Pressure wave generator, and method for operating a pressure wave generator

Abstract

To provide a pressure wave generator that can reduce running costs and suppress the occurrence of unintended malfunctions. [Solution] The pressure wave generator 1 generates a pressure wave by releasing high-pressure gas generated in a high-pressure chamber 3 to the outside from an outlet 7. The pressure wave generator 1 comprises a high-pressure gas container 2 that defines a high-pressure chamber and has an outlet 5 for ejecting high-pressure gas along a first direction, a gas fuel supply device 8 that supplies gas fuel to the high-pressure chamber, an ignition device 10 that ignites the gas fuel supplied to the high-pressure chamber, an opening timing acquisition device 12 that can acquire the opening timing when the opening of the connecting passage 9 connecting the outlet and the discharge port becomes 100%, defined as the state in which the area open to the connecting passage is maximized by the movement of the barrier 4, and an ignition execution device 100 that includes a delay time setting unit for setting a delay time and an ignition unit that causes the ignition device to perform an ignition operation when the delay time has elapsed after the opening timing.

Description

Technical Field

[0005]

[0001] The present disclosure relates to a pressure wave generator configured to generate a pressure wave by discharging high-pressure gas generated in a high-pressure chamber to the outside through a discharge port, and an operation method of the pressure wave generator.

Background Art

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the mixing ratio, which is the ratio of the amount of oxygen gas to the amount of gas fuel in the high-pressure chamber, is smaller than the theoretical mixing ratio (the ratio of the amount of gas fuel to the minimum amount of oxygen gas theoretically required to completely burn this amount of gas fuel), that is, when the amount of oxygen gas is small, there is a risk that unburned gas fuel remains in the high-pressure chamber or flows out to the outside (for example, into a furnace). In either case, the unburned gas fuel is wasted, increasing the running cost unnecessarily. The unburned gas fuel that has flowed out to the outside may cause unintended problems such as an explosion. However, the pressure wave generators described in Patent Documents 1 to 3 do not particularly mention the remaining or outflow of unburned gas fuel in the high-pressure chamber when the amount of oxygen gas in the high-pressure chamber is small.

[0005] This disclosure has been made in view of the above-mentioned problems and aims to provide a pressure wave generator and a method for operating a pressure wave generator that can reduce running costs and suppress the occurrence of unintended malfunctions. Furthermore, the aim is to achieve efficient operation by optimizing the operating conditions in accordance with the operating status of the boiler and other equipment on which the pressure wave generator (soot blower) is installed. [Means for solving the problem]

[0006] To achieve the above objective, the pressure wave generating device according to the present disclosure is configured to generate a pressure wave by releasing high-pressure gas generated in a high-pressure chamber to the outside from an outlet, and comprises: a high-pressure gas container that defines the high-pressure chamber and has an outlet for ejecting the high-pressure gas along a first direction; a gas fuel supply device that supplies gas fuel to the high-pressure chamber; an ignition device that ignites the gas fuel supplied to the high-pressure chamber; an opening timing acquisition device configured to acquire an opening timing when the opening of a connecting passage connecting the outlet and the discharge port becomes 100%, where the opening of the connecting passage is defined as 0% when the connecting passage is blocked by an obstruction and 100% when the area open to the connecting passage becomes maximum due to the movement of the obstruction; and an ignition execution device including a delay time setting unit for setting a delay time and an ignition unit that causes the ignition device to perform an ignition operation when the delay time has elapsed after the opening timing.

[0007] To achieve the above objective, the method for operating a pressure wave generator according to the present disclosure is a method for operating a pressure wave generator configured to generate a pressure wave by releasing high-pressure gas generated in a high-pressure chamber to the outside from an outlet, the method comprising: a high-pressure gas container defining the high-pressure chamber and having an outlet for ejecting the high-pressure gas along a first direction; a gas fuel supply device for supplying gas fuel to the high-pressure chamber; an ignition device for igniting the gas fuel supplied to the high-pressure chamber; and an opening timing acquisition device configured to acquire an opening timing when the opening of a connecting passage connecting the outlet and the discharge port becomes 100%, where the opening of the connecting passage is defined as 0% when the connecting passage is blocked by an obstruction and 100% when the area open to the connecting passage becomes maximum due to the movement of the obstruction, the method comprising: a delay time setting step for setting a delay time; and an ignition step for causing the ignition device to perform an ignition operation when the delay time has elapsed after the opening timing. [Effects of the Invention]

[0008] According to the pressure wave generator and operating method of the pressure wave generator described herein, running costs can be reduced and unintended malfunctions can be suppressed. [Brief explanation of the drawing]

[0009] [Figure 1] This figure schematically shows the configuration of a pressure wave generator according to one embodiment. [Figure 2] This is a schematic functional block diagram of a control device according to one embodiment. [Figure 3] This figure shows an example of a map according to one embodiment. [Figure 4] This is a flowchart illustrating the operation method of a pressure wave generator according to one embodiment. [Modes for carrying out the invention]

[0010] The following description, based on the drawings, will explain a pressure wave generator and an operating method for the pressure wave generator according to embodiments of this disclosure. Such embodiments represent one aspect of this disclosure and are not limiting, and can be modified at will within the scope of the technical idea of ​​this disclosure.

[0011] The pressure wave generating device according to this disclosure is installed, for example, in a boiler attached to an incinerator, and is configured to generate pressure waves by releasing high-pressure gas generated in a high-pressure chamber to the outside through an outlet.

[0012] <Pressure wave generator> (composition) Figure 1 is a schematic diagram showing the configuration of a pressure wave generator 1 according to one embodiment. As shown in Figure 1, the pressure wave generator 1 includes a high-pressure gas container 2, a gas fuel supply device 8, an ignition device 10, an opening timing acquisition device 12, and a control device 100. In the embodiment illustrated in Figure 1, the pressure wave generator 1 further includes a piston 4, a piston housing container 6, a discharge nozzle 14, an oxygen supply device 16, a first gas supply device 18, a second gas supply device 20, and a pressure acquisition device 22.

