Shock wave generating device

Abstract

A shock wave generating device is provided with: a combustion device provided with a gas passage through which a combustion gas flows from a base end toward a tip end, and provided with an opening at the tip end; a fuel supply path for supplying fuel; an oxidant supply path for supplying an oxidant; a combustible gas supply path for supplying a combustible gas obtained by mixing a fuel and an oxidizing agent to the combustion device; a fuel flow rate adjustment device that adjusts the flow rate of the fuel flowing through the fuel supply path; an oxidant flow rate adjusting device for adjusting the flow rate of the oxidant flowing through the oxidant supply path; and an ignition device that ignites the combustible gas supplied to the combustion device.

Description

Technical Field

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

[0002] For example, dust contained in the exhaust gas of waste incinerators, coal gasification combined power plants (IGCC), power generation boilers, etc., adheres to the inner wall surface of the furnace and the outer surface of the heat transfer tube. The dust adhered to the inner wall surface of the furnace and the outer surface of the heat transfer tube reduces the heat transfer rate and deteriorates the heat recovery efficiency, or becomes a resistance to the flow of exhaust gas and reduces the performance of the furnace. Therefore, it is necessary to regularly remove the dust adhered 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 generated by explosion in which the propagation speed of flame 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 a device described in the following patent document.

[0004] Prior art literature

[0005] Patent Document 1: Japanese Patent No. 6600313 Summary of the invention

[0006] Problems to be solved by the invention

[0007] The shock wave generating device supplies a mixture of fuel and oxidant to a combustion chamber, and when a predetermined amount of the mixture is filled into the combustion chamber, the mixture is ignited. Thus, a shock wave caused by detonation is generated by the combustion of the mixture. In this case, when the mixture is supplied to the combustion chamber, the pressure of the pressure vessel upstream of the burner is monitored in order to find the total amount of the supplied mixture. However, in the process of supplying the mixture to the combustion chamber, since the pressure of the combustion chamber changes, the instantaneous flow rate at this time is unknown, and it becomes difficult for the mixer to control the flow rate of the combustion chamber with high precision.

[0008] The present disclosure is made to solve the above-mentioned problems, and an object of the present disclosure is to provide a shock wave generating device that can achieve high-precision control of the amount of combustible gas supplied to a combustion chamber.

[0009] Means for solving problems

[0010] The shock wave generating device disclosed in the present invention for achieving the above-mentioned purpose comprises: a combustion device, which is provided with a gas passage for combustion gas to flow from the base end toward the front end and is provided with an opening at the above-mentioned front end; a fuel supply path for supplying fuel; an oxidant supply path for supplying oxidant; a combustible gas supply path for supplying combustible gas mixed with the above-mentioned fuel and the above-mentioned oxidant to the above-mentioned combustion device; a fuel flow adjustment device for adjusting the flow rate of the above-mentioned fuel flowing in the above-mentioned fuel supply path; an oxidant flow adjustment device for adjusting the flow rate of the above-mentioned oxidant flowing in the above-mentioned oxidant supply path; and an ignition device for igniting the above-mentioned combustible gas supplied to the above-mentioned combustion device.

[0011] Effects of the Invention

[0012] According to the shock wave generating device of the present disclosure, it is possible to achieve high-precision control of the amount of combustible gas supplied to the combustion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic configuration diagram showing a shock wave generating device according to a first embodiment.

[0014] Figure 2 This is a graph showing the supply amount control of the combustible gas in the shock wave generating device according to the second embodiment.

[0015] Figure 3 It is a schematic configuration diagram showing a shock wave generating device according to a third embodiment.

[0016] Figure 4 It is a schematic configuration diagram showing a shock wave generating device according to a fourth embodiment.

[0017] Figure 5 It is a schematic structural diagram showing a shock wave generating device according to a fifth embodiment.

[0018] Figure 6 This is a front view showing the shock wave generating device as viewed from the furnace side.

[0019] Figure 7 : is a flowchart showing a shock wave generating method of the shock wave generating device.

[0020] Figure 8 It is a time chart showing a shock wave generating method of the shock wave generating device. DETAILED DESCRIPTION

[0021] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, the present disclosure is not limited to the embodiments, and in the case where there are multiple embodiments, a method of combining the embodiments is also included. In addition, the constituent elements in the embodiments include elements that can be easily thought of by those skilled in the art, substantially the same elements, and so-called elements of equivalent scope.

[0022] [First embodiment]

[0023] <Shock wave generating device>

[0024] Figure 1 It is a schematic configuration diagram showing a shock wave generating device according to a first embodiment.

[0025] like Figure 1 As shown, the shock wave generating device 10 of the first embodiment is applied to a dust removal device for removing dust adhering to the inner wall surface of the furnace and the outer surface of the heat transfer tube of a waste incinerator, a coal gasification combined power generation device, a power generation boiler (hereinafter referred to as a boiler), etc. In addition, the furnace is composed of a wall portion surrounding the combustion field of the boiler, but the dust removal device can remove dust adhering to the inner wall surface of the wall portion continuous with the upper and lower parts of the furnace. The dust removal device supplies combustible gas into the furnace through a pipe connected to the inside of the furnace, ignites the combustible gas, and thereby generates a shock wave S caused by detonation. That is, when the combustible gas burns, a detonation wave in which the flame and the shock wave are integrated propagates, and propagates as a shock wave at the time when the combustible gas disappears. The dust removal device blows away and removes the attached dust by causing the shock wave S caused by the detonation to act on the inner wall of the furnace and the outer surface of the heat transfer tube.

[0026] The shock wave generating device 10 is provided in the dust removing device, and generates the shock wave S by the detonation caused by the combustion of the fuel when the dust removing device is operated while the boiler is stopped.

[0027] 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 .

[0028] The combustion device 11 has a gas passage 21 for allowing combustion gas to flow from the base end to the front end. The combustion device 11 has a detonator 22 and a burner 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 burner 23.

