JP2023149031A - heat source machine system - Google Patents

Abstract

To easily and efficiently utilize the mixed gas mainly composed of hydrocarbon and hydrogen.SOLUTION: A heat-source machine system 10A includes: a fuel-cell cell stack 20 in which the mixed gas mainly composed of hydrocarbon and hydrogen supplied from a gas conduit G is supplied to a fuel electrode 20A and the hydrogen in the mixed gas is used in the power generation reaction to generate power; a heat source machine 30 having a burner 32 which burns the fuel electrode off-gas discharged from the fuel electrode 20A of the fuel-cell cell stack 20, and a heat exchanger 34 which exchanges heat between the combustion heat by the burner 32 and the fluid to be heated; and a controller 40 which adjusts the flow rate of the mixed gas supplied by a fuel supply blower 24 so that the heat amount of the fuel electrode off-gas matches the amount of heat required by the heat source machine 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat source device system.

In order to realize a low-carbon society, consideration is being given to using a mixed gas in which hydrogen is mixed with a hydrocarbon gas whose main component is methane, such as conventional city gas. When such a mixed gas is supplied from a gas conduit, the user's response becomes a problem.

In Patent Documents 1 and 2, when hydrogen fuel equipment and existing gas combustion equipment coexist, in order to use both equipment without problems, hydrogen and hydrocarbon gas in the mixed gas are separated and used in the equipment. The separated unused gas that cannot be used is returned to the pipeline and supplied to other consumers.

Patent No. 4530193 Patent No. 4721525

When the separated gas is returned to the gas conduit as in Patent Documents 1 and 2, variations occur in the concentration of hydrogen and hydrocarbons in the returned gas, and the gas conduit system becomes large-scale. On the other hand, it is conceivable to burn the mixed gas with existing gas combustion equipment, but hydrogen cannot be used efficiently. When there are users of hydrogen fuel equipment and users of existing gas combustion equipment on the consumer side, there is a need for a method for using mixed gas simply and efficiently.

The present invention has been made in consideration of the above facts, and an object of the present invention is to easily and efficiently utilize a mixed gas containing hydrocarbons and hydrogen as main components.

In the heat source device system according to claim 1, a mixed gas containing hydrocarbons and hydrogen as main components supplied from a gas conduit is supplied to a fuel electrode by a fuel supply section, and hydrogen in the mixed gas is used for a power generation reaction. A heat source that includes a fuel cell that generates electricity, a burner that burns fuel electrode off-gas discharged from the fuel electrode of the fuel cell, and a heat exchanger that exchanges heat between the combustion heat of the burner and a fluid to be heated. and a control section that adjusts the flow rate of the mixed gas supplied by the fuel supply section so that the amount of heat of the fuel electrode off-gas matches the amount of heat required by the heat source device.

In the heat source device system according to claim 1, the mixed gas containing hydrocarbons and hydrogen as main components from the gas pipe is supplied to the fuel electrode of the fuel cell, and the hydrogen in the mixed gas is used for power generation in the fuel cell. . The fuel electrode off-gas that is discharged from the fuel electrode without being used for power generation is used for combustion in the burner of the heat source equipment, and heat is exchanged between the combustion heat from the burner and the fluid to be heated in the heat exchanger. The target fluid is heated.

According to the heat source device system according to the first aspect, hydrogen in the mixed gas is used in the fuel cell, and unused hydrocarbons are used in the heat source device. Therefore, the mixed gas can be used more efficiently than when hydrogen and hydrocarbons are burned and used only by the heat source device. Further, a separation device is not required, and the structure can be simplified.

Further, the control section adjusts the flow rate of the mixed gas supplied by the fuel supply section so that the amount of heat of the fuel electrode off-gas becomes the amount of heat required by the heat source device. Therefore, by adjusting the flow rate of the mixed gas supplied by the fuel supply section in consideration of the amount of heat consumed by power generation by the fuel cell, the amount of heat required by the heat source device can be supplied to the burner.

In the heat source device system according to claim 2, the control unit controls the fuel supply so that the amount of heat of the fuel electrode off-gas becomes the amount of heat required by the heat source device based on the required amount of heat and the power generation output of the fuel cell. The flow rate of the mixed gas supplied by the unit is adjusted.

