Deposit removal device and deposit removal method

Abstract

To remove deposit without stopping a boiler.SOLUTION: A deposit removal device 100 includes a burner gun 5, a guide cylinder 40, a fuel supply valve 71 and a spray medium supply valve 72. The burner gun 5 includes: fuel conveyance passages 11, 14 for conveying fuel F supplied from the fuel supply valve 71; spray medium conveyance passages 12, 15 for conveying a spray medium G supplied from the spray medium supply valve 72; a connection part that is attached to the tip parts of the fuel conveyance passages 11, 14 and the spray medium conveyance passages 12, 15 and with which a combustion part for mixing and injecting the fuel F and the spray medium G toward a furnace 2 is detachably connected; and a deposit removal part connected to the connection part from which the combustion part is detached and having an injection port 13E1 for injecting the spray medium G supplied from the spray medium conveyance passages 12, 15 for removing deposit 200 adhered to a portion in the vicinity of the guide cylinder 40 toward the deposit 200.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present disclosure relates to an attachment removal device and an attachment removal method.

Background Art

[0002] Conventionally, an oil-fired burner gun is known in which fuel oil supplied from the outside of a boiler is atomized by a spraying medium such as air or steam and injected into the furnace of the boiler (see, for example, Patent Document 1). The oil-fired burner gun of Patent Document 1 includes an oil transfer pipe for transferring fuel oil, a gas transfer pipe for transferring air or steam, and a nozzle provided at the tip of the oil-fired burner gun for injecting the fuel oil transferred through the oil transfer pipe and the air or steam transferred through the gas transfer pipe into the furnace.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The oil-fired burner gun disclosed in Patent Document 1 has a flame stabilizer at the tip on the furnace side. Depending on the properties of the fuel and other fossil fuels used simultaneously, deposits may adhere and grow on the front surface of the flame stabilizer. If the fuel sprayed from the oil-fired burner gun interferes with the deposits, there is a possibility that high-temperature fuel may enter the inside of the guide cylinder or the air box of the oil-fired burner gun.

[0005] In order to remove the deposits adhering to the flame arrester, it is necessary to stop the boiler and either pull out the entire oil burner gun including the flame arrester or install a scaffold inside the furnace and remove the deposits from the inside of the furnace. However, a great deal of time and cost are incurred for the boiler shutdown and associated work. On the other hand, if the boiler cannot be stopped, the operation of the oil burner gun has to be suspended, which may disrupt the operation such as boiler load limitation.

[0006] The present disclosure has been made in view of such circumstances, and an object thereof is to provide a deposit removal device and a deposit removal method capable of removing deposits without stopping the boiler.

Means for Solving the Problems

[0007] In order to solve the above problems, the deposit removal device and the deposit removal method of the present disclosure employ the following means. A deposit removal device according to an aspect of the present disclosure includes a burner that injects fuel toward a furnace and is formed to extend along an axis, a cylindrical portion into which the burner is detachably inserted and is formed to extend along the axis, a fuel supply unit that supplies the fuel to the burner, and a spray medium supply unit that supplies a spray medium to be injected together with the fuel to the burner. The burner includes a fuel conveyance path that conveys the fuel supplied from the fuel supply unit, a spray medium conveyance path that conveys the spray medium supplied from the spray medium supply unit, and a connection portion to which a combustion portion that mixes the fuel and the spray medium and injects the mixture toward the furnace is detachably connected at the tip of the fuel conveyance path and the spray medium conveyance path. The deposit removal device further includes a deposit removal portion that is connected to the connection portion from which the combustion portion has been removed and has an injection port that injects the spray medium supplied from the spray medium conveyance path toward the deposits adhering in the vicinity of the cylindrical portion to remove the deposits.

[0008] The deposit removal method according to one aspect of the present disclosure includes a burner that injects fuel toward a furnace and is formed to extend along an axis, a cylindrical portion into which the burner is detachably inserted and formed to extend along the axis, a fuel supply unit that supplies the fuel to the burner, and a spray medium supply unit that supplies a spray medium to be injected together with the fuel to the burner. The deposit removal method removes deposits adhering to the vicinity of the cylindrical portion by means of a deposit removal device, wherein the burner has a fuel conveyance path that conveys the fuel supplied from the fuel supply unit, a spray medium conveyance path that conveys the spray medium supplied from the spray medium supply unit, and a connection portion attached to the tip ends of the fuel conveyance path and the spray medium conveyance path, to which a combustion portion that mixes the fuel and the spray medium and injects the mixture toward the furnace is detachably connected. The deposit removal method includes a removal step of removing the burner having the combustion portion connected to the connection portion from the cylindrical portion, an exchange step of removing the combustion portion from the connection portion and attaching an attachment removal portion having an injection port for injecting the spray medium supplied from the spray medium conveyance path toward the deposits to the connection portion to remove the deposits adhering to the vicinity of the cylindrical portion, and a deposit removal step of injecting the spray medium supplied from the spray medium conveyance path from the deposit removal portion toward the deposits.