[0013] The high-pressure gas container 2 defines a high-pressure chamber 3 inside. This high-pressure gas container 2 has a nozzle 5 for ejecting the high-pressure gas HG generated in the high-pressure chamber 3 along a first direction D1. In the embodiment illustrated in Figure 1, the high-pressure gas container 2 has a cylindrical shape and extends along the first direction D1. The nozzle 5 is formed at one end of the high-pressure gas container 2 on one side in the first direction D1. The high-pressure chamber 3 has a circular shape when viewed in cross-section in a direction perpendicular to the first direction D1.

[0014] In one embodiment, as illustrated in Figure 1, the high-pressure gas container 2 includes a diameter-reducing section 23 that reduces the inner diameter of the high-pressure chamber 3 to d1 as it approaches the nozzle 5 (one side in the first direction D1). The diameter of the nozzle 5 is d1, and the inner diameter of the high-pressure chamber 3 is maintained at d1 from one end of the diameter-reducing section 23 on the nozzle 5 side to the nozzle 5. The high-pressure gas container 2 has a gas fuel supply hole 24 and an oxygen supply hole 26 that penetrate from the outer wall surface to the high-pressure chamber 3. One end of the high-pressure gas container 2 on one side in the first direction D1 is connected to a piston housing container 6. The high-pressure gas container 2, the piston housing container 6, and the discharge nozzle 14 are integrally constructed as a single component. In some embodiments, the high-pressure gas container 2, the piston housing container 6, and the discharge nozzle 14 are each separate from one another.

[0015] The piston 4 opens or closes a connecting passage 9 that connects the nozzle 5 and the outlet 7 for releasing high-pressure gas HG to the outside. The piston 4 extends along a second direction D2 that intersects a first direction D1. The piston 4 has a through hole 21 that penetrates the piston 4 along the first direction D1. In this disclosure, the second direction D2 is perpendicular to the first direction D1. In one embodiment, as illustrated in Figure 1, the connecting passage 9 includes a discharge space 11 (described later) of the discharge nozzle 14 and a flow space 15 (described later) located between one storage section 30 and the other storage section 32 of the storage space 13 formed inside the piston storage container 6.

[0016] In one embodiment, the piston 4 has a cylindrical shape. The through-hole 21 of the piston 4 has a circular shape when viewed in a cross-sectional view taken in a direction perpendicular to the first direction D1 (second direction D2). The diameter of the through-hole 21 is the same as the diameter of the nozzle 5. In the first embodiment, the diameter of the through-hole 21 is configured to be the same throughout the entire first direction D1, but the disclosure is not limited to this embodiment.

[0017] The piston storage container 6 houses the piston 4 so as to be reciprocable along the second direction D2. In one embodiment, the piston storage container 6 has a cylindrical shape and extends along the second direction D2. An accommodation space 13 is formed inside the piston storage container 6. The accommodation space 13 has a circular shape in a cross-sectional view taken along the first direction D1. The piston storage container 6 includes a one-side storage portion 30 located on one side of the second direction D2 with respect to the connection flow path 9 and an other-side storage portion 32 located on the other side of the second direction D2 with respect to the connection flow path 9.

[0018] The one-side storage portion 30 and the other-side storage portion 32 are spaced apart from each other in the second direction D2, and a flow-through space 15 is formed between the one-side storage portion 30 and the other-side storage portion 32. The internal space 31 of the one-side storage portion 30 opens toward the other side of the second direction D2 and communicates with the flow-through space 15. The internal space 33 of the other-side storage portion 32 opens toward the one side of the second direction D2 and communicates with the flow-through space 15. That is, the accommodation space 13 includes, in order from one side of the second direction D2, the internal space 31 of the one-side storage portion 30, the flow-through space 15, and the internal space 33 of the other-side storage portion 32.

[0019] The one-side storage portion 30 includes an end wall 38 having a facing surface 36 facing one end surface 34 on one side of the piston 4 in the second direction D2. A first gas flow-through hole 35 penetrating the end wall 38 along the second direction D2 is formed in the end wall 38. The other-side storage portion 32 includes an end wall 46 having a facing surface 44 facing the other end surface 42 on the other side of the piston 4 in the second direction D2. A second gas flow-through hole 37 penetrating the end wall 46 along the second direction D2 is formed in the end wall 46.

[0020] The first gas supply device 18 supplies the first gas G1 to the internal space 31 of the one-side storage portion 30 through the first gas flow hole 35. In one embodiment, as illustrated in FIG. 1, the first gas supply device 18 includes a first gas tank 50 in which the first gas G1 is stored, a first gas line 52 that communicates the first gas tank 50 with the one-side storage portion 30 of the piston storage container 6, and a first gas valve 54 provided in the first gas line 52. The first gas valve 54 is, for example, a solenoid valve electrically connected to the control device 100, and is closed or opened according to an instruction transmitted from the control device 100. When the first gas valve 54 is opened, the first gas G1 is supplied to the internal space 31 of the one-side storage portion 30.

[0021] In one embodiment, as illustrated in FIG. 1, the pressure wave generator 1 further includes a first pressure release line 72 connected to a portion of the first gas line 52 on the side of the piston storage container 6 with respect to the first gas valve 54, and a first pressure release valve 74 provided in the first pressure release line 72. The outlet of the first pressure release line 72 (formed on the side opposite to the first gas line 52 side) opens, for example, into the discharge space 11. The first pressure release valve 74 is, for example, a solenoid valve, and is opened or closed according to an instruction transmitted from the control device 100. When the first pressure release valve 74 is opened, the first gas G1 can be discharged from the internal space 31 of the one-side storage portion 30 into the discharge space 11.

[0022] The second gas supply device 20 supplies the second gas G2 to the internal space 33 of the other-side storage portion 32 through the second gas flow hole 37. In one embodiment, as illustrated in FIG. 1, the second gas supply device 20 includes a second gas tank 56 in which the second gas G2 is stored, a second gas line 58 that communicates the second gas tank 56 with the other-side storage portion 32 of the piston storage container 6, and a second gas valve 60 provided in the second gas line 58. The second gas valve 60 is, for example, a solenoid valve electrically connected to the control device 100, and is closed or opened according to an instruction transmitted from the control device 100. When the second gas valve 60 is opened, the second gas G2 is supplied to the internal space 33 of the other-side storage portion 32.

