Shock Wave Generation Device

Abstract

To provide a shock wave generation device for actualizing highly precise supply control of combustible gas to be supplied to a combustion device.SOLUTION: The shock wave generation device includes a combustion device in which a gas passage is provided in a range from the base end to the front end for combustion gas to flow therein, and at the front end of which an opening part is provided, a fuel supply pathway for supplying fuel, an oxidizer supply pathway for supplying oxidizer, combustible gas supply pathway for supplying combustible gas having fuel and the oxidizer mixed to the combustion device, a fuel flow amount adjustment device for adjusting the flow amount of the fuel flowing in the fuel supply pathway, an oxidizer flow amount adjustment device for adjusting the flow amount of the oxidizer flowing in the oxidizer supply pathway, and an ignition device for igniting the combustible gas supplied to the combustion device.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a shock wave generating device for generating a shock wave by detonation.

Background Art

[0002] For example, in a waste incinerator, an integrated gasification combined cycle power generation facility (IGCC), a boiler for power generation, etc., dust contained in the exhaust gas adheres to the inner wall surface of the furnace, the outer surface of the heat transfer tube, etc. The dust adhering to the inner wall surface of the furnace, the outer surface of the heat transfer tube, etc. reduces the heat transfer rate and deteriorates the heat recovery efficiency, or becomes a resistance to the flow of the exhaust gas and reduces the performance of the furnace. Therefore, it is necessary to periodically remove the dust adhering to the inner wall of the furnace and the outer surface of the heat transfer tube by a dust removal device.

[0003] The dust removal device has a shock wave generating device. The shock wave generating device generates a shock wave by detonation in which the flame propagation speed exceeds the speed of sound by burning fuel. The dust removal device removes dust by the shock wave generated by the shock wave generating device. As such a conventional shock wave generating device, there is one described in the following patent document.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The shock wave generating device supplies an air-fuel mixture in which fuel and an oxidizer are mixed to a combustion chamber, and when the combustion chamber is filled with a predetermined amount of the air-fuel mixture, the air-fuel mixture is ignited. Then, when the air-fuel mixture burns, a shock wave is generated by detonation. In this case, when supplying the air-fuel mixture to the combustion chamber, in order to obtain the total amount of the supplied air-fuel mixture, the pressure of the pressure vessel upstream of the combustor is monitored. However, during the supply of the air-fuel mixture to the combustion chamber, since the pressure of the combustion chamber fluctuates, the instantaneous flow rate at this time cannot be known, and it becomes difficult to precisely control the flow rate of the mixer to the combustion chamber.

[0006] The present disclosure solves the above-described problems, and an object thereof is to provide a shock wave generating device that aims to improve the accuracy of controlling the supply amount of combustible gas supplied to a combustion chamber.

Means for Solving the Problems

[0007] The shock wave generating device of the present disclosure for achieving the above object includes a combustion device provided with a gas passage through which combustion gas flows from the base end toward the tip end and having an opening at the tip end, a fuel supply path for supplying fuel, an oxidizer supply path for supplying an oxidizer, a combustible gas supply path for supplying the combustible gas in which the fuel and the oxidizer are mixed to the combustion device, a fuel flow rate adjusting device for adjusting the flow rate of the fuel flowing through the fuel supply path, an oxidizer flow rate adjusting device for adjusting the flow rate of the oxidizer flowing through the oxidizer supply path, and an ignition device for igniting the combustible gas supplied to the combustion device.

Effects of the Invention

[0008] According to the shock wave generating device of the present disclosure, it is possible to improve the accuracy of controlling the supply amount of combustible gas supplied to the combustion device.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, preferred embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited by this embodiment, and when there are multiple embodiments, those configured by combining each embodiment are also included. In addition, the constituent elements in the embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those within the so-called equivalent range.

[0011] [First Embodiment] <Shock Wave Generation Device> Figure 1 is a schematic configuration diagram showing the shock wave generation device of the first embodiment.

[0012] As shown in FIG. 1, the shock wave generating device 10 of the first embodiment is applied to a dust removing device that removes dust adhering to the inner wall surface of a furnace such as a garbage incinerator, a coal gasification combined power generation facility, or a power generation boiler (hereinafter referred to as a boiler), or the outer surface of a heat transfer tube. The furnace is composed of a wall portion surrounding the combustion field of the boiler, and the dust removing device can remove dust adhering to the inner wall surface of the wall portion continuous with the upper or lower part of the furnace. The dust removing device supplies a combustible gas into the furnace through a pipe communicating with the inside of the furnace, and generates a shock wave S by detonation by igniting the combustible gas. That is, when the combustible gas burns, a detonation wave in which a flame and a shock wave are integrated propagates, and when the combustible gas runs out, it propagates as a shock wave. The dust removing device blows off and removes the adhering dust by the action of the shock wave S generated by detonation on the inner wall of the furnace or the outer surface of the heat transfer tube.

[0013] The shock wave generating device 10 is provided in the dust removing device, and generates a shock wave S by detonation due to fuel combustion when the dust removing device operates during the stop of the boiler.

[0014] The shock wave generating device 10 includes a combustion device 11, a combustible gas supply device 12, an ignition device 13, and a control device 14.

[0015] The combustion device 11 has a gas passage 21 through which combustion gas flows from the base end toward the tip end. The combustion device 11 has a detonator 22 and a combustor 23. The gas passage 21 is composed of a first passage 24 provided inside the detonator 22 and a second passage 25 provided inside the combustor 23.

[0016] The detonator 22 has a cylindrical shape, with the base end 22a closed and the tip end 22b open. The detonator 22 is provided with a first passage 24 of a predetermined length inside. The detonator 22 has a combustible gas supply device 12 connected to the base end 22a. The combustor 23 has a cylindrical shape, with the base end 23a connected to and communicating with the tip end 22b of the detonator 22, and the tip end 23b open with an opening 23c provided. The gas passage 21 of the detonator 22 and the second passage 25 of the combustor 23 are concentric. However, the gas passage 21 of the detonator 22 and the second passage 25 of the combustor 23 may not be concentric and may have different shapes. The combustor 23 is provided with a second passage 25 of a predetermined length inside. The second passage 25 of the combustor 23 has a larger diameter than the first passage 24 of the detonator 22. The combustor 23 has the same diameter for the second passage 25 from the base end 23a to the tip end 22b, but the tip end 22b may have an enlarged diameter with respect to the base end 23a.