Advantages of the Invention

[0009] According to the present disclosure, it is possible to provide a deposit removal device and a deposit removal method capable of removing deposits without stopping the boiler.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0011] Hereinafter, the burner gun 5 and the deposit removing device 100 according to an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a state where the burner gun 5 to which the nozzle 13 is connected is attached to the boiler 1. FIG. 2 is a front view showing the burner gun 5 shown in FIG. 1.

[0012] As shown in FIG. 1, the boiler 1 includes a furnace 2 that continuously extends in a cylindrical shape in the vertical direction VD, a wind box front panel 3a that is provided at a horizontal interval with respect to the side wall 2s of the furnace 2 and covers the furnace 2 from the outside, and a plurality of burner guns (burners) 5 disposed outside the furnace 2. In the boiler 1, fuel F such as light oil or heavy oil and a spray medium G composed of air or steam are injected from the burner gun 5 into the furnace 2, and the injected fuel F burns in the furnace 2. Examples of the fuel F include petroleum such as heavy oil and light oil, various process waste liquids, liquefied ammonia, etc., and the fuel F is supplied to the burner gun 5 in a liquid state.

[0013] The burner gun 5 is formed to extend along the axis X, and includes a fuel transport pipe (fuel transport path) 11 that transports the fuel F, a spray medium transport pipe (spray medium transport path) 12 that transports the spray medium G, a nozzle 13, and a pipe connection member 20. The burner gun 5 injects the fuel F and the spray medium G into the furnace 2 and is detachable from the boiler 1.

[0014] The fuel transfer pipe 11 and the atomizing medium transfer pipe 12 are each formed of, for example, a pipe material made of metal. The base end portion 11a of the fuel transfer pipe 11 is connected to the pipe connection member 20, and the tip end portion 11b is connected to the nozzle 13 via the flexible pipe (fuel transfer path) 14.

[0015] The base end portion 12a of the atomizing medium transfer pipe 12 is connected to the pipe connection member 20, and the tip end portion 12b is connected to the nozzle 13 via the flexible pipe (atomizing medium transfer path) 15. The fuel transfer pipe 11 and the atomizing medium transfer pipe 12 each have a fixed length on the tip end portion 11b, 12b side, which is a straight pipe portion 11s, 12s that extends linearly.

[0016] The nozzle 13 injects the fuel F conveyed through the fuel transfer pipe 11 and the atomizing medium G conveyed through the atomizing medium transfer pipe 12 into the furnace 2. The tip end portions 11b, 12b of the fuel transfer pipe 11 and the atomizing medium transfer pipe 12 are connected to the nozzle 13 via flexible pipes 14, 15 having flexibility. The nozzle 13 is a so-called two-fluid injection valve that atomizes and injects the fuel F with the atomizing medium G.

[0017] As shown in FIG. 1, the pipe connection member 20 is a member that supplies the fuel F to the fuel transfer pipe 11 via the connection fitting 30 and supplies the atomizing medium G to the atomizing medium transfer pipe 12 via the connection fitting 30. The pipe connection member 20 is detachably fixed to the connection fitting 30.

[0018] The boiler 1 further includes a connection fitting 30, a guide cylinder (cylindrical portion) 40, a compressed air supply portion 50, a flame retention device 60, a fuel supply valve (fuel supply portion) 71, an atomizing medium supply valve (atomizing medium supply portion) 72, a bypass valve (bypass portion) 73, and a control portion 90.

[0019] The connection fitting 30 is fixed to the bellows 3 and supplies the fuel F to the fuel transfer pipe 11 and the atomizing medium G to the atomizing medium transfer pipe 12 via the pipe connection member 20.

[0020] The guide cylinder 40 is a cylindrical body into which the fuel transfer pipe 11 and the atomizing medium transfer pipe 12 of the burner gun 5 are detachably inserted. The guide cylinder 40 is formed in a cylindrical shape so as to extend along the axis X. The burner gun 5 is formed such that a nozzle 13 for injecting the fuel F and the atomizing medium G toward the furnace 2 is formed at the end portion and extends along the axis X.

[0021] The compressed air supply unit 50 is fixed to the connection fitting 30 and is a device that supplies compressed air Ap toward the inside of the guide cylinder 40. When the burner gun 5 is removed from the guide cylinder 40, the compressed air supply unit 50 supplies the compressed air Ap in order to prevent combustion gas or the like in the furnace 2 from entering the guide cylinder 40.

