JP2003130350A - Combustion oscillation suppression device for combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion oscillation suppression device for a combustor that effectively suppresses an unstable combustion oscillation caused in combustion gas. SOLUTION: The combustion oscillation suppression device for a combustor comprises a resonator 2 connected to a combustion cylinder 1, and an arithmetic control part 12 for detecting a pressure fluctuation in combustion gas of the combustion cylinder 1 and controlling the resonator 2 according to the detection signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion vibration suppressing device for a combustor, and more particularly to a combustion vibration suppressing device for a combustor which effectively suppresses unstable combustion vibration generated during combustion of fuel.

[0002]

2. Description of the Related Art In a combustor, for example, a gas turbine combustor for power generation, swirling air is added to fuel injected from a fuel injection section provided at the head of a cylindrical combustion chamber, and the fuel is diffused and swirled for combustion. Along with generating gas, this combustion gas is used as a pilot (fire type) to combust a premixed gas in which air is added to fuel in advance to generate combustion gas for power generation.

This combustion gas is due to a continuous exothermic oxidation reaction between the fuel and air, and at that time, pressure oscillation occurs due to combustion over a frequency of several hundred Hz to several kHz.

Combustion induced by combustion noise caused by turbulent combustion and interaction with fluctuations in flame propagation speed due to heat radiation, diffusion, and swirling due to a time delay from fuel evaporation to combustion. There is vibration.

Combustion vibration grows in a specific vibration frequency range due to resonance with the natural frequency (air column) of the combustion chamber, using the frequency interaction generated in the combustion region of the combustion chamber as a vibration source. is there.

Although the pressure fluctuation due to the combustion vibration is large and small, a high fluctuation value appears especially in a relatively low frequency band region up to 300 Hz.

Further, in recent gas turbine combustors for power generation, it is required to raise the temperature of combustion gas (higher gas turbine inlet temperature), reduce NOx, and diversify fuels. For this reason, the combustor has been improved in structure to cope with high temperature, low NOx, and fuel diversification even at the expense of stable combustion of combustion gas.

However, high temperature, low NOx, and fuel diversification are indispensable for technological innovation. However, if stable combustion of combustion gas is neglected, equipment structure will increase due to increase in combustion oscillation. Abrasion occurs, which adversely affects durability and reliability of life.

For this reason, the combustor has high temperature and low NO.
Along with the x-ization and the diversification of fuel, stable combustion of combustion gas is required, but it is currently being sought.

[0010]

[Problems to be Solved by the Invention] The above-mentioned high temperature and low NO
For a combustor that is operated under severe conditions such as x conversion and fuel diversification, a technique for suppressing combustion oscillation in a low cycle frequency band region has been recently proposed (Japanese Patent Laid-Open No. 6-1474).
No. 85).

In this technique, the combustor inner cylinder is surrounded by a perforated wall cylinder, and the perforated wall cylinder is used as a resonance box to suppress combustion vibration.

[0012] However, although this technique is capable of excellent suppression of combustion vibration in a limited specific frequency band region, it has not been sufficiently applicable over a wide frequency band region.

Generally, the combustor has various operation modes from fuel ignition to rated operation, and the frequency of combustion oscillation is not uniform and fluctuates accordingly.

Therefore, suppression of combustion oscillation in a wide frequency band based on various operation modes is required.

Further, as seen in Japanese Patent Laid-Open No. 6-147485, the perforated wall cylinder as a resonance box has a constant volume and a high suppression of combustion vibration for a specific frequency, but another vibration. When the frequency is reached, resonance may occur rather, and combustion oscillation may increase.

The present invention has been made under such circumstances, and the combustion gas is heated to a high temperature and the combustion gas is reduced in NOx.
Combustion Combustion Suppression Device for Combustor that Suppresses Combustion Vibration Induced by Pressure Fluctuation during Combustion Gas Generation Process of Combustor under Wide Vibration Frequency Band The purpose is to provide.

[0017]

In order to achieve the above-mentioned object, a combustion vibration suppressing device for a combustor according to the present invention, as described in claim 1, combusts fuel to generate combustion gas. A combustion cylinder, a resonance device connected to the combustion cylinder, and a calculation control unit that detects the pressure fluctuation of the combustion gas in the combustion cylinder and controls the resonance device based on the detection signal are provided. .

