Burner system and combustion control method thereof

Abstract

Provided is a combustor system including a main combustor to which a fuel gas containing a non-active gas is supplied, and a pilot combustor for stabilizing a flame of the main combustor, the combustor system including a first analysis section configured to analyze the fuel gas supplied to the main combustor and acquire information related to a component of the fuel gas, and a flow rate adjustment device configured to adjust flow rates of the fuel gas and air supplied to the pilot combustor based on the information related to the component of the fuel gas.

Description

TECHNICAL FIELD

[0001] The present application relates to a combustor system and a combustion control method thereof.

[0002] This application is based on Japanese Patent Application No. 2021-029868 filed on February 26, 2021 with the Japan Patent Office, the contents of which are incorporated herein by reference in its entirety. BACKGROUND

[0003] Patent Literature 1 discloses a fuel adjusting device for a boiler, which is provided with a sensor that detects the amount of coal dust, nitrogen oxides, oxygen, or carbon monoxide in the exhaust gas of the boiler, and an adjusting valve that adjusts the fuel supply amount to the combustor based on the detection signal of the sensor.

[0004] Patent Literature 2 describes that, in order to achieve stable operation of a gas turbine power generation system, the heat of fuel gas is measured, and based on the heat, a heat-reducing gas or a heat-increasing gas is added.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2008-157553

[0008] Patent Literature 2: Japanese Patent Application Publication No. 2004-190633

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] However, in a case where a fuel having a high content of non-active gas is used as the fuel of the main combustor, a pilot combustor can be used in order to stabilize the flame of the main combustor. In this case, in a case where the composition of the non-active gas changes, there is a possibility that combustion failure or flameout occurs. As a countermeasure to this, it can be considered to increase the combustion amount of the pilot combustor, but the excessive supply of fuel leads to an increase in fuel cost and the like, and thus is not preferable. In addition, the structures described in Patent Literatures 1 and 2 do not have a pilot combustor, and thus the adjustment of the combustion amount of the pilot combustor is not disclosed. SUMMARY

[0011] In view of the above, an object of the present application is to provide a combustor system and a control method thereof, which, for a combustor system provided with a main combustor that uses a fuel containing a non-active gas and a pilot combustor, can achieve stable combustion of the main combustor and can suppress the supply of excessive fuel to the pilot combustor.

[0012] MEANS FOR SOLVING THE PROBLEMS

[0013] To achieve the above object, a combustor system according to at least one embodiment of the present application is provided with:

[0014] a main burner supplied with a first fuel gas containing a non-active gas;

[0015] a pilot burner for stabilizing a flame of the main burner;

[0016] a first analysis section configured to analyze the first fuel gas supplied to the main burner and acquire information related to a component of the first fuel gas; and

[0017] a flow rate adjustment device configured to adjust flow rates of a second fuel gas and air supplied to the pilot burner based on the information related to the component of the first fuel gas acquired by the first analysis section.

[0018] To achieve the above object, a combustion control method of a burner system according to at least one embodiment of the present application includes:

[0019] The burner system includes:

[0020] a main burner supplied with a first fuel gas containing a non-active gas; and

[0021] a pilot burner for stabilizing a flame of the main burner,

[0022] The combustion control method of the burner system includes:

[0023] an analysis step of analyzing the first fuel gas supplied to the main burner and acquiring information related to a component of the first fuel gas; and

[0024] a flow rate adjustment step of adjusting flow rates of a second fuel gas and air supplied to the pilot burner based on the information related to the component of the first fuel gas acquired by the analysis step.

[0025] Effects of the Invention

[0026] According to the present application, a burner system and a control method thereof are provided, which enable stable combustion of a main burner and suppress supply of excess fuel to a pilot burner for a burner system including the main burner and the pilot burner using a fuel containing a non-active gas. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic configuration view of a boiler 100 including a burner system 4 according to an embodiment.

[0028] Figure 2is a schematic side sectional view showing an example of the structure of the burner device 6.

[0029] Figure 3 is Figure 2 is a schematic front view of the burner device 6 (a view observed from inside the fire place 2).

[0030] Figure 4 is a view showing an example of the hardware structure of the combustion control device 24.

[0031] Figure 5 is a schematic view showing an example of the combustion control flow of the combustion control device 24 based on the above-described burner system 4.

[0032] Figure 6 is a view showing an example of a map showing the relationship between the load of the boiler 100 and the flow rate of the pilot fuel gas.

[0033] Figure 7 shows an example of the combustion control based on the combustion control device for the combustion state determined by combining the concentration of methane, the concentration of air, and the concentration of CO2 in the combustion region of the burner device 6.

[0034] Figure 8 is a view for explaining the observation method of the concentrations of methane, air, and CO2 in Figure 7

[0035] Figure 9 is a schematic view showing another example of the combustion control flow of the combustion control device 24 based on the burner system 4. DETAILED DESCRIPTION

[0036] Hereinafter, several embodiments of the present application will be described with reference to the drawings. However, the sizes, materials, shapes, relative arrangements, and the like of the constituent components described as the embodiments or shown in the drawings are not intended to limit the scope of the application, but are merely illustrative.

[0037] For example, expressions such as "to a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" indicating relative or absolute arrangement, in addition to indicating a state of being strictly arranged like this, also indicate a state of being relatively displaced by an angle, a distance, or the like having a tolerance or capable of obtaining the same function to some extent.

[0038] For example, expressions such as "same", "identical", and "equivalent" indicating a state of being equal, in addition to indicating a state of being strictly equal, also indicate a state of having a difference to some extent having a tolerance or capable of obtaining the same function.

[0039] ​For example, the expression of the shape such as a quadrangular shape, a cylindrical shape, and the like indicates not only the shape of a quadrangular shape, a cylindrical shape, and the like in a strict geometrical sense, but also a shape including a concave-convex portion, a chamfered portion, and the like in a range in which the same effect can be obtained.

[0040] On the other hand, the expressions such as "provided with", "have", "complete", "include", or "contain" are not exclusive expressions that exclude the presence of other constituent elements.

[0041] Figure 1 is a schematic configuration view of a boiler 100 including a burner system 4 according to an embodiment.

[0042] As shown in Figure 1 , the boiler 100 is provided with a furnace 2 and the burner system 4. The purpose of the boiler 100 is not particularly limited, but the boiler 100 can be, for example, a boiler for a ship.

[0043] The burner system 4 includes a burner device 6, a main fuel line 8, an air line 10, a pilot fuel line 12, an exhaust line 13, a flow control valve 14, a flow meter 15, a fan 16, a flow control valve 18, a flow meter 19, a first analyzer 20, a second analyzer 22, and a combustion control device 24.

[0044] First, an example of the structure of the burner device 6 will be described with reference to Figure 2 and Figure 3 . Figure 2 is a schematic side cross-sectional view showing an example of the structure of the burner device 6, Figure 3 is Figure 2 a schematic front view of the burner device 6 shown in

[0045] As shown in Figure 2 and Figure 3 , the burner device 6 includes a burner main body 25, a bellows 26, a pilot gas nozzle 30 disposed at the center of the burner main body 25, a plurality of main gas nozzles 28 (six main gas nozzles 28 in the illustrated example) disposed around the pilot gas nozzle 30 along the pilot gas nozzle 30, and an air flow path 29 disposed in the burner main body 25, and a swirl flow generator 32 that forms a swirling flow of air at the outlet of the burner device 6. The pilot gas nozzle 30 and the air flow path 29 around the pilot gas nozzle 30 in the burner main body 25 constitute a pilot burner 36, and the plurality of main gas nozzles 28 and the air flow path 29 around each of the main gas nozzles 28 in the burner main body 25 constitute a main burner 34.

