Detection device and combustion system

Abstract

To enable back fire to be detected more appropriately in a combustion device.SOLUTION: A detection device 10 for detecting back fire in a combustion chamber 31 that combusts fuel supplied from a supply port, comprises: a conduit pipe 11 connected to the inside of the combustion chamber 31 via an opening part 111 provided in a side wall of the combustion chamber 31; a sensor unit 21 that measures a physical quantity inside the combustion chamber 31 via the conduit pipe 11; and a detection unit 22 that detects back fire in the combustion chamber 31 based on a measurement value of the physical quantity measured by the sensor unit 21. The conduit pipe 11 comprises an opening / closing unit 14 capable of opening and closing the internal space between the combustion chamber 31 and the sensor unit 21.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a detection device and a combustion system.

Background Art

[0002] In a gas turbine equipped with a combustion device using a lean premixed combustion method, a detection device for detecting flashback occurring in the combustion device is known. Flashback is a phenomenon in which the speed at which the flame advances is higher than the speed of the fluid such as fuel and air, and the flame travels backward in the fluid. Although flashback can occur in principle in a gas turbine using natural gas as fuel, it is easy to suppress the occurrence of flashback by restricting the operating conditions.

[0003] In recent years, the demand for hydrogen-fired gas turbines using a mixed gas of natural gas and hydrogen gas, as well as hydrogen gas alone as fuel, has been increasing toward the realization of a hydrogen society. Hydrogen gas has a higher combustion speed compared to natural gas. Therefore, in a hydrogen-fired gas turbine, flashback is more likely to occur than in a gas turbine that consumes natural gas as fuel gas. As the concentration of hydrogen gas in the fuel gas increases, the conditions under which flashback does not occur narrow, and it becomes difficult to completely suppress flashback in actual operation.

[0004] For the purpose of suppressing the occurrence of flashback, a combustion device equipped with a number of burners (fuel nozzles) called cluster burners has been studied. However, as the hydrogen gas concentration of the fuel increases, it becomes difficult to completely suppress the occurrence of flashback even when using cluster burners.

[0005] Patent Document 1 describes a combustion control device used in a combustion system that stops the fuel supply to a staging block including a main fuel nozzle in which flashback has occurred based on a detection signal from a flashback detection unit that detects flashback.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] International Publication No. 2015 / 097861 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, the conventional configuration had room for improvement in terms of ease of maintenance and ease of application to combustion devices with a large number of fuel nozzles.

[0008] Therefore, this disclosure aims to enable more appropriate detection of flashbacks in combustion devices. [Means for solving the problem]

[0009] A detection device according to several embodiments is (1) A detection device for detecting flashback in a combustion chamber where fuel supplied from a supply port is burned, A conduit connected to the inside of the combustion chamber through an opening provided in the side wall of the combustion chamber, A sensor unit that measures physical quantities inside the combustion chamber via the aforementioned conduit, A detection unit that detects flashback in the combustion chamber based on the measured value of the physical quantity measured by the sensor unit, Equipped with, The conduit is equipped with an opening / closing section that can open and close the internal space between the combustion chamber and the sensor section.

[0010] In the detection device, the conduit is equipped with an opening / closing section that can open and close the internal space between the combustion chamber and the sensor section. Therefore, it is possible to close the opening / closing section and replace the sensor section while combustion continues in the combustion chamber. Furthermore, since the detection device detects flashback by measuring a physical quantity through an opening on the side of the combustion chamber using the sensor section, it is easily applicable even to large-scale combustion systems equipped with numerous fuel nozzles. Consequently, it becomes possible to detect flashback more appropriately in combustion systems.

[0011] In one embodiment, (2) In the detection device of (1), The conduit may be connected to the interior of the combustion chamber through an opening provided in the side wall of the combustion chamber, downstream of the supply port, and upstream of the reference flame surface that would be generated if the fuel were burned normally in the combustion chamber.

[0012] Thus, since the conduit is connected to the combustion chamber downstream of the fuel supply port and upstream of the standard flame plane that occurs when the fuel burns normally without flashback, the sensor measures physical quantities in a region where the physical quantities change drastically between the absence of flashback and the presence of flashback. Therefore, it is possible to detect the occurrence of flashback with high accuracy.