[0023] In one embodiment, as illustrated in Figure 1, the pressure wave generator 1 further includes a second pressure relief line 76 connected to the portion of the second gas line 58 closer to the piston housing container 6 than the second gas valve 60, and a second pressure relief valve 78 provided on the second pressure relief line 76. The outlet of the second pressure relief line 76 (formed on the opposite side from the second gas line 58) opens, for example, to a discharge space 11. The second pressure relief valve 78 is, for example, a solenoid valve and is opened or closed according to instructions transmitted from the control device 100. When the second pressure relief valve 78 is opened, the second gas G2 can be discharged from the internal space 33 of the other side housing 32 to the discharge space 11.

[0024] The first gas G1 and the second gas G2 may have the same components or different components. In one embodiment, each of the first gas G1 and the second gas G2 is a non-flammable gas, such as nitrogen gas.

[0025] The discharge nozzle 14 has a cylindrical shape with open ends and extends along a first direction D1. The discharge nozzle 14 has a discharge port 7 at one end on one side of the first direction D1 and an inlet 19 at the other end on the other side of the first direction D1. The other end of the discharge nozzle 14 on the other side of the first direction D1 is connected to the piston housing container 6. The discharge space 11 formed inside the discharge nozzle 14 has a circular shape when viewed in cross-section in a direction perpendicular to the first direction D1 (second direction D2). The discharge nozzle 14 includes an expanding section 25 that widens the inner diameter of the discharge space 11 as it approaches the discharge port 7 (one side of the first direction D1). The inner diameter of the discharge space 11 of the discharge nozzle 14 is maintained from the end of the expanding section 25 on the discharge port 7 side to the discharge port 7, and the discharge port 7 has a larger diameter than the nozzle 5. The discharge nozzle 14 is located on the opposite side of the piston housing 6 from the high-pressure gas container 2 in the first direction D1. The centerline O2 of the discharge nozzle 14 is located on the centerline O1 of the high-pressure gas container 2.

[0026] In one embodiment, the piston 4 described above is configured to be housed in both the internal space 31 of the one-side housing 30 and the internal space 33 of the other-side housing 32. Therefore, the piston 4 moves along the second direction D2 in accordance with the pressure difference ΔP between the air pressure in the internal space 31 of the one-side housing 30 and the air pressure in the internal space 33 of the other-side housing 32.

[0027] The piston 4 is pressed by the differential pressure ΔP generated by the supply of the first gas G1 and the second gas G2, and moves along the second direction D2. When the through hole 21 aligns with the connecting passage 9 due to the movement of the piston 4, the connecting passage 9 is opened. On the other hand, if the through hole 21 does not align with the connecting passage 9, the connecting passage 9 is blocked. In this disclosure, the opening degree of the connecting passage 9 is defined as 0% when the connecting passage 9 is blocked by the piston 4 (blocker), and 100% when the area of ​​the through hole 21 opening to the connecting passage 9 is maximized due to the movement of the piston 4 (blocker). The 100% opening state refers to, for example, the state in which the center line of the connecting passage 9 and the center line of the through hole 21 overlap each other. However, this disclosure is not limited to the state in which the 100% opening state refers to the state in which the center line of the connecting passage 9 and the center line of the through hole 21 overlap each other. The 100% opening state refers to a state in which the portion of the flow space 15 that opens to the nozzle 5 is not blocked at all by the piston 4 and is completely open.

[0028] In one embodiment, the piston housing 6 is configured to restrict the movement of the piston 4 in the second direction when the opening of the connecting passage 9 reaches 100%. Specifically, as illustrated in Figure 1, the length L1 of the second direction D2 from the other end face 42 of the piston 4 to the through hole 21 is equal to, or nearly equal to, the length L2 of the internal space 33 of the other housing portion 32 in the second direction D2.

[0029] The gas fuel supply device 8 supplies gas fuel F to the high-pressure chamber 3. As shown in Figure 1, the gas fuel supply device 8 includes a gas fuel tank 80 in which the gas fuel F is stored, a gas fuel line 82 connecting the gas fuel tank 80 and the high-pressure gas container 2, and a gas fuel valve 84 provided in the gas fuel line 82. The gas fuel valve 84 is configured to switch whether or not to allow the gas fuel F to flow toward the high-pressure chamber 3. Specifically, the gas fuel valve 84 is a solenoid valve and is opened or closed according to instructions transmitted from the control device 100. Although not shown, the gas fuel supply device 8 further includes a gas fuel check valve provided on the high-pressure gas container 2 side of the gas fuel valve 84 and configured to allow flow only from the gas fuel tank 80 toward the high-pressure chamber 3.

[0030] The ignition device 10 ignites the gaseous fuel F supplied to the high-pressure chamber 3. The ignition device 10 includes, for example, a spark plug 62 located in the high-pressure chamber 3, which ignites the gaseous fuel F in the high-pressure chamber 3 by discharging a spark from the spark plug 62, thereby generating high-pressure gas HG. In one embodiment, the ignition device 10 is electrically connected to a control device 100, which will be described later, and performs the ignition operation according to instructions transmitted from the control device 100.

[0031] The opening timing acquisition device 12 is configured to acquire the opening timing TX at which the opening degree of the connecting channel 9 becomes 100%. The opening timing acquisition device 12 is, for example, a position sensor supported on one end face 34 of the piston 4 and detecting the position of the piston 4. The position sensor acquires the opening timing TX (the timing at which the opening degree of the connecting channel 9 becomes 100%) from the position of the piston 4. One example of a position sensor is a magnetic sensor, a pressure sensor, or an optical sensor. The position sensor is electrically connected to the control device 100 and transmits the opening timing TX to the control device 100. However, this disclosure does not limit the opening timing acquisition device 12 to a position sensor. The opening timing acquisition device 12 may also include a barometric pressure sensor or a pressure sensor, and is configured to calculate or acquire the opening degree of the connecting channel 9 from the barometric pressure or pressure value. Furthermore, by providing multiple detection points for the opening timing acquisition device 12, the position of the piston 4 can be determined more accurately, and even more accurate acquisition of the opening timing TX becomes possible. In some embodiments, the release timing acquisition device 12 further includes a second position sensor supported on the other end face 42 of the piston 4 for detecting the position of the piston 4.

