Detection device and combustion system

Abstract

To enable back fire to be detected more appropriately in a combustion device in which a number of fuel supply ports are present.SOLUTION: A detection device 10 for detecting back fire in a combustion chamber 31 that combusts fuel supplied from a plurality of supply ports, comprises: a light source 12 that outputs incident light to an optical fiber 11 laid around the plurality of supply ports; a conversion unit 13 that receives return light from the optical fiber 11, and converts the received return light into an electrical signal; a calculation unit 14 that analyzes the return light converted into the electrical signal, and calculates a temperature at a predetermined position of the optical fiber 11; and a detection unit 15 that detects back fire in the combustion chamber 31 based on the calculated temperature.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 fluids such as fuel and air, and the flame travels backward in the fluid. In a gas turbine using natural gas as fuel, although flashback can occur in principle, 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, and hydrogen gas alone as fuel has been increasing in order to realize a hydrogen society. Hydrogen gas has a higher combustion speed than 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 become narrower, 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 called cluster burners has been studied in the combustion device. However, as the hydrogen gas concentration of the fuel increases, it becomes difficult to completely suppress the occurrence of flashback even when using a cluster burner.

[0005] Patent Document 1 describes a combustor including a plurality of temperature detectors that detect the temperatures in a plurality of combustion zones, and a control device. The plurality of temperature detectors include at least one of a thermocouple and an optical pyrometer. The control device is programmed to determine the occurrence of a flashback state in the plurality of combustion zones based on signals from the temperature detectors, and to correct the amount of fuel supplied to the premixing device when the flashback state occurs.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2010-286232 [Overview of the project] [Problems that the invention aims to solve]

[0007] In combustion systems with multiple fuel inlets, such as cluster burners, it is necessary to detect the temperature of each inlet. However, due to the limited space in combustion systems, installing temperature sensors has been difficult in conventional configurations. Furthermore, in conventional configurations, the deterioration of the detection accuracy of the temperature sensors necessitated periodic large-scale maintenance, such as replacement of the temperature sensors. Thus, conventional configurations had room for improvement in terms of properly detecting flashbacks in combustion systems with multiple fuel inlets.

[0008] Therefore, the present disclosure aims to enable more appropriate detection of flashback in combustion devices with multiple fuel supply ports. [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 that burns fuel supplied from multiple supply ports, A light source that outputs incident light to optical fibers laid around the plurality of supply ports, A conversion unit that receives the reflected light from the optical fiber and converts the received reflected light into an electrical signal, A calculation unit that analyzes the reflected light converted into the aforementioned electrical signal and calculates the temperature at a predetermined position in the optical fiber, A detection unit that detects flashback in the combustion chamber based on the calculated temperature, It is equipped with.

[0010] In this way, the detection device calculates the temperature at a predetermined position on the optical fiber based on the reflected light from the optical fiber laid around multiple supply ports and detects flashback. Therefore, even in combustion chambers with many fuel supply ports, such as cluster burners, flashback at each supply port can be detected over a long period of time by arranging optical fibers in a limited space without the need to install numerous sensors.

[0011] In one embodiment, (2) In the detection device of (1), The calculation unit may analyze the reflected light and calculate the temperature at a predetermined number of locations on the optical fiber as the temperature at the predetermined location.

[0012] In this way, the detection device calculates the temperature at multiple predetermined locations along the optical fiber to detect flashback. Therefore, it is possible to measure the temperature at locations where flashback is likely to occur, such as near the fuel supply port, and detect the occurrence of flashback with high accuracy.

[0013] In one embodiment, (3) In the detection device of (1), The calculation unit described above, By analyzing the reflected light continuously measured over a certain time range, the location in the optical fiber where a temperature rise above a certain level is observed is identified. The temperature at the identified location of the optical fiber may be calculated as the temperature at the predetermined location.

[0014] In this way, the detection device analyzes the reflected light, which is continuously measured over a certain time range, to measure the temperature at any point in the optical fiber and detect flashback. Therefore, it is possible to detect flashback based on the temperature at any point on the optical fiber.

[0015] In one embodiment, (4) In any of the detection devices described in (1) to (3), The calculating unit may identify the position in the optical fiber based on the difference between the timing when the incident light is output from the light source and the timing when the return light based on the incident light is received, and calculate the temperature at the identified position.