[0013] In one embodiment, (3) In the detection device of (1) or (2), Based on a comparison between the average value of the measured physical quantity measured by the sensor unit and a predetermined threshold, the necessity of maintenance for the sensor unit is determined. If it is determined that maintenance of the sensor unit is necessary, a notification will be sent indicating that maintenance of the sensor unit is necessary. A proposal section may be added.

[0014] Therefore, the detection device can notify the user if maintenance of the sensor unit is required.

[0015] In one embodiment, (4) In the detection device of (1) or (2), Based on the measured values ​​of the physical quantities measured by the sensor unit, the timing when maintenance of the sensor unit is required is estimated. The estimated time will be notified to the user. A proposal section may be added.

[0016] In this way, the detection device can inform the user when the sensor unit needs maintenance.

[0017] In one embodiment, (5) In any of the detection devices of (1) to (4), the sensor unit may measure temperature, optical spectrum, pressure, or sound pressure inside the combustion chamber.

[0018] Thus, the detection device can detect backfire by realizing the sensor unit with a temperature sensor, an optical spectrum sensor, a pressure sensor, a sound pressure sensor, or the like.

[0019] In one embodiment, (6) In any of the detection devices of (1) to (5), the opening / closing part may be a gate-type or ball-type valve.

[0020] Thus, by realizing the opening / closing part with a gate-type or ball-type valve or the like, when the sensor unit is realized with an optical spectrum sensor, it is possible to prevent the opening / closing part from obstructing the optical path when the opening / closing part is open.

[0021] In one embodiment, (7) In any of the detection devices of (1) to (6), the detection device may further include a signal output unit that outputs a signal indicating backfire occurrence to a control system that controls the supply of the fuel to the supply port in response to the detection of backfire in the combustion chamber.

[0022] Thus, the detection device notifies the control system that controls the fuel supply of the occurrence of backfire in response to the detection of backfire, so that the control system can perform control corresponding to backfire, such as stopping the fuel supply.

[0023] Combustion systems according to some embodiments (8) include a combustion chamber that burns fuel supplied from a supply port, a detection device that detects backfire in the combustion chamber, and the detection device A conduit connected to the inside of the combustion chamber through an opening provided in the side wall of the combustion chamber, A sensor unit that measures physical quantities inside the combustion chamber via the aforementioned conduit, A detection unit that detects flashback in the combustion chamber based on the measured value of the physical quantity measured by the sensor unit, Equipped with, The conduit is equipped with an opening / closing section that can open and close the internal space between the combustion chamber and the sensor section.

[0024] Thus, the combustion system conduit is equipped with an opening / closing section that can open and close the internal space between the combustion chamber and the sensor section, allowing the sensor section to be replaced by closing the opening / closing section while combustion continues in the combustion chamber. Furthermore, since the detection device detects flashback by measuring a physical quantity through an opening on the side of the combustion chamber using the sensor section, it is easily applicable even to large-scale combustion systems equipped with numerous fuel nozzles. Therefore, it becomes possible to detect flashback more appropriately in the combustion system.

[0025] In one embodiment, In the combustion system of (9)(8), The combustion chamber may be supplied with fuel from the discharge ports of a plurality of fuel nozzles, which serve as the fuel supply port.

[0026] Thus, even when fuel is supplied to the combustion chamber from multiple fuel nozzles, flashback can be detected even in large-scale combustion systems by measuring physical quantities inside the combustion chamber through openings provided in the side walls of the combustion chamber.

[0027] In one embodiment, In the combustion system of (10), (8), or (9), The detection device may control the supply of fuel to the supply port in response to the detection of flashback.

