JP2012012535A - Lance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability of a lance accompanying an increase in weight in no small way by providing an air cooling means as a cooling means.SOLUTION: The lance 1 sprays a thermal spray material on a furnace wall when a coke oven is repaired. The lance has a double tube structure where a protective pipe 13 is externally filled to a body pipe 11 press-feeding a thermal spray material TSM with oxygen O. The tip of the protective pipe 13 is closed, and an air jet nozzle 131 jetting compressed air Air fed to a gap between the body pipe 11 and the protective pipe 13 is projected from the side face in the vicinity of the closed tip to the extending orthogonal direction of the protective pipe 13.

Description

  The present invention relates to a lance for spraying a spray material onto a furnace wall when repairing a coke oven.

  The lance that sprays the sprayed material onto the furnace wall when repairing the coke oven is a main pipe that is several meters long and a material that protrudes from the vicinity of the tip of the main pipe in a specific direction (usually the orthogonal direction in which the main pipe extends). And an injection nozzle. The main pipe penetrates from the proximal end to the distal end, but the distal end is closed and only the material injection nozzle is opened. (In the present invention, the side inserted into the coke oven is the distal end, and the front side is the base. Called the end, the same applies hereinafter). The thermal spray material is fed together with the reaction gas (for example, oxygen) from a supply hose connected to the base end, is pumped toward the tip, and blows out integrally with the reaction gas from the material injection nozzle toward the furnace wall. Since the furnace wall to be repaired is at a high temperature, the sprayed material and the reaction gas react on the surface of the furnace wall at a high temperature to form a new refractory layer on the furnace wall.

  Most of the lance body pipe is inserted into a coke oven and the majority is heated. Here, the thermal spray material and the reactive gas react for the first time on the furnace wall surface on the assumption that the ignition temperature does not reach the surface of the furnace wall to be sprayed, but when the main pipe is heated, the temperature of the thermal spray material and the reactive gas The risk of spontaneous ignition in the main pipe and backfire increases. Therefore, various lances, specifically, cooling means for the main body pipe have been proposed. Patent Document 1 proposes a lance equipped with air cooling means in order to eliminate the disadvantage that a protective cover for heat countermeasures is not sufficient, and a lance equipped with water cooling means becomes too heavy.

  The lance disclosed in Patent Document 1 includes air cooling means configured by wrapping a main body pipe (spraying lance) with a protective cover and interposing a cooling hose in a gap between the main body pipe and the protective cover (patent) Reference 1 [Claim 1] and others). Both the front end and the base end of the protective cover are open, and the compressed air (cooling air) discharged from the cooling hose is discharged from the front end to the outside of the protective case (Patent Document 1 [Claim 2] and others). . In addition, by inserting a plurality of cooling hoses in the gap between the main pipe and the protective cover, and making the insertion depth different from the base end, compressed air is discharged over the entire area of the main pipe. (Patent Document 1 [Claim 3] and others).

Japanese Patent Laid-Open No. 11-021557

  The lance disclosed in Patent Document 1 requires some cooling means. However, when the water cooling means is used, the lance becomes extremely heavy and avoids inconvenience in handling. Air cooling means is employed (see Patent Document 1 [0021]). An excessively long lance is supported by a dedicated support device, and all power is used for operations such as unwinding, pulling back, and rotation. However, there are still many lances that are directly operated by an operator. Reducing the weight of the lance is an important issue. Specifically, as the lance becomes heavier, the operability of moving the material injection nozzle to the furnace wall surface to be repaired accurately and in a short time decreases.

  However, the lance disclosed in Patent Document 1 is very irrelevant to the lance that does not have a cooling means, and a protective cover and a cooling hose are added, resulting in an increase in weight. There is no doubt. However, if these elements are omitted, the cooling means itself will be lost this time, and the problems associated with the heating of the main body pipe described above cannot be solved. Therefore, the air cooling means that is lighter than the water cooling means is adopted as the cooling means, and the lance operability associated with the increase in the weight is considerably improved by providing the air cooling means.

