Combustor, boiler, and method for mounting combustor

Abstract

The invention aims to reduce the number of parts and simplify the structure. A burner is provided with: a burner gun (30) that injects fuel; a holder (20) to which the burner gun (30) can be attached and which is capable of reciprocating in the axial direction; a frame body into which the burner gun (30) in a state of being attached to the holder (20) is inserted; a limit switch (19) that determines whether or not the burner gun (30) is inserted into the housing (10); and a push rod (24) that, when the burner gun (30) is inserted into the housing (10), moves from a retracted position in which the switch (19) is not pressed to a pressed position in which the switch (19) is pressed by attaching the burner gun (30) to the holder (20).

Description

Technical Field

[0001] The invention relates to a burner, a boiler and a burner installation method. Background Art

[0002] A boiler that generates steam by burning fuel (for example, fuel oil such as heavy oil or diesel or solid fuel) is provided with a burner that is fixed to the furnace wall of the boiler and injects fuel supplied from the outside of the boiler into the furnace of the boiler. This burner includes: a burner gun that injects fuel; a frame in which the burner gun is inserted; and a bracket that is supported by the frame and on which the burner gun is mounted. The burner gun is appropriately inserted into the frame so that the front end of the burner gun that injects fuel is located in the furnace.

[0003] If the burner gun is not properly mounted on the bracket, a problem such as fuel leakage may occur. Therefore, it is known to provide a limit switch for confirming whether the burner gun is mounted on the bracket (for example, Patent Document 1).

[0004] Previous technical literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 63-297913 Summary of the invention

[0007] Technical issues to be solved by the invention

[0008] The burner gun mounted on the bracket is inserted into the frame properly so that the front end is located in the furnace. Therefore, if the burner gun is not properly inserted into the frame, the fuel may not be sprayed into the furnace. Therefore, in addition to the limit switch for confirming whether the burner gun is mounted on the bracket, it is also possible to provide a limit switch for confirming whether the burner gun is properly inserted into the frame.

[0009] However, when both the installation confirmation limit switch and the insertion confirmation limit switch are provided, the number of parts may increase and the structure may become complicated.

[0010] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a burner and a boiler, and a burner mounting method, which can reduce the number of parts and simplify the structure.

[0011] Means for solving technical problems

[0012] In order to solve the above-mentioned problems, a burner, a boiler, and a burner mounting method of the present invention adopt the following aspects.

[0013] A burner according to one embodiment of the present invention comprises: a burner gun for spraying fuel; a bracket for loading and unloading the burner gun and being reciprocatingly movable along the axial direction; a frame for inserting the burner gun mounted on the bracket; a switch for determining whether the burner gun is inserted into the frame; and a push rod, by mounting the burner gun on the bracket, the front end of which moves from a retreat position in which the switch is not pressed to a pressing position in which the switch is pressed when the burner gun is inserted into the frame.

[0014] The burner installation method involved in one aspect of the present invention comprises: an installation step of installing a burner gun that sprays fuel on a bracket on which the burner gun is detachably mounted; an insertion step of inserting the burner gun installed on the bracket into a frame; and a step of judging whether the burner gun has been inserted into the frame by a switch, the installation step comprising a push rod moving step, in which the front end of a push rod provided on the bracket is moved from a retreat position in which the switch is not pressed to a pressing position in which the switch is pressed when the burner gun is inserted into the frame, and the insertion step comprising a pressing step, in which the switch is pressed by the front end of the push rod.

[0015] Effects of the Invention

[0016] According to the present invention, the number of parts can be reduced and the structure can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram showing a burner according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 An enlarged view of the main part (Part II).

[0019] Figure 3 It is a schematic diagram showing a burner according to an embodiment of the present invention.

[0020] Figure 4 yes Figure 3 An enlarged view of the main part (part IV).

[0021] Figure 5 It is a schematic diagram showing a burner according to an embodiment of the present invention.

