Burner system and combustion control method thereof

Abstract

To provide a burner system that can suppress supply of excessive fuel to a pilot burner while promoting stable combustion of a main burner in the burner system that has the main burner using fuel containing inactive gas and the pilot burner.SOLUTION: A burner system has a main burner to which fuel gas containing inactive gas is supplied and a pilot burner for holding flames of the main burner. The burner system includes: a first analysis section configured to analyze the fuel gas supplied to the main burner and acquire information on a constituent of the fuel gas; and a flow control device configured to control flow rates of the fuel gas to be supplied to the pilot burner and air on the basis of the information on the constituent of the fuel gas.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a burner system and a combustion control method thereof. [Background technology]

[0002] Patent Document 1 discloses a fuel adjustment device for a boiler that includes a sensor that detects the amount of soot, nitrogen oxides, oxygen or carbon monoxide in the exhaust gas from the boiler, and an adjustment valve that adjusts the amount of fuel supplied to the burner based on the detection signal from the sensor. Patent Document 2 describes that in order to ensure stable operation of a gas turbine power generation system, the calorific value of fuel gas is measured, and heat reducing gas or heat increasing gas is added according to the calorific value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-157553 A [Patent Document 2] JP 2004-190633 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when fuel with a high content of inert gas is used as fuel for the main burner, a pilot burner may be used to maintain the flame of the main burner. In this case, if the components of the inert gas change, poor combustion or misfire may occur. As a countermeasure, it is possible to increase the combustion amount of the pilot burner, but supplying an excess of fuel is not preferable because it leads to an increase in fuel costs, etc. In addition, the configurations described in Patent Documents 1 and 2 do not include a pilot burner, and therefore do not disclose adjustment of the combustion amount of the pilot burner.

[0005] In view of the above circumstances, the present disclosure aims to provide a burner system and a control method thereof, which is provided with a main burner that uses fuel containing an inert gas and a pilot burner, and which can suppress the supply of excessive fuel to the pilot burner while ensuring stable combustion of the main burner. [Means for solving the problem]

[0006] In order to achieve the above object, a burner system according to at least one embodiment of the present disclosure comprises: a main burner to which a first fuel gas including an inert gas is supplied; a pilot burner for maintaining the flame of the main burner; a first analysis unit configured to analyze the first fuel gas supplied to the main burner to obtain information about components of the first fuel gas; a flow rate control device configured to control flow rates of a second fuel gas and air to be supplied to the pilot burner based on information on components of the first fuel gas acquired by the first analysis unit; Equipped with. In order to achieve the above object, a combustion control method for a burner system according to at least one embodiment of the present disclosure includes: a main burner to which a first fuel gas including an inert gas is supplied; a pilot burner for maintaining the flame of the main burner; A combustion control method for a burner system comprising: an analysis step of analyzing the first fuel gas supplied to the main burner to obtain information regarding components of the first fuel gas; a flow rate adjusting step of adjusting flow rates of the second fuel gas and air supplied to the pilot burner based on information about the components of the first fuel gas acquired by the analysis step; Equipped with. Effect of the Invention

[0007] According to the present disclosure, for a burner system including a main burner that uses fuel containing an inert gas and a pilot burner, a burner system and a control method thereof are provided that can suppress the supply of excessive fuel to the pilot burner while ensuring stable combustion of the main burner. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram of a boiler 100 including a burner system 4 according to an embodiment. [Diagram 2] 2 is a schematic side cross-sectional view showing an example of the configuration of a burner device 6. FIG. [Diagram 3] 3 is a schematic front view of the burner device 6 shown in FIG. 2 (as seen from inside the furnace 2). [Figure 4] FIG. 2 is a diagram showing an example of a hardware configuration of a combustion control device 24. [Diagram 5] FIG. 2 is a schematic diagram showing an example of a combustion control flow by a combustion control device 24 of the burner system 4. [Figure 6] FIG. 4 is a diagram showing an example of a map showing the relationship between the load of the boiler 100 and the flow rate of pilot fuel gas. [Figure 7] An example of combustion control by a combustion control device is shown for a combustion state determined by a combination of the methane concentration, the air concentration, and the CO2 concentration in the combustion region of the burner device 6. [Figure 8] FIG. 8 is a diagram for explaining how to view the concentrations of methane, air, and CO2 in FIG. 7. [Figure 9] 4 is a schematic diagram showing another example of the combustion control flow by the combustion control device 24 of the burner system 4. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the invention. For example, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions excluding the presence of other elements.

[0010] FIG. 1 is a schematic configuration diagram of a boiler 100 including a burner system 4 according to one embodiment. 1, the boiler 100 includes a furnace 2 and a burner system 4. The application of the boiler 100 is not particularly limited, and the boiler 100 may be, for example, a marine boiler.

[0011] 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.

[0012] First, an example of the configuration of the burner device 6 will be described with reference to Fig. 2 and Fig. 3. Fig. 2 is a schematic cross-sectional side view showing an example of the configuration of the burner device 6, and Fig. 3 is a schematic front view (as viewed from inside the furnace 2) of the burner device 6 shown in Fig. 2.

[0013] 2 and 3, the burner device 6 includes a burner body 25, a wind box 26, a pilot gas nozzle 30 arranged at the center of the burner body 25, a plurality of main gas nozzles 28 (six main gas nozzles 28 in the illustrated example) arranged around the pilot gas nozzle 30 along the pilot gas nozzle 30, and a swirler 32 arranged in an air passage 29 in the burner body 25 to form a swirling flow of air at the outlet of the burner device 6. The pilot gas nozzle 30 and the air passage 29 around the pilot gas nozzle 30 in the burner body 25 constitute a pilot burner 36, and the plurality of main gas nozzles 28 and the air passage 29 around each main gas nozzle 28 in the burner body 25 constitute a main burner 34.

[0014] Each of the main gas nozzles 28 is connected to the main fuel line 8 (see FIG. 1) and injects the main fuel gas containing an inert gas supplied from the main fuel line 8 into the furnace 2. The main fuel gas contains a hydrocarbon gas such as methane and CO2 as an inert gas. The pilot gas nozzle 30 is connected to the pilot fuel line 12 (see FIG. 1) and injects the pilot fuel gas supplied from the pilot fuel line 12 into the furnace 2. The pilot fuel gas contains a hydrocarbon gas such as methane. The proportion of the inert gas in the pilot fuel gas is less than or equal to the proportion of the inert gas in the main fuel gas. The wind box 26 is connected to the air line 10 (see FIG. 1), and the air supplied from the air line 10 to the wind box 26 is turned into a swirling flow by the swirler 32 and supplied into the furnace 2.