[0029] The detonator 22 is in the shape of a cylinder, with a base end 22a closed and a front end 22b open. The detonator 22 is provided with a first passage 24 of a predetermined length inside. The detonator 22 is connected to the combustible gas supply device 12 at the base end 22a. The burner 23 is in the shape of a cylinder, with a base end 23a connected and communicated with the front end 22b of the detonator 22, and the front end 23b is open and provided with an opening 23c. The gas passage 21 of the detonator 22 is concentric with the second passage 25 of the burner 23. However, the gas passage 21 of the detonator 22 and the second passage 25 of the burner 23 may not be concentric, and may be of different shapes. The burner 23 is provided with a second passage 25 of a predetermined length inside. The diameter of the second passage 25 of the burner 23 is larger than the diameter of the first passage 24 of the detonator 22. The second passage 25 of the burner 23 has the same diameter from the base end 23a to the front end 22b, but the front end 22b may be enlarged relative to the base end 23a.

[0030] The detonator 22 is provided with a mixing promoter 26 at the base end 22a. The mixing promoter 26 promotes the mixing of the fuel F and the oxidant A. The mixing promoter 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 opening 23c of the front end 23b of the burner 23 is connected to the internal space 103 divided by the furnace wall 102 of the furnace 101.

[0031] The combustible gas supply device 12 includes a fuel supply unit 31 and an oxidant supply unit 41. The fuel supply unit 31 supplies fuel F. The oxidant supply unit 41 supplies oxygen or air as an oxidant A. The combustible gas supply device 12 supplies a mixed gas formed by mixing the fuel F supplied by the fuel supply unit 31 and the oxidant A supplied by the oxidant supply unit 41 as a combustible gas M from the base end of the combustion device 11 to the inside.

[0032] 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 adjustment device) 35, a safety device 36, a fuel supply valve 37, and a check valve 38. The fuel supply path 32 is connected to the fuel cylinder 33 at the upstream end, and is provided with a pressure reducing valve 34, a mass flow controller 35, a safety device 36, a fuel supply valve 37, and a check valve 38 toward the downstream side. The fuel cylinder 33 stores fuel F. The pressure reducing valve 34 reduces the pressure of the fuel F in the fuel cylinder 33 to adjust 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 value of the fuel F, and adjusts the opening of the flow control valve so that the mass flow rate of the fuel F becomes the set value. The safety device 36 prevents backfire. The fuel supply valve 37 is an on-off valve, which supplies fuel F when it is open and stops the supply of fuel F when it is closed. The check valve 38 prevents the fuel F and the combustible gas M from flowing back toward the upstream side.

[0033] The oxidant supply unit 41 includes an oxidant supply path 42, an oxidant gas cylinder 43, a pressure reducing valve 44, a mass flow controller (oxidant flow rate adjustment device) 45, a safety device 46, an oxidant supply valve 47, and a check valve 48. The oxidant supply path 42 is connected to the oxidant gas cylinder 43 at the upstream end, and is provided with a pressure reducing valve 44, a mass flow controller 45, a safety device 46, an oxidant supply valve 47, and a check valve 48 toward the downstream side. The oxidant gas cylinder 43 stores the oxidant A. The pressure reducing valve 44 reduces the pressure of the oxidant A in the oxidant gas cylinder 43 to adjust 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 the preset set value of the oxidant A, and adjusts the opening of the flow control valve so that the mass flow rate of the oxidant A becomes the set value. The safety device 46 prevents backfire. The oxidant supply valve 47 is an on-off valve, which supplies the oxidant A when it is opened, and stops the supply of the oxidant A when it is closed. The check valve 48 prevents the oxidant A and the combustible gas M from flowing back toward the upstream side.

[0034] The downstream ends of the fuel supply path 32 and the oxidant supply path 42 are connected to the upstream end of the combustible gas supply path 52 via the cross joint 51, and the downstream end of the combustible gas supply path 52 is connected to the base end 22a of the detonator 22. In addition, the purge gas path 53 is connected to the blower 54 at the upstream end, and the downstream end is connected to the cross joint 51. The purge gas path 53 is provided with a purge gas supply valve 55. The cross joint 51 connects 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 (for example, air, inert gas, etc.) P to the combustible gas supply path 52. The purge gas supply valve 55 is an on-off valve, which supplies the purge gas P when it is opened, and stops the supply of the purge gas P when it is closed.

[0035] The ignition device 13 ignites the combustible gas M supplied to the squib 22 in the combustion device 11 . The ignition device 13 is provided at the base end 22 a of the squib 22 .

[0036] The control device 14 is connected to 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 .

[0037] 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.

[0038] Here, the control device 14 is a controller, and is realized by, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like executing various programs stored in a storage unit using a RAM as a work area.

[0039] <Combustible gas flow rate adjustment control>

[0040] The mass flow controller 35 measures the mass flow rate of the fuel F flowing in 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 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, etc. and the combustion information. The mass flow controller 45 measures the mass flow rate of the oxidant A flowing in 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 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, etc. and the combustion information. In addition, the set value of the fuel F and the set value of the oxidant A can be set by adjusting the mass flow controllers 35 and 45 in advance, or can be set by the control device 14. The mixing ratio R of the combustible gas M is set according to the set value of the fuel F and the set value of the oxidant A.

[0041] The supply amount of the combustible gas M supplied by 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 valve 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 through the mass flow controllers 35 and 45, and controls the valve opening times of the fuel supply valve 37 and the oxidant supply valve 47. That is, by setting the set values ​​of the fuel F and the oxidant A through the mass flow controllers 35 and 45, the control device 14 can obtain the instantaneous supply amount (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.

[0042] By using 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 accuracy, and the shock wave generated by the detonation can be generated with a stable intensity. In addition, the controlled mixing ratio of the fuel F and the oxidant A 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.

