonization chamber, the sprayed layer thickness of each of the divided layers is A method of repairing a furnace wall in a coke oven carbonization chamber, which is determined according to a damage depth of the furnace wall damaged part, and wherein each layer is continued from one end side to the other end side of the furnace wall damaged part.
(2) The coke oven carbonization chamber according to (1), wherein the number of layers dividing the furnace wall damaged part in the depth direction is determined according to the depth of the deepest part of the furnace wall damaged part. Furnace wall repair method.
(3) The coke oven carbonization chamber furnace according to (1) or (2), wherein the layer thickness of each layer is determined so that the moving velocity patterns of the spray nozzles in each of the divided layers are equal. Wall repair method.
(4) The thickness of each of the divided layers is determined in consideration of the amount of rebound loss that occurs during thermal spraying. The coke oven carbonization chamber according to any one of (1) to (3), Furnace wall repair method.
(5) The furnace wall repair method for a coke oven carbonization chamber according to any one of (1) to (4), wherein a moving speed of the thermal spray nozzle is in a range of 10 to 60 mm / S.

  According to the present invention, even if there is unevenness in the furnace wall damaged part, since each segmented layer is continuous from at least one end side to the other end side, it becomes possible to continuously spray spray repair with a spray nozzle, Thermal spray repair time can be shortened, cooling of the carbonization chamber furnace wall at the time of repair can be suppressed, and damage to the refractory in a healthy place can be prevented. Furthermore, by determining the layer thickness of each layer so that the movement speed patterns of the spray nozzles in each of the divided layers are equal, it is not necessary to create a movement speed pattern of the spray nozzles for each layer. It can be further improved.

The furnace wall repair method for a carbonization chamber according to an embodiment of the present invention is a damaged part generated in a refractory constituting the furnace wall of the carbonization chamber, in particular, a damaged part 2 having large irregularities inside as shown in FIG. Is continuously repaired by thermal spraying.
In order to efficiently complete the repair up to the position of the finished surface 5 when the damaged portion 2 is divided into a plurality of layers and repaired by thermal spraying, the positions 11 to 12 and 12 in FIG. When moving from 13, 14 to 15, spraying of the spray material from the spray nozzle 1 is interrupted, and the spray nozzle 1 is set at the spray start point of the next position (12, 13, 15) and spraying is performed again. Instead of starting, it is necessary to start spraying at least 11 (or 14) and not stop until 13 (or 15) is over. Also, it is preferable to start the spraying at 11 and not stop the spraying until the end of 16.

  As a result of various experiments and examinations by the present inventors to achieve the object, as shown in FIG. 1, in accordance with the internal irregularities in the range from one end Y to the other end Z of the damaged portion 2 of the furnace wall 3. That is, the sprayed layer thickness per layer is adjusted in accordance with the damage depth (if the damage depth is deep, one layer is thickened, and if the damage depth is shallow, one layer is sprayed) It was found that the thermal spraying repair can be continuously performed on each layer from at least one end Y to the other end Z, and the finished surface 5 can also be flattened. .

The number of layers to be divided is preferably determined according to the depth of the deepest portion of the repair target region. That is, to increase the thickness of the thermal spray layer, the moving speed of the thermal spray nozzle can be reduced, and to reduce the thickness of the thermal spray layer, the speed of movement of the thermal spray nozzle can be increased (the supply amount of the thermal spray material is constant).
However, when spraying over a wide area, as shown in FIG. 2, the spraying nozzle movement trajectory 4 is straight and zigzag, so if the spraying nozzle 1 moves too slowly, the spraying sprayed on the repair surface. The spread of the material (the width W of the bottom of the thermal spray material N adhering in a mountain shape as shown in FIG. 5 by spraying) becomes extremely wide, and the bottoms overlap each other, so that a smooth finished surface 5 cannot be obtained. For this reason, the number of layers should be determined based on the depth of the deepest part of the repair target region so that the sprayed layer thickness obtained at a moving speed within a range that does not adversely affect the flatness of the finished surface 5 can be secured. Is preferred.
In addition, when a thermal spray material is sprayed, a phenomenon occurs in which the thermal spray material scatters without adhering to the repair surface (reband loss). If the reband loss amount differs depending on the spray distance, Determine the number.

Furthermore, in order to simplify the workability of determining the moving speed pattern, the layer thickness is set so that the moving speed pattern of the thermal spray nozzle is equal in each layer. That is, the size of the damaged portion varies depending on the damage state, but if it is large, it is about 1 m ² , and the spray nozzle movement locus 4 is a zigzag pattern as shown in FIG. Therefore, the total extension of the moving distance of the thermal spray nozzle per layer may reach 50 to 70 m. Furthermore, as described above, the damage depth varies, and the movement of the thermal spray nozzle must be adjusted accordingly.
For these reasons, it is preferable not to set the movement speed pattern of the thermal spray nozzle for each layer but to make the speed setting workability good by making the same movement speed pattern for each layer.