According to the heat source device system according to claim 2, by calculating the amount of consumed hydrogen that changes depending on the power generation output of the fuel cell, the amount of heat of the fuel electrode off-gas can be easily set as the amount of heat required by the heat source device. .

In the heat source device system according to a third aspect of the present invention, the control section controls the output of the fuel cell and the fuel supply section so that the fuel cell generates a power output according to a power load of a power supply destination.

According to the heat source device system according to the third aspect, the required amount of heat can be supplied to the heat source device while reducing surplus power by making the power generation output by the fuel cell follow the load.

The heat source equipment system according to claim 4 includes a combustion air supply section that sends combustion air to the burner, and the control section controls the flow rate of the mixed gas supplied by the fuel supply section and the supply to the burner. The combustion air supply unit is controlled so that the flow rate of air supplied to the burner is adjusted based on the composition of the fuel electrode off-gas.

According to the heat source device system according to the fourth aspect, an appropriate amount of air that improves combustion efficiency can be supplied to the burner.

In the heat source device system according to a fifth aspect of the present invention, the control section controls the fuel supply section so that the mixed gas is supplied to the fuel electrode only when there is an operation request to the heat source device.

According to the heat source device system according to the fifth aspect, the control section controls the fuel supply section so that the mixed gas is supplied to the fuel cell only when there is an operation request to the heat source device. Here, "when there is an operation request for the heat source device" means a case where there is an operation request for the heat source device and the heat source device is operating in response to the request. Therefore, a situation where only the fuel cell is operated and the heat source machine is not operated does not occur, and the fuel electrode off-gas containing hydrocarbons and unused hydrogen discharged from the fuel cell can be appropriately processed in the heat source machine. . Further, there is no need to separately provide equipment for processing the fuel electrode off-gas, and there is no need for a separation device, resulting in a simple configuration.

According to the heat source device system according to the present invention, a mixed gas containing hydrocarbons and hydrogen as main components can be used easily and efficiently.

FIG. 1 is a configuration diagram of a heat source device system according to the present embodiment. FIG. 2 is a control-related configuration diagram of the heat source device system according to the present embodiment. This is an example of an air-fuel ratio table. It is a flowchart of power generation control processing. It is a flowchart of flow rate adjustment processing.

Embodiments of the present invention will be described with reference to the drawings.

The heat source device system 10A is a system for heating a fluid to be heated such as water, which is installed in a user's home or an apartment complex, and is a device that serves as a heat source for hot water supply equipment, hot water floor heating equipment, etc. . FIG. 1 schematically shows the main configuration of a heat source device system 10A according to an embodiment of the present invention. A heat source device system 10A according to an embodiment of the present invention includes a power generation unit 12 and a heat source device 30 as main components.

Mixed gas is supplied to the heat source system 10A from a gas conduit G that supplies gas to a predetermined area. The mixed gas is a gas whose main components are hydrogen and hydrocarbons, and for example, a mixture of city gas and hydrogen can be used. Further, as an example, the hydrogen concentration in the mixed gas can be set to about 0.1% to 10%, and the methane concentration can be set to about 90% to 99.9%. A fuel supply pipe P1 is provided branching off from the gas conduit G, and the mixed gas is supplied to the heat source system 10A via the fuel supply pipe P1.

The power generation unit 12 is a device that generates power using hydrogen in a mixed gas, and includes a desulfurizer 14 , a fuel cell stack 20 , an air supply blower 22 , a fuel supply blower 24 , and a power conditioner 26 .

The fuel cell stack 20 is a cell stack including a plurality of stacked fuel cells. The fuel cell stack 20 is an example of a fuel cell in the present invention, and each fuel cell includes an electrolyte layer (not shown), a fuel electrode 20A and an air electrode laminated on the front and back surfaces of the electrolyte layer, respectively. 20B. Note that various fuel cells can be used as the fuel cell stack 20, such as a solid oxide fuel cell (SOFC), a molten carbonate fuel cell (MCFC), and a polymer electrolyte fuel cell (PEFC). . This embodiment will be explained using PEFC as an example.

A fuel supply pipe P1 is connected to the inlet side of the fuel electrode 20A, and an air supply pipe P2 is connected to the inlet side of the air electrode 20B. The fuel supply pipe P1 is provided with a fuel supply blower 24 and a desulfurizer 14 in this order from the upstream side. The fuel supply blower 24 sends out the mixed gas toward the fuel electrode 20A at a specified flow rate. The desulfurizer 14 removes sulfur components as an odorant in the mixed gas. The mixed gas from which the sulfur component has been removed contains hydrogen and methane, and is supplied to the fuel electrode 20A of the fuel cell stack 20 without being reformed. The air supply pipe P2 is provided with an air supply blower 22, and the air supply blower 22 supplies air to the air electrode 20B.

