JP7010022B2 - Fuel cell system - Google Patents

Description

The present invention relates to a fuel cell system.

As a type of fuel cell system, the fuel cell system shown in Patent Document 1 is known. In the fuel cell system of Patent Document 1, before igniting the combustion part in the start-up operation, the fuel of the fuel cell that can be adsorbed to the adsorption part and the sulfur contained in the fuel are used based on the temperature of the adsorption part of the adsorption device. The amount of adsorbent (adsorbable amount) is derived, and fuel is supplied to the adsorbent by the amount that can be adsorbed and adsorbed so that the total amount of adsorbent adsorbed on the adsorbent (adsorbed amount) is saturated. It drives a raw material pump.

After that, when fuel is supplied to the fuel cell to ignite the combustion part, the fuel is not adsorbed to the adsorption part because the adsorption amount of the adsorption part is saturated, so that the combustion part ignites. Sufficient fuel flow is secured. In this way, before the combustion part is ignited, fuel is supplied in an amount that can be adsorbed to saturate the adsorption amount of the adsorption part, so that it is possible to reduce the cost in the operation of the fuel cell system. can.

Japanese Unexamined Patent Publication No. 2017-152250

However, when the ratio of the fuel component fluctuates, it is conceivable that the adsorbed amount of the adsorbed portion in the saturated state fluctuates. The proportion of the fuel component varies depending on the region when the fuel is natural gas, and varies depending on the amount of LPG used when the fuel is LPG supplied from a gas cylinder. In the fuel cell system of Patent Document 1 described above, even if the adsorbent is adsorbed to the adsorbed portion by the amount of adsorbable amount derived based on the temperature of the adsorbed portion due to the fluctuation of the ratio of the fuel component, the adsorbed portion It is considered that the adsorption amount may not be saturated. In this case, even if the fuel is supplied to the fuel cell to ignite the combustion part, the fuel is adsorbed on the adsorption part, so that the flow rate of the fuel for igniting the combustion part is insufficient and the combustion part is not ignited. Will be.

Therefore, the present invention has been made to solve the above-mentioned problems, and even when the fuel composition fluctuates in the fuel cell system, the combustion portion is ignited in the start-up operation at a relatively low cost. The purpose is to saturate the amount of adsorbent adsorbed on the adsorbent of the adsorber.

In order to solve the above problems, the fuel cell system according to claim 1 is directly supplied from a source and has a odorant added, or is supplied from a source and has an odorant. A fuel that is a reformed fuel to which the reforming raw material is added, a fuel cell that generates power by using an oxidizing agent gas, and a fuel or a reforming raw material that is directly distributed from the supply source to the fuel cell. A fuel supply device that is placed in the fuel supply pipe to directly supply fuel or raw materials for reforming, a combustion unit that burns fuel off gas and oxidant off gas derived from the fuel cell, and a fuel supply pipe. A suction device having a suction part that detachably adsorbs the adsorbent and changes the temperature in correlation with the temperature of the fuel cell, a temperature sensor that detects the temperature of the suction part, and at least the fuel cell. A fuel cell system equipped with a control device to control, the adsorbent is an odorant, a direct fuel and a raw material for reforming, and the control device is the temperature of the adsorption part and the adsorption that can be adsorbed to the adsorption part. Preparations for power generation of a fuel cell and a storage unit that stores a plurality of correlations showing a relationship with an adsorption saturation amount, which is a quality saturation amount, and in which the ratios of predetermined components of the adsorbate are different from each other. When the start-up operation to be performed is started, one of the multiple correlations is selected, and the current saturation amount, which is the adsorption saturation amount corresponding to the current detection temperature of the temperature sensor in one correlation, and the reference. The adsorptionable amount derivation unit that executes the derivation control that derives the difference from the reference saturation amount, which is the adsorption saturation amount, as the adsorbable amount, which is the amount of the adsorbent that the adsorbent can adsorb, and the adsorbable amount derivation unit. After the adsorption control unit executes the adsorption control to adsorb the adsorbate to the adsorption unit by supplying only the adsorbable amount derived by the derivation control by the fuel supply device, and the adsorption control unit executes the adsorption control. , A determination to determine whether or not the combustion unit has been ignited when the ignition control unit is supplied by the fuel supply device and the ignition control unit ignites the combustion unit and the ignition control unit executes the ignition control. When the judgment control unit that executes control and the judgment control of the judgment control unit determine that the combustion unit is not ignited, repeat control that repeatedly executes derivation control, adsorption control, ignition control, and judgment control. A control unit and an adsorbable amount derivation unit are provided with one correlation when the derivation control is executed by the repetition control of the repetition control unit, and one correlation used in the previously executed derivation control. However, the ratio of the predetermined component of the adsorbent is different. By selecting the other correlation from the plurality of correlations in which the current saturation amount has increased, and setting the reference saturation amount to the current saturation amount derived by the derivation control executed last time, Perform derivation control.