[0032] The oxygen supply device 16 supplies oxygen gas O to the high-pressure chamber 3. As shown in Figure 1, the oxygen supply device 16 includes an oxygen gas tank 90 in which oxygen gas O is stored, an oxygen line 92 connecting the oxygen gas tank 90 and the high-pressure gas container 2, and an oxygen valve 94 provided on the oxygen line 92. The oxygen valve 94 is configured to switch whether or not to allow oxygen gas O to flow toward the high-pressure chamber 3. Specifically, the oxygen valve 94 is a solenoid valve and is opened or closed according to instructions transmitted from the control device 100. When the oxygen valve 94 is opened, oxygen gas O is supplied to the high-pressure chamber 3. In one embodiment, the strength of the pressure wave can be arbitrarily controlled by adjusting the ratio and amount of gas fuel F and oxygen gas O using the gas fuel supply device 8 and oxygen supply device 16 described above. Although not shown, the oxygen supply device 16 further includes an oxygen gas check valve provided on the high-pressure gas container 2 side of the oxygen valve 94 and configured to allow flow only from the oxygen gas tank 90 toward the high-pressure chamber 3.

[0033] The pressure acquisition device 22 acquires the atmospheric pressure inside the high-pressure chamber 3. The pressure acquisition device 22 transmits the acquired atmospheric pressure value inside the high-pressure chamber 3 (hereinafter referred to as high-pressure chamber pressure PX) to the control device 100.

[0034] The control device 100 is a computer with programming functions, such as an electronic control device, and includes a processor such as a CPU or GPU (not shown), memory such as ROM or RAM, and an I / O interface. The control device 100 realizes each of its functional units by having the processor operate (calculate, etc.) according to the instructions of a program loaded into memory. In some embodiments, the control device 100 is connected to a cloud located in a remote cloud environment and includes communication equipment for exchanging operation data and control data. The connection to the cloud system may be directly from the control device 100, or it may be via the control device of the main equipment such as a boiler in which the pressure wave generator 1 is installed.

[0035] As illustrated in Figure 1, the control device 100 is electrically connected to the opening timing acquisition device 12 (p1), enabling it to acquire the opening timing TX. The control device 100 is electrically connected to the ignition device 10 (p2), instructing the timing for executing the ignition operation. The control device 100 is electrically connected to the pressure acquisition device 22 (p3), acquiring the high-pressure room pressure PX. Although not shown, the control device 100 is also electrically connected to the gas fuel valve 84, oxygen valve 94, first gas valve 54, second gas valve 60, first pressure relief valve 74, and second pressure relief valve 78, instructing their opening and closing timings.

[0036] Figure 2 is a schematic functional block diagram of a control device 100 according to one embodiment. As shown in Figure 2, the control device 100 includes a delay time setting unit 102 and an ignition unit 104. In one embodiment, the control device 100 also functions as an ignition execution device including the delay time setting unit 102 and the ignition unit 104. The control device 100 may also be configured to control the execution timing of the ignition operation of each ignition device 10 of two or more pressure wave generators 1.

[0037] The delay time setting unit 102 sets the delay time TD. The delay time TD is set based on the mixing ratio MR, which is the ratio of the amount of oxygen gas O to the amount of gas fuel F in the high-pressure chamber 3, and the ignition pressure PI in the high-pressure chamber 3 when the supply of gas fuel F and oxygen gas O to the high-pressure chamber 3 is completed. In one embodiment, the delay time TD is 0 ms or more and 20 ms or less. In the following, methane gas is used as the gas fuel F, and the theoretical mixing ratio (the ratio of the amount of gas fuel F to the minimum amount of oxygen gas O theoretically required to completely combust this amount of gas fuel F) is 1:2.

[0038] The method for setting the delay time TD will be explained in detail. In one embodiment, as illustrated in Figure 2, the control device 100 further includes a storage unit 106. The storage unit 106 stores a map M that shows the relationship between the vibration height of the surface of an object to which a pressure wave collides and the acceleration of the surface vibration. Based on the map M, it is possible to adjust the output of the pressure wave. This map M includes the mixing ratio MR and the ignition pressure PI. The object is, for example, a heat transfer tube, and the map M shows the relationship between the vibration height of the heat transfer surface of the heat transfer tube and the acceleration of the vibration of the heat transfer surface when a pressure wave collides with it.

[0039] Figure 3 is a diagram showing an example of map M according to one embodiment, where the horizontal axis represents the height (amplitude) of the vibration of the heat transfer surface, and the vertical axis represents the acceleration of the vibration of the heat transfer surface. The larger the amplitude of the heat transfer surface, the more effectively the removal of deposits such as dust attached to the heat transfer surface is promoted. Similarly, the larger the acceleration of the vibration of the heat transfer surface, the more effectively the removal of deposits attached to the heat transfer surface is promoted.

[0040] Map M shows the relationship between the amplitude of the heat transfer surface and the acceleration of the vibration of the heat transfer surface when the mixing ratio MR is 1:2 (theoretical mixing ratio). The limit curve C indicates the limit within which removal of deposits by the pressure wave is possible. The limit curve C may be stored in the storage unit 106 in advance or may be varied according to the deposits. In FIG. 3, by setting the ignition gas pressure PI and the delay time TD such that they are located above the limit curve C (the removable region R colored in FIG. 3), removal of the deposits is possible. Note that in the form illustrated in FIG. 3, the limit curve C has a curved shape, but the present disclosure is not limited to this form.

[0041] Note that the present disclosure does not limit the map M stored in the storage unit 106 to the map M when the mixing ratio MR is the theoretical mixing ratio. The storage unit 106 may store the map M when the mixing ratio MR is other than the theoretical mixing ratio. Further, the storage unit 106 may store a plurality of maps M with different mixing ratios MR.

[0042] Each of the first inclined line PI1, the second inclined line PI2, and the third inclined line PI3 indicates the ignition gas pressure PI. The magnitude of the ignition gas pressure PI is such that PI1 < PI² < PI3. For example, PI1 is 0.5 Mpa, PI2 is 0.75 Mpa, and PI3 is 1.0 Mpa. Each of the first dotted line TD1, the second dotted line TD2, and the third dotted line TD3 indicates the delay time TD. The length of the delay time TD is such that TD1 < TD2 < TD3. For example, TD1 is 0 ms, TD2 is 5 ms, and TD3 is 10 ms.