[0028] In this way, by controlling the fuel supply in response to flashback detection, accidents caused by flashbacks can be prevented. [Effects of the Invention]

[0029] According to one embodiment of the present disclosure, flashback can be detected more effectively in a combustion device. [Brief explanation of the drawing]

[0030] [Figure 1] This figure shows an example configuration of a combustion system according to one embodiment. [Modes for carrying out the invention]

[0031] <Comparative Example> The combustion apparatus in the comparative example equipped with a cluster burner detects the occurrence of flashback by measuring the temperature near each burner with a temperature detector and controls the supply of fuel and air. Possible methods for detecting flashback by optical means include using an optical sensor or measuring the temperature optically with a thermopile. In such methods, as use continues, dirt from inside the combustion apparatus, including molten metal, adheres to the sensing element, the lens provided in the optical path between the flame (the source of light) and the sensing element, and components intended to protect the sensing element, including a viewing window. As a result, in the combustion apparatus in the comparative example, the light transmittance decreases with continued use, and it may become impossible to properly detect flashback. Therefore, when detecting flashback by such optical means, it is necessary to periodically clean the components provided in the optical path. However, since the components to which dirt adheres inside the combustion apparatus are in contact with the space inside the combustion chamber, cleaning requires large-scale maintenance that involves shutting down the combustion apparatus. In practical operation, it is not possible to perform such maintenance frequently, so it is extremely difficult to continuously detect flashback by optical means.

[0032] Furthermore, in combustion devices equipped with multiple burners, such as hydrogen gas-fueled combustion devices with cluster burners, a temperature sensor and its wiring are required for each burner in order to detect flashback at each burner. Installing such temperature sensors and wiring is difficult within the limited space of a combustion device. Therefore, in the comparative example combustion device, the scope of application of the flashback detection configuration is limited by the number of burners.

[0033] The purpose of this disclosure is to enable proper detection of flashbacks over the long term without major maintenance and without limiting the number of burners in the combustion system.

[0034] <Embodiment> Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, parts having the same configuration or function are denoted by the same reference numerals. In the description of this embodiment, redundant descriptions of the same parts may be omitted or simplified as appropriate.

[0035] Figure 1 shows an example of the configuration of a combustion system 1 according to one embodiment. The combustion system 1 comprises a detection device 10 and a combustion device 30. The combustion device 30 burns a mixture of air and fuel gas. The detection device 10 detects flashback in the combustion device 30. Flashback is when a flame in the combustion chamber 31 moves from the combustion chamber 31 towards the inside of the fuel nozzle 32.

[0036] The combustion device 30 comprises a combustion chamber 31 and a plurality of fuel nozzles 32. Each fuel nozzle 32 has a fuel supply port and supplies a mixture of air and fuel gas to the combustion chamber 31. The combustion chamber 31 has a space for burning the mixture supplied from the fuel nozzles 32. In this embodiment, the fuel is hydrogen gas, but is not limited to this. For example, the fuel may be a mixture of hydrogen gas and natural gas, natural gas, or any fluid that can be used as fuel. In this embodiment, the combustion device 30 comprises a plurality of fuel nozzles 32, but the number of fuel nozzles 32 may be one.

[0037] When the combustion device 30 performs combustion, each fuel nozzle 32 supplies fuel to the combustion chamber 31. In the combustion chamber 31, the supplied fuel is burned, and a flame 80 is formed. The flame 80 has an outer flame 81, an inner flame 82, and a flame surface 83. The outer flame 81 is the region of the flame 80 with a high temperature. The inner flame 82 is the region of the flame 80 with a low temperature. The flame surface 83 is the interface of the flame 80, close to the fuel nozzle 32. Hereinafter, the flame surface 83 when normal combustion is occurring without flashback in the combustion chamber 31 may be referred to as the "reference flame surface". Generally, the outer flame 81, which has a high temperature, is formed near the tip of the flame 80, far from the fuel nozzle 32. The inner flame 82, which has a low temperature, is formed near the flame surface 83, close to the fuel nozzle 32. As will be described later, when flashback occurs, the flame surface 83 moves upstream from the reference flame surface. Therefore, the detection device 10 measures a physical quantity at a position downstream of the end of the fuel nozzle 32 facing the combustion chamber 31, and upstream of the reference flame surface, and detects flashback based on the change in the measured physical quantity.

[0038] The detection device 10 comprises a conduit 11 and a device body 20. The device body 20 comprises a sensor unit 21, a detection unit 22, a proposal unit 23, a control unit 24, and a signal output unit 25.