In order to achieve the above-mentioned object, a combustion vibration suppressing device for a combustor according to the present invention has a combustion cylinder for combusting fuel to generate combustion gas, as set forth in claim 2. A first resonance device and a second resonance device, which are connected in plural along the circumferential direction of the combustion cylinder, and pressure fluctuations of the combustion gas in the combustion cylinder are detected, and the plurality of first resonances are detected based on the detection signal. And an arithmetic control unit for controlling each of the device and the second resonance device.

Further, in order to achieve the above-mentioned object, the combustion vibration suppressing device for a combustor according to the present invention has a resonance chamber which forms a closed chamber, as set forth in claim 3,
A connecting pipe for connecting the resonance chamber to the combustion cylinder and an opening / closing valve interposed in the connecting pipe are provided.

Further, in order to achieve the above-mentioned object, the combustion vibration suppressing device for a combustor according to the present invention, as set forth in claim 4, is characterized in that the resonance chamber has a volume varying mechanism portion for varying the volume. It is housed.

Further, in order to achieve the above-mentioned object, the combustion vibration suppressing device for a combustor according to the present invention, as set forth in claim 5, has a connecting pipe having a flow passage cross-sectional area of small, medium and large. And a second connecting pipe having a flow passage cross-sectional area of "small", a second communication pipe having a flow passage cross-sectional area of "medium", and a third communication pipe having a flow passage cross-sectional area of "large". .

Further, in order to achieve the above-mentioned object, in the combustion vibration suppressing device for a combustor according to the present invention, as described in claim 6, the connecting pipe is divided into a short length, a middle length and a long length. The first connecting pipe having a length “short”, the second connecting pipe having a length “medium”, and the third connecting pipe having a length “long” are provided.

Further, in order to achieve the above-mentioned object, in the combustion vibration suppressing device for a combustor according to the present invention, as described in claim 7, the arithmetic control unit controls the fluctuation of the pressure of the combustion gas in the combustion cylinder. A sensor for detecting, a calculator for converting the detection signal of this sensor into a signal, a valve opening / closing signal is calculated on the basis of the calculation signal of this calculator, and the valve opening / closing signal is calculated between the resonance chamber of the resonance device and the combustion cylinder. And a control device for providing an on-off valve interposed in a connecting pipe connected to each other.

Further, in order to achieve the above-mentioned object, the combustion vibration suppressing device for a combustor according to the present invention, as set forth in claim 8, the resonance device forms a closed chamber and has a variable volume. The resonance chamber that accommodates the variable volume mechanism is connected to the combustion chamber, and the communication pipe is connected to the combustion cylinder with an opening / closing valve interposed therebetween.

Further, in order to achieve the above-mentioned object, in the combustion vibration suppressing device for a combustor according to the present invention, as described in claim 9, the resonance device forms a closed chamber having a constant volume. A resonance chamber, a first communication pipe having a flow passage cross-sectional area of "small" and a second communication pipe having a flow passage cross-sectional area of "small", which is connected to a combustion cylinder and has an opening / closing valve interposed therebetween. , A third connecting pipe having a “large” flow passage cross-sectional area and a connecting pipe divided into three parts.

Further, in order to achieve the above-mentioned object, the combustion vibration suppressing device for a combustor according to the present invention, as set forth in claim 10, the resonance device forms a closed chamber and has a variable volume. Which accommodates the variable volume mechanism part, a first connecting pipe having a small flow passage cross-sectional area of "small", which is connected to the combustion cylinder and has an opening / closing valve interposed in between, and a flow passage cross-sectional area " This is a combination of a second connecting pipe "medium" and a third connecting pipe which is divided into a "large" flow passage cross-sectional area.

Further, in order to achieve the above-mentioned object, in the combustion vibration suppressing device for a combustor according to the present invention, as described in claim 11, the resonance device forms a closed chamber having a constant volume. A resonance chamber and a first communication pipe having a "short" length, which connects the resonance chamber to a combustion cylinder and has an opening / closing valve interposed therebetween.
This is a combination of a second connecting pipe having a "medium" length and a third connecting pipe having a "long" length.

