JP6760650B2 - Lance nozzle attachment - Google Patents

Description

The present invention relates to a lance nozzle attachment that sprays a sprayed material onto a furnace wall when repairing a coke oven.

When repairing a coke oven, the lance that sprays the spray material onto the furnace wall is a main body pipe that is several meters long and a material injection nozzle that protrudes from the vicinity of the tip of the main body pipe in a specific direction (the extending orthogonal direction of the main body pipe). It is composed of (Patent Document 1). The main body pipe penetrates from the base end to the tip, but the tip is closed and only the material injection nozzle is open (the side inserted into the coke oven is called the tip, and the front side is called the base end. .same as below). The sprayed material is sent together with the reaction gas (for example, oxygen) from the supply hose connected to the base end, is pressure-fed toward the tip, and is blown out integrally with the reaction gas from the material injection nozzle toward the furnace wall. Since the furnace wall to be repaired has a high temperature, the thermal spray material and the reaction gas react on the surface of the high temperature furnace wall to form a new refractory layer on the furnace wall.

The nozzle attachment has a structure in which a pipe-shaped material injection nozzle is projected from a hollow attachment main body that closes the tip and communicates the rear end with the main body pipe, and a tapered male thread portion is formed on the outer peripheral surface of the base end of the attachment main body. ing. The nozzle attachment is often configured such that the material injection nozzle is orthogonal to the extending direction of the main body pipe and protrudes from the attachment main body, but the material injection nozzle is obliquely intersected with the extending direction of the main body pipe and is projected from the attachment main body. Some are configured. The tapered male thread portion ensures airtightness without being completely tightened to the attachment connection portion of the main body pipe. Since the lance disclosed in Patent Document 1 requires the air injection nozzle that lifts the tip of the lance to be directed downward, the direction of the material injection nozzle is changed by adjusting the screwing amount of the tapered male screw portion (Patent). Document 1 · [0023]).

Japanese Unexamined Patent Publication No. 2012-012535

Since the sprayed material passes through the nozzle attachment while colliding with the inner surface, the attachment main body and the material injection nozzle are gradually worn from the inner peripheral surface to reduce the wall thickness. When the wall thickness of the attachment body and the material injection nozzle becomes thin in this way, the reaction gas and the sprayed material decrease the flow velocity and diffuse and inject. The decrease in the flow velocity allows the reaction region of the reaction gas and the sprayed material to approach the material injection nozzle, and makes it easy to cause ignition in the vicinity of the material injection nozzle = tip ignition. Tip ignition is one of the causes of backfire. Further, the diffusion of the reaction gas and the sprayed material makes the reaction of the reaction gas and the sprayed material sprayed on the furnace wall insufficient, and the adhesion of the formed sprayed material to the furnace wall is insufficient, or the structural strength of the sprayed material is insufficient. To lower. For these reasons, it is recommended that the nozzle attachment be replaced when the wall thickness of the attachment body and the material injection nozzle becomes thin.

However, in the nozzle attachment, since the wall thickness of the attachment body and the material injection nozzle becomes thinner from the inner peripheral surface, it cannot be confirmed from the outside that the wall thickness becomes thinner. Therefore, an operation guideline for appropriately removing the nozzle attachment from the lance body and visually checking the change in the wall thickness of the attachment body or the material injection nozzle is also shown. However, since it is troublesome to attach / detach the nozzle attachment to the lance body, the check is not actually performed so much. In addition, it is unclear how thin the thickness of the attachment body and the material injection nozzle should be for replacement, and the judgment of replacement differs depending on the operator.

For these reasons, it was not possible to avoid the occurrence of tip ignition or backfire and deterioration of the physical properties of the sprayed body due to the thinning of the wall thickness of the attachment body and the material injection nozzle. In particular, a backfire is extremely dangerous to the operator, and even if the operator is not damaged, the lance and the thermal spraying device may be damaged. In addition, since it takes time to restart the repair work after the backfire, there is a problem that the work efficiency of the repair work of the coke oven is lowered. Therefore, for the purpose of suppressing or preventing the occurrence of tip ignition or backfire due to the thinning of the wall thickness of the attachment body and the material injection nozzle and the deterioration of the physical properties of the sprayed body, without being influenced by the operator. We examined it to provide a nozzle attachment that can objectively grasp the replacement time.