  As a result of the study, we developed a double-pipe structure in which a protective pipe is externally fitted to the main pipe that pumps the sprayed material with reactive gas in a lance that sprays the sprayed material onto the furnace wall when repairing the coke oven. Is a lance in which an air injection nozzle for injecting compressed air supplied to the gap between the main body pipe and the protection pipe is projected in the direction orthogonal to the extension of the protection pipe from the side surface near the closed end. The main body pipe is air-cooled by the compressed air supplied to the gap between the main body pipe and the protective pipe. The compressed air may simply be sent directly into the gap between the main body pipe and the protection pipe, or as disclosed in Patent Document 1, a cooling hose is inserted separately, and the gap between the main body pipe and the protection pipe is inserted from the cooling hose. You may send it to.

  The lance of the present invention uses the same air cooling means as the lance disclosed in Patent Document 1, but does not discharge the compressed air that has cooled the main body pipe from the tip of the protective pipe in the extending direction. It is different in that it is ejected from an air ejection nozzle projected in the orthogonal direction. At this time, if the air injection nozzle is directed downward, the compressed air is injected downward. The compressed air injected downward generates thrust upward on the tip of the lance, reduces the weight near the tip of the lance, and reduces the downward moment applied to the tip of the lance. Improve operability.

  The main body pipe has a nozzle attachment in which the material injection nozzle projects in the direction orthogonal to the extension of the main body pipe, and the material injection nozzle is freely set to an angle in the circumferential direction of the cross section of the main body pipe (hereinafter abbreviated as a circumferential direction angle). The attachment connection part to be attached and detached is provided at the tip and the material supply hose connection part is provided at the base end, and the protection pipe projects the air injection nozzle from the side surface near the closed tip in the direction perpendicular to the extension of the protection pipe. A connecting portion is provided at the base end.

  Detaching the nozzle attachment by setting the nozzle attachment to freely adjust the circumferential angle means that the circumferential angle of the material injection nozzle can be freely set when the nozzle attachment is attached to the attachment connecting portion. For example, if the attachment connecting part is a taper female thread part and the taper male thread part is formed at the base end of the short pipe constituting the nozzle attachment, the circumferential direction of the material injection nozzle depends on the amount of screwing of the nozzle attachment to the attachment connection part. The angle can be adjusted.

  The lance is used, for example, while changing the posture slightly upward or downward while keeping the spray nozzle in a horizontal posture. In this case, if the crossing angle between the circumferential direction angle of the material injection nozzle and the circumferential direction angle of the air injection nozzle is set in the range of 80 degrees to 100 degrees, the compressed air is generally injected downward, improving the operability of the lance. You can fully enjoy the effect. Also, since the material injection nozzle can freely set the circumferential angle, if the circumferential angle of the material injection nozzle is adjusted with the air injection nozzle facing downward, it can be applied to the ceiling, left and right sides or floor of the coke oven. On the other hand, a thermal spray material can be sprayed on each.

  The main body pipe has a nozzle attachment in which the material injection nozzle protrudes in the direction orthogonal to the extension of the main body pipe, and an attachment connection part that allows the material injection nozzle to be attached and detached at an angle in the cross-sectional circumferential direction of the main body pipe. A material supply hose connection portion is provided at the base end, and the protection pipe projects the air injection nozzle in the direction orthogonal to the extension of the protection pipe from the side surface near the closed tip, and the main body pipe and the protection pipe from the side surface near the closed base end. It is preferable that the support pipe communicating with the gap is extended to the side of the main body pipe and the air supply hose connection portion is provided at the base end of the support pipe.

  Thereby, the base end side of the main body pipe and the support pipe becomes the handle, respectively, and it becomes easy to perform operations such as swinging up and down or left and right using the support supporting the middle of the lance as a fulcrum and the center axis of the main body pipe as a center, Combined with the effect of reducing the moment by injecting compressed air from the air injection nozzle, the operability of the lance is improved. Since the main body pipe is usually linear in order to facilitate the pressure-feeding of the thermal spray material by the reaction gas, the support pipe is preferably extended to the side of the main body pipe. Here, the side of the main body pipe means that the support pipe as a whole projects in the direction orthogonal to the extension of the main body pipe. From this point of view, in consideration of a specific holding method, the support pipe may project to the side of the main body pipe and bend toward the base end in parallel with the main body pipe.