Further, in order to achieve the above-mentioned object, the combustion vibration suppressing device for a combustor according to the present invention, as set forth in claim 12, the resonance device forms a closed chamber and has a variable volume. A resonance chamber that accommodates a variable volume mechanism, a first communication pipe that is connected to the combustion cylinder and has an opening / closing valve in the middle, and a first communication pipe that has a length of “short” and a first communication pipe that has a length of “medium”. It is a combination of two connecting pipes and a connecting pipe that is divided into a third connecting pipe having a length "long".

In order to achieve the above object, the combustion vibration suppressing device for a combustor according to the present invention is characterized in that, as described in claim 13, the variable volume mechanism portion is a piston. It is a thing.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a combustion vibration suppressing device for a combustor according to the present invention will be described below with reference to the drawings and the reference numerals attached to the drawings.

Prior to the description of the combustion vibration suppressing device for a combustor according to the present invention, the inventors first attach a resonance device consisting of a container forming a closed chamber and a connecting pipe to a test combustor, A combustion vibration suppression test was conducted, and the experimental results will be described.

FIG. 2 is a plot of data in the case where the length of the container forming the closed chamber in the test combustor is varied and the length of the connecting pipe (throat) for connecting the container is set to 55 mm. Here, the vertical axis is the pressure fluctuation value expressed as a ratio between the case where there is a resonance chamber and the case where there is no resonance chamber, and the horizontal axis is the length of the resonance device when the diameter of the resonance chamber is 80 mm.

In FIG. 2, it was found that combustion oscillation was significantly suppressed when the length of the resonance chamber was about 100 mm. The frequency at this time was about 275 Hz.

FIG. 3 shows a connecting pipe (throat) having a length of 55 m.
It is data of combustion vibration suppression results when two types of m and 95 mm are used.

In FIG. 3, it was found that when the length of the connecting pipe was 95 mm, the combustion vibration was significantly suppressed when the length of the resonance chamber was 100 mm or less.

FIG. 4 shows a connecting pipe (throat) having a diameter of 5 m.
It is data of a combustion vibration suppression result when two types of m and 24 mm are used.

In FIG. 4, the diameters of the connecting pipes are 5 mm and 24 m.
It was found that when the length was m, the suppression of combustion oscillation was remarkable when the length of the resonance chamber was 100 mm or less.

Although the reason for reducing the combustion vibration is not always clear, it is considered to be related to the resonance vibration frequency f of the resonance device and the combustion vibration frequency in the combustor expressed by the following equation.

[0039]

[Formula 1] f = c / 2π × √1S / (l · v)) (1) where c is the sonic velocity of the gas passing through the connecting pipe (throat), and S is the flow passage cross-sectional area of the connecting pipe. , L is the length of the connecting tube, and v is the volume of the resonator.

From the above equation (1) and the experimental data of FIGS. 1 to 4, the suppression of the combustion vibration of the combustor is not limited to the volume of the resonator, but also the length of the connecting pipe (throat), the connecting pipe (throat).
It was found to be closely related to the cross-sectional area of the channel.

As described above, the inventors of the present invention can suppress the combustion vibration of the combustor by the volume, length and connecting pipe (throat) of the resonance device.
It is a creative addition that pays attention to the fact that it is closely related to the flow path cross-sectional area, length, etc.

An embodiment of a combustion vibration suppressing device for a combustor according to the present invention will be described below.

FIG. 1 is a conceptual diagram showing a first embodiment of a combustion vibration suppressing device for a combustor according to the present invention.

The combustion vibration suppressing device for a combustor according to this embodiment has a structure in which a combustion cylinder 1 is provided with a resonance device 2.

The combustion cylinder 1 is provided with a diffusion combustion passage 3 in the center on the head side, and premixed combustion for supplying a premixed mixture of fuel and air to both sides of the diffusion combustion passage 3 in advance. The passages 4a, 4b and the swirler 5 are provided, and initially,
A premixed gas that is diffused and burned with the fuel supplied to the diffusion combustion passage 3, and the combustion gas resulting from the diffusion combustion is used as a pilot (flame) and is supplied from the premixed combustion passages 4a and 4b and a swirl flow is given by the swirler 5. Are burned to generate combustion gas for power.

