Method for removing burners, boilers, and burner guns

Abstract

To prevent a situation where gas in a furnace leaks outside when extracting a burner gun.SOLUTION: A burner 5 comprises a burner gun 30 for ejecting fuel, an inner cylinder for the burner gun 30 to be inserted thereinto, extending in the axial direction to connect the inner space of a furnace and the outer space of the furnace, and a compressed air feeder 50 for feeding compressed air into the inner cylinder. The compressed air feeder 50 comprises a compressed air valve 52 for switching an open state of feeding compressed air into the inner cylinder and a close state of not feeding compressed air thereinto. The compressed air valve 52 comprises a lever 53 moving between the open position and the close position, and a lever lock-pin 54 for switching a state of restricting and a state of allowing the movement of the lever 53, and a burner gun lock-pin 55 for restricting the movement of the burner gun 30 in the axial direction when the lever 53 is in a state of being on a close position and allowing the movement of the burner gun 30 in the axial direction when the burner gun 53 is in a state of being on an open position.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a burner, a boiler, and a method for removing a burner gun.

Background Art

[0002] A boiler that generates steam by burning fuel includes a burner that is fixed to a furnace wall or the like of the boiler and injects fuel supplied from outside the boiler into the furnace of the boiler. The burner has a burner gun that injects fuel and a main body portion that is fixed to the boiler and into which the burner gun is inserted. When the burner gun is appropriately inserted into the main body portion, the tip portion that injects fuel is located inside the furnace.

[0003] Such a burner may require the burner gun to be removed from the main body portion during maintenance or the like. For this reason, a burner having a configuration in which the burner gun and the main body portion can be removed is known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The tip portion of the burner gun is located inside the furnace. Therefore, the through hole formed in the main body portion into which the burner gun is inserted communicates the internal space of the furnace and the external space of the furnace. Thus, when removing the burner gun, there is a possibility that high-temperature gas in the furnace leaks through the through hole. This phenomenon can occur even in a negative-pressure furnace where the pressure inside the furnace is lower than atmospheric pressure due to temporary pressure fluctuations or the like inside the furnace. To suppress gas leakage, when removing the burner gun, it is conceivable to supply a leakage-suppressing gas (e.g., compressed air) to the through-hole, thereby obstructing the flow of high-temperature gas through the through-hole from the internal space of the furnace to the external space. In this case, the supply and cessation of the leakage-suppressing gas can be controlled by manually operating a valve installed in the leakage-suppressing gas supply system. However, in such cases, when removing the burner gun, there was a possibility that the leakage-suppressing gas would not be supplied due to reasons such as forgetting to open the valve, resulting in leakage of high-temperature gas from inside the furnace.

[0006] This disclosure has been made in view of these circumstances and aims to provide a burner and boiler, as well as a method for removing a burner gun, that can make it less likely for gas to leak from inside the furnace when the burner gun is removed. [Means for solving the problem]

[0007] To solve the above problems, the burner, boiler, and burner gun removal method of this disclosure employs the following means. A burner according to one aspect of the present disclosure is a burner provided on the furnace wall defining a furnace into which combustion gas is generated, comprising: a burner gun for injecting fuel; a cylindrical portion connecting the internal space of the furnace and the external space of the furnace, into which the burner gun is inserted and which extends in a predetermined direction; and a gas supply portion for supplying gas into the cylindrical portion, wherein the gas supply portion has a valve portion for switching between an open state for supplying gas into the cylindrical portion and a closed state for not supplying gas, the valve portion having a lever for moving between an open position for the open state and a closed position for the closed state, a lever lock portion for switching between a state that restricts the movement of the lever and a state that allows the movement of the lever, and a burner gun lock portion that restricts the relative movement of the burner gun with respect to the cylindrical portion in the predetermined direction when the lever is in the closed position, and allows the relative movement of the burner gun with respect to the cylindrical portion in the predetermined direction when the lever is in the open position.

[0008] A method for removing a burner gun according to one aspect of the present disclosure is a method for removing a burner gun in a burner provided in the furnace wall defining a furnace into which combustion gas is generated, wherein the burner comprises a burner gun for injecting fuel, a cylindrical portion connecting the internal space of the furnace and the external space of the furnace, into which the burner gun is inserted and which extends in a predetermined direction, and a gas supply portion for supplying gas into the cylindrical portion, the gas supply portion having a valve portion for switching between an open state for supplying gas into the cylindrical portion and a closed state for not supplying gas, and the valve portion moving between an open position for the open state and a closed position for the closed state The device comprises a lever, a lever locking section for switching between a state that restricts the movement of the lever and a state that allows the movement of the lever, and a burner gun locking section that restricts the relative movement of the burner gun with respect to the cylinder in a predetermined direction when the lever is in the closed position, and allows the relative movement of the burner gun with respect to the cylinder in a predetermined direction when the lever is in the open position, and includes a switching step for switching the lever locking section from the restricting state to the allowing state, a lever moving step for moving the lever from the closed position to the open position, and a removal step for removing the burner gun from the cylinder. [Effects of the Invention]