[0015] The main burner 34 forms a flame by injecting main fuel gas containing CO2 supplied from the main fuel line 8 from multiple main gas nozzles 28, mixing it with the swirling air flow generated by the swirler 32, and burning it. The pilot burner 36 forms a flame by injecting pilot fuel gas supplied from the pilot fuel line 12 from pilot gas nozzles 30, mixing it with the swirling air flow generated by the swirler 32, and burning it, and maintains the flame of the main burner 34.

[0016] Returning to FIG. 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 may be, for example, 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 to obtain information on the components of the main fuel gas. The first analyzer 20 obtains, as information on the components of the main fuel gas, information on the composition of the main fuel gas, for example, the concentrations of various hydrocarbons (methane, ethane, propane, etc.) contained in the main fuel gas and the concentration of CO2 contained in the main fuel gas. The first analyzer 20 may be, for example, an IR (infrared) type or a gas chromatograph.

[0017] A fan 16 is provided in the air line 10, and the amount of air supplied to the burner device 6 is adjusted by a combustion control device 24 described below, for example, by controlling the rotation speed of the fan 16 in accordance with the amount of fuel supplied to the burner device 6. The amount of air supplied to the burner device 6 may be adjusted by the opening degree of a vane (not shown) provided downstream of the fan 16, and in this case, the combustion control device 24 adjusts the opening degree of the vane in accordance with the amount of fuel supplied to the burner device 6.

[0018] 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 pilot fuel gas supplied from the pilot fuel line 12 to the pilot burner 36. The type of the flow meter 15, which is configured to measure the flow rate of the pilot fuel gas supplied to the pilot burner 36, is not particularly limited, and may be, for example, a Coriolis type flow meter, a differential pressure type flow meter, an ultrasonic type flow meter, or the like.

[0019] A second analyzer 22 is provided in the exhaust line 13. The second analyzer 22 analyzes the exhaust gas from the boiler 100 flowing through the exhaust line 13 to obtain the concentration of unburned fuel components 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 may be, for example, an IR (infrared) type or a gas chromatograph.

[0020] The combustion control device 24 is configured to control the combustion state of the burner device 6. The outputs of the flowmeter 15, the flowmeter 19, the first analyzer 20, and the second analyzer 22 are input to the combustion control device 24. 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 controlling the combustion state of the burner device 6 so as to suppress the supply of excessive fuel to the pilot burner 36 while achieving stable combustion in the main burner 34. Details of the combustion control by the combustion control device 24 will be described later.

[0021] In the above exemplary embodiment, the 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.

[0022] Fig. 4 is a diagram showing an example of a hardware configuration of the combustion control device 24. Fig. 5 is a schematic diagram showing an example of a combustion control flow by the combustion control device 24 of the burner system 4.

[0023] As shown in FIG. 4, the combustion control device 24 includes, for example, a processor 72, a RAM (Random Access Memory) 74, a ROM (Read Only Memory) 76, a HDD (Hard Disk Drive) 78, an input I / F 80, and an output I / F 82, and is configured using a computer in which these are connected to each other via a bus 84. The hardware configuration of the combustion control device 24 is not limited to the above, and may be configured by a combination of a control circuit and a storage device. The combustion control device 24 is also configured by a computer executing a program that realizes each function of the combustion control device 24. The functions of each part of the combustion control device 24 described below are realized, for example, by loading a program held in the ROM 76 into the RAM 74 and executing it with the processor 72, and by reading and writing data from and to the RAM 74 and the ROM 76.

[0024] The combustion control device 24 illustrated in FIG. 5 includes a map selection unit 40, a memory unit 42, a pilot target flow rate calculation unit 44, a PID control unit 46, a main target flow rate calculation unit 48, a PID control unit 50, an alarm signal generation unit 52, and a boiler stop signal generation unit 54.

[0025] The map selection unit 40 selects a map (see FIG. 6) corresponding to the concentration of CO2 acquired by the first analyzer 20 from among a plurality of maps showing the relationship between the load of the boiler 100 and the flow rate of the pilot fuel gas, which are stored in the memory unit 42 for each range of the concentration of CO2 contained in the main fuel gas. In the example shown in FIG. 5, three maps corresponding to three ranges (high concentration, medium concentration, and low concentration) of the concentration of CO2 contained in the main fuel gas are stored in the memory unit 42, and the map corresponding to the concentration of CO2 acquired by the first analyzer 20 is selected from the three maps.

[0026] The pilot target flow rate calculation unit 44 changes the target flow rate Fpt of the pilot fuel gas in accordance with 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 for each selected map, 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. That is, the pilot target flow rate calculation 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, as 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 for each map selected by the map selection unit 40 increases. The flow rate of the pilot fuel gas is optimized by feedforward control based on the concentration X1 of CO2. In some embodiments, the pilot target flow rate calculation unit 44 may set the flow rate Fp0 of the pilot fuel gas determined according to 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 until the difference (X1-C) exceeds a first threshold value, and when the difference (X1-C) exceeds the first threshold value, may increase the target flow rate Fpt of the pilot fuel gas relative to the flow rate Fp0 of the pilot fuel gas as the difference (X1-C) increases. This makes it possible to suppress excessively frequent changes in the target flow rate Fpt and stabilize the combustion state. The first threshold value may be set to a value corresponding to a point at which the combustion state is considered to change in a worsening direction, for example.

[0027] Furthermore, when the concentration of at least one of the unburned fuel components contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 and the components generated during poor combustion, which are acquired by the second analyzer 22, exceeds a threshold value for each component, the pilot target flow rate calculation unit 44 increases the target flow rate Fpt of the pilot fuel gas relative to the flow rate Fp0 of the pilot fuel gas determined according to the map selected by the map selection unit 40 and the load of the boiler 100. For example, when the concentration X2 of unburned HC contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13, which is acquired by the second analyzer 22, exceeds a second threshold value, the pilot target flow rate calculation unit 44 increases the target flow rate Fpt of the pilot fuel gas relative to the flow rate Fp0 of the pilot fuel gas determined according to the map selected by the map selection unit 40 and the load of the boiler 100. Here, the second threshold value is the concentration of unburned HC at which poor combustion is determined. Furthermore, when the concentration X3 of CO contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a third threshold, the pilot target flow rate calculation 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 according to the map selected by the map selection unit 40 and the load of the boiler 100. Here, the third threshold is the concentration of CO at which poor combustion is determined. The flow rate of the pilot fuel gas is optimized by feedback control based on the concentrations of unburned fuel components contained in the exhaust gas of the boiler 100 and the concentrations of components generated during poor combustion.