[0039] The conduit 11 is a hollow member that connects the inside of the combustion chamber 31 to the sensor unit 21 of the device body 20. As shown in Figure 1, the conduit 11 is connected to the inside of the combustion chamber 31 through an opening 111 provided in the side wall of the combustion chamber 31. The conduit 11 is equipped with an opening / closing unit 14 that can open and close the internal space of the conduit 11 between the combustion chamber 31 and the sensor unit 21.

[0040] The sensor unit 21 measures physical quantities inside the combustion chamber 31 through the internal space of the conduit 11. The detection unit 22 detects flashback in the combustion chamber 31 based on the measured values ​​of the physical quantities measured by the sensor unit 21. For example, the sensor unit 21 may be composed of a thermopile (temperature sensor), an optical sensor (light spectrum sensor), a pressure sensor, or an acoustic sensor (sound pressure sensor). A thermopile is a temperature sensor in which a large number of tiny thermocouples that measure temperature by infrared radiation are arranged in a planar manner. A thermopile measures the temperature at a predetermined location across a space. When the sensor unit 21 is composed of a thermopile, the detection unit 22 detects flashback based on the temperature measured by the sensor unit 21. An optical sensor measures light emitted from a predetermined location. When the sensor unit 21 is implemented as an optical sensor, the detection unit 22 detects flashback at a predetermined location from the received light spectrum. A pressure sensor measures the pressure inside the combustion chamber 31. When the sensor unit 21 is implemented using a pressure sensor, the detection unit 22 detects flashback based on the change in pressure. The acoustic sensor measures the sound pressure spectrum. When the sensor unit 21 is implemented using an acoustic sensor, the detection unit 22 detects flashback based on the change in the sound pressure spectrum.

[0041] The opening 111 may be positioned so that the sensor unit 21 and the detection unit 22 can detect flashback by observing the movement of the flame surface 83 within the combustion chamber 31, while the flame surface 83 is visible during normal operation. For example, the opening 111 may be located downstream of the end of the fuel nozzle 32 that constitutes the combustion device 30 that faces the combustion chamber 31, and on the side of the combustion chamber 31 so that a position upstream of the flame surface 83 (reference flame surface) during normal operation can be observed.

[0042] The opening / closing section 14 is a valve that does not obstruct the optical path between the flame 80 in the combustion chamber 31 and the sensor section 21. For example, the opening / closing section 14 may be a gate-type or ball-type valve.

[0043] The suggestion unit 23 suggests to the user when it is time to clean or replace the sensor unit 21. Specifically, the suggestion unit 23 may determine whether maintenance of the sensor unit 21 is necessary based on a comparison between the average value of the physical quantity measured by the sensor unit 21 and a predetermined threshold. If the suggestion unit 23 determines that maintenance of the sensor unit 21 is necessary, it may notify the user that maintenance of the sensor unit 21 is required. For example, the suggestion unit 23 may display an image on the display indicating that maintenance is necessary, or output an alarm sound from the speaker. Alternatively, the suggestion unit 23 may transmit information indicating that maintenance is necessary to the computer used by the user via a predetermined communication means.

[0044] The control unit 24 is one or more processors. The control unit 24 controls the operation of each component of the detection device 10. For example, the control unit 24 may control the opening and closing of the opening / closing unit 14. In addition to controlling the operation of the detection device 10, the control unit 24 may also control the operation of the combustion device 30. For example, the control unit 24 may control the fuel discharged from the fuel nozzle 32 in response to the detection of flashback.

[0045] The signal output unit 25 outputs a signal indicating the occurrence of a flashback to the control system that controls the supply of fuel to the fuel nozzle 32, in response to the detection unit 22 detecting a flashback in the combustion chamber 31.

[0046] Each component of the main body of the device 20 may be realized by a processor executing a program.

[0047] If the temperature of the air in the combustion chamber 31 is higher than the rated temperature of the opening / closing section 14, the distance between the opening / closing section 14 and the combustion chamber 31 may be increased by extending the conduit 11 to an appropriate length in order to lower the temperature of the air in the opening / closing section 14.