The one developed as a result of the examination is a hollow attachment body that closes the tip and communicates the rear end with the main body pipe of the lance. It is a nozzle attachment of a lance characterized by forming a thin portion having a thin wall thickness inward in the radial direction from the outer peripheral surfaces of one or both. As for the nozzle attachment, both the attachment body and the material injection nozzle are thinned from the inner peripheral surface. Therefore, when the attachment main body and the material injection nozzle reduce the wall thickness to a certain extent, the thin wall portion first opens. As a result, the attachment body and the material injection nozzle are recognized by the opening of the thin portion as being thinned to a certain extent.

The thin portion does not limit the contour shape appearing on the outer peripheral surface of the attachment body or the material injection nozzle, or the radial cross-sectional shape of the attachment body or the material injection nozzle. However, the thin-walled portion formed in the material injection nozzle preferably has a configuration in which the contour shape appearing on the outer peripheral surface of the material injection nozzle does not reach the injection port. When the injection port collides with the furnace wall, the thin part where the contour shape appearing on the outer peripheral surface of the material injection nozzle reaches the injection port is crushed and blocked, or the furnace wall or the sprayed body is clogged, and the wall thickness of the material injection nozzle is increased. There is a risk that it will not open even if it becomes thin. Since the thin part where the contour shape appearing on the outer peripheral surface of the material injection nozzle does not reach the injection port is surrounded, even if the injection port collides with the furnace wall, it is difficult to collapse and the furnace wall or the sprayed body may be clogged. There are few. In this way, the thin portion whose contour shape appearing on the outer peripheral surface of the material injection nozzle does not reach the injection port is surely opened when the wall thickness of the material injection nozzle becomes thin.

The nozzle attachment of the present invention recognizes that the wall thickness of the material injection nozzle has become thin to a certain extent by the opening of the thin-walled portion. Here, if the thin-walled portion is set so that it opens when the wall thickness of the material injection nozzle becomes thin enough to require replacement of the nozzle attachment, it is time to replace the nozzle attachment by visually recognizing the opening of the thin-walled portion. Can be judged. The thin portion can be provided at an arbitrary depth with respect to the wall thickness of the attachment main body or the material injection nozzle, and the replacement time can be freely set. Further, since the opening of the thin-walled portion can be visually recognized without removing the nozzle attachment from the main body pipe of the lance, anyone can judge that it is time to replace the nozzle attachment.

The thin-walled portion where the contour shape appearing on the outer peripheral surface of the material injection nozzle does not reach the injection port is less likely to be crushed even if the injection port collides with the furnace wall, and there is less risk of clogging of the furnace wall or the sprayed body. If the wall thickness becomes thin, it will surely open. This makes it possible for anyone to reliably determine that it is time to replace the nozzle attachment. If the contour shape of the reaction gas and the sprayed material is small on the outer peripheral surface of the attachment body or the material injection nozzle, the reaction gas and the sprayed material will not be ejected from the open thin-walled portion, and the flow velocity of the reaction gas will not decrease or diffuse. As described above, the present invention is excellent in that the replacement time of the nozzle attachment can be easily and surely determined from the outside without causing a decrease in the flow velocity or diffusion of the reaction gas.