[0028] The PID control unit 46 adjusts the flow rate of the pilot fuel gas supplied to the pilot burner 36 by performing PID control for controlling the opening of the flow control valve 18 based on the target flow rate Fpt output from the pilot target flow rate calculation unit 44 and the flow rate of the pilot fuel gas measured by the flow meter 19.

[0029] The main target flow rate calculation unit 48 calculates the target flow rate Fmt of the main fuel gas to be supplied to the main burner 34 by subtracting the target flow rate Fpt output from the pilot target flow rate calculation unit 44, converted into heat value, from the fuel flow rate (fuel demand) determined according to the steam demand of the boiler 100.

[0030] The PID control unit 50 adjusts the flow rate of the main fuel gas supplied to the main burner 34 by performing PID control with the flow control valve 14 as the operation target, based on the target flow rate Fmt output from the main target flow rate calculation unit 48 and the flow rate of the main fuel gas measured by the flow meter 15.

[0031] The alarm signal generating unit 52 generates an alarm signal for warning of the possibility of misfire when the difference (X1-C) between the concentration X1 of CO2 acquired by the first analyzer 20 and the reference concentration C for each map selected by the map selecting unit 40 exceeds a fourth threshold. The fourth threshold is a value larger than the first threshold. The alarm signal generating unit 52 generates an alarm signal for warning of the possibility of misfire when the concentration (e.g., the above-mentioned concentration X2) of the unburned fuel component contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a fifth threshold. The fifth threshold is a value larger than the second threshold. The alarm signal generating unit 52 generates an alarm signal for warning of the possibility of misfire when the concentration (e.g., the above-mentioned concentration X3) of the component generated during poor combustion contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a sixth threshold. The sixth threshold is a value larger than the third threshold. In addition, the alarm signal may be a signal for displaying a warning on a display (not shown), a signal for activating an alarm, or a signal for activating other warning means.

[0032] The boiler stop signal generating unit 54 generates a boiler stop signal for stopping the operation of the boiler 100 when the difference (X1-C) between the concentration X1 of CO2 acquired by the first analyzer 20 and the reference concentration C for each map selected by the map selecting unit 40 exceeds a seventh threshold. The seventh threshold is a value larger than the fourth threshold. In addition, the boiler stop signal generating unit 54 generates a boiler stop signal for stopping the operation of the boiler 100 when the concentration (e.g., the above-mentioned concentration X2) of the unburned fuel component contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds an eighth threshold. The eighth threshold is a value larger than the fifth threshold. In addition, the boiler stop signal generating unit 54 generates a boiler stop signal for stopping the operation of the boiler 100 when the concentration (e.g., the above-mentioned concentration X3) of the component generated during poor combustion contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a ninth threshold. The ninth threshold value is a value greater than the sixth 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.

[0033] Here, the effects and advantages of the burner system 4 will be described. Conventionally, the combustion amount of the pilot burner was determined by a planned value (design value), and the operator checked whether or not poor combustion occurred. If poor combustion occurred, the operator manually adjusted the amount of fuel supplied to the pilot burner and the amount of air.

[0034] According to the burner system 4, the flow rate of the fuel gas and the flow rate of the air supplied to the pilot burner 36 are automatically adjusted based on the information on the composition of the main fuel gas acquired by the first analyzer 20, thereby adjusting the combustion amount of the pilot burner 36. This makes it possible to suppress the occurrence of poor combustion in the main burner 34 and achieve stable combustion while suppressing the supply of excessive fuel to the pilot burner 36, thereby reducing fuel costs. Furthermore, even if the composition of the main fuel gas changes, the combustion amount of the pilot fuel gas can be adjusted to an appropriate combustion amount taking into account the change in the composition of the main fuel gas regardless of the skill of the operator, and the boiler 100 can be used safely. Furthermore, by optimizing the combustion amount of the pilot burner 36 by feedforward control, it is possible to effectively prevent misfire of the burner device 6 when the composition of the fuel changes.

[0035] In addition, by appropriately burning the inert gas in the boiler 100, it is possible to suppress the release of unburned fuel components in the exhaust gas and harmful substances due to poor combustion into the atmosphere. In addition, by optimizing the combustion amount of the pilot burner 36, it is possible to maximize the combustion amount of the inert gas in the operating state. This makes it possible to reduce environmental deterioration caused by releasing the inert gas into the atmosphere.

[0036] In addition, since the flow rate of the pilot fuel gas and the amount of air supplied to the pilot burner 36 are adjusted based on the concentration of CO2, an inert gas contained in the main fuel gas, even if the concentration of CO2 in the main fuel gas changes, the combustion amount of the pilot burner 36 can be adjusted to an appropriate combustion amount taking into account the change in the concentration of CO2. This makes it possible to effectively prevent excessive fuel from being supplied to the pilot burner 36 while ensuring stable combustion of the main burner 34.

[0037] Furthermore, since the flow rate of the pilot fuel gas and the flow rate of the air are adjusted according to the difference between the concentration of CO2 contained in the main fuel gas and the standard concentration, when main fuel gas with a set standard concentration of CO2 is used as fuel for the main burner 34, it is possible to suppress the supply of excessive fuel to the pilot burner 36 while ensuring stable combustion of the main burner 34.

[0038] Furthermore, when the concentration of unburned fuel components contained in the exhaust gas of the boiler 100 exceeds a threshold value, it is determined that the boiler 100 is in a poor combustion state, and the flow rate of the pilot fuel gas and the flow rate of the air are increased, so that an appropriate amount of pilot fuel gas according to the combustion state of the boiler can be supplied to the pilot burner 36. Therefore, it is possible to suppress the supply of excessive fuel to the pilot burner 36 while ensuring stable combustion of the main burner 34.

[0039] In addition, when the difference (X1-C) between the CO2 concentration X1 acquired by the first analyzer 20 and the reference concentration C for each map selected by the map selection unit 40 exceeds a fourth threshold, when the concentration (e.g., the above-mentioned concentration X2) of the unburned fuel components contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a fifth threshold, or when the concentration (e.g., the above-mentioned concentration X3) of the components generated during poor combustion contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a sixth threshold, an alarm signal is generated to warn of the possibility of misfire. This makes it possible to warn of the possibility of misfire when a main fuel gas for which a reference concentration of CO2 is set is used as fuel for the main burner 34, and to prompt appropriate measures.