[0016] In this way, based on the emission timing of the incident light and the reception timing of the return light, the detection device can identify the position of the optical fiber, measure the temperature at any position in the optical fiber, and detect backfire.

[0017] In one embodiment, (5) In any of the detection devices according to (1) to (4), further comprising an optical fiber laid around the plurality of supply ports, the optical fiber may be provided on the fuel supply surface where the plurality of supply ports are provided in the combustion chamber.

[0018] In this way, since the optical fiber is provided on the fuel supply surface, even in a combustion chamber with a large number of fuel supply ports such as a cluster burner, backfire can be appropriately detected with a simple structure.

[0019] In one embodiment, (6) In any of the detection devices according to (1) to (4), further comprising an optical fiber laid around the plurality of supply ports, the optical fiber may be laid around the plurality of supply ports by an adhesive having resistance to a temperature higher than the combustion temperature in the combustion chamber.

[0020] In this way, by using an adhesive having resistance to a temperature higher than the combustion temperature to provide the optical fiber, the optical fiber can be fixed in a combustion chamber heated to a high temperature.

[0021] In one embodiment, (7) In any of the detection devices according to (1) to (4), The system further comprises optical fibers laid around the aforementioned plurality of supply ports, The optical fiber may be laid around the plurality of supply ports by passing it through a guide formed by welding hollow metal.

[0022] In this way, by passing the optical fiber through a metal guide, the optical fiber can be fixed in a combustion chamber that is heated to a high temperature.

[0023] In one embodiment, (8) In any of the detection devices described in (1) to (7), The system may further include a signal output unit that outputs a signal indicating the occurrence of a flashback to a control device that controls the supply of fuel to the plurality of supply ports, in response to the detection unit detecting a flashback in the combustion chamber.

[0024] In this way, upon detecting a flashback, the system notifies the control device that controls the fuel supply of the flashback, allowing the control device to take appropriate action, such as stopping the fuel supply.

[0025] In one embodiment, (9) In any of the detection devices described in (1) to (8), The system may further include a notification unit that notifies the user of the occurrence of a flashback when the detection unit detects a flashback in the combustion chamber.

[0026] In this way, when a flashback is detected, the system notifies the user of the occurrence of the flashback, allowing the user to respond quickly to the flashback, such as by stopping the fuel supply, and prevent accidents.

[0027] Some embodiments of the combustion system include: (10) A combustion chamber for burning fuel supplied from multiple supply ports, A detection device for detecting flashback in the combustion chamber, Equipped with, The detection device is A light source that outputs incident light to optical fibers laid around the plurality of supply ports, A conversion unit that receives the reflected light from the optical fiber and converts the received reflected light into an electrical signal, A calculation unit that analyzes the reflected light converted into the aforementioned electrical signal and calculates the temperature at a predetermined position in the optical fiber, A detection unit that detects flashback in the combustion chamber based on the calculated temperature, It is equipped with.

[0028] In this way, the combustion system detects flashback by calculating the temperature at a predetermined position on the optical fiber based on the reflected light from the optical fiber laid around multiple supply ports. Therefore, even in combustion chambers with multiple fuel supply ports, such as cluster burners, flashback can be detected at each supply port by arranging optical fibers in a limited space without the need for numerous sensors.

[0029] In one embodiment, In the combustion system of (11)(10), The detection device may control the supply of fuel to the supply port in response to the detection of flashback.

[0030] In this way, the combustion system controls the fuel supply in response to flashback detection, thus preventing accidents caused by flashbacks. [Effects of the Invention]

[0031] According to one embodiment of the present disclosure, flashback can be detected more appropriately in a combustion device having multiple fuel supply ports. [Brief explanation of the drawing]

[0032] [Figure 1] This figure shows an example configuration of a combustion system according to one embodiment. [Figure 2] This figure shows an example of a plate included in a cluster burner. [Figure 3]This is a cross-sectional view showing an example of the boundary between the cluster burner and the combustion chamber in Figure 1. [Figure 4] This figure shows an example of a plate equipped with optical fibers. [Modes for carrying out the invention]

[0033] <Comparative Example> The combustion apparatus in the comparative example equipped with cluster burners measures the temperature near each burner using a temperature sensor to detect flashback and control the supply of fuel and air. However, if the temperature sensor is made of thermocouples, a thermocouple and its wiring are required for each burner, and it is difficult to install these thermocouples and wiring in a combustion apparatus with limited space. Therefore, in the combustion apparatus in the comparative example equipped with cluster burners, it was extremely difficult to properly detect flashback using thermocouples.