Even after the start-up operation is started and the derivation control, adsorption control, and ignition control are executed, if the combustion unit is not ignited, the amount of adsorption of the adsorption unit due to the fluctuation of the ratio of the predetermined component of the adsorbent. Is not saturated, the direct fuel or reforming raw material supplied from the supply source is adsorbed on the adsorption part, and the flow rate of the direct fuel or reforming raw material led out from the fuel cell to the combustion part is insufficient. It is possible that you are doing it. On the other hand, in the fuel cell system of the present invention, when the combustion unit is not ignited, the derivation control, the adsorption control, the ignition control and the determination control are repeatedly executed by the determination control, and when the derivation control is executed, the derivation control is executed. One correlation is selected as the other correlation whose current saturation amount is higher than the correlation used in the previous derivation control, and the reference saturation amount is the current saturation amount used in the previous derivation control. Is set to. As a result, the adsorbable amount derived by the current derivation control is derived as a shortage of the current saturation amount derived by the previous derivation control with respect to the actual adsorption saturation amount of the adsorbed portion. Therefore, the fuel cell system can directly or re-supply the reforming raw material by the amount of the shortage of the actual adsorption saturation amount of the adsorption portion. Therefore, in the fuel cell system, even when the composition of the direct fuel or the reforming raw material fluctuates, the adsorption amount of the adsorption portion is saturated before the combustion portion is ignited in the start-up operation at a relatively low cost. be able to.

It is a schematic diagram which shows one Embodiment of the fuel cell system by this invention. It is a block diagram of the fuel cell system shown in FIG. It is a map stored in the storage unit shown in FIG. It is a flowchart which the control device shown in FIG. 2 executes.

Hereinafter, an embodiment of the fuel cell system according to the present invention will be described. The fuel cell system 1 includes a power generation unit 10 and a hot water storage tank 21. The power generation unit 10 includes a housing 10a, a fuel cell module 11 (30), a heat exchanger 12, an inverter device 13, a water tank 14, and a control device 15.

The fuel cell module 11 includes at least a fuel cell 34 as described later. The fuel cell module 11 is supplied with a reforming raw material, reforming water, and cathode air (described later).

The heat exchanger 12 is a heat exchanger in which the combustion exhaust gas exhausted from the fuel cell module 11 is supplied and the hot water stored from the hot water storage tank 21 is supplied, and the combustion exhaust gas and the hot water stored water exchange heat. Specifically, the hot water storage tank 21 stores hot water, and a hot water storage water circulation line 22 through which the hot water is circulated (circulated in the direction of the arrow in the figure) is connected.

On the hot water storage water circulation line 22, the hot water storage water circulation pump 22a and the heat exchanger 12 are arranged in order from the lower end to the upper end. An exhaust pipe 11d from the fuel cell module 11 is connected (penetrated) to the heat exchanger 12. The heat exchanger 12 is connected to the condensed water supply pipe 12a connected to the water tank 14.

In the heat exchanger 12, the combustion exhaust gas from the fuel cell module 11 is introduced into the heat exchanger 12 through the exhaust pipe 11d, and heat is exchanged with the hot water to be cooled and in the combustion exhaust gas. Steam is condensed. The exhaust gas after cooling is discharged to the outside through the exhaust pipe 11d. Further, the condensed condensed water is supplied to the water tank 14 through the condensed water supply pipe 12a. The water tank 14 purifies the condensed water with an ion exchange resin and stores it as reformed water. The waste heat recovery system 20 is configured from the heat exchanger 12, the hot water storage tank 21, and the hot water storage water circulation line 22 described above. The waste heat recovery system 20 collects and stores the waste heat of the fuel cell module 11 in the hot water storage water.

The inverter device 13 inputs a DC voltage output from the fuel cell 34, converts it into a predetermined AC voltage, and connects it to a power supply line 16b connected to an AC system power supply 16a and an external power load 16c (for example, an electric appliance). Output. Further, the inverter device 13 inputs the AC voltage from the system power supply 16a via the power supply line 16b, converts it into a predetermined DC voltage, and outputs the AC voltage to the auxiliary equipment (each pump, blower, etc.) and the control device 15. The control device 15 controls at least the fuel cell 34.

The fuel cell module 11 (30) includes a casing 31, an evaporation unit 32, a reforming unit 33, and a fuel cell 34. The casing 31 is made of a heat insulating material and is formed in a box shape.

The evaporation unit 32 generates steam from the reformed water. The evaporation unit 32 is heated by the combustion gas described later to evaporate the reforming water to generate steam (steam for reforming) and derive it. Further, the evaporation unit 32 preheats the supplied reforming raw material. The evaporating unit 32 mixes the steam generated by evaporating the reforming water (steam for reforming) and the preheated raw material for reforming and leads to the reforming unit 33.