[0046] Each of the main gas nozzles 28 is connected to the main fuel line 8 (see Figure 1) connected to the main fuel line 8, injects the main fuel gas containing non-active gas supplied from the main fuel line 8 toward inside the firebox 2. The main fuel gas contains a hydrocarbon gas such as methane and CO2 as non-active gas. The pilot gas nozzle 30 is connected to the pilot fuel line 12 (refer to Figure 1 ) connected to the pilot fuel line 12, injects the pilot fuel gas supplied from the pilot fuel line 12 toward inside the firebox 2. The pilot fuel gas contains a hydrocarbon gas such as methane. The proportion of non-active gas in the pilot fuel gas is smaller than that in the main fuel gas, or is 0. The air box 26 is connected to the air line 10 (refer to Figure 1 ) connected to the air line 10, and air supplied from the air line 10 to the air box 26 is supplied to the firebox 2 as a swirling flow by the swirler 32.

[0047] The main burner 34 injects the main fuel gas containing CO2 supplied from the main fuel line 8 from the plurality of main gas nozzles 28, burns by mixing with the swirling flow of air generated by the swirler 32, thereby forming a flame. The pilot burner 36 injects the pilot fuel gas supplied from the pilot fuel line 12 from the pilot gas nozzle 30, burns by mixing with the swirling flow of air generated by the swirler 32, thereby forming a flame, and stabilizes the flame of the main burner 34.

[0048] Returning to Figure 1 , the main fuel line 8 is provided with a flow control valve 14, a flow meter 15, and a first analyzer 20. The flow control valve 14 is configured to be able to adjust the flow rate of the main fuel gas supplied from the main fuel line 8 to the main burner 34. The flow meter 15 is configured to measure the flow rate of the main fuel gas supplied to the main burner 34. The type of the flow meter 15 is not particularly limited, and for example, can be a Coriolis flow meter, a differential pressure flow meter, or an ultrasonic flow meter. The first analyzer 20 analyzes the main fuel gas supplied to the main burner 34, and acquires information related to the components of the main fuel gas. The first analyzer 20 acquires information related to the components of the main fuel gas, such as the concentrations of various hydrocarbon compounds (methane, ethane, and propane) contained in the main fuel gas and the concentration of CO2 contained in the main fuel gas, as information related to the components of the main fuel gas. In addition, the first analyzer 20 can be, for example, an IR (infrared) type, or can be a gas chromatograph.

[0049] The fan 16 is provided in the air line 10, and the supply amount of air to the burner device 6 is adjusted by controlling, for example, the rotation speed of the fan 16 by the combustion control device 24 described later in correspondence with the fuel supply amount to the burner device 6. The supply amount of air to the burner device 6 can also be adjusted by providing a non-illustrated vane downstream of the fan 16 and adjusting the opening of the vane, in which case the combustion control device 24 adjusts the opening of the vane in correspondence with the fuel supply amount to the burner device 6.

[0050] The pilot fuel line 12 is provided with a flow control valve 18 and a flow meter 19. The flow control valve 18 is configured to be able to adjust the flow rate of the pilot fuel gas supplied from the pilot fuel line 12 to the pilot burner 36. The flow meter 19 is configured to measure the flow rate of the pilot fuel gas supplied to the pilot burner 36. The type of the flow meter 19 is not particularly limited, and can be, for example, a Coriolis flow meter, a differential pressure flow meter, or an ultrasonic flow meter, etc.

[0051] The exhaust line 13 is provided with a second analyzer 22. The second analyzer 22 analyzes the exhaust gas of the boiler 100 flowing in the exhaust line 13, and acquires the concentration of the unburned fuel component contained in the exhaust gas (for example, the concentration of unburned HC and the concentration of CO in the exhaust gas). The second analyzer 22 can be, for example, an IR (infrared) type, or a gas chromatograph.

[0052] The combustion control device 24 is configured to control the combustion state of the burner device 6. The combustion control device 24 is input with the outputs of the flow meter 15, the flow meter 19, the first analyzer 20, and the second analyzer 22. The combustion control device 24 controls the fan 16, the flow control valve 14, and the flow control valve 18 based on the input information, thereby achieving stable combustion of the main burner 34, and suppressing the manner of supplying excess fuel to the pilot burner 36, and controls the combustion state of the burner device 6. Details of the combustion control based on the combustion control device 24 will be described later.

[0053] Further, in the above-described exemplary embodiment, the above-described main fuel line 8, the air line 10, the pilot fuel line 12, the flow control valve 14, the flow meter 15, the fan 16, the flow control valve 18, the flow meter 19, the first analyzer 20, the second analyzer 22, and the combustion control device 24 constitute a flow adjustment device 60.

[0054] Figure 4 is a diagram showing an example of the hardware configuration of the combustion control device 24. Figure 5 is a diagram showing an example of the combustion control flow of the combustion control device 24 based on the above-described burner system 4.

[0055] As Figure 4As shown, the combustion control device 24 is configured, for example, using a computer. This computer includes a processor 72, RAM (Random Access Memory) 74, ROM (Read Only Memory) 76, HDD (Hard Disk Drive) 78, input I / F 80, and output I / F 82, and these components are connected to each other via a bus 84. Furthermore, the hardware structure of the combustion control device 24 is not limited to the above; it can also be configured using a combination of control circuitry and storage devices. Additionally, the combustion control device 24 is configured by the computer executing programs that implement the various functions of the combustion control device 24. The functions of each part of the combustion control device 24, as described below, are implemented, for example, by reading programs stored in ROM 76 from RAM 74 and executing them with the processor 72, and by reading and writing data from RAM 74 and ROM 76.

[0056] Figure 5 The illustrated combustion control device 24 includes: a mapping selection unit 40, a storage unit 42, a pilot target flow calculation unit 44, a PID control unit 46, a main target flow calculation unit 48, a PID control unit 50, an alarm signal generation unit 52, and a boiler stop signal generation unit 54.

[0057] The mapping selection unit 40 selects from multiple mappings stored in the storage unit 42 representing the relationship between the boiler 100 load and the pilot fuel gas flow rate, which are ranges of CO2 concentration for each main fuel gas, the mapping corresponding to the CO2 concentration obtained by the first analyzer 20 (see reference). Figure 6 ).exist Figure 5 In the example shown, three mappings corresponding to the three ranges (high concentration, medium concentration, and low concentration) of CO2 concentration contained in the main fuel gas are stored in the storage unit 42, and the mapping corresponding to the CO2 concentration obtained by the first analyzer 20 is selected from the three mappings.