[0048] The detection device 10 includes an opening / closing section 14 in the conduit 11 that can open and close the internal space between the combustion chamber 31 and the sensor section 21. Therefore, it is possible to close the opening / closing section 14 and replace the sensor section 21 while combustion in the combustion chamber 31 continues. Furthermore, since the detection device 10 detects flashback by measuring a physical quantity through the sensor section 21 from an opening 111 on the side of the combustion chamber 31, it is easily applicable even to large-scale combustion devices 30 equipped with many fuel nozzles 32. Accordingly, the combustion system 1 makes it possible to appropriately detect flashback over the long term without major maintenance, and without setting an upper limit on the number of fuel nozzles 32 in the combustion device 30.

[0049] The operation of the detection device 10 according to this embodiment will be described in detail below. Flashback refers to the movement of the flame surface 83 towards the fuel nozzle 32.

[0050] When the sensor unit 21 is a thermopile, and the combustion device 30 is performing normal combustion without flashback, the sensor unit 21 measures the temperature of the inner flame 82, which is the lower temperature region in the flame 80. When flashback occurs, the flame surface 83 moves towards the fuel nozzle 32. As a result, the sensor unit 21 measures the temperature of the outer flame 81, which is the higher temperature region in the flame 80. The detection device 10 detects flashback from this change in temperature measurement.

[0051] When the sensor unit 21 is an optical sensor, and the combustion device 30 is performing normal combustion without flashback, the sensor unit 21 measures the light spectrum of the inner flame 82. When flashback occurs, the flame surface 83 moves towards the fuel nozzle 32. As a result, the sensor unit 21 measures the light spectrum of the outer flame 81. The detection device 10 detects flashback from this change in light spectrum.

[0052] When the sensor unit 21 is a pressure sensor, a flashback occurs in the combustion chamber 31, causing a pressure fluctuation in the combustion chamber 31. The detection device 10 then detects the flashback in response to this pressure fluctuation.

[0053] When the sensor unit 21 is an acoustic sensor, if a flashback occurs in the combustion chamber 31, the movement of the flame 80, which exceeds the speed of sound, results in a detonation. Therefore, when a flashback occurs, the ambient sound pressure spectrum changes, and an explosion sound is detected externally. The detection device 10 then detects the flashback in response to measuring the change in the sound pressure spectrum corresponding to such an explosion sound.

[0054] When the detection device 10 is used for a long period of time, contaminants such as molten metal from the combustion chamber 31 adhere to the part of the sensor unit 21 that faces the space inside the combustion chamber 31. As a result, the detection sensitivity of physical quantities such as light (including infrared), pressure, and sound pressure that the sensor unit 21 can measure decreases, and the detection device 10's ability to detect flashback decreases. If the performance of the detection device 10 deteriorates, the opening / closing part 14 may be closed to seal the internal space of the conduit 11. By closing the opening / closing part 14, the sensor unit 21 can be safely removed from the conduit 11 and cleaned, even if the combustion device 30 is in operation. Furthermore, by reattaching the sensor unit 21 to the conduit 11 and opening the opening / closing part 14, the detection device 10 can be operated again.

[0055] As dirt accumulates on the sensor unit 21, the detection sensitivity of the physical quantities that the sensor unit 21 can measure decreases. Therefore, the proposal unit 23 may determine that maintenance is necessary when the average value of the measured physical quantities measured by the sensor unit 21 falls below a predetermined threshold. If the proposal unit 23 determines that maintenance of the sensor unit 21 is necessary, it may notify the user that maintenance of the sensor unit 21 is required. Furthermore, the proposal unit 23 may periodically measure the average value of the measured physical quantities measured by the sensor unit 21, predict when the sensor unit 21 should be replaced based on the change in this average value, and notify the user.

[0056] Furthermore, the sensor unit 21 may include two or more sensors, including a thermopile, optical sensor, pressure sensor, and acoustic sensor, and the detection unit 22 may detect flashback based on the measured values ​​of each sensor. This allows the detection device 10 to detect flashback with high accuracy.