On the other hand, the resonance apparatus 2 is attached to a resonance chamber 6 forming a closed chamber, a connecting pipe (throat) 7 connecting the resonance chamber 6 to the combustion cylinder 1, and an intermediate portion of the connecting pipe 7. And an on-off valve 8 for switching.

Further, the resonance device 2 is provided with an arithmetic control unit 12. The calculation control unit 12 includes a sensor 9 for measuring a pressure fluctuation in the combustion cylinder 1, a calculator 10 for converting a pressure fluctuation signal detected by the sensor 9 into, for example, a fast Fourier transform, and the calculator 10. The control device 11 calculates a valve opening signal on the basis of the calculation signal from, and applies the calculated signal to the opening / closing valve 8 to open / close the opening / closing valve 8.

In the combustion vibration suppressing device for a combustor according to the present embodiment having such a configuration, the pressure fluctuation of the combustion gas is detected by the sensor 9 during generation of the combustion gas for power, and is given to the calculator 10. To be The computing unit 10 converts the detection signal into a signal by performing a fast Fourier transform or the like and supplies the signal to the control device 11. When the conversion signal exceeds a predetermined setting, the control device 11 calculates the deviation as a valve opening / closing signal and gives the calculated signal to the opening / closing valve 8 to open / close the combustion vibration generated in the combustion cylinder 1. Suppress.

As described above, in this embodiment, the combustion cylinder 1 is provided with the resonance device 2, and the operation control section 12 for giving a valve opening / closing signal to the opening / closing valve 8 provided in the resonance device 2 is provided. When the temperature rises, the on-off valve 8 is opened and closed, so that combustion vibration can be reliably suppressed under a wide range of vibration frequencies, and stable combustion of the combustion gas is maintained to raise the temperature of the combustion gas, It is possible to reduce NOx and diversify fuel.

FIG. 5 is a conceptual diagram showing a second embodiment of the combustion vibration suppressing device for a combustor according to the present invention. The first
The same parts as those of the embodiment are designated by the same reference numerals.

The combustion vibration suppressing device for a combustor according to the present embodiment accommodates a variable volume mechanism unit 13, specifically a piston, in a resonance chamber 6 forming a closed chamber.

The volume changing mechanism section 13 includes the arithmetic control section 1.
The sensor 9 of 3 detects the pressure fluctuation of the combustion gas, and the detection signal is converted into a signal such as fast Fourier transform by the arithmetic unit 10,
When the conversion signal exceeds a predetermined setting, the controller 11 calculates a valve opening / closing signal and a volume variable mechanism drive signal based on the deviation, and the calculated signal is used as the volume variable mechanism 1
3 and the on-off valve 7 are provided to at least one of them.

As described above, in this embodiment, the volume changing mechanism 13 is housed in the resonance chamber 6, and when the pressure fluctuation of the combustion gas becomes high, at least one of the on-off valve 8 and the volume changing mechanism 13 is changed. Since either one of them is operated, it is possible to reliably suppress combustion oscillation under a wide range of frequencies, maintain stable combustion of combustion gas, and reduce NOx.

FIG. 6 is a conceptual diagram showing a third embodiment of the combustion vibration suppressing device for a combustor according to the present invention. The first
The same parts as those of the embodiment are designated by the same reference numerals.

The combustion vibration suppressing device for a combustor according to the present embodiment is provided with a connecting pipe (throat) 7 for connecting the resonance chamber 6 to the combustion cylinder 1 under a fixed volume of the resonance chamber 6 forming a closed chamber. The flow path cross-sectional area is divided into “small”, “medium”, and “large”, the first communication pipe 14 having a flow path cross-sectional area “small”, the second communication pipe 15 having a flow path cross-sectional area “medium”, the flow path A third connecting pipe 16 having a “large” cross-sectional area is provided, and each connecting pipe 14, 15,
1st on-off valve 17 and 2nd which matched each of the diameters of 16
Each of the on-off valve 18 and the third on-off valve 19 is provided.