[0043] In addition, by setting the set values ​​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 by the opening time of each fuel supply valve 37 and the oxidant supply valve 47. When the shock wave generating device 10 basically supplies a large amount of combustible gas M (fuel F), the intensity of the shock wave caused by the detonation becomes higher. However, for example, when the amount of dust 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 caused by the detonation. Therefore, the control device 14 adjusts the supply amount of the combustible gas M by the opening time of each fuel supply valve 37 and the oxidant supply valve 47, for example, it is sufficient to supply the combustible gas M (fuel F) in an amount corresponding to the amount of dust removed. Through such control, the use amount of fuel F and oxidant A can be suppressed, and the running cost can be reduced.

[0044] [Second embodiment]

[0045] Figure 2 FIG. 2 is a graph showing the control of the supply amount of combustible gas in the shock wave generating device of the second embodiment. The basic structure of the second embodiment is the same as that of the first embodiment described above. Figure 1 Components having the same functions as those in the first embodiment are described below, and the same reference numerals are given to components having the same functions as those in the first embodiment, and detailed descriptions thereof are omitted.

[0046] like Figure 1 As shown, 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. The control device 14 can adjust the supply amount of the combustible gas M to the combustion device 11 by adjusting the respective valve opening times of the fuel supply valve 37 and the oxidant supply valve 47. In addition, the respective set values ​​of the supply amount 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 respective set values ​​of the mass flow controllers 35 and 45 for the fuel F and the oxidant A.

[0047] 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 setting values ​​of the mass flow controllers 35 and 45 .

[0048] When the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11, the mixing ratio R of the combustible gas M may change due to external factors even though the setting values ​​of the mass flow controllers 35 and 45 are constant. For example, immediately before the shock wave generating device 10 is operated, the interior of the combustion device 11 is filled with the purge gas P. Here, when the purge gas P is air, the interior of the combustion device 11 is filled with air as an oxidant. Therefore, even if the combustible gas supply device 12 starts to supply the combustible gas M of a predetermined mixing ratio R to the combustion device 11, the oxidant (air) remaining in the combustion device 11 and the combustible gas M are mixed at the initial stage of supply, and the mixing ratio is reduced.

[0049] Therefore, at the initial stage of the supply of the combustible gas M by the combustible gas supply device 12 to the combustion device 11, the control device 14 changes the setting values ​​of the mass flow controllers 35 and 45 to change the mixing ratio R in which the fuel F is excessive. Here, the initial stage of the supply of the combustible gas M refers to a predetermined period set in advance from the opening period of the fuel supply valve 37 and the oxidant supply valve 47. Figure 1 and Figure 2 As shown, 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 to supply the combustible gas M to the combustion device 11. At this time, the control device 14 sets the setting values ​​of the mass flow controllers 35 and 45 to the mixing ratio R in which the fuel F is excessive. The control device 14 changes the setting values ​​of the mass flow controllers 35 and 45, for example, so that the initial mixing ratio (fuel / oxidant) Rg becomes a value obtained by multiplying the predetermined mixing ratio R set in advance by a coefficient a (1<a<10). Thus, at time t1, the initial mixing ratio Rg in which the fuel F is excessive is obtained.

[0050] The control device 14 maintains the initial mixture ratio Rg constant, for example, from time t1 to time t2. Furthermore, the control device 14 reduces the mixture ratio (fuel / oxidant) R from time t2 to time t3. The control device 14 reduces the fuel F from the excessive initial mixture ratio Rg to a predetermined mixture ratio R, for example, from time t2 to time t3. In this case, the mixture ratio R changes continuously, but it may also change in stages. Then, at time t3, the operation of the combustible gas supply device 12 is stopped and the fuel supply valve 37 and the oxidant supply valve 47 are closed, and at time t4, the supply of the combustible gas M ends.

[0051] In the above description, the initial mixture ratio Rg is maintained constant from time t1 to time t2, and the mixture ratio R is decreased from time t2 to time t3, but the present invention is not limited to this structure. 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. In addition, regarding the coefficient a and the degree of change for setting the initial mixture ratio Rg, the amount of residual air may be grasped in advance by CFD analysis or the like and provided as a sequence, or the amount of residual air may be measured inside the combustion device 11 by a measuring instrument (not shown) and feedback control may be applied to the mixture ratio R.

[0052] In addition, the ignition device 13 is arranged at the base end of the combustion device 11. Therefore, the ignition device 13 ignites the combustible gas M just before the supply of the combustion device 11 is completed. At this time, the ignition device 13 wants to reliably ignite the combustible gas M inside the combustion device 11. Therefore, at the end of the supply of the combustible gas M by the combustible gas supply device 12 to the combustion device 11, the control device 14 changes the setting values ​​of the mass flow controllers 35 and 45 to a mixture ratio R at which the ignition device 13 can easily ignite the combustible gas M. Here, the end of the supply refers to a predetermined period set in advance by going back from the stop period in the opening time 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 setting values ​​of the mass flow controllers 35 and 45 at the end of the supply of the combustible gas M, that is, at time t3, so that the mixture ratio R is close to the stoichiometric mixture ratio Rs, which is the ratio at which the fuel F and the oxidant A just react. The stoichiometric mixing ratio Rs is, for example, a value obtained by multiplying a predetermined mixing ratio set in advance by a coefficient b (0.3<b<3).

[0053] [Third Embodiment]

[0054] Figure 3 1 is a schematic diagram showing the structure of a shock wave generating device according to a third embodiment. Components 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.

[0055] 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 of the first embodiment.

[0056] 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 gas cylinder 33, a pressure reducing valve 34, a sonic nozzle (fuel flow rate regulating device) 61, a safety device 36, a fuel supply valve 37, and a check valve 38. In the second embodiment, the fuel flow rate regulating device is changed from the mass flow controller 35 of the first embodiment to a sonic nozzle 61. In addition, the oxidant supply unit 41A includes an oxidant supply path 42, an oxidant gas cylinder 43, a pressure reducing valve 44, a sonic nozzle (oxidant flow rate regulating device) 71, a safety device 46, an oxidant supply valve 47, and a check valve 48. In the second embodiment, the oxidant flow rate regulating device is changed from the mass flow controller 45 of the first embodiment to a sonic nozzle 71.

