JP2024027346A - shock wave generator - Google Patents

Abstract

An object of the present invention is to improve the accuracy of controlling the amount of combustible gas supplied to a combustion device in a shock wave generation device. [Solution] A combustion device is provided with a gas passage through which combustion gas flows from a base end toward a distal end, and an opening is provided at the distal end, a fuel supply path that supplies fuel, and an oxidizer supply that supplies an oxidizer. a combustible gas supply route that supplies a combustible gas containing a mixture of fuel and oxidizer to the combustion device; a fuel flow rate adjustment device that adjusts the flow rate of fuel flowing through the fuel supply route; It includes an oxidizer flow rate adjustment device that adjusts the flow rate of the oxidizer, and an ignition device that ignites the combustible gas supplied to the combustion device. [Selection diagram] Figure 1

Description

The present disclosure relates to a shock wave generation device for generating shock waves due to detonation.

For example, in a garbage incinerator, an integrated coal gasification combined cycle (IGCC), a power generation boiler, and the like, dust contained in exhaust gas adheres to the inner wall surface of the furnace, the outer surface of the heat transfer tube, and the like. Dust that adheres to the inner wall surface of the furnace, the outer surface of the heat exchanger tubes, etc. reduces the heat transfer coefficient, worsening the heat recovery efficiency, and acts as a resistance to the flow of exhaust gas, reducing the performance of the furnace. Therefore, it is necessary to periodically remove dust adhering to the inner wall of the furnace and the outer surface of the heat exchanger tubes using a dust removal device.

The dust removal device includes a shock wave generating device. A shock wave generation device generates a shock wave by detonation in which the propagation speed of flame exceeds the speed of sound by burning fuel. The dust removal device removes dust using shock waves generated by the shock wave generation device. As such a conventional shock wave generation device, there is one described in the following patent documents.

Patent No. 6600313

The shock wave generator supplies a mixture of fuel and an oxidizer to a combustion chamber, and ignites the mixture when the combustion chamber is filled with a predetermined amount of the mixture. The air-fuel mixture then burns, creating a shock wave due to the detonation. In this case, when supplying the mixture to the combustion chamber, the pressure in the pressure vessel upstream of the combustor is monitored in order to determine the total amount of the supplied mixture. However, since the pressure in the combustion chamber fluctuates while the air-fuel mixture is being supplied to the combustion chamber, the instantaneous flow rate at this time is not known, making it difficult to control the flow rate of the mixer to the combustion chamber with high precision.

The present disclosure solves the above-mentioned problems, and aims to provide a shock wave generation device that achieves high precision control of the amount of combustible gas supplied to a combustion chamber.

A shock wave generating device of the present disclosure for achieving the above object includes a combustion device in which a gas passage through which combustion gas flows from a base end to a distal end and an opening is provided at the distal end; and a combustion device that supplies fuel. a supply route; an oxidizer supply route for supplying an oxidizer; a combustible gas supply route for supplying a combustible gas in which the fuel and the oxidizer are mixed to the combustion device; and the fuel flowing through the fuel supply route. a fuel flow rate adjustment device that adjusts the flow rate of the oxidizer flowing through the oxidizer supply path, an oxidizer flow rate adjustment device that adjusts the flow rate of the oxidizer flowing through the oxidizer supply path, and an ignition device that ignites the combustible gas supplied to the combustion device. , is provided.

According to the shock wave generation device of the present disclosure, it is possible to achieve high accuracy in controlling the amount of combustible gas supplied to the combustion device.

FIG. 1 is a schematic configuration diagram showing a shock wave generation device according to a first embodiment. FIG. 2 is a graph showing control of the supply amount of combustible gas in the shock wave generation device of the second embodiment. FIG. 3 is a schematic configuration diagram showing a shock wave generation device according to a third embodiment. FIG. 4 is a schematic configuration diagram showing a shock wave generation device according to the fourth embodiment. FIG. 5 is a schematic configuration diagram showing a shock wave generation device according to a fifth embodiment. FIG. 6 is a front view of the shock wave generation device from the furnace side. FIG. 7 is a flowchart illustrating a shock wave generation method by the shock wave generation device. FIG. 8 is a time chart showing a shock wave generation method by the shock wave generation device.

Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to this embodiment, and if there are multiple embodiments, the present disclosure also includes a configuration in which each embodiment is combined. In addition, the components in the embodiments include those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are in the so-called equivalent range.

[First embodiment]
<Shock wave generator>
FIG. 1 is a schematic configuration diagram showing a shock wave generation device according to a first embodiment.

As shown in FIG. 1, the shock wave generation device 10 of the first embodiment is applied to the inner wall surface of a furnace such as a garbage incinerator, a combined coal gasification combined cycle facility, a power generation boiler (hereinafter referred to as a boiler), and a heat exchanger tube. It is applied to dust removal equipment that removes dust that adheres to external surfaces. Incidentally, a furnace consists of a wall that surrounds the combustion field of the boiler, and the dust removal device removes dust that adheres to the inner wall surface of the wall that continues to the upper and lower parts of the furnace. be able to. The dust removal device supplies flammable gas into the furnace through a pipe communicating with the inside of the furnace, and ignites the flammable gas to generate a shock wave S due to detonation. That is, when combustible gas burns, a detonation wave, which is a combination of flame and shock wave, propagates, and when the combustible gas runs out, it propagates as a shock wave. The dust removal device blows away adhering dust by applying a shock wave S caused by the detonation to the inner wall of the furnace and the outer surface of the heat exchanger tube.