  In addition to this, one or both of the main body pipe and the protection pipe may project an auxiliary bar in the direction orthogonal to the main body pipe. For example, when both the main body pipe and the protective pipe are linear, the auxiliary bar protrudes laterally from the protective pipe, and the protective pipe and the auxiliary bar serve as a pair of handles. In addition, when the support pipe is extended to the side of the main body pipe from the vicinity of the closed base end of the protective pipe, the side of the support pipe protrudes from the side of the protective pipe protruding from the closed main end of the protective pipe. Then, the auxiliary bar is extended, and the support pipe and the auxiliary bar are used as a pair of handles.

  In particular, the support pipe and the auxiliary bar that are projected in a point-symmetrical positional relationship with the main body pipe as the center are a pair of left and right handles whose base ends are spaced apart from each other. Combined with reducing the moment by injecting compressed air from the injection nozzle, the operability of the lance is improved. In consideration of a specific holding method, the support pipe and the auxiliary bar may be bent in parallel with the main body pipe toward the base end. Since the auxiliary bar is a member that forms a handle with the support pipe, it may be a hollow bar (that is, a pipe) or a solid bar.

  The lance according to the present invention generates an upward thrust on the tip side of the lance by injecting compressed air, which is air-cooled in the main body nozzle, downward from an air injection nozzle provided near the tip of the lance. It reduces the weight near the tip and reduces the downward moment applied to the tip of the lance, improving the lance operability. The lance operability is considered to be improved by lifting the entire lance, but since the compressed air pressure available in general factories is not so high, the compressed air is injected intensively from the vicinity of the tip of the lance. Thus, by reducing the moment that most hinders the operability of the lance, the operability of the lance is improved by making the most effective use of compressed air that can be used in general factories.

  In addition, the lance of the present invention is provided with a support pipe that branches the protective pipe from the main body pipe by using a double pipe structure of the main pipe and the protective pipe that circulates the compressed air along the main body pipe. In addition, by providing an auxiliary bar that is paired with the support pipe, the operation of the lance itself is facilitated, and operability of the lance is coupled with weight reduction near the tip by injecting compressed air. Can be improved better. The addition of support pipes and auxiliary bars increases the weight of the entire lance, but the added weight is on the front side across the strut that supports the middle of the lance and does not increase the weight on the tip side. Since the balance of the moment across the fulcrum is also achieved, the operability of the lance is improved better.

It is a perspective view showing a use condition about an example of a lance to which the present invention is applied. It is a top view of the lance of this example. It is a side view of the lance of this example. FIG. 3 is a plan view corresponding to FIG. 2 of another example of the lance in which the auxiliary bar is omitted. FIG. 3 is a plan view corresponding to FIG. 2 of another example of the lance in which the support pipe and the auxiliary bar are omitted. FIG. 3 is a plan view corresponding to FIG. 2 of the lance of this example in which the direction of the material injection nozzle is reversed by 180 degrees. FIG. 3 is an enlarged horizontal sectional view taken along arrow A in FIG. 2 in the lance of this example. It is a vertical sectional view near the air injection nozzle in the lance of this example. It is XX sectional drawing in FIG. 8 in the lance of this example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the lance 1 of the present invention has a double-pipe structure (see FIGS. 7 to 9 described later) in which a protective pipe 13 is externally fitted to a main body pipe 11. The base end is closed, and a pair of support pipe 133 and auxiliary bar 14 are projected from the base end in a point-symmetrical positional relationship around the main body pipe 11. 1 to 3, the air injection nozzle 131 is directed downward, the material injection nozzle 121 is directed leftward when viewed from the base end side (operator) of the main body pipe 11, and about 1 m from the base end of the protective pipe 13. The case where an operator operates the support pipe 133 and the auxiliary bar 14 as a handle is shown in the figure.