It is a perspective view which shows an example of the lance to which the nozzle attachment of this invention is applied. It is an enlarged perspective view which shows the nozzle attachment of this example which provided the thin-walled part. In the material injection nozzle of this example, it is an enlarged view corresponding to the arrow A portion in FIG. 2 in which the vicinity of the thin wall portion before the opening is broken. In the material injection nozzle of this example, it is an enlarged view corresponding to the arrow-viewing portion A in FIG. 2 showing the vicinity of the thin-walled portion after opening. In the material injection nozzle of this example, it is an enlarged view corresponding to the arrow A portion in FIG. 2 in which the vicinity of the thin-walled portion after opening is broken. It is an enlarged view corresponding to the arrow view part A in FIG. 2 which shows the material injection nozzle of another example 1 in which three thin-walled parts are arranged side by side in the circumferential direction. FIG. 5 is an enlarged view corresponding to the arrow A portion in FIG. 2 in which the vicinity of the thin-walled portion before the opening is broken in the material injection nozzle of the first embodiment. It is an enlarged view corresponding to the arrow view part A in FIG. 2 which shows the state in which the thinnest part of the material injection nozzle of another example 1 is opened. FIG. 5 is an enlarged view corresponding to the arrow-viewing portion A in FIG. 2, showing a state in which the second thinnest wall portion is opened in the material injection nozzle of the first embodiment. It is an enlarged view corresponding to the arrow view part A in FIG. 2 showing the material injection nozzle of another example 2 in which three thin-walled portions are arranged side by side in the extending direction of the material injection nozzle. It is an enlarged view corresponding to the arrow view part A in FIG. 2 which shows the material injection nozzle of another example 3 provided with the thin-walled part which has the inclined bottom surface in the circumferential direction. It is an enlarged view corresponding to the arrow-viewing portion A in FIG. 2 in which the vicinity of the thin-walled portion before the opening is broken in the material injection nozzle of the third embodiment. FIG. 5 is an enlarged view corresponding to the arrow-viewing portion A in FIG. 2, showing a state in which a portion of a thin inclined bottom surface is opened in the material injection nozzle of the third embodiment. FIG. 5 is an enlarged view corresponding to the arrow-viewing portion A in FIG. 2, showing a state in which a portion of an open inclined bottom surface is enlarged in the material injection nozzle of the third embodiment. It is an enlarged view corresponding to the arrow view part A in FIG. 2 which shows the material injection nozzle of another example 4 which provided the thin-walled part which has the inclined bottom surface in the extending direction of a material injection nozzle.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As seen in FIG. 1, the nozzle attachment 2 of the present invention is attached to the tip of the pipe body 11 constituting the lance 1 as in the conventional case. As seen in FIG. 2, the nozzle attachment 2 of this example has a pipe-shaped material injection nozzle 22 projecting in an orthogonal relationship from a hollow attachment main body 21 that closes the tip and communicates the rear end with the main body pipe 11. ing. The nozzle attachment 2 and the pipe body 11 are connected, for example, by screwing a male screw provided on the outer peripheral side of the attachment body 21 into a female screw provided on the inner peripheral side of the pipe body 11.

The nozzle attachment 2 of this example is an example in which a thin portion 3 having a thin wall thickness inward in the radial direction is formed from the outer peripheral surface of the material injection nozzle 22. The thin portion may be formed on the outer peripheral surface of the attachment main body 21, or may be formed on the outer peripheral surfaces of both the attachment main body 21 and the material injection nozzle 22. Since the thin-walled portion formed on the outer peripheral surface of the attachment main body 21 is the same as the thin-walled portion 3 formed on the outer peripheral surface of the material injection nozzle 22, description thereof will be omitted. The thin-walled portions formed on both the attachment body 21 and the material injection nozzle 22 can be opened at different depths at different times.

As seen in FIGS. 2 and 3, the thin portion 3 of this example has a circular contour shape that does not reach the injection port 221 on the outer peripheral surface of the material injection nozzle 22, and has the same bottom surface 31 as the contour shape. The depth th of the thin portion 3 can be freely set within the range of the wall thickness tn of the material injection nozzle 22. The timing of the opening of the thin portion 3 is set by the residual thickness tr of the material injection nozzle 22 (= the wall thickness tn of the material injection nozzle 22 − the depth th of the thin wall portion 3). The thin portion 3 having a deep depth th is opened quickly because the residual thickness tr of the material injection nozzle 22 is thinned. On the contrary, the thin portion 3 having a shallow depth th increases the residual thickness tr of the material injection nozzle 22, thus delaying the opening.

As the repair work proceeds, the material injection nozzle 22 becomes an injection port 222 whose diameter is expanded from the original injection port 221 by being worn from the inner peripheral surface by the injected reaction gas and the sprayed material to reduce the wall thickness tn. .. As a result, as can be seen in FIGS. 4 and 5, the thin-walled portion 3 is opened without the bottom surface 31 (comparative control of FIGS. 3 and 5). In a normal case, the time when the thin portion 3 is opened is the time when the nozzle attachment 2 is replaced. In reality, it may not be necessary to replace the nozzle attachment 2 immediately after the thin portion 3 is opened. In such a case, the nozzle attachment 2 may be replaced within a certain period from the opening of the thin portion 3.