A fuel electrode off-gas pipe P3 is connected to the exit side of the fuel electrode 20A, and an air electrode off-gas pipe P4 is connected to the exit side of the air electrode 20B. The downstream end of the fuel electrode off-gas pipe P3 is connected to a burner 32 of the heat source device 30, which will be described later. The air electrode off-gas discharged from the air electrode 20B is dissipated into the atmosphere from the air electrode off-gas pipe P4. The fuel electrode off-gas discharged from the fuel electrode 20A is supplied to the burner 32 via the fuel electrode off-gas pipe P3.

A power conditioner 26 is electrically connected to the fuel cell stack 20 . The power conditioner 26 controls the power generation output by the fuel cell stack 20 and supplies power to the user. The power conditioner 26 controls the power generation output according to the power load of the power supply destination (user). However, in this embodiment, load following which requires a mixed gas exceeding the required heat amount (required heat amount) of the heat source device 30 is not performed, and power generation is possible using hydrogen contained in the mixed gas with a flow rate within the required heat amount range. Output.

The heat source device 30 is a device that heats a fluid to be heated using fuel electrode off-gas discharged from the fuel electrode 20A of the fuel cell stack 20 of the power generation unit 12 as fuel, and includes a burner 32 and a heat exchanger 34. There is. Clean water is supplied to the heat exchanger 34 from a water supply pipe P5.

The burner 32 is connected to a fuel electrode off-gas pipe P3 and a combustion air supply pipe P8. The fuel electrode off-gas discharged from the fuel electrode 20A of the fuel cell stack 20 is supplied from the fuel electrode off-gas pipe P3. A combustion air supply blower 28 is provided at the upstream end of the combustion air supply pipe P8, and combustion air is supplied to the burner 32 by driving the combustion air supply blower 28. Burner 32 is located adjacent to heat exchanger 34 . The burner 32 burns the combustible components in the fuel electrode off-gas and heats the clean water supplied to the heat exchanger 34 with the heat of combustion.

The tap water heated by the heat exchanger 34 is sent out from the pipe P7 and is supplied to hot water supply and floor heating. Combustion exhaust gas from the burner 32 is discharged from the exhaust gas pipe P6.

FIG. 2 shows a schematic block diagram of the control system of the heat source device system 10A. The heat source device system 10A is provided with a controller 40, and the power generation unit 12 and the heat source device 30 are controlled by the controller 40.

As shown in FIG. 2, the controller 40 includes a CPU (Central Processing Unit) 41, a ROM (Read Only Memory) 42, a RAM (Random Access Memory) 43, and an input/output interface (I/F) 44. A storage unit 45 is provided.

The CPU 41, ROM 42, RAM 43, and I/F 44 are each connected via a bus 46. Each functional unit including the storage unit 45 is connected to the I/F 44 . Each of these functional units can communicate with the CPU 41 via the I/F 44.

As the storage unit 45, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), a flash memory, or the like is used. The storage unit 45 stores a control program for controlling each part of the heat source device system 10A and various data. Note that this control program and various data may be stored in the ROM 42.

In this embodiment, a power generation control processing program and the like are stored as part of the control program. Further, as data used in this process, power generation condition information J, a table T1 corresponding to the required amount of mixed gas, an air-fuel ratio table T2, etc. are stored.

The power generation condition information J is a condition for performing power generation operation in the power generation unit 12. In this embodiment, the operation of the heat source device 30 is a condition for power generation operation, and when there is an input from the operation panel 50 to start floor heating or to start filling the bathtub, the hot water supply time is set for a predetermined time. If it becomes T or more, one of the following conditions is set. The predetermined time T is set, for example, from 10 seconds to 20 seconds, which is shorter than for floor heating or bathtub filling, and is shorter than floor heating or bathtub filling, but it is a time that increases the user's hot water usage time to a certain extent. Can be set. The floor heating time, the bathtub filling time, and the predetermined time T or longer are examples of the power generation possible time of the present invention.