[0022] Figure 6 yes Figure 5 An enlarged view of the main part (part VI). DETAILED DESCRIPTION

[0023] Below, reference Figures 1 to 6, an embodiment of a burner, a boiler, and a burner installation method according to the present invention is described. In addition, in the following description, the end on the side where fuel is injected (the left side of the drawing) is referred to as the "front end", and the end on the opposite side (the right side of the drawing) is referred to as the "base end".

[0024] like Figure 1 As shown, the boiler 1 includes, for example, a furnace 2 having a furnace wall 3 extending in a cylindrical shape in the vertical up-down direction and forming flames inside; and a plurality of burners 5 provided on the furnace wall 3. The furnace 2 has a rectangular cross section when cut on a horizontal plane. In the boiler 1, fuel oil such as diesel and heavy oil is atomized by gas (spray medium) composed of air or steam and sprayed from the burner 5 into the furnace 2, and the sprayed fuel oil is burned in the furnace 2. In addition, the burner 5 is not limited to a two-fluid spray method using a spray medium, and for example, a pressure spray method that atomizes by the supply pressure of the fuel oil may also be used.

[0025] like Figure 1 and Figure 5 As shown, the burner 5 comprises: a frame 10 fixed to the furnace wall 3; a bracket 20 mounted on the frame 10; a burner gun 30 mounted on the bracket 20; and an insertion and extraction device 40 to move the bracket 20. In addition, Figure 1 This is a state where the burner gun 30 is not mounted on the bracket 20 .

[0026] The frame 10 includes a cylindrical inner tube 11 extending along the central axis C, and a duct-shaped outer tube 12 extending along the central axis C and covering the inner tube 11 from the radially outer side. In the flow path formed between the inner tube 11 and the outer tube 12, combustion air supplied from a wind box (not shown) flows and is injected into the furnace 2 through a burner nozzle 16 described later.

[0027] The outer peripheral surface of the front end of the outer tube 12 is fixed to the furnace wall 3. In addition, the base end of the outer tube 12 is fixed to the outer plate 4 covering the furnace wall 3 from the outside via a fixing member 13. The fixing member 13 includes: a cylindrical portion fixed to the inner peripheral surface of the base end of the outer tube 12; and an annular portion extending inward from the base end of the cylindrical portion and fixed to the outer plate 4.

[0028] The opening formed at the base end side of the outer tube 12 is closed by the annular portion of the fixing member 13 and the closing member 14. The closing member 14 is an annular member fixed to the inner end of the annular portion and extending further inward from the inner end.

[0029] The front end of the inner tube 11 is opened toward the furnace 2. The front end of the inner tube 11 is disposed near the furnace wall 3. An injection nozzle 33 of a burner gun 30 described later is disposed inside the front end of the inner tube 11 (see Figure 5). A burner nozzle 16 for preventing diffusion of combustion air supplied toward the flame generated by ignition of the fuel oil is provided on the outer peripheral side of the inner tube 11. The burner nozzle 16 is located closer to the outer plate 4 than the furnace wall 3.

[0030] An annular flange portion 15 extending radially outward is provided at the base end portion of the inner tube 11 . The flange portion 15 is fixed to the closing member 14 .

[0031] The frame 10 has a base 17 disposed on the base end side of the flange 15. The base 17 is formed with a through hole on the central axis C. The through hole is connected to the inner cylinder 11. The cylinder 21 of the bracket 20 described later is inserted into the through hole. In addition, the cylinder 41 of the plug-in device 40 is fixed to the base 17 at a position offset from the central axis C in the radial direction outward.

[0032] A limit switch (switch) 19 is mounted on the base 17 of the frame 10 at a position offset radially outward from the central axis C. The limit switch 19 is connected to a control device (not shown) via a cable (not shown). The limit switch 19 is fixed to the base 17 of the frame 10 via a bracket 18 extending toward the base end side in the axial direction.

[0033] The controller (Controller) includes, for example, a CPU (Central Processing Unit: processor), a main memory, a secondary storage (memory), etc. Furthermore, the controller may include a communication unit for transmitting and receiving information with other devices.