[0057] 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. In addition, the sonic nozzles 61 and 71 are provided as the fuel flow rate control means and the oxidant flow rate control means, but they may be orifices.

[0058] By using the sonic nozzles 61 and 71 or the throttle orifice as the fuel flow rate regulating device and the oxidant flow rate regulating 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.

[0059] [Fourth Embodiment]

[0060] Figure 4 1 is a schematic diagram showing the structure of a shock wave generating device according to a fourth embodiment. Components having the same functions as those of the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0061] 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 of the first embodiment.

[0062] 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 gas cylinder 33, a pressure reducing valve 34, a sonic nozzle device (fuel flow rate regulating device) 61B, a safety device 36, a fuel supply valve 37, and a check valve 38. In the third embodiment, the fuel flow rate regulating device is changed from the mass flow controller 35 of the first embodiment to a sonic nozzle device 61B. In addition, the oxidant supply unit 41B includes an oxidant supply path 42, an oxidant gas cylinder 43, a pressure reducing valve 44, a sonic nozzle device (oxidant flow rate regulating device) 71B, a safety device 46, an oxidant supply valve 47, and a check valve 48. In the third embodiment, the oxidant flow rate regulating device is changed from the mass flow controller 45 of the first embodiment to a sonic nozzle device 71B.

[0063] 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 provided with a first sonic nozzle 64 and a second sonic nozzle 65, a first opening and closing valve 66 and a second opening and closing valve 67, respectively. The control device 14 can perform opening and closing control on the first opening and closing valve 66 and the second opening and closing 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 provided with a first sonic nozzle 74 and a second sonic nozzle 75, a first opening and closing valve 76 and a second opening and closing valve 77, respectively. The control device 14 can perform opening and closing control on the first opening and closing valve 76 and the second opening and closing valve 77. In addition, the sonic nozzles 64, 65, 74, 75 may also be throttle holes.

[0064] The control device 14 controls the opening and closing of the first opening and closing valve 66 and the second opening and closing valve 67, and controls the opening and closing of the first opening and closing valve 76 and the second opening and closing valve 77, thereby adjusting the mixing ratio R of the fuel F and the oxidant A in the combustible gas M supplied to the combustion device 11. For example, when the first opening and closing valve 66 and the second opening and closing valve 67 and the first opening and closing valve 76 and the second opening and closing valve 77 are opened, the mixing ratio of the fuel F and the oxidant A in the combustible gas M becomes a predetermined mixing ratio R that is set in advance. In addition, when the first opening and closing valve 66, the first opening and closing valve 76 and the second opening and closing valve 77 are opened and the second opening and closing valve 67 is closed, the mixing ratio of the fuel F and the oxidant A in the combustible gas M becomes an excess of the oxidant A with respect to the predetermined mixing ratio R. On the other hand, when the first and second on-off valves 66, 67, and 76 are opened and the second on-off valve 77 is closed, the mixture ratio of the fuel F and the oxidant A in the combustible gas M becomes excessive with respect to the predetermined mixture ratio R.

[0065] In addition, the maximum valve openings of the first opening and closing valve 66 and the second opening and closing valve 67 may be set to different set values, or the maximum valve openings of the first opening and closing valve 76 and the second opening and closing valve 77 may be set to different set values. In addition, the fuel supply path 32 and the oxidant supply path 42 are not limited to two branches, and may be three or more branches.

[0066] By using the sonic nozzle devices 61B and 71B as the fuel flow rate control device and the oxidant flow rate control device, it is possible to appropriately control the instantaneous flow rate of the combustible gas M supplied from the combustible gas supply device 12B to the combustion device 11 .

[0067] [Fifth Embodiment]

[0068] <Shock wave generating device>

[0069] Figure 5 is a schematic structural diagram showing a shock wave generating device according to a fifth embodiment. Figure 6 1 is a front view showing the shock wave generating device as viewed from the furnace side. Components 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.

[0070] like Figure 5 and Figure 6 As shown, the shock wave generating device 10C includes a combustion device 11 , a combustible gas supply device 12 , an ignition device 13 , a control device 14 , and a jetting unit 15 .

[0071] The furnace 101 has a furnace wall 102. The furnace 101 has an internal space 103 divided by an inner wall surface 102a of the furnace wall 102. The furnace 101 is provided with heat transfer pipes constituting a heat exchanger (not shown) in the internal space 103. The internal space 103 of the furnace 101 allows high-temperature exhaust gas G1 to flow in a predetermined direction. The flow direction of the high-temperature exhaust gas G1 varies depending on the position of the internal space 103 and the shape of the surroundings. Hereinafter, the situation in which the high-temperature exhaust gas G1 rises in the internal space 103 will be described.

[0072] The combustion device 11 includes a detonator 22 and a burner 23A. The detonator 22 can supply the combustible gas M to the internal space 103 as the target area. The detonator 22 is, for example, cylindrical in shape, and the inner diameter is the same in the length direction. However, the detonator 22 is not limited to a cylindrical shape, and may also be a polygonal cylindrical shape. The detonator 22 is connected to the combustible gas supply device 12 at one end in the axial direction, and is connected to the burner 23A at the other end.