[0034] Other flashback detection methods include using optical sensors or pressure sensors as temperature detectors. However, the sensitivity of these sensors deteriorates due to the accumulation of deposits, including molten metal, within the combustion device. Specifically, optical sensors lose the ability to transmit light through their light-receiving surface over time. Pressure sensors also experience changes in their sensitivity to pressure due to contamination of the pressure-receiving part. As a result, it is difficult for a combustion device that detects flashback using an optical sensor or pressure sensor to continue detecting flashback over the long term without extensive maintenance.

[0035] Thus, the configuration of the comparative example has room for improvement in terms of properly detecting flashbacks in a combustion device with multiple fuel supply ports. The purpose of this disclosure is to enable the detection of flashbacks over the long term, even in a combustion device equipped with a cluster burner, which can be installed within the limited space in the combustion device and without large-scale maintenance.

[0036] <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.

[0037] 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, a control device 20, and a combustion device 30. The combustion device 30 burns a mixture of air and fuel gas. The control device 20 controls the operation of the combustion device 30, including the supply of air and the mixed gas. The detection device 10 detects flashback in the combustion device 30. Flashback is when the flame inside the combustion chamber 31 moves from the combustion chamber 31 towards the inside of the burner 321 through the fuel nozzle 323 of the burner 321 (see Figure 3).

[0038] The combustion device 30 comprises a combustion chamber 31 and a cluster burner 32. The cluster burner 32 has multiple fuel supply ports (burners 321) 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 cluster burner 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.

[0039] The detection device 10 comprises an optical fiber 11, a light source 12, a conversion unit 13, a calculation unit 14, and a detection unit 15.

[0040] The optical fiber 11 propagates the incident light output from the light source 12 and the reflected light from the incident light. The optical fiber 11 is made of a transparent dielectric material such as quartz glass or plastic. In this embodiment, the detection device 10 is equipped with one optical fiber 11, but the number of optical fibers 11 may be two or more.

[0041] The light source 12 outputs incident light to the optical fiber 11. The light source 12 may be configured, for example, by a laser that generates coherent light.

[0042] The conversion unit 13 converts the light returned from the optical fiber 11 into an electrical signal. The conversion unit 13 may be configured, for example, by a photodiode using a pn junction.

[0043] The calculation unit 14 analyzes the electrical signal of the reflected light to calculate the temperature at any point on the optical fiber 11. Light scattering, such as Brillouin scattering or Raman scattering, occurs in the optical fiber 11. The frequency shift of the scattered light due to Brillouin scattering depends on the temperature of the optical fiber 11 in the region where the scattering occurs. Also, the power of the scattered light due to Raman scattering depends on the temperature of the optical fiber 11 in the region where the scattering occurs. Therefore, the calculation unit 14 may calculate the temperature around the optical fiber 11 based on the amount of frequency shift of the reflected light or the optical power. Depending on the distance from the light source 12, the time from when the detection device 10 receives the incident light until it receives the reflected light will differ. Based on this time, the calculation unit 14 identifies the position on the optical fiber 11 where the temperature is being measured.

[0044] In this embodiment, the calculation unit 14 calculates the temperature using, for example, Brillouin scattered light or Raman scattered light within the optical fiber 11 as the reflected light for calculating the temperature, but other types of reflected light may also be used. However, in high-temperature regions such as around the flame in the combustion chamber 31, the transmission loss of the optical fiber 11 increases. Therefore, in the case of Raman scattered light, the conversion coefficient that converts optical power to temperature changes, which worsens the accuracy of temperature measurement. In contrast, in the case of Brillouin scattered light, the amount of frequency shift is not affected by the transmission loss, so the conversion coefficient that converts the amount of frequency shift to temperature remains unchanged, and the accuracy of temperature measurement does not worsen. Thus, using Brillouin scattered light results in a temperature index that is less likely to change than using Raman scattered light. Therefore, the calculation unit 14 may use Brillouin scattered light as the reflected light to calculate the temperature.

