Burner for heating the tube body

Abstract

To provide a pipe body heating burner that has a novel structure capable of readily heating a pipe body in a short time.SOLUTION: A pipe body heating burner 10 is provided with a combustion gas ejection hole 56 in a tip nozzle part 52 of a burner body 14 which is positioned in a plurality of parts in a circumferential direction on an outer peripheral surface of the tip nozzle part 52 and open toward an outer periphery without opening in an axial direction of the tip nozzle part 52.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a burner for heating a pipe body used when removing a pipe body, such as a water pipe in a boiler, and a method for removing a pipe body in a boiler, for example, when replacing the pipe body.

Background Art

[0002] Generally, in a boiler, a structure is adopted in which a pipe body such as a water pipe is connected to a support wall member such as a drum. Further, when repairing or maintaining the boiler, it is necessary to remove the pipe body from the support wall member and replace it. Therefore, conventionally, a connection structure has been adopted in which the opening end of the pipe body inserted through the mounting hole formed in the support wall member is fitted and fixed by expanding the diameter and attached. According to such a connection structure of the pipe body, unlike a connection structure by welding or the like, since the pipe body is fixed as a separate member without being integrated with the support wall member, the removal of the pipe body is facilitated.

[0003] Specifically, as in the conventional example shown in FIG. 13, a method is often adopted in which an external force is applied to the opening end of the pipe body protruding from the mounting hole using a hammer device or the like to deform the opening end of the fitted and fixed pipe body and extract it from the mounting hole. According to this, it can be carried out with mechanically simple equipment, and the implementation cost can also be suppressed.

[0004] However, when deforming the opening end of the pipe body inward, it is difficult to avoid damage to the support wall member due to contact between the hammer device or the like and the support wall member, and particularly at the opening peripheral edge of the mounting hole, which is important for ensuring the sealing performance at the joint portion between the pipe body and the support wall member, the support wall member was easily damaged.

[0005] Further, for example, when the support wall member is thick and the length of the insertion and fixing portion of the pipe body with respect to the support wall member is long, it is difficult to sufficiently reduce the fixing force of the pipe body with respect to the support wall member only by deforming the opening end of the pipe body, and there are cases where the pipe body cannot be removed.

[0006] Therefore, in recent years, the removal of a tubular body by high-frequency induction heating has also been proposed. That is, a coil is inserted into the open end portion of the tubular body inserted and fixed to the support wall member, and by applying a high-frequency voltage to the coil, the open end portion of the tubular body located around the coil is heated over the entire circumference by high-frequency induction heating. Then, after heating the open end portion of the tubular body, it is cooled, and the diameter is reduced by thermal contraction to reduce the fixing force between the tubular body and the support wall member, and the tubular body is removed from the support wall member. According to such removal of the tubular body by high-frequency induction heating, damage to the support wall member can be avoided, and in particular, damage to the support wall member at the opening peripheral edge of the mounting hole can be prevented.

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in order to perform high-frequency induction heating, a large-scale device is required, and it is difficult to perform preparatory work and electrical operation control settings corresponding to each boiler, and specialized knowledge is required, so it could not be easily implemented. Also, due to the above circumstances, the cost required for implementation is high, and there have been many cases where it is difficult to adopt.

[0008] The problem to be solved by the present invention is to provide a burner for heating a tubular body with a novel structure that can easily heat the tubular body in a short time.

[0009] Another object of the present invention is to provide a novel method for removing a tubular body in a boiler, which can easily remove a tubular body with its open end portion inserted and fixed into the mounting hole of a drum in a boiler in a short time while suppressing the risk of damage to the drum, and can also suppress the implementation cost.

Means for Solving the Problems

[0010] Hereinafter, preferred embodiments for understanding the present invention will be described. However, each of the embodiments described below is described by way of example, and not only can they be adopted in appropriate combinations with each other, but also regarding the plurality of components described in each embodiment, they can be recognized and adopted independently as much as possible, and can also be adopted in combination with any of the components described in other embodiments as appropriate. Accordingly, in the present invention, various other embodiments can be realized without being limited to the embodiments described below.

[0011] In order to solve the above problems, the present inventor first considered heating a tubular body with a burner having a conventional structure. Generally, as shown in FIG. 14, the burner is provided with a jet outlet for ejecting combustion gas at the tip portion, and a flame is formed in the tip direction. Then, the operator inserts the tip portion of the burner into the open end portion of the tubular body and blows the flame against the inner surface of the tubular body to heat the tubular body.

[0012] However, in the burner with the conventional structure, since only one part of the tubular body is heated, it has been clarified that it takes time to heat the tubular body when it is necessary to heat the tubular body over a wide range in the circumferential direction. Further, in order to heat the tubular body over a wide range with the burner having the conventional structure, it is necessary for the operator to move the burner during heating, and the heating operation becomes troublesome and difficult. In addition, the burner with the conventional structure needs to direct the tip where the flame is formed toward the inner surface of the tubular body, and since the tip portion is inserted so as to be inclined with respect to the central axis of the tubular body, when the tubular body has a small diameter, it may be difficult to insert the tip portion into the tubular body in an appropriate orientation. Among these multiple problems, the long time required for the heating operation is particularly problematic. With the increase in the heating time, there are concerns that the working environment may deteriorate due to radiant heat or the like, the heat diffusion due to heat transfer may increase and the heating efficiency may further decrease, or the supporting wall member may be adversely affected by heat transfer.

[0013] As a result of further study on heating by such a burner for heating a tubular body, the present invention has been achieved. The first aspect of the present invention is a burner for heating a tubular body, wherein the gas outlet for combustion at the tip nozzle portion of the burner body is not opened in the axial direction of the tip nozzle portion, but is provided at a plurality of circumferential positions on the outer peripheral surface of the tip nozzle portion and opens toward the outside. In the burner main body, the tip nozzle portion is provided at the tip of a gas pipeline through which premixed combustion gas is guided. The gas pipeline has a bent portion in the middle of its length direction. A cylindrical cooling jacket that covers the outer periphery of the gas pipeline and forms a cooling cavity on the outer peripheral surface of the gas pipeline extends from the tip nozzle portion toward the base end side. The cooling jacket has a base end side cylindrical portion and a tip end side cylindrical portion that linearly extend from the bent portion of the gas pipeline toward the base end side and the tip end side in the length direction, respectively, and are connected on the outer peripheral side of the bent portion. The cooling cavity is formed across both the base end side portion and the tip end side portion of the gas pipeline from the bent portion. A water supply pipeline for supplying cooling fluid to the cooling cavity is in a straight tubular shape that extends from the base end toward the tip end along the gas pipeline within the base end side cylindrical portion of the cooling jacket. The water supply pipeline opens toward the inner peripheral surface of the tip end side cylindrical portion at the tip portion of the base end side cylindrical portion, so that the cooling fluid supplied through the water supply pipeline is discharged toward the inner peripheral surface of the tip end side cylindrical portion. A drain pipeline for draining the cooling fluid from the cooling cavity is provided in the base end side cylindrical portion. is provided.

[0014] According to the burner for heating a tubular body having a structure according to this aspect, since the gas outlets that open toward the outer periphery of the tip nozzle portion are provided at a plurality of circumferential positions, a plurality of flames formed from the gas outlets toward the outer peripheral side can simultaneously heat a tubular body such as a water pipe used in a boiler, for example, from the inner peripheral side at a plurality of circumferential positions. Therefore, when it is necessary to heat the tubular body at a plurality of circumferential positions or over a wide range, the time required for heating the tubular body can be significantly shortened as compared with heating by a burner having a conventional structure.

[0015] In addition, in a conventional burner in which only one flame is formed at the tip, in order to heat the tubular body at a plurality of circumferential positions or over a wide range, it is necessary to rotate and move the burner to change the position where the flame hits the tubular body in the circumferential direction. However, in this aspect, since the plurality of gas outlets are provided spaced apart from each other in the circumferential direction, the rotation operation of the burner is made easier or unnecessary, and the heating work becomes easier.

[0016] Heating of the tubular body by the burner does not require large-scale equipment such as high-frequency induction heating, and does not require complicated control according to the heating target or the like, so it can be carried out simply and at low cost.