The shock wave generating device 10 is provided in a dust removal device, and generates a shock wave S by detonation caused by combustion of fuel when the dust removal device is activated while the boiler is stopped.

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

The combustion device 11 has a gas passage 21 through which combustion gas flows from the base end to the distal end. Combustion device 11 has a detonator 22 and a combustor 23. The gas passage 21 includes a first passage 24 provided inside the detonator 22 and a second passage 25 provided inside the combustor 23.

The detonator 22 has a cylindrical shape, with a base end 22a closed and a distal end 22b open. The detonator 22 is provided with a first passage 24 having a predetermined length inside. The combustible gas supply device 12 is connected to the base end 22a of the detonator 22. The combustor 23 has a cylindrical shape, a base end 23a is connected to and communicates with a tip 22b of the detonator 22, and the tip 23b is open to form an opening 23c. 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 having a predetermined length inside. The second passage 25 of the combustor 23 has a larger diameter than the first passage 24 of the squib 22 . In the combustor 23, the second passage 25 has the same diameter from the base end 23a to the distal end 22b, but the distal end 22b may have a larger diameter than the base end 23a.

The detonator 22 is provided with a mixing accelerator 26 at the base end 22a. The mixing promoter 26 promotes mixing of the fuel F and the oxidizer 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 combustor 23 has an opening 23c at a tip 23b communicating with an internal space 103 defined by a furnace wall 102 of the furnace 101.

The combustible gas supply device 12 includes a fuel supply section 31 and an oxidizer supply section 41. The fuel supply section 31 supplies fuel F. The oxidizing agent supply unit 41 supplies oxygen or air as the oxidizing agent A. The combustible gas supply device 12 supplies a mixture of the fuel F supplied by the fuel supply unit 31 and the oxidizer A supplied by the oxidizer supply unit 41 to the inside of the combustion device 11 from the base end of the combustion device 11 as a combustible gas M. supply to.

The fuel supply section 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. have A fuel cylinder 33 is connected to the upstream end of the fuel supply path 32, and a pressure reducing valve 34, a mass flow controller 35, a safety device 36, a fuel supply valve 37, and a check valve 38 are provided 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 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 value of the fuel F, and controls the flow rate so that the mass flow rate of the fuel F becomes the set value. Adjust the valve opening. The safety device 36 prevents backfire. The fuel supply valve 37 is an on-off valve, supplies fuel F when opened, and stops supplying fuel F when closed. The check valve 38 prevents backflow of the fuel F and combustible gas M to the upstream side.

The oxidizing agent supply section 41 includes an oxidizing agent supply path 42, an oxidizing agent cylinder 43, a pressure reducing valve 44, a mass flow controller (oxidizing agent flow rate adjustment device) 45, a safety device 46, an oxidizing agent supply valve 47, and a reverse It has a stop valve 48. The oxidizing agent supply path 42 has an oxidizing agent cylinder 43 connected to its upstream end, and is provided with a pressure reducing valve 44, a mass flow controller 45, a safety device 46, an oxidizing agent supply valve 47, and a check valve 48 toward the downstream side. The oxidizing agent cylinder 43 stores the oxidizing agent A. The pressure reducing valve 44 reduces the pressure of the oxidizing agent A in the oxidizing agent cylinder 43 and adjusts the pressure of the oxidizing agent A to be supplied. The mass flow controller 45 measures the mass flow rate of the oxidizing agent A, compares the measured mass flow rate of the oxidizing agent A with a preset value of the oxidizing agent A, and the mass flow rate of the oxidizing agent A becomes the set value. Adjust the opening of the flow control valve as follows. The safety device 46 prevents backfire. The oxidizing agent supply valve 47 is an on-off valve that supplies oxidizing agent A when opened and stops supplying oxidizing agent A when closed. The check valve 48 prevents backflow of the oxidizing agent A and the combustible gas M to the upstream side.

The downstream ends of the fuel supply route 32 and the oxidizer supply route 42 are connected to the upstream end of the combustible gas supply route 52 via a cross joint 51, and the combustible gas supply route 52 has a downstream end connected to the detonator. The base end 22a of 22 is connected to the base end 22a. Further, the purge gas path 53 has an upstream end connected to a blower 54 and a downstream end 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 oxidizer supply path 42, the combustible gas supply path 52, and the purge gas path 53. The blower 54 supplies purge gas (eg, air, inert gas, etc.) P to the combustible gas supply path 52. The purge gas supply valve 55 is an on-off valve, supplies purge gas P when opened, and stops supplying purge gas P when closed.

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 base end 22a of the detonator 22.

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 oxidizing agent supply valve 47 , and the purge gas supply valve 55 .

The control device 14 can control the timing of ignition 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 control opening and closing of the fuel supply valve 37, the oxidizer supply valve 47, and the purge gas supply valve 55.

Here, the control device 14 is a controller, and for example, various programs stored in a storage section are executed by a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) using a RAM as a work area. Realized.

<Flammable gas flow rate adjustment control>
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 a set value of the fuel F, and controls the flow rate so that the mass flow rate of the fuel F becomes the set value. Adjust the valve opening. The set value of the fuel F is set according to the configuration of the combustion device 11 and the like, combustion information, and the like. 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 a set value of the oxidant A, and determines whether the mass flow rate of the oxidant A matches the set value. Adjust the opening of the flow control valve so that The set value of the oxidizer A is set according to the configuration of the combustion device 11 and the like, combustion information, and the like. Note that the set value of the fuel F and the set value of the oxidizer A may be set by adjusting the mass flow controllers 35 and 45 in advance, or may be set by the control device 14. The mixture ratio R of the combustible gas M is set by the set value of the fuel F and the set value of the oxidizer A.