[0058] The pilot target flow rate calculation section 44 changes the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fpo of the pilot fuel gas determined in accordance with the map selected by the map selection section 40 and the load of the boiler 100, based on the difference (X1-C) between the concentration X1 of CO2 contained in the main fuel gas acquired by the first analyzer 20 and the reference concentration C of each of the maps selected. That is, the larger the difference (X1-C) between the concentration X1 of CO2 contained in the main fuel gas acquired by the first analyzer 20 and the reference concentration C of each of the maps selected by the map selection section 40, the more the pilot target flow rate calculation section 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fpo of the pilot fuel gas determined in accordance with the map selected by the map selection section 40 and the load of the boiler 100. The flow rate of the pilot fuel gas is optimized by feedback control based on the concentration X1 of CO2. In several embodiments, until the above difference (X1-C) exceeds a first threshold value, the pilot target flow rate calculation section 44 takes the flow rate Fpo of the pilot fuel gas determined in accordance with the map selected by the map selection section 40 and the load of the boiler 100 as the target flow rate Fpt of the pilot fuel gas, and in the case where the above difference (X1-C) exceeds the first threshold value, it is also possible that the larger the above difference (X1-C), the more the pilot target flow rate calculation section 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the above flow rate Fpo of the pilot fuel gas. Thereby, it is possible to suppress excessively frequent changes in the target flow rate Fpt, and thus it is possible to stabilize the combustion state. Furthermore, the above first threshold value can be set to a value corresponding to a point at which it is considered that the combustion state changes in the direction of deterioration, for example.

[0059] Further, in a case where at least one of the unburned fuel components contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 and the components generated at the time of poor combustion, which are acquired by the second analyzer 22, exceeds a threshold value of each of the components, the pilot target flow rate calculation section 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection section 40 and the load of the boiler 100. For example, in a case where the concentration X2 of unburned HC contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13, which is acquired by the second analyzer 22, exceeds a second threshold value, the pilot target flow rate calculation section 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection section 40 and the load of the boiler 100. Here, the second threshold value is the concentration of unburned HC determined to be poor combustion. Further, in a case where the concentration X3 of CO contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13, which is acquired by the second analyzer 22, exceeds a third threshold value, the pilot target flow rate calculation section 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection section 40 and the load of the boiler 100. Here, the third threshold value is the concentration of CO determined to be poor combustion. The flow rate of the pilot fuel gas is optimized by feedback control based on the concentrations of the unburned fuel components and the concentrations of the components generated at the time of poor combustion contained in the exhaust gas of the boiler 100.

[0060] The PID control section 46 performs PID control of the opening degree of the flow rate control valve 18 as an operation object based on the target flow rate Fpt output from the pilot target flow rate calculation section 44 and the flow rate of the pilot fuel gas measured by the flowmeter 19, thereby adjusting the flow rate of the pilot fuel gas supplied to the pilot burner 36.

[0061] The main target flow rate calculation section 48 calculates the target flow rate Fmt of the main fuel gas supplied to the main burner 34 by subtracting the target flow rate Fpt output from the pilot target flow rate calculation section 44 from the fuel flow rate (fuel demand) determined in accordance with the demand of steam of the boiler 100 through heat conversion.

[0062] The PID control section 50 performs PID control of the flow rate control valve 14 as an operation object based on the target flow rate Fmt output from the main target flow rate calculation section 48 and the flow rate of the main fuel gas measured by the flowmeter 15, thereby adjusting the flow rate of the main fuel gas supplied to the main burner 34.

[0063] In a case where the difference (X1-C) between the concentration X1 of CO2 acquired by the first analyzer 20 and the reference concentration C of each of the maps selected by the map selection section 40 exceeds a fourth threshold value, the alarm signal generation section 52 generates an alarm signal for warning the possibility of occurrence of misfire. Further, the fourth threshold value is a value larger than the first threshold value. In addition, in a case where the concentration (for example, the above-mentioned concentration X2) of unburned fuel components contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds a fifth threshold value, the alarm signal generation section 52 generates an alarm signal for warning the possibility of occurrence of misfire. Further, the fifth threshold value is a value larger than the second threshold value. In a case where the concentration (for example, the above-mentioned concentration X3) of components generated at the time of misburning contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds a sixth threshold value, the alarm signal generation section 52 generates an alarm signal for warning the possibility of occurrence of misfire. Further, the sixth threshold value is a value larger than the third threshold value. In addition, the alarm signal can be a signal for causing a display or the like not shown to display a warning, can be a signal for causing an alarm or the like to operate, or can be a signal for causing other warning means to operate.

[0064] In a case where the difference (X1-C) between the concentration X1 of CO2 acquired by the first analyzer 20 and the reference concentration C of each of the maps selected by the map selection section 40 exceeds a seventh threshold value, the boiler stop signal generation section 54 generates a boiler stop signal for stopping the operation of the boiler 100. The seventh threshold value is a value larger than the fourth threshold value. In addition, in a case where the concentration (for example, the above-mentioned concentration X2) of unburned fuel components contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds an eighth threshold value, the boiler stop signal generation section 54 generates a boiler stop signal for stopping the operation of the boiler 100. Further, the eighth threshold value is a value larger than the fifth threshold value. In a case where the concentration (for example, the above-mentioned concentration X3) of components generated at the time of misburning contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds a ninth threshold value, the boiler stop signal generation section 54 generates a boiler stop signal for stopping the operation of the boiler 100. Further, the ninth threshold value is a value larger than the sixth threshold value. The boiler stop signal is transmitted to each device related to the operation of the boiler 100, and the operation of the boiler 100 is stopped.

[0065] Here, the effects of the above-mentioned burner system 4 will be described.

[0066] Conventionally, the combustion amount of the pilot burner is determined by a planned value (design value), and an operator determines whether misburning occurs, and if misburning occurs, the operator manually adjusts the fuel supply amount and the air amount of the pilot burner.

[0067] According to the above-described combustor system 4, the flow rate of the pilot fuel gas and the flow rate of the air supplied to the pilot combustor 36 are automatically adjusted on the basis of the information on the composition of the main fuel gas acquired by the first analyzer 20, and thus the combustion amount of the pilot combustor 36 is adjusted. Thereby, it is possible to suppress the occurrence of combustion failure of the main combustor 34 to achieve stable combustion, and it is possible to suppress the supply of excess fuel to the pilot combustor 36, and it is possible to reduce the fuel cost. In addition, even if the composition of the main fuel gas changes, it is possible to adjust the combustion amount of the pilot fuel gas to an appropriate combustion amount in consideration of the change in the composition of the main fuel gas without depending on the skill of the operator, and it is possible to safely use the boiler 100. In addition, by optimizing the combustion amount of the pilot combustor 36 with feedback control, it is possible to effectively prevent the extinguishment of the combustor device 6 in the case where the composition of the fuel changes.

[0068] In addition, by appropriately combusting the non-active gas in the boiler 100, it is possible to suppress the emission of unburned fuel components in the exhaust gas of the boiler 100 and harmful substances accompanying combustion failure to the atmosphere. In addition, by optimizing the combustion amount of the pilot combustor 36, it is possible to maximize the combustion amount of the non-active gas in the operating state. Thereby, it is possible to alleviate environmental degradation caused by the emission of the non-active gas to the atmosphere.

[0069] In addition, since the flow rate of the pilot fuel gas and the amount of air supplied to the pilot combustor 36 are adjusted on the basis of the concentration of CO2 contained in the main fuel gas as the non-active gas, even if the concentration of CO2 in the main fuel gas changes, it is possible to adjust the combustion amount of the pilot combustor 36 to an appropriate combustion amount in consideration of the change in the concentration of CO2. Thereby, it is possible to achieve stable combustion of the main combustor 34, and effectively suppress the case where excess fuel is supplied to the pilot combustor 36.

[0070] In addition, since the flow rate of the pilot fuel gas and the flow rate of the air are adjusted in accordance with the difference between the concentration of CO2 contained in the main fuel gas and the reference concentration, in the case where the main fuel gas whose reference concentration of CO2 is determined is used as the fuel of the main combustor 34, it is possible to achieve stable combustion of the main combustor 34, and suppress the case where excess fuel is supplied to the pilot combustor 36.