[0017] The detonator 22 is provided with a mixing accelerator 26 at the base end 22a. The mixing accelerator 26 promotes the mixing of the fuel F and the oxidizer A. The mixing accelerator 26 is, for example, a diffuser, a vortex generator composed of a plurality of protrusions, a rectifier such as a grid, or a combination thereof. The combustor 23 has the opening 23c at the tip end 23b communicating with the internal space 103 partitioned by the furnace wall 102 of the furnace 101.

[0018] The combustible gas supply device 12 has a fuel supply section 31 and an oxidizer supply section 41. The fuel supply section 31 supplies the fuel F. The oxidizer supply section 41 supplies oxygen or air as the oxidizer A. The combustible gas supply device 12 supplies the mixture of the fuel F supplied by the fuel supply section 31 and the oxidizer A supplied by the oxidizer supply section 41 as the combustible gas M into the interior from the base end of the combustion device 11.

[0019] The fuel supply unit 31 includes a fuel supply path 32, a fuel cylinder 33, a pressure reducing valve 34, a mass flow controller (fuel flow rate adjusting device) 35, a safety device 36, a fuel supply valve 37, and a check valve 38. The fuel supply path 32 has the fuel cylinder 33 connected to its upstream end, and the pressure reducing valve 34, the mass flow controller 35, the safety device 36, the fuel supply valve 37, and the check valve 38 are provided on the downstream side. The fuel cylinder 33 stores the fuel F. The pressure reducing valve 34 reduces the pressure of the fuel F in the fuel cylinder 33 and adjusts the pressure of the supplied fuel F. The mass flow controller 35 measures the mass flow rate of the fuel F, compares the measured mass flow rate of the fuel F with a preset set value of the fuel F, and adjusts the opening degree of the flow control valve so that the mass flow rate of the fuel F becomes the set value. The safety device 36 prevents flashback. The fuel supply valve 37 is an on-off valve, supplies the fuel F when open, and stops the supply of the fuel F when closed. The check valve 38 prevents the backflow of the fuel F and the combustible gas M to the upstream side.

[0020] The oxidant supply unit 41 includes an oxidant supply path 42, an oxidant cylinder 43, a pressure reducing valve 44, a mass flow controller (oxidant flow rate adjusting device) 45, a safety device 46, an oxidant supply valve 47, and a check valve 48. The oxidant supply path 42 has the oxidant cylinder 43 connected to its upstream end, and the pressure reducing valve 44, the mass flow controller 45, the safety device 46, the oxidant supply valve 47, and the check valve 48 are provided on the downstream side. The oxidant cylinder 43 stores the oxidant A. The pressure reducing valve 44 reduces the pressure of the oxidant A in the oxidant cylinder 43 and adjusts the pressure of the supplied oxidant A. The mass flow controller 45 measures the mass flow rate of the oxidant A, compares the measured mass flow rate of the oxidant A with a preset set value of the oxidant A, and adjusts the opening degree of the flow control valve so that the mass flow rate of the oxidant A becomes the set value. The safety device 46 prevents flashback. The oxidant supply valve 47 is an on-off valve, supplies the oxidant A when open, and stops the supply of the oxidant A when closed. The check valve 48 prevents the backflow of the oxidant A and the combustible gas M to the upstream side.

[0021] The fuel supply path 32 and the oxidant supply path 42 are connected at their downstream ends to the upstream end of the combustible gas supply path 52 via a cross joint 51, and the downstream end of the combustible gas supply path 52 is connected to the proximal end 22a of the detonator 22. Also, the purge gas path 53 has a blower 54 connected to its upstream end and is connected to the cross joint 51 at its downstream end. A purge gas supply valve 55 is provided in the purge gas path 53. The cross joint 51 communicates the fuel supply path 32, the oxidant supply path 42, the combustible gas supply path 52, and the purge gas path 53. The blower 54 supplies a purge gas (e.g., air, inert gas, etc.) P to the combustible gas supply path 52. The purge gas supply valve 55 is an on-off valve that supplies the purge gas P when open and stops the supply of the purge gas P when closed.

[0022] The ignition device 13 ignites the combustible gas M supplied to the detonator 22 in the combustion device 11. The ignition device 13 is provided at the proximal end 22a of the detonator 22.

[0023] The control device 14 has the ignition device 13, the mass flow controller 35, the fuel supply valve 37, the mass flow controller 45, the oxidant supply valve 47, and the purge gas supply valve 55 connected thereto.

[0024] The control device 14 can control the ignition timing of the combustible gas M by the ignition device 13. The control device 14 can adjust and control the mass flow controller 35 and the mass flow controller 45. The control device 14 can open and close the fuel supply valve 37, the oxidant supply valve 47, and the purge gas supply valve 55.

[0025] Here, the control device 14 is a controller, and is realized, for example, by various programs stored in a storage unit being executed with a RAM as a work area by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like.

[0026] <Flow rate adjustment control of combustible gas> The mass flow controller 35 measures the mass flow rate of the fuel F flowing through the fuel supply path 32, compares the mass flow rate of the fuel F with the set value of the fuel F, and adjusts the opening degree of the flow control valve so that the mass flow rate of the fuel F becomes the set value. The set value of the fuel F is set according to the form of the combustion device 11 and the combustion information. The mass flow controller 45 measures the mass flow rate of the oxidant A flowing through the oxidant supply path 42, compares the mass flow rate of the oxidant A with the set value of the oxidant A, and adjusts the opening degree of the flow control valve so that the mass flow rate of the oxidant A becomes the set value. The set value of the oxidant A is set according to the form of the combustion device 11 and the combustion information. Note that the set value of the fuel F and the set value of the oxidant A may be set by pre-adjusting the mass flow controllers 35 and 45, or may be set by the control device 14. The mixing ratio R of the combustible gas M is set by the set value of the fuel F and the set value of the oxidant A.

[0027] The supply amount of the combustible gas M supplied from the combustible gas supply device 12 to the combustion device 11 is determined by the set values of the fuel F and the oxidant A set by the mass flow controllers 35 and 45 and the opening times of the fuel supply valve 37 and the oxidant supply valve 47. The control device 14 sets the set values of the fuel F and the oxidant A with the mass flow controllers 35 and 45 and controls the opening times of the fuel supply valve 37 and the oxidant supply valve 47. That is, when the set values of the fuel F and the oxidant A are set by the mass flow controllers 35 and 45, the control device 14 can obtain the instantaneous supply amounts (mixing ratio) of the fuel F and the oxidant A when the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11.

[0028] By applying the mass flow controllers 35 and 45, the instantaneous flow rate when the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11 can be controlled. Therefore, when the combustible gas M is supplied to the combustion device 11, the mixing ratio of the fuel F and the oxidant A can be maintained constant with high precision, and a shock wave due to detonation can be generated with a stable intensity. Note that the mixing ratio of the fuel F and the oxidant A to be controlled varies depending on the combination of the fuel F and the oxidant A, but is in the range of R (molar ratio) = 0.001 to 20.