[0043] The delay time setting unit 102 sets the delay time TD based on the map M stored in the storage unit 106. The delay time setting unit 102 sets the delay time TD by referring to the map M. For example, if the ignition pressure PI transmitted from the pressure acquisition device 22 is PI2 (0.75 MPa), it selects one of TD1 to TD3 for the delay time TD. If TD2 is selected, the heat transfer surface will have the amplitude and acceleration of point P1, as shown in Figure 1. If TD3 is selected, the heat transfer surface will have the amplitude and acceleration of point P2, as shown in Figure 1. Point P2 allows for the removal of deposits, but it is closer to the limit curve C compared to point P1, and has less margin. In some embodiments, the delay time setting unit 102 sets the delay time TD taking into account the size of the margin.

[0044] The above describes a method for setting the delay time TD using map M, but this disclosure does not limit the method for setting the delay time TD. In one embodiment, as illustrated in Figure 2, the control device 100 further includes an optimal condition setting unit 108 and an input form display unit 110.

[0045] The optimal condition setting unit 108 acquires boiler operating data such as exhaust gas temperature in various parts of the boiler and sets the optimal delay time among TD1 to TD3. By using this in conjunction with the ignition pressure PI for control, even more optimal operation can be achieved.

[0046] The input form display unit 110 sends an input form that allows input values ​​to be entered to a terminal such as a PC or tablet. When a worker enters an input value into the input form via the terminal, the delay time setting unit 102 sets this input value as the delay time TD. Note that the input value may be something other than the delay time TD.

[0047] The ignition unit 104 causes the ignition device 10 to perform an ignition operation after a delay time TD has elapsed since the opening timing TX was reached. Specifically, the ignition unit 104 instructs the ignition device 10 to perform an ignition operation after a delay time TD has elapsed since the opening timing TX was obtained from the opening timing acquisition device 12.

[0048] In some embodiments, the mixture ratio MR, ignition pressure PI, and delay time TD are each preset. The gas fuel supply device 8 and the oxygen supply device 16 supply gas fuel F and oxygen gas O to the high-pressure chamber 3 so that the mixture ratio MR and ignition pressure PI are set, and the ignition device 10 ignites when the set delay time TD has elapsed from the opening timing TX.

[0049] In some embodiments, the control device 100 obtains the amounts of gas fuel F and oxygen gas O supplied to the high-pressure chamber 3 from the gas fuel supply device 8 and the oxygen supply device 16, respectively, and calculates (sets) the mixing ratio MR. In some embodiments, the control device 100 obtains the ignition pressure PI from the pressure acquisition device 22.

[0050] (Effects / Actions) The operation and effects of a pressure wave generator 1 according to one embodiment will be described. When the mixing ratio MR is smaller than the theoretical mixing ratio, that is, when the amount of oxygen gas O is small, there is a risk that unburned gas fuel F will remain in the high-pressure chamber 3 after the pressure wave is generated, or that it may leak out to the outside (for example, into the furnace). Unburned gas fuel F remaining in the high-pressure chamber 3 is wasted and unnecessarily increases running costs. Unburned gas fuel F leaking out to the outside may cause unintended malfunctions such as explosions.

[0051] According to one embodiment, since the ignition operation is performed after the delay time TD has elapsed since the opening timing TX, a portion of the gas fuel F in the high-pressure chamber 3 is released to the outside during the period from the opening timing TX to the elapsed delay time TD, increasing the amount of oxygen available for combustion of the gas fuel F. Therefore, even if the mixture ratio MR in the high-pressure chamber 3 is less than the stoichiometric mixture ratio, the amount of oxygen available for combustion of the gas fuel F can be increased. Thus, the amount of unburned gas fuel F remaining in the high-pressure chamber 3 and the amount of unburned gas fuel F flowing out to the outside can be reduced, thereby reducing running costs and suppressing the occurrence of unintended malfunctions. Furthermore, since it becomes possible to burn the gas fuel F at or near the stoichiometric mixture ratio, the effect of the pressure wave can be adjusted by increasing or decreasing the volume expansion of the pressure wave.

[0052] The pressure wave generator 1 generates pressure waves that change depending on the delay time TD, the mixing ratio MR, and the ignition pressure PI. According to one embodiment, since the delay time TD is set based on the mixing ratio MR and the ignition pressure PI, any desired pressure wave can be generated.

[0053] According to one embodiment, a map M is created for setting the delay time TD from the mixture ratio MR and ignition pressure PI, based on past performance and experimental values, and the delay time TD is set based on this map M. This further reduces running costs and further suppresses the occurrence of unintended malfunctions.

[0054] According to one embodiment, the delay time setting unit 102 sets the delay time TD according to the input value entered by the worker, so the worker can arbitrarily adjust the delay time TD according to the state of the pressure wave supply destination (for example, the operating state of the boiler or the fuel supplied to the furnace).

[0055] According to one embodiment, when the opening of the connecting channel 9 reaches 100%, even if the air pressure in the internal space 31 of one side storage section 30 is greater than the air pressure in the internal space 33 of the other side storage section 32, the other end surface 42 of the piston 4 will still contact the opposing surface 44 of the other end wall 46. As a result, the movement of the piston 4 in the second direction D2 toward the other side is restricted, and the opening of the connecting channel 9 can be maintained at 100%. This makes it easier to acquire data on the effect of the delay time TD on the pressure wave (amplitude of the heat transfer surface and acceleration of vibration of the heat transfer surface). Therefore, compared to the case where the opening of the connecting channel 9 changes immediately after the opening of the connecting channel 9 reaches 100%, it is possible to generate the desired pressure wave with high accuracy.

[0056] If the ignition operation is performed before the opening of the connecting channel 9 reaches 100%, the force of the pressure wave will be large, which may cause malfunctions such as damage to the pressure wave generator 1. According to one embodiment, by setting the delay time TD to 0ms or more and 20ms or less, it is possible to suppress the force of the pressure wave from becoming too large.

[0057] Furthermore, this disclosure is not limited to a pressure wave generator 1 that includes a piston 4 having a through hole 21, a piston housing container 6, a discharge nozzle 14, an oxygen supply device 16, a first gas supply device 18, a second gas supply device 20, and a pressure acquisition device 22.