[0071] In addition, in the case where the concentration of unburned fuel components contained in the exhaust gas of the boiler 100 exceeds the threshold value, it is determined that the boiler 100 is in a combustion failure state, and the flow rate of the pilot fuel gas and the flow rate of the air are increased, and thereby it is possible to supply the pilot combustor 36 with an appropriate amount of pilot fuel gas corresponding to the combustion state of the boiler. Therefore, it is possible to achieve stable combustion of the main combustor 34, and suppress the case where excess fuel is supplied to the pilot combustor 36.

[0072] Further, in a case where the difference (X1-C) between the concentration X1 of CO2 acquired by the first analyzer 20 and the reference concentration C of each of the maps selected by the map selection section 40 exceeds the fourth threshold value, in a case where the concentration (for example, the above-mentioned concentration X2) of the unburned fuel component contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds the fifth threshold value, or in a case where the concentration (for example, the above-mentioned concentration X3) of the component generated at the time of poor combustion contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds the sixth threshold value, an alarm signal for warning the possibility of flameout is generated, whereby in a case where the main fuel gas in which the reference concentration of CO2 is determined is used as the fuel of the main burner 34, the possibility of flameout can be warned, and appropriate response is prompted.

[0073] Further, in a case where the difference (X1-C) between the concentration X1 of CO2 acquired by the first analyzer 20 and the reference concentration C of each of the maps selected by the map selection section 40 exceeds the fourth threshold value, in a case where the concentration (for example, the above-mentioned concentration X2) of the unburned fuel component contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds the fifth threshold value, or in a case where the concentration (for example, the above-mentioned concentration X3) of the component generated at the time of poor combustion contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13 acquired by the second analyzer 22 exceeds the sixth threshold value, an alarm signal for warning the possibility of flameout is generated, whereby in a case where the main fuel gas in which the reference concentration of CO2 is determined is used as the fuel of the main burner 34, the possibility of flameout can be warned, and appropriate response is prompted.

[0074] In several embodiments, the above-mentioned combustion control device 24 can also be configured to stop the supply of the main fuel gas to the main burner 34 in a case where the pilot burner 36 is stopped. Further, the "stoppage of the pilot burner 36" indicates the stoppage of combustion of the pilot burner 36, and includes both intentional stoppage by the operator and emergency stoppage based on a protection device.

[0075] A fuel containing a proportion of or more of CO2 or the like inactive gas cannot be self-ignited alone, and thus it is necessary to cause the main burner 34 and the pilot burner 36 to combust simultaneously. Therefore, in a case where the pilot burner is stopped for some reason, it is preferable to stop the main burner 34 as well as described above.

[0076] In several embodiments, for example, as Figure 7As shown, when the flow rate of fuel gas supplied to pilot burner 36 is increased based on the composition of the main fuel gas, the combustion control device 24 may also temporarily increase the flow rate of fuel supplied to pilot burner 36 to an excess flow rate relative to the flow rate for achieving optimal combustion, and then increase the flow rate of air supplied to pilot burner 36 and decrease the flow rate of fuel supplied to pilot burner.

[0077] use Figure 8 ,right Figure 7 The observation methods will be explained. For example... Figure 8 As shown, the concentration of methane at point A is determined by the intersection of the triangle formed by the point A and the upper left side of the solid line when moving from point A parallel to the dashed line to the left, and increases as one moves upward along that upper left side. The concentration of air at point A is determined by the intersection of the triangle formed by the point A and the lower right side of the solid line when moving from point A parallel to the single-dash line, and increases as one moves to the left along that base side. The concentration of CO2 at point A is determined by the intersection of the triangle formed by the point A and the upper right side of the solid line when moving from point A and the upper right side of the double-dash line, and increases as one moves downward along that upper right side.

[0078] Figure 7 This illustrates an example of combustion control based on a combustion control device, where the combustion state is determined by combining the concentrations of methane, air, and CO2 in the combustion zone of the burner unit 6. Figure 7 In this system, point P1 is located within range S1, which represents the optimal combustion state (stable combustion without excessive fuel gas consumption and without flameout). Conversely, when the concentration of CO2 in the main fuel gas increases from the combustion state at point P1 while the concentration of methane decreases, the combustion state may shift to point P2, which is within the flameout hazard range S2, where flameout is a risk. In such a case, the combustion control device 24 performs combustion control to shift the combustion state from point P3 to point P4 as follows.

[0079] The transition from point P1 to point P2 occurs, as described above, when the difference (X1-C) between the CO2 concentration X1 of the main fuel gas obtained by the first analyzer 20 and the respective reference concentration C of the selected mapping exceeds a first threshold. In this case, the combustion control device 24 temporarily increases the flow rate of fuel supplied to the pilot burner 36 relative to the flow rate for achieving optimal combustion (the flow rate for achieving the state within range S1) to an excess flow rate (e.g., the flow rate at point P3 within range S3), then increases the flow rate of air supplied to the pilot burner 36 and decreases the flow rate of pilot fuel gas supplied to the pilot burner 36 to the flow rate for achieving optimal combustion (e.g., the flow rate at point P4 within range S1).

[0080] According to the inventor's insight, when the flow rate of the pilot fuel gas and the flow rate of air are simultaneously changed from a combustion state in which the possibility of flameout exists, the combustion state becomes unstable and flameout can occur. In contrast, in the above-described combustion control method, when the flow rate of the pilot fuel gas is increased from a combustion state in which the possibility of flameout exists, the flow rate of air is increased and the flow rate of fuel supplied to the pilot burner 36 is decreased after the flow rate of the pilot fuel gas is temporarily increased to an excessive flow rate with respect to the flow rate at which the optimum combustion state is achieved while maintaining the flow rate of air, whereby the flow rate of the pilot fuel gas can be controlled to the flow rate at which the optimum combustion state is achieved. Thus, in the process of adjusting the flow rate of fuel and the flow rate of air of the pilot burner in order to shift from a combustion state in which the possibility of flameout exists to an optimum combustion state, the destabilization of the combustion state and the occurrence of flameout can be suppressed.

[0081] In several embodiments, Figure 1 The first analyzer 20 of the combustor system 4 shown in FIG. 1 can also be a gas calorimeter configured to acquire the heat generation amount of the main fuel gas instead of acquiring information related to the composition of the main fuel gas. Hereinafter, the case in which the first analyzer 20 is a gas calorimeter will be described. Figure 9 The combustion control procedure of the combustion control device 24 based on this case will be described.