  For that purpose, if the same sprayed layer thickness is obtained even if the spraying distance is different, as in the case of rubber spraying (spraying method in which the sprayed material is melted and sprayed onto the repaired surface), depending on the damage depth of the damaged part Thus, each layer may have the same layer thickness pattern so that each layer has the same layer thickness.

On the other hand, as in the case of thermite spraying (spraying using thermite reaction), the reband loss amount of the sprayed material differs depending on the spraying distance, and the thickness of the sprayed layer formed by one spraying, that is, as shown in FIG. In addition, as the spraying distance becomes longer, the reband loss amount increases, and when the formed sprayed layer thickness becomes thinner, the layer thicknesses of the respective layers A to D are determined in consideration of the reband loss amount resulting from the spraying distance. Specifically, the depth H _M of the deepest portion of the damage portion 2, the allowable minimum movement speed Vmin of the spray nozzle 1, the spraying ability of the spray nozzle 1 Q, Ribandorosu determined based on the spraying distance as shown in FIG. 3 The sprayed thickness Ta of the lowermost layer A is obtained based on the amount.

Next, a thermal spray thickness Tb of the second layer B, which, from that spray distance is in spraying thickness Ta content short of the bottom layer A, corresponding to the shortened thermal spray distance (H _M -Ta) The amount of reband loss to be obtained is obtained, and the layer thickness of the second layer B is obtained from the obtained reband loss amount in the same manner as the lowermost layer A. In this way, the layer thicknesses Tc, Td,... Are sequentially obtained by changing the reband loss amount in accordance with the spraying distance that is sequentially shortened.

Then, until the sum of the thicknesses of up lowermost A~ uppermost D (Ta + Tb + Tc + Td) is equal to the depth H _M of the deepest portion, and assimilation repeatedly while changing the moving speed V of the spray nozzle 1, the number of layers ( 4 layers) and the thicknesses Ta to Td of the respective layers are determined.
At positions other than the deepest portion, the layer thickness of each layer is obtained in the same manner as described above based on the number of layers. The pitch of each position to be obtained is preferably a distance within a range in which the damage depth changes by 5 to 20 mm (more preferably 10 to 15 mm).

  The thermal spray material sprayed by the thermal spray nozzle 1 rises in a mountain shape as shown in FIG. 5 on the thermal spray surface, but when the moving speed of the thermal spray nozzle 1 is less than 10 mm / S, the base is higher than the rise height R. If the width W of the skirt is extremely wide, and conversely exceeds 60 mm / S, the spraying speed is too high and the width W of the skirt becomes extremely narrow. Therefore, the difference in the width W of the skirt is not so large. In the range of ˜60 mm / S, it is preferable to adjust the moving speed of the thermal spray nozzle 1 according to the damage depth.

  2 starts from E on the lower side of the drawing, sprays in a zigzag upward direction on the solid line in the direction of the arrow, and reaches F at the upper end of the drawing via F between the solid lines. Spray on the dotted line in the direction of the arrow in a zigzag direction toward J on the lower side of the drawing, and when reaching J further, spray on the solid line again in the direction opposite to the arrow on the solid line again via K, It is preferable that the repair is completed by repeating this process continuously from the lowermost layer A to the uppermost layer D without interrupting the thermal spraying.

An embodiment of the present invention will be described with reference to FIGS.
In this example, a thermite spray material having the components shown in Table 1 was sprayed from the final spray finish surface 5 (health furnace wall surface level) using a spray nozzle 1 having a spraying capacity of 40 kg / hour. The damaged part 2 of the furnace wall 3 of the coke oven carbonization chamber is repaired while moving away by a distance H _O (80 mm in this example).

First, a laser distance meter was inserted into the carbonization chamber to be repaired, the furnace wall damaged part 2 was measured with the laser distance meter, the measured value was processed, and a contour line as shown in FIG. 2 was used. Obtain a dimensional coordinate diagram. Then, reading the depth H _M damage depth and the deepest portion of each coordinate position of the damaged portion 2 from the three-dimensional coordinate diagram (in this case 40 mm).

Next, the number of sprayed layers to be divided and the thickness of each layer are determined.
This is determined by the damage depth, the allowable minimum moving speed Vmin of the thermal spray nozzle 1, the thermal spraying capability Q of the thermal spray nozzle 1, and the reband loss amount corresponding to the thermal spray distance _HO as shown in FIG.
First, in the lowermost layer A, since the spray distance H _O is 120 mm (= 80 mm + 40 mm), the reband loss amount is obtained based on this, and the reband loss amount and the allowable minimum moving speed of the spray nozzle 1 (in this example, 20 mm). / S), the layer thickness Ta of the lowermost layer A is determined based on the spraying capability (40 kg / hour) of the spray nozzle 1.