[0017] Since a flame is formed in a direction toward the outside, when inserting the tip nozzle portion of the burner into the tubular body, it is not necessary to incline the central axis of the tip nozzle portion with respect to the axial direction of the tubular body, and it may be inserted so that the central axis of the tip nozzle portion and the axial direction of the tubular body are substantially parallel. Therefore, the tip nozzle portion can be inserted into a relatively thin tubular body, and it is also possible to insert the tip nozzle portion deeper into the tubular body. Furthermore, by cooling the gas pipeline with the cooling fluid in the cooling cavity, flashback to the gas pipeline through which the premixed combustion gas is guided is prevented. In addition, since the cooling cavity is provided so as to reach not only the tip end side portion but also the base end side portion, the combustion gas up to the tip nozzle portion is sufficiently cooled, and the occurrence of flashback is more effectively prevented.

[0018] A second aspect is the burner for heating a tubular body described in the first aspect, wherein a plurality of the ejection ports are located at a plurality of positions spaced apart from each other in the circumferential direction of the tip nozzle portion, and the plurality of ejection ports are evenly provided at four or more positions in the circumferential direction of the tip nozzle portion.

[0019] According to the burner for heating a tubular body having a structure according to this aspect, by forming flames directed toward the outside at four or more positions in the circumferential direction, the tubular body can be simultaneously heated over a wide range in the circumferential direction without rotating the burner significantly. Depending on the number of formed ejection ports, the diameter of the ejection ports (the shape and size of the formed flame), the diameter of the tubular body, etc., for example, it is also possible to simultaneously heat the entire circumference of the tubular body by simply holding it in the orientation at the time of insertion without rotating the burner.

[0020] A third aspect is the burner for heating a tubular body described in the first or second aspect, wherein the ejection ports are located at a plurality of positions spaced apart from each other in the axial direction of the tip nozzle portion, and are respectively located at a plurality of positions in the circumferential direction.

[0021] According to the burner for heating a tubular body having a structure according to this aspect, the tubular body can be simultaneously heated over a wider range in the axial direction by the flames formed at the ejection ports provided at a plurality of positions in the axial direction of the tip nozzle portion. Therefore, even when the portion to be heated in the tubular body is long in the tube axis direction, the portion to be heated can be heated in a short time without significantly moving the burner in the tube axis direction.

[0022] The fourth aspect is the burner for heating a tube described in the third aspect, wherein the plurality of ejection ports respectively provided on the circumferential lines adjacent to each other in the axial direction of the tip nozzle portion are each located at a plurality of positions separated from each other on the circumferential line, and the ejection ports located on each circumferential line are displaced from each other in the circumferential direction so as not to overlap each other in the axial projection.

[0023] According to the burner for heating a tube having a structure according to this aspect, the tube can be heated simultaneously at a plurality of positions different in the axial direction and the circumferential direction, and it becomes possible to heat the tube simultaneously in a wider range.

[0024] The fifth aspect is the burner for heating a tube described in any one of the first to fourth aspects, wherein the ejection port opens in the radial direction of the tip nozzle portion.

[0025] According to the burner for heating a tube having a structure according to this aspect, since the flame formed at the ejection port extends in the radial direction, it becomes easy to blow the flame to a predetermined position on the inner peripheral surface of the tube, and the tube can be efficiently heated.

[0026] The sixth aspect is the burner for heating a tube described in any one of the first to fifth aspects, wherein the opening area of the ejection port is 1 / 5 or less of the cross-sectional area of the flow path of the combustion gas inside the tip nozzle portion.

[0027] According to the burner for heating a tube having a structure according to this aspect, since the opening area of the ejection port is made sufficiently small with respect to the cross-sectional area of the flow path of the combustion gas, even if a plurality of ejection ports are connected to the flow path of the combustion gas in the tip nozzle portion, the necessary combustion gas is supplied to each ejection port at a sufficiently high pressure, and an appropriate flame can be obtained.

[0028] The seventh aspect is the burner for heating a tube described in any one of the first to sixth aspects, wherein the The above-mentioned A block-shaped tip nozzle portion having a thicker peripheral wall than the gas pipeline is provided at the tip of the gas pipeline. The above-mentioned Cooling fluid is guided. The above-mentioned A cooling cavity is formed so as to surround the gas pipeline at least at the tip portion of the gas pipeline, and the tip-side wall portion of the cooling cavity is constituted by the tip nozzle portion, so that the cooling cavity reaches the tip nozzle portion.

[0029] According to the burner for heating a pipe body having the structure according to this aspect, backfire with respect to the gas pipeline through which the premixed combustion gas is guided is prevented by cooling the gas pipeline with the cooling fluid in the cooling cavity. In particular, since the cooling cavity reaches the tip nozzle portion, the tip nozzle portion is cooled, and backfire of the combustion gas into the tip nozzle portion is prevented.

[0030] The eighth aspect is the burner for heating a pipe body described in the seventh aspect. Straight constituting a joint portion that linearly extends and is gripped by an operator The above-mentioned of the gas pipeline The above-mentioned The tip-side portion of the gas pipeline including the tip nozzle portion is relatively inclined and extends with respect to the base-end side portion of the gas pipeline. The above-mentioned And

[0031] According to the burner for heating a pipe body having the structure according to this aspect, since the base-end side portion of the gas pipeline that constitutes the joint portion gripped by the operator is inclined with respect to the tip-side portion of the gas pipeline including the tip nozzle portion, when the operator performs a heating operation in a narrow work space, it becomes easier to handle the burner for heating a pipe body.

[0033] The ninth aspect is the burner for heating a pipe body described in the eighth aspect, in which a cooling fluid pipeline through which the cooling fluid flows is housed in a joint housing together with the gas pipeline and constitutes a joint portion gripped by an operator.

[0034] According to the burner for heating a tube body structured according to this aspect, if the joint portion is constituted by a gas pipeline and a cooling fluid pipeline that independently extend, the operator will have to grip a plurality of pipelines, making it difficult to perform the work due to the difficulty of gripping. Therefore, by housing the gas pipeline and the cooling fluid pipeline in the joint housing and integrating them, it becomes easier for the operator to grip the joint portion (joint housing), improving workability.

Effect of the Invention

[0042] According to the present invention, the tube body can be easily heated by a flame in a short time. For example, in the operation of removing the tube body from the drum of a boiler using heat shrinkage, the insertion and fixing portion of the tube body into the drum can be easily heated in a short time.

Brief Description of the Drawings

[0043]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

BEST MODE FOR CARRYING OUT THE INVENTION

[0044] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0045] FIG. 1 shows a burner 10 for heating a tube body (hereinafter referred to as a burner) as a first embodiment of the present invention. The burner 10 has a longitudinal burner body 14 provided with a gas pipeline 12. The burner body 14 is entirely formed of a metal material.

[0046] The base end portion of the burner body 14 is constituted by a fuel port 16 and an oxygen port 18. The fuel port 16 has a substantially cylindrical shape, and a fuel cylinder (not shown) is connected thereto so that fuel gas is supplied. As the fuel supplied from the fuel cylinder to the fuel port 16, for example, acetylene gas, hydrogen gas, liquefied petroleum gas, etc. are adopted. The oxygen port 18 has substantially the same cylindrical shape as the fuel port 16, and an oxygen cylinder (not shown) is connected thereto so that oxygen is supplied. The oxygen port 18 does not necessarily need to supply only oxygen, and for example, air which is a gas mixture containing oxygen may be supplied. Both the fuel port 16 and the oxygen port 18 constitute the base end portion of the gas pipeline 12, and the base end opening of the gas pipeline 12 is constituted by two openings, i.e., the base end opening of the fuel port 16 and the base end opening of the oxygen port 18.