As described above, in the present embodiment, the connecting pipe (throat) 7 for connecting the resonance chamber 6 having a constant volume to the combustion cylinder 1.
The first communication pipe 14 having a flow passage cross-sectional area of “small”, the second communication pipe 15 having a flow passage cross-sectional area of “medium”, and the third communication pipe having a flow passage cross-sectional area of “large”.
The communication pipe 16 is divided, and each of the communication pipes 14, 15, 16 is provided with a first opening / closing valve 17, a second opening / closing valve 18, and a third opening / closing valve 19, respectively, so that the pressure fluctuation of the combustion gas is small.
Each valve 1 is operated by the operation signal from the control device 11 according to the medium or large size.
Since at least one of 7, 18 and 19 is opened and closed, combustion vibration can be reliably suppressed under a wide range of frequencies, and stable combustion of combustion gas can be maintained to achieve low NO.
x conversion and the like can be performed.

FIG. 7 is a conceptual diagram showing a fourth embodiment of the combustion vibration suppressing device for a combustor according to the present invention. The first
The same parts as those of the embodiment are designated by the same reference numerals.

The combustion vibration suppressing device for a combustor according to the present embodiment accommodates the volume changing mechanism 13 for changing the volume in the resonance chamber 6 forming a closed chamber, and at the same time, the resonance chamber 6
The first communication pipe 14, which has a flow passage cross-sectional area of "small", which divides the flow passage cross-sectional area of the communication pipe (throat) 7 for connecting the combustion pipe 1 to "small", "medium", and "large" A second connecting pipe 15 having a cross section “medium” and a third connecting pipe 16 having a flow passage cross section “large” are provided, and a first opening / closing valve 17 adapted to each of the diameters of the connecting pipes 14, 15, 16 is provided. Each of the second on-off valve 18 and the third on-off valve 19 is provided.

As described above, in this embodiment, the resonance chamber 6 for accommodating the variable volume mechanism 13 for varying the volume is provided in the combustion cylinder 1.
The connecting pipe (throat) 7 connected to the first connecting pipe 14 having a flow passage cross-sectional area of "small", and the second connecting pipe having a flow passage cross-section of "medium"
The connecting pipe 15 is divided into the third connecting pipe 16 having a large flow passage cross-sectional area, and the connecting pipes 14, 15, 16 are respectively provided with a first opening / closing valve 17, a second opening / closing valve 18, and a third opening / closing valve 19. Each of them is interposed, and at least one of the valves 17, 18 and 19 and the variable volume mechanism 13 is operated by a calculation signal from the control device 11 depending on whether the pressure fluctuation of the combustion gas is small, medium or large. Therefore, it is possible to reliably suppress combustion oscillation under a wide range of frequencies, maintain stable combustion of combustion gas, and reduce NOx and the like.

FIG. 8 is a conceptual diagram showing a fifth embodiment of the combustion vibration suppressing device for a combustor according to the present invention. The first
The same parts as those of the embodiment are designated by the same reference numerals.

The combustion vibration suppressing device for a combustor according to the present embodiment is provided with a connecting pipe (throat) 7 for connecting the resonance chamber 6 to the combustion cylinder 1 under a fixed volume of the resonance chamber 6 forming a closed chamber. Divide the length into "short", "medium", and "long",
The first connecting pipe 20 having a length “short”, the second connecting pipe 21 having a length “medium”, and the third connecting pipe 22 having a length “long” are provided, and each connecting pipe 20, 21, 22 is provided. The first opening / closing valve 23, the second opening / closing valve 24, and the third opening / closing valve 25 are provided.

As described above, in the present embodiment, of the connecting pipes (throats) 7 for connecting the resonance chamber 6 having a constant volume to the combustion cylinder 1, the first connecting pipe 20 having the length “short” and the product “length” are given. It is divided into a second connecting pipe 21 of "medium" and a third connecting pipe 22 of "long", and each of the connecting pipes 20, 21, 22 has a first opening / closing valve 23, a second opening / closing valve 24, and a third opening / closing. Since each of the valves 25 is interposed and at least one of the valves 23, 24, 25 is operated by a calculation signal from the control device 11 according to small, medium, and large fluctuations in the pressure of the combustion gas, Combustion vibration can be reliably suppressed under a wide range of frequencies,
It is possible to reduce NOx and the like while maintaining stable combustion of the combustion gas.