[0022] The compressed air supply unit 50 supplies the compressed air Ap supplied from the compressed air supply source 51 via the compressed air supply passage 52 toward the inside of the guide cylinder 40 from the injection ports 53 provided at a plurality of locations around the axis X. The supply state of the compressed air Ap from the compressed air supply passage 52 to the injection ports 53 is switched by a switching valve 52a.

[0023] The flame holder 60 is disposed at the end of the guide cylinder 40 on the furnace 2 side and is a device that imparts a swirling force to the combustion air Ac supplied to the furnace 2. The combustion air Ac is introduced into the bellows 3 and is supplied to the furnace 2 after passing through the flame holder 60 and the outer peripheral side of the flame holder 60. As shown in FIG. 2, the flame holder 60 includes an inner cylinder 61 and an outer cylinder 62 formed in an annular shape around the axis X, and a plurality of swirling vanes 63 arranged in the circumferential direction around the axis X so as to connect both the inner cylinder 61 and the outer cylinder 62.

[0024] The flame holder 60 shown in FIGS. 1 and 2 is a swirler type flame holder having the swirling vanes 63, but other embodiments may be used. For example, instead of the swirling vanes 63, a plate-shaped diffuser type flame holder with the surface on the furnace 2 side closed may be used. In the case of the diffuser type flame holder, the combustion air abutted against the flame holder forms a swirling flow on the outer peripheral side of the flame holder.

[0025] The fuel supply valve (fuel supply section) 71 is a device that supplies fuel F supplied from a fuel supply source to the burner gun 5. By setting the fuel supply valve 71 to the open state, the fuel F is supplied to the fuel supply passage 21 of the pipe connection member 20 via the fuel supply line 71a and the connection fitting 30. The fuel F supplied to the fuel supply passage 21 is supplied to the fuel transfer pipe 11 from the base end portion 11a.

[0026] The spray medium supply valve (spray medium supply section) 72 is a device that supplies the spray medium G supplied from a spray medium supply source to the burner gun 5. By setting the spray medium supply valve 72 to the open state, the spray medium G is supplied to the spray medium supply passage 22 of the pipe connection member 20 via the spray medium supply line 72a and the connection fitting 30. The spray medium G supplied to the spray medium supply passage 22 is supplied to the spray medium transfer pipe 12 from the base end portion 12a.

[0027] The bypass valve (bypass section) 73 is a device that supplies the spray medium G supplied from a spray medium supply source to the burner gun 5. By setting the bypass valve 73 to the open state, the spray medium G is supplied to the fuel supply passage 21 of the pipe connection member 20 via the fuel supply line 71a and the connection fitting 30. The spray medium G supplied to the fuel supply passage 21 is supplied to the fuel transfer pipe 11 from the base end portion 11a.

[0028] The control unit 90 is a device that controls each part of the boiler 1 including the switching valve 52a, the fuel supply valve 71, the spray medium supply valve 72, and the bypass valve 73.

[0029] Next, an attachment removing method for removing the attachments 200 adhering to the flame stabilizer 60 (including the vicinity of the tip on the furnace 2 side of the guide cylinder 40. The same applies hereinafter) will be described. As shown in FIGS. 1 and 2, the attachments 200 adhere to the end face on the furnace 2 side of the flame stabilizer 60 so as to surround the nozzle 13 of the burner gun 5 around the axis X. The attachments 200 are, for example, those in which carbon in the fuel F is carbonized or those in which ash is solidified. As shown in FIG. 2, the attachments 200 are formed in an annular shape so as to surround the nozzle 13 around the axis X, for example.

[0030] As shown in FIG. 2, the nozzle 13 is formed with a plurality of injection ports 13a for injecting fuel F and atomizing medium G. In the example shown in FIG. 2, six injection ports 13a are formed around the axis X. As shown in FIG. 1, the fuel F and the atomizing medium G injected from the injection port 13a are injected toward a radial injection range S1 centered on the axis X.

[0031] As shown in FIG. 1, when the deposit 200 grows, the tip of the deposit 200 interferes with the injection range S1. When the fuel F is injected toward the tip of the deposit 200, a part of the fuel F may enter the inside of the guide cylinder 40 or the inside of the air box 3 through the flame holder 60. Therefore, in the present embodiment, after removing the burner gun 5 from the guide cylinder 40 and replacing the combustion part 13C of the nozzle 13 described later with the deposit removal part 13E, the burner gun 5 is inserted into the guide cylinder 40 to remove the deposit 200 from the flame holder 60.

[0032] FIG. 3 is a flowchart showing a deposit removal method according to an embodiment of the present disclosure. In step S101, prior to removing the burner gun 5 from the guide cylinder 40, the operator inputs an instruction to the control unit 90 to execute a purge sequence. The control unit 90 closes the fuel supply valve 71 and opens the bypass valve 73 to execute the purge sequence.

