JP6493373B2 - Thermal spray lance - Google Patents

Description

  The present invention relates to a thermal spray lance, and more particularly, to a thermal spray lance for spraying a thermal spray material onto a furnace wall when repairing a coke oven.

  A coke oven for obtaining coke by dry distillation of coal has a structure in which a carbonization chamber and a heating chamber overlap each other. One coke oven usually has about 100 carbonization chambers. Each carbonization chamber is, for example, a thin box shape having a length of about 15 m, a height of about 5 m, and a width of about 45 to 50 cm, and both ends thereof can be opened and closed with a furnace lid, Is provided with an inlet through which coal can be input.

  When the dry distillation of coal is completed in this coke oven, the furnace lids at both ends of the carbonization chamber are opened, the coke is pushed out from one end by an extruder, and the coke is discharged from the other end. When the discharge of coke is completed, the furnace lids at both ends of the coking chamber are closed, coal is charged from the charging port, and coal is still distilled again. Usually, such a cycle is performed about once a day.

  The coke oven undergoes a temperature change once a day between the dry distillation of the coal and the discharge of the coke, and with this use, the temperature change causes cracks in the bricks constituting the furnace wall, resulting in delamination. Sometimes. Furnace walls may also be mechanically damaged by friction from coal and coke. When such damage occurs in the furnace wall of the carbonization chamber, coke grains may be caught in the damaged portion when the coke is extruded, and the extrusion resistance may become too large to be extruded. At this time, the furnace wall is pushed from the carbonization chamber to the heating chamber side, which may cause the brick wall surface to swell. Furthermore, when the damage to the joints of the brick increases, dry distillation gas (including tar, pitch, etc.) flows into the heating chamber through the joints, and dust and graphite are generated due to poor combustion, which adversely affects the environment. For this reason, such damage is appropriately repaired.

  Such repair methods include, for example, plasma spraying, laser spraying, flame spraying, etc., but in order to perform these, a large-scale device is required. A thermal spraying method using a metal oxidation exothermic reaction is used. In this thermal spraying method, a mixture (a thermal spray material) of a metal powder (a combustion agent) and a refractory powder is transported with oxygen, and this thermal spray material is sprayed on a high-temperature repair surface. The sprayed sprayed material forms a refractory composition by an oxidative exothermic reaction of the metal powder caused by receiving heat from the repair surface, and melts to adhere to the repair surface.

  In the repair of the furnace wall of the coke oven by such a spraying method, a spraying lance is used to spray the sprayed material onto the furnace wall. For example, as described in Patent Document 1, the thermal spray lance has a metal tube. In the repair of the furnace wall, after discharging the coke, open the furnace lid of the carbonization chamber, insert the thermal spray lance, and spray the sprayed material at the required location. A thermal spray lance with a short metal tube may be used near the furnace lid, but in order to repair the central portion of the carbonization chamber, it is necessary to use a thermal spray lance with a long metal tube of 5 to 10 m. is there.

Japanese Patent No. 5660815

  Such a long thermal spray lance has a problem that the operability is poor when the operation space is narrow, and that the tip hangs down due to elastic deformation of the metal tube, so that the operation is difficult. Further, when the metal tube is heated by the temperature in the carbonization chamber, the temperature of the metal tube increases, the elastic modulus thereof decreases, and the drooping deformation of the tip increases. As a result, the operation of the thermal spray lance becomes more difficult.

  The present invention has been made to solve such problems, and an object thereof is to provide a thermal spray lance with improved operability.

The thermal spray lance according to the present invention includes a proximal lance, a distal lance, and a cylindrical tensile tube, and the proximal lance and the distal lance are detachably connected inside the tensile tube. Fins protruding from the outer peripheral surface so as to straddle one or both outer peripheral surfaces of the proximal lance and the distal lance are provided inside, or a fin protruding from the inner peripheral surface of the tensile tube is provided. in in a state where the proximal lance tip side lances connected, fins, contacts the inner peripheral surface or outer peripheral surface opposed to the tension tube, previously end than the fin, the outer peripheral surface of the distal end side lance in that have support for supporting it is provided a tip side lance in contact.
A fin receiving portion protruding from the inner peripheral surface or the outer peripheral surface is provided on the inner peripheral surface or the outer peripheral surface opposed to the fin, and the fin is a fin in a state where the proximal lance and the distal lance are connected in the tension pipe. You may contact | abut to a receiving part.
Each of the proximal lance and the distal lance has a first tube through which the spray material flows, and either the proximal lance or the distal lance protrudes from the end of the connection side. The projecting portion is configured to extend in this manner, and the projecting portion can be inserted from the connection-side end of the first tube of either the proximal lance or the distal lance toward the other end. The insertion part may be configured to have an inner diameter, and a protrusion may be inserted into the insertion part to connect the first tubes of the proximal lance and the distal lance.
Each of the proximal lance and the distal lance has a double pipe structure including a second tube formed so as to surround the first tube. A hole that communicates the second tube and the inside of the tensile tube may be formed.
The cooling gas may flow through the second pipes of the proximal lance and the distal lance.