FIG. 9 is a conceptual diagram showing a sixth embodiment of the combustion vibration suppressing device for a combustor according to the present invention. The first
The same parts as those of the embodiment are designated by the same reference numerals.

The combustion vibration suppressing device for a combustor according to the present embodiment accommodates the volume changing mechanism 13 for changing the volume in the resonance chamber 6 forming a closed chamber, and at the same time, the resonance chamber 6
The length of the connecting pipe (throat) 7 for connecting the fuel to the combustion cylinder 1 is divided into "short", "medium", and "long". The first connecting pipe 20 has a length of "short" and the length is "medium". The second connecting pipe 21 and the third connecting pipe 22 having a length “long” are provided, and the first opening / closing valve 23, the second opening / closing valve 24, and the third opening / closing valve 25 are provided in each of the connecting pipes 20, 21 and 22. It is equipped with each.

As described above, in this embodiment, the resonance chamber 6 for accommodating the variable volume mechanism 13 for varying the volume is provided in the combustion cylinder 1.
The connecting pipe (throat) 7 to be connected to is divided into a first connecting pipe 20 having a length “short”, a second connecting pipe 21 having a length “medium”, and a third connecting pipe 22 having a length “long”, Each connecting pipe 20,
The first on-off valve 23 and the second on-off valve 2 are provided on each of 21 and 22.
4, each of the third on-off valve 25 is interposed, and each valve 23, 24, 25 and the variable volume mechanism unit 13 are operated by a calculation signal from the control device 11 depending on whether the pressure fluctuation of the combustion gas is small, medium or large.
Since at least one of them is operated, combustion oscillation can be reliably suppressed under a wide range of frequencies, and stable combustion of combustion gas can be maintained to reduce NOx and the like.

FIG. 10 is a conceptual diagram showing a seventh embodiment of the combustion vibration suppressing device for a combustor according to the present invention. The same parts as those of the first embodiment are designated by the same reference numerals.

The combustion vibration suppressing device for a combustor according to the present embodiment is provided with a plurality of resonance devices, such as the first resonance device 26 and the second resonance device 27, along the circumferential direction of the combustion cylinder 1.

Similar to the first embodiment, both the first resonance device 26 and the second resonance device 27 connect the resonance chambers 28a and 28b forming a closed chamber to the combustion cylinder 1 (throat). 29a, 29b and connecting pipe 29a,
An arithmetic unit 31 and an arithmetic unit 31 which are provided with opening / closing valves 30a and 30b mounted in the middle portion of 29b, and which convert a pressure fluctuation signal detected by a sensor 31 provided in the combustion cylinder 1 into, for example, a fast Fourier transform or the like. The valve opening / closing signal is calculated based on the calculation signal of
It is provided with control devices 32a and 32b which are provided to 30b to open and close the on-off valves 30a and 30b.

In general, combustion vibration is classified into two types, Helmholtz vibration and acoustic vibration, depending on the difference in the natural vibration excited. When the vibration in the combustion cylinder 1 is acoustic vibration, the suppression of combustion vibration is effectively exhibited as shown in the experimental data of FIGS.

However, in the case of the Helmholtz vibration, as shown in FIG.
Although the combustion data is slightly suppressed in the experimental data of FIG. 4, further suppression of combustion vibration is required.

When the Helmholtz vibration is suppressed by the resonance device, for example, when the frequency is 70 Hz, the inside of the combustion cylinder 1 vibrates in substantially the same phase. In this case, the resonance device can suppress only a certain amount of vibration, which is more difficult. Here, when the vibration is examined by frequency, 70Hz
It has been confirmed by experiments that the vibration of can be suppressed by using two or more resonance devices. However, the frequency is 270Hz
Then, it was also found that acoustic vibration occurs and the combustion vibration cannot be suppressed to a predetermined value due to the influence of the acoustic vibration.