[0045] The detection unit 15 detects flashback based on the temperature calculation result in the calculation unit 14. Specifically, for example, the detection unit 15 may detect the occurrence of flashback at a supply port near a predetermined threshold if the temperature at any position in the optical fiber 11 exceeds that position. The detection unit 15 may also function as a signal output unit that outputs a signal indicating the occurrence of flashback to a control device 20 that controls the supply of fuel to a plurality of burners 321 in response to the detection of flashback in the combustion chamber 31.

[0046] In the configuration described above, the combustion system 1 includes optical fibers 11 laid around multiple supply ports of the cluster burner 32, and analyzes the reflected light in response to the incident light incident on the optical fibers 11 to calculate the temperature at any position on the optical fibers 11 and detect flashback. Therefore, the combustion system 1 makes it possible to appropriately detect flashback in the combustion chamber 31 of the cluster burner 32, which has limited space, over a long period of time without performing large-scale maintenance.

[0047] Figure 2 shows an example of a plate 322 provided in the cluster burner 32 of Figure 1. The cluster burner 32 has a plate 322 with a number of burners 321 on the fuel output surface to the combustion chamber 31. Each burner 321 forms a fuel supply port. In the examples of Figures 1 and 2, the cluster burner 32 has a cylindrical shape centered on the axis L-L', but the shape of the cluster burner 32 is arbitrary.

[0048] Figure 3 is a cross-sectional view showing an example of the boundary between the cluster burner 32 and the combustion chamber 31 in Figure 1. Figure 3 shows a magnified view of a portion of the boundary between the cluster burner 32 and the combustion chamber 31. As shown in Figure 3, the inside of the burner 321 provided on the plate 322 is hollow. Each burner 321 is connected to a fuel nozzle 323 for supplying fuel. The fuel supplied from the fuel nozzle 323 is supplied from the burner 321 to the combustion chamber 31 and combusted.

[0049] Figure 4 shows an example of a plate 322 on which an optical fiber 11 is provided. As shown in Figures 3 and 4, the optical fiber 11 is laid on a plate 322 on which a plurality of burners 321 are provided, so as to pass around some or all of the burners 321.

[0050] In Figure 4, the optical fiber 11 is arranged to surround multiple burners 321 in a circular pattern, but the path of the optical fiber 11 is not limited to this. The temperature around the burners 321 is high. Therefore, the optical fiber 11 may be bonded to the output surface (plate 322) of the multiple burners 321 constituting the cluster burner 32 using a ceramic adhesive with a high heat resistance. Alternatively, the optical fiber 11 may be installed by passing it through a guide formed by welding a hollow metal onto the plate 322. Furthermore, the optical fiber 11 may be coated with a metal such as gold to improve its heat resistance.

[0051] The control device 20 performs appropriate control to prevent or minimize damage to all gas turbine equipment, including the combustion device 30, based on the flashback detection result transmitted from the detection device 10. The control device 20 may be provided, for example, as a fuel supply device that supplies fuel to the burner 321 constituting the cluster burner 32. In this case, when the detection device 10 transmits that a flashback has been detected, the control device 20 makes adjustments such as reducing the amount of fuel supplied to the burner 321 or stopping the fuel supply. However, this is not limited to this, and for example, the control device 20 may be a device that notifies the user of an alarm by sound and light in response to the detection of a flashback. Such a control device 20 may be provided as part of the detection device 10. That is, the detection device 10 may further include a notification unit that notifies the user of the occurrence of a flashback by sound and light in response to the detection unit 15 detecting a flashback in the combustion chamber 31.

[0052] In the configuration described above, the detection device 10 measures temperature and detects flashback as follows: The light source 12 emits light into the optical fiber 11. The conversion unit 13 converts the reflected light from the optical fiber 11 into an electrical signal. The calculation unit 14 calculates the temperature at a predetermined location on the optical fiber 11 (for example, a location around the burner 321) from the electrical signal, and may use this as the temperature measurement value of the detection device 10. The detection unit 15 compares the calculated temperature at the predetermined location with a predetermined temperature threshold, and may determine that flashback has occurred if the calculated temperature is greater than the threshold. When flashback is detected, the detection device 10 communicates to the control device 20 that flashback has been detected at the burner 321 near the predetermined location. Based on the results transmitted from the detection unit 15 of the detection device 10, the control device 20 performs appropriate control to prevent or minimize damage to all gas turbine equipment, including the combustion device 30.