  According to the present invention, since the thermal spray lance can be configured by connecting the proximal lance and the distal lance, the operability can be improved even if the work space is narrow.

It is sectional drawing of the thermal spray lance which concerns on embodiment of this invention. It is sectional drawing along the II-II line of FIG. It is sectional drawing for demonstrating the assembly procedure of the thermal spray lance which concerns on this embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, a thermal spray lance 1 is a cylindrical lance 2, a tip lance 3, and a cylindrical shape in which one end is completely opened and an annular edge 4 a is provided at the other end. A tension tube 4 and a tip nozzle 5 attached to the tip of the tip side lance 3 are provided. A part of each of the proximal lance 2 and the distal lance 3 is inserted into the tension tube 4, and the proximal lance 2 and the distal lance 3 are connected inside the tensile tube 4. Since the inner diameter of the circular opening defined by the inner edge portion 4b of the end edge portion 4a is the same as the outer diameter of the distal end side lance 3, the inner edge portion 4b comes into contact with the outer peripheral surface of the distal end side lance 3, thereby The portion 4a supports the tip side lance 3. Here, the end edge portion 4 a constitutes a support portion that supports the distal end side lance 3. A clamp 6 is provided on the outer peripheral surface of the proximal lance 2, and a hook portion 7 is provided on the outer peripheral surface of the tension tube 4. When the clamp 6 is engaged with the hook portion 7, the tension is increased. The tube 4 is fixed to the proximal lance 2. Two substantially L-shaped handles 8 for an operator to hold when operating the thermal spray lance 1 are provided so as to extend from the outer peripheral surface of the hand side lance 2.

  Inside the tension tube 4, a plurality of fins 21 are provided on the outer peripheral surface of the distal end lance 3 so as to protrude from the outer peripheral surface. A fin receiving portion 22 that protrudes from the inner peripheral surface and abuts against the fin 21 is provided on the inner peripheral surface of the tension tube 4. Inside the tension tube 4, an O-ring accommodating portion 24 is provided along the circumferential direction on the outer peripheral surface of the proximal lance 2, and an O-ring 25 is accommodated in the O-ring accommodating portion 24. Further, in the tension tube 4, an O-ring pressing portion 26 is provided along the circumferential direction on the outer peripheral surface of the distal end lance 3, and an O-ring 27 is provided adjacent to the O-ring pressing portion 26. ing. The O-ring 25 is brought into contact with the inner peripheral surface of the tensile tube 4 and the O-ring 27 is brought into contact with the end edge portion 4a of the tensile tube 4, whereby the inside of the tensile tube 4 is sealed from the outside. Yes. As shown in FIG. 2, the plurality of fins 21 are provided at equal intervals in the circumferential direction of the outer peripheral surface of the tip side lance 3, and gaps 23 are formed between the fins 21 adjacent in the circumferential direction.

  As shown in FIG. 1, the proximal lance 2 has a double tube structure including an inner tube 11 that is a first tube and an outer tube 12 that is a second tube. The tip side lance 3 also has a double tube structure including an inner tube 13 as a first tube and an outer tube 14 as a second tube. Both ends of the inner pipes 11 and 13 are open. The outer tube 12 is closed at both ends. The outer tube 14 opens at the end portion on the distal end side of the distal end side lance 3 and the other end portion is closed. A coupler 15 having a flow passage 16 is connected to the end of the hand side lance 2 on the hand side, and a supply source of a thermal spray material (not shown) and the inner pipe 11 can communicate with each other via the flow passage 16. The inner tube 11 and the inner tube 13 are in communication with each other inside the tension tube 4, whereby the tip nozzle is supplied from the spraying material supply source sequentially through the flow passage 16, the inner tube 11, and the inner tube 13. The thermal spraying material supplied from the thermal spraying material supply source is sequentially circulated through these nozzles 5 and ejected from the tip nozzle 5.