[0029] Further, by setting each set value of the fuel F and the oxidant A by the mass flow controllers 35 and 45, the control device 14 can adjust the supply amount of the combustible gas M according to the opening times of the fuel supply valve 37 and the oxidant supply valve 47. Basically, the shock wave generator 10 generates a stronger shock wave by detonation when a larger amount of the combustible gas M (fuel F) is supplied. However, for example, when the amount of dust to be removed is small, it is not necessary to increase the supply amount of the combustible gas M (fuel F) to increase the intensity of the shock wave by detonation. Therefore, the control device 14 adjusts the supply amount of the combustible gas M according to the opening times of the fuel supply valve 37 and the oxidant supply valve 47, and for example, may supply an amount of the combustible gas M (fuel F) corresponding to the amount of dust to be removed. By such control, the usage amounts of the fuel F and the oxidant A can be suppressed, and the running cost can be reduced.

[0030] [Second Embodiment] FIG. 2 is a graph showing the control of the supply amount of the combustible gas in the shock wave generator according to the second embodiment. The basic configuration of the second embodiment is the same as that of the first embodiment described above, and will be described with reference to FIG. 1. Members having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0031] As shown in FIG. 1, the shock wave generator 10 includes a combustion device 11, a combustible gas supply device 12, an ignition device 13, and a control device 14. The control device 14 can adjust the supply amount of the combustible gas M to the combustion device 11 by adjusting the opening times of the fuel supply valve 37 and the oxidant supply valve 47. Further, set values of the supply amounts per unit time of the fuel F and the oxidant A are set by the mass flow controllers 35 and 45. The control device 14 can adjust the mixing ratio R of the fuel F and the oxidant A in the combustible gas M by changing the set values of the fuel F and the oxidant A by the mass flow controllers 35 and 45.

[0032] When the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11, the control device 14 adjusts the mixing ratio R of the combustible gas M by changing the set values of the mass flow controllers 35 and 45.

[0033] When the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11, even though the set values of the mass flow controllers 35 and 45 are constant values, the mixing ratio R of the combustible gas M may vary due to external factors. For example, until immediately before the operation of the shock wave generator 10, the inside of the combustion device 11 is filled with the purge gas P. Here, when the purge gas P is air, the inside of the combustion device 11 is filled with air which is an oxidant. Therefore, even when the combustible gas supply device 12 starts supplying the combustible gas M with a predetermined mixing ratio R to the combustion device 11, at the initial stage of supply, the oxidant (air) remaining in the combustion device 11 and the combustible gas M will be mixed, and the mixing ratio will decrease.

[0034] Therefore, at the initial stage of supplying the combustible gas M from the combustible gas supply device 12 to the combustion device 11, the control device 14 changes the set values of the mass flow controllers 35 and 45 to a mixing ratio R at which the fuel F becomes excessive. Here, the initial stage of supplying the combustible gas M is a predetermined period set in advance from the opening times of the fuel supply valve 37 and the oxidant supply valve 47. As shown in FIGS. 1 and 2, at time t0, the control device 14 operates the combustible gas supply device 12 to open the fuel supply valve 37 and the oxidant supply valve 47, and starts supplying the combustible gas M to the combustion device 11. At this time, the control device 14 sets the set values of the mass flow controllers 35 and 45 to a mixing ratio R at which the fuel F becomes excessive. The control device 14 changes the set values of the mass flow controllers 35 and 45 so that, for example, the initial mixing ratio (fuel / oxidant) Rg becomes a value obtained by multiplying a predetermined mixing ratio R by a coefficient a (1 < a < 10). Then, at time t1, the initial mixing ratio Rg at which the fuel F becomes excessive is obtained.

[0035] The control device 14 maintains the initial mixture ratio Rg constant, for example, from time t1 to time t2. Then, the control device 14 decreases the mixture ratio (fuel / oxidizer) R from time t2 to time t3. The control device 14 decreases, for example, from the initial mixture ratio Rg where the fuel F is excessive to a predetermined mixture ratio R from time t2 to time t3. In this case, although the mixture ratio R changes continuously, it may also change stepwise. Thereafter, at time t3, the operation of the combustible gas supply device 12 is stopped, the fuel supply valve 37 and the oxidizer supply valve 47 are closed, and at time t4, the supply of the combustible gas M ends.

[0036] Note that in the above description, the initial mixture ratio Rg was maintained constant from time t1 to time t2 and the mixture ratio R was decreased from time t2 to time t3, but it is not limited to this configuration. For example, the initial mixture ratio Rg may be decreased to the mixture ratio R from time t1 to time t3, or the initial mixture ratio Rg may be decreased to the mixture ratio R from time t1 to time t2 and the mixture ratio R may be maintained constant from time t2 to time t3. Also, the coefficient a and the degree of change for setting the initial mixture ratio Rg may be given as a sequence by grasping the remaining air amount in advance by CFD analysis or the like, or the remaining air amount inside the combustion device 11 may be measured by a measuring instrument (not shown) and feedback control may be applied to the mixture ratio R.

[0037] Further, the ignition device 13 is disposed at the proximal end of the combustion device 11. Therefore, the ignition device 13 ignites the combustible gas M immediately before the supply to the combustion device 11 ends. At this time, the ignition device 13 desires to steadily ignite the combustible gas M inside the combustion device 11. Thus, at the end stage of the supply of the combustible gas M to the combustion device 11 by the combustible gas supply device 12, the control device 14 changes the set values of the mass flow controllers 35 and 45 to change to a mixing ratio R at which the ignition device 13 can easily ignite the combustible gas M. Here, the end stage of supply is a predetermined period set in advance retrogressing from the stop time in the opening times of the fuel supply valve 37 and the oxidant supply valve 47 set according to the filling amount of the combustible gas M to the combustion device 11. That is, the control device 14 changes the set values of the mass flow controllers 35 and 45 so that at time t3 which is the end stage of the supply of the combustible gas M, the mixing ratio R becomes near the stoichiometric mixing ratio Rs which is the ratio at which the fuel F and the oxidant A react without excess or deficiency. The stoichiometric mixing ratio Rs is, for example, a value obtained by multiplying a predetermined mixing ratio R by a coefficient b (0.3 < b < 3).

[0038] [Third Embodiment] FIG. 3 is a schematic configuration diagram showing the shock wave generating device of the third embodiment. Members having the same functions as those of the first embodiment described above are denoted by the same reference numerals and detailed descriptions thereof are omitted.