[0082] The map selection section 40 selects a map corresponding to the heat generation amount of the main fuel gas acquired by the first analyzer 20 from among a plurality of maps stored in the storage section 42, which represent the relationship between the load of the boiler 100 and the flow rate of the pilot fuel gas for each of the ranges of the heat generation amount of the main fuel gas (see FIG. 4). In the example shown in FIG. 4, three maps corresponding to three ranges of the heat generation amount of the main fuel gas (high heat generation amount, medium heat generation amount, and low heat generation amount) are stored in the storage section 42, and a map corresponding to the heat generation amount of the main fuel gas acquired by the first analyzer 20 is selected from among the three maps. Figure 9 Figure 9

[0083] ​​The pilot target flow rate arithmetic unit 44 changes the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection unit 40 and the load of the boiler 100, based on the difference (Q-Y1) between the reference heat quantity Q of the selected map and the heat quantity Y1 of the main fuel gas acquired by the first analyzer 20. That is, the larger the difference (Q-Y1) between the reference heat quantity Q of the selected map by the map selection unit 40 and the heat quantity Y1 of the main fuel gas acquired by the first analyzer 20, the more the pilot target flow rate arithmetic unit 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection unit 40 and the load of the boiler 100. In some embodiments, until the difference (Q-Y1) exceeds the tenth threshold value, the pilot target flow rate arithmetic unit 44 takes the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection unit 40 and the load of the boiler 100 as the target flow rate Fpt of the pilot fuel gas, and in the case where the difference (Q-Y1) exceeds the tenth threshold value, the larger the difference (Q-Y1), the more the pilot target flow rate arithmetic unit 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas. Thus, it is possible to suppress the situation where the target flow rate Fpt is changed excessively frequently, and it is possible to stabilize the combustion state.

[0084] In addition, in the case where the concentration of at least one of the unburned fuel component and the component generated at the time of poor combustion, which are contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13, acquired by the second analyzer 22 exceeds the threshold value of the component, the pilot target flow rate arithmetic unit 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection unit 40 and the load of the boiler 100. For example, in the case where the concentration of unburned HC contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13, acquired by the second analyzer 22, exceeds the second threshold value, the pilot target flow rate arithmetic unit 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection unit 40 and the load of the boiler 100. In addition, in the case where the concentration of CO contained in the exhaust gas of the boiler 100 flowing in the exhaust line 13, acquired by the second analyzer 22, exceeds the third threshold value, the pilot target flow rate arithmetic unit 44 increases the target flow rate Fpt of the pilot fuel gas with respect to the flow rate Fp0 of the pilot fuel gas determined in accordance with the map selected by the map selection unit 40 and the load of the boiler 100.

[0085] The structures of the PID control unit 46, the main target flow rate arithmetic unit 48, and the PID control unit 50 are the same as those described above, and thus the description thereof is omitted. Figure 5 The structures of the PID control unit 46, the main target flow rate arithmetic unit 48, and the PID control unit 50 are the same as those described above, and thus the description thereof is omitted.

[0086] In a case where the difference (Q-Y1) between the reference heat quantity Q of each of the maps selected by the map selection section 40 and the heat quantity Y1 of the main fuel gas acquired by the first analyzer 20 exceeds an eleventh threshold value, the alarm signal generation section 52 generates an alarm signal for warning the possibility of misfire occurrence. Further, the eleventh threshold value is a value larger than the tenth threshold value. The alarm signal can be a signal for causing a display or the like not shown to display a warning, can be a signal for causing an alarm or the like to operate, or can be a signal for causing other warning means to operate.

[0087] In a case where the difference (Q-Y1) between the reference heat quantity Q of each of the maps selected by the map selection section 40 and the heat quantity Y1 of the main fuel gas acquired by the first analyzer 20 exceeds a twelfth threshold value, the boiler stop signal generation section 54 generates a boiler stop signal for stopping the operation of the boiler 100. The twelfth threshold value is a value larger than the eleventh threshold value. The boiler stop signal is transmitted to each device related to the operation of the boiler 100 to stop the operation of the boiler 100.

[0088] According to the above-described combustor system 4, the flow rate of the fuel gas and the flow rate of the air supplied to the pilot combustor 36 are automatically adjusted on the basis of the heat quantity of the main fuel gas acquired by the first analyzer 20, so that the combustion quantity of the pilot combustor 36 is adjusted. Thereby, it is possible to suppress the occurrence of combustion failure of the main combustor 34 to achieve stable combustion, and it is possible to suppress the supply of excess fuel to the pilot combustor 36. In addition, even if the heat quantity of the main fuel gas changes, it is possible to adjust the combustion quantity of the pilot fuel gas to an appropriate combustion quantity in consideration of the change in the heat quantity of the main fuel gas without depending on the skill of an operator, and it is possible to safely use the boiler 100.

[0089] In addition, since the flow rate of the pilot fuel gas is adjusted on the basis of the difference between the reference heat quantity of the main fuel gas and the heat quantity of the main fuel gas acquired by the first analyzer 20, in a case where the main fuel gas of which the reference heat quantity is known in advance is used as the fuel of the main combustor, it is possible to effectively achieve stable combustion of the main combustor 34 and suppress the supply of excess fuel to the pilot combustor 36.

[0090] In addition, in a case where the concentration of at least one of the unburned fuel component contained in the exhaust gas of the boiler 100 and the component generated at the time of combustion failure exceeds the threshold value of each of the components, it is determined that the boiler 100 is in a combustion failure state and the flow rate of the pilot fuel gas is increased, whereby it is possible to supply the pilot combustor 36 with an appropriate amount of pilot fuel gas corresponding to the combustion state of the boiler 100. Therefore, it is possible to achieve stable combustion of the main combustor 34 and suppress the supply of excess fuel to the pilot combustor 36.

[0091] Further, in a case where the difference (Q-Y1) between the reference heat quantity Q of each of the maps selected by the map selection section 40 and the heat quantity Y1 of the main fuel gas acquired by the first analyzer 20 exceeds the eleventh threshold value, an alarm signal for warning of the possibility of misfire is generated, whereby in a case where the main fuel gas of which the reference heat quantity is known is used as the fuel of the main burner, the possibility of misfire can be warned and appropriate response can be prompted.

[0092] Further, in a case where the difference (Q-Y1) between the reference heat quantity Q of each of the maps selected by the map selection section 40 and the heat quantity Y1 of the main fuel gas acquired by the first analyzer 20 exceeds the twelfth threshold value, a boiler stop signal for stopping the operation of the boiler 100 is generated, whereby in a case where the main fuel gas of which the reference heat quantity is known is used as the fuel of the main burner, the boiler 100 can be prevented from suffering a safety failure or the like.

[0093] In several embodiments, Figure 9 The burner system 4 illustrated can also increase the flow rate of the pilot fuel gas supplied to the pilot burner 36 until the flow rate of the pilot fuel gas supplied to the pilot burner 36 reaches the flow rate for achieving the optimum combustion, based on the heat quantity of the main fuel gas, in the same manner as the manner explained above, after the flow rate of the pilot fuel gas supplied to the pilot burner 36 is increased to the excessive flow rate with respect to the flow rate for achieving the optimum combustion. Figure 8 The burner system 4 illustrated can also increase the flow rate of the pilot fuel gas supplied to the pilot burner 36 until the flow rate of the pilot fuel gas supplied to the pilot burner 36 reaches the flow rate for achieving the optimum combustion, based on the heat quantity of the main fuel gas, in the same manner as the manner explained above, after the flow rate of the pilot fuel gas supplied to the pilot burner 36 is increased to the excessive flow rate with respect to the flow rate for achieving the optimum combustion.

[0094] Thus, in the process of adjusting the flow rates of the fuel and the air of the pilot burner 36 for shifting from the combustion state in which the possibility of misfire exists to the optimum combustion state, the destabilization of the combustion state and the occurrence of misfire can be suppressed.

[0095] The present application is not limited to the embodiments explained above, but also includes embodiments in which the embodiments explained above are modified, and embodiments obtained by appropriately combining these embodiments.