In this embodiment, attention is paid to such a phenomenon, and the first resonance device 26 and the second resonance device 2 are provided in the combustion cylinder 1.
7 and a plurality of resonance devices.

Therefore, according to the present embodiment, since the combustion cylinder 1 is provided with the first resonance device 26, the second resonance device 27, and a plurality of resonance devices, it is possible to reliably suppress the Helmholtz vibration in the low frequency band. You can

[0074]

As described above, the combustion vibration suppressing apparatus for a combustor according to the present invention includes a resonance device in the combustion cylinder, and means for varying the volume of the resonance chamber of the resonance device, and the resonance with the combustion cylinder. Since at least one of the means for varying the length and flow passage cross-sectional area of the connecting pipe connecting the device with each other and the means for controlling the air column of the connecting pipe with the opening / closing valve is selected and combined, the combustion cylinder It is possible to reliably suppress internal combustion vibration, prevent wear of the structure and equipment based on the combustion vibration, and contribute to long-life and highly reliable stable combustion operation.

[Brief description of drawings]

FIG. 1 is a first embodiment of a combustion vibration suppressing device for a combustor according to the present invention.
The conceptual diagram which shows embodiment.

FIG. 2 is a pressure fluctuation diagram obtained by an experiment when the length of the resonance chamber is changed.

FIG. 3 is a pressure fluctuation diagram obtained by an experiment when the length of a connecting pipe (throat) that connects the resonance chamber and the combustion cylinder to each other is changed.

FIG. 4 is a pressure fluctuation diagram obtained in an experiment when the flow passage cross-sectional area of a connecting pipe (throat) that connects the resonance chamber and the combustion cylinder to each other is changed.

FIG. 5 is a second part of the combustion vibration suppressing device for a combustor according to the present invention.
The conceptual diagram which shows embodiment.

FIG. 6 is a third embodiment of the combustion vibration suppressing device for a combustor according to the present invention.
The conceptual diagram which shows embodiment.

FIG. 7 is a fourth combustion vibration suppressing device for a combustor according to the present invention.
The conceptual diagram which shows embodiment.

FIG. 8 is a fifth embodiment of the combustion vibration suppressing device for a combustor according to the present invention.
The conceptual diagram which shows embodiment.

FIG. 9 is a sixth embodiment of the combustion vibration suppressing device for a combustor according to the present invention.
The conceptual diagram which shows embodiment.

FIG. 10 is a conceptual diagram showing a combustion vibration suppressing device for a combustor according to a seventh embodiment of the present invention.

[Explanation of symbols]

1 combustion cylinder 2 Resonance device 3 Diffusion combustion passage 4a, 4b premixed combustion passage 5 swallows 6 resonance chamber 7 connecting pipe 8 on-off valve 9 sensors 10 arithmetic unit 11 Control device 12 Arithmetic control unit 13 Volume changing mechanism 14 1st connecting pipe 15 Second connecting pipe 16 Third connecting pipe 17 1st on-off valve 18 Second on-off valve 19 3rd on-off valve 20 First communication pipe 21 Second connecting pipe 22 3rd connecting pipe 23 1st on-off valve 24 Second on-off valve 25 3rd on-off valve 26 First Resonance Device 27 Second Resonance Device 28a, 28b resonance chamber 29a, 29b Communication pipe 30a, 30b open / close valve 31 arithmetic unit 32a, 32b control device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor, Yamanaka             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office (72) Inventor Fukuo Maeda             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba I-Tech Co., Ltd. (72) Inventor Kazunori Shioda             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office (72) Inventor Kazunori Iwabuchi             No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation             Fuchu Office (72) Inventor Sanae Sekita             1-1 Shibaura, Minato-ku, Tokyo Co., Ltd.             Toshiba headquarters office

Claims (13)