The supply amount of the combustible gas M that the combustible gas supply device 12 supplies to the combustion device 11 is based on the respective set values of the fuel F and the oxidizer A set in the mass flow controllers 35 and 45, the fuel supply valve 37 and the oxidizer It is determined by each valve opening time of the supply valve 47. The control device 14 sets the respective set values of the fuel F and the oxidizer A in the mass flow controllers 35 and 45, and controls the opening times of the fuel supply valve 37 and the oxidizer supply valve 47. That is, by setting each setting value of fuel F and oxidizer A in the mass flow controllers 35 and 45, the control device 14 can control that the combustible gas supply device 12 is supplying the combustible gas M to the combustion device 11. At this time, the instantaneous supply amount (mixing ratio) of fuel F and oxidizer A can be obtained.

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 oxidizer A can be maintained constant with high precision, and a shock wave due to detonation can be generated with stable intensity. . Note that the mixing ratio of fuel F and oxidizer A to be controlled varies depending on the combination of fuel F and oxidizer A, but is in the range of R (molar ratio) = 0.001 to 20.

Further, by setting the respective set values of the fuel F and the oxidizer A by the mass flow controllers 35 and 45, the control device 14 controls the combustible gas M supply amount can be adjusted. Basically, when the shock wave generating device 10 is supplied with a large amount of combustible gas M (fuel F), the intensity of the shock wave caused by detonation becomes higher. However, for example, when the amount of dust to be removed is small, there is no need to increase the amount of combustible gas M (fuel F) supplied 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 according to the opening times of the fuel supply valve 37 and the oxidizer supply valve 47, and, for example, adjusts the supply amount of the combustible gas M according to the amount of dust to be removed. (Fuel F) may be supplied. Through such control, the amount of fuel F and oxidizer A used can be suppressed, and running costs can be lowered.

[Second embodiment]
FIG. 2 is a graph showing control of the supply amount of combustible gas in the shock wave generation device of the second embodiment. Note that the basic configuration of the second embodiment is the same as that of the first embodiment described above, and will be explained using FIG. A detailed explanation will be omitted.

As shown in FIG. 1, the shock wave generation 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 amount of combustible gas M supplied to the combustion device 11 by adjusting the opening times of the fuel supply valve 37 and the oxidizer supply valve 47. Furthermore, the mass flow controllers 35 and 45 set respective set values for the supply amounts of fuel F and oxidizer A per unit time. The control device 14 can adjust the mixing ratio R of the fuel F and the oxidizer A in the combustible gas M by changing the respective set values of the fuel F and the oxidizer A by the mass flow controllers 35 and 45.

When the combustible gas supply device 12 is supplying the combustible gas M to the combustion device 11, the control device 14 controls the mixture ratio R of the combustible gas M by changing the set values of the mass flow controllers 35 and 45. adjust.

When the combustible gas supply device 12 is supplying the combustible gas M to the combustion device 11, although the set values of the mass flow controllers 35 and 45 are constant values, the mixing ratio of the combustible gas M may change due to external factors. R may fluctuate. For example, the inside of the combustion device 11 is filled with purge gas P until immediately before the shock wave generation device 10 is activated. Here, when the purge gas P is air, the interior of the combustion device 11 is filled with air, which is an oxidizing agent. Therefore, even if the combustible gas supply device 12 starts supplying the combustible gas M at a predetermined mixture ratio R to the combustion device 11, in the initial stage of supply, the oxidizer (air) remaining in the combustion device 11 and the combustible gas This results in the mixing of the toxic gases M, resulting in a decrease in the mixing ratio.

Therefore, at the beginning of the supply of 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, and adjusts the mixture ratio R such that the fuel F becomes excessive. change. Here, the initial period of supply of the combustible gas M is a predetermined period from when the fuel supply valve 37 and the oxidizer supply valve 47 are opened. 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 oxidizer supply valve 47, thereby supplying combustible gas to the combustion device 11. The supply of sexual gas M is started. At this time, the control device 14 sets the set values of the mass flow controllers 35 and 45 to a mixture ratio R at which the fuel F becomes excessive. For example, the control device 14 controls the mass flow controller 35 so that the initial mixture ratio (fuel/oxidant) Rg becomes a value obtained by multiplying a predetermined mixture ratio R by a coefficient a (1<a<10). , 45 settings. Then, at time t1, the initial mixture ratio Rg becomes such that the fuel F becomes excessive.

The control device 14 maintains the initial mixture ratio Rg constant from time t1 to time t2, for example. Then, the control device 14 decreases the mixture ratio (fuel/oxidizer) R from time t2 to time t3. For example, the control device 14 reduces the initial mixture ratio Rg, at which the fuel F becomes excessive, to a predetermined mixture ratio R from time t2 to time t3. In this case, the mixing ratio R is changed continuously, but it may be changed stepwise. Thereafter, at time t3, the operation of combustible gas supply device 12 is stopped and fuel supply valve 37 and oxidizer supply valve 47 are closed, and at time t4, the supply of combustible gas M ends.