[0096] For example, in the embodiments explained above, CO2 is exemplified as an example of the non-active gas, but the non-active gas is not limited to CO2, but can be another gas having low reactivity such as N2, Ar, helium, and the like. Further, the main fuel gas can contain a plurality of kinds of non-active gas. In this case, each threshold value related to the concentration of the non-active gas explained above can be set separately for each kind of non-active gas.

[0097] Further, in the above-described embodiments, the second analyzer 22 detects the concentration of unburned fuel components in the exhaust gas and the concentration of components generated at the time of poor combustion, but it is also possible to not detect the concentration of unburned fuel components in the exhaust gas and to detect only the concentration of unburned fuel components, or to not detect the concentration of components generated at the time of poor combustion in the exhaust gas and to detect only the concentration of unburned fuel components in the exhaust gas. The flow rate adjusting device 60 adjusts the flow rate of the pilot fuel gas supplied to the pilot burner 36 in accordance with the concentration of at least one of the unburned fuel components and the components generated at the time of poor combustion in the exhaust gas.

[0098] The content described in each of the above-described embodiments is grasped, for example, as follows.

[0099] (1) The combustor system (for example, the above-described combustor system 4) of at least one embodiment of the present application includes:

[0100] a main combustor (for example, the above-described main combustor 34) that is supplied with a first fuel gas (for example, the above-described main fuel gas) containing a non-active gas (for example, CO2, N2, Ar, or the like);

[0101] a pilot combustor (for example, the above-described pilot combustor 36) that is used to stabilize a flame of the main combustor;

[0102] a first analysis section that is configured to analyze the first fuel gas supplied to the main combustor and acquire information (for example, the concentration of the non-active gas or the calorific value of the first fuel gas) related to the components of the first fuel gas; and

[0103] a flow rate adjusting device (for example, the above-described flow rate adjusting device 60) that is configured to adjust the flow rates of a second fuel gas (for example, the above-described pilot fuel gas) and air supplied to the pilot combustor on the basis of the information related to the components of the first fuel gas acquired by the first analysis section.

[0104] According to the combustor system described in (1) above, the flow rates of the second fuel gas and air supplied to the pilot combustor are automatically adjusted on the basis of the information related to the components of the first fuel gas acquired by the first analysis section, thereby adjusting the combustion amount of the pilot combustor. Thus, it is possible to suppress the occurrence of poor combustion of the main combustor and achieve stable combustion, and it is possible to suppress the supply of excess fuel to the pilot combustor. Therefore, even if the composition of the first fuel gas changes, it is possible to adjust the combustion amount of the second fuel gas to an appropriate combustion amount in consideration of the change in the composition of the first fuel gas without depending on the skill of an operator, and it is possible to safely use the boiler.

[0105] (2) In several embodiments, in the combustor system described in the above (1),

[0106] The flow rate adjusting device is configured to, in a case where the flow rate of the second fuel gas supplied to the pilot combustor is increased based on the information related to the composition of the first fuel gas, increase the flow rate of the second fuel gas to an excessive flow rate (e.g., a flow rate within the range S2 described above) from a flow rate (e.g., a flow rate within the range S1 described above) at which the optimal combustion is achieved, and then increase the flow rate of the air supplied to the pilot combustor and decrease the flow rate of the second fuel gas.

[0107] According to the inventor's insight, when the flow rates of the second fuel gas and the air are simultaneously changed from a combustion state in which the possibility of extinction exists, the combustion state becomes unstable and the extinction can occur. In contrast, in the combustor system described in the above (2), when the flow rate of the second fuel gas supplied to the pilot combustor is increased based on the information related to the composition of the first fuel gas, the flow rate of the second fuel gas is temporarily increased to an excessive flow rate after the flow rate of the second fuel gas is increased to a flow rate at which the optimal combustion state is achieved, and then the flow rate of the air supplied to the pilot combustor is increased and the flow rate of the second fuel gas is decreased, whereby the flow rate of the second fuel gas is controlled to a flow rate at which the optimal combustion state is achieved. Thus, in the process of adjusting the flow rates of the second fuel and the air supplied to the pilot combustor in order to shift from a combustion state in which the possibility of extinction exists to an optimal combustion state, the destabilization of the combustion state and the occurrence of the extinction can be suppressed.

[0108] (3) In several embodiments, in the combustor system described in the above (1) or (2),

[0109] The first analysis section is configured to acquire the concentration of the non-active gas as the information related to the composition of the first fuel gas,

[0110] The flow rate adjusting device is configured to adjust the flow rate of the second fuel gas supplied to the pilot combustor based on the concentration of the non-active gas acquired by the first analysis section.

[0111] According to the combustor system described in the above (3), since the flow rate of the second fuel gas supplied to the pilot combustor is adjusted based on the concentration of the non-active gas contained in the first fuel gas, even if the concentration of the non-active gas of the first fuel gas changes, the flow rate of the second fuel gas can be adjusted to an appropriate flow rate in consideration of the change in the concentration of the non-active gas. Thus, stable combustion of the main combustor can be achieved, and the supply of excessive fuel to the pilot combustor can be effectively suppressed.

[0112] (4) In some embodiments, in the combustor system described in the above (3),

[0113] The flow rate adjustment device is configured to adjust the flow rate of the second fuel gas supplied to the pilot combustor in accordance with a difference between the concentration of the non-active gas acquired by the first analysis section and a reference concentration (e.g., the above-described difference (X1-C)).

[0114] According to the combustor system described in the above (4), since the flow rate of the pilot fuel gas is adjusted in accordance with a difference between the concentration of CO2 contained in the main fuel gas and a reference concentration, stable combustion of the main combustor can be achieved in a case where the first fuel gas in which the reference concentration of CO2 is determined is used as the fuel of the main combustor, and the supply of excess fuel gas to the pilot combustor is suppressed.

[0115] (5) In some embodiments, in the combustor system described in the above (4),

[0116] The flow rate adjustment device is configured to generate an alarm signal or a boiler signal for stopping the operation of the boiler in a case where a difference between the concentration of the non-active gas acquired by the first analysis section and a reference concentration exceeds a threshold value (e.g., the above-described fourth threshold value or seventh threshold value).

[0117] According to the combustor system described in the above (5), in a case where an alarm signal is generated, appropriate countermeasures can be urged based on the alarm signal, and in a case where a boiler stop signal is generated, a safety malfunction of the boiler or the like can be avoided.

[0118] (6) In some embodiments, in the combustor system described in the above (1) or (2),

[0119] The first analysis section is configured to acquire the calorific value of the first fuel gas as information related to the components of the first fuel gas,

[0120] The flow rate adjustment device is configured to adjust the flow rate of the second fuel gas supplied to the pilot combustor based on the calorific value of the first fuel gas acquired by the first analysis section.

[0121] According to the combustor system described in the above (6), since the flow rate of the second fuel gas supplied to the pilot combustor is adjusted based on the calorific value of the first fuel gas, even if the calorific value of the first fuel gas changes, the flow rate of the second fuel gas can be adjusted to an appropriate flow rate taking into account the change in the calorific value. Thus, stable combustion of the main combustor can be achieved, and the supply of excess fuel to the pilot combustor can be effectively suppressed.

[0122] (7) In some embodiments, in the combustor system described in the above (6),

[0123] The flow rate adjustment device is configured to adjust the flow rate of the second fuel gas supplied to the pilot combustor in accordance with a difference between the reference heat generation amount of the first fuel gas and the heat generation amount of the first fuel gas acquired by the first analysis section (e.g., the above difference (Q-Y1)).