[0073] The burner 23A has a pipe 23Aa and an expansion pipe 23Ab, and is disposed between the detonator 22 and the furnace wall 102 (internal space 103) of the furnace 101. The inner diameter of the pipe 23Aa on the furnace wall 102 side is larger than the inner diameter of the detonator 22. The expansion pipe 23Ab expands in diameter continuously and uniformly from the pipe 23Aa side toward the furnace wall 102 (internal space 103) side. That is, one end of the expansion pipe 23Ab in the axial direction has the same diameter as the pipe 23Aa, and the base end of the pipe 23Aa is connected to the other end of the detonator 22. The diameter of the expansion pipe 23Ab gradually expands from one end in the axial direction toward the other end, and is connected to the furnace wall 102. In addition, since the burner 23A has a reaction due to the shock wave generated by the detonation of the internal combustible gas M, the burner 23A can also be moved freely relative to the connection portion of the furnace wall 102.

[0074] The ejection portion 15 ejects the incombustible gas N from the outer peripheral portion of the expansion pipe 23Ab in the burner 23A toward the central portion. 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.

[0075] The expansion tube 23Ab is provided with an outer tube 81 on the outside of the other end side. The outer tube 81 is in a cylindrical shape with a larger diameter than the expansion tube 23Ab, and expands continuously and evenly from one end to the other end in the axial direction, similarly to the expansion tube 23Ab. The inner circumference of the outer tube 81 is arranged with a gap between it and the outer circumference of the expansion tube 23Ab, and the outer circumference is fitted and fixed to the through hole 102b of the furnace wall 102. Therefore, the other end side of the expansion tube 23Ab is arranged inside the furnace wall 102, and the outer tube 81 is arranged entirely inside the furnace wall 102. In addition, the outer tube 81 can also be connected to the furnace wall 102 so as to be movably connected, similarly to the expansion tube 23Ab.

[0076] The outer tube 81 has an outer tube portion 81a and a flange portion 81b. The outer tube portion 81a is arranged with a gap between it and the outer peripheral surface of the expansion tube 23Ab. The flange portion 81b is arranged on the other end side of the outer tube 81 in the axial direction, and the outer peripheral portion is connected to the other end of the outer tube portion 81a, and the inner peripheral portion is connected to the other end of the expansion tube 23Ab. Therefore, a cylindrical gas flow portion 82 is formed between the expansion tube 23Ab and the outer tube 81.

[0077] In addition, a header 83 is arranged on one end side of the outer tube 81 in the axial direction. The header 83 is in a ring shape and has an L-shaped cross-section. One end of the header 83 in the width direction is fixed to the outer wall surface 102c of the furnace wall 102, and the other end is fixed to the outer peripheral surface of the fuel of the expansion tube 23Ab. Therefore, the header 83 divides a gas space portion 84 in a ring shape between the furnace wall 102 and the expansion tube 23Ab. The gas space portion 84 is connected to one end side of the gas flow portion 82. In addition, the header 83 can also be connected to the furnace wall 102 so as to be movably connected in the same manner as the expansion tube 23Ab and the outer tube 81. In addition, the header 83 can also be fixed to the outer tube 81 to divide the gas space portion 84.

[0078] The ejection portion 15 has a plurality of (eight in this embodiment) ejection holes 15a for ejecting the incombustible gas N. The plurality of ejection holes 15a are formed on the other end side of the burner 23A in the axial direction, that is, on the inner space 103 side of the furnace 101. The plurality of ejection holes 15a are openings in the shape of slits along the circumferential direction of the expansion tube 23Ab. However, the number of the ejection holes 15a is not limited. In addition, the ejection holes 15a are not limited to slit shapes, and may also be circular holes.

[0079] The plurality of ejection holes 15a constituting the ejection portion 15 eject the incombustible gas N in an inclined direction inclined toward the inner space 103 side of the furnace 101 relative to the radial direction of the expansion pipe 23Ab. That is, one end of the expansion pipe 23Ab expands toward the other end. The plurality of ejection holes 15a are holes that penetrate in a direction orthogonal to the other end of the expanded expansion pipe 23Ab. Therefore, the plurality of ejection holes 15a eject the incombustible gas N from the outer peripheral portion of the burner 23A toward the inner space 103 side.

[0080] However, the expansion tube 23Ab is set to a predetermined expansion ratio. For example, when the inner diameter of the expansion tube 23Ab at one end side is R1 and the inner diameter at the other end side is R2, it is preferably set to an area ratio (R2 / 2) 2 π / (R1 / 2) 2 π=1.4~4.0). In addition, the expansion tube 23Ab is preferably set to an angle α=10 degrees to 50 degrees relative to the center line of the inner surface. In addition, the ejection hole 15a is preferably set to an ejection angle β=0 degrees to 45 degrees of the incombustible gas N relative to the radial direction of the expansion tube 23Ab.

[0081] The manifold 83 is connected to one end of a gas supply line 86 via a port 85. The gas supply line 86 is connected to a gas supply source 87 at the other end, and an on-off valve 88 is provided in the middle. Here, the gas supply source 87 is, for example, a blower or a compressor, and supplies air or compressed air as the non-combustible gas N. However, the gas supply source 87 is not limited to this structure. For example, the non-combustible gas N may not be air, but may be a gas with a lower oxygen content than air or an inert gas (nitrogen or argon, etc.), and the gas supply source 87 may also be a tank for storing these gases.

[0082] 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 is supplied to the gas space portion 84 through the port 85. The non-combustible gas N supplied to the gas space portion 84 flows toward the other end side of the burner 23A in the gas flow portion 82, and is ejected from the plurality of ejection holes 15a toward the center side of the burner 23A.

[0083] <Function of shock wave generator>

[0084] In the furnace 101, when dust is attached to the inner wall surface 102a of the furnace wall 102 and the heat transfer tube (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 and filled to 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 a shock wave S caused by detonation is generated. The generated shock wave S is transmitted to the internal space 103 through the detonator 22 and the burner 23A, and acts on the inner wall surface 102a of the furnace wall 102 and the outer surface of the heat transfer tube, and the attached dust is blown away and removed. At this time, the shock wave S generated by the detonation generated in the detonator 22 is transmitted to the internal space 103 of the furnace 101 through the expansion tube 23Ab with an expanded diameter, so that the supersonic flow ejected together with the blast can be expanded at an appropriate area ratio, and the blast and the jet can be efficiently introduced into the internal space 103. When the dust adhering to the inner wall surface 102a of the furnace wall 102 and the outer surface of the heat transfer tube is removed by the dust removing device, the operation of the dust removing device is stopped.