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 the configuration is not limited to this. For example, from time t1 to time t3, the initial mixing ratio Rg is reduced to mixing ratio R, from time t1 to time t2, the initial mixing ratio Rg is reduced to mixing ratio R, and from time t2 to time t3, the initial mixing ratio Rg is reduced to mixing ratio R, and from time t2 to time t3, , the mixing ratio R may be maintained constant. Further, the coefficient a and the degree of change for setting the initial mixture ratio Rg may be given as a sequence by determining the amount of residual air in advance through CFD analysis, or by measuring the amount of residual air inside the combustion device 11. The mixture ratio R may be measured by a device (not shown) and feedback control may be applied to the mixture ratio R.

Further, 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 immediately before the end of supply to the combustion device 11 . At this time, it is desired that the ignition device 13 steadily ignites the combustible gas M inside the combustion device 11. Therefore, at the end of the supply of 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, and the ignition device 13 ignites the combustible gas M. Change the mixing ratio R to an easier one. Here, the end of supply is a predetermined period set in advance from the stop timing of the opening time of the fuel supply valve 37 and the oxidizer supply valve 47, which is set according to the amount of combustible gas M filled into the combustion device 11. It is a period. That is, at time t3, which is the end of the supply of combustible gas M, the control device 14 sets the mixture ratio R to be around the stoichiometric mixture ratio Rs, which is the ratio at which the fuel F and the oxidizer A react in just the right amount. Then, the set values of the mass flow controllers 35 and 45 are changed. 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).

[Third embodiment]
FIG. 3 is a schematic configuration diagram showing a shock wave generation device according to a third embodiment. Note that members having the same functions as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

The shock wave generation 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.

The combustible gas supply device 12A includes a fuel supply section 31A and an oxidizing agent supply section 41A. The fuel supply section 31A includes a fuel supply path 32, a fuel cylinder 33, a pressure reducing valve 34, a sonic nozzle (fuel flow rate adjustment device) 61, a safety device 36, a fuel supply valve 37, and a check valve 38. have In the second embodiment, the mass flow controller 35 of the first embodiment is replaced with a sonic nozzle 61 as the fuel flow rate adjusting device. The oxidizing agent supply section 41A also includes an oxidizing agent supply path 42, an oxidizing agent cylinder 43, a pressure reducing valve 44, a sonic nozzle (oxidizing agent flow rate adjustment device) 71, a safety device 46, and an oxidizing agent supply valve 47. , and a check valve 48. In the second embodiment, the mass flow controller 45 of the first embodiment is replaced with a sonic nozzle 71 as the oxidant flow rate adjusting device.

The sonic nozzles 61 and 71 are not controlled by the control device 14, and the respective set values of the fuel F and the oxidizer A are set in advance. Note that although the sonic nozzles 61 and 71 are provided as the fuel flow rate adjustment device and the oxidant flow rate adjustment device, orifices may also be used.

By applying the sonic nozzles 61, 71 and orifices as the fuel flow rate adjustment device and the oxidizing agent flow rate adjustment device, the instantaneous flow rate of the combustible gas M supplied to the combustion device 11 by the flammable gas supply device 12A is appropriately adjusted. be able to.

[Fourth embodiment]
FIG. 4 is a schematic configuration diagram showing a shock wave generation device according to the fourth embodiment. Note that members having the same functions as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

The shock wave generation 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.

The combustible gas supply device 12B includes a fuel supply section 31B and an oxidizer supply section 41B. The fuel supply section 31B includes a fuel supply path 32, a fuel cylinder 33, a pressure reducing valve 34, a sonic nozzle device (fuel flow rate adjustment device) 61B, a safety device 36, a fuel supply valve 37, and a check valve 38. has. In the third embodiment, the mass flow controller 35 of the first embodiment is replaced with a sonic nozzle device 61B as the fuel flow rate adjusting device. The oxidizing agent supply section 41B also includes an oxidizing agent supply path 42, an oxidizing agent cylinder 43, a pressure reducing valve 44, a sonic nozzle device (oxidizing agent flow rate adjustment device) 71B, a safety device 46, and an oxidizing agent supply valve 47. and a check valve 48. In the third embodiment, the mass flow controller 45 of the first embodiment is changed to a sonic nozzle device 71B as the oxidant flow rate adjusting device.

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, a second sonic nozzle 65, a first on-off valve 66, and a second on-off valve 67, respectively. The control device 14 can control opening and closing of the first on-off valve 66 and the second on-off valve 67. In the sonic nozzle device 71B, the oxidizer supply path 42 is provided with a first oxidizer 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, a second sonic nozzle 75, a first on-off valve 76, and a second on-off valve 77, respectively. The control device 14 can control 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.

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 controlling the flammable gas M supplied to the combustion device 11. The mixing ratio R of fuel F and oxidizer A can be adjusted. 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 mixture ratio of the fuel F and the oxidizer A in the combustible gas M is set in advance. A predetermined mixing ratio R is obtained. Moreover, 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 mixture ratio of the fuel F and the oxidizer A in the combustible gas M is The oxidizing agent A becomes excessive 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 mixture ratio of the fuel F and the oxidizer A in the combustible gas M is Fuel F becomes excessive with respect to the predetermined mixture ratio R.

Note that the maximum valve openings of the first on-off valve 66 and the second on-off valve 67 may be set to different values, or the maximum valve openings of the first on-off valve 76 and the second on-off valve 77 may be set to different values. You can. Further, the fuel supply route 32 and the oxidizer supply route 42 are not limited to two branches, but may be three or more branches.

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 to the combustion device 11 by the combustible gas supply device 12B can be appropriately adjusted. Can be done.

[Fifth embodiment]
<Shock wave generator>
FIG. 5 is a schematic configuration diagram showing the shock wave generation device of the fifth embodiment, and FIG. 6 is a front view showing 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 designated by the same reference numerals, and detailed description thereof will be omitted.