  The main body pipe 11 is a straight metal pipe provided with an attachment connecting portion 111 at the distal end and a material supply hose connecting portion 112 at the proximal end. The lance 1 of this example is hidden behind the protective pipe 13 so that the main body pipe 11 is hardly visible and only slightly protrudes from the proximal end of the protective pipe 13. The attachment connecting portion 111 is formed of a cylindrical block having a taper female thread formed on the inner periphery, and constitutes an attachment portion of the nozzle attachment 12 from which the material injection nozzle 121 is projected. The attachment connecting portion 111 of this example also serves as a member that closes the gap between the main body pipe 11 and the protective pipe 13 and closes the tip of the protective pipe 13 (see FIG. 8).

The material supply hose connection part 112 is an attachment part to which the material supply hose 2 is connected, and a normal coupler is used. The coupler cannot be separated unless the externally fitted sleeve is operated. Thus, if a backfire occurs, the lance 1 and the material supply hose 2 are not separated from each other, and the material supply hose 2 is supplied from the spraying material TSM and oxygen O ₂ (reaction gas) supply device (not shown). As a result, the operator operating the lance 1 can be prevented from being damaged by flashback (fail safe). In particular, the lance 1 of this example has an operator with the support pipe 133 and the auxiliary bar 14 as a handle, and the material supply hose connection portion 112 positioned between the support pipe 133 and the auxiliary bar 14 is operated. These safety measures are important.

  The nozzle attachment 12 is a short metal pipe whose front end is closed by a plate material and whose rear end is communicated with the main body pipe 11, and the material injection nozzle 121 is protruded in the extending orthogonal direction of the main body pipe 11 from the vicinity of the closed front end. In the configuration, a tapered male screw portion 122 is formed on the outer peripheral surface of the base end. As a result, airtightness can be ensured without completely tightening the taper male thread portion 122 to the attachment connection portion 111 of the main body pipe 11, so that the direction of the material injection nozzle 121 is changed by adjusting the screwing amount. be able to. Specifically, while the air injection nozzle 131 is directed downward, the material injection nozzle 121 is directed left (see FIGS. 1 and 2) as viewed from the base end side of the main body pipe 11 (see FIG. 1 and FIG. 2). 2 and FIG. 6), it can correspond to both the left and right sides of the coke oven.

  The protection pipe 13 is a metal pipe that is shorter than the main body pipe 11 and has a similar cross-section whose inner diameter is larger than the outer diameter of the main body pipe 11. The tip of the protective pipe 13 where the gap with the main body pipe 11 opens is closed by the attachment connecting portion 111, and a nozzle mounting portion 135, which is a short metal pipe communicating with the gap, is provided on the side surface near the tip. The air injection nozzle 131 is detachably screwed to the nozzle mounting portion 135 (see FIG. 8). Accordingly, the air injection nozzle 131 is replaced according to the pressure of the supplied compressed air Air, and the nozzle diameter for injecting the compressed air Air can be adjusted.

  The base end of the protective pipe 13 where the gap with the main body pipe 11 is opened is closed by a plate material, and a support pipe 133 that is a bent metal pipe communicating with the gap is projected on the side surface near the base end (see FIG. 7). The support pipe 133 of this example is projected in a diagonal direction from the proximal end of the protective pipe 13 toward the front side, and then the part held by the operator is folded in the extending direction of the protective pipe 13 in a plan view. It is a letter shape. The protective pipe 13 connects the air supply hose 3 to an air supply hose connection part 132 provided at the base end of the support pipe 133 and receives supply of compressed air Air through the support pipe 133 to the gap with the main body pipe 11. The air supply hose connection part 132 also uses a coupler, like the material supply hose connection part 112 described above.

  In the lance 1 of this example, the auxiliary bar 14 that is paired with the support pipe 133 is projected from the side surface near the base end of the protective pipe 13. The auxiliary bar 14 does not need to communicate with the gap with the main body pipe 11, but is composed of the same metal pipe in consideration of the weight balance with the support pipe 133 to be paired. Further, the shape of the auxiliary bar 14 in plan view is the line symmetry of the support pipe 133 with the protection pipe 13 as the axis of symmetry, and the operator protrudes obliquely from the base end of the protection pipe 13 toward the front side. It is a letter shape in plan view in which a portion held by the hand is bent in the extending direction of the protective pipe 13.