[0033] In the purge sequence, by opening the bypass valve 73, the atomizing medium G is supplied to the fuel supply path 21 of the pipe connection member 20 via the fuel supply line 71a and the connection fitting 30. The atomizing medium G supplied to the fuel supply path 21 is supplied to the fuel transfer pipe 11 from the base end portion 11a. Since the atomizing medium G is supplied to the fuel transfer pipe 11, the fuel F remaining in the fuel transfer pipe 11 is discharged toward the furnace 2 side by the atomizing medium G. During the execution of the purge sequence, the opening / closing state of the atomizing medium supply valve 72 may be appropriately switched.

[0034] In step S102, the operator performs a removal process of removing the burner gun 5 from the guide cylinder 40. The operator removes the pipe connection member 20 of the burner gun 5 from the connecting fitting 30, and removes the fuel transfer pipe 11 and the spray medium transfer pipe 12 from the guide cylinder 40 along the axis X. When the burner gun 5 is removed from the guide cylinder 40, the state shown in FIG. 4 is obtained. FIG. 4 is a longitudinal sectional view showing the state where the burner gun 5 shown in FIG. 1 is removed from the boiler 1.

[0035] In step S103, the operator performs an exchange process of exchanging the combustion burner tip (combustion part) 13C of the nozzle 13 with the deposit removal burner tip (deposit removal part) 13E. Here, the nozzle 13 will be described with reference to FIGS. 5 and 6. FIG. 5 is a longitudinal sectional view showing the nozzle 13 with the combustion part 13C connected to the connection part 13A. FIG. 6 is a longitudinal sectional view showing the nozzle 13 with the deposit removal part 13E connected to the connection part 13A.

[0036] As shown in FIG. 5, the nozzle 13 has a connection part 13A, a back plate 13B, a combustion part 13C, and a cap 13D. The connection part 13A has a first connection member 13A1 joined to the tip of the flexible pipe 14 and the tip of the flexible pipe 15 by welding or the like, and a second connection member 13A2 disposed on the outer peripheral side of the first connection member 13A1 and joined to the first connection member 13A1 by welding or the like.

[0037] A fuel passage 13A3 is formed in the first connection member 13A1. Fuel F is guided from the flexible pipe 14 into the fuel passage 13A3. A spray medium passage 13A4 is formed between the first connection member 13A1 and the second connection member 13A2. Spray medium G is guided from the flexible pipe 15 into the spray medium passage 13A4.

[0038] The back plate 13B is formed with a plurality of fuel passages 13B1. Fuel F is led into the fuel passage 13B1 from the fuel passage 13A3. The back plate 13B is formed with a plurality of atomizing medium passages 13B2. Atomizing medium G is led into the atomizing medium passage 13B2 from the atomizing medium passage 13A4.

[0039] The combustion part 13C is a member attached to the tip of the flexible pipe 14 and the tip of the flexible pipe 15 via the back plate 13B. The combustion part 13C is formed with a plurality of fuel passages 13C1. Fuel F is led into the fuel passage 13C1 from the fuel passage 13B1. The combustion part 13C is formed with an atomizing medium chamber 13C2. Atomizing medium G is led into the atomizing medium chamber 13C2 from the atomizing medium passage 13B2. The combustion part 13C is formed with a plurality of injection ports 13a. The combustion part 13C mixes the fuel F led from the plurality of fuel passages 13C1 and the atomizing medium G led from the atomizing medium chamber 13C2 at the injection ports 13a and injects the mixture into the furnace 2.

[0040] The cap 13D is a member that detachably fixes the back plate 13B and the combustion part 13C to the connection part 13A. An internal thread 13D1 is formed on the inner peripheral surface of the end on the connection part 13A side along the axis X of the cap 13D. By engaging the internal thread 13D1 with the external thread 13A5 formed on the outer peripheral surface of the second connection member 13A2, the cap 13D is fixed to the connection part 13A.

[0041] By removing the cap 13D from the connection part 13A, the back plate 13B and the combustion part 13C can be made not connected to the connection part 13A. By fixing the cap 13D to the connection part 13A with the back plate 13B and the combustion part 13C sandwiched between the cap 13D and the connection part 13A, the back plate 13B and the combustion part 13C can be made connected to the connection part 13A.

[0042] The operator removes the cap 13D from the connection part 13A, replaces the combustion part 13C with the deposit removal part 13E, and fixes the cap 13D to the connection part 13A with the back plate 13B and the deposit removal part 13E sandwiched between the cap 13D and the connection part 13A, so that the state shown in FIG. 6 in which the back plate 13B and the deposit removal part 13E are connected to the connection part 13A can be achieved.