[0009] According to this disclosure, it is possible to make it less likely for gas to leak from inside the furnace when the burner gun is removed. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing a burner according to an embodiment of the present disclosure. [Figure 2] This is a top view showing the main parts of a burner according to the present disclosure, with the compressed air valve in a fully closed position. [Figure 3] This is a side view of Figure 2. [Figure 4] This is a front view of Figure 2. [Figure 5] This is a top view showing the main parts of a burner according to the present disclosure, with the compressed air valve in an intermediate opening position. [Figure 6]This is a side view of Figure 5. [Figure 7] Figure 5 is a front view. [Figure 8] This is a top view showing the main parts of a burner according to the present disclosure, with the compressed air valve in a fully open position. [Figure 9] This is a side view of Figure 8. [Figure 10] This is a front view of Figure 8. [Modes for carrying out the invention]

[0011] Below, an embodiment of the burner, boiler, and burner mounting method according to this disclosure will be described with reference to Figures 1 to 10. In the following description, in Figure 1, the end of the boiler 1 on the inside of the furnace 2 (lower side of the drawing), which is the side from which the fuel is injected, will be referred to as the "tip," and the end on the opposite side, the outside space side of the furnace 2 (upper side of the drawing), will be referred to as the "base."

[0012] As shown in Figure 1, the boiler 1 comprises a furnace 2 having a cylindrical furnace wall 3 extending vertically, in which a flame is formed, and a plurality of burners 5 provided on the furnace wall 3. In such a boiler 1, liquid fuel such as light oil or heavy oil and oxidizing gas (combustion air) are introduced into the furnace 2 from the burners 5 and burned in the furnace 2. The fuel introduced from the burners 5 is not limited to liquid fuel, but may also be gaseous fuel such as hydrogen, ammonia, or natural gas, or solid fuel such as biomass or coal in pulverized form.

[0013] As shown in Figures 1 and 5, the burner 5 comprises a main body 10 fixed to the furnace wall 3, a holder 20 attached to the main body 10, a burner gun 30 mounted on the holder 20, and a insertion / removal device 40 for moving the holder 20.

[0014] The main body 10 has a cylindrical inner cylinder (tube section) 11 extending along the central axis C, and a cylindrical outer cylinder 12 extending along the central axis C and covering the inner cylinder 11 from the radially outer side. The main body 10 is fixed to the furnace wall 3. In the following description, the direction in which the central axis C extends is also referred to as the "axial direction".

[0015] The outer cylinder 12 is a cylindrical member having a rectangular cross-sectional shape. The distal end portion of the outer cylinder 12 has an outer peripheral surface fixed to the furnace wall 3. Further, the proximal end portion of the outer cylinder 12 is fixed to the outer plate 4 that covers the furnace wall 3 from the outside via a fixing member 13. The fixing member 13 has a cylindrical portion fixed to the inner peripheral surface of the proximal end portion of the outer cylinder 12 and an annular portion that extends radially inward from the proximal end of the cylindrical portion and is fixed to the outer plate 4. The opening formed on the proximal end side of the outer cylinder 12 is closed by the annular portion of the fixing member 13 and a closing member 14. The closing member 14 is fixed to the radially inner end portion of the annular portion and is an annular member that further extends radially inward from the inner end portion.

[0016] The distal end portion of the inner cylinder 11 is provided at a position slightly recessed from the furnace wall 3. Inside the inner cylinder 11, a burner gun 30 described later is disposed. On the outer peripheral side of the distal end portion of the inner cylinder 11, a burner nozzle 16 for blocking the diffusion of combustion air supplied toward the flame is provided. The inner cylinder 11 connects the internal space of the furnace 2 and the external space of the furnace 2. An annular flange portion 15 that extends radially outward is provided at the proximal end portion of the inner cylinder 11. The flange portion 15 is fixed to the closing member 14. The main body portion 10 has a base portion 17 provided on the proximal end side of the flange portion 15. A through hole is formed on the base portion 17 on the central axis C. The through hole communicates with the inner cylinder 11. The cylindrical portion 21 of a holder 20 described later is inserted through this through hole. Further, a cylinder portion 41 of a plugging and unplugging device 40 is fixed to the base portion 17 at a position displaced radially outward from the central axis C.

[0017] The holder 20 is capable of relative movement along the direction in which the central axis C extends with respect to the main body portion 10. The holder 20 has a cylindrical portion 21 inserted into the inner cylinder 11 and a holder side mounting portion 22 provided on the proximal end side of the cylindrical portion 21 to which the burner gun 30 is mounted.