[0085] When the dust is removed by the dust removal device described above, the combustible gas M filled in the detonator 22 or the burner 23A may spontaneously ignite. Therefore, when the dust removal device is operated, the ejection portion 15 is operated. That is, the on-off valve 88 is opened, and the incombustible gas N is supplied from the gas supply source 87 to the gas space portion 84 through the gas supply line 86. Then, the incombustible gas N filled in the gas space portion 84 flows toward the other end side of the burner 23A in the gas flow portion 82, and is ejected from the plurality of ejection holes 15a toward the center side of the expansion tube 23Ab.

[0086] At this time, the ejection portion 15 ejects the incombustible gas N from the plurality of ejection holes 15a toward the center of the burner 23A, thereby forming an air curtain between the inside of the expansion pipe 23Ab and the internal space 103 of the furnace 101. The air curtain of the incombustible gas N separates the inside of the expansion pipe 23Ab from the internal space 103, thereby suppressing, for example, the exhaust gas E that rises in the internal space 103 from penetrating into the inside of the burner 23A through the expansion pipe 23Ab. Therefore, the self-ignition of the combustible gas M filled in the detonator 22 caused by the contact of the high-temperature exhaust gas E is suppressed.

[0087] However, due to the flow velocity and bias 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 incombustible gas N and penetrate into the expansion tube 23Ab. At this time, the inner diameter (area) of the expansion tube 23Ab on the furnace wall 102 side is larger than that on the detonator 22 side, so the exhaust gas E that penetrates into the expansion tube 23Ab from the internal space 103 becomes a downward movement in the expansion tube 23Ab. Figure 5Therefore, the exhaust gas E entering the expansion tube 23Ab becomes the secondary flow N1 and rotates and stays in the expansion tube 23Ab, and is difficult to flow to the squib 22 side, so that the self-ignition of the combustible gas M filled in the squib 22 is suppressed.

[0088] In addition, even if a part of the exhaust gas E that has entered the expansion tube 23Ab contacts the combustible gas M filled in the detonator 22, the temperature of the exhaust gas E will decrease while flowing through the expansion tube 23Ab. That is, the combustible gas M in the detonator 22 is mixed with the exhaust gas E whose temperature has dropped and is diluted, and the concentration is reduced without spontaneous combustion. Therefore, even if the mixed gas formed by the combustible gas M and the exhaust gas E is returned to the internal space 103 through the burner 23A, the spontaneous combustion of the combustible gas M can be suppressed.

[0089] <Control of shock wave generating device>

[0090] Figure 7 : is a flowchart showing a shock wave generating method of the shock wave generating device.

[0091] like Figure 5 and Figure 6 As shown, 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. Furthermore, when the shock wave is generated, 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 oxidant supply valve 47 and starts the supply of the oxidant A. Thus, the combustible gas M formed by the mixture of the fuel F and the oxidant A is supplied to the detonator 22 of the combustion device 11.

[0092] In step S14, the control device 14 opens the on-off valve 88 to start supplying the incombustible gas N. Then, the incombustible gas N is ejected from the plurality of ejection holes 15a toward the center portion of the burner 23A, and an air curtain is formed between the inside of the burner 23A and the internal space 103 of the furnace 101. The air curtain of the incombustible gas N separates the inside of the burner 23A from the internal space 103, and suppresses the exhaust gas E from entering the inside of the burner 23A.

[0093] In step S15, the control device 14 determines whether a predetermined filling time Ta set in advance has passed since the supply of the fuel F and the oxidant A, that is, the supply of the combustible gas M to the combustion device 11 has started. 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 that the filling time Ta has not passed (no), it remains on standby. On the other hand, if the control device 14 determines that the filling time Ta has passed (yes), then in step S16, the control device 14 closes the fuel supply valve 37 and stops the supply of the fuel F. And, in step S17, the control device 14 closes the oxidant supply valve 47 and stops the supply of the oxidant A.

[0094] In step S18, the control device 14 determines whether a predetermined ignition waiting time Tb has passed since the supply of the fuel F and the oxidant A is stopped, that is, the supply of the combustible gas M to the combustion device 11 is stopped. The ignition waiting time Tb is set, for example, in consideration of 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 that the ignition waiting time Tb has not passed (no), the control device 14 stands by as it is. On the other hand, if the control device 14 determines that the ignition waiting time Tb has passed (yes), then 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 retained in the first passage 24 of the detonator 22 is ignited, and the flame C burns in a manner that spreads from the base end 22a to the front end 22b. Then, when the flame C of the squib 22 reaches the burner 23A, the flame C burns so as to spread from the base end 23a to the front end 23b through the second passage 25, thereby generating a shock wave S due to detonation.

[0095] When the shock wave S is generated, the flame C disappears, so in step S21 , the control device 14 closes the on-off valve 88 to stop the supply of the incombustible gas N and releases the air curtain of the incombustible gas N. Furthermore, 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 .

[0096] <Operation of the shock wave generating device>

[0097] Figure 8 It is a time chart showing a shock wave generating method of the shock wave generating device.

[0098] At time t11, the supply of the purge gas P to the burner 11 is stopped, the supply of the fuel F to the burner 11 is started, and the supply of the oxidant A to the burner 11 is started. Then, the combustible gas M formed by the mixture of the fuel F and the oxidant A is supplied to the detonator 22 of the burner 11. In addition, the supply of the incombustible gas N is started, and an air curtain is formed between the inside of the burner 23A and the internal space 103 of the furnace 101. In this state, a predetermined amount of the combustible gas M is filled into the inside of the burner 11.