[0040] In addition, when the difference (X1-C) between the CO2 concentration X acquired by the first analyzer 20 and the reference concentration C for each map selected by the map selection unit 40 exceeds a seventh threshold, when the concentration (e.g., the above-mentioned concentration X2) of the unburned fuel component contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds an eighth threshold, or when the concentration (e.g., the above-mentioned concentration X3) of the component generated during poor combustion contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a ninth threshold, a boiler stop signal for stopping the operation of the boiler 100 is generated, thereby making it possible to avoid safety problems and the like occurring in the boiler 100 when the main fuel gas for which a reference concentration of CO2 is set is used as fuel for the main burner 34.

[0041] In some embodiments, the combustion control device 24 may be configured to stop the supply of main fuel gas to the main burner 34 when the pilot burner 36 is stopped. Note that "stopping of the pilot burner 36" refers to stopping the combustion of the pilot burner 36, and includes both an intentional stop by an operator and an emergency stop by a protective device.

[0042] Since fuel containing a certain percentage or more of inert gas such as CO2 cannot burn by itself, it is necessary to burn the main burner 34 and the pilot burner 36 simultaneously. For this reason, if the pilot burner trips for some reason, it is desirable to also trip the main burner 34 as described above.

[0043] In some embodiments, for example as shown in FIG. 7, when the combustion control device 24 increases the flow rate of the fuel gas supplied to the pilot burner 36 based on the composition of the main fuel gas, the flow rate of the fuel supplied to the pilot burner 36 may be temporarily increased to a flow rate that is excessive with respect to the flow rate that achieves optimal combustion, and then the flow rate of the air supplied to the pilot burner 36 may be increased and the flow rate of the fuel supplied to the pilot burner may be decreased.

[0044] How to read FIG. 7 will be explained with reference to FIG. 8. As shown in FIG. 8, the concentration of methane at a certain point A is determined by the intersection point with the upper left side of a solid triangle when moving from point A parallel to the dashed line to the left, and increases as one moves upward along the upper left side. The concentration of air at point A is determined by the intersection point with the base of a solid triangle when moving from point A parallel to the dashed line to the lower right, and increases as one moves left along the base. The concentration of CO2 at point A is determined by the intersection point with the upper right side of a solid triangle when moving from point A parallel to the dashed line to the upper right, and increases as one moves downward along the upper right side.

[0045] Fig. 7 shows an example of combustion control by a combustion control device for a combustion state determined by a combination of the methane concentration, the air concentration, and the CO2 concentration in the combustion region of the burner device 6. In Fig. 7, a certain point P1 is within a range S1 showing an optimal combustion state (a state in which stable combustion occurs without excessive consumption of fuel gas and without misfire), but when the CO2 concentration of the main fuel gas increases and the methane concentration decreases from the combustion state of point P1, the combustion state may transition to point P2 within a misfire danger range S2 where there is a risk of misfire. In such a case, the combustion control device 24 performs combustion control to transition the combustion state to point P4 via point P3 as follows.

[0046] A transition from point P1 to point P2 occurs, for example, when 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 for each selected map exceeds the first threshold value, as described above. In this case, the combustion control device 24 increases the flow rate of the fuel supplied to the pilot burner 36 to a flow rate that is temporarily excessive (for example, a flow rate that realizes point P3 in range S3) relative to the flow rate that realizes the optimal combustion state (a flow rate that realizes a state within range S1), and then increases the flow rate of the air supplied to the pilot burner 36 and reduces the flow rate of the pilot fuel gas supplied to the pilot burner 36 to a flow rate that realizes the optimal combustion state (for example, a flow rate that realizes point P4 in range S1).

[0047] According to the findings of the inventors of the present application, when the flow rate of the pilot fuel gas and the flow rate of the air are changed simultaneously from a combustion state where misfire is likely, the combustion state becomes unstable and misfire may occur. In contrast, in the above combustion control method, when the flow rate of the pilot fuel gas is increased from a combustion state where misfire is likely, the flow rate of the pilot fuel gas is temporarily increased to a flow rate that is excessive with respect to the flow rate that realizes the optimal combustion state while maintaining the flow rate of the air, and then the flow rate of the air supplied to the pilot burner 36 is increased and the flow rate of the fuel supplied to the pilot burner 36 is reduced, thereby controlling the flow rate of the pilot fuel gas to a flow rate that realizes the optimal combustion state. In this way, in the process of adjusting the flow rate of the fuel and the flow rate of the air of the pilot burner to transition from a combustion state where misfire is likely to occur to the optimal combustion state, it is possible to suppress the destabilization of the combustion state and the occurrence of misfire.

[0048] In some embodiments, the first analyzer 20 of the burner system 4 shown in Fig. 1 etc. may be a gas calorimeter configured to obtain the calorific value of the main fuel gas instead of information regarding the composition of the main fuel gas. The combustion control flow by the combustion control device 24 in this case will be described below with reference to Fig. 9.

[0049] The map selection unit 40 selects a map (see FIG. 9 ) corresponding to the calorific value of the main fuel gas acquired by the first analyzer 20 from among a plurality of maps showing the relationship between the load of the boiler 100 and the flow rate of the pilot fuel gas, which are stored in the memory unit 42 for each range of the calorific value of the main fuel gas. In the example shown in FIG. 9 , three maps corresponding to three ranges of the calorific value of the main fuel gas (high calorific value, medium calorific value, and low calorific value) are stored in the memory unit 42, and the map corresponding to the calorific value of the main fuel gas acquired by the first analyzer 20 is selected from the three maps.

[0050] The pilot target flow rate calculation unit 44 changes the target flow rate Fpt of the pilot fuel gas in accordance with a difference (Q-Y1) between a reference calorific value Q for each map selected by the map selection unit 40 and a calorific value Y1 of the main fuel gas acquired by the first analyzer 20, with respect to a 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 other words, the pilot target flow rate calculation unit 44 increases the target flow rate Fpt of the pilot fuel gas in accordance with 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 difference (Q-Y1) between the reference calorific value Q for each map selected by the map selection unit 40 and the calorific value Y1 of the main fuel gas acquired by the first analyzer 20 becomes larger. In some embodiments, the pilot target flow rate calculation unit 44 may set the pilot fuel gas flow rate Fp0 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 until the difference (Q-Y1) exceeds a tenth threshold, and when the difference (Q-Y1) exceeds the tenth threshold, may increase the target flow rate Fpt of the pilot fuel gas relative to the pilot fuel gas flow rate Fp0 as the difference (Q-Y1) increases. This makes it possible to suppress excessively frequent changes to the target flow rate Fpt and stabilize the combustion state.