[0018] The holder-side mounting portion 22 has a through-hole extending axially inside, which communicates with the cylindrical portion 21. The burner gun 30, which will be described later, is inserted through the through-hole. The holder 20 is provided with a cover portion 25 that closes the through-hole when the burner gun 30 is removed.

[0019] The holder 20 has an interlocking part 26 that moves in conjunction with the piston rod 42 of the insertion / removal device 40. The interlocking part 26 is fixed to the holder-side mounting part 22. The holder 20 reciprocates axially by the insertion / removal device 40. Furthermore, a clamp member 29, which will be described later, is provided on the holder-side mounting portion 22 of the holder 20. In addition, a projection 22a is provided on the holder-side mounting portion 22 that protrudes in a direction perpendicular to the axial direction. The projection 22a is in contact with the contact portion of the lever lock pin 54, which will be described later.

[0020] Inside the holder 20, there is a fuel supply pipe 23 (see Figure 4) through which fuel supplied from a fuel supply device (not shown) flows. When the burner gun 30 is properly mounted in the holder 20, the fuel pipe 31 of the burner gun 30 and the fuel supply pipe 23 of the holder 20 are connected.

[0021] As shown in Figure 5, the burner gun 30 includes a fuel pipe 31 through which the inner cylinder 11 and the holder-side mounting portion 22 are inserted, and a burner gun-side mounting portion 32 provided at the base end of the fuel pipe 31 and attached to the holder 20.

[0022] The fuel pipe 31 is a cylindrical member having a central axis parallel to the central axis C. The fuel pipe 31 extends along the axial direction. Fuel flows through the inside of the fuel pipe 31. An injection nozzle 33 for injecting fuel into the furnace 2 is provided at the tip of the fuel pipe 31. The injection nozzle 33 is positioned to inject fuel into the furnace 2 at the ignition position, which will be described later. In this embodiment, the injection nozzle 33 is a pressure spray type that atomizes the fuel by the fuel supply pressure, but it may also be a two-fluid spray type that atomizes the fuel using a spray medium such as steam or air.

[0023] As shown in Figure 1, the burner gun side mounting portion 32 abuts against the base end of the holder side mounting portion 22 from the base end side. The burner gun side mounting portion 32 is fixed to the holder 20 by a clamp member 29.

[0024] The burner gun 30 is attached to the holder 20 by a clamp member 29. As shown in Figure 4, the clamp member 29 is, for example, roughly U-shaped in plan view, with its tip 29a connected to the holder 20. The clamp member 29 is attached by bringing the burner gun side mounting portion 32 of the burner gun 30 into contact with the holder side mounting portion 22 of the holder 20, and then locking its base end 29b into the burner gun side mounting portion 32 of the burner gun 30, while simultaneously tightening the tightening screw 29c provided on the base end 29b. This presses the burner gun side mounting portion 32 of the burner gun 30 against the holder 20 relative to the base end 29b, thereby restricting the relative movement between the burner gun 30 and the holder 20. In this way, the burner gun 30 can be easily attached to the holder 20 by using the clamp member 29. When the tightening screw 29c of the clamp member 29 is loosened, the base end 29b separates from the burner gun side mounting portion 32 of the burner gun 30. Then, the clamp member 29 is rotated around the tip portion 29a. This releases the base end 29b from the burner gun 30. As a result, the burner gun 30 can be easily removed from the holder 20.

[0025] As shown in Figures 1 and 2, the burner gun 30 is mounted on the holder 20 and inserted into the main body 10 (specifically, the inner cylinder 11), thereby positioning the burner gun 30 in the ignition position. In this inserted state (ignition position), fuel is injected into the furnace 2 from the injection nozzle 33 at the tip of the burner gun 30, forming a flame.

[0026] As shown in Figure 1, the insertion / removal device 40 has a cylinder portion 41 fixed to the main body portion 10 and a piston rod 42 that moves axially relative to the cylinder portion 41. The piston rod 42 is fixed to the holder 20. The insertion / removal device 40 inserts and removes the burner gun 30, which is mounted on the holder 20, from the main body 10 by moving the piston rod 42 axially relative to the cylinder 41. When the burner 5 is not in use (fire extinguished), the burner gun 30 is in the withdrawn position (fire extinguishing position). The attachment and removal of the burner gun 30 from the holder 20 is performed in this fire extinguishing position.

[0027] Next, the compressed air supply unit (gas supply unit) 50 will be explained using Figures 2 to 4. Figure 3 is a view of Figure 2 from the direction of arrow A, and Figure 4 is a view of Figure 2 from the direction of arrow B.