  In addition, the lance 1 of this example is arranged at an equal interval in the circumferential direction on the outer surface of the main body pipe 11 so that the gap between the main body pipe 11 and the protective pipe 13 is formed with a uniform thickness in the circumferential direction of the cross section of the main body pipe 11. A set of three gap holding members 134 made of metal bars are provided at intervals of unit length (for example, 1 m) in the extending direction of the main body pipe 11 (see FIG. 9). As a result, the air resistance against the compressed air Air supplied to the gap between the main body pipe 11 and the protective pipe 13 is uniform in any part of the gap, and the compressed air Air is smoothly supplied, so that the main body pipe 11 is kept over the entire length. Can be air-cooled.

  The support pipe 133 and the auxiliary bar 14 are additional portions for improving the operability of the lance 1 and are not essential components in the present invention. For example, as shown in FIG. 4, the auxiliary bar 14 is omitted, and the support pipe 133 is protruded from the position close to the distal end side from the proximal end of the protective pipe 13, so that the proximal end portion of the protective pipe 13 is The support pipe 133 may be a pair of handles, and as shown in FIG. 5, the support pipe 133 and the auxiliary bar 14 are both omitted, and an air supply hose connection portion is provided on the side surface in the vicinity of the proximal end of the protection pipe 13. Only 132 may be provided.

As shown in FIGS. 1 and 7 to 9, the lance 1 of the present invention has a nozzle attachment 12 connected to the distal end of a main body pipe 11, and a material supply hose 2 connected to the base end. 2 sprays the sprayed material TSM and oxygen O ₂ from the material injection nozzle 121 protruding to the left of the main body pipe 11 through the main body pipe 11 and the nozzle attachment 12, and connects the air supply hose 3 to the base end of the support pipe 133. , After supplying the compressed air Air to the gap between the main pipe 11 and the protective pipe 13 through the support pipe 133 to cool the main pipe 11, the compressed air Air is projected downward from the protective pipe 13. Spray from nozzle 131. At this time, the compressed air injected downward generates an upward thrust on the tip side of the lance 1, reduces the weight in the vicinity of the tip of the lance 1, and reduces the downward moment applied to the tip of the lance 1. Improve the operability of the lance 1.

  In order to confirm how much the present invention improves the operability of the lance, an actual machine was actually produced and verified. The produced lances are the first embodiment and the second embodiment in which two types of protective pipes having different outer diameters with respect to the main body pipe are externally fitted in the configuration of the total length of 6 m seen in FIGS. Although the comparative example was not prepared about the lance which does not apply this invention, according to the test method mentioned later, the effect of this invention can fully be verified.

In Example 1, a stainless steel pipe having an outer diameter of 21.7 mm is used as a main pipe, and a stainless steel pipe having an outer diameter of 30 mm and a thickness of 1.5 mm is used as a protective pipe. Has a cross-sectional area of 2.03 cm ² . In the second embodiment, the main body pipe is a stainless steel pipe having an outer diameter of 21.7 mm as in the first embodiment, but a stainless steel pipe having an outer diameter of 34 mm and a thickness of 1.65 mm is used as a protective pipe, and the main body supplies compressed air. The cross-sectional area of the gap between the pipe and the protective pipe is 3.70 cm ² .

  In the lances of Example 1 and Example 2, both of the lances are supported by a support column at a position of 1.5 m from the material supply hose connection part toward the tip, and the tip is suspended from a hanging balance, and the air jet nozzle is directed downward. It was measured how much the weight near the tip was reduced when compressed air was jetted from the nozzle. The actually used suspension scale was a digital measurement type, and the state where compressed air was not injected was offset to the reference value (0), and the weight reduced as a negative value when compressed air was injected was measured. If the weight reduction near the tip of the lance can be measured, the downward moment applied to the tip of the lance becomes small, and it can be indirectly estimated that the operability of the lance has been improved.