[0034] The main storage device is composed of a writable memory such as a cache memory or a RAM (Random Access Memory), and is used as a work area for reading execution programs of the CPU and writing processing data based on the execution programs.

[0035] The secondary storage device is a non-transitory computer-readable storage medium, such as a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, etc.

[0036] As an example, a series of processes for realizing various functions are stored in a secondary storage device in the form of a program, and the CPU reads the program into a primary storage device and executes information processing / calculation processing to realize various functions. In addition, the program can also be applied in a manner of being pre-installed in a secondary storage device, or provided in a state of being stored in a computer-readable storage medium, or transmitted via a wired or wireless communication means, etc. Computer-readable storage media refers to magnetic disks, optical magnetic disks, CD-ROMs, DVD-ROMs, semiconductor memories, etc.

[0037] The limit switch 19 determines whether the burner gun 30 is inserted into the frame 10. The limit switch 19 has a lever 19a (refer to Figure 2 ). The lever 19a is not pressed (refer to Figure 2 ) is set to the OFF state, and the lever 19a is pressed toward the front end direction (reference Figure 6 ) is set to the ON state. For example, when the limit switch 19 is in the OFF state, the control device determines that the burner gun 30 is not inserted into the frame 10. Furthermore, when the limit switch 19 is in the ON state, the control device determines that the burner gun 30 is inserted into the frame 10.

[0038] The holder 20 is relatively movable with respect to the frame 10 in the direction extending along the central axis C. The holder 20 includes a cylinder 21 inserted into the inner cylinder 11 and a holder-side mounting portion 22 provided on the proximal side of the cylinder 21 and having the burner gun 30 mounted thereon.

[0039] A through hole extending in the axial direction is formed inside the bracket-side mounting portion 22, and the through hole communicates with the cylindrical portion 21. A burner gun 30 described later is inserted through the through hole.

[0040] A rod insertion portion 23 is fixed to the bracket-side mounting portion 22 at a position offset radially outward from the central axis C. The rod insertion portion 23 is a cylindrical member extending in the axial direction. A push rod 24 is inserted into the rod insertion portion 23 .

[0041] The push rod 24 is a long strip-shaped component and extends along the central axis C. Figure 2 As shown, the base end of the push rod 24 protrudes from the rod penetration portion 23 by a predetermined length. In the following description, the protruding portion is referred to as a protruding portion 24c. A plate-shaped pressing portion 24a is provided at the front end of the push rod 24. In addition, a locking portion 24b protruding over the entire circumferential area is provided on the outer peripheral surface of the push rod 24. The push rod 24 is subjected to force in the base end direction, but is locked to the bracket 25 fixed to the bracket side mounting portion 22 by the locking portion 24b, thereby maintaining a predetermined position.

[0042] The pressing portion 24a of the push rod 24 is arranged to overlap with the lever 19a of the limit switch 19 when viewed from the direction along the central axis C (hereinafter, sometimes referred to as "axial direction"). In other words, the pressing portion 24a and the lever 19a are opposite. That is, the push rod 24 can press the lever 19a of the limit switch 19 by moving along the axial direction.

[0043] Regarding the push rod 24, when the burner gun 30 is not mounted on the bracket 20 ( Figure 2 In the state shown in FIG. 1 , the protrusion 24c protrudes from the bracket side mounting portion 22 by a predetermined length, and the pressing portion 24a is located at a position (retracted position) where the lever 19a of the limit switch 19 is not pressed. Furthermore, the locking portion 24b is pressed against the bracket 25 from the front end side by applying force.

[0044] Regarding the push rod 24, when the burner gun 30 is mounted on the bracket 20 ( Figure 4 In the state shown in FIG. 1 , the protrusion 24c is pressed toward the front end. Accordingly, if the bracket 20 is axially slid by the plug-in device 40, the pressing portion 24a is located at a position (pressing position) that presses the lever 19a of the limit switch 19. Furthermore, the locking portion 24b is located at a position separated from the bracket 25.