[0028] As shown in Figure 2, the burner 5 is equipped with a compressed air supply unit 50 that supplies compressed air into the inner cylinder 11. Note that the gas supplied into the inner cylinder 11 is not limited to compressed air, but may be other gases such as nitrogen. The compressed air supply unit 50 includes a compressed air supply pipe 51 and a compressed air valve (valve section) 52 provided on the compressed air supply pipe 51.

[0029] Compressed air supplied from a compressed air supply device (not shown) flows through the compressed air supply pipe 51. The downstream end of the compressed air supply pipe 51 is connected to the inner cylinder 11. The compressed air supply pipe 51 guides the compressed air flowing through it into the inner cylinder 11. The compressed air supply pipe 51 has a downstream end 51a that is connected to the inner cylinder 11 at its downstream end and extends in a direction perpendicular to the axial direction, and a straight section 51b that extends from the upstream end of the downstream end 51a in a curved direction in the axial direction. The upstream end of the straight section 51b is connected to the compressed air supply device. The straight section 51b extends substantially parallel to the fuel pipe 31 and the holder-side mounting section 22. A fixing section 51c is provided at an intermediate position in the straight section 51b to which the lever 53 is fixed.

[0030] The compressed air valve 52 can be switched between an open state, which supplies compressed air to the inside of the inner cylinder 11, and a closed state, which does not supply compressed air. The compressed air valve 52 is located in the straight section 51b of the compressed air supply pipe 51.

[0031] The compressed air valve 52 includes a lever 53 provided on the straight section 51b, a lever lock pin (lever lock section) 54 provided on the lever 53, and a burner gun lock pin (burner gun lock section) 55 provided on the lever 53.

[0032] The lever 53 is movable between an open position, which fully opens the compressed air valve 52, and a closed position, which fully closes it. The lever 53 is a plate-shaped member, and a cylindrical handle 57 extending upward is provided on its upper surface. The operator moves the lever 53 while gripping the handle 57. The base end of the lever 53 is fixed to the fixing part 51c. The lever 53 is rotatably fixed around the fixing point where it is fixed to the fixing part 51c.

[0033] In the closed position, the lever 53 extends in a direction perpendicular to the axial direction, as shown in Figure 2. In the closed position, the tip of the lever 53 protrudes from the straight section 51b. A handle 57 is also provided at the tip of the lever 53. In the open position, the lever 53 extends along the axial direction, as shown in Figure 8.

[0034] The lever lock pin 54 is a plate-shaped member inserted through a through hole formed in the lever 53. The lever lock pin 54 is positioned so that its plate surface is aligned axially. The lever lock pin 54 also fits into a fitting hole formed in the fixing part 51c when the lever 53 is in the closed position. When the tip of the lever lock pin 54 is fitted into the fitting hole, movement in directions other than vertical is restricted by the fitting hole. Furthermore, when the lever lock pin 54 is fitted into the fitting hole, its upper end protrudes upward from the upper surface of the lever 53. The lever lock pin 54 passes through the lever 53 and fits into the fitting hole of the fixing part 51c, thereby restricting the relative movement between the lever 53 and the fixing part 51c. In this way, the lever lock pin 54 restricts the movement of the lever 53 when its tip is fitted into the fitting hole. The method by which the lever lock pin 54 restricts the movement of the lever 53 is not limited to the method described above. For example, the lever lock pin 54 may be brought into contact (point contact or line contact) with a part of the side surface of the fixing part 51c to restrict the movement of the lever 53 from the closed position.

[0035] The lever lock pin 54 cannot engage with both the through hole formed in the lever 53 and the fitting hole formed in the fixing part 51c when the lever 53 is in a position other than the closed position. In other words, the lever lock pin 54 cannot restrict the relative movement between the lever 53 and the fixing part 51c when the lever 53 is in a position other than the closed position.

[0036] On the other hand, the lever lock pin 54 can be released from its fitted position by pulling it upwards, thereby removing its tip from the fitting hole. The lever lock pin 54 does not restrict the movement of the lever 53 when its tip is not fitted into the fitting hole. Therefore, the lever 53 can be moved from the closed position to the open position. In this way, the lever lock pin 54 can switch between a state that restricts the movement of the lever 53 and a state that allows it.

[0037] One end of a cord is connected to the upper end of the lever lock pin 54. The other end of the cord is connected to the lever 53. By connecting the lever lock pin 54 and the lever 53 with a cord in this way, the lever lock pin 54 is less likely to be lost.