[0051] Furthermore, when the concentration of at least one of the unburned fuel components contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 and the components generated during poor combustion, acquired by the second analyzer 22, exceeds a threshold value for each component, the pilot target flow rate calculation unit 44 increases the target flow rate Fpt of the pilot fuel gas relative to the flow rate Fp0 of the pilot fuel gas determined according to the map selected by the map selection unit 40 and the load of the boiler 100. For example, when the concentration of unburned HC contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13, acquired by the second analyzer 22, exceeds a second threshold value, the pilot target flow rate calculation unit 44 increases the target flow rate Fpt of the pilot fuel gas relative to the flow rate Fp0 of the pilot fuel gas determined according to the map selected by the map selection unit 40 and the load of the boiler 100. In addition, when the concentration of CO contained in the exhaust gas of the boiler 100 flowing through the exhaust line 13 acquired by the second analyzer 22 exceeds a third threshold value, the pilot target flow rate calculation unit 44 increases the target flow rate Fpt of the pilot fuel gas relative to the flow rate Fp0 of the pilot fuel gas determined according to the map selected by the map selection unit 40 and the load of the boiler 100.

[0052] The configurations of the PID control unit 46, the main target flow rate calculation unit 48, and the PID control unit 50 are similar to those described with reference to FIG. 5, and therefore will not be described.

[0053] The alarm signal generating unit 52 generates an alarm signal to warn of the possibility of misfire when the difference (Q-Y1) between the reference calorific value Q for each map selected by the map selecting unit 40 and the calorific value Y1 of the main fuel gas acquired by the first analyzer 20 exceeds an eleventh threshold. The eleventh threshold is a value larger than the tenth threshold. The alarm signal may be a signal for displaying a warning on a display (not shown) or the like, a signal for activating an alarm or the like, or a signal for activating other warning means.

[0054] The boiler stop signal generating unit 54 generates a boiler stop signal for stopping the operation of the boiler 100 when the difference (Q-Y1) between the reference calorific value Q for each map selected by the map selecting unit 40 and the calorific value Y1 of the main fuel gas acquired by the first analyzer 20 exceeds a twelfth threshold. The twelfth threshold is a value greater than the eleventh threshold. 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.

[0055] According to the burner system 4, the flow rate of the fuel gas and the flow rate of the air supplied to the pilot burner 36 are automatically adjusted based on the calorific value of the main fuel gas acquired by the first analyzer 20, thereby adjusting the combustion amount of the pilot burner 36. This makes it possible to suppress the occurrence of poor combustion in the main burner 34, achieve stable combustion, and suppress the supply of excessive fuel to the pilot burner 36. Furthermore, even if the calorific value of the main fuel gas changes, the combustion amount of the pilot fuel gas can be adjusted to an appropriate combustion amount in consideration of the change in the calorific value of the main fuel gas, regardless of the skill of the operator, and the boiler 100 can be used safely.

[0056] In addition, since the flow rate of the pilot fuel gas is adjusted according to the difference between the reference calorific value of the main fuel gas and the calorific value of the main fuel gas acquired by the first analyzer 20, when main fuel gas whose reference calorific value is known in advance is used as fuel for the main burner, it is possible to effectively achieve stable combustion of the main burner 34 while suppressing the supply of excessive fuel to the pilot burner 36.

[0057] Furthermore, when the concentration of at least one of the unburned fuel components contained in the exhaust gas of the boiler 100 and the components generated during poor combustion exceeds the threshold value for each component, it is determined that the boiler 100 is in a poor combustion state and the flow rate of the pilot fuel gas is increased, thereby making it possible to supply an appropriate amount of pilot fuel gas according to the combustion state of the boiler 100 to the pilot burner 36. Therefore, it is possible to suppress the supply of excessive fuel to the pilot burner 36 while ensuring stable combustion of the main burner 34.

[0058] Furthermore, when the difference (Q-Y1) between the standard calorific value Q for each map selected by the map selection unit 40 and the calorific value Y1 of the main fuel gas acquired by the first analyzer 20 exceeds an eleventh threshold value, an alarm signal is generated to warn of the possibility of misfire, thereby making it possible to warn of the possibility of misfire and prompt the user to take appropriate measures when main fuel gas, the standard calorific value of which is known in advance, is used as fuel for the main burner.

[0059] In addition, when the difference (Q-Y1) between the standard calorific value Q for each map selected by the map selection unit 40 and the calorific value Y1 of the main fuel gas acquired by the first analyzer 20 exceeds a 12th threshold value, a boiler stop signal is generated to stop the operation of the boiler 100, thereby making it possible to avoid safety problems, etc. occurring in the boiler 100 when the main fuel gas, whose standard calorific value is known in advance, is used as fuel for the main burner.

[0060] In some embodiments, when the burner system 4 shown in FIG. 9 increases the flow rate of pilot fuel gas supplied to the pilot burner 36 based on the heat value of the main fuel gas (for example, when the above difference (Q-Y1) exceeds the 10th threshold value), the flow rate of the pilot fuel supplied to the pilot burner 36 may be increased to a flow rate that is excessive relative to the flow rate that achieves optimal combustion, and then the flow rate of air supplied to the pilot burner 36 may be increased and the flow rate of fuel supplied to the pilot burner 36 may be decreased by a method similar to that described using FIG. 8.

[0061] This makes it possible to suppress destabilization of the combustion state and the occurrence of misfires in the process of adjusting the fuel flow rate and air flow rate of the pilot burner 36 in order to transition from a combustion state where misfire is possible to an optimal combustion state.

[0062] The present disclosure is not limited to the above-described embodiments, and includes modifications to the above-described embodiments and appropriate combinations of these modifications. For example, in the above-described embodiment, CO2 is given as an example of an inert gas, but the inert gas is not limited to CO2 and may be other gases with low reactivity, such as N2, Ar, or helium. The main fuel gas may contain multiple types of inert gas. In this case, each threshold value related to the concentration of the inert gas may be set for each type of inert gas.