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 section 15.

The furnace 101 has a furnace wall 102. The furnace 101 has an internal space 103 defined by an inner wall surface 102a of the furnace wall 102. In the furnace 101, heat transfer tubes constituting a heat exchanger (not shown) are arranged in an internal space 103. In the internal space 103 of the furnace 101, high-temperature exhaust gas G1 flows in a predetermined direction. Although the flow direction of the high-temperature exhaust gas G1 varies depending on the position of the internal space 103 and the surrounding shape, a case in which the high-temperature exhaust gas G1 rises in the internal space 103 will be described below.

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

The combustor 23A has a pipe 23Aa and an expansion tube 23Ab, and is provided between the blast tube 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 tube 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 of the expansion tube 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 tube 22. The expansion tube 23Ab has a diameter that gradually increases from one end in the axial direction to the other end, and is connected to the furnace wall 102. In addition, since the combustor 23A receives a reaction due to the shock wave caused by the detonation of the combustible gas M inside, the connecting portion of the combustor 23A to the furnace wall 102 may be made movable.

The ejection part 15 ejects nonflammable gas N from the outer circumference of the expansion tube 23Ab in the combustor 23A toward the center. The ejection part 15 is provided on the other end side of the expansion tube 23Ab, that is, on the furnace 101 (internal space 103) side.

The expansion tube 23Ab has an outer cylinder tube 81 disposed on the outside of the other end. The outer cylindrical tube 81 has a cylindrical shape with a larger diameter than the expansion tube 23Ab, and similarly to the expansion tube 23Ab, the diameter continuously and uniformly increases from one end in the axial direction to the other end. The outer cylindrical tube 81 is arranged such that its inner circumferential surface is spaced from the outer circumferential surface of the expansion tube 23Ab, and its outer circumferential surface is fitted and fixed into the through hole 102b of the furnace wall 102. Therefore, the other end of the expansion tube 23Ab is placed inside the furnace wall 102, and the entire outer cylindrical tube 81 is placed inside the furnace wall 102. Note that the outer cylindrical tube 81 may also be movably connected to the furnace wall 102 similarly to the expansion tube 23Ab.

The outer cylindrical tube 81 has an outer cylindrical portion 81a and a flange portion 81b. The outer cylinder portion 81a is arranged with a gap spaced from the outer circumferential surface of the expansion tube 23Ab. The flange portion 81b is disposed on the other end side of the outer tube 81 in the axial direction, and has an outer peripheral portion connected to the other end of the outer tube portion 81a, and an inner peripheral portion connected to the other end of the expansion tube 23Ab. Ru. Therefore, a cylindrical gas flow section 82 is formed between the expansion tube 23Ab and the outer cylindrical tube 81.

Further, a header 83 is disposed at one end of the outer cylindrical tube 81 in the axial direction. The header 83 has a ring shape and an L-shaped cross section. The header 83 has one end in the width direction fixed to the outer wall surface 102c of the furnace wall 102, and the other end fixed to the outer peripheral surface of the expansion tube 23Ab. Therefore, the header 83 defines a ring-shaped gas space 84 between the furnace wall 102 and the expansion tube 23Ab. The gas space 84 communicates with one end of the gas flow section 82 . Note that the header 83 may also be movably connected to the furnace wall 102, like the expansion tube 23Ab and the outer tube 81. Alternatively, the header 83 may be fixed to the outer tube 81 to define the gas space 84.

The ejection part 15 has a plurality of (eight in this embodiment) ejection holes 15a that eject nonflammable gas N. The plurality of ejection holes 15a are formed on the other end side of the combustor 23A in the axial direction, that is, on the inner space 103 side of the furnace 101. The plurality of ejection holes 15a are slit-shaped openings along the circumferential direction of the expansion tube 23Ab. However, the number of ejection holes 15a is not limited. Moreover, the ejection hole 15a is not limited to the slit shape but may be a circular hole.

The plurality of ejection holes 15a constituting the ejection part 15 eject nonflammable gas N in an inclined direction that is inclined toward the internal space 103 of the furnace 101 with respect to the radial direction of the expansion tube 23Ab. That is, one end of the expansion tube 23Ab expands in diameter toward the other end. The plurality of ejection holes 15a are holes that penetrate in a direction perpendicular to the other end of the expanding tube 23Ab whose diameter is expanded. Therefore, the plurality of ejection holes 15a eject nonflammable gas N from the outer circumference of the combustor 23A toward the internal space 103 side.

By the way, the expansion tube 23Ab is set to a predetermined expansion ratio that is set in advance. For example, when the expansion tube 23Ab has an inner diameter R1 at one end and an inner diameter R2 at the other end, the area ratio (R2/2) ² π/(R1/2) ² π = 1.4 to 4.0. It is preferable to set Further, it is preferable that the inner surface of the expansion tube 23Ab is set at an angle α of 10 degrees to 50 degrees with respect to the center line. Further, it is preferable that the ejection hole 15a is set at an ejection angle β of the nonflammable gas N from 0 degrees to 45 degrees with respect to the radial direction of the expansion tube 23Ab.

The header 83 is connected to one end of a gas supply line 86 via a port 85 . The other end of the gas supply line 86 is connected to a gas supply source 87, 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 nonflammable gas N. However, the gas supply source 87 is not limited to this configuration. For example, the nonflammable gas N may be a gas with a lower oxygen fraction than air or an inert gas (nitrogen, argon, etc.) instead of air, and the gas supply source 87 may be a tank for storing these gases.