  Further, the layer thickness Tb of the layer B thereon is determined. This is because the spraying distance is shortened by the thickness Ta of the lowermost layer A (120 mm−lowermost layer thickness Ta), and the reband loss amount corresponding to this spraying distance is obtained to determine the thickness Tb of the layer B in the same manner as described above. . In this way, the thicknesses Tc and Td of the layers C and D thereon are sequentially determined. This is performed until the sum of the thicknesses of the respective layers reaches 40 mm or more (here, four layers).

  If the sum of thicknesses from the lowermost layer A to the uppermost layer (Ta + Tb + Tc + Td) is 40 mm, the number of layers is as it is, and the layer thicknesses of Ta, Tb, Tc, and Td are 40 mm. If not, change the moving speed of the thermal spray nozzle 1 until the sum of the thicknesses of each layer reaches 40 mm (by making it faster than the allowable minimum moving speed), and repeatedly simulate the thickness, number of layers, and thermal spraying. The moving speed of the nozzle 1 is determined.

Next, the layer thickness at a place other than the deepest part is determined. That is, the thickness of each of the divided four layers and the moving speed of the thermal spray nozzle 1 are determined based on the damage depth at a place other than the deepest portion, the number of layers, and the amount of reband loss.
That is, based on the moving speed of the thermal spray nozzle 1 obtained at the deepest part, the moving speed is sequentially increased, and repeatedly simulated until the sum of the sprayed thicknesses of the four layers reaches the depth of the position, The thickness of each layer and the moving speed of the spray nozzle 1 are determined.

  In addition, the space | interval which calculates | requires the layer thickness in the places other than the deepest part and the moving speed of the thermal spray nozzle 1 was made into the distance whenever the damage depth changed 15 mm. That is, the damage depth is 15 mm or less in the range of the speed X1 in FIG. 1, the damage depth is in the range of 15 mm to 30 mm, and the damage depth is in the range of the speed X3 is more than 30 mm.

The results obtained in this way are shown in Table 2.
As can be seen from Table 2, the number of layers is 4 (A to D), the layer thickness is 6 mm for the A layer, 8 mm for the B layer, 11 mm for the C layer, and 14 mm for the D layer. It was able to be divided into continuous layers to the end side. The four layers of spray nozzles 1 were sprayed at a moving speed X1 to X3 of X1 = 40 mm / s, X2 = 30 mm / s, and X3 = 15 mm / s, respectively.
As a result, the unevenness of the final finished surface 5 is ± 5 mm, and the step with the sound furnace wall surface is 0-10 mm, and a good repaired finished surface can be obtained, and the spraying operation is completed in 0.75 hours, and the carbonization chamber The decrease in the furnace wall temperature was also suppressed.

It is a figure which shows the repair state in the damaged part which concerns on one embodiment of this invention, and is arrow sectional drawing of FIG. The top view which showed the movement locus | trajectory of the thermal spray nozzle at the time of repairing the damaged part while showing the damage depth of a damaged part using a contour line. The figure which shows the relationship between a thermal spray distance and a rebound loss ratio. The figure which shows the conventional spraying repair order. The figure which shows the adhesion state to the repair surface of the thermal spraying material sprayed.

Explanation of symbols

1: Thermal spray nozzle 2: Damaged part 3: Furnace wall 4: Trajectory of thermal spray nozzle 1 5: Thermal spray finish
11-16: spraying position to D: sprayed layer E to G, J, K: thermal spray trajectory H: distance of the spray nozzle and the lesion H _M: deepest depth H _O lesion: spraying distance N: spray material R: Swelling height of sprayed material W: Width of bottom of sprayed material Ta-Td: Sprayed thickness X1-X3, Xn: Spray nozzle moving speed Y: One end of damaged part Z: Other end of damaged part

Claims (5)

In the method of performing spraying repair by spraying sprayed material sequentially from the lower layer in the damage depth direction of the damaged part of the furnace wall of the coke oven carbonization chamber, the sprayed wall thickness of each of the divided layers is the furnace wall A method for repairing a furnace wall in a coke oven carbonization chamber, wherein the layer is determined in accordance with a damage depth of the damaged part, and each layer is continued from one end side to the other end side of the furnace wall damaged part. 2. The method of repairing a coke oven coking chamber furnace wall according to claim 1, wherein the number of layers dividing the furnace wall damaged portion in the depth direction is determined according to the depth of the deepest portion of the furnace wall damaged portion. . 3. The method of repairing a furnace wall in a coke oven carbonization chamber according to claim 1 or 2, wherein the layer thickness of each layer is determined so that the moving velocity patterns of the spray nozzles in each of the divided layers are equal. The method for repairing a furnace wall in a coke oven carbonization chamber according to any one of claims 1 to 3, wherein the thickness of each of the divided layers is determined in consideration of the amount of rebound loss that occurs during spraying. The method for repairing a furnace wall in a coke oven carbonization chamber according to any one of claims 1 to 4, wherein a moving speed of the thermal spray nozzle is in a range of 10 to 60 mm / S.

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