As in this example, when there is only one thin-walled portion 3, the replacement time of the nozzle attachment 2 can be set only by selecting whether or not the thin-walled portion 3 opens. As seen in FIGS. 6 and 7, when three thin-walled portions 4a, 4b, and 4c having different depths are provided side by side in the circumferential direction, the material injection nozzle 22 of the first embodiment has different opening timings. , The replacement time of the nozzle attachment 2 can be changed depending on the number of openings. In this case, it is important that the thin-walled portions having different depths have different depths, and the contour shape appearing on the outer peripheral surface of the material injection nozzle 22 may be different. Further, the number of thin-walled portions having different depths may be two or four or more.

In another example 1, the thin-walled portion 4a is the shallowest, the thin-walled portion 4c is the deepest, and the thin-walled portion 4b is an intermediate depth between the two. As the repair work proceeds, the material injection nozzle 22 wears from the inner peripheral surface and becomes an injection port 222 having an enlarged diameter from the original injection port 221. As a result, as seen in FIG. 8, the bottom surface 41c of the deepest thin-walled portion 4c disappears and opens, but the bottom surfaces 41b and 41c of the remaining thin-walled portions 4a and 4b still exist and do not open. This means that the degree of wear of the material injection nozzle 22 is still low. When the coke oven to be repaired has a high temperature, even if the diffusion of the reaction gas and the sprayed material is not remarkable, there is a risk of causing tip ignition or backfire. Is preferable.

If the repair work is further advanced without replacing the nozzle attachment 2, the material injection nozzle 22 is further worn from the inner peripheral surface, and becomes an injection port 223 having a further enlarged diameter. As a result, as seen in FIG. 9, the thin portion 4c is opened to the thin portion 4b having an intermediate depth, but the shallowest thin portion 4a is not opened yet. When the time when the thin-walled portion 4b opens is set as the replacement time of the nozzle attachment 2, the opening of the thin-walled portion 4c has a meaning of calling attention to the replacement time, for example, after the thin-walled portion 4c opens, be careful. It is advisable to have the nozzle attachment 2 used and replace the nozzle attachment 2 when the thin portion 4b opens.

The nozzle attachment 2 may continue to be used even if the thin portion 4b is opened at the discretion of the site or the like. However, although not shown, if the shallowest thin-walled portion 4a is opened, the possibility of tip ignition or backfire becomes very high, so it is better to replace the nozzle attachment 2. When a plurality of thin-walled portions having different depths are formed in this way, the replacement time of the nozzle attachment 2 can be set according to the number of opened thin-walled portions. This means that the replacement time of the nozzle attachment 2 can be appropriately changed by the judgment of the site, and the effect of giving a degree of freedom to the replacement time of the nozzle attachment 2 is obtained.

As seen in FIG. 10, the material injection nozzle 22 of another example 2 is an example in which thin-walled portions 4a, 4b, and 4c having different depths are arranged side by side in the extending direction of the material injection nozzle 2. In the nozzle attachment 2 of another example 2, the bottom surface 41c is scraped from the deep thin portion 4c depending on the degree of wear of the material injection nozzle 22, and the bottom surface 41c is opened in order. Therefore, according to the number of the opened thin portion, the nozzle attachment 2 You can set the replacement time. The thin portions 4a, 4b, and 4c may not be aligned in the circumferential direction or the extending direction of the material injection nozzle 22, and may be formed at arbitrary positions as long as there is no large bias in the degree of wear. ..

As seen in FIGS. 11 and 12, the thin portion 5 of the third embodiment is a long groove extending in the circumferential direction of the material injection nozzle 22, and is inclined gradually and deeply in one direction in the circumferential direction. It has a bottom surface 51. Although the inclined bottom surface 51 has a curved cross section, it is expressed as "inclined" for convenience because it is oblique with respect to the circumference. As a result, when the material injection nozzle 22 wears, the inclined bottom surface 51 is scraped and opens, but the opening area gradually increases according to the degree of wear. Therefore, the replacement time of the nozzle attachment 2 is determined from the size of the opening area. Can be changed. In this case, it is important that the depth of the thin-walled portion having an inclined bottom surface changes gradually, and the extending direction is not straight, for example, meandering or skewing with respect to the circumferential direction. May be good.