[0039] The shock wave generating device 10A includes a combustion device 11, a combustible gas supply device 12A, an ignition device 13, and a control device 14. The combustion device 11, the ignition device 13, and the control device 14 are the same as those in the first embodiment.

[0040] The combustible gas supply device 12A includes a fuel supply unit 31A and an oxidant supply unit 41A. The fuel supply unit 31A includes a fuel supply path 32, a fuel cylinder 33, a pressure reducing valve 34, a sonic nozzle (fuel flow rate adjusting device) 61, a safety device 36, a fuel supply valve 37, and a check valve 38. In the second embodiment, as the fuel flow rate adjusting device, the mass flow controller 35 in the first embodiment is changed to a sonic nozzle 61. Further, the oxidant supply unit 41A includes an oxidant supply path 42, an oxidant cylinder 43, a pressure reducing valve 44, a sonic nozzle (oxidant flow rate adjusting device) 71, a safety device 46, an oxidant supply valve 47, and a check valve 48. In the second embodiment, as the oxidant flow rate adjusting device, the mass flow controller 45 in the first embodiment is changed to a sonic nozzle 71.

[0041] The sonic nozzles 61 and 71 are not controlled by the control device 14, and the set values of the fuel F and the oxidant A are preset. Although the sonic nozzles 61 and 71 are provided as the fuel flow rate adjusting device and the oxidant flow rate adjusting device, an orifice may be used instead.

[0042] By applying the sonic nozzles 61 and 71 or orifices as the fuel flow rate adjusting device and the oxidant flow rate adjusting device, the instantaneous flow rate of the combustible gas M supplied from the combustible gas supply device 12A to the combustion device 11 can be appropriately adjusted.

[0043] [Fourth Embodiment] FIG. 4 is a schematic configuration diagram showing the shock wave generating device of the fourth embodiment. Members having the same functions as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0044] The shock wave generating device 10B includes a combustion device 11, a combustible gas supply device 12B, an ignition device 13, and a control device 14. The combustion device 11, the ignition device 13, and the control device 14 are the same as those in the first embodiment.

[0045] The combustible gas supply device 12B includes a fuel supply unit 31B and an oxidant supply unit 41B. The fuel supply unit 31B includes a fuel supply path 32, a fuel cylinder 33, a pressure reducing valve 34, a sonic nozzle device (fuel flow rate adjusting device) 61B, a safety device 36, a fuel supply valve 37, and a check valve 38. In the third embodiment, as the fuel flow rate adjusting device, it is changed from the mass flow controller 35 in the first embodiment to the sonic nozzle device 61B. Further, the oxidant supply unit 41B includes an oxidant supply path 42, an oxidant cylinder 43, a pressure reducing valve 44, a sonic nozzle device (oxidant flow rate adjusting device) 71B, a safety device 46, an oxidant supply valve 47, and a check valve 48. In the third embodiment, as the oxidant flow rate adjusting device, it is changed from the mass flow controller 45 in the first embodiment to the sonic nozzle device 71B.

[0046] In the sonic nozzle device 61B, the fuel supply path 32 is provided with a first fuel branch path 62 and a second fuel branch path 63 in parallel between the pressure reducing valve 34 and the safety device 36. The first fuel branch path 62 and the second fuel branch path 63 are respectively provided with a first sonic nozzle 64 and a second sonic nozzle 65, a first on-off valve 66 and a second on-off valve 67. The control device 14 can control the opening and closing of the first on-off valve 66 and the second on-off valve 67. In the sonic nozzle device 71B, the oxidant supply path 42 is provided with a first oxidant branch path 72 and a second fuel branch path 73 in parallel between the pressure reducing valve 44 and the safety device 46. The first oxidant branch path 72 and the second fuel branch path 73 are respectively provided with a first sonic nozzle 74 and a second sonic nozzle 75, a first on-off valve 76 and a second on-off valve 77. The control device 14 can control the opening and closing of the first on-off valve 76 and the second on-off valve 77. Note that the sonic nozzles 64, 65, 74, and 75 may be orifices.

[0047] The control device 14 controls the opening and closing of the first on-off valve 66 and the second on-off valve 67, and also controls the opening and closing of the first on-off valve 76 and the second on-off valve 77, thereby adjusting the mixing ratio R of the fuel F and the oxidizer A in the combustible gas M supplied to the combustion device 11. For example, when the first on-off valve 66, the second on-off valve 67, the first on-off valve 76, and the second on-off valve 77 are opened, the mixing ratio of the fuel F and the oxidizer A in the combustible gas M becomes a predetermined mixing ratio R set in advance. Also, when the first on-off valve 66, the first on-off valve 76, and the second on-off valve 77 are opened and the second on-off valve 67 is closed, the mixing ratio of the fuel F and the oxidizer A in the combustible gas M becomes an excess of the oxidizer A with respect to the predetermined mixing ratio R. On the other hand, when the first on-off valve 66, the second on-off valve 67, and the first on-off valve 76 are opened and the second on-off valve 77 is closed, the mixing ratio of the fuel F and the oxidizer A in the combustible gas M becomes an excess of the fuel F with respect to the predetermined mixing ratio R.

[0048] Note that the maximum valve opening degrees of the first on-off valve 66 and the second on-off valve 67 may be set to different values, or the maximum valve opening degrees of the first on-off valve 76 and the second on-off valve 77 may be set to different values. Also, the fuel supply path 32 and the oxidizer supply path 42 are not limited to two branches and may be three or more branches.

[0049] By applying the sonic nozzle devices 61B and 71B as the fuel flow rate adjustment device and the oxidizer flow rate adjustment device, the instantaneous flow rate of the combustible gas M supplied from the combustible gas supply device 12B to the combustion device 11 can be appropriately adjusted.

[0050] [Fifth Embodiment] <Shock Wave Generation Device> FIG. 5 is a schematic configuration diagram showing the shock wave generation device of the fifth embodiment, and FIG. 6 is a front view of the shock wave generation device from the furnace side. Note that members having the same functions as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0051] As shown in FIGS. 5 and 6, the shock wave generation device 10C includes a combustion device 11, a combustible gas supply device 12, an ignition device 13, a control device 14, and an ejection unit 15.

[0052] The furnace 101 has a furnace wall 102. The furnace 101 has an internal space 103 partitioned by the inner wall surface 102a of the furnace wall 102. A heat transfer pipe that constitutes a heat exchanger (not shown) is disposed in the internal space 103 of the furnace 101. In the internal space 103 of the furnace 101, high-temperature exhaust gas G1 flows in a predetermined direction. The flow direction of the high-temperature exhaust gas G1 varies depending on the position of the internal space 103, the surrounding shape, etc. Hereinafter, the case where the high-temperature exhaust gas G1 rises in the internal space 103 will be described.