  Inside the tension tube 4, a hole 17 is provided on the outer peripheral surface of the proximal lance 2, and the outer tube 12 and the inside of the tension tube 4 communicate with each other through the hole 17. Further, a hole 18 is provided in the outer peripheral surface of the distal end side lance 3, and the outer tube 14 and the inside of the tension tube 4 communicate with each other through the hole 18. Since a gap 23 is formed between each of the plurality of fins 21 (see FIG. 2), the outer tube 12 and the outer tube 14 communicate with each other through the hole 17, the gap 23, and the hole 18 sequentially. doing. On the outer peripheral surface of the proximal lance 2 outside the tension tube 4, an inlet 19 for communicating a supply source of a cooling gas (for example, cooling air) (not shown) and the outer tube 12 is provided. As a result, the cooling gas supplied from the supply source sequentially flows through the outer tube 12, the hole 17, the gap 23, the hole 18, and the outer tube 14, and the end portion on the distal end side of the distal end side lance 3. It comes to be discharged from.

  When using the thermal spray lance 1, the operator lifts the thermal spray lance 1 by holding the two handles 8 with their hands. If the thermal spray lance 1 is not a combination of the proximal lance 2 and the distal lance 3 but is composed of a single metal tube, the portion where the two handles 8 are connected to the outer peripheral surface of the proximal lance 2 As a fulcrum, the portion from the fulcrum to the tip nozzle 5 hangs down due to the downward force applied to the tip nozzle 5. However, in the thermal spray lance 1, the contact position between the inner edge portion 4 b of the end edge portion 4 a of the tensile tube 4 and the outer peripheral surface of the distal end side lance 3 is used as a fulcrum, and the contact portion between the fin 21 and the fin receiving portion 22 acts. As a point, both of them have a structure that supports the downward force applied to the tip nozzle 5, and the force is appropriately dispersed, so that the thermal spray lance 1 does not easily hang down. Further, when the thermal spray lance 1 is used, it is possible to cool the proximal lance 2 and the distal lance 3 by flowing the cooling gas through the outer tubes 12 and 14, thereby suppressing the decrease in their elastic modulus. 1 is less likely to sag. As a result, the entire spray lance 1 can be prevented from drooping, and the operator can easily operate the spray lance 1.

Next, a procedure for assembling the thermal spray lance 1 from the proximal lance 2, the distal lance 3, the tension tube 4, and the distal nozzle 5 will be described with reference to FIG.
The end on the distal end side of the distal end lance 3 is inserted into the tensile tube 4 from the end of the tensile tube 4 on the side where the end edge 4a is not provided, and a circle defined by the inner edge 4b of the end edge 4a. The end portion on the distal end side of the distal end side lance 3 is taken out of the tensile tube 4 from the opening of the shape, and the distal end side lance 3 is further pulled to bring the O-ring 27 into contact with the end edge portion 4a. In this state, the position where both are provided is adjusted so that the fin 21 contacts the fin receiving portion 22.

  Next, from the end portion of the tensile tube 4 on the side where the end edge portion 4a is not provided, the end portion of the proximal lance 2 on the side connected to the distal end lance 3 (hereinafter referred to as “the connecting side of the proximal lance 2”). The end portion (referred to as “end”) is inserted into the tension tube 4. In the hand side lance 2, the inner pipe 11 protrudes from the end portion on the connection side of the hand side lance to form a protruding portion 31. The protrusion 31 is provided with an O-ring 33. On the other hand, the inner tube 13 of the distal lance 3 is connected to the distal end lance 3 from the end of the distal lance 3 on the side connected to the proximal lance 2 (hereinafter referred to as the “end of the distal lance 3 on the connection side”). An insertion portion 32 that is a portion having an inner diameter into which the protruding portion 31 can be inserted is formed toward the end portion. By inserting the protruding portion 31 into the insertion portion 32, the connection portion between the inner tube 11 and the inner tube 13 is connected with the O-ring 33 being sealed, and the proximal lance 2, the distal lance 3, Is connected.

  In this state, the tension tube 4 is fixed to the proximal lance 2 by engaging the clamp 6 with the hook portion 7. Finally, the tip nozzle 5 is attached to the tip of the tip lance 3 and the coupler 15 is attached to the hand end of the hand lance 2 to assemble the thermal spray lance 1.

Thus, since the thermal spray lance 1 can be configured by connecting the proximal lance 2 and the distal lance 3, the operability of the thermal spray lance 1 can be improved even if the work space is narrow.
Further, the fin 21 provided so as to protrude from the outer peripheral surface of the distal end side lance 3 inside the tensile tube 4 and the fin receiving portion 22 provided so as to protrude from the inner peripheral surface of the tensile tube 4 abut. Since the end edge 4a provided at the end of the tensile tube 4 supports the tip side lance 3, the downward force applied to the tip nozzle 5 is supported and this force is appropriately dispersed. In addition, it is possible to improve the operability of the thermal spray lance 1 by suppressing the sagging of the entire thermal spray lance 1.