[0058] In some embodiments, the pressure wave generator 1 includes a high-pressure gas container 2, a gas fuel supply device 8, an ignition device 10, an opening timing acquisition device 12 configured to acquire the opening timing TX at which the opening of the connecting passage 9 becomes 100%, where the opening of the connecting passage 9 is defined as 0% when the connecting passage 9 is blocked by an obstruction and 100% when the area open to the connecting passage 9 is maximized due to the movement of the obstruction, and an ignition execution device 100. In other words, the pressure wave generator 1 may open or block the connecting passage 9 with an obstruction other than the piston 4.

[0059] In some embodiments, the pressure wave generator 1 includes a high-pressure gas container 2, a piston 4 without a through hole 21, a piston housing container 6, a gas fuel supply device 8, an ignition device 10, an opening timing acquisition device 12 configured to acquire an opening timing TX at which the opening of the connecting passage 9 becomes 100%, where 0% is defined as the state in which the connecting passage 9 is blocked by the piston 4, and 100% is defined as the state in which the area open to the connecting passage 9 is maximized by the movement of the piston 4, and an ignition execution device 100. In other words, the pressure wave generator 1 is configured so that the opening of the connecting passage 9 is adjusted by the position of one end face 34 of the piston 4.

[0060] <Operating method for pressure wave generator> Figure 4 is a flowchart of the operation method of a pressure wave generator 1 according to one embodiment. As shown in Figure 4, the operation method of the pressure wave generator 1 includes a delay time setting step S1 and an ignition step S2. In the embodiment illustrated in Figure 4, the operation method of the pressure wave generator 1 further includes an injection pressure setting step S11 and a mixing ratio setting step S12. In the injection pressure setting step S11, the injection pressure is set to supply gas fuel F to the high-pressure chamber 3 before the delay time setting step S1. In the mixing ratio setting step S12, the mixing ratio MR is set before the delay time setting step S1.

[0061] In the delay time setting step S1, the delay time TD is set. The delay time TD may be set automatically using the map M as described above, or by a worker, or it may be set using an input value entered by a worker. In the ignition step S2, the ignition device 10 is made to perform the ignition operation after the delay time TD has elapsed since the opening timing TX.

[0062] According to the method illustrated in Figure 4, the ignition operation is performed after the delay time TD has elapsed since the opening timing TX. Therefore, during the period from the opening timing TX to the elapsed delay time TD, a portion of the gas fuel F in the high-pressure chamber 3 is released to the outside, increasing the amount of oxygen available for combustion of the gas fuel F and simultaneously causing diffusion dilution. As a result, the pressure wave weakens but its propagation range is expanded. Therefore, even if the mixing ratio MR in the high-pressure chamber 3 is less than the stoichiometric mixing ratio, the amount of oxygen available for combustion of the gas fuel F can be increased. Thus, the amount of unburned gas fuel F remaining in the high-pressure chamber 3 and the amount of unburned gas fuel F flowing out to the outside can be reduced, thereby lowering running costs and suppressing the occurrence of unintended malfunctions. Furthermore, since it becomes possible to burn the gas fuel F at or near the stoichiometric mixing ratio, the volume expansion of the pressure wave can be increased, and the effect of the pressure wave can be enhanced.

[0063] The contents described in each of the above embodiments can be understood, for example, as follows:

[0064] [1] The pressure wave generator (1) relating to this disclosure is A pressure wave generator configured to generate a pressure wave by releasing a high-pressure gas (HG) generated in a high-pressure chamber (3) to the outside through an outlet (7), A high-pressure gas container (2) defines the high-pressure chamber and has an outlet (5) for ejecting the high-pressure gas along a first direction (D1), A gas fuel supply device (8) that supplies gas fuel (F) to the high-pressure chamber, An ignition device (10) for igniting the gas fuel supplied to the high-pressure chamber, The opening degree of the connecting channel connecting the nozzle and the discharge port is defined as follows: 0% opening degree when the connecting channel is blocked by an obstruction, and 100% opening degree when the area open to the connecting channel is maximized due to the movement of the obstruction. The opening timing acquisition device (12) is configured to acquire the opening timing (TX) when the opening degree of the connecting channel reaches 100%. The system includes a delay time setting unit (102) for setting a delay time (TD), and an ignition execution device (100) which includes an ignition unit (104) that causes the ignition device to perform an ignition operation when the delay time has elapsed since the opening timing.

[0065] If the mixing ratio, which is the ratio of the amount of oxygen gas to the amount of gaseous fuel in the high-pressure chamber, is smaller than the theoretical mixing ratio (the ratio of the amount of gaseous fuel to the minimum amount of oxygen gas theoretically required to completely combust that gaseous fuel), that is, if the amount of oxygen gas is small, unburned gas will remain after the generation of a pressure wave. There is a risk that gaseous fuel may remain in the high-pressure chamber or leak to the outside (e.g., into the furnace). Unburned gaseous fuel remaining in the high-pressure chamber is wasted, unnecessarily increasing running costs. Unburned gaseous fuel leaking to the outside may cause unintended malfunctions such as explosions. According to the configuration described in [1] above, from the time the opening of the connection flow path reaches 100% until the delay time has elapsed, the gaseous fuel in the high-pressure chamber is released to the outside, increasing the amount of oxygen available for the combustion of the gaseous fuel. Therefore, even if the mixing ratio in the high-pressure chamber is less than the stoichiometric mixing ratio, the amount of unburned gaseous fuel remaining in the high-pressure chamber and the amount of unburned gaseous fuel leaking to the outside can be reduced, thereby reducing running costs and suppressing the occurrence of unintended malfunctions. Furthermore, since it becomes possible to burn the gaseous fuel at or near the stoichiometric mixing ratio, the effect of the pressure wave can also be enhanced.

[0066] [2] In some embodiments, the configuration described in [1] above, The blockage is a piston (4) for opening or blocking the connecting channel, and has a through hole (21) that extends along a second direction (D2) intersecting the first direction and penetrates along the first direction. The piston housing (6) further comprises a piston housing that houses the piston so that it can reciprocate along the second direction, A 100% opening of the connecting channel is the state in which the area of ​​the through-hole opening to the connecting channel is maximized due to the movement of the piston.

[0067] The configuration described in [2] above can be applied to a pressure wave generator configured such that the connecting passage is opened when the through hole overlaps with the connecting passage due to the movement of the piston. In other words, it is possible to reduce the running costs of this type of pressure wave generator and suppress the occurrence of unintended malfunctions.