In another example 3, the portion of the inclined bottom surface 51 on the upper surface side (right side in FIGS. 11 and 12) is the shallowest, and the portion of the inclined bottom surface 51 on the side surface side (left side in FIGS. 11 and 12) is the deepest. As the repair work proceeds, the material injection nozzle 22 wears from the inner peripheral surface and becomes an injection port 222 having an enlarged diameter from the original injection port 221. As a result, as seen in FIG. 13, the deepest inclined bottom surface 51 is eliminated and slightly opened. The small opening area of the inclined bottom surface 51 means that the degree of wear of the material injection nozzle 22 is still low. When the coke oven to be repaired has a high temperature, it is preferable to replace the nozzle attachment 2 if the thin-walled portion 5 opens.

If the repair work is further advanced without replacing the nozzle attachment 2, the material injection nozzle 22 is further worn from the inner peripheral surface, and becomes an injection port 223 having a further enlarged diameter. As a result, as seen in FIG. 14, the thin-walled portion 5 opens to the vicinity of the middle of the inclined bottom surface 51, but still leaves a portion that does not open. When the time when the nozzle attachment 2 is opened is set to the time when the nozzle attachment 2 is opened to the middle of the inclined bottom surface 51, the first opening of the thin-walled portion 5 has a meaning of calling attention to the replacement time. For example, a part of the inclined bottom surface 51 is opened. After that, it is advisable to have the nozzle attachment 2 used with caution, and to have the nozzle attachment 2 replaced when the inclined bottom surface 51 opens to near the middle.

The nozzle attachment 2 may be continued to be used even if the nozzle attachment 2 is opened to the vicinity of the middle of the inclined bottom surface 51 at the discretion of the site or the like. However, although not shown, if the opening is made to the shallowest portion of the inclined bottom surface 51, the possibility of tip ignition or backfire becomes very high, so it is better to replace the nozzle attachment 2. By forming the thin-walled portion having the inclined bottom surface in this way, the replacement time of the nozzle attachment 2 can be finely set according to the opening surface of the inclined bottom surface. This means that the replacement time of the nozzle attachment 2 can be flexibly changed by the judgment of the site, and the effect of increasing the degree of freedom in the replacement time of the nozzle attachment 2 is obtained.

As seen in FIG. 15, the material injection nozzle 22 of another example 4 is an example in which a thin-walled portion 5 having an inclined bottom surface 51 extending in the extending direction of the material injection nozzle 2 is formed. In the fourth example, unlike the third example, it is not necessary to bend the inclined bottom surface 51 which does not extend in the circumferential direction in the extending direction. However, the inclined bottom surface 51 is an arc cross section whose extending orthogonal cross section is coaxial with the central axis of the material injection nozzle 22 so that the residual thickness with respect to the inner peripheral surface of the material injection nozzle 22 becomes equal in the circumferential direction. Also in the nozzle attachment 2 of the fourth embodiment, the opening area of the inclined bottom surface 51 changes depending on the degree of wear of the material injection nozzle 22, and the replacement time of the nozzle attachment 2 can be set according to the opening area. The extending direction of the inclined bottom surface 51 is free, but the extending direction of the material injection nozzle 22 of the alternative example 3 and the extension direction of the material injection nozzle 22 of the alternative example 4 so that the residual thickness with respect to the inner peripheral surface of the material injection nozzle 22 is not biased. It is preferable to align them in the direction.

1 lance
11 Pipe body 2 Nozzle attachment
21 Attachment body
22 Material injection nozzle
221 Injection port
222 injection port
223 Injection port 3 Thin wall part
31 Bottom 4a Thin wall
41a Bottom 4b Thin wall
41b Bottom 4c Thin wall
41c Bottom 5 Thin wall
51 Inclined bottom
tn Material injection nozzle wall thickness
th Thin-walled depth
tr Residual thickness of material injection nozzle

Claims (2)

Hollow attachment that closes the tip and connects the rear end to the main body pipe of the lance In the nozzle attachment of the lance in which a pipe-shaped material injection nozzle protrudes from the main body.
A lance nozzle attachment characterized in that a thin portion having a thin wall thickness is formed inward in the radial direction from the outer peripheral surfaces of one or both of the attachment main body and the material injection nozzle. The nozzle attachment of the lance according to claim 1, wherein the thin portion formed in the material injection nozzle has a contour shape that appears on the outer peripheral surface of the material injection nozzle and does not reach the injection port.

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