[0124] According to the combustor system described in the above (7), since the flow rate of the second fuel gas is adjusted in accordance with a difference between the reference heat generation amount of the first fuel gas and the heat generation amount of the first fuel gas acquired by the first analysis section, stable combustion of the main combustor can be achieved in a case where the first fuel gas whose reference heat generation amount is determined is used as fuel of the main combustor, and supply of excess fuel gas to the pilot combustor can be suppressed.

[0125] (8) In some embodiments, in the combustor system described in the above (7),

[0126] The flow rate adjustment device is configured to generate an alarm signal or a boiler stop signal for stopping operation of the boiler in a case where the difference between the reference heat generation amount of the first fuel gas and the heat generation amount of the first fuel gas acquired by the first analysis section exceeds a threshold value (e.g., the above eleventh threshold value or twelfth threshold value).

[0127] According to the combustor system described in the above (8), in a case where the alarm signal is generated, appropriate countermeasures can be urged based on the alarm signal, and in a case where the boiler stop signal is generated, a safety malfunction of the boiler or the like can be avoided.

[0128] (9) In some embodiments, in the combustor system described in the above (1) or (2),

[0129] a second analysis section configured to analyze exhaust gas of the boiler and detect a concentration of at least one of unburned fuel components and components generated at the time of poor combustion in the exhaust gas,

[0130] The flow rate adjustment device is configured to adjust the flow rate of the second fuel gas supplied to the pilot combustor in accordance with the concentration of the at least one detected by the second analysis section.

[0131] According to the combustor system described in (9) above, since the flow rate of the second fuel gas supplied to the pilot combustor is adjusted based on at least one of the concentration of the unburned fuel component in the exhaust gas and the component generated at the time of poor combustion, even if the combustion state of the boiler changes, the flow rate of the second fuel gas can be adjusted to an appropriate flow rate in consideration of a change in at least one of the concentration of the unburned fuel component in the exhaust gas and the component generated at the time of poor combustion. Thus, stable combustion of the main combustor can be achieved, and the supply of excess fuel to the pilot combustor can be effectively suppressed.

[0132] (10) In some embodiments, in the combustor system described in (9) above,

[0133] The flow rate adjustment device is configured to increase the flow rate of the second fuel gas supplied to the pilot combustor when the concentration of at least one of the components detected by the second analysis section exceeds a threshold value for each of the components (for example, the second threshold value or the third threshold value described above).

[0134] According to the combustor system described in (10) above, when the concentration of at least one of the unburned fuel component contained in the exhaust gas of the boiler and the component generated at the time of poor combustion exceeds a threshold value for each of the components, it is determined that the boiler is in a poor combustion state, and the flow rate of the second fuel gas supplied to the pilot combustor is increased. Thus, the pilot combustor can be supplied with an appropriate amount of second fuel gas corresponding to the combustion state of the boiler. Therefore, stable combustion of the main combustor can be achieved, and the supply of excess fuel to the pilot combustor can be suppressed.

[0135] (11) In some embodiments, in the combustor system described in (10) above,

[0136] The flow rate adjustment device is configured to generate an alarm signal or a boiler stop signal for stopping the operation of the boiler when the concentration of at least one of the components obtained by the second analysis section exceeds a threshold value greater than the threshold value for each of the components (for example, the fifth threshold value, the sixth threshold value, the eighth threshold value, or the ninth threshold value described above).

[0137] According to the combustor system described in (11) above, in the case where an alarm signal is generated, an appropriate response can be prompted based on the alarm signal, and in the case where a boiler stop signal is generated, a safety malfunction or the like of the boiler can be avoided.

[0138] (12) In some embodiments, in the combustor system described in any one of (1) to (11) above,

[0139] The flow rate adjustment device is configured to stop the supply of the first fuel gas to the main combustor when the pilot combustor is stopped.

[0140] According to the combustor system described in the above (12), since the non-active gas itself cannot self-ignite, it is necessary to cause the main combustor and the pilot combustor to simultaneously combust. Therefore, in a case where the pilot combustor is caused to be extinguished due to a certain cause, it is preferable to stop the supply of the first fuel gas to the main combustor as described in the above (12).

[0141] (13) A combustion control method of a combustor system (for example, the combustor system 4 described above) of at least one embodiment of the present application,

[0142] The combustor system includes:

[0143] a main combustor (for example, the main combustor 34 described above) that is supplied with a first fuel gas (for example, the main fuel gas described above) containing a non-active gas (for example, CO2or N2described above); and

[0144] a pilot combustor (for example, the pilot combustor 36 described above) that is used to stabilize a flame of the main combustor,

[0145] The combustion control method of the combustor system includes:

[0146] an analysis step of analyzing the first fuel gas supplied to the main combustor and acquiring information (for example, the concentration of the non-active gas or the heat generation amount of the first fuel gas described above) related to the composition of the first fuel gas; and

[0147] a flow rate adjustment step of adjusting the flow rates of a second fuel gas (for example, the pilot fuel gas described above) and air supplied to the pilot combustor on the basis of the information related to the composition of the first fuel gas acquired by the analysis step.

[0148] According to the combustor system described in the above (13), the flow rates of the second fuel gas and air supplied to the pilot combustor are automatically adjusted on the basis of the information related to the composition of the first fuel gas acquired by the analysis step, so that the combustion amount of the pilot combustor is adjusted. Thereby, it is possible to suppress the occurrence of combustion failure of the main combustor to achieve stable combustion, and it is possible to suppress the supply of excess fuel to the pilot combustor. Therefore, even if the composition of the first fuel gas changes, it is possible to adjust the combustion amount of the second fuel gas to an appropriate combustion amount without depending on the skill of an operator, considering the change in the composition of the first fuel gas, and it is possible to safely use the boiler.

[0149] Explanation of symbols

[0150] 2 fire

[0151] 4 combustor system

[0152] 6 burner device

[0153] 8 main fuel line

[0154] 10 air line

[0155] 12 pilot fuel line

[0156] 13 exhaust line

[0157] 14 flow control valve

[0158] 15 flow meter

[0159] 16 fan

[0160] 18 flow control valve

[0161] 19 flow meter

[0162] 20 first analyzer

[0163] 22 second analyzer

[0164] 24 combustion control device

[0165] 26 blast gate

[0166] 28 main gas nozzle

[0167] 29 air flow path

[0168] 30 pilot gas nozzle

[0169] 31 air flow path

[0170] 32 swirler

[0171] 34 main burner

[0172] 36 pilot burner

[0173] 40 map selection section

[0174] 42 storage section

[0175] 44 pilot target flow amount calculation section

[0176] 46 PID control section

[0177] 48 main target flow amount calculation section

[0178] 50 PID control section

[0179] 52 alarm signal generation section

[0180] 54 boiler stop signal generation section

[0181] 60 flow rate adjusting device

[0182] 72 processor

[0183] 74 RAM

[0184] 76 ROM

[0185] 78 HDD

[0186] 80 input I / F

[0187] 82 output I / F

[0188] 84 bus

[0189] 100 boiler

Claims

1. A burner system, characterized by Possessing: a main burner that is supplied with a first fuel gas containing a non-active gas; a pilot burner for stabilizing a flame of the main burner; a first analysis section configured to analyze the first fuel gas supplied to the main burner and acquire information related to a component of the first fuel gas; and a flow rate adjustment device configured to adjust flow rates of a second fuel gas and air supplied to the pilot burner based on the information related to the component of the first fuel gas acquired by the first analysis section, the flow rate adjustment device being configured to, in a case where the flow rate of the second fuel gas supplied to the pilot burner is increased based on the information related to the component of the first fuel gas, increase the flow rate of the air supplied to the pilot burner and decrease the flow rate of the second fuel gas after the flow rate of the second fuel gas is increased to an excess flow rate with respect to a flow rate at which optimal combustion is achieved.