[0045] The bracket 20 has a linkage portion 26 that moves in conjunction with the piston rod 42 of the plug-in device 40. The linkage portion 26 is fixed to the bracket-side mounting portion 22. The bracket 20 is reciprocated in the axial direction by the plug-in device 40.

[0046] Furthermore, a clamp member 29 described later is provided on the bracket-side mounting portion 22 of the bracket 20 .

[0047] like Figure 3 and Figure 5 As shown, the burner gun 30 includes: a fuel pipe 31 inserted through the inner tube 11 and the bracket side mounting portion 22; a spray medium pipe (not shown) extending in parallel with the fuel pipe 31; and a burner gun side mounting portion 32 provided at the base end of the fuel pipe 31 and mounted on the bracket 20. Figure 3 and Figure 5 In the figure, the spray medium pipe is omitted for illustration.

[0048] Inside the bracket 20, there are provided: a fuel supply pipe (not shown) through which the fuel guided from the fuel supply device (not shown) flows; and a spray medium supply pipe (not shown) through which the spray medium guided from the spray medium supply device (not shown) flows. By appropriately mounting the burner gun 30 on the bracket 20, the fuel pipe 31 of the burner gun 30 is connected to the fuel supply pipe of the bracket 20, and the spray medium pipe (not shown) of the burner gun 30 is connected to the spray medium supply pipe of the bracket 20. In addition, the fuel supply pipe and the spray medium supply pipe are provided with a fuel valve (not shown) and a spray medium valve (not shown) that switch whether to supply fuel and spray medium to the burner gun by switching between an open state and a closed state. The fuel valve and the spray medium valve are controlled by a control device. The control device allows the fuel valve and the spray medium valve to be set to an open state when the limit switch 19 is in an on state, and does not allow the fuel valve and the spray medium valve to be set to an open state when the limit switch 19 is in an off state.

[0049] When the burner gun 30 is mounted on the bracket 20, the fuel pipe 31 is a cylindrical component with the central axis C as the central axis. The fuel pipe 31 extends in the axial direction. Fuel oil or gas, etc. circulates in the fuel pipe 31. A spray nozzle 33 for spraying fuel oil or gas, etc. into the furnace 2 is provided at the front end of the fuel pipe 31. The spray medium pipe (not shown) extends in the axial direction. The spray medium pipe has a spray medium circulated in the inside. The spray medium pipe has a spray nozzle 33 provided at the front end. The spray nozzle 33 sprays the fuel and spray medium guided by the fuel pipe 31 and the spray medium pipe.

[0050] The burner gun side mounting part 32 contacts the base end of the bracket side mounting part 22 from the base end side. The burner gun side mounting part 32 has a fixing part 32a at a position radially offset outward from the central axis C. The fixing part 32a is fixed to the bracket 20 by the clamp member 29.

[0051] The burner gun 30 is mounted on the bracket 20 by the clamping member 29. The clamping member 29 is, for example, substantially U-shaped in a plan view, and the front end portion 29a is connected to the bracket 20. The clamping member 29 is locked to the burner gun side mounting portion 32 (more specifically, the fixing portion 32a) of the burner gun 30 while the burner gun side mounting portion 32 of the burner gun 30 is in contact with the bracket side mounting portion 22 of the bracket 20, and the fastening bolt 29c provided at the base end portion 29b is fastened. Thus, the burner gun side mounting portion 32 of the burner gun 30 is pressed toward the bracket 20 relative to the base end portion 29b, thereby restricting the relative movement between the burner gun 30 and the bracket 20. In this way, by using the clamping member 29, the burner gun 30 can be easily mounted on the bracket 20.

[0052] When the fastening bolt 29c of the clamp member 29 is loosened, the base end portion 29b is separated from the burner gun side mounting portion 32 of the burner gun 30. Then, the clamp member 29 is rotated around the front end portion 29a. Thus, the base end portion 29b and the burner gun 30 can be released from the locking. Thus, the burner gun 30 can be easily removed from the bracket 20.