[0038] The burner gun lock pin 55 is a plate-shaped member that passes through a through hole formed in the lever 53. The burner gun lock pin 55 is positioned so that its plate surface is perpendicular to the axial direction. The surface of the burner gun lock pin 55 facing the furnace wall 3 is in contact with the projection 22a of the holder-side mounting portion 22. That is, the burner gun lock pin 55 is in contact with the projection 22a from the side opposite to the furnace wall 3. When the lever 53 is in the closed position, the burner gun lock pin 55 is positioned so as to overlap with the projection 22a when viewed from the axial direction. Furthermore, the upper end of the burner gun lock pin 55 protrudes upward from the upper surface of the lever 53, and the lower end protrudes downward from the lower surface of the lever 53. The burner gun lock pin 55 switches between a state that restricts the relative movement of the burner gun 30 with respect to the inner cylinder 11 and a state that allows it.

[0039] In this way, when the lever 53 is in the closed position (as shown in Figure 2), the burner gun lock pin 55 contacts the projection 22a, thereby restricting the axial relative movement of the burner gun 30 with respect to the inner cylinder 11. That is, when attempting to move the burner gun 30 in the direction of removing it from the holder 20, the projection 22a and the burner gun lock pin 55 interfere with each other. This restricts the movement of the burner gun 30. Furthermore, the burner gun lock pin 55 allows axial relative movement of the burner gun 30 with respect to the inner cylinder 11 when the lever 53 is in the open position (the state shown in Figure 8). When the lever 53 is in the open position, the burner gun lock pin 55 and the projection 22a are not in contact. Therefore, even if the burner gun 30 is moved in the direction of being removed from the holder 20, the projection 22a and the burner gun lock pin 55 do not interfere with each other. This allows the burner gun 30 to move.

[0040] Next, the method for removing the burner gun 30 will be explained using Figures 2 to 10. Figure 6 is a view of Figure 5 from the direction of arrow A, and Figure 7 is a view of Figure 5 from the direction of arrow B. Also, Figure 9 is a view of Figure 8 from the direction of arrow A, and Figure 10 is a view of Figure 8 from the direction of arrow B.

[0041] During maintenance of the burner gun 30, the burner gun 30 is removed from the main body 10. In addition, in a boiler 1 that primarily uses solid fuel, the burner 5 that uses fuel oil is used only at startup and may become unnecessary after the boiler 1 has started up (after the burner that burns solid fuel, not shown, has ignited). In this case, after the boiler 1 has started up, the burner gun 30 is pulled out to the extinguishing position using the extraction device 40 and removed from the holder 20.

[0042] When burner 5 is ignited, the burner gun 30 mounted on holder 20 is properly inserted into main body 10, and the compressed air valve 52 is fully closed. In other words, compressed air is not supplied from compressed air supply unit 50 to the inside of inner cylinder 11. In this state, the lever lock pin 54 is locked. That is, the lever lock pin 54 is fitted into the fitting hole of the fixing part 51c of compressed air supply unit 50, restricting the movement of lever 53. Therefore, lever 53 cannot be moved from the closed position. Furthermore, in this state, the burner gun lock pin 55 is inserted through the lever 53 and is in contact with the protruding portion 22a of the holder-side mounting portion 22. Therefore, when the lever 53 is fixed in the closed position, the burner gun lock pin 55 restricts the axial movement of the burner gun 30. In other words, since the movement of the lever 53 is restricted, the movement of the burner gun lock pin 55 is also restricted, so even if one tries to move the burner gun 30 in the axial direction, the protruding portion 22a and the burner gun lock pin 55 interfere with each other, making it impossible to move. That is, the burner gun 30 cannot be removed from the holder 20.

[0043] After the burner 5 is extinguished, the burner gun 30 is pulled out to the extinguishing position by the removal device 40. In this state, when removing the burner gun 30 from the holder 20, as shown in Figures 5 to 7, first the lever lock pin 54 is pulled upward. This switches the lever lock pin 54 from a restricting state that restricts the movement of the lever 53 to a permissible state that allows the movement of the lever 53 (switching process). Next, the worker grasps the handle 57 provided on the lever 53 and rotates the lever 53 in the open position (lever movement process). This opens the compressed air valve 52 from the fully closed state. As a result, compressed air is supplied from the compressed air supply unit 50 to the inside of the inner cylinder 11. Also, by rotating the lever 53 in the open position, the burner gun lock pin 55 moves and is no longer in contact with the protruding part 22a. In other words, as the lever 53 moves, the burner gun lock pin 55 moves from a locked state (a state in which the burner gun 30 cannot be removed from the holder 20) to a released state (a state in which the burner gun 30 can be removed from the holder 20).