[0053] The combustion device 11 has a detonator 22 and a combustor 23A. The detonator 22 can supply the combustible gas M to the internal space 103 which is the target area. The detonator 22 has, for example, a cylindrical shape and the same inner diameter in the longitudinal direction. However, the detonator 22 is not limited to the cylindrical shape and may be a polygonal cylindrical shape. The detonator 22 has a combustible gas supply device 12 connected to one end portion in the axial direction and the combustor 23A connected to the other end portion.

[0054] The combustor 23A has a pipe 23Aa and an expansion pipe 23Ab, and is provided between the detonator 22 and the furnace wall 102 (internal space 103) of the furnace 101. The pipe 23Aa has a larger inner diameter on the furnace wall 102 side than the inner diameter of the detonator 22. The expansion pipe 23Ab continuously and uniformly expands in diameter from the pipe 23Aa side toward the furnace wall 102 (internal space 103) side. That is, one end portion in the axial direction of the expansion pipe 23Ab has the same diameter as the pipe 23Aa, and the base end portion of the pipe 23Aa is connected to the other end portion of the detonator 22. The expansion pipe 23Ab gradually expands in diameter from one end portion in the axial direction to the other end portion and is connected to the furnace wall 102. Since a reaction acts on the combustor 23A due to a shock wave caused by the detonation of the combustible gas M inside, the connection portion of the combustor 23A to the furnace wall 102 may be made movable.

[0055] The ejection portion 15 ejects the non-combustible gas N from the outer peripheral portion of the expansion pipe 23Ab in the combustor 23A toward the center portion side. The ejection portion 15 is provided on the other end portion side of the expansion pipe 23Ab, that is, on the furnace 101 (internal space 103) side.

[0056] The enlarged pipe 23Ab has an outer cylinder pipe 81 disposed on the outer side of the other end portion side. The outer cylinder pipe 81 has a cylindrical shape with a larger diameter than the enlarged pipe 23Ab, and like the enlarged pipe 23Ab, continuously and uniformly expands in diameter from one end portion in the axial direction toward the other end portion. The inner peripheral surface of the outer cylinder pipe 81 is disposed with a gap from the outer peripheral surface of the enlarged pipe 23Ab, and the outer peripheral surface is fitted and fixed to the through hole 102b of the furnace wall 102. Therefore, the other end portion side of the enlarged pipe 23Ab is disposed inside the furnace wall 102, and the entire outer cylinder pipe 81 is disposed inside the furnace wall 102. Note that the outer cylinder pipe 81 may also be movably connected to the furnace wall 102 in the same manner as the enlarged pipe 23Ab.

[0057] The outer cylinder pipe 81 has an outer cylinder portion 81a and a flange portion 81b. The outer cylinder portion 81a is disposed with a gap from the outer peripheral surface of the enlarged pipe 23Ab. The flange portion 81b is disposed on the other end portion side in the axial direction of the outer cylinder pipe 81. The outer peripheral portion is connected to the other end portion of the outer cylinder portion 81a, and the inner peripheral portion is connected to the other end portion of the enlarged pipe 23Ab. Therefore, a gas flow portion 82 having a cylindrical shape is formed between the enlarged pipe 23Ab and the outer cylinder pipe 81.

[0058] Also, a header 83 is disposed on one end portion side in the axial direction of the outer cylinder pipe 81. The header 83 has a ring shape and an L-shaped cross-sectional shape. One end portion in the width direction of the header 83 is fixed to the outer wall surface 102c of the furnace wall 102, and the other end portion is fixed to the outer peripheral surface of the enlarged pipe 23Ab. Therefore, the header 83 partitions a gas space portion 84 having a ring shape between the furnace wall 102 and the enlarged pipe 23Ab. The gas space portion 84 communicates with one end portion side of the gas flow portion 82. Note that the header 83 may also be movably connected to the furnace wall 102 in the same manner as the enlarged pipe 23Ab and the outer cylinder pipe 81. Also, the header 83 may be fixed to the outer cylinder pipe 81 to partition the gas space portion 84.

[0059] The ejection part 15 has a plurality (eight in this embodiment) of ejection holes 15a for ejecting non-combustible gas N. The plurality of ejection holes 15a are formed on the other end side in the axial direction in the combustor 23A, that is, on the side of the internal space 103 of the furnace 101. The plurality of ejection holes 15a are openings having a slit shape along the circumferential direction of the enlarged pipe 23Ab. However, the number of the ejection holes 15a is not limited. Further, the ejection holes 15a are not limited to the slit shape and may be circular holes.

[0060] The plurality of ejection holes 15a constituting the ejection part 15 eject the non-combustible gas N in an inclined direction inclined toward the internal space 103 side of the furnace 101 with respect to the radial direction of the enlarged pipe 23Ab. That is, one end of the enlarged pipe 23Ab has an increasing diameter toward the other end. The plurality of ejection holes 15a are holes penetrating in a direction orthogonal to the other end of the enlarged pipe 23Ab with an increasing diameter. Therefore, the plurality of ejection holes 15a eject the non-combustible gas N from the outer peripheral part of the combustor 23A toward the internal space 103 side.

[0061] By the way, the enlarged pipe 23Ab is set to a predetermined enlargement ratio set in advance. For example, when the inner diameter on one end side of the enlarged pipe 23Ab is R1 and the inner diameter on the other end side is R2, the area ratio (R2 / 2) 2 π / (R1 / 2) 2 π is preferably set to 1.4 to 4.0. Further, the enlarged pipe 23Ab is preferably set so that the angle α of the inner surface with respect to the center line is 10 degrees to 50 degrees. Further, the ejection holes 15a are preferably set so that the ejection angle β of the non-combustible gas N with respect to the radial direction of the enlarged pipe 23Ab is 0 degrees to 45 degrees.

[0062] The header 83 has one end of the gas supply line 86 connected thereto via the port 85. The gas supply line 86 has the gas supply source 87 connected to the other end thereof, and an on-off valve 88 is provided in the middle thereof. Here, the gas supply source 87 is, for example, a blower, a compressor, etc., and supplies air or compressed air as the non-combustible gas N. However, the gas supply source 87 is not limited to this configuration. For example, the non-combustible gas N may be a gas with an oxygen fraction lower than that of air or an inert gas (such as nitrogen or argon) instead of air, and the gas supply source 87 may be a tank for storing these gases, etc.