[0047] The fuel port 16 and the oxygen port 18 are connected to a Y-shaped member 20 with a bifurcated proximal end. The Y-shaped member 20 has an inner hole with two proximal openings and one distal opening, and one of the fuel port 16 and the oxygen port 18 is fixed to each of the proximal openings by means such as screwing. As a result, the bifurcated gas pipeline 12 at the proximal end merges at the distal end portion of the Y-shaped member 20. The Y-shaped member 20 is provided with a screw-type valve for adjusting the flow rate of the inner hole communicating with the oxygen port 18, and the supply amount of oxygen can be adjusted by rotating the first handle 22.

[0048] An internal pipeline 24 constituting the proximal end side portion of the gas pipeline 12 is attached to the distal opening of the Y-shaped member 20. The internal pipeline 24 is composed of a linearly extending cylindrical pipe, and the proximal end portion is inserted into the distal opening of the Y-shaped member 20. The outer periphery of the internal pipeline 24 is surrounded by a coupling housing 26. The coupling housing 26 has a substantially cylindrical shape and is provided in an externally inserted state at a position separated from the internal pipeline 24 on the outer peripheral side. The proximal end opening is fixed to the distal end portion of the Y-shaped member 20 in an externally inserted state. The coupling housing 26 of the present embodiment is configured by screwing together two substantially semi-cylindrical parts, but it can also be configured by only one part having a substantially cylindrical shape. When heating the pipe body by the burner 10, the operator holds the coupling housing 26 and performs the heating operation. Therefore, the coupling housing 26 serves as the coupling portion of the burner 10, and the internal pipeline 24 located on the inner periphery of the coupling housing 26 serves as the portion constituting the coupling portion in the gas pipeline 12.

[0049] A flow rate adjusting member 28 is attached to the tip side of the internal pipe 24. The flow rate adjusting member 28 includes an adjusting portion main body 30 that extends substantially parallel to the internal pipe 24. The adjusting portion main body 30 has a substantially cylindrical shape, and a flow rate adjusting valve 32 is inserted into the inner hole. The flow rate adjusting valve 32 has a conical surface with a smaller diameter toward the tip at the tip portion, and is provided on the tip side of a slide shaft 34 screwed to the base end opening portion of the adjusting portion main body 30, so that it can move to the tip side and the base end side. Then, as the slide shaft 34 moves to the tip side by rotation, the flow rate adjusting valve 32 approaches the tip side facing surface in the inner hole of the adjusting portion main body 30, and the flow rate in the inner hole of the adjusting portion main body 30 decreases. On the other hand, as the slide shaft 34 moves to the base end side by rotation, the flow rate adjusting valve 32 separates from the tip side facing surface in the inner hole of the adjusting portion main body 30, and the flow rate in the inner hole of the adjusting portion main body 30 increases. Note that the base end portion of the slide shaft 34 protrudes to the base end side of the flow rate adjusting member 28, and a second handle 36 is provided on the protruding portion, making it easier for the operator to operate the flow rate adjusting valve 32.

[0050] The flow rate adjusting member 28 includes a side connection portion 38 that extends laterally from the adjusting portion main body 30. The side connection portion 38 is provided integrally with the adjusting portion main body 30. The end of the side connection portion 38 is fixed to the internal pipe 24 in an externally inserted state and is also fixed to the coupling housing 26 in an internally inserted state. The inner hole of the side connection portion 38 communicates the inner hole of the internal pipe 24 and the inner hole of the adjusting portion main body 30.

[0051] An intermediate pipe 40 is provided on the tip side of the flow rate adjusting member 28. The intermediate pipe 40 has a substantially cylindrical shape. By adjusting and setting the length of the intermediate pipe 40 as needed, the length of the burner main body 14 can also be adjusted.

[0052] On the tip side of the intermediate pipe 40, a tip pipe 42 that constitutes the tip side portion of the gas pipe 12 is provided. The tip pipe 42 is a pipe-shaped member having substantially constant inner and outer diameter dimensions. The tip pipe 42 has a base end straight portion 44 and a tip end straight portion 46 that each extend linearly, and a curved portion 48 is provided between the base end straight portion 44 and the tip end straight portion 46. The curved portion 48 is provided in the middle portion in the length direction of the tip pipe 42 and curves in the same direction as the side connection portion 38 in the flow rate adjustment member 28 toward the tip side. By providing the curved portion 48 in the middle of the tip pipe 42, the base end straight portion 44 and the tip end straight portion 46 provided on both sides of the curved portion 48 are relatively inclined. Although the base end side of the burner main body 14 is stepped at the side connection portion 38, as a whole, it is in a longitudinal shape that extends linearly in the left-right direction in FIG. 1, and the tip side portion of the burner main body 14 including the tip nozzle portion 52 is relative to the base end side portion of the burner main body 14 including the coupling portion (coupling housing 26). It is inclined and extends linearly.

[0053] A connecting member 50 is attached to the tip of the tip pipe 42. The connecting member 50 is cylindrical, the base end portion is fixed to the tip end straight portion 46 of the tip pipe 42 in an externally inserted state, and the tip end portion is fixed to the tip nozzle portion 52 in an internally inserted state. The method of fixing the connecting member 50 to the tip pipe 42 and the tip nozzle portion 52 is not particularly limited, but is fixed by means such as a screw structure, press-fitting (fitting), welding, etc.

[0054] The tip nozzle portion 52 constitutes the tip portion of the burner main body 14, is in a substantially cylindrical block shape, and is formed of heat-resistant steel (including iron-based heat-resistant alloys) or heat-resistant alloys such as cobalt-based, nickel-based, and chromium-based alloys. As shown in FIGS. 2 and 3, the tip nozzle portion 52 has a circular internal cavity 54 that extends on the central axis and opens to the base end surface. The internal cavity 54 is connected to the inner hole of the tip conduit 42 via the inner hole of the connecting member 50 and constitutes the tip of the gas conduit 12. Therefore, the gas conduit 12 is continuous from the base end openings of the fuel port 16 and the oxygen port 18 to the internal cavity 54 of the tip nozzle portion 52. The internal cavity 54 does not open to the tip end surface of the tip nozzle portion 52, is in a concave shape that opens toward the base end side, and is not open toward the tip end side. The thickness dimension of the peripheral wall of the internal cavity 54 in the tip nozzle portion 52 is larger than the maximum thickness dimension of the peripheral wall of the gas conduit 12 formed other than the tip nozzle portion 52.

[0055] The tip nozzle portion 52 is provided with a plurality of jet outlets 56 that communicate with the internal cavity 54. The jet outlets 56 are circular holes having a smaller diameter than the internal cavity 54. As shown in FIGS. 2 and 3, the jet outlets 56 are provided through the peripheral wall portion of the internal cavity 54 and open toward the outer periphery on the outer peripheral surface of the tip nozzle portion 52 without opening in the axial direction of the tip nozzle portion 52. In particular, in this embodiment, in the tip nozzle portion 52, there is no jet outlet that opens on the central axis L1, there is no jet outlet that opens on the foremost end surface of the tip nozzle portion 52, and there is no jet outlet having an opening end parallel to the central axis L1.

[0056] That is, the central axis L2 of the jet outlet 56 extends in a radial direction that is substantially orthogonal to the central axis L1 of the tip nozzle portion 52, and the opening direction of the jet outlet 56 is the radial direction of the tip nozzle portion 52. The jet outlets 56 are located at a plurality of circumferential positions on the outer peripheral surface of the tip nozzle portion 52. The jet outlets 56 of this embodiment are located at a plurality of circumferentially spaced positions on the tip nozzle portion 52 and are arranged substantially evenly in the circumferential direction. The opening area of the jet outlet 56 is preferably 1 / 5 or less, more preferably 1 / 10 or less, of the cross-sectional area of the combustion gas flow path (the cross-sectional area of the internal cavity 54) inside the tip nozzle portion 52.