[0043] In the nozzle 13 shown in FIG. 6, the deposit removal part 13E is connected to the connection part 13A instead of the combustion part 13C. A plurality of injection ports 13E1 are formed in the deposit removal part 13E. The deposit removal part 13E is connected to the connection part 13A from which the combustion part 13C has been removed via the back plate 13B. The deposit removal part 13E is a member that injects the spray medium G supplied from the flexible pipe 15 toward the deposit 200 in order to remove the deposit 200 adhering to the flame holder 60.

[0044] In step S104, the operator attaches the burner gun 5 with the deposit removal part 13E attached to the nozzle 13 to the guide cylinder 40. The operator inserts the fuel transfer pipe 11 and the spray medium transfer pipe 12 along the axis X into the guide cylinder 40, and attaches the pipe connection member 20 of the burner gun 5 to the connection fitting 30. When the burner gun 5 is attached to the guide cylinder 40, the state shown in FIG. 7 is obtained.

[0045] FIG. 7 is a longitudinal sectional view showing a state in which the burner gun 5 with the deposit removal part 13E connected to the connection part 13A is inserted into the guide cylinder 40. As shown in FIG. 7, the deposit removal device 100 of the present embodiment includes a burner gun 5, a fuel supply valve 71, a spray medium supply valve 72, a bypass valve 73, and a control unit 90.

[0046] In step S105, the operator inputs an instruction to the control unit 90 to inject the spraying medium G from the injection port 13E1 of the deposit removal unit 13E. The control unit 90 closes the fuel supply valve 71 and the bypass valve 73, and opens the spraying medium supply valve 72. As shown in FIG. 7, the spraying medium G injected from the injection port 13E1 is injected toward a radial spraying range S2 centered on the injection port 13E1 directed in a direction perpendicular to the axis X.

[0047] The control unit 90 controls the spraying medium supply valve 72 to stop the injection of the spraying medium G from the injection port 13E1 in response to, for example, the elapse of a predetermined time after the start of the injection of the spraying medium G from the injection port 13E1. The predetermined time is set to, for example, a time sufficient for the deposits 200 adhering to the flame holder 60 to be removed by the spraying medium G injected from the injection port 13E1.

[0048] In step S106, the operator executes a removal process of removing the burner gun 5 from the guide cylinder 40. The operator removes the pipe connection member 20 of the burner gun 5 from the connecting fitting 30, and removes the fuel transfer pipe 11 and the spraying medium transfer pipe 12 from the guide cylinder 40 along the axis X. When the burner gun 5 is removed from the guide cylinder 40, the state shown in FIG. 4 is obtained.

[0049] In step S107, the operator executes an exchange process of exchanging the deposit removal unit 13E of the nozzle 13 with the combustion unit 13C. The operator removes the cap 13D from the connection portion 13A, exchanges the deposit removal unit 13E with the combustion unit 13C, and fixes the cap 13D to the connection portion 13A with the back plate 13B and the combustion unit 13C sandwiched between the cap 13D and the connection portion 13A, so as to obtain the state shown in FIG. 5 in which the back plate 13B and the combustion unit 13C are connected to the connection portion 13A.

[0050] In step S108, the operator attaches the burner gun 5 with the combustion part 13C attached to the nozzle 13 to the guide cylinder 40. The operator inserts the fuel conveyance pipe 11 and the atomizing medium conveyance pipe 12 along the axis X into the guide cylinder 40, and attaches the pipe connection member 20 of the burner gun 5 to the connecting fitting 30. When the burner gun 5 is attached to the guide cylinder 40, the state shown in FIG. 1 is obtained. Thus, a series of processes of the deposit removal method according to an embodiment of the present disclosure is completed.

[0051] In the above description, the deposit removal part 13E is configured not to have a passage communicating with the fuel passage 13B1 of the back plate 13B, but other embodiments may be possible. For example, it may be configured to include a plurality of atomizing medium passages 13F2 as in the deposit removal part 13F shown in FIG. 8. FIG. 8 is a longitudinal sectional view showing the nozzle 13 to which the deposit removal part 13F of the modification example is connected to the connection part 13A.

[0052] As shown in FIG. 8, a plurality of injection ports 13F1 are formed in the deposit removal part 13F. The deposit removal part 13F is connected to the connection part 13A from which the combustion part 13C is removed via the back plate 13B. The deposit removal part 13F is a member that injects the atomizing medium G supplied from the flexible pipe 15 toward the deposit 200 in order to remove the deposit 200 adhering to the flame holder 60.

[0053] As shown in FIG. 8, a plurality of atomizing medium passages 13F2 are formed in the deposit removal part 13F. The atomizing medium passage 13F2 communicates with the fuel passage 13B1 of the back plate 13B. In this modification example, by supplying the atomizing medium G instead of the fuel F to the flexible pipe 14, the atomizing medium G is supplied from the flexible pipe 14 to the fuel passage 13A3 of the connection part 13A. The atomizing medium G is guided from the fuel passage 13A3 to the atomizing medium passage 13F2 of the deposit removal part 13F through the fuel passage 13B1 of the back plate 13B. The atomizing medium G guided to the atomizing medium passage 13F2 is injected from the plurality of injection ports 13F1 toward the deposit 200.