[0063] Therefore, when the control device 14 opens the on-off valve 88, the non-combustible gas N is supplied from the gas supply source 87 to the gas supply line 86 and then supplied to the gas space portion 84 via the port 85. The supplied non-combustible gas N in the gas space portion 84 flows through the gas flow portion 82 to the other end side of the combustor 23A and is ejected from the plurality of ejection holes 15a toward the center side of the combustor 23A.

[0064] <Operation of the shock wave generating device> In the furnace 101, when dust adheres to the inner wall surface 102a of the furnace wall 102 or the heat transfer tubes (not shown) of the heat exchanger due to long-term use, the dust removal device is operated. That is, the combustible gas M is supplied to and filled in the detonator 22 by the supply device, and the combustible gas M is ignited. Then, the combustible gas M burns inside the detonator 22 to generate a flame C and generates a shock wave S due to detonation. The generated shock wave S is transmitted to the internal space 103 through the detonator 22 and the combustor 23A, acts on the outer surface of the inner wall surface 102a of the furnace wall 102 and the heat transfer tubes, and the attached dust is blown off and removed. At this time, since the shock wave S due to detonation generated in the detonator 22 is transmitted to the internal space 103 of the furnace 101 through the expanding tube 23Ab with an expanding diameter, the supersonic flow ejected together with the blast wind is expanded at an appropriate area ratio, and the blast wind and the jet flow can be efficiently introduced into the internal space 103. When the dust attached to the inner wall surface 102a of the furnace wall 102 and the outer surface of the heat transfer tubes is removed by the dust removal device, the operation of the dust removal device is stopped.

[0065] When removing dust by the above-described dust removal device, the combustible gas M filled inside the detonator 22 or the combustor 23A may auto-ignite. Therefore, when the dust removal device is in operation, the ejection part 15 is operated. That is, the on-off valve 88 is opened, and the non-combustible gas N is supplied from the gas supply source 87 to the gas space part 84 through the gas supply line 86. Then, the non-combustible gas N filled in the gas space part 84 flows through the gas flow part 82 to the other end side of the combustor 23A and is ejected from the plurality of ejection holes 15a toward the central part side of the expansion pipe 23Ab.

[0066] At this time, the ejection part 15 forms an air curtain between the inside of the expansion pipe 23Ab and the internal space 103 of the furnace 101 by ejecting the non-combustible gas N from the plurality of ejection holes 15a toward the central part side of the combustor 23A. Since the air curtain of the non-combustible gas N partitions the inside of the expansion pipe 23Ab and the internal space 103, the internal space 103 is, for example, suppressed from the rising exhaust gas E entering the inside of the combustor 23A through the expansion pipe 23Ab. Therefore, the auto-ignition of the combustible gas M filled in the detonator 22 due to the contact with the high-temperature exhaust gas E is suppressed.

[0067] However, due to the flow velocity or uneven flow of the exhaust gas E rising in the internal space 103, a part of the exhaust gas E may pass through the air curtain of the non-combustible gas N and enter the expansion pipe 23Ab. At this time, since the inner diameter (area) of the expansion pipe 23Ab on the furnace wall 102 side is larger than that on the detonator 22 side, the exhaust gas E that has entered the expansion pipe 23Ab from the internal space 103 becomes a secondary flow N1 that swirls counterclockwise in FIG. 5 inside the expansion pipe 23Ab. Therefore, the exhaust gas E that has entered the expansion pipe 23Ab becomes the secondary flow N1, swirls and stays inside the expansion pipe 23Ab, and is less likely to flow toward the detonator 22 side, suppressing the auto-ignition of the combustible gas M filled in the detonator 22.

[0068] Even if a part of the exhaust gas E that has entered the expansion pipe 23Ab comes into contact with the combustible gas M that has filled the detonator 22, the temperature of the exhaust gas E decreases while flowing through the expansion pipe 23Ab. That is, the combustible gas M in the detonator 22 is mixed and diluted with the exhaust gas E whose temperature has decreased, and the concentration decreases without self-ignition. Therefore, even if the mixed gas of the combustible gas M and the exhaust gas E returns to the internal space 103 through the combustor 23A, the self-ignition of the combustible gas M is suppressed.

[0069] <Control of Shock Wave Generation Device> FIG. 7 is a flowchart showing a shock wave generation method by a shock wave generation device.

[0070] As shown in FIGS. 5 and 6, in step S10, the control device 14 opens the purge gas supply valve 55 and supplies the purge gas P to the combustion device 11. At this time, water may be sprayed to lower the internal temperature of the combustion device 11. Then, when generating a shock wave, in step S11, the control device 14 closes the purge gas supply valve 55 and stops the supply of the purge gas P to the combustion device 11. In step S12, the control device 14 opens the fuel supply valve 37 and starts the supply of the fuel F. In step S13, the control device 14 opens the oxidizer supply valve 47 and starts the supply of the oxidizer A. Then, the combustible gas M in which the fuel F and the oxidizer A are mixed is supplied to the detonator 22 of the combustion device 11.

[0071] In step S14, the control device 14 opens the on-off valve 88 and starts the supply of the non-combustible gas N. Then, the non-combustible gas N is ejected from the plurality of ejection holes 15a toward the central portion side of the combustor 23A, and forms an air curtain between the inside of the combustor 23A and the internal space 103 of the furnace 101. The air curtain of the non-combustible gas N partitions the inside of the combustor 23A and the internal space 103, and suppresses the exhaust gas E from entering the inside of the combustor 23A.

[0072] In step S15, the control device 14 determines whether or not a predetermined filling time Ta has elapsed since the start of the supply of the fuel F and the oxidant A, that is, the supply of the combustible gas M to the combustion device 11. The filling time Ta is set according to the filling amount of the combustible gas M to the combustion device 11. Here, if the control device 14 determines (No) that the filling time Ta has not elapsed, it waits as it is. On the other hand, if the control device 14 determines (Yes) that the filling time Ta has elapsed, in step S16, the control device 14 closes the fuel supply valve 37 to stop the supply of the fuel F. Then, in step S17, the control device 14 closes the oxidant supply valve 47 to stop the supply of the oxidant A.

[0073] In step S18, the control device 14 determines whether or not a predetermined ignition waiting time Tb has elapsed since the supply of the fuel F and the oxidant A was stopped, that is, the supply of the combustible gas M to the combustion device 11 was stopped. The ignition waiting time Tb is set in consideration of, for example, the operating time until the fuel supply valve 37 and the oxidant supply valve 47 are completely closed. Here, if the control device 14 determines (No) that the ignition waiting time Tb has not elapsed, it waits as it is. On the other hand, if the control device 14 determines (Yes) that the ignition waiting time Tb has elapsed, in step S19, the control device 14 operates the ignition device 13 to ignite the combustible gas M filled in the detonator 22. Then, in step 20, the combustible gas M staying in the first passage 24 of the detonator 22 is ignited, and the flame C burns so as to spread from the base end 22a to the tip end 22b. When the flame C of the detonator 22 reaches the combustor 23A, the flame C burns so as to spread from the base end 23a through the second passage 25 to the tip end 23b, and a shock wave S due to detonation is generated.