[0057] As described above, the detection device 10 detects flashback in the combustion chamber 31 where fuel supplied from the supply port (fuel nozzle 32) is burned. The detection device 10 comprises a conduit 11, a sensor unit 21, and a detection unit 22. The conduit 11 is connected to the inside of the combustion chamber 31 via an opening 111 provided in the side wall of the combustion chamber 31. The sensor unit 21 measures physical quantities inside the combustion chamber 31 via the conduit 11. The detection unit 22 detects flashback in the combustion chamber 31 based on the measured values ​​of the physical quantities measured by the sensor unit 21. Here, the conduit 11 is equipped with an opening / closing unit 14 that can open and close the internal space between the combustion chamber 31 and the sensor unit 21.

[0058] Thus, the conduit 11 of the detection device 10 is equipped with an opening / closing section 14 that can open and close the internal space between the combustion chamber 31 and the sensor section 21. When the detection device 10 is used for a long period of time, dirt accumulates on the sensor section 21, reducing its ability to detect flashbacks. However, by closing the opening / closing section 14, the sensor section 21 can be removed even while the combustion device 30 is in operation, allowing for cleaning or replacement of the sensor section 21. As a result, the detection device 10 can continue to detect flashbacks over the long term without major maintenance. Furthermore, the detection device 10 can remotely monitor the presence or absence of flashbacks in multiple fuel nozzles 32 via the conduit 11, and there is no need to install wiring inside the combustion device 30. Therefore, the detection device 10 can appropriately detect flashbacks without setting an upper limit on the number of fuel nozzles 32 in the combustion device 30.

[0059] The conduit 11 may also be connected to the inside of the combustion chamber 31 via an opening 111 located on the side wall of the combustion chamber 31, downstream of the supply port (fuel nozzle 32) and upstream of the reference flame surface generated when fuel is burned in the combustion chamber 31. As mentioned above, the reference flame surface is the flame surface 83 when normal combustion is occurring in the combustion chamber 31 without flashback. In this case, the sensor unit 21 measures physical quantities in a region where the physical quantities change drastically between the case where flashback does not occur and the case where flashback occurs. Therefore, with such a detection device 10, it is possible to detect the occurrence of flashback with high accuracy.

[0060] Furthermore, the proposal unit 23 may determine whether maintenance of the sensor unit 21 is necessary based on a comparison between the average value of the physical quantity measured by the sensor unit 21 and a predetermined threshold, and if maintenance is determined to be necessary, it may notify the user accordingly. Maintenance of the sensor unit 21 may include cleaning and replacement of the sensor unit 21. Therefore, with such a configuration, the user can be informed when maintenance of the sensor unit 21 is necessary.

[0061] Furthermore, the proposal unit 23 may estimate when maintenance of the sensor unit 21 will be required based on the measured values ​​of the physical quantities measured by the sensor unit 21, and notify the user of the estimated time. For example, the detection device 10 may acquire change data in advance regarding the change in the measured values ​​of the physical quantities due to the use of the sensor unit 21 over time, and estimate when maintenance will be required by comparing the measured values ​​of the sensor unit 21 with the change data. With such a configuration, the user can know when maintenance of the sensor unit 21 will be required and make a maintenance plan.

[0062] Furthermore, the sensor unit 21 may measure temperature, light spectrum, pressure, or sound pressure inside the combustion chamber 31. With such a configuration, the detection device 10 can detect flashback in the combustion chamber 31 using various physical quantities.

[0063] Furthermore, the opening / closing section 14 may be a gate-type (slide-type) or ball-type (rotating a ball with a hole) valve. By implementing the opening / closing section 14 with a gate-type or ball-type valve, it is possible to detect flashback. Also, if the sensor section 21 is implemented with a thermopile or optical sensor, by implementing the opening / closing section 14 with a gate-type or ball-type valve, it is possible to measure physical quantities without obstructing the optical path. If the sensor section 21 is implemented with a sensor that does not use light, the opening / closing section 14 may be implemented with any valve.

[0064] Furthermore, in response to the detection unit 22 detecting a flashback in the combustion chamber 31, the control unit 24 may output a signal from the signal output unit 25 to the control system that controls the fuel supply to the supply port indicating the occurrence of a flashback. Since the detection device 10 notifies the control system that controls the fuel supply of the occurrence of a flashback in response to the detection of a flashback, the control system can take control measures in response to the flashback, such as stopping the fuel supply.