[0099] At time t12, when the predetermined filling time Ta has passed since the start of supply of the combustible gas M, the supply of the fuel F to the burner 11 is stopped, and the supply of the oxidant A to the burner 11 is stopped. And, at time t13, when the predetermined ignition waiting time Tb has passed, the ignition device 13 ignites the combustible gas M filled in the detonator 22. Then, the combustible gas M is ignited, the flame C spreads, and a shock wave S caused by detonation is generated. When the shock wave S is generated, at time t14, the air curtain of the incombustible gas N is released, and the purge gas P is supplied to the burner 11.

[0100] [Effects of this embodiment]

[0101] The shock wave generating device of the first mode comprises: a combustion device 11, which is provided with a gas passage 21 for the combustion gas to flow from the base end toward the front end and is provided with an opening at the front end; a fuel supply path 32 for supplying fuel; an oxidant supply path 42 for supplying oxidant; a combustible gas supply path 52 for supplying the combustible gas M formed by a mixture of fuel and oxidant to the combustion device 11; a fuel flow regulating device for regulating the flow rate of the fuel flowing in the fuel supply path 32; an oxidant flow regulating device for regulating the flow rate of the oxidant flowing in the oxidant 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 regulating device and the oxidant flow regulating device according to the supply state of the combustible gas M supplied to the combustion device 11.

[0102] According to the shock wave generating device of the first embodiment, the instantaneous flow rate when the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11 can be adjusted by the fuel flow rate adjusting device and the oxidant flow rate adjusting device. 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 the shock wave generated by the detonation can be generated with a stable intensity. In addition, by adjusting the instantaneous flow rate of the combustible gas M using the fuel flow rate adjusting device and the oxidant flow rate adjusting device, the combustible gas M in an amount corresponding to the purpose of the shock wave can be supplied, and the usage of the fuel F and the oxidant A can be suppressed, and the running cost can be reduced. As a result, the supply amount of the combustible gas M supplied to the combustion device 11 can be controlled with high precision.

[0103] The shock wave generating device of the second embodiment is based on the shock wave generating device of the first embodiment, and further includes mass flow controllers 35 and 45. Thus, even in the process of supplying the combustible gas M 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.

[0104] The shock wave generating device of the third embodiment is based on the shock wave generating device of the first embodiment, and further, the fuel flow rate regulating device and the oxidant flow rate regulating device have sonic nozzles 61, 71 or orifices. Thus, the instantaneous flow rate can be controlled to be constant in a robust manner without relying on electronic control.

[0105] The shock wave generating device of the fourth mode is based on any shock wave generating device of the first mode to the third mode, and further, the fuel flow rate regulating device and the oxidant flow rate regulating device have: a plurality of parallel fuel branch paths 62, 63 and a plurality of oxidant branch paths 72, 73 respectively arranged in the fuel supply path 32 and the oxidant supply path 42; sonic nozzles 64, 65, 74, 75 respectively arranged in the plurality of fuel branch paths 62, 63 and the plurality of oxidant branch paths 72, 73; and opening and closing valves 66, 67, 77, 78 respectively arranged in the plurality of fuel branch paths 62, 63 and the plurality of oxidant branch paths 72, 73. Thus, even in the process of supplying the combustible gas M to the combustion device 11, the mixing ratio of the fuel F and the oxidant A can be easily adjusted with a simple structure.

[0106] The shock wave generating device of the fifth embodiment is based on any shock wave generating device of the first to fourth embodiments, and further, the control device 14 controls the fuel flow rate regulating device and the oxidant flow rate regulating device so that the mixing ratio of the combustible gas is close to the stoichiometric mixing ratio at least at the end of the filling time of the combustible gas M to be filled into the combustor 11. Thus, the ignition device 13 can ignite the combustible gas M filled in the combustor 11 appropriately and burn to generate the flame C.

[0107] The shock wave generating device of the sixth embodiment is based on the shock wave generating device of the fourth embodiment or the fifth embodiment, and further, the control device 14 controls the fuel flow rate regulating device and the oxidant flow rate regulating device so that the mixing ratio of the combustible gas M becomes excessive fuel at the initial stage of the filling time of the combustible gas M to fill the combustible gas M to the combustible gas 11. Thus, even if air remains inside the combustible gas 11, by setting the mixing ratio of the combustible gas M to be excessive fuel at the initial stage of supply, the mixing ratio of the combustible gas M inside the combustor 11 can be adjusted to an appropriate value in the end.

[0108] The shock wave generating device of the seventh embodiment is based on any of the shock wave generating devices of the first to sixth embodiments, and further has a jetting portion 15 that jets the incombustible gas N from the outer peripheral portion toward the central portion side of the combustion device 11. As a result, the interior of the combustion device 11 and the internal space 103 are separated by the air curtain of the incombustible gas N, so that the exhaust gas E can be suppressed from entering the interior of the combustion device 11, and the self-ignition of the combustible gas M filled in the combustion device 11 caused by the exhaust gas E can be suppressed. As a result, a large valve or the like is not required, and an increase in component cost and maintenance cost can be suppressed. In addition, the air curtain of the incombustible gas N that separates the combustion device 11 from the internal space 103 only needs to be provided with the jetting portion 15 in the combustion device 11, and even if it is arranged in a high temperature environment, no malfunction will occur, and the self-ignition of the combustible gas M can be appropriately suppressed.

[0109] The shock wave generating device of the eighth embodiment is based on the shock wave generating device of the seventh embodiment, and further, the ejection unit 15 ejects the incombustible gas N while supplying the combustible gas M to the combustion device 11, and stops ejecting the incombustible gas N after igniting the combustible gas M supplied to the combustion device 11. Thus, an air curtain of the incombustible gas N can be formed at an appropriate timing.