[0057] In the present embodiment, as shown in FIG. 2, at two positions separated from each other in the axial direction of the tip nozzle portion 52 (on two circumferential lines separated from each other by a predetermined distance in the axial direction), the tip-side jet orifice 56a and the base-end-side jet orifice 56b are respectively provided at a plurality of positions on their respective circumferential lines. In the present embodiment, on the circumferential line on the tip side, the jet orifices 56a are located at four positions separated from each other in the circumferential direction of the tip nozzle portion 52, and on the circumferential line on the base-end side, the jet orifices 56b are located at four positions separated from each other in the circumferential direction of the tip nozzle portion 52. The four jet orifices 56a are arranged substantially evenly in the circumferential direction of the tip nozzle portion 52, and the four jet orifices 56b are arranged substantially evenly in the circumferential direction of the tip nozzle portion 52. The eight jet orifices 56 are provided with different phases in the circumferential direction. In the present embodiment, the circumferential phases of the four jet orifices 56a and the four jet orifices 56b are shifted by 45 degrees, so that the eight jet orifices 56 are arranged at different positions in the circumferential direction so as to be substantially even in the circumferential direction, and the eight jet orifices 56 are arranged every 45 degrees in the circumferential direction. That is, the plurality of jet orifices 56a on the circumferential line on the tip side and the plurality of jet orifices 56b on the circumferential line on the base-end side are provided at positions shifted from each other in the circumferential direction so as not to overlap each other in the projection in the central axis direction. The eight jet orifices 56 may have different diameters and cross-sectional shapes from each other, but in order to obtain a certain flame 70 (described later), it is desirable that they be the same as each other.

[0058] A cooling jacket 58 is attached to the burner body 14. The cooling jacket 58 is substantially cylindrical and is externally inserted on the outer peripheral side away from the tip pipe 42. The base end opening is liquid-tightly closed by a sealing member 60, and the tip opening is fixed to the tip nozzle portion 52 in an externally inserted state and is liquid-tightly closed by the tip nozzle portion 52. As a result, a cooling cavity 62 is formed in the cooling jacket 58 so as to surround the periphery of the tip pipe 42. The cooling cavity 62 is fluid-tightly defined with respect to the external space and is provided between the tip pipe 42 and the cooling jacket 58. The cooling cavity 62 is provided over both the tip side portion (tip straight portion 46) and the base end side portion (base end straight portion 44) with respect to the curved portion 48 of the tip pipe 42, and the outer peripheries of both the base end straight portion 44, the curved portion 48, and the tip straight portion 46 are surrounded by the cooling cavity 62. The base end of the cooling cavity 62 does not reach the base end of the tip pipe 42, and the base end straight portion 44 of the tip pipe 42 extends to the base end side beyond the cooling cavity 62. The tip of the cooling cavity 62 reaches the tip nozzle portion 52, and the wall surface on the tip side of the cooling cavity 62 is constituted by the tip nozzle portion 52.

[0059] A water supply pipe 64 is connected to the cooling cavity 62. The tip side of the water supply pipe 64 is inserted into the cooling cavity 62 and opened, and the base end side is connected to a water supply pipe or a water supply tank (not shown) to introduce water as a cooling fluid into the cooling cavity 62. Then, the combustion gas flowing through the gas pipe 12 is cooled by the water flowing through the cooling cavity 62, and the occurrence of backfire in which the combustion gas in the gas pipe 12 ignites can be prevented. The water supply pipe 64 of the present embodiment is provided with a valve for adjusting the flow rate, and the flow rate of the water supplied to the cooling cavity 62 can be adjusted by rotating a third handle 66 connected to the valve. Note that the cooling fluid is not limited to water and may be a liquid other than water or a gas such as air.

[0060] A drain pipe 68 is connected to the cooling cavity 62. The drain pipe 68 of the present embodiment penetrates a part of the cooling jacket 58 and is provided so as to protrude toward the outer periphery. The drain pipe 68 is provided in a constantly communicating state, and the water in the cooling cavity 62 is discharged to the outside through the drain pipe 68. Note that the water discharged from the cooling cavity 62 may be discarded, or for example, it may be guided to the water supply pipe 64 after cooling and circulated.

[0061] In the burner 10 having such a structure, the combustion gas in which the fuel and oxygen supplied from the base end opening of the gas pipe 12 are premixed in the gas pipe 12 is ejected from the ejection port 56 of the tip nozzle portion 52. By igniting the ejected combustion gas, a flame 70 as shown by the alternate long and short dash line in FIGS. 2 and 3 is formed at the ejection port 56. For ease of understanding, in the following description, the flame formed at the ejection port 56a may be distinguished as the flame 70a, and the flame formed at the ejection port 56b may be distinguished as the flame 70b.

[0062] The flame 70 is formed toward the outer periphery, which is the opening direction of the ejection port 56. In the present embodiment, it is formed toward the outer periphery in the radial direction substantially orthogonal to the central axis L1 of the tip nozzle portion 52, and eight flames 70 are formed in a radial pattern that is substantially evenly arranged in the circumferential direction. By operating the first handle 22 for adjusting the supply amount of oxygen and the second handle 36 for adjusting the supply amount of the combustion gas, the ratio of fuel to oxygen in the combustion gas can be adjusted, or the amount of the combustion gas supplied to the tip nozzle portion 52 can be adjusted, whereby the size and combustion efficiency of the flame 70 can be controlled.

[0063] The burner 10 is used, for example, in a process of removing a water tube 76 as a tube body from a drum 74 as a support wall member of a water tube boiler 72 as shown in FIG. 4. As is generally known, the water tube boiler 72 has a structure in which a steam drum and a water drum are communicated by a number of water tubes 76, and water flowing through the water tubes 76 between the steam drum and the water drum is heated in the water tubes 76 to extract steam from the steam drum. Note that the drum 74 may be either a steam drum or a water drum.

[0064] In the water tube boiler 72, the water tube 76 has an open end portion inserted into a mounting hole 78 of the drum 74, and the inserted portion is expanded in diameter so as to be fitted and fixed to the inner surface of the mounting hole 78. Further, the open end portion of the water tube 76 protrudes from the mounting hole 78, and by making the protruding portion into an expanded portion 80 having a tapered shape by expanding the diameter, the water tube 76 is prevented from coming off from the mounting hole 78 (see FIG. 5). However, the drum 74 and the water tube 76 are not fixed in a partially integrated state such as welding, but are mechanically inserted and fixed to each other while maintaining an independent state as separate members. Both the drum 74 and the water tube 76 are formed of a metal material such as iron, and the water tube 76 is allowed to be deformed such as expanded in diameter by an external force or contracted in diameter by thermal contraction.

[0065] In a method of removing a tube body in which the water tube 76 inserted and fixed to the mounting hole 78 of the drum 74 is removed, first, an operator performs a cutting process of cutting the expanded portion 80. The method of cutting the expanded portion 80 is not particularly limited, but for example, it can be cut using a cutting burner. In FIG. 5, the cut expanded portion 80 is virtually shown by a two-dot chain line.

[0066] Next, as shown in FIGS. 5 and 6, the operator inserts the tip nozzle portion 52 of the burner 10 in a state where the flame 70 is formed into the open end portion of the water pipe 76 from which the expanding portion 80 has been removed, and blows the flame 70 onto the open end portion which is the insertion and fixing portion of the water pipe 76 into the mounting hole 78, thereby heating the open end portion of the water pipe 76 simultaneously at a plurality of circumferential locations. Since the flame 70 of the burner 10 is formed to face the outer periphery, the central axis L1 of the tip nozzle portion 52 is oriented substantially parallel to the pipe axis of the water pipe 76, and when the operator inserts the tip nozzle portion 52 into the open end portion of the water pipe 76, the flame 70 can be blown onto the inner peripheral surface of the open end portion of the water pipe 76. The heating temperature of the open end portion of the water pipe 76 by the burner 10 is not particularly limited, but in order to effectively cause the diameter reduction deformation due to thermal shrinkage described later, it is preferably 1000° C. or higher.

[0067] Since the burner 10 forms radially outward flames 70 at a plurality of circumferential locations of the tip nozzle portion 52, the flames 70 are blown onto the water pipe 76 simultaneously at a plurality of circumferential locations. Therefore, the water pipe 76 can be heated simultaneously over a wide circumferential range, and the heating process of heating the entire circumference of the open end portion of the water pipe 76 can be completed in a short working time. In particular, in the present embodiment, since the flames 70 are formed at four locations in the circumferential direction at the same axial position, the water pipe 76 can be heated simultaneously over a wide circumferential range, and the heating over the entire circumference can be efficiently performed.