[0063] In the above embodiment, the second analyzer 22 detects the concentration of unburned fuel components in the exhaust gas and the concentration of components resulting from poor combustion, but the second analyzer 22 may detect only the concentration of unburned fuel components without detecting the concentration of unburned fuel components in the exhaust gas, or may detect only the concentration of unburned fuel components in the exhaust gas without detecting the concentration of components resulting from poor combustion in the exhaust gas. The flow rate adjustment device 60 may adjust the flow rate of pilot fuel gas supplied to the pilot burner 36 according to the concentration of at least one of the unburned fuel components in the exhaust gas and the components resulting from poor combustion.

[0064] The contents described in each of the above embodiments can be understood, for example, as follows.

[0065] (1) A burner system according to at least one embodiment of the present disclosure (e.g., the burner system 4 described above) A main burner (e.g., the above-mentioned main burner 34) to which a first fuel gas (e.g., the above-mentioned main fuel gas) containing an inert gas (e.g., the above-mentioned CO2, N2, Ar, etc.) is supplied; A pilot burner (such as the above-mentioned pilot burner 36) for maintaining the flame of the main burner; a first analysis unit configured to analyze the first fuel gas supplied to the main burner and obtain information about a component of the first fuel gas (e.g., a concentration of the inert gas or a calorific value of the first fuel gas); a flow rate adjusting device (e.g., the above-mentioned flow rate adjusting device 60) configured to adjust the flow rates of a second fuel gas (e.g., the above-mentioned pilot fuel gas) and air supplied to the pilot burner based on information on the components of the first fuel gas acquired by the first analysis unit; Equipped with.

[0066] According to the burner system described in (1) above, the flow rate of the second fuel gas and the flow rate of air supplied to the pilot burner are automatically adjusted based on information on the components of the first fuel gas obtained by the first analyzer to adjust the combustion amount of the pilot burner. This makes it possible to suppress the occurrence of poor combustion in the main burner and achieve stable combustion while suppressing the supply of excessive fuel to the pilot burner. Therefore, even if the composition of the first fuel gas changes, the combustion amount of the second fuel gas can be adjusted to an appropriate combustion amount taking into account the change in the composition of the first fuel gas regardless of the skill of the operator, and the boiler can be used safely.

[0067] (2) In some embodiments, in the burner system described in (1) above, The flow control device is configured, when increasing the flow rate of the second fuel gas supplied to the pilot burner based on information about the components of the first fuel gas, to increase the flow rate of the second fuel gas to an excess flow rate (e.g., a flow rate within the above-mentioned range S2) relative to the flow rate that achieves optimal combustion (e.g., a flow rate within the above-mentioned range S1), and then to increase the flow rate of air supplied to the pilot burner and reduce the flow rate of the second fuel gas.

[0068] According to the findings of the inventors of the present application, when the flow rate of the second fuel gas and the flow rate of the air are changed simultaneously from a combustion state where misfire may occur, the combustion state may become unstable and misfire may occur. In contrast, in the burner system described in (2) above, when the flow rate of the second fuel gas supplied to the pilot burner is increased based on information on the components of the first fuel gas, the flow rate of the second fuel gas is temporarily increased to a flow rate that is excessive with respect to the flow rate that realizes the optimal combustion state, and then the flow rate of the air supplied to the pilot burner is increased and the flow rate of the second fuel is reduced, thereby controlling the flow rate of the second fuel gas to a flow rate that realizes the optimal combustion state. This makes it possible to suppress the destabilization of the combustion state and the occurrence of misfire in the process of adjusting the flow rates of the second fuel and the air supplied to the pilot burner to transition from a combustion state where misfire may occur to an optimal combustion state.

[0069] (3) In some embodiments, in the burner system described in (1) or (2) above, the first analysis unit is configured to acquire a concentration of the inert gas as information regarding a component of the first fuel gas; The flow rate adjustment device is configured to adjust a flow rate of the second fuel gas supplied to the pilot burner, based on the concentration of the inert gas acquired by the first analysis unit.

[0070] According to the burner system described in (3) above, the flow rate of the second fuel gas supplied to the pilot burner is adjusted based on the concentration of the inert gas contained in the first fuel gas, so even if the concentration of the inert gas in 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 concentration of the inert gas. This makes it possible to effectively prevent excessive fuel from being supplied to the pilot burner while ensuring stable combustion in the main burner.

[0071] (4) In some embodiments, in the burner system described in (3) above, The flow rate control device is configured to adjust the flow rate of the second fuel gas supplied to the pilot burner in accordance with the difference between the concentration of the inert gas obtained by the first analysis unit and a reference concentration (e.g., the above-mentioned difference (X1-C)).

[0072] According to the burner system described in (4) above, the flow rate of the pilot fuel gas is adjusted according to the difference between the concentration of CO2 contained in the main fuel gas and the standard concentration. Therefore, when the first fuel gas, in which the standard concentration of CO2 is set, is used as fuel for the main burner, it is possible to suppress the supply of excessive fuel gas to the pilot burner while ensuring stable combustion in the main burner.

[0073] (5) In some embodiments, in the burner system described in (4) above, The flow control device is configured to generate an alarm signal or a boiler signal to stop operation of a boiler when the difference between the concentration of the inert gas obtained by the first analysis unit and a reference concentration exceeds a threshold value (e.g., the fourth threshold value or the seventh threshold value mentioned above).

[0074] According to the burner system described in (5) above, when an alarm signal is generated, it is possible to prompt appropriate action based on the alarm signal, and when a boiler stop signal is generated, it is possible to avoid safety problems, etc. occurring in the boiler.

[0075] (6) In some embodiments, in the burner system described in (1) or (2) above, the first analysis unit is configured to acquire a calorific value of the first fuel gas as information about a component of the first fuel gas; The flow rate adjustment device is configured to adjust the flow rate of the second fuel gas supplied to the pilot burner, based on the calorific value of the first fuel gas acquired by the first analysis unit.

[0076] According to the burner system described in (6) above, the flow rate of the second fuel gas supplied to the pilot burner is adjusted based on the calorific value of the first fuel gas, so that 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. This makes it possible to effectively prevent excessive fuel from being supplied to the pilot burner while ensuring stable combustion in the main burner.

[0077] (7) In some embodiments, in the burner system described above in (6), The flow rate control device is configured to adjust the flow rate of the second fuel gas supplied to the pilot burner in accordance with a difference (for example, the above-mentioned difference (Q-Y1)) between a reference calorific value of the first fuel gas and the calorific value of the first fuel gas acquired by the first analysis unit.