[0044] Before moving the lever 53 to the open position, the burner gun lock pin 55 is pulled upward as shown in Figures 8 to 10. This eliminates any protruding member from the underside of the lever 53, allowing the lever 53 to be moved to the open position. In other words, with the burner gun lock pin 55 installed, the lower end of the burner gun lock pin 55 interferes with the compressed air supply pipe 51, preventing the lever 53 from being moved to the open position. When the lever 53 is moved to the open position, the compressed air valve 52 becomes fully open. That is, compressed air is supplied appropriately from the compressed air supply unit 50 to the inside of the inner cylinder 11. In this state, the burner gun 30 is removed from the holder 20 (removal step). At this time, the internal space and external space of the furnace 2 are in communication via the inner cylinder 11, but the ejector effect of the compressed air supplied to the inside of the inner cylinder 11 draws air from the external space into the inner cylinder 11, thereby obstructing the flow of combustion gases and suppressing the leakage of combustion gases.

[0045] After removing the burner gun 30 from the main body 10, the lid 25 of the holder 20 closes the through hole (a hole communicating with the inner cylinder 11) formed in the holder-side mounting portion 22. This prevents the leakage of combustion gas from the inner cylinder 11. After closing the lid 25, the lever 53 is moved from the open position to the closed position to close the compressed air valve 52 and stop the supply of compressed air.

[0046] In this way, the burner gun 30 is removed from the holder 20.

[0047] Furthermore, even if the burner gun lock pin 55 is pulled out while the lever 53 is in the closed position, the burner gun 30 can still be removed from the holder 20. In this case, there is a possibility that the burner gun 30 will be removed before compressed air is supplied to the inside of the inner cylinder 11, which is undesirable. In this embodiment, when the lever 53 is in the closed position, the burner gun lock pin 55 and the handle 57 are arranged side by side in the removal direction. As a result, when the lever 53 is in the closed position, the handle 57 is positioned in front of the burner gun lock pin 55, making it difficult to pull out the burner gun lock pin 55. Therefore, it is possible to make it difficult to pull out the burner gun lock pin 55 when the lever 53 is in the closed position.

[0048] According to this embodiment, the following effects and advantages are achieved. In this embodiment, a burner gun lock pin 55 is provided that restricts the axial relative movement of the burner gun 30 with respect to the inner cylinder 11 when the lever 53 is in the closed position, and allows the axial relative movement of the burner gun 30 with respect to the inner cylinder 11 when the lever 53 is in the open position. The burner gun lock pin 55 allows the axial relative movement of the burner gun 30 with respect to the inner cylinder 11 when compressed air is supplied to the inside of the inner cylinder 11 (i.e., in the open state), so the burner gun 30 can be removed from the inner cylinder 11. As a result, when the burner gun 30 is removed from the inner cylinder 11, compressed air is supplied to the inside of the inner cylinder 11 from the compressed air supply unit 50. The compressed air supplied to the inside of the inner cylinder 11 obstructs the flow of combustion gas circulating inside the inner cylinder 11 from the internal space of the furnace 2 to the external space. Therefore, when the burner gun 30 is removed, it is difficult for fuel gas in the furnace 2 to leak through the inner cylinder 11. Thus, safety can be improved. Furthermore, the burner gun lock pin 55 restricts the axial relative movement of the burner gun 30 with respect to the inner cylinder 11 when compressed air is not supplied to the inner cylinder 11 (i.e., when it is closed), so the burner gun 30 cannot be removed from the inner cylinder 11. Even if one tries to remove the burner gun 30 from the inner cylinder 11, it is restricted by the burner gun lock pin 55. This makes it difficult to remove the burner gun 30 from the inner cylinder 11 when compressed air is not supplied to the inner cylinder 11. Therefore, leakage of combustion gas when removing the burner gun 30 can be further suppressed. Thus, safety can be further improved.

[0049] Furthermore, in this embodiment, the burner gun lock pin 55 has a tip that contacts the projection 22a from the opposite side of the furnace wall 3 in the axial direction when the lever 53 is in the closed position. As a result, when the lever 53 is in the closed position, the axial movement of the projection 22a (specifically, movement in the direction away from the furnace wall 3 in the axial direction) is restricted by the burner gun lock pin 55. Therefore, preferably, when compressed air is not supplied to the inside of the inner cylinder 11 (i.e., in the closed state), the burner gun 30 cannot be removed from the inner cylinder 11.

[0050] Furthermore, in this embodiment, the lever lock pin 54 restricts the movement of the lever 53 when the lever 53 is in the closed position. As a result, the lever 53 cannot be moved to the open position unless the lever lock pin 54 is operated to allow the movement of the lever 53. Therefore, since compressed air cannot be supplied to the inside of the inner cylinder 11 and the burner gun 30 cannot be removed unless the lever lock pin 54 is operated, leakage of combustion gas when removing the burner gun 30 can be further suppressed. Thus, safety can be further improved.