[0054] When the deposit removal unit 13F shown in FIG. 8 is attached to the nozzle 13, the control unit 90 closes the fuel supply valve 71 and opens the spray medium supply valve 72 and the bypass valve 73. By doing so, the spray medium G is guided to the fuel transfer pipe 11 of the burner gun 5 through the bypass valve 73. In this modified example, the bypass valve 73 is in a cutoff state where the spray medium G supplied from the spray medium supply valve 72 is not guided to the fuel transfer pipe 11 when the combustion unit 13C is connected to the connection portion 13A, and is in a supply state where the spray medium G supplied from the spray medium supply valve 72 is guided to the fuel transfer pipe 11 when the deposit removal unit 13F is connected to the connection portion 13A.

[0055] According to the deposit removal device 100 of the present embodiment described above, the following operations and effects are achieved. According to the deposit removal device 100 of the present embodiment, when the combustion unit 13C is connected to the connection portion 13A of the burner gun 5, the fuel F supplied from the fuel supply valve 71 through the fuel transfer pipe 11 and the spray medium G supplied from the spray medium supply valve 72 through the spray medium transfer pipe 12 are mixed in the combustion unit 13C and sprayed toward the furnace 2. On the other hand, when the deposit removal unit 13E is connected to the connection portion 13A of the burner gun 5, the spray medium G supplied from the spray medium supply valve 72 through the spray medium transfer pipe 12 is sprayed from the injection port 13E1 of the deposit removal unit 13E toward the deposit 200. According to the deposit removal device 100 of the present embodiment, by replacing the combustion unit 13C connected to the connection portion 13A of the burner gun 5 with the deposit removal unit 13E, it is possible to remove the deposits adhering to the vicinity of the guide cylinder 40 and the deposits 200 adhering to the flame holder 60 without stopping the boiler 1.

[0056] According to the deposit removing device 100 of the present embodiment, when the combustion unit 13C is connected to the connection unit 13A, the bypass valve 73 is set to a shut-off state in which the spraying medium G is not introduced into the fuel transfer pipe 11, so that the combustion unit 13C mixes the fuel F and the spraying medium G and injects them into the furnace 2. On the other hand, when the deposit removing unit 13F is connected to the connection unit 13A, the bypass valve 73 is set to a supply state in which the spraying medium G is introduced into the fuel transfer pipe 11, so that the deposit removing unit 13F injects the spraying medium G from the injection port 13F1. When the deposit removing unit 13F is connected to the connection unit 13A, by supplying the spraying medium G to the deposit removing unit 13F from both the spraying medium transfer pipe 12 and the fuel transfer pipe 11, the amount of the spraying medium G injected from the deposit removing unit 13F is increased, and the removal performance of the deposit 200 is improved.

[0057] The deposit removing device 100 and the deposit removing method described in each of the above-described embodiments are understood as follows, for example. The deposit removing device according to the first aspect of the present disclosure includes a burner (5) that injects fuel toward a furnace (2) and is formed to extend along an axis (X), a cylindrical portion (40) into which the burner is detachably inserted and is formed to extend along the axis, a fuel supply unit (71) that supplies the fuel to the burner, and a spraying medium supply unit (72) that supplies a spraying medium to be injected together with the fuel to the burner. The burner includes a fuel transfer pipe (11) that transfers the fuel supplied from the fuel supply unit, a spraying medium transfer pipe (12) that transfers the spraying medium supplied from the spraying medium supply unit, and a connection unit (13A) to which a combustion unit (13C) that mixes the fuel and the spraying medium and injects them toward the furnace is detachably connected at the tip of the fuel transfer pipe and the spraying medium transfer pipe. The deposit removing device further includes a deposit removing unit (13E) that is connected to the connection unit from which the combustion unit has been removed and has an injection port (13E1) that injects the spraying medium supplied from the spraying medium transfer pipe toward the deposit adhering near the cylindrical portion to remove the deposit.

[0058] According to the deposit removing device according to the first aspect of the present disclosure, when the combustion part is connected to the connection part of the burner, the fuel supplied from the fuel supply part through the fuel conveyance path and the atomizing medium supplied from the atomizing medium supply part through the atomizing medium supply path are mixed in the combustion part and jetted toward the furnace. On the other hand, when the deposit removing part is connected to the connection part of the burner, the atomizing medium supplied from the atomizing medium supply part through the atomizing medium supply path is jetted from the injection port of the deposit removing part toward the deposit. According to the deposit removing device according to the first aspect of the present disclosure, by replacing the combustion part connected to the connection part of the burner with the deposit removing part, deposits can be removed without stopping the boiler.