[0110] In addition, in the above-mentioned embodiment, the shock wave generating device is applied to a dust removal device for removing dust adhering to the inner wall surface of the furnace and the outer surface of the heat transfer tube of a garbage incinerator, a coal gasification combined power generation device, a power generation boiler, etc., but the application object is not limited to this. The shock wave generating device can be applied to, for example, a propulsion engine that radiates shock waves from the opening of a combustion device and forms thrust by the reaction force thereof, a power engine that rotates a turbine, a device that radiates shock waves from the opening of a burner and uses the high pressure of the shock waves to apply a physical effect (destruction of structures, separation of materials, etc.) to an object arranged near the opening, a device that uses the high pressure of the shock waves to apply a physical effect (destruction of structures, separation of materials, etc.) to an object arranged inside a combustion device, etc.

[0111] Description of Reference Numerals

[0112] 10, 10A, 10B, 10C Shock wave generating device

[0113] 11 Combustion device

[0114] 12, 12A, 12B Combustible gas supply device

[0115] 13 Ignition device

[0116] 14 Control Devices

[0117] 15. Ejection

[0118] 15a Spray hole

[0119] 21 Gas passage

[0120] 22 Detonator

[0121] 23, 23A burner

[0122] 24 First Access

[0123] 25 Second Path

[0124] 26 Mixing accelerator

[0125] 31, 31A, 31B Fuel supply unit

[0126] 32 Fuel supply path

[0127] 33 Fuel cylinder

[0128] 34 Pressure reducing valve

[0129] 35. Mass flow controller (fuel flow control device)

[0130] 36 Safety Device

[0131] 37 Fuel supply valve

[0132] 38 Check valve

[0133] 41, 41A, 41B Oxidant supply unit

[0134] 42 Oxidant supply path

[0135] 43 Oxidant Gas Cylinder

[0136] 44 Pressure reducing valve

[0137] 45. Mass flow controller (oxidant flow adjustment device)

[0138] 46 Safety Device

[0139] 47 Oxidant supply valve

[0140] 48 Check valve

[0141] 51 Cross Connector

[0142] 52 Combustible gas supply path

[0143] 53 Purge gas path

[0144] 54 Blower

[0145] 55 Purge gas supply valve

[0146] 61 Sonic nozzle (fuel flow control device)

[0147] 61B Sonic nozzle device (fuel flow control device)

[0148] 62 fuel branch path

[0149] 63 Fuel branch path

[0150] 64 First Sonic Nozzle

[0151] 65 Second Sonic Nozzle

[0152] 66 First on-off valve

[0153] 67 Second on-off valve

[0154] 71 Sonic nozzle (oxidant flow rate adjustment device)

[0155] 71B Sonic nozzle device (oxidant flow rate adjustment device)

[0156] 72 First oxidant branch path

[0157] 73 Second oxidant branch path

[0158] 74 First Sonic Nozzle

[0159] 75 Second Sonic Nozzle

[0160] 76 First on-off valve

[0161] 77 Second on-off valve

[0162] 81 outer bobbin

[0163] 82 Gas flow unit

[0164] 83 Headers

[0165] 84 Gas Space Department

[0166] Port 85

[0167] 86 Gas supply line

[0168] 87 Gas supply source

[0169] 88 On / Off Valve

[0170] 101 Furnace

[0171] 102 furnace wall

[0172] 103 Internal space (target area)

[0173] F Fuel

[0174] A. Oxidant

[0175] M Combustible gas

[0176] P Purge gas

[0177] C Flame

[0178] S Shockwave

[0179] N Non-flammable gas

[0180] E Exhaust

[0181] N1 Secondary flow.

Claims

1. A shock wave generating device, comprising: A combustion device having a gas passage for allowing combustion gas to flow from a base end toward a front end and having an opening at the front end; a fuel supply path for supplying fuel; an oxidant supply path for supplying an oxidant; a combustible gas supply path for supplying a combustible gas formed by mixing the fuel and the oxidant to the combustion device; a fuel flow rate regulating device for regulating the flow rate of the fuel flowing in the fuel supply path; an oxidant flow rate adjustment device for adjusting the flow rate of the oxidant flowing in the oxidant supply path; an ignition device for igniting the combustible gas supplied to the combustion device; and The control device controls the fuel flow rate control device and the oxidant flow rate control device according to the supply state of the combustible gas supplied to the combustion device.

2. The shock wave generating device according to claim 1, wherein: The fuel flow rate regulating device and the oxidant flow rate regulating device include mass flow controllers.

3. The shock wave generating device according to claim 1, wherein: The fuel flow rate regulating device and the oxidant flow rate regulating device have a throttle hole or a sonic nozzle.

4. The shock wave generating device according to claim 3, wherein: The fuel flow rate regulating device and the oxidant flow rate regulating device have: a plurality of parallel fuel branch paths and a plurality of oxidant branch paths respectively provided in the fuel supply path and the oxidant supply path; the throttle holes or the sonic nozzles respectively provided in the plurality of fuel branch paths and the plurality of oxidant branch paths; and opening and closing valves respectively provided on the plurality of fuel branch paths and the plurality of oxidant branch paths.

5. The shock wave generating device according to any one of claims 1 to 4, wherein: The control device controls the fuel flow rate adjustment device and the oxidant flow rate adjustment 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 fill the combustion device.

6. The shock wave generating device according to claim 5, wherein: The control device controls the fuel flow rate adjustment device and the oxidant flow rate adjustment device so that the mixing ratio of the combustible gas becomes fuel-excessive at the beginning of the filling time of the combustible gas to fill the combustion device.

7. The shock wave generating device according to claim 1, wherein: The shock wave generating device includes a jetting portion that jets incombustible gas from an outer peripheral portion toward a central portion of the combustion device.

8. The shock wave generating device according to claim 7, wherein: The ejection unit ejects the incombustible gas while supplying the combustible gas to the combustion device, and stops ejecting the incombustible gas after igniting the combustible gas supplied to the combustion device.

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