[0068] [3] In some embodiments, in the configuration described in [1] or [2] above, The system further includes an oxygen supply device (16) that supplies oxygen gas (O) to the high-pressure chamber, The delay time is set based on the mixing ratio (MR), which is the ratio of the oxygen gas to the gas fuel in the high-pressure chamber, and the ignition pressure (PI) in the high-pressure chamber when the gas fuel and the oxygen gas are supplied to the high-pressure chamber.

[0069] The pressure wave generator produces a pressure wave that changes depending on the delay time, mixture ratio, and ignition pressure. According to the configuration described in [3] above, the delay time is set based on the mixture ratio and ignition pressure, so any desired pressure wave can be generated.

[0070] [4] In some embodiments, in the configuration described in [3] above, The ignition execution device is, The system further includes a storage unit (106) that stores a map (M) showing the relationship between the height of vibration of the surface of an object colliding with the pressure wave and the acceleration of the vibration of the surface, the map including the mixing ratio and the ignition pressure, The delay time setting unit sets the delay time based on the map stored in the storage unit.

[0071] According to the configuration described in [4] above, a map is created to set the delay time from the mixture ratio and ignition pressure, based on past performance and experimental values, and the delay time is set based on this map. This further reduces running costs and further suppresses the occurrence of unintended malfunctions.

[0072] [5] In some embodiments, in the configuration described in any one of [1] to [4] above, The delay time setting unit sets the delay time according to the input value.

[0073] According to the configuration described in [5] above, the worker can arbitrarily adjust the delay time depending on the state of the pressure wave supply destination (for example, the operating state of the boiler or the fuel supplied to the furnace).

[0074] [6] In some embodiments, in the configuration described in any one of [1] to [5] above, The piston housing is configured to restrict the movement of the piston in the second direction when the opening of the connecting passage reaches 100%.

[0075] According to the configuration described in [6] above, the opening of the connecting channel is maintained at 100%, so the desired pressure wave can be generated with higher precision compared to the case where the opening of the connecting channel changes.

[0076] [7] In some embodiments, in the configuration described in any one of [1] to [6] above, The aforementioned delay time is between 0ms and 20ms.

[0077] According to the configuration described in [7] above, it is possible to suppress the pressure wave from becoming too powerful.

[0078] [8] The operating method of the pressure wave generator relating to this disclosure is: A method for operating a pressure wave generator (1) configured to generate a pressure wave by releasing high-pressure gas (HG) generated in a high-pressure chamber (3) to the outside through a discharge port (7), The pressure wave generating device is A high-pressure gas container (2) defines the high-pressure chamber and has an outlet (5) for ejecting the high-pressure gas along a first direction (D1), A gas fuel supply device (8) that supplies gas fuel (F) to the high-pressure chamber, An ignition device (10) for igniting the gas fuel supplied to the high-pressure chamber, The system includes an opening timing acquisition device (12) configured to acquire the opening timing (TX) at which the opening of the connecting channel connecting the nozzle and the discharge port becomes 100%, where the opening of the connecting channel is defined as 0% when the connecting channel is blocked by an obstruction and 100% when the area open to the connecting channel is maximized due to the movement of the obstruction. A delay time setting step (S1) to set the delay time (TD), The system includes an ignition step (S2) in which the ignition device performs an ignition operation after the aforementioned opening timing has occurred and the aforementioned delay time has elapsed.

[0079] According to the method described in [8] above, the gaseous fuel in the high-pressure chamber is released to the outside during the delay period after the opening of the connecting channel reaches 100%, increasing the amount of oxygen available for combustion of the gaseous fuel. As a result, even if the mixture ratio in the high-pressure chamber is less than the stoichiometric mixture ratio, the amount of unburned gaseous fuel remaining in the high-pressure chamber and the amount of unburned gaseous fuel leaking to the outside can be reduced, thereby lowering running costs and suppressing the occurrence of unintended malfunctions. Furthermore, since it becomes possible to burn the gaseous fuel at or near the stoichiometric mixture ratio, the effect of the pressure wave can also be enhanced. [Explanation of symbols]

[0080] 1. Pressure wave generator 2. High-pressure gas containers 3. High-pressure chamber 4 pistons 5 spout 6. Piston storage container 7 Outlet 8. Gas fuel supply device 9. Connection channel 10 Ignition device 11 Emission space 12. Opening timing acquisition device 13 Storage space 14 Discharge nozzles 15 Distribution space 16. Oxygen supply device 18. First Gas Supply Device 19 Entrance 20. Second gas supply device 21 Through hole 22 Atmospheric pressure acquisition device 23 Reduced diameter part 24 Gas fuel supply port 25 Expanded diameter part 26 Oxygen supply port 30 One-sided storage compartment 31 Internal space of one side storage compartment 32 Other side storage compartment 33 Internal space of the other storage compartment 34 One end face of the piston 35 First gas flow hole 36 Opposite surface of one end wall 37 Second gas flow hole 38 One end wall 42 Other end face of the piston 44 Opposite surface of the other end wall 46 Other end wall 50 First gas tank 52. First Gas Line 54. First gas valve 56 Second gas tank 58 Second Gas Line 60. Second gas valve 62 Spark plugs 72. First pressure relief line 74. First pressure relief valve 76. Second pressure relief line 78. Second pressure relief valve 80 Gas fuel tanks 82 Gas fuel line 84 Gas fuel valve 90 Oxygen gas tanks 92 Oxygen Line 94 Oxygen valve 100 Control device 102 Delay time setting section 104 Ignition part 106 Storage section 108 Optimal Condition Setting Unit 110 Input form display section C limit curve D1 1st direction D2 2nd direction F Gas fuel G1 First Gas G2 Second Gas HG High-Pressure Gas M Map MR mixing ratio Oxygen gas O1 Centerline of a high-pressure gas container O2 discharge nozzle centerline P1, P2 points PI ignition pressure PX High-pressure room pressure R Removable area S1 Delay time setting step S2 Ignition Step S11 Injection pressure setting step S12 Mixing ratio setting step TD delay time TX release timing

Claims

1. A pressure wave generator configured to generate a pressure wave by releasing high-pressure gas generated in a high-pressure chamber to the outside through an outlet, A high-pressure gas container having a nozzle for defining the high-pressure chamber and for ejecting the high-pressure gas along a first direction, A gas fuel supply device that supplies gaseous fuel to the high-pressure chamber, An ignition device for igniting the gaseous fuel supplied to the high-pressure chamber, The opening degree of the connecting channel connecting the nozzle and the discharge port is defined as follows: 0% opening degree when the connecting channel is blocked by an obstruction, and 100% opening degree when the area open to the connecting channel is maximized due to the movement of the obstruction. The opening timing acquisition device is configured to acquire the opening timing at which the opening degree of the connecting channel reaches 100%. The system includes a delay time setting unit for setting a delay time, and an ignition execution device including an ignition unit that causes the ignition device to perform an ignition operation when the delay time has elapsed since the release timing, The aforementioned delay time is the time between the opening timing and the execution of the ignition operation during which a portion of the gas fuel in the high-pressure chamber is released from the outlet to the outside of the pressure wave generator, and is between 5 ms and 20 ms. Pressure wave generator.