[0051] Furthermore, since the tip of the lever lock pin 54 is in contact with the protrusion 22a, even if the burner gun 30 is to be removed before moving the lever 53 (i.e., when the lever 53 is in the closed position and compressed air is not being supplied to the inner cylinder 11), the protrusion 22a presses the pin, causing the lever 53 to move towards the open position and the compressed air valve 52 to open. Therefore, even in such a case, compressed air can be supplied to the inner cylinder 11 when the burner gun 30 is removed, thus further suppressing the leakage of combustion gas when the burner gun 30 is removed. Thus, safety can be further improved.

[0052] This disclosure is not limited to the embodiments described above, and can be modified as appropriate without departing from its essence. For example, an example in which the lever lock pin 54 and the burner gun lock pin 55 are plate-shaped has been described, but this disclosure is not limited thereto. The lever lock pin 54 and the burner gun lock pin 55 may have other shapes, for example, they may be cylindrical.

[0053] The method for removing the burner, boiler, and burner gun described in the embodiments above can be understood, for example, as follows. A burner according to a first aspect of the present disclosure is a burner (5) provided on a furnace wall (3) defining a furnace (2) into which combustion gas is generated, comprising: a burner gun (30) for injecting fuel; a cylindrical portion (11) connecting the internal space of the furnace (2) and the external space of the furnace (2), into which the burner gun (30) is inserted and which extends in a predetermined direction; and a gas supply portion (50) for supplying gas into the cylindrical portion (11), wherein the gas supply portion (50) has a valve portion (52) for switching between an open state for supplying gas into the cylindrical portion (11) and a closed state for not supplying gas. The valve section (52) includes a lever (53) that moves between an open position and a closed position; a lever lock section (54) that switches between a state that restricts the movement of the lever (53) and a state that allows it; and a burner gun lock section (55) that restricts the relative movement of the burner gun (30) with respect to the cylindrical section (11) in a predetermined direction when the lever (53) is in the closed position, and allows the relative movement of the burner gun (30) with respect to the cylindrical section (11) in a predetermined direction when the lever (53) is in the open position.

[0054] The above configuration includes a burner gun lock that restricts relative movement of the burner gun relative to the cylinder in a predetermined direction when the lever is in the closed position, and allows relative movement of the burner gun relative to the cylinder in a predetermined direction when the lever is in the open position. The burner gun lock allows relative movement of the burner gun relative to the cylinder in a predetermined direction when gas is supplied to the inside of the cylinder (i.e., in the open state), so the burner gun can be removed from the cylinder. As a result, when the burner gun is removed from the cylinder, gas is supplied to the inside of the cylinder from the gas supply unit. The gas supplied to the inside of the cylinder obstructs the flow of combustion gas circulating inside the cylinder from the internal space of the furnace to the external space. Therefore, when the burner gun is removed, it is difficult for fuel gas from inside the furnace to leak through the cylinder. Thus, safety can be improved. Furthermore, the burner gun lock restricts the relative movement of the burner gun in a predetermined direction relative to the cylinder when no gas is supplied to the inside of the cylinder (i.e., in the closed state), making it impossible to remove the burner gun from the cylinder. Even if one attempts to remove the burner gun from the cylinder, it will be restricted by the burner gun lock. This makes it difficult to remove the burner gun from the cylinder when no gas is supplied to the inside of the cylinder. Therefore, leakage of combustion gas when removing the burner gun can be further suppressed. Thus, safety can be further improved. One example of the gas supplied by the gas supply unit is compressed air.

[0055] Furthermore, in the second aspect of the present disclosure, the burner gun (30) has a projection (22a) that protrudes in a direction intersecting the predetermined direction, and the burner gun lock (55) has a contact portion that contacts the projection (22a) from the opposite side of the furnace wall (3) in the predetermined direction when the lever (53) is in the closed position.

[0056] In the above configuration, the burner gun lock portion has a contact portion that contacts the protruding portion from the opposite side of the furnace wall in a predetermined direction when the lever is in the closed position. As a result, when the lever is in the closed position, the movement of the protruding portion in a predetermined direction (specifically, movement in the direction away from the furnace wall) is restricted by the contact portion. Therefore, preferably, when no gas is supplied to the inside of the cylinder portion (i.e., in the closed state), it is possible to prevent the burner gun from being removed from the cylinder portion.

[0057] Furthermore, in the third aspect of the present disclosure, the burner, in the first or second aspect, has a lever lock portion (54) that restricts the movement of the lever (53) when the lever (53) is in the closed position.

[0058] In the above configuration, the lever lock restricts the movement of the lever when it is in the closed position. As a result, the lever cannot be moved to the open position unless the lever lock is operated to allow the lever to move. Therefore, gas cannot be supplied to the inside of the inner cylinder and the burner gun cannot be removed unless the lever lock is operated, thus further suppressing the leakage of combustion gas when the burner gun is removed. Thus, safety can be improved.

[0059] A boiler according to the first aspect of this disclosure comprises a burner as described in any of the first to third aspects.