[0068] Since the burner 10 forms the flame 70a and the flame 70b at two axial locations of the tip nozzle portion 52, as shown in FIG. 5, even when the drum 74 is thick and the length of the mounting hole 78 is long, the insertion and fixing portion of the water pipe 76 into the mounting hole 78 can be heated simultaneously over a wide axial range. Moreover, since the flame 70a and the flame 70b are arranged at positions offset from each other in the circumferential direction and open in different directions from each other, even if the flame 70a and the flame 70b are formed at relatively close positions in the axial direction, they are less likely to interfere with each other and become a single-direction flame or the like, and the wide ranges in the axial direction and the circumferential direction can be heated simultaneously.

[0069] Since the opening area of each jet outlet 56 is sufficiently small, being 1 / 5 or less of the flow path cross-sectional area which is the cross-sectional area of the internal cavity 54, even in a structure where a plurality of jet outlets 56 are connected to one gas pipeline 12, combustion gas is stably supplied to each jet outlet 56 at the required pressure. Therefore, at each jet outlet 56, a stable flame 70 can be obtained, and simultaneous heating at multiple locations of the water pipe 76 can be efficiently realized.

[0070] The tip of the burner 10 is inserted into the opening end portion of the water pipe 76 in such a direction that the central axis L1 of the tip nozzle portion 52 is parallel to the pipe axis of the water pipe 76. Therefore, even when the length of the mounting hole 78 is long and the range of the water pipe 76 to be heated is wide in the pipe axis direction, the tip nozzle portion 52 can be inserted deep to the required position. In particular, since there is no need to insert the burner 10 obliquely, even when the inner diameter of the water pipe 76 is small, the insertion amount of the tip nozzle portion 52 into the water pipe 76 is less likely to be restricted by the interference between the burner 10 and the water pipe 76, and it is possible to cope with a combination of a thinner water pipe 76 and a thick drum 74.

[0071] The tip of the burner 10 inserted into the water pipe 76 is heated by the radiant heat of the flame 70 sprayed on the inner peripheral surface of the water pipe 76, but is continuously cooled by the water circulating in the cooling cavity 62. Therefore, for example, even during continuous use, the occurrence of backfire that ignites the combustion gas in the gas pipeline 12 is prevented. In particular, since the cooling cavity 62 is provided in a wide range in the length direction of the gas pipeline 12 over the tip side and the base end side with respect to the curved portion 48, excellent cooling performance is exhibited. Further, the cooling cavity 62 is provided so as to reach the tip nozzle portion 52, and since the wall surface on the tip side of the cooling cavity 62 is constituted by the tip nozzle portion 52, the tip nozzle portion 52 is efficiently cooled, and backfire is effectively prevented in the internal cavity 54 of the tip nozzle portion 52.

[0072] Particularly in this embodiment, within the cooling cavity 62 extending in the longitudinal direction, the discharge port of the cooling water from the water supply pipe 64 is located at a position a predetermined distance forward from the rear end of the cooling cavity 62 (for example, a position on the tip side rather than the middle part in the longitudinal direction), and opens toward the tip of the cooling cavity 62. Further, in this embodiment, the drain pipe 68 is provided to open at a position close to the proximal end side of the cooling cavity 62 (for example, a position on the proximal end side rather than the discharge port of the water supply pipe 64). As a result, the cooling water discharged from the water supply pipe 64 preferentially flows toward the tip nozzle portion 52 within the cooling cavity 62, and then flows toward the rear side and is discharged from the drain pipe 68, creating a flow pattern within the cooling cavity 62. As a result, the cooling of the tip nozzle portion 52 by the cooling water can be more efficiently and stably achieved.

[0073] Since the open end portion of the water pipe 76 is constrained by the inner surface of the mounting hole 78 in the drum 74 during heating, it is heated in a state where the increase in the outer diameter dimension due to thermal expansion is restricted or prevented.

[0074] After completion of the step of heating the water pipe 76, the operator removes the burner 10 from the water pipe 76 and inserts a cooling device 82 into the water pipe 76 as shown in FIG. 7. The cooling device 82 is a device that ejects a cooling fluid such as air or water from the tip portion at a predetermined pressure to cool the open end portion of the heated water pipe 76. In this embodiment, it is a device that ejects air to air-cool the water pipe 76. The open end portion of the heated water pipe 76 is rapidly cooled, causing the outer diameter dimension to slightly decrease due to thermal contraction, and reducing or eliminating the fixing force of the water pipe 76 with respect to the mounting hole 78 of the drum 74. Then, by removing the water pipe 76 from the mounting hole 78, the operation of removing the water pipe 76 from the drum 74 is completed. Note that the method of removing the water pipe 76 from the drum 74 after cooling is not particularly limited. For example, the water pipe 76 may be pulled out from the inside or outside of the drum 74 for removal, or the water pipe 76 may be pushed in from the inside to the outside or from the outside to the inside of the drum 74 for removal.

[0075] According to the method for removing the water pipe 76 that utilizes the heat shrinkage of the water pipe 76, there is no risk of causing significant damage to the drum 74, as compared with the conventional removal method in which a large load (external force) such as a pressing force is applied to the opening end of the water pipe 76 to deform it. In particular, since dents and scratches on the drum 74 are avoided on the inner surface of the mounting hole 78, which is the connection part of the water pipe 76 to the drum 74, and on the opening peripheral edge, problems such as the formation of a gap due to damage to the drum 74 between the water pipe 76 and the drum 74 after replacement can be avoided.

[0076] Moreover, since it is heating by the flame 70 of the burner 10, a large-scale device such as high-frequency induction heating is not required, and the water pipe 76 can be easily and inexpensively removed from the drum 74. Therefore, the method for removing the pipe body as described above is also easily applicable to the removal of pipes in small-scale boilers where it is difficult to adopt pipe removal by high-frequency induction heating.

[0077] In addition, by using the burner 10 to simultaneously heat the opening end portion of the water pipe 76 at a plurality of locations in the circumferential direction, the time required for the heating process can be significantly shortened, and the removal operation can be completed in a short time. Therefore, the burden on the operator engaged in the removal operation of the water pipe 76 within the narrow drum 74 is reduced, and the deterioration of the working environment due to radiant heat and the like is suppressed.

[0078] FIG. 8 shows a burner 90 for heating a pipe body as a second embodiment of the present invention. The burner 90 is provided with a tip nozzle portion 92. In the following description, for members and parts that are substantially the same as those in the first embodiment, the description will be omitted by attaching the same reference numerals in the drawings.

[0079] The tip nozzle portion 92 has eight ejection ports 56a on the tip side and eight ejection ports 56b on the base end side, respectively. Further, the ejection ports 56a and the ejection ports 56b are arranged in the same phase in the circumferential direction, and the ejection ports 56a and the ejection ports 56b arranged at corresponding positions in the circumferential direction are linearly arranged in the axial direction. As shown in FIG. 9, the ejection ports 56b are evenly arranged in the circumferential direction, and the adjacent ejection ports 56b, 56b in the circumferential direction extend in different radial directions with a relative inclination angle of 45 degrees. The arrangement of the eight ejection ports 56a in the circumferential direction is the same as the arrangement of the eight ejection ports 56b in the circumferential direction shown in FIG. 9.

[0080] According to the burner 90 having such a structure according to the present embodiment, since the number of ejection ports 56 is larger than that of the burner 10 according to the first embodiment, further improvement in the heating efficiency of the pipe body can be achieved. Further, since the interval between the flames 70 in the circumferential direction of the tip nozzle portion 92 is narrowed, when heating the opening end portion of the pipe body over the entire circumference, the rotation operation of the burner 90 can be further omitted.

[0081] For the burner 90, a water supply pipe 94 for supplying a cooling fluid to the cooling cavity 62 extends along the burner body 14 to the base end of the burner body 14. Also, a drain pipe 96 for discharging the cooling fluid from the cooling cavity 62 extends along the burner body 14 to the base end of the burner body 14. Thus, the routing of the water supply pipe 94, the drain pipe 96, and tubes (not shown) connected to these pipes 94, 96 is less likely to affect the operability of the burner 90, and these pipes 94, 96 and tubes are less likely to get in the way of the operator. Further, when attaching / detaching the water supply device to / from the water supply pipe 94 or the drain device to / from the drain pipe 96, since the attachment / detachment portion is located near the operator's hand, the work becomes easier.