[0078] According to the burner system described in (7) above, the flow rate of the second fuel gas is adjusted according to the difference between the standard calorific value of the first fuel gas and the calorific value of the first fuel gas acquired by the first analysis unit. Therefore, when the first fuel gas, the standard calorific value of which is set, is used as fuel for the main burner, it is possible to suppress the supply of excessive fuel gas to the pilot burner while ensuring stable combustion in the main burner.

[0079] (8) In some embodiments, in the burner system described in (7) above, The flow control device is configured to generate an alarm signal or a boiler stop signal to stop operation of the boiler when a difference between the reference calorific value of the first fuel gas and the calorific value of the first fuel gas acquired by the first analysis unit exceeds a threshold value (e.g., the above-mentioned 11th threshold or 12th threshold value).

[0080] According to the burner system described in (8) above, when an alarm signal is generated, it is possible to prompt appropriate action based on the alarm signal, and when a boiler stop signal is generated, it is possible to avoid safety problems, etc. occurring in the boiler.

[0081] (9) In some embodiments, in the burner system described in (1) or (2) above, A second analysis unit configured to analyze the exhaust gas of the boiler to detect the concentration of at least one of unburned fuel components and components generated during poor combustion in the exhaust gas, The flow rate adjustment device is configured to adjust the flow rate of the second fuel gas supplied to the pilot burner in accordance with the concentration of the at least one of the components detected by the second analysis unit.

[0082] According to the burner system described in (9) above, the flow rate of the second fuel gas supplied to the pilot burner is adjusted based on at least one of the concentration of unburned fuel components in the exhaust gas and the components generated during poor combustion, so that 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 the change in at least one of the concentration of unburned fuel components in the exhaust gas and the components generated during poor combustion. This makes it possible to effectively prevent excessive fuel from being supplied to the pilot burner while ensuring stable combustion in the main burner.

[0083] (10) In some embodiments, in the burner system described in (9) above, The flow rate control device is configured to increase the flow rate of the second fuel gas supplied to the pilot burner when the concentration of at least one of the components detected by the second analysis unit exceeds a threshold value for each component (e.g., the above-mentioned second threshold value or third threshold value).

[0084] According to the burner system described in (10) above, when the concentration of at least one of the unburned fuel components contained in the exhaust gas from the boiler and the components generated during poor combustion exceeds the threshold value for each component, 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 burner is increased, so that an appropriate amount of the second fuel gas according to the combustion state of the boiler can be supplied to the pilot burner. Therefore, it is possible to suppress the supply of excessive fuel to the pilot burner while ensuring stable combustion of the main burner.

[0085] (11) In some embodiments, in the burner system described in (10) above, The flow control device is configured to generate an alarm signal or a boiler stop signal to stop operation of the boiler when the concentration of at least one of the components obtained by the second analysis unit exceeds another threshold value (e.g., the above-mentioned fifth threshold, sixth threshold, eighth threshold or ninth threshold) that is greater than the threshold value for each component.

[0086] According to the burner system described in (11) above, when an alarm signal is generated, it is possible to prompt appropriate action based on the alarm signal, and when a boiler stop signal is generated, it is possible to avoid safety problems, etc. occurring in the boiler.

[0087] (12) In some embodiments, in the burner system according to any one of (1) to (11) above, The flow rate adjusting device is configured to stop the supply of the first fuel gas to the main burner when the pilot burner is stopped.

[0088] According to the burner system described in (12) above, since the inert gas cannot burn by itself, the main burner and the pilot burner need to be burned simultaneously. Therefore, if the pilot burner misfires for some reason, it is desirable to stop the supply of the first fuel gas to the main burner as described in (12) above.

[0089] (13) A method for controlling combustion in a burner system (e.g., the burner system 4 described above) according to at least one embodiment of the present disclosure, A main burner (e.g., the above-mentioned main burner 34) to which a first fuel gas (e.g., the above-mentioned main fuel gas) containing an inert gas (e.g., the above-mentioned CO2 or N2) is supplied; A pilot burner (such as the above-mentioned pilot burner 36) for maintaining the flame of the main burner; A combustion control method for a burner system comprising: an analysis step of analyzing the first fuel gas supplied to the main burner to obtain information about a component of the first fuel gas (e.g., the concentration of the inert gas or the heating value of the first fuel gas); a flow rate adjusting step of adjusting a flow rate of a second fuel gas (e.g., the above-mentioned pilot fuel gas) supplied to the pilot burner based on information about the components of the first fuel gas acquired by the analysis step; Equipped with.

[0090] According to the burner system described in (13) above, the flow rate of the second fuel gas and the flow rate of air supplied to the pilot burner are automatically adjusted based on the information on the components of the first fuel gas acquired in the analysis step, to adjust the combustion amount of the pilot burner. This makes it possible to suppress the occurrence of poor combustion in the main burner and achieve stable combustion while suppressing the supply of excessive fuel to the pilot burner. Therefore, even if the composition of the first fuel gas changes, the combustion amount of the second fuel gas can be adjusted to an appropriate combustion amount taking into account the change in the composition of the first fuel gas, regardless of the skill of the operator, and the boiler can be used safely. [Explanation of symbols]

[0091] 2 Furnace 4 Burner System 6 Burner equipment 8 Main Fuel Line 10 Air Line 12 Pilot Fuel Line 13 Exhaust line 14 Flow Control Valve 15 Flow meter 16 Fans 18 Flow Control Valve 19 Flow meter 20 1st analyzer 22 Second analyzer 24 Combustion control device 26 Wind Box 28 Main Gas Nozzle 29 Air Flow Path 30 Pilot Gas Nozzle 31 Air flow path 32 Swara 34 Main burner 36 Pilot Burner 40 Map Selection Section 42 Storage section 44 Pilot target flow rate calculation unit 46 PID control unit 48 Main target flow rate calculation section 50 PID control unit 52 Alarm signal generator 54 Boiler stop signal generator 60 Flow rate adjustment device 72 processors 74 RAM 76 ROM 78 HDD 80 Input I / F 82 Output I / F 84 Bus 100 Boiler

Claims

1. a main burner to which a first fuel gas containing an inert gas is supplied; a pilot burner for maintaining the flame of the main burner; a first analysis unit configured to analyze the first fuel gas supplied to the main burner to obtain information about components of the first fuel gas; a flow rate control device configured to control flow rates of a second fuel gas and air to be supplied to the pilot burner based on information on components of the first fuel gas acquired by the first analysis unit; and Equipped with the flow rate control device is configured to, when increasing the flow rate of the second fuel gas supplied to the pilot burner based on information on the components of the first fuel gas, increase the flow rate of the second fuel gas to a flow rate that is excessive with respect to a flow rate that realizes optimal combustion, and then increase the flow rate of air supplied to the pilot burner and reduce the flow rate of the second fuel gas. Burner system.