The mixed gas required amount correspondence table T1 is a table for determining the flow rate of the mixed gas supplied to the fuel electrode 20A based on the amount of hydrogen consumed by power generation in the fuel cell stack 20. The amount of heat per unit time required by the heat source device 30 is E0 (hereinafter referred to as "required amount of heat E0"), and the flow rate of the mixed gas that provides the required amount of heat E0 before hydrogen consumption is F0 (hereinafter referred to as "flow rate during non-power generation F0"). , when the calorific value of the fuel electrode off-gas after hydrogen consumption is E1 (hereinafter referred to as "calorific value after hydrogen consumption E1") at the non-power generation flow rate F0, the calorific value of the fuel electrode off-gas after hydrogen consumption is the required calorific value E0. The flow rate F1 (hereinafter referred to as "power generation flow rate F1") can be expressed by the following equation (1).

(1) F1 = F0 × (E0/E1)

The amount of heat after hydrogen consumption E1 can be calculated by subtracting the amount of heat of hydrogen consumed during power generation in the fuel cell stack 20 (in the non-power generation flow rate F0) from the required amount of heat E0. The hydrogen consumption amount X at the non-power generation flow rate F0 increases in proportion to the power generation current in the fuel cell stack 20. Assuming that the Faraday constant is 96485, the molar volume of the mixed gas is 22.4, the generated current is I, and the number of cells in the fuel cell stack 20 is N, the hydrogen consumption amount X can be expressed by the following equation (2). I can do it.

(2) X = 22.4×N×I/(2×96845)

If the heat of combustion (calorific value) of hydrogen per unit mole is E _H2 , and the composition (mole ratio or volume ratio) of hydrogen in the mixed gas is a, then the heat amount of hydrogen consumed in power generation in the fuel cell stack 20 E2 ( The non-power generation flow rate F0) can be expressed by the following equation (3), and E1 can be expressed by the following equation (4).

(3) E2 = E _H2 ×X/22.4
(4) E1 = E0-E2

From (1), (2), (3), and (4) above, the flow rate F1 during power generation can be calculated based on the variable parameters required heat amount E0 and generated current I, and this flow rate F1 during power generation is This is the flow rate at which the blower 24 supplies the mixed gas. In the mixed gas required amount correspondence table T1, a power generation flow rate F1 corresponding to the required heat amount E0 and the generated current I is set, and by referring to the mixed gas required amount correspondence table T1, the flow rate for supplying the mixed gas (power generation flow rate F1) can be easily obtained.

The air-fuel ratio table T2 is for determining the air-fuel ratio λ of the mixed gas based on the flow rate F1 of the mixed gas during power generation and the composition (mole ratio) of hydrogen in the fuel electrode off-gas supplied to the burner 32. It's a table. As an example, an air-fuel ratio table T2 shown in FIG. 3 can be used. Based on the air-fuel ratio λ obtained from the air-fuel ratio table T2, the required amount of combustion air for each component in the fuel electrode off-gas (hereinafter referred to as "required amount of combustion air FA") is calculated using the following formula (5), and the total amount is calculated using the following formula (5). The required amount of combustion air FA can be calculated by: Z is the composition ratio of each component, and Y is the O2 stoichiometric mixing ratio of each component, which differs for each component.

(5) FA=Y×F1×(Z×carbon (C) amount + Z×hydrogen (H) amount)/0.21×λ

As described above, since hydrogen is consumed in the power generation reaction in the fuel cell stack 20, a change in the power generation current I causes a change in the composition ratio of the hydrogen component in the fuel electrode off-gas. Thereby, the required amount of combustion air FA can be calculated based on the changing air-fuel ratio λ.

The controller 40 is connected to the air supply blower 22, the fuel supply blower 24, the power conditioner 26, the combustion air supply blower 28, the burner 32, the operation panel 50, and the like. The operation panel 50 includes a display, a lamp, a switch, etc., allows the user to input various instructions, and displays the status of the heat source system 10A.

Next, the operation of the heat source device system 10A will be explained.

When the user turns on the power of the heat source device system 10A from the operation panel 50, the controller 40 executes the power generation control process shown in FIG. 4.

In step S10, it is determined whether there is an instruction to drive the heat source device 30, and if the determination is affirmative, driving of the heat source device 30 is started in step S12. If the determination is negative, the system waits until an instruction to drive the heat source device is given. The drive instruction for the heat source device 30 is given by a user's input from the operation panel 50 (starting floor heating, filling the bathtub, etc.), or by issuing tap water exceeding the minimum ignition flow rate.