[0074] When the shock wave S is generated, since the flame C has disappeared, in step S21, the control device 14 closes the on-off valve 88 to stop the supply of the non-combustible gas N and releases the air curtain of the non-combustible gas N. Then, in step S22, the control device 14 opens the purge gas supply valve 55 to supply the purge gas P to the combustion device 11.

[0075] <Operation of the Shock Wave Generation Device> FIG. 8 is a time chart showing a shock wave generation method by the shock wave generation device.

[0076] At time t11, the supply of the purge gas P to the combustion device 11 is stopped, the supply of the fuel F to the combustion device 11 is started, and the supply of the oxidizer A to the combustion device 11 is started. Then, the combustible gas M in which the fuel F and the oxidizer A are mixed is supplied to the primer 22 of the combustion device 11. Further, the supply of the non-combustible gas N is started to form an air curtain between the inside of the combustor 23A and the internal space 103 of the furnace 101. In this state, a predetermined amount of the combustible gas M is filled inside the combustion device 11.

[0077] At time t12, when a predetermined filling time Ta has elapsed since the start of the supply of the combustible gas M, the supply of the fuel F to the combustion device 11 is stopped, and the supply of the oxidizer A to the combustion device 11 is stopped. Then, at time t13, when a predetermined ignition waiting time Tb has elapsed, the ignition device 13 ignites the combustible gas M filled in the primer 22. Then, the combustible gas M is ignited, the flame C spreads, and the shock wave S due to detonation is generated. When the shock wave S is generated, at time t14, the air curtain of the non-combustible gas N is released, and the purge gas P is supplied to the combustion device 11.

[0078] [Operation and Effect of the Present Embodiment] The shock wave generation device according to the first aspect includes a combustion device 11 provided with a gas passage 21 through which combustion gas flows from the base end toward the tip end and having an opening at the tip end, a fuel supply path 32 for supplying fuel, an oxidizer supply path 42 for supplying an oxidizer, a combustible gas supply path 52 for supplying the combustible gas M in which the fuel and the oxidizer are mixed to the combustion device 11, a fuel flow rate adjustment device for adjusting the flow rate of the fuel flowing through the fuel supply path 32, an oxidizer flow rate adjustment device for adjusting the flow rate of the oxidizer flowing through the oxidizer supply path 42, an ignition device 13 for igniting the combustible gas M supplied to the combustion device 11, and a control device 14 for controlling the fuel flow rate adjustment device and the oxidizer flow rate adjustment device according to the supply state of the combustible gas M supplied to the combustion device 11.

[0079] According to the shock wave generating device according to the first aspect, the fuel flow rate adjusting device and the oxidant flow rate adjusting device can adjust the instantaneous flow rate when the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11. When the combustible gas M is supplied to the combustion device 11, the mixing ratio of the fuel F and the oxidant A can be maintained constant with high precision, and a shock wave due to detonation can be generated with a stable intensity. Further, by adjusting the instantaneous flow rate of the combustible gas M by the fuel flow rate adjusting device and the oxidant flow rate adjusting device, an amount of the combustible gas M corresponding to the use of the shock wave can be supplied, the usage amounts of the fuel F and the oxidant A can be suppressed, and the running cost can be reduced. As a result, the accuracy of controlling the supply amount of the combustible gas M supplied to the combustion device 11 can be improved.

[0080] The shock wave generating device according to the second aspect is the shock wave generating device according to the first aspect, and further, the fuel flow rate adjusting device and the oxidant flow rate adjusting device include mass flow controllers 35 and 45. Thereby, even while the combustible gas M is being supplied to the combustion device 11, the mixing ratio of the fuel F and the oxidant A can be adjusted, and the mixing ratio can be appropriately adjusted according to the filling state of the combustible gas M in the combustion device 11.

[0081] The shock wave generating device according to the third aspect is the shock wave generating device according to the first aspect, and further, the fuel flow rate adjusting device and the oxidant flow rate adjusting device include sonic nozzles 61 and 71 or orifices. Thereby, the instantaneous flow rate can be robustly controlled to be constant without depending on electronic control.

[0082] The shock wave generating device according to the fourth aspect is the shock wave generating device according to any one of the first to third aspects, and further, the fuel flow rate adjusting device and the oxidant flow rate adjusting device are provided in parallel in the fuel supply path 32 and the oxidant supply path 42, respectively, with a plurality of fuel branch paths 62, 63 and a plurality of oxidant branch paths 72, 73, sonic nozzles 64, 65, 74, 75 provided in the plurality of fuel branch paths 62, 63 and the plurality of oxidant branch paths 72, 73, respectively, and on-off valves 66, 67, 77, 78 provided in the plurality of fuel branch paths 62, 63 and the plurality of oxidant branch paths 72, 73, respectively. Thereby, with a simple configuration, even during the supply of the combustible gas M to the combustion device 11, the mixing ratio of the fuel F and the oxidant A can be easily adjusted.

[0083] The shock wave generating device according to the fifth aspect is the shock wave generating device according to any one of the first to fourth aspects, and further, the control device 14 controls the fuel flow rate adjusting device and the oxidant flow rate adjusting device so that the mixing ratio of the combustible gas approaches the stoichiometric mixing ratio at the end of the filling time of the combustible gas M with respect to at least the combustion device 11. Thereby, the ignition device 13 can appropriately ignite and burn by igniting the combustible gas M filled in the combustion device 11, and generate a flame C.

[0084] The shock wave generating device according to the sixth aspect is the shock wave generating device according to the fourth or fifth aspect, and further, the control device 14 controls the fuel flow rate adjusting device and the oxidant flow rate adjusting device so that the mixing ratio of the combustible gas M becomes fuel-rich at the initial stage of the filling time of the combustible gas M with respect to the combustion device 11. Thereby, even if air remains inside the combustion device 11, by setting the mixing ratio of the combustible gas M to be fuel-rich at the initial stage of supply, finally, the mixing ratio of the combustible gas M inside the combustion device 11 can be adjusted to an appropriate value.