2. A main burner to which a first fuel gas containing an inert gas is supplied, a pilot burner for maintaining the flame of the main burner; a first analysis unit configured to analyze the first fuel gas supplied to the main burner to obtain information about components of the first fuel gas; a flow rate control device configured to control flow rates of a second fuel gas and air to be supplied to the pilot burner based on information on components of the first fuel gas acquired by the first analysis unit; and Equipped with the first analysis unit is configured to acquire a concentration of the inert gas as information regarding a component of the first fuel gas, The flow rate control device is configured to adjust a flow rate of the second fuel gas supplied to the pilot burner in accordance with a difference between the concentration of the inert gas acquired by the first analysis unit and a reference concentration. Burner system.

3. The burner system of claim 2, wherein the flow control device is configured to generate an alarm signal or a boiler signal for stopping operation of the boiler when a difference between the concentration of the inert gas acquired by the first analysis unit and a reference concentration exceeds a threshold value.

4. A main burner to which a first fuel gas containing an inert gas is supplied, a pilot burner for maintaining the flame of the main burner; a first analysis unit configured to analyze the first fuel gas supplied to the main burner to obtain information about components of the first fuel gas; a flow rate control device configured to control flow rates of a second fuel gas and air to be supplied to the pilot burner based on information on components of the first fuel gas acquired by the first analysis unit; and Equipped with the first analysis unit is configured to acquire a calorific value of the first fuel gas as information about a component of the first fuel gas, the flow rate control device is configured to adjust a flow rate of the second fuel gas supplied to the pilot burner in accordance with a difference between a reference calorific value of the first fuel gas and a calorific value of the first fuel gas acquired by the first analysis unit. Burner system.

5. 5. The burner system according to claim 4, wherein the flow rate control device is configured to generate an alarm signal or a boiler stop signal for stopping operation of the boiler when a difference between a reference calorific value of the first fuel gas and the calorific value of the first fuel gas acquired by the first analysis unit exceeds a threshold value.

6. A main burner to which a first fuel gas containing an inert gas is supplied, a pilot burner for maintaining the flame of the main burner; a first analysis unit configured to analyze the first fuel gas supplied to the main burner to obtain information about components of the first fuel gas; a flow rate control device configured to control flow rates of a second fuel gas and air to be supplied to the pilot burner based on information on components of the first fuel gas acquired by the first analysis unit; and Equipped with A second analysis unit configured to analyze exhaust gas from the boiler to detect a concentration of at least one of an unburned fuel component and a component generated during poor combustion in the exhaust gas, The flow rate control device is configured to increase a flow rate of the second fuel gas supplied to the pilot burner when the concentration of the at least one component detected by the second analysis unit exceeds a threshold value for each component. Burner system.

7. The burner system of claim 6, wherein the flow control device is configured to generate an alarm signal or a boiler shutdown signal for stopping operation of the boiler when the concentration of at least one of the components obtained by the second analysis unit exceeds another threshold value that is greater than the threshold value for each component.

8. 8. The burner system according to claim 1, wherein the flow rate control device is configured to stop the supply of the first fuel gas to the main burner when the pilot burner is stopped.

9. a main burner to which a first fuel gas containing an inert gas is supplied; a pilot burner for maintaining the flame of the main burner; A combustion control method for a burner system comprising: an analysis step of analyzing the first fuel gas supplied to the main burner to obtain information regarding components of the first fuel gas; a flow rate adjusting step of adjusting flow rates of the second fuel gas and air supplied to the pilot burner based on information about components of the first fuel gas acquired by the analysis step; Equipped with In the flow rate adjusting step, when the flow rate of the second fuel gas supplied to the pilot burner is increased based on information about the components of the first fuel gas, the flow rate of the second fuel gas is increased to a flow rate that is excessive with respect to a flow rate that realizes optimal combustion, and then the flow rate of air supplied to the pilot burner is increased and the flow rate of the second fuel gas is reduced. A method for controlling combustion in a burner system.

10. a main burner to which a first fuel gas containing an inert gas is supplied; a pilot burner for maintaining the flame of the main burner; A combustion control method for a burner system comprising: an analysis step of analyzing the first fuel gas supplied to the main burner to obtain information regarding components of the first fuel gas; a flow rate adjusting step of adjusting flow rates of the second fuel gas and air supplied to the pilot burner based on information about components of the first fuel gas acquired by the analysis step; Equipped with The analyzing step includes acquiring a concentration of the inert gas as information about the components of the first fuel gas. the flow rate adjusting step adjusts a flow rate of the second fuel gas supplied to the pilot burner in accordance with a difference between the concentration of the inert gas acquired in the analyzing step and a reference concentration. A method for controlling combustion in a burner system.

11. a main burner to which a first fuel gas containing an inert gas is supplied; a pilot burner for maintaining the flame of the main burner; A combustion control method for a burner system comprising: an analysis step of analyzing the first fuel gas supplied to the main burner to obtain information regarding components of the first fuel gas; a flow rate adjusting step of adjusting flow rates of the second fuel gas and air supplied to the pilot burner based on information about components of the first fuel gas acquired by the analysis step; Equipped with the analyzing step acquires a calorific value of the first fuel gas as information about a component of the first fuel gas; the flow rate adjusting step adjusts a flow rate of the second fuel gas supplied to the pilot burner in accordance with a difference between a reference heating value of the first fuel gas and the heating value of the first fuel gas acquired in the analyzing step. A method for controlling combustion in a burner system.

12. a main burner to which a first fuel gas containing an inert gas is supplied; a pilot burner for maintaining the flame of the main burner; A combustion control method for a burner system comprising: an analysis step of analyzing the first fuel gas supplied to the main burner to obtain information regarding components of the first fuel gas; a flow rate adjusting step of adjusting flow rates of the second fuel gas and air supplied to the pilot burner based on information about components of the first fuel gas acquired by the analysis step; Equipped with A second analysis step is configured to analyze the exhaust gas of the boiler to detect the concentration of at least one of unburned fuel components and components generated during poor combustion in the exhaust gas, the flow rate adjusting step increases a flow rate of the second fuel gas supplied to the pilot burner when the concentration of at least one of the components detected in the second analyzing step exceeds a threshold value for each component. A method for controlling combustion in a burner system.

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