[0065] Furthermore, in the combustion system 1, the combustion chamber 31 may be supplied with fuel from the discharge ports of multiple fuel nozzles 32, serving as a fuel supply port. Even when fuel is supplied to the combustion chamber 31 from multiple fuel nozzles 32, the combustion system 1 detects flashback by measuring physical quantities inside the combustion chamber 31 through an opening 111 provided in the side wall of the combustion chamber 31. Therefore, the combustion system 1 makes it possible to detect flashback even in a large-scale combustion device 30.

[0066] Furthermore, the combustion system 1 may control the fuel supply to the supply port in response to the detection device 10 detecting a flashback. In this way, the combustion system 1 controls the fuel supply in response to flashback detection, thereby preventing accidents caused by flashbacks.

[0067] This disclosure is not limited to the embodiments described above. For example, multiple blocks shown in the block diagram may be merged, or a single block may be divided. Other modifications are possible without departing from the spirit of this disclosure. [Explanation of symbols]

[0068] 1. Combustion System 10 Detection device 11 Conduit 111 Opening 14 Opening / Closing Section 20 Main unit of the device 21 Sensor section 22 Detection unit 23 Proposal Department 24 Control Unit 25 Signal output section 30 Combustion device 31 Combustion chamber 32 Fuel Nozzles 80 Flames 81. External inflammation 82 Internal inflammation 83 Flame Mask

Claims

1. A detection device for detecting flashback in a combustion chamber that burns fuel supplied from a supply port, A conduit connected to the interior of the combustion chamber via an opening located in the side wall of the combustion chamber, downstream of the supply port and upstream of the reference flame surface that would be generated if the fuel were burned normally in the combustion chamber; A sensor unit that measures a physical quantity including at least one of light spectrum, pressure, and sound pressure inside the combustion chamber via the conduit, A detection unit that detects flashback in the combustion chamber based on the measured value of the physical quantity measured by the sensor unit, Equipped with, The conduit is equipped with an opening / closing section that can open and close the internal space between the combustion chamber and the sensor section. Detection device.

2. The detection device according to claim 1, wherein the combustion chamber is supplied with fuel from the discharge ports of a plurality of fuel nozzles as the fuel supply port.

3. Based on a comparison between the average value of the measured physical quantity measured by the sensor unit and a predetermined threshold, the necessity of maintenance of the sensor unit is determined. If it is determined that maintenance of the sensor unit is necessary, a notification will be sent indicating that maintenance of the sensor unit is necessary. The detection device according to claim 1 or 2, further comprising a proposed section.

4. Based on the measured values ​​of the physical quantities measured by the sensor unit, the timing when maintenance of the sensor unit is required is estimated. The estimated time will be notified to the user. The detection device according to claim 1 or 2, further comprising a proposed section.

5. The detection device according to claim 1 or 2, wherein the opening / closing part is a gate-type or ball-type valve.

6. The detection device according to claim 1 or 2, further comprising a signal output unit that outputs a signal indicating the occurrence of a flashback to a control system that controls the supply of fuel to the supply port, in response to the detection unit detecting a flashback in the combustion chamber.

7. A combustion chamber for burning the fuel supplied from the supply port, A detection device for detecting flashback in the combustion chamber, Equipped with, The detection device is A conduit connected to the interior of the combustion chamber via an opening located in the side wall of the combustion chamber, downstream of the supply port and upstream of the reference flame surface that would be generated if the fuel were burned normally in the combustion chamber; A sensor unit that measures a physical quantity including at least one of light spectrum, pressure, and sound pressure inside the combustion chamber via the conduit, A detection unit that detects flashback in the combustion chamber based on the measured value of the physical quantity measured by the sensor unit, Equipped with, The conduit is equipped with an opening / closing section that can open and close the internal space between the combustion chamber and the sensor section. A combustion system.

8. The combustion system according to claim 7, wherein the combustion chamber is supplied with fuel from the discharge ports of a plurality of fuel nozzles as the fuel supply port.

9. The combustion system according to claim 7 or 8, wherein the detection device controls the supply of the fuel to the supply port in response to the detection of a flashback.

Images