[0082] When the water supply pipe 94 and the drain pipe 96 as the cooling fluid pipes are extended to the proximal end side along the burner body 14 in this way, a part of the water supply pipe 94 and a part of the drain pipe 96 may be accommodated in the coupling housing 26. Thereby, in the coupling housing 26 that the operator grips, the water supply pipe 94 and the drain pipe 96 do not get in the way, and the burner 90 can have an outer peripheral shape that is easy to grip in the coupling housing 26. In addition, a holding mechanism such as a hook for holding the water supply pipe 94 and the drain pipe 96 in a position where they do not get in the way may be provided on the burner body 14 instead of or in addition to the accommodation of the pipes 94 and 96 by the coupling housing 26.

[0083] By the way, the inventor prototyped a burner for heating a pipe having a structure according to the present invention as shown in FIGS. 10 and 11, and conducted a heating experiment on the pipe. As a result, a heating process that took about 1 minute and 30 seconds when using a conventional burner in which only one flame is formed at the tip was completed in about 30 seconds with the burner for heating a pipe according to the present invention. Thus, it is also confirmed from the experimental results that the burner for heating a pipe according to the present invention can significantly shorten the time required for the heating process of the pipe compared to the case of using a conventional burner. Moreover, the prototyped burner for heating a pipe according to the present invention was able to heat the entire circumference of the pipe without changing the spraying direction of the flame with respect to the pipe by a rotating operation, so the heating work was easier than that of a conventional burner. In addition, since the prototype of the burner for heating a pipe according to the present invention shown in FIGS. 10 and 11 has a structure similar to the burner 90 for heating a pipe shown in the second embodiment, FIGS. 10 and 11 are given reference numerals corresponding to the second embodiment for easy understanding of the structure.

[0084] As described above, the embodiments of the present invention have been described in detail, but the present invention is not limited by its specific description. For example, the number, size, arrangement, etc. of the ejection ports 56 formed in the tip nozzle portion 52 are not limited. Further, although it is desirable that the plurality of ejection ports 56 are arranged substantially evenly in the circumferential direction of the tip nozzle portion 52, for example, there may be a bias in the arrangement of the ejection ports 56 in the circumferential direction.

[0085] The ejection port 56 desirably opens in the radial direction orthogonally to the central axis L1 of the tip nozzle portion 52, but it may open on the outer peripheral surface of the tip nozzle portion 52 in the intersecting direction with respect to the central axis L1. Note that the opening direction of the ejection port 56 is grasped as the central axis direction at the opening tip to the outside of the ejection port 56. Specifically, for example, the ejection port 56 may be provided so as to incline toward the tip side from the inner periphery to the outer periphery of the tip nozzle portion 52. Thereby, it can also be expected that the flame is less likely to blow out from the pipe body opening toward the operator side during pipe body heating. However, the inclination angle of the central axis L2 of the ejection port 56 with respect to the central axis L1 of the tip nozzle portion 52 is desirably 45 degrees or more and 135 degrees or less, and more preferably 60 degrees or more and 120 degrees or less. Note that the opening direction of the ejection port 56 may be inclined in the circumferential direction. The ejection port 56 is not necessarily limited to a straight line shape, and may be curved or refracted, for example.

[0086] The plurality of ejection ports 56 provided at a plurality of locations in the circumferential direction may be arranged, for example, on one annular outer peripheral line (circumferential direction line) of the tip nozzle portion 52, or may be provided at positions shifted from each other in the length direction (central axis direction) of the tip nozzle portion 52. For example, in an outer peripheral surface region (cylindrical or belt-shaped region) extending over a predetermined region in the length direction of the tip nozzle portion 52, the plurality of ejection ports 56 may be arranged so as to be scattered at different positions in the circumferential direction. More specifically, for example, the plurality of ejection ports 56 may be arranged on one or a plurality of spiral lines extending on the outer peripheral surface of the tip nozzle portion 52, or the plurality of ejection ports 56 may be arranged in a staggered pattern, for example, on a line extending in a sin wave shape in the circumferential direction, or the plurality of ejection ports 56 may be arranged on each annular outer peripheral line (circumferential direction line) spaced apart from each other in the length direction of the tip nozzle portion 52 as described above.

[0087] By being formed in a shape that extends in the circumferential direction with a predetermined length, the ejection ports can also be provided at a plurality of circumferential positions on the outer peripheral surface of the tip nozzle portion 52. In short, the ejection ports are not limited in terms of the number arranged in the axial direction, the number arranged in the circumferential direction, the shape of the opening portion, etc., nor are they limited to a structure in which a plurality of independent ones are provided apart from each other in the circumferential direction of the tip nozzle portion 52. Also, it is possible to bring adjacent ejection ports in the circumferential direction closer to each other until the separation distance therebetween becomes substantially zero. For example, as in the tip nozzle portion 100 shown in FIG. 12, the ejection ports 102 can be continuously provided over the entire circumference on the outer peripheral surface of the tip nozzle portion 100 as a mode in which adjacent ejection ports in the circumferential direction are set closer to each other and made continuous.

[0088] In the second aspect of the present invention, the plurality of ejection ports 56 provided evenly in the circumferential direction of the tip nozzle portion 52 are not interpreted as mathematically strict even positions, but are interpreted within a range sufficient to achieve the operational effects of this aspect. For example, mechanical machining errors are of course allowed, and in cases where there are positions where it is difficult to form the ejection ports 56 due to machining reasons, structural reasons, etc., for some of the corresponding ejection ports 56, a mode in which the position is shifted or the ejection ports 56 at that position are eliminated can also be implemented as one of this aspect. Note that the first aspect of the present invention also includes modes such as a plurality of ejection ports 56 provided at non-uniform intervals in the circumferential direction. Even if the flame is biased in the circumferential direction, while ejecting the flame, the burner is rotated slightly around the central axis (in a circumferential region less than one full rotation, preferably in a circumferential region of half a rotation or less, more preferably in a circumferential region of one-third of a rotation or less) as needed, whereby the tube body can be heated substantially evenly in the circumferential direction from the inner peripheral surface side much more quickly and easily than a single-flame burner of a conventional structure.

[0089] The tip side portion of the burner body 14 may not be provided with the curved portion 48, and the tip side portion of the burner body 14 does not necessarily have to be inclined relative to the base side portion. Also, the relative inclination angle between the tip side portion and the base side portion of the burner body 14 is appropriately set in consideration of the ease of heating work and the like, and is not particularly limited.

[0090] The components of the gas pipeline 12 are merely examples, and the component configuration is not particularly limited as long as it constitutes the gas pipeline 12 reaching the tip nozzle portion 52. For example, it may be constituted by one component. Also, for example, an exhaust mechanism for discharging the combustion gas in the gas pipeline 12 after use can be provided in the middle of the gas pipeline 12.

[0091] The cooling cavity 62 is preferably provided on both the tip side and the base side of the curved portion 48 of the gas pipeline 12. However, for example, it can also be provided only at the tip of the burner 10 so that it is provided on the outer periphery of the tip straight portion 46 and not on the outer periphery of the base straight portion 44.

[0092] When the tip nozzle portion 52 is inserted into the water pipe 76 and heated, a positioning portion for positioning the tip nozzle portion 52 in the radial direction with respect to the water pipe 76 can be provided to easily keep the tip nozzle portion 52 away from the inner peripheral surface of the water pipe 76 over the entire circumference. As the positioning portion, for example, a structure can be adopted in which it protrudes to the outer periphery at the insertion portion of the burner body 14 into the water pipe 76 and abuts against the inner peripheral surface of the water pipe 76 to position and hold the tip nozzle portion 52 and the water pipe 76 in the radial direction. Also, the positioning portion may be, for example, a structure in which it protrudes from the burner body 14 to the outer periphery and is overlapped with the outer peripheral surface of the opening end portion of the water pipe 76 to position and hold the tip nozzle portion 52 and the water pipe 76 in the radial direction.