[0053] The burner gun side mounting portion 32 has a protrusion portion 32 b that protrudes further outward from the radially outer end portion of the fixing portion 32 a .

[0054] The protrusion 32b is a plate-shaped member. The protrusion 32b is provided so as to overlap with the protrusion 24c of the push rod 24 when viewed from the axial direction. In other words, the protrusion 32b is opposite to the protrusion 24c. The protrusion 32b presses the protrusion 24c in the axial direction when the burner gun 30 is mounted on the bracket 20.

[0055] The burner gun 30 is inserted into the frame 10 in a state of being mounted on the bracket 20 .

[0056] like Figure 1 As shown in FIGS. 1 and 2 , the plugging and unplugging device 40 includes a cylinder portion 41 fixed to the frame 10 and a piston rod 42 that moves relative to the cylinder portion 41 in the axial direction. The piston rod 42 is fixed to the bracket 20 .

[0057] The insertion and extraction device 40 inserts and extracts the burner gun 30 attached to the bracket 20 into and from the frame 10 by moving the piston rod 42 in the axial direction relative to the cylinder portion 41 .

[0058] Next, use Figures 1 to 6 , the installation method of the burner 5 is described. In addition, Figure 1 and Figure 2 The figure shows a state where the burner gun 30 is not mounted on the bracket 20 and the burner gun 30 is not inserted into the frame 10. Figure 3 and Figure 4 The burner gun 30 is shown in the figure in a state where it is mounted on the bracket 20 and the burner gun 30 is inserted to a midway position of the frame 10. Figure 5 and Figure 6 The figure shows a state in which the burner gun 30 is attached to the bracket 20 and the burner gun 30 is completely inserted into the frame 10 .

[0059] First, if Figure 1 As shown, the frame 10 is fixed to the furnace wall 3, and the bracket 20 is installed on the frame 10. Figure 1 In this state, the burner gun 30 is not mounted on the bracket 20 and is not inserted into the frame 10. Figure 2As shown, the protrusion 24c of the push rod 24 is not pressed by the protrusion 32b of the burner gun 30. Therefore, the push rod 24 is in a state where a force is applied in a direction away from the furnace wall 3 (base end side). As a result, the pressing portion 24a provided at the front end of the push rod 24 is located at a position (retracted position) that does not contact the lever 19a of the limit switch 19. The bracket 20 can be reciprocated in the axial direction by the plug-in device 40, but when the pressing portion 24a is in the retracted position, even when the bracket 20 is in a state where it is located closest to the furnace wall 3 (front end side) ( Figure 1 and Figure 2 In the state shown in the figure), the pressing portion 24a and the lever 19a of the limit switch 19 are also separated.

[0060] Then, if Figure 3 and Figure 4 As shown, the burner gun 30 is mounted on the bracket 20 (mounting process). When the burner gun 30 is mounted on the bracket 20, first, the bracket 20 is slid and moved in a direction away from the furnace wall 3 by the plug-in device 40. In this state, the burner gun 30 is mounted on the bracket 20. In detail, the bracket side mounting portion 22 of the bracket 20 is brought into contact with the burner gun side mounting portion 32 of the burner gun 30. At this time, the protrusion 32b of the burner gun side mounting portion 32 presses the protrusion 24c of the push rod 24. As a result, the pressing portion 24a provided at the front end of the push rod 24 moves from a position (retracted position) that does not contact the lever 19a of the limit switch 19 to a pressing position that can press the lever 19a of the limit switch 19 if the bracket 20 is axially slid by the plug-in device 40 (push rod moving process). Next, the bracket 20 and the burner gun 30 are fixed by the clamping member 29.

[0061] Then, if Figure 5 and Figure 6 As shown, the burner gun 30 mounted on the bracket 20 is inserted into the frame 10 (insertion process). Specifically, the bracket 20 is slid and moved toward the direction (front end side) close to the furnace wall 3 by the insertion and extraction device 40. As a result, the burner gun 30 mounted on the bracket 20 is also moved.