[0053] As described above, the combustion system 1 includes a detection device 10 for detecting flashback in the combustion chamber 31, which burns fuel supplied from multiple supply ports (burners 321). The detection device 10 comprises an optical fiber 11, a light source 12, a conversion unit 13, a calculation unit 14, and a detection unit 15. The light source 12 outputs incident light to the optical fiber 11 laid around the multiple supply ports. The conversion unit 13 receives the reflected light from the optical fiber 11 in response to the incident light and converts the received reflected light into an electrical signal. The calculation unit 14 analyzes the reflected light converted into an electrical signal and calculates the temperature at a predetermined position in the optical fiber 11. The detection unit 15 detects flashback in the combustion chamber 31 based on the calculated temperature.

[0054] Therefore, the detection device 10 can detect flashbacks in multiple burners 321 per optical fiber 11, significantly reducing the number of sensors and wiring required for temperature detection. This allows for the installation of temperature sensors within the limited space of the combustion device 30, even in a combustion device 30 equipped with a cluster burner 32, enabling flashback detection. Furthermore, the detection device 10 included in the combustion system 1 measures the temperature of the optical fiber 11 itself and detects flashbacks from the measurement results. Therefore, even if dirt adheres to the surface of the optical fiber 11, the temperature measurement performance is not affected, and the detection device 10 can continue to detect flashbacks without major maintenance. Thus, by using the detection device 10 and combustion system 1 according to this embodiment, it is possible to continue detecting flashbacks over the long term without major maintenance, even if a cluster burner 32 is included.

[0055] The detection device 10 may analyze the reflected light and calculate the temperature at a predetermined number of locations on the optical fiber 11 as the temperature at the predetermined location, and detect flashback based on that temperature. For example, the detection device 10 may calculate the temperature at a location on the optical fiber 11 near the burner 321 as the temperature at the predetermined location. Therefore, it is possible to measure the temperature at a location where flashback may occur, such as near the fuel supply port (burner 321), and detect the occurrence of flashback with high accuracy.

[0056] Furthermore, the detection device 10 may analyze the reflected light continuously measured over a certain time range to identify a location in the optical fiber 11 where a temperature rise above a certain level is observed. The detection device 10 may calculate the temperature at the identified location in the optical fiber 11 as the temperature at a predetermined location. In this way, the detection device 10 detects flashback by analyzing the reflected light continuously measured over a certain time range, measuring the temperature at an arbitrary location rather than a predetermined location in the optical fiber 11. Therefore, the detection device 10 can detect temperature rises at locations that are difficult to predict in advance, enabling appropriate action to be taken in response to malfunctions such as flashback.

[0057] In associating position and temperature in such an optical fiber 11, the calculation unit 14 of the detection device 10 may determine the position in the optical fiber 11 based on the difference between the timing when incident light is output from the light source 12 and the timing when the reflected light based on the incident light is received, and then calculate the temperature at the determined position. Therefore, the detection device 10 can measure the temperature at any position in the optical fiber 11 and detect flashback.

[0058] Furthermore, the detection device 10 may include optical fibers 11 laid around multiple burners 321. The optical fibers 11 may be provided on the fuel supply surface in the combustion chamber 31 where multiple burners 321 are provided. Therefore, the detection device 10 can appropriately detect flashback with a simple structure even in a combustion device 30 with many fuel supply ports, such as a cluster burner 32.

[0059] The optical fiber 11 may be laid around the multiple burners 321 using an adhesive that can withstand temperatures higher than the combustion temperature in the combustion chamber 31. For example, the optical fiber 11 may be bonded to the plate 322 with a ceramic adhesive. Alternatively, the optical fiber 11 may be laid around the multiple burners 321 by passing it through a guide formed by welding hollow metal. With this configuration, the optical fiber 11 can be fixed even in the combustion chamber 31, which becomes extremely hot.