  In Examples 1 and 2, the detachable air injection nozzle is replaced, and the nozzle diameter (the actual opening diameter through which compressed air is blown) is 4.0 mmφ, 4.5 mmφ, 5.0 mmφ, 5.5 mmφ, 6.0 mmφ, and 7.0 mmφ. In this case, compressed air of 0.4 MPa, 0.5 MPa, 0.6 MPa, and 0.7 MPa generally supplied in the factory was sequentially supplied, and the weight in the vicinity of the tip of the lance in each combination was measured. The measurement results are shown in Table 1. The numerical values shown in Table 1 are the weight reduction amounts measured by the measured suspension balance.

  From Table 1, when compressed air supplied in the factory is used for the lance of the present invention, weight reduction of at least 520 g (Example 1, compressed air pressure 0.4 MPa, air injection nozzle diameter 4.0 mmφ), Weight reduction of up to 1390 g (Example 2, compressed air pressure 0.7 MPa, air injection nozzle diameter 7.0 mmφ) was observed, and it was confirmed that the downward moment applied to the tip of the lance was reduced. During measurement, when the jet of compressed air was stopped from the state where the lance was supported while holding the support pipe and the auxiliary bar while injecting the compressed air, the moment of suddenly tilting the tip could be felt. It is confirmed from.

  In Example 2, the cross-sectional area of the gap between the main body pipe and the protective pipe is slightly less than twice that of Example 1, but the degree of weight reduction is not much different. From this, it is presumed that if the gap is equal to or larger than the cross-sectional area of Example 1, the effect of the present invention is not impaired. Further, when the pressure of compressed air is 0.5 MPa or less, the weight reduction peak occurs when the nozzle diameter of the air injection nozzle is 6 mmφ. From now on, if the pressure of compressed air supplied in the factory is 0.5 MPa or less, it is desirable to use an air injection nozzle with a nozzle diameter of 6 mmφ, and when compressed air with a higher pressure is supplied, the nozzle diameter is 7 mmφ or more. It can be seen that more weight can be reduced by using the air injection nozzle.

1 Lance
11 Body pipe
12 Nozzle attachment
13 Protective pipe
14 Auxiliary bar 2 Material supply hose 3 Air supply hose 4 Strut
Air compressed air
TSM Thermal Spraying Material
O ₂ oxygen (reactive gas)

Claims (4)

In the lance to spray the sprayed material on the furnace wall when repairing the coke oven,
A double pipe structure in which a protective pipe is externally fitted to the main pipe that pumps the thermal spray material with reactive gas.
The front end of the protective pipe is closed, and an air injection nozzle for injecting compressed air supplied to the gap between the main body pipe and the protective pipe is projected from the side surface near the closed front end in the extending orthogonal direction of the protective pipe. Lance. The main body pipe has a nozzle attachment in which the material injection nozzle protrudes in the direction orthogonal to the extension of the main body pipe, and an attachment connection part that allows the material injection nozzle to be attached and detached at an angle in the cross-sectional circumferential direction of the main body pipe. Each material supply hose connection is provided at the base end,
The lance according to claim 1, wherein the protective pipe has an air supply hose connecting portion provided at a base end thereof by causing an air injection nozzle to protrude in a direction orthogonal to the extending direction of the protective pipe from a side surface near the closed tip. The main body pipe has a material supply hose connection portion with a nozzle attachment in which the material injection nozzle projects in the direction orthogonal to the extension of the main body pipe, and an attachment connection portion that allows the material injection nozzle to be freely attached and detached in the circumferential direction of the cross section of the main body pipe. At the base end,
The protective pipe has an air injection nozzle protruding from the side surface near the closed tip in the direction orthogonal to the extension of the protective pipe, and a support pipe that communicates with the gap between the main body pipe and the protective pipe from the side surface near the closed base end. The lance according to claim 1, wherein the air supply hose connection portion is provided at a proximal end of the support pipe. The lance according to any one of claims 1 to 3, wherein one or both of the main body pipe and the protective pipe has an auxiliary bar protruding from a side of the main body pipe.

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