[0062] When the burner gun 30 is moved to a predetermined position, the pressing portion 24a of the push rod 24 presses the lever 19a of the limit switch 19 (pressing step). As a result, the limit switch 19 changes from an OFF state to an ON state.

[0063] When the limit switch 19 is turned on, the control device determines that the burner gun 30 is properly inserted (determination step). Accordingly, the control device determines that the fuel valve and the spray medium valve can be opened.

[0064] In this way, the burner 5 is mounted on the furnace wall 3. When the burner 5 is removed from the furnace wall 3, the procedure is reversed.

[0065] According to this embodiment, the following effects are achieved.

[0066] In the present embodiment, the push rod 24 is provided, which is reciprocable in the axial direction through the bracket 20, and the burner gun 30 is mounted on the bracket 20, and the pressing portion 24a is moved from the retreat position where the limit switch 19 is not pressed to the pressing position where the limit switch 19 can be pressed when the burner gun 30 is inserted into the frame 10. Thus, when the burner gun 30 is mounted on the bracket 20 (the push rod 24 is at the pressing position), the limit switch 19 is pressed when the burner gun 30 is inserted into the frame 10. On the other hand, when the burner gun 30 is not mounted on the bracket 20 (the push rod 24 is at the retreat position), the limit switch 19 is not pressed even if the burner gun 30 is inserted into the frame 10. Therefore, when the burner gun 30 is mounted on the bracket 20 and the burner gun 30 is inserted into the frame 10, the limit switch 19 is pressed by the push rod 24.

[0067] Therefore, the installation and insertion of the burner gun 30 can be confirmed by one limit switch 19. Thus, the number of limit switches can be reduced compared to, for example, a case where a limit switch for installation confirmation that confirms the installation of the burner gun 30 and a limit switch for insertion confirmation that confirms the insertion are provided separately. Therefore, the number of parts can be reduced and the structure can be simplified. Therefore, the cost can be reduced.

[0068] Furthermore, in this embodiment, when the control device determines that the burner gun 30 is properly inserted, it determines that the fuel valve can be opened. Thus, fuel can be supplied to the burner gun 30 while the burner gun 30 is inserted into the frame 10. Therefore, safety can be improved.

[0069] In addition, the present invention is not limited to the above-mentioned embodiment, and can be modified appropriately within the scope not departing from the gist of the present invention.

[0070] For example, in the above-mentioned embodiment, the example of application to a burner that injects fuel oil is described, but the present invention is not limited thereto. For example, it can be applied to a burner that injects solid fuel such as pulverized coal or gas fuel.

[0071] Furthermore, in the above-mentioned embodiment, an example of application to a burner installed in a boiler is described, but the present invention is not limited thereto, and may be applied to a burner installed in a flame-forming device other than a boiler such as an industrial furnace.

[0072] The burner, the boiler, and the burner installation method described in the above-described embodiment can be understood, for example, as follows.

[0073] The burner 5 involved in the first embodiment of the present invention comprises: a burner gun 30 that sprays fuel; a bracket 20 that can load and unload the burner gun 30 and can reciprocate along the axial direction; a frame 10 for inserting the burner gun 30 installed in the bracket 20; a limit switch 19 that determines whether the burner gun 30 is inserted into the frame 10; and a push rod 24, by installing the burner gun 30 on the bracket 20, when the burner gun 30 is inserted into the frame 10, the front end 24a moves from a retreat position where the switch 19 is not pressed to a pressing position where the switch 19 is pressed.

[0074] In the above structure, a push rod is provided, and the push rod moves the front end from the retreat position where the switch is not pressed to the pressing position where the switch can be pressed when the burner gun is inserted into the frame by installing the burner gun on the bracket. Thus, when the burner gun is installed on the bracket (the push rod is in the pressing position), the switch is pressed when the burner gun is inserted into the frame. On the other hand, when the burner gun is not installed on the bracket (the push rod is in the retreat position), the switch is not pressed even if the burner gun is inserted into the frame. Therefore, when the burner gun is installed on the bracket and the burner gun is inserted into the frame, the switch is pressed by the push rod.