  In this embodiment, the fins 21 are provided on the tip side lance 3, but the present invention is not limited to this form. The hand side lance 2 and the tip side lance 3 may be provided separately on the outer peripheral surface near the end of the connection side of the hand side lance 2 and the tip side lance 3. Sometimes, the fins 21 may be configured so as to straddle the outer peripheral surfaces thereof. Further, the fin 21 is provided so as to protrude from the outer peripheral surface of the proximal lance 2 or the distal end lance 3 and the fin receiving portion 22 is provided so as to protrude from the inner peripheral surface of the tensile tube 4. The fin 21 may be provided so as to protrude from the inner peripheral surface of the fin 4, and the fin receiving portion 22 may be provided so as to protrude from the outer peripheral surface of the proximal lance 2 or the distal end lance 3. Further, the fin receiving portion 22 is not provided, that is, the fin 21 is provided so as to protrude from the outer peripheral surface of the proximal lance 2 or the distal end lance 3 and the fin 21 contacts the inner peripheral surface of the tensile tube 4. Alternatively, the fin 21 may be provided so as to protrude from the inner peripheral surface of the tension tube 4 and the fin 21 may be in contact with the outer peripheral surface of the proximal lance 2 or the distal lance 3.

  In this embodiment, the support portion that supports the distal end side lance 3 is the ring-shaped end edge portion 4 a provided at the end portion of the tensile tube 4, but is not limited to this configuration. As long as the tip side of the thermal spray lance 1 is closer to the fin receiving part 22 than the fin receiving part 22, it may not be provided at the end part of the tension tube 4.

  In this embodiment, by inserting the protruding portion 31 of the inner tube 11 into the insertion portion 32 of the inner tube 13, the proximal lance 2, the distal lance 3, and the inner tube 11 are connected to the inner tube 13. However, the present invention is not limited to this form. The protruding portion 31 may be formed on the inner tube 13 and the insertion portion 32 may be formed on the inner tube 11. In addition to the configuration in which one of the inner pipes 11 and 13 is inserted into the other, if the connection portion of both is sealed and the both can be connected, the proximal lance 2 can be formed from the outside of the thermal spray lance without forming the protruding portion and the insertion portion. They may be connected by any known method such as fixing the connecting portion between the lance 3 and the tip lance 3.

  In this embodiment, the thermal spray lance 1 has a double tube structure, but may have a single tube structure having only the inner tubes 11 and 13.

  1 Thermal spray lance, 2 proximal lance, 3 distal lance, 4 tension tube, 4a end edge (support), 11 (hand lance) inner tube (first tube), 12 (hand lance) Outer tube (second tube), 13 (front end lance) inner tube (first tube), 14 (tip end lance) outer tube (second tube), 21 fin, 22 fin receiving portion, 31 Projection part, 32 insertion part.

Claims (5)

The lance on the hand side,
The tip side lance,
A tubular tensile tube and
The proximal lance and the distal lance are detachably connected within the tension tube ,
Fins projecting from the outer circumferential surface so as to straddle one or both outer circumferential surfaces of the proximal lance and the distal lance inside the tensile tube, or projecting from the inner circumferential surface of the tensile tube Fins are provided,
In the state where the proximal lance and the distal lance are connected in the tension pipe, the fins abut against the opposing inner peripheral surface or the outer peripheral surface,
The thermal spraying lance in which the supporting part which contacts the outer peripheral surface of the said front end side lance and supports this front end side lance is provided in the said tension pipe at the front end side rather than the said fin . The inner peripheral surface or the outer peripheral surface facing the fin is provided with a fin receiving portion protruding from the inner peripheral surface or the outer peripheral surface, and the proximal lance and the distal lance are connected in the tension pipe in state, the fin abuts the fin receiving portion, spray lance according to claim 1. Each of the proximal lance and the distal lance has a first pipe through which a thermal spray material flows,
The first tube of either the proximal lance or the distal lance extends so as to protrude from the end of the connection side, and a protruding portion is configured.
The insertion portion is configured such that the projecting portion has an inner diameter that allows insertion from the connection-side end portion of the other first tube of either the proximal lance or the distal-end lance to the other end portion. Has been
The thermal spray lance according to claim 1 or 2 , wherein the protruding portion is inserted into the insertion portion, and the first tubes of the proximal lance and the distal lance are connected to each other. Each of the proximal lance and the distal lance has a double tube structure including a second tube formed so as to surround the first tube,
The thermal spray lance according to claim 3 , wherein each of the proximal lance and the distal lance is formed with a hole communicating the second pipe and the inside of the tensile pipe. The thermal spray lance according to claim 4 , wherein a cooling gas flows through the second pipe of each of the proximal lance and the distal lance.

Images