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

<Operation of shock wave generator>
In the furnace 101, when dust adheres to the inner wall surface 102a of the furnace wall 102, the heat exchanger tubes (not shown), etc. of the heat exchanger due to long-term use, the dust removal device is activated. That is, the supply device supplies the flammable gas M to the detonator tube 22 to fill it, and ignites the flammable gas M. Then, the combustible gas M burns inside the detonator 22 to generate a flame C and generate a shock wave S due to the detonation. The generated shock wave S is transmitted to the internal space 103 through the detonator 22 and the combustor 23A, acts on the inner wall surface 102a of the furnace wall 102 and the outer surface of the heat exchanger tube, and the attached dust is blown off and removed. At this time, the shock wave S caused by the detonation generated in the detonator 22 is transmitted to the internal space 103 of the furnace 101 through the expanding tube 23Ab, which expands the diameter, so that the supersonic flow ejected with the blast is expanded at an appropriate area ratio. By doing so, the blast wave and jet stream can be efficiently introduced into the internal space 103. When the dust removing device removes the dust attached to the inner wall surface 102a of the furnace wall 102 and the outer surface of the heat transfer tube, the operation of the dust removing device is stopped.

When the dust removal device described above removes dust, there is a possibility that the combustible gas M filled in the detonator 22 and the combustor 23A will self-ignite. Therefore, the ejection part 15 is activated when the dust removal device is activated. That is, the on-off valve 88 is opened and the nonflammable gas N is supplied from the gas supply source 87 to the gas space 84 through the gas supply line 86 . Then, the nonflammable gas N filled in the gas space 84 flows through the gas flow section 82 toward the other end of the combustor 23A, and is ejected from the plurality of jet holes 15a toward the center of the expansion tube 23Ab. Ru.

At this time, the ejection part 15 ejects the nonflammable gas N from the plurality of ejection holes 15a toward the center of the combustor 23A, thereby creating a gap between the inside of the expansion tube 23Ab and the internal space 103 of the furnace 101. Form an air curtain. Since the air curtain of nonflammable gas N partitions the inside of the expansion tube 23Ab and the internal space 103, it is possible to prevent the rising exhaust gas E from infiltrating the interior space 103, for example, into the inside of the combustor 23A through the expansion tube 23Ab. suppressed. Therefore, self-ignition of the combustible gas M filled in the detonator 22 due to contact with the high-temperature exhaust gas E is suppressed.

However, due to the flow rate and uneven flow of the exhaust gas E rising in the internal space 103, there is a possibility that a portion of the exhaust gas E may slip through the air curtain of the nonflammable gas N and enter the expansion tube 23Ab. At this time, since the expansion tube 23Ab has a larger inner diameter (area) on the furnace wall 102 side than on the blast tube 22 side, the exhaust gas E that has entered the expansion tube 23Ab from the internal space 103 is In FIG. 5, the secondary flow N1 turns counterclockwise. Therefore, the exhaust gas E that has entered the expansion tube 23Ab turns into a secondary flow N1, swirls inside the expansion tube 23Ab, and stays there, making it difficult to flow toward the detonator 22. Self-ignition of M is suppressed.

Furthermore, even if part of the exhaust gas E that has entered the expansion tube 23Ab comes into contact with the combustible gas M filled in the detonator tube 22, the temperature of the exhaust gas E decreases while flowing through the expansion tube 23Ab. That is, the flammable gas M in the detonator 22 is diluted by being mixed with the exhaust gas E whose temperature has decreased, and its 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, self-ignition of the combustible gas M is suppressed.

<Control of shock wave generator>
FIG. 7 is a flowchart illustrating a shock wave generation method by the shock wave generation device.

As shown in FIGS. 5 and 6, in step S10, the control device 14 opens the purge gas supply valve 55 and is supplying 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. When generating a shock wave, the control device 14 closes the purge gas supply valve 55 and stops supplying the purge gas P to the combustion device 11 in step S11. In step S12, the control device 14 opens the fuel supply valve 37 and starts supplying the fuel F. In step S13, the control device 14 opens the oxidizing agent supply valve 47 and starts supplying the oxidizing agent A. Then, combustible gas M in which fuel F and oxidizer A are mixed is supplied to the detonator 22 of the combustion device 11 .

In step S14, the control device 14 opens the on-off valve 88 and starts supplying the nonflammable gas N. Then, the nonflammable gas N is ejected from the plurality of ejection holes 15a toward the center of the combustor 23A, forming an air curtain between the inside of the combustor 23A and the internal space 103 of the furnace 101. The air curtain of nonflammable gas N partitions the inside of the combustor 23A and the internal space 103, and suppresses the exhaust gas E from penetrating into the inside of the combustor 23A.

In step S15, the control device 14 determines whether a predetermined filling time Ta has elapsed since the start of the supply of the fuel F and the oxidizer A, that is, the start of the supply of the combustible gas M to the combustion device 11. Determine. The filling time Ta is set according to the amount of combustible gas M filled into the combustion device 11. Here, if the control device 14 determines that the filling time Ta has not elapsed (No), it remains on standby. On the other hand, if the control device 14 determines that the filling time Ta has elapsed (Yes), the control device 14 closes the fuel supply valve 37 and stops supplying the fuel F in step S16. Then, in step S17, the control device 14 closes the oxidizing agent supply valve 47 to stop the supply of the oxidizing agent A.