[0060] Furthermore, a method for removing a burner gun according to a first aspect of this disclosure is a method for removing a burner gun (30) in a burner (5) provided on a furnace wall (3) defining a furnace (2) into which combustion gas is generated, wherein the burner (5) comprises a burner gun (30) for injecting fuel, a cylindrical portion (11) connecting the internal space of the furnace (2) and the external space of the furnace (2), into which the burner gun (30) is inserted and which extends in a predetermined direction, and a gas supply portion (50) for supplying gas into the cylindrical portion (11), wherein the gas supply portion (50) has a valve portion (52) for switching between an open state for supplying gas into the cylindrical portion (11) and a closed state for not supplying gas, and the valve portion (52) moves between an open position for the open state and a closed position for the closed state The device comprises a movable lever (53), a lever locking part (54) that switches between a state that restricts the movement of the lever (53) and a state that allows the movement of the lever (53), and a burner gun locking part (55) that restricts the relative movement of the burner gun (30) with respect to the cylindrical part (11) in a predetermined direction when the lever (53) is in the closed position, and allows the relative movement of the burner gun (30) with respect to the cylindrical part (11) in a predetermined direction when the lever (53) is in the open position, and includes a switching step of switching the lever locking part (54) from the restricting state to the allowing state, a lever movement step of moving the lever (53) from the closed position to the open position, and a removal step of removing the burner gun (30) from the cylindrical part (11). [Explanation of symbols]

[0061] 1: Boiler 2: Furnace 3: Furnace wall 4:Outer plate 5: Burner 10: Main body 11: Inner cylinder 12: Outer cylinder 13: Fixing member 14: Closing member 15: Flange section 16: Burner Nozzle 17: Base 20: Holder 21: Cylindrical section 22: Holder side mounting part 22a:Protrusion 23:Fuel supply pipe 25: Lid 26: Interlocking section 29: Clamp member 29a:Tip 29b: Proximal end 29c: Tightening screw 30: Burner Gun 31: Fuel pipe 32: Burner gun side mounting part 33: Spray nozzle 40: Insertion / extraction device 41: Cylinder section 42: Piston rod 50: Compressed air supply unit 51: Compressed air supply pipe 51a: Downstream end 51b: Straight section 51c: Fixed part 52: Compressed air valve 53: Lever 54: Lever lock pin 55: Burner gun lock pin 57: Handle

Claims

1. A burner provided on the furnace wall that defines the furnace in which combustion gases are generated, A burner gun that injects fuel, A cylindrical portion connecting the internal space of the furnace and the external space of the furnace, into which the burner gun is inserted and extending in a predetermined direction, It comprises a gas supply unit that supplies gas into the interior of the cylindrical portion, The gas supply unit has a valve that switches between an open state, which supplies gas into the inside of the cylindrical section, and a closed state, which does not supply gas. The valve section of the burner includes a lever that moves between an open position and a closed position; a lever lock section that switches between a state that restricts the movement of the lever and a state that allows the movement of the lever; and a burner gun lock section that restricts the relative movement of the burner gun with respect to the cylindrical portion in the predetermined direction when the lever is in the closed position, and allows the relative movement of the burner gun with respect to the cylindrical portion in the predetermined direction when the lever is in the open position.

2. The burner gun has a protruding portion that protrudes in a direction intersecting the predetermined direction, The burner according to claim 1, wherein the burner gun lock portion has a contact portion that contacts the protruding portion from the opposite side of the furnace wall in the predetermined direction when the lever is in the closed position.

3. The burner according to claim 1, wherein the lever lock portion restricts the movement of the lever when the lever is in the closed position.

4. A boiler comprising a burner according to any one of claims 1 to 3.

5. A method for removing a burner gun in a burner provided on the furnace wall that defines a furnace where combustion gases are generated, The aforementioned burner, A burner gun that injects fuel, A cylindrical portion connecting the internal space of the furnace and the external space of the furnace, into which the burner gun is inserted and extending in a predetermined direction, It comprises a gas supply unit that supplies gas into the interior of the cylindrical portion, The gas supply unit has a valve that switches between an open state, which supplies gas into the inside of the cylindrical section, and a closed state, which does not supply gas. The valve section includes a lever that moves between an open position and a closed position, a lever lock section that switches between a state that restricts the movement of the lever and a state that allows the movement of the lever, and a burner gun lock section that restricts the relative movement of the burner gun with respect to the cylinder in the predetermined direction when the lever is in the closed position, and allows the relative movement of the burner gun with respect to the cylinder in the predetermined direction when the lever is in the open position. A switching step of switching the lever lock portion from a restricted state to an permitted state, A lever movement step of moving the lever from the closed position to the open position, A method for removing a burner gun, comprising a removal step of removing the burner gun from the cylindrical portion.

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