When the heat source device 30 starts driving, the fuel supply blower 24 is driven, and the mixed gas is passed through the desulfurizer 14 and the fuel electrode 20A of the fuel cell stack 20 without reforming from the gas conduit G to the burner of the heat source device 30. 32. Then, the mixed gas (fuel electrode off-gas) is combusted in the burner 32, and water, which is a fluid to be heated and supplied to the heat exchanger 34, is heated by the combustion heat. In this embodiment, water is used as an example of the fluid to be heated, but other fluids such as antifreeze (in the case of floor heating) may be used. The supply of the mixed gas by the fuel supply blower 24 here is performed at a non-power generation flow rate F0 of the mixed gas that provides the required heat amount E0. The required amount of heat E0 is set based on the user's requested hot water flow rate, requested hot water temperature, and the like.

In step S14, it is determined whether the power generation conditions are satisfied. Whether or not the power generation conditions are satisfied is determined by whether or not the power generation condition information J stored in the storage unit 45 is satisfied. In the present embodiment, the determination is made when there is an input from the operation panel 50 to start floor heating, when there is an input to start filling the bathtub, and when the hot water supply time is longer than the predetermined time T after tap water starts flowing. Affirmed.

If it is determined in step S14 that the power generation conditions are satisfied, an instruction to start power generation operation in the power generation unit 12 is output in step S16. When power generation starts, the air supply blower 22 is driven to supply air to the air electrode 20B, and the power conditioner 26 starts generating power from the fuel cell stack 20. In the power conditioner 26, the power generation output is controlled according to the power load. If the non-power generation flow rate F0 of the mixed gas is less than the amount of hydrogen required for power generation corresponding to the power load, the maximum output is set within the non-power generation flow rate F0.

As a result, the hydrogen in the mixed gas supplied to the fuel cell stack 20 is used for the power generation reaction and consumed, and the fuel electrode off-gas after hydrogen consumption is supplied to the burner 32. In the burner 32, fuel electrode off-gas after hydrogen consumption in the fuel cell stack 20 is burned.

Next, in step S30, a flow rate adjustment process is executed. As shown in FIG. 5, in the flow rate adjustment process, it is determined in step S32 whether or not there is a change in the amount of power generation, and if there is no change in the amount of power generation, the flow rate adjustment process is ended and the process proceeds to step S18. Proceed to. If there is a change in the amount of power generation, the generated current I is acquired in step S33, and the flow rate F1 during power generation is determined in step S34. The power generation flow rate F1 is determined based on the required amount of heat E0 and the power generation current I with reference to the mixed gas required amount correspondence table T1.

Next, in step S35, the required amount of combustion air FA is determined. The required amount of combustion air FA is determined using the air-fuel ratio λ obtained from the air-fuel ratio table T2 based on the flow rate F1 during power generation and the composition (molar ratio) of hydrogen in the fuel electrode off-gas supplied to the burner 32. It can be calculated using the above-mentioned equation (5).

Then, in step S36, the fuel supply blower 24 is controlled to adjust the mixed gas flow rate to the power generation flow rate F1, and in step S37, the combustion air supply blower 28 is controlled to supply the mixed gas to the burner 32. Adjust the combustion air to the required combustion air amount FA.

Next, in step S18, it is determined whether there is an instruction to stop the heat source device 30, and if there is no instruction to stop the heat source device 30, the flow rate adjustment process in step S30 is repeated. If there is an instruction to stop the heat source device 30, the instruction to stop the heat source device 30 is output in step S20, and the power generation operation of the power generation unit 12 is stopped in step S22.

In step S24, it is determined whether there is an instruction to stop the heat source device system 10A, and if the determination is affirmative, this process is ended. If there is no instruction to stop the heat source device system 10A, the process returns to step S10 and the above process is repeated.

In the heat source device system 10A of this embodiment, hydrogen in the mixed gas is used for power generation in the fuel cell stack 20, and combustible components such as methane that are not used in the fuel cell stack 20 are used in the heat source device 30. Therefore, the mixed gas can be used more efficiently than when the mixed gas containing hydrogen and methane is combusted and used only by the burner 32 of the heat source device 30.