[0093] In order to prevent the flame from spraying out from the opening of the water pipe 76 toward the operator when the water pipe 76 is heated by the burner 10, a protective structure can also be provided. As the protective structure, for example, it is conceivable to provide an annular plate-shaped protective plate protruding toward the outer periphery at the tip portion of the cooling jacket 58. Thereby, the direction of the flame ejected from the water pipe 76 can be guided to the outer peripheral side by the protective plate, preventing it from spraying out toward the operator. Also, it is possible to utilize the air flow flowing in the direction away from the operator.

[0094] In the above embodiment, a premixed type burner in which a premixed gas in which fuel and oxygen are premixed in the gas pipeline 12 is ejected from the ejection port 56 as combustion gas has been described. However, the present invention can also be applied to a diffusion type burner in which fuel and oxygen are ejected separately from the ejection port 56 and mixed after ejection. Note that the fuel may be a gaseous fuel gas, or may be a liquid and be mixed with oxygen by spraying it in a fine mist state. Also, in order to be able to adjust the flame intensity and the like over a wide range, it is possible to adopt a structure such as a cutting burner.

[0095] The burner according to the present invention is not necessarily used only when removing the water pipe of the water tube boiler, and can be widely applied to the case of simultaneously heating the tube body at a plurality of circumferential locations from the inner circumference. Specifically, for example, the burner according to the present invention can also be used when removing the tube body (boiler tube) in a boiler other than the water tube boiler, and can also be used when heating a tube body such as a ring shape that forms an outer ring or a fitting mounting hole during shrink fitting of a rolling bearing. In addition, the present invention originally includes all of the inventions described in the following (i) to (xi), and the configuration and operation effects thereof are appended. The present invention is (i) A burner for heating a pipe body, wherein the gas ejection ports of the combustion gas at the tip nozzle portion of the burner main body are not opened in the axial direction of the tip nozzle portion, but are located at a plurality of circumferential positions on the outer peripheral surface of the tip nozzle portion and are opened toward the outer periphery. (ii) A plurality of the jet orifices are located at a plurality of positions spaced apart from each other in the circumferential direction of the tip nozzle portion, and the plurality of jet orifices are evenly provided in four or more positions in the circumferential direction of the tip nozzle portion in the circumferential direction of the tip nozzle portion. The burner for heating a tube described in (i). (iii) The burner for heating a tube described in (i) or (ii), wherein the jet orifices are located at a plurality of positions spaced apart from each other in the axial direction of the tip nozzle portion, and each is located at a plurality of positions in the circumferential direction. (iv) The burner for heating a tube described in (iii), wherein the plurality of jet orifices respectively provided on the circumferential lines adjacent to each other in the axial direction of the tip nozzle portion are located at a plurality of positions spaced apart from each other on the respective circumferential lines, and the jet orifices located on each circumferential line are circumferentially displaced from each other so as not to overlap each other in the axial projection. (v) The burner for heating a tube described in any one of (i) to (iv), wherein the jet orifice opens in the radial direction of the tip nozzle portion. (vi) The burner for heating a tube described in any one of (i) to (v), wherein the opening area of the jet orifice is 1 / 5 or less of the cross-sectional area of the flow path of the combustion gas inside the tip nozzle portion. (vii) In the burner body, a block-shaped tip nozzle portion having a thicker peripheral wall than the gas pipe is provided at the tip of the gas pipe through which the premixed combustion gas is guided, and a cooling cavity into which the cooling fluid is guided is formed so as to surround the gas pipe at least at the tip portion of the gas pipe. The burner for heating a tube described in any one of (i) to (vi), wherein the wall portion on the tip side of the cooling cavity is constituted by the tip nozzle portion, so that the cooling cavity reaches the tip nozzle portion. (viii) A curved portion is provided in the middle portion in the length direction of the gas pipe, and the tip side portion of the gas pipe including the tip nozzle portion extends relatively inclined with respect to the base end side portion of the gas pipe that constitutes a joint portion that extends linearly and is gripped by an operator. The cooling cavity is formed over both the base end side portion and the tip side portion including the curved portion. The burner for heating a tube described in (vii). (ix) The coolant pipe through which the coolant flows forms a coupling portion that is housed in the coupling housing together with the gas pipe and is gripped by an operator, for the burner for heating a pipe described in (vii) or (viii). (x) A method for removing a pipe whose open end portion is inserted and fixed into a mounting hole of a support wall member in a boiler, from the support wall member, the method including a heating step of heating the open end portion of the pipe at a plurality of circumferential locations simultaneously by blowing flames against the inner circumferential surface of the open end portion of the pipe inserted and fixed into the mounting hole of the support wall member at a plurality of circumferential locations, a method for removing a pipe in a boiler. (xi) A method for removing a pipe in a boiler according to (x), using the burner for heating a pipe according to any one of (i) to (ix), and in the heating step, inserting the tip nozzle portion of the burner for heating a pipe into the open end portion of the pipe and heating by blowing flames formed from the plurality of ejection ports toward the outer circumference against the inner circumferential surface of the pipe. (including the invention related to). In the invention described in (i) above, since the jet outlets that open toward the outer periphery of the tip nozzle portion are provided at a plurality of locations in the circumferential direction, a plurality of flames formed from the jet outlets toward the outer peripheral side can simultaneously heat a tubular body such as a water pipe used in a boiler, for example, at a plurality of locations in the circumferential direction from the inner peripheral side. Therefore, when it is necessary to heat the tubular body at a plurality of locations in the circumferential direction or over a wide range, the time required for heating the tubular body can be significantly shortened compared to heating by a burner having a conventional structure. Further, in a conventional burner in which only one flame is formed at the tip, in order to heat the tubular body at a plurality of locations in the circumferential direction or over a wide range, it is necessary to rotate and move the burner to change the position where the flame hits the tubular body in the circumferential direction. However, in this aspect, since the plurality of jet outlets are provided so as to be separated from each other in the circumferential direction, the rotation operation of the burner is made easier or unnecessary, and the heating operation becomes easier. Heating the tubular body by the burner does not require large-scale equipment such as high-frequency induction heating and does not require complicated control according to the heating target or the like, so it can be carried out simply and at low cost. Since the flame is formed in the direction toward the outer periphery, when inserting the tip nozzle portion of the burner into the tubular body, it is not necessary to incline the central axis of the tip nozzle portion with respect to the axial direction of the tubular body, and it may be inserted so that the central axis of the tip nozzle portion and the axial direction of the tubular body are substantially parallel. Therefore, the tip nozzle portion can be inserted into a relatively thin tubular body, and it is also possible to insert the tip nozzle portion deeper into the tubular body. In the invention described in (ii) above, since the flames directed toward the outer periphery are formed at four or more locations in the circumferential direction, the tubular body can be simultaneously heated over a wide range in the circumferential direction without rotating the burner significantly. Depending on the number of formed jet outlets, the diameter of the jet outlets (the shape and size of the formed flames), the diameter of the tubular body, etc., for example, it is also possible to simultaneously heat the tubular body over the entire circumference by simply holding it in the insertion direction without rotating the burner. In the invention described in (iii) above, the tube can be simultaneously heated over a wider range in the axial direction by the flames formed at the ejection ports provided at a plurality of positions in the axial direction of the tip nozzle portion. Therefore, even when the portion to be heated in the tube is long in the tube axis direction, the portion to be heated can be heated in a short time without moving the burner significantly in the tube axis direction. In the invention described in (iv) above, the tube can be simultaneously heated at a plurality of positions where the positions in the axial direction and the circumferential direction are different, and the tube can be simultaneously heated over a wider range. In the invention described in (v) above, since the flame formed at the ejection port extends in the radial direction, it becomes easier to spray the flame onto a predetermined position on the inner peripheral surface of the tube, and the tube can be efficiently heated. In the invention described in (vi) above, since the opening area of the ejection port is made sufficiently smaller than the cross-sectional area of the flow path of the combustion gas, even if a plurality of ejection ports are connected to the flow path of the combustion gas in the tip nozzle portion, the necessary combustion gas is supplied to each ejection port at a sufficiently high pressure, and an appropriate flame can be obtained. In the invention described in (vii) above, backfire to the gas pipeline through which the premixed combustion gas is guided is prevented by cooling the gas pipeline with the cooling fluid in the cooling cavity. In particular, since the cooling cavity reaches up to the tip nozzle portion, the tip nozzle portion is cooled, and backfire to the combustion gas into the tip nozzle portion is prevented. In the invention described in (viii) above, the proximal end side portion of the gas pipeline constituting the joint portion held by the operator is inclined with respect to the distal end side portion of the gas pipeline including the tip nozzle portion, so that when the operator performs a heating operation in a narrow working space, the handling of the tube heating burner becomes easier. Since the cooling cavity is provided so as to reach not only the distal end side portion but also the proximal end side portion, the combustion gas up to the tip nozzle portion is sufficiently cooled, and the occurrence of backfire is more effectively prevented. In the invention described in the above (ix), if the joint portion is composed of a gas pipeline and a cooling fluid pipeline that extend independently, the operator has to hold a plurality of pipelines, which makes the operation difficult due to the difficulty of gripping. Therefore, by housing the gas pipeline and the cooling fluid pipeline in the joint housing and integrating them, it becomes easier for the operator to hold the joint portion (joint housing), thereby improving workability. In the invention described in the above (x), in the connection structure of the pipe body to the support wall member in which the open end portion of the pipe body is inserted and fixed into the mounting hole of the support wall member such as a drum, after the heating step of heating the pipe body in a state restrained by the support wall member, the pipe body is cooled and removed from the mounting hole by heat shrinkage, thereby preventing damage to the support wall member accompanying the removal of the pipe body. In particular, it is possible to avoid damage such as cracks or dents at the opening peripheral edge of the mounting hole in the support wall member, prevent a gap due to such damage from occurring between the replaced pipe body and the support wall member, and eliminate the need for repair of the support wall member. Further, since the heating step in the removal operation of the pipe body is performed by blowing a flame, a large-scale device such as high-frequency induction heating and prior preparation are not required, and electrical operation control corresponding to a boiler is also unnecessary. Therefore, it is possible to easily perform the removal of the pipe body by heat shrinkage that can avoid damage to the boiler at low cost. In the heating step, the entire insertion and fixing portion of the pipe body into the mounting hole is heated. Since the pipe body is heated simultaneously at a plurality of circumferential locations by the flame, the pipe body can be heated over the entire circumference in a short time. Therefore, for example, by reducing the heat transfer from the pipe body to the drum, the heating efficiency of the pipe body can be improved and the adverse effect on the drum due to heat transfer can be reduced. Also, for the operator, for example, when the operator enters the narrow drum to work, the working time is shortened, so that the burden on the operator is reduced and the deterioration of the working environment due to the radiant heat of the flame or the like is less likely to become a problem. Since the pipe body is heated simultaneously at a plurality of circumferential locations, the labor of moving the burner and changing the direction of the flame in the circumferential direction of the pipe body is reduced, and the heating operation is simplified. In the invention described in the above (xi), by performing the heating step using the burner for heating the pipe body described in any one of the aspects (i) to (ix), the heating operation time can be shortened and the operation can be facilitated.