[0059] The deposit removing device according to the second aspect of the present disclosure further includes the following configuration in the first aspect. That is, it includes a flame stabilizer (60) that is disposed at the end of the cylindrical part on the furnace side and imparts a swirling force to the combustion air supplied to the furnace, and the deposit removing part jets the atomizing medium toward the deposit adhering to the flame stabilizer from the injection port.

[0060] According to the deposit removing device according to the second aspect of the present disclosure, deposits adhering to the flame stabilizer that imparts a swirling force to the combustion air supplied to the furnace can be removed without stopping the boiler.

[0061] The deposit removing device according to the third aspect of the present disclosure further includes the following configuration in the first aspect or the second aspect. That is, the removing medium is steam or compressed gas. According to the deposit removing device according to the third aspect of the present disclosure, by jetting steam or compressed air from the injection port toward the deposit, the deposit can be suitably removed without stopping the boiler.

[0062] The deposit removal device according to the fourth aspect of the present disclosure includes, in the first aspect or the second aspect, a bypass portion (73) that guides the spray medium supplied from the spray medium supply portion to the fuel conveyance pipe. When the combustion portion is connected to the connection portion, the bypass portion is in a cutoff state in which the spray medium supplied from the spray medium supply portion is not guided to the fuel conveyance pipe. When the deposit removal portion is connected to the connection portion, the bypass portion is in a supply state in which the spray medium supplied from the spray medium supply portion is guided to the fuel conveyance pipe. The deposit removal portion injects the spray medium supplied from the fuel conveyance pipe toward the deposit from the injection port.

[0063] According to the deposit removal device according to the fourth aspect of the present disclosure, when the combustion portion is connected to the connection portion, the bypass portion is in a cutoff state in which the spray medium is not guided to the fuel conveyance path, so that the combustion portion mixes the fuel and the spray medium and injects them into the furnace. On the other hand, when the deposit removal portion is connected to the connection portion, the bypass portion is in a supply state in which the spray medium is guided to the fuel conveyance path, so that the deposit removal portion injects the spray medium from the injection port. When the deposit removal portion is connected to the connection portion, by supplying the spray medium from both the spray medium conveyance path and the fuel conveyance path to the deposit removal portion, the amount of the spray medium injected from the deposit removal portion is increased, and the removal performance of the deposit is improved.

[0064] The deposit removal method according to the fifth aspect of the present disclosure includes a burner that injects fuel toward a furnace and is formed to extend along an axis, a cylindrical portion into which the burner is detachably inserted and formed to extend along the axis, a fuel supply unit that supplies the fuel to the burner, and a spray medium supply unit that supplies a spray medium to be injected together with the fuel to the burner. The deposit removal method removes deposits adhering to the vicinity of the cylindrical portion by means of a deposit removal device, wherein the burner has a fuel conveyance path that conveys the fuel supplied from the fuel supply unit, a spray medium conveyance path that conveys the spray medium supplied from the spray medium supply unit, and a connection portion detachably connected to the tip ends of the fuel conveyance path and the spray medium conveyance path, to which a combustion portion that mixes the fuel and the spray medium and injects the mixture toward the furnace is detachably connected. The deposit removal method includes a removal step (S102) of removing the burner having the combustion portion connected to the connection portion from the cylindrical portion, an exchange step (S103) of removing the combustion portion from the connection portion and attaching to the connection portion a deposit removal portion having an injection port that injects the spray medium supplied from the spray medium conveyance path toward the deposits to remove the deposits adhering to the vicinity of the cylindrical portion, and a deposit removal step (S105) of injecting the spray medium supplied from the spray medium conveyance path from the deposit removal portion toward the deposits.

[0065] According to the deposit removal method according to the fifth aspect of the present disclosure, when the combustion portion is connected to the connection portion of the burner, the fuel supplied from the fuel supply unit via the fuel conveyance path and the spray medium supplied from the spray medium supply unit via the spray medium conveyance path are mixed at the combustion portion and injected toward the furnace. On the other hand, when the deposit removal portion is connected to the connection portion of the burner, in the deposit removal step, the spray medium supplied from the spray medium supply unit via the spray medium conveyance path is injected from the injection port of the deposit removal portion toward the deposits. According to the deposit removal method according to the fifth aspect of the present disclosure, by exchanging the combustion portion connected to the connection portion of the burner with the deposit removal portion, deposits can be removed without stopping the boiler.

[0066] The deposit removal method according to the sixth aspect of the present disclosure further includes the following in the fifth aspect. That is, in the deposit removal step, the injection of the spray medium from the injection port is stopped in response to the elapse of a predetermined time after the injection of the spray medium from the injection port is started.

[0067] According to the deposit removal method according to the sixth aspect of the present disclosure, since the injection of the spray medium from the injection port is maintained for a predetermined time after the injection of the spray medium from the injection port is started, deposits can be appropriately removed without stopping the boiler.