Further, since hydrogen is included in the mixed gas supplied to the fuel cell stack 20, a reformer is not required and a simple configuration can be achieved.

Furthermore, in this embodiment, since the mixed gas is supplied to the fuel cell only when the heat source device 30 is operating, the fuel electrode off-gas containing combustible components, which is discharged from the fuel cell stack 20, is not discharged to the outside. It can be appropriately processed in the heat source device 30.

Furthermore, in the present embodiment, when it is determined that the continuous operation time of the heat source device 30 is longer than the floor heating time, the bathtub filling time, and the predetermined time T, the power generation operation of the fuel cell stack 20 is started. Therefore, inefficient power generation operation of the fuel cell stack 20 can be suppressed. Note that it is not necessarily necessary that the power generation operation of the fuel cell stack 20 is started when it is determined that the continuous operation time of the heat source device 30 is longer than the floor heating time, bathtub filling time, and predetermined time T. Alternatively, the power generation operation of the fuel cell stack 20 may be started at the same time as the heat source device 30 is driven.

Furthermore, in this embodiment, in consideration of the amount of heat consumed by the power generation of the fuel cell stack 20, the fuel supply blower is set so that the amount of heat of the fuel electrode off-gas supplied to the burner 32 becomes the amount of heat required by the heat source device 30. At 24, the flow rate of the mixed gas supplied is adjusted. Therefore, fuel electrode off-gas having an appropriate amount of heat can be supplied to the burner.

Furthermore, in this embodiment, the flow rate of combustion air supplied to the burner 32 is adjusted based on the flow rate of the mixed gas supplied by the fuel supply blower 24 and the composition of the fuel electrode off-gas supplied to the burner 32. Therefore, an appropriate amount of air that improves combustion efficiency can be supplied to the burner 32.

Note that in this embodiment, the mixed gas flow rate (power generation flow rate F1) is adjusted based on the change in the power generation output (power generation current I) of the fuel cell stack 20 so that the fuel electrode off-gas has the required heat amount E0. , may be adjusted by other means. For example, a meter for measuring gas calorific value is installed in the fuel electrode off-gas pipe P3, and feedback control is performed so that the calorific value measured by the meter becomes the required calorific value E0, and the mixed gas flow rate (flow rate F1 during power generation) is adjusted. May be adjusted.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented with various modifications other than the above without departing from the spirit thereof. be.

10A Heat source device system 20 Fuel cell cell stack (fuel cell)
20A Fuel electrode 24 Fuel supply blower (fuel supply section)
28 Combustion air supply blower (combustion air supply section)
30 Heat source device 32 Burner 34 Heat exchanger 40 Controller (control unit)
E0 Required heat amount G Gas pipe I Generated current (generated output)

Claims (5)

A fuel cell in which a mixed gas containing hydrocarbons and hydrogen as main components supplied from a gas conduit is supplied to a fuel electrode by a fuel supply section, and the hydrogen in the mixed gas is used in a power generation reaction to generate electricity;
a heat source device comprising: a burner that burns fuel electrode off-gas discharged from the fuel electrode of the fuel cell; and a heat exchanger that exchanges heat between the combustion heat of the burner and a fluid to be heated;
a control unit that adjusts the flow rate of the mixed gas supplied by the fuel supply unit so that the amount of heat of the fuel electrode off-gas becomes the amount of heat required by the heat source device;
A heat source system equipped with The control unit controls the flow rate of the mixed gas supplied by the fuel supply unit, based on the required amount of heat and the power generation output of the fuel cell, so that the amount of heat of the fuel electrode off-gas becomes the amount of heat required by the heat source device. make adjustments,
The heat source device system according to claim 1. The control unit controls the output of the fuel cell and the fuel supply unit so that the fuel cell outputs power according to the power load of the power supply destination.
The heat source device system according to claim 1 or claim 2. comprising a combustion air supply section that sends combustion air to the burner,
The control unit is configured to adjust the flow rate of air supplied to the burner based on the flow rate of the mixed gas supplied by the fuel supply unit and the composition of the fuel electrode off-gas supplied to the burner. controlling the combustion air supply;
The heat source device system according to any one of claims 1 to 3. The control unit controls the fuel supply unit so that the mixed gas is supplied to the fuel electrode only when there is an operation request to the heat source device.
The heat source device system according to any one of claims 1 to 4.