[0085] The shock wave generating device according to the seventh aspect is the shock wave generating device according to any one of the first to sixth aspects, and further includes an ejection unit 15 that ejects non-combustible gas N from the outer peripheral portion of the combustion device 11 toward the central portion side. As a result, since the inside of the combustion device 11 and the internal space 103 are partitioned by the air curtain of the non-combustible gas N, the intrusion of the exhaust gas E into the inside of the combustion device 11 can be suppressed, and the self-ignition of the combustible gas M filled in the combustion device 11 by the exhaust gas E can be suppressed. As a result, large valves and the like are not required, and an increase in component costs and maintenance costs can be suppressed. In addition, the air curtain of the non-combustible gas N that partitions the combustion device 11 and the internal space 103 only needs to be provided with the ejection unit 15 in the combustion device 11, and there is no possibility of malfunction even when it is arranged in a high-temperature environment, and the self-ignition of the combustible gas M can be appropriately suppressed.

[0086] The shock wave generating device according to the eighth aspect is the shock wave generating device according to the seventh aspect, and further, the ejection unit 15 ejects the non-combustible gas N while supplying the combustible gas M to the combustion device 11, and after igniting the combustible gas M supplied to the combustion device 11, stops the ejection of the non-combustible gas N. Thereby, the air curtain of the non-combustible gas N can be formed at an appropriate timing.

[0087] In the above-described embodiment, the shock wave generating device is applied to a dust removing device that removes dust adhering to the inner wall surface of a furnace such as a garbage incinerator, a coal gasification combined power generation facility, a power generation boiler, or the outer surface of a heat transfer tube. However, the application destination is not limited to these. The shock wave generating device is, for example, a propulsion engine that radiates a shock wave from the opening of a combustion device and receives the reaction force to generate thrust, a power engine that rotates a turbine, a device that radiates a shock wave from the opening of a combustor and exerts a physical action (such as destruction of a structure, separation of materials, etc.) on an object arranged near the opening using the high pressure of the shock wave, a device that exerts a physical action (such as destruction of a structure, separation of materials, etc.) on an object arranged inside a combustion device using the high pressure of the shock wave, etc.

Explanation of Signs

[0088] Shock wave generating devices 10, 10A, 10B, 10C Combustion device 11 Flammable gas supply devices 12, 12A, 12B Ignition device 13 Control device 14 Jetting part 15 Jetting hole 15a Gas passage 21 Initiator tube 22 Combustors 23, 23A First passage 24 Second passage 25 Mixing promoter 26 Fuel supply parts 31, 31A, 31B Fuel supply path 32 Fuel cylinder 33 Pressure reducing valve 34 Mass flow controller (fuel flow rate adjusting device) 35 Safety device 36 Fuel supply valve 37 Check valve 38 Oxidizer supply parts 41, 41A, 41B Oxidizer supply path 42 Oxidizer cylinder 43 Pressure reducing valve 44 Mass flow controller (oxidizer flow rate adjusting device) 45 Safety device 46 Oxidizer supply valve 47 Check valve 48 Cross joint 51 Flammable gas supply path 52 Purge gas path 53 Blower 54 Purge gas supply valve 55 Sonic nozzle (fuel flow rate adjusting device) 61 Sonic nozzle device (fuel flow rate adjusting device) 61B First fuel branch path 62 Second fuel branch path 63 First sonic nozzle 64 Second sonic nozzle 65 First on-off valve 66 Second on-off valve 67 71 Sonic nozzle (oxidant flow rate adjusting device) 71B Sonic nozzle device (oxidant flow rate adjusting device) 72 First oxidant branch path 73 Second oxidant branch path 74 First sonic nozzle 75 Second sonic nozzle 76 First on-off valve 77 Second on-off valve 81 Outer cylinder tube 82 Gas flow part 83 Header 84 Gas space part 85 Port 86 Gas supply line 87 Gas supply source 88 On-off valve 101 Furnace 102 Furnace wall 103 Internal space (target area) F Fuel A Oxidant M Combustible gas P Purge gas C Flame S Shock wave N Incombustible gas E Exhaust gas N1 Secondary flow

Claims

1. A combustion device provided with a gas passage through which combustion gas flows from the base end toward the tip end and having an opening at the tip end, a fuel supply path for supplying fuel, an oxidizer supply path for supplying an oxidizer, a combustible gas supply path for supplying the combustible gas in which the fuel and the oxidizer are mixed to the combustion device, a fuel flow rate adjusting device for adjusting the flow rate of the fuel flowing through the fuel supply path, an oxidizer flow rate adjusting device for adjusting the flow rate of the oxidizer flowing through the oxidizer supply path, an ignition device for igniting the combustible gas supplied to the combustion device, a control device for controlling the fuel flow rate adjusting device and the oxidizer flow rate adjusting device according to the supply state of the combustible gas supplied to the combustion device, comprising, the fuel flow rate adjusting device and the oxidizer flow rate adjusting device have mass flow controllers, the mass flow controller controls the opening degree of the flow rate control valve so that the mass flow rate becomes the set value by comparing the measured mass flow rate of the fuel or the oxidizer with the set value set according to the form of the combustion device, combustion information, etc., the control device controls the fuel flow rate adjusting device and the oxidizer flow rate adjusting device so that the mixing ratio of the combustible gas before being supplied to the combustion device becomes fuel-rich at the initial stage of the filling time of the combustible gas to the combustion device in a state where the inside of the combustion device is filled with purge gas, a shock wave generating device.

2. the fuel flow rate adjusting device and the oxidizer flow rate adjusting device have orifices or sonic nozzles, the shock wave generating device according to Claim 1.

3. the fuel flow rate adjusting device and the oxidizer flow rate adjusting device have a plurality of parallel fuel branch paths and a plurality of oxidizer branch paths provided in the fuel supply path and the oxidizer supply path respectively, the orifices or the sonic nozzles provided in the plurality of fuel branch paths and the plurality of oxidizer branch paths respectively, and on-off valves provided in the plurality of fuel branch paths and the plurality of oxidizer branch paths respectively, the shock wave generating device according to Claim 2.

4. the control device controls the fuel flow rate adjusting device and the oxidizer flow rate adjusting device so that the mixing ratio of the combustible gas approaches the stoichiometric mixing ratio at least at the end of the filling time of the combustible gas to the combustion device, the shock wave generating device according to any one of Claims 1 to 3.

5. It has a jetting part that jets non-combustible gas from the outer peripheral part of the combustion device toward the central part side. The shock wave generating device according to claim 1.

6. The jetting part jets the non-combustible gas while supplying combustible gas to the combustion device, stops jetting the non-combustible gas after igniting the combustible gas supplied to the combustion device. The shock wave generating device according to claim 5.

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