2. A burner system characterized by, Possessing: a main burner that is supplied with a first fuel gas containing a non-active gas; a pilot burner for stabilizing a flame of the main burner; a first analysis section configured to analyze the first fuel gas supplied to the main burner and acquire information related to a component of the first fuel gas; and a flow rate adjustment device configured to adjust flow rates of a second fuel gas and air supplied to the pilot burner based on the information related to the component of the first fuel gas acquired by the first analysis section, the first analysis section being configured to acquire a concentration of the non-active gas as the information related to the component of the first fuel gas, the flow rate adjustment device being configured to adjust the flow rate of the second fuel gas supplied to the pilot burner in accordance with a difference between the concentration of the non-active gas acquired by the first analysis section and a reference concentration.

3. The burner system according to claim 2, wherein the flow rate adjustment device is configured to generate an alarm signal or a boiler signal for stopping operation of a boiler in a case where the difference between the concentration of the non-active gas acquired by the first analysis section and a reference concentration exceeds a threshold value.

4. A burner system characterized by, Possessing: a main burner that is supplied with a first fuel gas containing a non-active gas; a pilot burner for stabilizing a flame of the main burner; a first analysis section configured to analyze the first fuel gas supplied to the main burner and acquire information related to a component of the first fuel gas; and a flow rate adjustment device configured to adjust flow rates of a second fuel gas and air supplied to the pilot burner based on the information related to the component of the first fuel gas acquired by the first analysis section, the first analysis section being configured to acquire a calorific value of the first fuel gas as the information related to the component of the first fuel gas, the flow rate adjustment device being configured to adjust the flow rate of the second fuel gas supplied to the pilot burner in accordance with a difference between the calorific value of the first fuel gas acquired by the first analysis section and a reference calorific value. The flow rate adjustment device is configured to adjust the flow rate of the second fuel gas supplied to the pilot burner based on a difference between a reference heat quantity of the first fuel gas and a heat quantity of the first fuel gas acquired by the first analysis section.

5. The burner system according to claim 4, wherein The flow rate adjustment device is configured to generate an alarm signal or a boiler stop signal for stopping operation of the boiler in a case where the difference between the reference heat quantity of the first fuel gas and the heat quantity of the first fuel gas acquired by the first analysis section exceeds a threshold value.

6. A burner system characterized by, provided with: a main burner supplied with a first fuel gas containing a non-active gas; a pilot burner for stabilizing a flame of the main burner; a first analysis section configured to analyze the first fuel gas supplied to the main burner and acquire information related to a component of the first fuel gas; and a flow rate adjustment device configured to adjust flow rates of a second fuel gas and air supplied to the pilot burner based on the information related to the component of the first fuel gas acquired by the first analysis section, further provided with a second analysis section configured to analyze exhaust gas of a boiler and detect a concentration of at least one of an unburned fuel component and a component generated at the time of poor combustion in the exhaust gas, the flow rate adjustment device is configured to increase the flow rate of the second fuel gas supplied to the pilot burner in a case where the concentration of the at least one detected by the second analysis section exceeds a threshold value of each of the components.

7. The burner system according to claim 6, wherein the flow rate adjustment device is configured to generate an alarm signal or a boiler stop signal for stopping operation of the boiler in a case where the concentration of the at least one acquired by the second analysis section exceeds a threshold value larger than the threshold value of each of the components.

8. The burner system according to any one of claims 1 to 7, wherein the flow rate adjustment device is configured to stop supply of the first fuel gas to the main burner in a case where the pilot burner is stopped.

9. A combustion control method of a burner system provided with: a main burner supplied with a first fuel gas containing a non-active gas; and a pilot burner for stabilizing a flame of the main burner, the method comprising: an analysis step of analyzing the first fuel gas supplied to the main burner and acquiring information related to a component of the first fuel gas; and characterized in that a flow rate adjustment step of adjusting flow rates of a second fuel gas and air supplied to the pilot burner based on the information related to the component of the first fuel gas acquired by the analysis step. ​ ​ In the flow rate adjustment step, in a case where the flow rate of the second fuel gas supplied to the pilot burner is increased based on the information related to the composition of the first fuel gas, after the flow rate of the second fuel gas is increased to an excessive flow rate with respect to a flow rate at which optimal combustion is achieved, the flow rate of air supplied to the pilot burner is increased and the flow rate of the second fuel gas is decreased.

10. A combustion control method of a combustor system, the combustor system includes: a main combustor supplied with a first fuel gas containing a non-active gas; and a pilot combustor for stabilizing a flame of the main combustor, characterized in that includes: an analysis step of analyzing the first fuel gas supplied to the main combustor and acquiring information related to a composition of the first fuel gas; and a flow rate adjustment step of adjusting flow rates of a second fuel gas and air supplied to the pilot combustor based on the information related to the composition of the first fuel gas acquired by the analysis step, in the analysis step, a concentration of the non-active gas is acquired as the information related to the composition of the first fuel gas, in the flow rate adjustment step, the flow rate of the second fuel gas supplied to the pilot combustor is adjusted based on a difference between the concentration of the non-active gas acquired by the analysis step and a reference concentration.

11. A combustion control method of a combustor system, the combustor system includes: a main combustor supplied with a first fuel gas containing a non-active gas; and a pilot combustor for stabilizing a flame of the main combustor, characterized in that includes: an analysis step of analyzing the first fuel gas supplied to the main combustor and acquiring information related to a composition of the first fuel gas; and a flow rate adjustment step of adjusting flow rates of a second fuel gas and air supplied to the pilot combustor based on the information related to the composition of the first fuel gas acquired by the analysis step, in the analysis step, a calorific value of the first fuel gas is acquired as the information related to the composition of the first fuel gas, in the flow rate adjustment step, the flow rate of the second fuel gas supplied to the pilot combustor is adjusted according to a difference between a reference calorific value of the first fuel gas and the calorific value of the first fuel gas acquired by the analysis step.

12. A combustion control method of a combustor system, the combustor system includes: a main combustor supplied with a first fuel gas containing a non-active gas; and a pilot combustor for stabilizing a flame of the main combustor, characterized in that includes: an analysis step of analyzing the first fuel gas supplied to the main combustor and acquiring information related to a composition of the first fuel gas; and a flow rate adjustment step of adjusting flow rates of a second fuel gas and air supplied to the pilot combustor based on the information related to the composition of the first fuel gas acquired by the analysis step, in the analysis step, a calorific value of the first fuel gas is acquired as the information related to the composition of the first fuel gas, in the flow rate adjustment step, the flow rate of the second fuel gas supplied to the pilot combustor is adjusted according to a difference between a reference calorific value of the first fuel gas and the calorific value of the first fuel gas acquired by the analysis step. The second analysis step analyzes exhaust gas of the boiler and detects a concentration of at least one of unburned fuel components and components generated at the time of poor combustion in the exhaust gas, In the flow rate adjustment step, the flow rate of the second fuel gas supplied to the pilot burner is increased when the concentration of at least one detected by the second analysis step exceeds a threshold value for each component.

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