[0060] Furthermore, the detection device 10 may output a signal indicating the occurrence of a flashback to the control device 20, which controls the supply of fuel to the multiple burners 321, in response to the detection unit 15 detecting a flashback in the combustion chamber 31. Since the detection device 10 notifies the control device 20, which controls the fuel supply, of the occurrence of a flashback in response to the detection of a flashback, the control device 20 can take control measures in response to the flashback, such as stopping the fuel supply.

[0061] Furthermore, the combustion system 1 includes the detection device 10 described above and a combustion chamber 31 for burning fuel supplied from multiple burners 321. The combustion system 1 controls the fuel supply to the burners 321 in response to the detection device 10 detecting a flashback. Therefore, the combustion system 1 can prevent accidents caused by flashbacks.

[0062] 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]

[0063] 1. Combustion System 10 Detection device 11 Optical Fiber 12 light source 13 Conversion section 14 Calculation Section 15 Detection unit 20 Control device 30 Combustion device 31 Combustion chamber 32 Cluster Burner 321 Burner 322 Plate 323 Fuel Nozzle

Claims

1. A detection device for detecting flashback in a combustion chamber that burns fuel supplied from multiple supply ports, Optical fibers laid around the aforementioned plurality of supply ports, A light source that outputs incident light to the optical fiber, A conversion unit that receives the reflected light from the optical fiber and converts the received reflected light into an electrical signal, A calculation unit that analyzes the reflected light converted into the aforementioned electrical signal and calculates the temperature at a predetermined position in the optical fiber, A detection unit that detects flashback in the combustion chamber based on the calculated temperature, Equipped with, The optical fiber is provided on the side of the fuel supply surface plate in the combustion chamber that faces the space where combustion takes place, where the plurality of supply ports are provided. The optical fiber is laid so as to surround some or all of the multiple supply ports. Detection device.

2. The detection device according to claim 1, wherein the calculation unit analyzes the reflected light and calculates the temperature at a plurality of predetermined positions of the optical fiber as the temperature at the predetermined position.

3. The calculation unit described above, By analyzing the reflected light continuously measured over a certain time range, the location in the optical fiber where a temperature rise above a certain level is observed is identified. The temperature at the identified location of the optical fiber is calculated as the temperature at the predetermined location. The detection device according to claim 1.

4. The detection device according to claim 1, wherein the calculation unit determines the position in the optical fiber based on the difference between the timing at which incident light is output from the light source and the timing at which the reflected light based on the incident light is received, and calculates the temperature at the determined position.

5. The system further comprises optical fibers laid around the aforementioned plurality of supply ports, The detection device according to claim 1, wherein the optical fiber is laid around the plurality of supply ports with an adhesive that is resistant to temperatures higher than the combustion temperature in the combustion chamber.

6. The system further comprises optical fibers laid around the aforementioned plurality of supply ports, The detection device according to claim 1, wherein the optical fiber is laid around the plurality of supply ports by passing it through a guide formed by welding hollow metal.

7. The detection device according to claim 1, further comprising a signal output unit that outputs a signal indicating the occurrence of a flashback to a control device that controls the supply of fuel to the plurality of supply ports in response to the detection unit detecting a flashback in the combustion chamber.

8. The detection device according to claim 1, further comprising a notification unit that notifies the user of the occurrence of a flashback in response to the detection unit detecting a flashback in the combustion chamber.

9. A combustion chamber for burning fuel supplied from multiple supply ports, A detection device for detecting flashback in the combustion chamber, Equipped with, The detection device is Optical fibers laid around the aforementioned plurality of supply ports, A light source that outputs incident light to the optical fiber, A conversion unit that receives the reflected light from the optical fiber and converts the received reflected light into an electrical signal, A calculation unit that analyzes the reflected light converted into the aforementioned electrical signal and calculates the temperature at a predetermined position in the optical fiber, A detection unit that detects flashback in the combustion chamber based on the calculated temperature, Equipped with, The optical fiber is provided on the side of the fuel supply surface plate in the combustion chamber that faces the space where combustion takes place, where the plurality of supply ports are provided. The optical fiber is laid so as to surround some or all of the multiple supply ports. Combustion system.

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

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