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

When the shock wave S is generated, the flame C is extinguished, so in step S21, the control device 14 closes the on-off valve 88 to stop the supply of the nonflammable gas N, and releases the air curtain of the nonflammable gas N. do. Then, in step S22, the control device 14 opens the purge gas supply valve 55 and supplies the purge gas P to the combustion device 11.

<Operation of shock wave generator>
FIG. 8 is a time chart showing a shock wave generation method by the shock wave generation device.

At time t11, the supply of purge gas P to the combustion device 11 is stopped, and the supply of fuel F to the combustion device 11 is started, and at the same time, the supply of the oxidizer A to the combustion device 11 is started. Then, combustible gas M in which fuel F and oxidizer A are mixed is supplied to the detonator 22 of the combustion device 11 . Furthermore, the supply of nonflammable gas N is started, and an air curtain is formed between the inside of the combustor 23A and the internal space 103 of the furnace 101. In this state, the inside of the combustion device 11 is filled with a predetermined amount of combustible gas M.

At time t12, when a predetermined filling time Ta has elapsed since the start of supply of combustible gas M, the supply of fuel F to the combustion device 11 is stopped, and the supply of oxidizer A to the combustion device 11 is also 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 detonator 22. Then, the combustible gas M is ignited, the flame C spreads, and a shock wave S is generated due to the detonation. When the shock wave S is generated, at time t14, the air curtain of the nonflammable gas N is released and the purge gas P is supplied to the combustion device 11.

[Actions and effects of this embodiment]
The shock wave generation device according to the first aspect includes a combustion device 11 in which a gas passage 21 through which combustion gas flows from a base end to a distal end and an opening is provided at the distal end, and a fuel supply path 32 for supplying fuel. , the oxidizer supply path 42 that supplies the oxidizer, the combustible gas supply path 52 that supplies the combustible gas M in which fuel and the oxidizer are mixed to the combustion device 11, and the flow rate of fuel flowing through the fuel supply path 32. A fuel flow rate adjustment device to adjust, an oxidizer flow rate adjustment device to adjust the flow rate of the oxidant flowing through the oxidizer supply path 42, an ignition device 13 to ignite the combustible gas M supplied to the combustion device 11, and a combustion device. The control device 14 controls the fuel flow rate adjustment device and the oxidizing agent flow rate adjustment device according to the supply state of the combustible gas M supplied to the oxidizing agent flow rate adjustment device 11 .

According to the shock wave generation device according to the first aspect, the instantaneous flow rate when the combustible gas supply device 12 supplies the combustible gas M to the combustion device 11 is adjusted by the fuel flow rate adjustment device and the oxidizer flow rate adjustment device. When the combustible gas M is supplied to the combustion device 11, the mixture ratio of the fuel F and the oxidizer A can be maintained constant with high precision, and a shock wave due to detonation can be generated with stable intensity. Can be done. In addition, by adjusting the instantaneous flow rate of the combustible gas M using the fuel flow rate adjustment device and the oxidizing agent flow rate adjustment device, it is possible to supply the amount of combustible gas M depending on the application of the shock wave, and the fuel F and oxidizer It is possible to suppress the amount of agent A used and lower running costs. As a result, it is possible to control the amount of combustible gas M supplied to the combustion device 11 with high accuracy.

The shock wave generation device according to the second aspect is the shock wave generation device according to the first aspect, and further, the fuel flow rate adjustment device and the oxidant flow rate adjustment device include mass flow controllers 35 and 45. Thereby, even while the combustible gas M is being supplied to the combustion device 11, the mixture ratio of the fuel F and the oxidizer A can be adjusted, and the The mixing ratio can be adjusted appropriately.

The shock wave generation device according to the third aspect is the shock wave generation device according to the first aspect, and further, the fuel flow rate adjustment device and the oxidant flow rate adjustment device have sonic nozzles 61, 71 or orifices. Thereby, the instantaneous flow rate can be robustly controlled to be constant without relying on electronic control.

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

The shock wave generation device according to the fifth aspect is the shock wave generation device according to any one of the first to fourth aspects, and further, the control device 14 controls at least the combustible gas M for the combustion device 11. The fuel flow rate adjustment device and the oxidizer flow rate adjustment device are controlled so that the mixture ratio of the combustible gas approaches the stoichiometric mixture ratio at the end of the filling time. Thereby, the ignition device 13 can appropriately ignite and burn the combustible gas M filled in the combustion device 11 to generate the flame C.

The shock wave generation device according to the sixth aspect is the shock wave generation device according to the fourth aspect or the fifth aspect, and further, the control device 14 controls the combustion device 11 at the beginning of the filling time of the combustible gas M. The fuel flow rate adjustment device and the oxidizing agent flow rate adjustment device are controlled so that the mixture ratio of the combustible gas M becomes excess fuel. As a result, even if air remains inside the combustion device 11, by setting the mixture ratio of the combustible gas M such that the fuel becomes excessive at the initial stage of supply, the combustible gas inside the combustion device 11 is finally The mixing ratio of M can be adjusted to an appropriate value.

The shock wave generation device according to the seventh aspect is the shock wave generation device according to any one of the first to sixth aspects, and further includes a shock wave generation device that is nonflammable from the outer periphery toward the center of the combustion device 11. It has an ejection part 15 that ejects gas N. As a result, the inside of the combustion device 11 and the internal space 103 are separated by the air curtain of non-flammable gas N, so that the intrusion of the exhaust gas E into the inside of the combustion device 11 is suppressed, and the exhaust gas E is prevented from entering the combustion device 11. Self-ignition of the filled combustible gas M can be suppressed. As a result, large valves and the like are not required, and increases in parts costs and maintenance costs can be suppressed. In addition, the air curtain of nonflammable gas N that partitions the combustion device 11 and the internal space 103 can be provided by simply providing the jetting portion 15 in the combustion device 11, and there is no risk of malfunction even if the combustion device 11 is placed in a high-temperature environment. , self-ignition of the combustible gas M can be appropriately suppressed.