[Claims] 1. A combustion cylinder that burns fuel to generate combustion gas, a resonance device connected to the combustion cylinder, a pressure fluctuation of the combustion gas in the combustion cylinder, and the resonance based on the detection signal. A combustion vibration suppressing device for a combustor, comprising: an arithmetic control unit for controlling the device. 2. A combustion cylinder that burns fuel to generate combustion gas, a plurality of first resonance devices and second resonance devices that are connected in plural along the circumferential direction of the combustion cylinder, and combustion gas of the combustion cylinder. And a calculation control unit that controls each of the plurality of first resonance devices and each of the second resonance devices based on the detection signal, and a combustion vibration suppressing device for a combustor. . 3. A resonance device is provided with a resonance chamber forming a closed chamber, a connecting pipe connecting the resonance chamber to a combustion cylinder, and an opening / closing valve interposed in the connecting pipe. The combustion vibration suppressing device for a combustor according to claim 1 or 2. 4. The combustion vibration suppressing device for a combustor according to claim 3, wherein the resonance chamber accommodates a volume varying mechanism portion for varying the volume. 5. The connecting pipe includes a first connecting pipe having a small flow passage cross-sectional area of “small”, a second connecting pipe having a small flow passage cross-sectional area of “medium”, and a second connecting pipe having a small flow passage cross-sectional area of “medium”. Third cross section "large"
The combustion vibration suppressing device for a combustor according to claim 3, further comprising a connecting pipe. 6. The connecting pipe has a first connecting pipe having a length of “short”, a second connecting pipe having a length of “medium”, and a length of “long” that divides the length into short, medium and long. The combustion vibration suppressing device for a combustor according to claim 3, further comprising a third connecting pipe. 7. The arithmetic control unit includes a sensor for detecting a pressure fluctuation of the combustion gas in the combustion cylinder, an arithmetic unit for converting a detection signal of the sensor into a signal, and a valve opening / closing signal based on the arithmetic signal of the arithmetic unit. 3. A control device for calculating and providing a valve opening / closing signal to an on-off valve interposed in a connecting pipe for connecting a resonance chamber of a resonance device and the combustion cylinder to each other. Combustion Vibration Control Device for Combustor. 8. A resonance device has a closed chamber and a resonance chamber for accommodating a variable volume mechanism for varying the volume, and the resonance chamber is connected to a combustion cylinder, and an on-off valve is interposed in the middle of the resonance chamber. The combustion vibration suppressing device for a combustor according to claim 1 or 2, which is combined with a connecting pipe. 9. The resonance device has a resonance chamber forming a closed chamber having a constant volume, and a passage cross-sectional area “small” in which the resonance chamber is connected to a combustion cylinder and an opening / closing valve is interposed midway. 2. A combination of a first connecting pipe, a second connecting pipe having a "medium" flow passage cross-sectional area, and a third connecting pipe having a "large" flow passage cross-sectional area, in combination. Alternatively, the combustion vibration suppressing device for a combustor according to the item 2. 10. A resonance device, wherein a closed chamber is formed and a resonance chamber for accommodating a variable volume mechanism for varying a volume and the resonance chamber are connected to a combustion cylinder, and an on-off valve is interposed in the middle of the resonance chamber. A first connecting pipe having a small flow passage cross-sectional area, a second connecting pipe having a medium flow passage cross-sectional area, and a third connecting pipe having a large flow passage cross-sectional area being combined are combined. The combustion vibration suppressing device for a combustor according to claim 1 or 2, characterized in that. 11. A resonance device comprises: a resonance chamber forming a closed chamber having a constant volume; and the resonance chamber connected to a combustion cylinder,
A first connecting pipe having a length of "short" and a second connecting pipe having a length of "medium" and a third having a length of "long" through which an on-off valve is interposed.
The combustion vibration suppressing device for a combustor according to claim 1 or 2, wherein a connecting pipe and a connecting pipe that is divided into a connecting pipe are combined. 12. A resonance device has a closed chamber and a resonance chamber for accommodating a variable volume mechanism for varying the volume, the resonance chamber is connected to a combustion cylinder, and an on-off valve is interposed in the middle of the resonance chamber. A combination of a first connecting pipe having a "short" length, a second connecting pipe having a "medium" length, and a third connecting pipe having a "long" length. Item 3. A combustion vibration suppressing device for a combustor according to Item 1 or 2. 13. The combustion vibration suppressing device for a combustor according to claim 4, 8, 10 or 12, wherein the variable volume mechanism is a piston.