Explanation of Signs

[0068] 1 Boiler 2 Firebox 3 Bellows 5 Burner gun (burner) 11 Fuel transfer pipe (fuel transfer path) 12 Spray medium transfer pipe (spray medium transfer path) 13 Nozzle 13A Connection part 13A1 First connection member 13A2 Second connection member 13A3 Fuel passage 13A4 Spray medium passage 13A5 Male thread 13B Back plate 13B1 Fuel passage 13B2 Spray medium passage 13C Combustion part 13C1 Fuel passage 13C2 Spray medium chamber 13D Cap 13D1 Female thread 13E, 13F Deposit removal part 13E1, 13F1 Injection port 13F2 Spray medium passage 13a Injection port 14 Flexible pipe (fuel transfer path) 15 Flexible pipe (spray medium transfer path) 20 Pipe connection member 21 Fuel supply path 22 Spray medium supply path 30 Connector 40 Guide cylinder (cylindrical part) 50 Compressed air supply section 51 Compressed air supply source 52 Compressed air supply path 52a Changeover valve 53 Injection port 60 Flame arrester 71 Fuel supply valve (fuel supply section) 71a Fuel supply line 72 Spray medium supply valve (spray medium supply section) 72a Spray medium supply line 73 Bypass valve 90 Control section 100 Deposit removal device 200 Deposit Ac Combustion air Ap Compressed air F Fuel G Spray medium S1, S2 Injection range VD Vertical direction X Axis

Claims

1. A burner that injects fuel toward the furnace and extends along an axis; A cylindrical portion into which the burner is detachably inserted and which is formed in a cylindrical shape so as to extend along the axis; a fuel supply unit for supplying the fuel to the burner; an atomizing medium supply unit that supplies an atomizing medium to be injected together with the fuel to the burner; The burner is a fuel transport passage that transports the fuel supplied from the fuel supply unit; A spray medium conveying path that conveys the spray medium supplied from the spray medium supply unit; a connecting portion to which a combustion portion that mixes the fuel and the atomizing medium and injects the mixture toward the furnace is detachably connected, the connecting portion being attached to a tip end of the fuel transport path and the atomizing medium transport path; an adhesion removal unit that is connected to the connection unit from which the combustion unit has been removed and has an injection port that injects the spray medium supplied from the spray medium transport path toward the adhesions in order to remove adhesions adhering in the vicinity of the cylindrical portion.

2. a flame stabilizer that is disposed at an end of the cylindrical portion on the furnace side and that imparts a swirl force to the combustion air supplied to the furnace; The deposit removal device according to claim 1 , wherein the deposit removal unit injects the spray medium from the injection port toward the deposit adhering to the flame stabilizer.

3. 3. The deposit removal device according to claim 1, wherein the spray medium is steam or compressed gas.

4. a bypass portion for guiding the atomizing medium supplied from the atomizing medium supply portion to the fuel transport path, the bypass section is in a blocking state in which the spray medium supplied from the spray medium supply section is not guided to the fuel transport path when the combustion section is connected to the connection section, and in a supply state in which the spray medium supplied from the spray medium supply section is guided to the fuel transport path when the deposit removal section is connected to the connection section, 3. The deposit removal device according to claim 1, wherein the deposit removal section injects the spray medium supplied from the fuel transport passage from the injection port toward the deposit.

5. A method for removing deposits that are attached near the tubular portion by an deposit removal device including: a burner that injects fuel toward a furnace and is formed to extend along an axis; a tubular portion into which the burner is detachably inserted and that is formed into a cylindrical shape so as to extend along the axis; a fuel supply unit that supplies the fuel to the burner; and an atomizing medium supply unit that supplies an atomizing medium to be injected together with the fuel to the burner, The burner is a fuel transport passage that transports the fuel supplied from the fuel supply unit; A spray medium conveying path that conveys the spray medium supplied from the spray medium supply unit; a connecting portion to which a combustion portion that mixes the fuel and the atomizing medium and injects the mixture toward the furnace is detachably connected, the connecting portion being attached to a tip end of the fuel transport path and the atomizing medium transport path, a removal process of removing the burner, with the combustion section connected to the connection section, from the cylindrical section; a replacement process of removing the combustion unit from the connection part, and attaching to the connection part an attachment removal part having an injection port that injects the spray medium supplied from the spray medium transport path toward the attachment in order to remove the attachment; and an adhesion removing step of spraying the spray medium supplied from the spray medium transport path from the adhesion removing section toward the adhesion.

6. The method for removing adhesions according to claim 5 , wherein the adhesion removal step stops spraying of the spray medium from the nozzle when a predetermined time has elapsed since starting spraying of the spray medium from the nozzle.

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