The shock wave generation device according to the eighth aspect is the shock wave generation device according to the seventh aspect, and further, the jetting section 15 jets out the nonflammable gas N at the same time as supplying the combustible gas M to the combustion device 11. After igniting the combustible gas M supplied to the combustion device 11, the ejection of the non-flammable gas N is stopped. Thereby, an air curtain of nonflammable gas N can be formed at appropriate timing.

In the embodiments described above, the shock wave generation device is used as a dust removal device that removes dust adhering to the inner wall surface of a furnace, the outer surface of a heat exchanger tube, etc. of a furnace such as a garbage incinerator, coal gasification combined cycle power generation facility, and power generation boiler. However, the scope of application is not limited to these. Shock wave generators include, for example, propulsion engines that emit shock waves from the opening of a combustor and generate thrust by receiving the reaction force, power engines that turn turbines, emit shock waves from the opening of a combustor, and generate thrust near the opening. A device that uses the high pressure of shock waves to exert physical action on objects placed inside a combustion device (destruction of structures, separation of materials, etc.), and a device that uses high pressure of shock waves to act on objects placed inside a combustion device. It can be applied to devices that exert physical action (destruction of structures, separation of materials, etc.).

10, 10A, 10B, 10C Shock wave generation device 11 Combustion device 12, 12A, 12B Combustible gas supply device 13 Ignition device 14 Control device 15 Ejection part 15a Ejection hole 21 Gas passage 22 Explosive pipe 23, 23A Combustor 24 First passage 25 Second passage 26 Mixing accelerator 31, 31A, 31B Fuel supply section 32 Fuel supply path 33 Fuel cylinder 34 Pressure reducing valve 35 Mass flow controller (fuel flow rate adjustment device)
36 Safety device 37 Fuel supply valve 38 Check valve 41, 41A, 41B Oxidizing agent supply section 42 Oxidizing agent supply path 43 Oxidizing agent cylinder 44 Pressure reducing valve 45 Mass flow controller (oxidizing agent flow rate adjustment device)
46 Safety device 47 Oxidizer supply valve 48 Check valve 51 Cross joint 52 Flammable gas supply path 53 Purge gas path 54 Air blower 55 Purge gas supply valve 61 Sonic nozzle (fuel flow rate adjustment device)
61B Sonic nozzle device (fuel flow rate adjustment device)
62 First fuel branch path 63 Second fuel branch path 64 First sonic nozzle 65 Second sonic nozzle 66 First on-off valve 67 Second on-off valve 71 Sonic nozzle (oxidizer flow rate adjustment device)
71B Sonic nozzle device (oxidizer flow rate adjustment 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 pipe 82 Gas flow section 83 Header 84 Gas space section 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 Oxidizer M Flammable gas P Purge gas C Flame S Shock wave N Non-flammable gas E Exhaust gas N1 Secondary flow

Claims (8)

A combustion device in which a gas passage through which combustion gas flows from a base end to a distal end is provided, and an opening is provided at the distal end;
a fuel supply route for supplying fuel;
an oxidizing agent supply route that supplies the oxidizing agent;
a combustible gas supply path that supplies a combustible gas in which the fuel and the oxidizer are mixed 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 oxidizing agent flow rate adjustment device that adjusts the flow rate of the oxidizing agent flowing through the oxidizing agent supply path;
an ignition device that ignites the combustible gas supplied to the combustion device;
a control device that controls the fuel flow rate adjustment device and the oxidizer flow rate adjustment device according to the supply state of the combustible gas supplied to the combustion device;
A shock wave generation device comprising: The fuel flow rate adjustment device and the oxidant flow rate adjustment device include a mass flow controller,
The shock wave generating device according to claim 1. The fuel flow rate adjustment device and the oxidant flow rate adjustment device have an orifice or a sonic nozzle,
The shock wave generating device according to claim 1. The fuel flow rate adjustment device and the oxidizer flow rate adjustment device include 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, and a plurality of fuel branch paths. The orifice or the sonic nozzle is provided in each of the fuel branch paths and the plurality of oxidant branch paths, and the on-off valve is provided in each of the plurality of fuel branch paths and the plurality of oxidant branch paths.
The shock wave generating device according to claim 3. The control device controls the fuel flow rate adjustment device and the oxidizer flow rate adjustment device so that the mixture ratio of the combustible gas approaches the stoichiometric mixture ratio at least at the end of the filling time of the combustible gas into the combustion device. Control,
The shock wave generation device according to any one of claims 1 to 4. The control device controls the fuel flow rate adjustment device and the oxidizer flow rate adjustment device so that the mixture ratio of the combustible gas becomes excess fuel at the beginning of the time when the combustion device is filled with the combustible gas.
The shock wave generating device according to claim 5. having an ejection part that ejects nonflammable gas from the outer periphery of the combustion device toward the center;
The shock wave generating device according to claim 1. The ejection part ejects the non-flammable gas at the same time as supplying the flammable gas to the combustion device, and stops ejecting the non-flammable gas after igniting the combustible gas supplied to the combustion device.
The shock wave generating device according to claim 7.

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