2. The aforementioned blockage is a piston for opening or blocking the connecting flow path, and has a through hole formed along a second direction intersecting the first direction and penetrating along the first direction. The piston housing container further comprises a piston housing that houses the piston so as to be able to reciprocate along the second direction, A 100% opening of the connecting channel is the state in which the area of ​​the through-hole opening to the connecting channel is maximized due to the movement of the piston. The pressure wave generating device according to claim 1.

3. The system further includes an oxygen supply device that supplies oxygen gas to the high-pressure chamber, The delay time is set based on the mixing ratio, which is the ratio of the oxygen gas to the gas fuel in the high-pressure chamber, and the ignition pressure in the high-pressure chamber when the gas fuel and the oxygen gas are supplied to the high-pressure chamber. A pressure wave generating device according to claim 1 or 2.

4. A pressure wave generating device configured to generate a pressure wave by releasing a high-pressure gas generated in a high-pressure chamber to the outside through an outlet, A high-pressure gas container having a nozzle for defining the high-pressure chamber and for ejecting the high-pressure gas along a first direction, A gas fuel supply device that supplies gaseous fuel to the high-pressure chamber, An ignition device for igniting the gaseous fuel supplied to the high-pressure chamber, The opening degree of the connecting channel connecting the nozzle and the discharge port is defined as follows: 0% opening degree when the connecting channel is blocked by an obstruction, and 100% opening degree when the area open to the connecting channel is maximized due to the movement of the obstruction. The opening timing acquisition device is configured to acquire the opening timing at which the opening degree of the connecting channel reaches 100%. The system includes a delay time setting unit for setting a delay time, and an ignition execution device including an ignition unit that causes the ignition device to perform an ignition operation when the delay time has elapsed since the release timing, The system further includes an oxygen supply device that supplies oxygen gas to the high-pressure chamber, The delay time is set based on the mixing ratio, which is the ratio of the oxygen gas to the gas fuel in the high-pressure chamber, and the ignition pressure in the high-pressure chamber when the gas fuel and the oxygen gas are supplied to the high-pressure chamber. The ignition execution device is The system further includes a storage unit that stores a map showing the relationship between the height of vibration of the surface of an object colliding with the pressure wave and the acceleration of the vibration of the surface, the map including the mixing ratio and the ignition pressure. The delay time setting unit sets the delay time based on the map stored in the storage unit. Pressure wave generator.

5. The delay time setting unit sets the delay time according to the input value. A pressure wave generating device according to claim 1 or 2.

6. The piston housing is configured to restrict the movement of the piston in the second direction when the opening of the connecting passage reaches 100%. The pressure wave generating device according to claim 2.

7. A method for operating a pressure wave generator configured to generate a pressure wave by releasing a high-pressure gas generated in a high-pressure chamber to the outside through an outlet, The pressure wave generating device is A high-pressure gas container having a nozzle for defining the high-pressure chamber and for ejecting the high-pressure gas along a first direction, A gas fuel supply device that supplies gaseous fuel to the high-pressure chamber, An ignition device for igniting the gaseous fuel supplied to the high-pressure chamber, The system includes an opening timing acquisition device configured to acquire the opening timing at which the opening of the connecting channel connecting the nozzle and the discharge port reaches 100%, where the opening of the connecting channel is defined as 0% when the connecting channel is blocked by an obstruction and 100% when the area open to the connecting channel is maximized due to the movement of the obstruction. A delay time setting step to set the delay time, The system includes an ignition step in which, after the aforementioned opening timing has occurred and the aforementioned delay time has elapsed, the ignition device is instructed to perform an ignition operation. The aforementioned delay time is the time between the opening timing and the execution of the ignition operation during which a portion of the gas fuel in the high-pressure chamber is released from the outlet to the outside of the pressure wave generator, and is between 5 ms and 20 ms. Operating method for a pressure wave generator.

8. A method for operating a pressure wave generator configured to generate a pressure wave by releasing a high-pressure gas generated in a high-pressure chamber to the outside through an outlet, The pressure wave generating device is A high-pressure gas container having a nozzle for defining the high-pressure chamber and for ejecting the high-pressure gas along a first direction, A gas fuel supply device that supplies gaseous fuel to the high-pressure chamber, An ignition device for igniting the gaseous fuel supplied to the high-pressure chamber, The system includes an opening timing acquisition device configured to acquire the opening timing at which the opening of the connecting channel connecting the nozzle and the discharge port reaches 100%, where the opening of the connecting channel is defined as 0% when the connecting channel is blocked by an obstruction and 100% when the area open to the connecting channel is maximized due to the movement of the obstruction. A delay time setting step to set the delay time, The system includes an ignition step in which, after the aforementioned opening timing has occurred and the aforementioned delay time has elapsed, the ignition device is instructed to perform an ignition operation. The pressure wave generating device further comprises an oxygen supply device that supplies oxygen gas to the high-pressure chamber, The delay time is set based on the mixing ratio, which is the ratio of the oxygen gas to the gas fuel in the high-pressure chamber, and the ignition pressure in the high-pressure chamber when the gas fuel and the oxygen gas are supplied to the high-pressure chamber. The delay time setting step involves setting the delay time based on a map showing the relationship between the height of vibration of the surface of an object that the pressure wave collides with and the acceleration of the vibration of the surface, the map including the mixing ratio and the ignition pressure. Operating method for a pressure wave generator.

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