Explanation of Symbols

[0096] 10 Burner for heating the pipe body (First Embodiment) 12 Gas pipeline 14 Burner body 16 Fuel port 18 Oxygen port 20 Y-shaped member 22 First handle 24 Internal pipeline 26 Coupling housing 28 Flow regulating member 30 Regulating part body 32 Flow regulating valve 34 Slide shaft 36 Second handle 38 Side connection part 40 Intermediate pipeline 42 Tip pipeline 44 Base straight part 46 Tip straight part 48 Bending part 50 Connecting member 52 Tip nozzle part ) 54 Internal cavity 56 Outlet 58 Cooling jacket 60 Sealing member 62 Cooling cavity 64 Water supply pipeline 66 Third Handle 68 Drain line 70 Flame 72 Water tube boiler (boiler) 74 Drum (support wall member) 76 Water pipe (body) 78 Mounting hole 80 Expansion section 82 Cooling device 90 Tube heating burner (second embodiment) 92 Tip nozzle part 94 Water supply pipe (cooling fluid pipe) 96 Drain pipe (cooling fluid pipe) 100 Tip nozzle portion (another embodiment) 102 spout

Claims

1. A burner for heating a tube body, wherein the gas outlets for combustion gas in the tip nozzle portion of the burner body are provided such that they do not open in the axial direction of the tip nozzle portion, but are located at a plurality of circumferential positions on the outer peripheral surface of the tip nozzle portion and open outwardly, in the burner body, the tip nozzle portion is provided at the tip of a gas pipeline through which premixed combustion gas is guided, and the gas pipeline has a curved portion in the middle of its length direction, a cylindrical cooling jacket that covers the outer periphery of the gas pipeline and forms a cooling cavity on the outer peripheral surface of the gas pipeline extends from the tip nozzle portion toward the base end side, the cooling jacket has a base end side cylindrical portion and a tip end side cylindrical portion that linearly extend from the curved portion of the gas pipeline toward the base end side and the tip end side in the length direction, respectively, and are connected on the outer peripheral side of the curved portion, and the cooling cavity is formed across both the base end side portion and the tip end side portion of the gas pipeline, a water supply pipeline for supplying cooling fluid to the cooling cavity is formed as a straight tubular shape that extends from the base end toward the tip end along the gas pipeline inside the base end side cylindrical portion of the cooling jacket, and the water supply pipeline opens toward the inner peripheral surface of the tip end side cylindrical portion at the tip portion of the base end side cylindrical portion, so that the cooling fluid supplied through the water supply pipeline is discharged toward the inner peripheral surface of the tip end side cylindrical portion, A burner for heating a tube body, in which a drain pipeline for draining the cooling fluid from the cooling cavity is provided in the base end side cylindrical portion.

2. a plurality of the gas outlets are located at a plurality of positions spaced apart from each other in the circumferential direction of the tip nozzle portion, The burner for heating a tube body according to claim 1, wherein the plurality of gas outlets are evenly provided in four or more positions in the circumferential direction of the tip nozzle portion in the circumferential direction of the tip nozzle portion.

3. The burner for heating a tube body according to claim 1 or 2, wherein the gas outlets are located at a plurality of positions spaced apart from each other in the axial direction of the tip nozzle portion and at a plurality of circumferential positions respectively.

4. The burner for heating a tube body according to claim 3, wherein the plurality of gas outlets provided on the circumferential lines adjacent to each other in the axial direction of the tip nozzle portion are located at a plurality of positions spaced apart from each other on each circumferential line, and the gas outlets located on each circumferential line are circumferentially shifted from each other so as not to overlap each other in the axial projection.

5. The burner for heating a tube according to any one of claims 1 to 4, wherein the ejection port opens in the radial direction of the tip nozzle portion.

6. The burner for heating a tube according to any one of claims 1 to 5, wherein the opening area of the ejection port is 1 / 5 or less of the cross-sectional area of the combustion gas flow path inside the tip nozzle portion.

7. A block-shaped tip nozzle portion having a thicker peripheral wall than the gas pipeline is provided at the tip of the gas pipeline, The cooling cavity into which the cooling fluid is introduced is formed so as to surround the gas pipeline at least at the tip portion of the gas pipeline, The burner for heating a tube according to any one of claims 1 to 6, wherein the tip side wall portion of the cooling cavity is constituted by the tip nozzle portion, so that the cooling cavity reaches the tip nozzle portion.

8. The tip side portion of the gas pipeline including the tip nozzle portion extends relatively inclined with respect to the base end side portion of the gas pipeline that constitutes a joint portion that extends linearly and is gripped by an operator. The burner for heating a tube according to claim 7.

9. The burner for heating a tube according to claim 7 or 8, wherein a cooling fluid pipeline through which the cooling fluid flows is housed in a joint housing together with the gas pipeline and constitutes a joint portion that is gripped by an operator.

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