[0075] Therefore, the installation and insertion of the burner gun can be confirmed by one switch. Thus, the number of switches can be reduced compared to, for example, a switch for confirming the installation of the burner gun and a switch for confirming the insertion are provided separately. Therefore, the number of parts can be reduced and the structure can be simplified. Therefore, the cost can be reduced.

[0076] The burner 5 involved in the second embodiment of the present invention is provided with a fuel valve in the above-mentioned first embodiment, and the fuel valve switches whether to supply fuel to the burner gun 30 by switching between an open state and a closed state. When the switch 19 is in a pressed state, the fuel valve is allowed to be set to an open state.

[0077] In the above configuration, fuel can be supplied to the burner gun in a state where the burner gun is inserted into the frame.

[0078] A boiler 1 according to a first aspect of the present invention includes any one of the burners 5 described above.

[0079] The installation method of the burner 5 involved in the first embodiment of the present invention includes: an installation process, installing a burner gun 30 that sprays fuel on a bracket 20 on which the burner gun 30 is detachably installed; an insertion process, inserting the burner gun 30 installed on the bracket 20 into the frame 10; and a judgment process, judging whether the burner gun 30 has been inserted into the frame 10 by means of a switch 19, the installation process including a push rod moving process, in which the front end 24a of the push rod 24 provided on the bracket 20 is moved from a retreat position in which the switch 19 is not pressed to a pressing position in which the switch 19 is pressed when the burner gun 30 is inserted into the frame 10, and the insertion process including a pressing process, in which the switch 19 is pressed by the front end 24a of the push rod 24.

[0080] Explanation of symbols

[0081] 1- boiler, 2- furnace, 3- furnace wall, 4- outer plate, 5- burner, 10- frame, 11- inner tube, 12- outer tube, 13- fixing member, 14- closing member, 15- flange, 16- burner nozzle, 17- base, 18- bracket, 19- limit switch (switch), 19a- lever, 20- bracket, 21- tube, 22- bracket side mounting portion, 23- rod penetration portion, 24- push rod, 24 a-pressing portion, 24b-locking portion, 24c-protrusion, 25-bracket, 26-linkage portion, 29-clamping component, 29a-front end portion, 29b-base end portion, 29c-fastening bolt, 30-burner gun, 31-fuel pipe, 32-burner gun side mounting portion, 32a-fixing portion, 32b-protrusion, 33-injection nozzle, 40-plug-in device, 41-cylinder body, 42-piston rod, C-center axis.

Claims

1. A burner comprising: burner guns, which inject fuel; A bracket, which can load and unload the burner gun and can reciprocate along the axial direction; a frame into which the burner gun mounted on the bracket is inserted; a switch to determine whether the burner gun is inserted into the frame; and The push rod is installed on the bracket so that when the burner gun is inserted into the frame, the front end of the push rod moves from a retreat position where the switch is not pressed to a pressing position where the switch is pressed.

2. The burner according to claim 1, comprising a fuel valve, wherein the fuel valve switches between an open state and a closed state to switch whether fuel is supplied to the burner gun. When the switch is in a pressed state, the fuel valve is allowed to be in an open state.

3. A boiler comprising the burner according to claim 1 or 2.

4. A burner installation method, comprising: An installation step of installing a burner gun for spraying fuel on a bracket for detachably mounting the burner gun; An inserting step of inserting the burner gun mounted on the bracket into a frame; and A judging step, judging by a switch whether the burner gun has been inserted into the frame, The installation step includes a push rod moving step in which a front end of a push rod provided on the bracket is moved from a retreat position in which the switch is not pressed to a pressing position in which the switch is pressed when the burner gun is inserted into the frame. The inserting step includes a pressing step in which the switch is pressed by the front end of the push rod.

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