Raw materials for reforming include gas fuels for reforming such as natural gas (methane gas), city gas, and LPG (liquefied petroleum gas). In the present embodiment, propane, butane (corresponding to a predetermined component of the present invention), etc. Will be described with respect to LPG, which is a gas having the above as a component. An odorant is added to the reforming raw material, for example, in order to make it easier to detect the leakage of the reforming raw material by the odor. The odorant is an organic sulfur compound, for example, tertiary butyl mercaptan or dimethyl sulfide.

The reformed water from the water tank 14 is supplied to the evaporation unit 32 via the water supply pipe 41. The water supply pipe 41 is provided with a reformed water pump 41a. The reforming water pump 41a supplies the reforming water to the evaporation unit 32. The reforming water pump 41a adjusts the flow rate of the reforming water (flow rate per unit time) according to the control command value from the control device 15.

Further, the reforming raw material from the supply source Gs is supplied to the evaporation unit 32 via the raw material supply pipe 42 (corresponding to the fuel supply pipe of the present invention). The source Gs is, for example, an LPG gas cylinder. The raw material supply pipe 42 distributes the reforming raw material from the supply source Gs to the evaporation unit 32 and thus to the fuel cell 34. A raw material pump 42a (corresponding to the fuel supply device of the present invention) and a desulfurizer 42b (corresponding to the adsorption device of the present invention) are arranged in the raw material supply pipe 42 in order from the upstream.

The raw material pump 42a supplies the reforming raw material from the supply source Gs. Specifically, the raw material pump 42a is arranged between the supply source Gs and the desulfurization device 42b, and supplies the reforming raw material from the supply source Gs to the desulfurization device 42b, the evaporation unit 32, and the fuel cell 34. The raw material pump 42a adjusts the flow rate (flow rate per unit time) of the reforming raw material according to the control command value from the control device 15.

The desulfurizer 42b is arranged in the raw material supply pipe 42, and has an adsorbent portion 42b1 that desorbably adsorbs the adsorbent when the reforming raw material is distributed. Specifically, the desulfurizer 42b is arranged between the raw material pump 42a in the raw material supply pipe 42 and the evaporation unit 32. The adsorbent is an odorant (organosulfur compound) added to the reforming raw material.

The adsorbent 42b1 contains an adsorbent that adsorbs the adsorbent. The adsorbent is a porous material such as zeolite carrying a metal such as silver or copper. The desulfurization device 42b is arranged so that the temperature of the adsorption portion 42b1 is relatively high (about 50 ° C. or higher) in order to secure the adsorption (desulfurization) performance for the odorant added to the reforming raw material. There is.

Specifically, the desulfurization device 42b is arranged in contact with or close to the outer wall surface of the casing 31 so that the adsorption portion 42b1 receives heat from the fuel cell module 30. The temperature of the fuel cell module 30 rises with the temperature of the fuel cell 34 due to the heat generated by the power generation of the fuel cell 34. Therefore, the temperature of the adsorption portion 42b1 of the desulfurizer 42b that receives heat from the fuel cell module 30 increases as the temperature of the fuel cell 34 increases. Therefore, the temperature of the adsorption portion 42b1 changes in a correlation with the temperature of the fuel cell 34. As described above, the desulfurizer 42b is arranged at the portion (casing 31) where the temperature changes in correlation with the temperature of the fuel cell 34.

Further, the adsorption unit 42b1 can not only adsorb the odorant contained in the reforming raw material, but also adsorb the reforming raw material itself (mainly hydrocarbon). That is, not only the odorant but also the reforming raw material corresponds to the adsorbent.

The adsorption saturation amount, which is the saturation amount of the adsorbent that can be adsorbed on the adsorption unit 42b1, changes depending on the temperature of the adsorption unit 42b1. Specifically, as the temperature of the adsorption portion 42b1 decreases, the adsorption saturation amount increases. The adsorption saturation amount is the amount of the adsorbate in the equilibrium state (saturation state) in which the adsorbate is adsorbed or desorbed from the adsorption portion 42b1 by changing the temperature of the adsorption portion 42b1.

Since the amount of the odorant contained in the reforming raw material is extremely small (about 10 ppm), the adsorbent even when the total amount (adsorbed amount) of the adsorbent adsorbed on the adsorbent approaches the adsorption saturation amount. The odorant is adsorbed at the portion where the adsorbent is not adsorbed.

Further, the amount of adsorption saturation also changes depending on the composition of the reforming raw material. For example, butane contained in the reforming raw material is more easily adsorbed on the adsorption portion 42b1 than other components. Therefore, at the temperature of the arbitrary adsorption portion 42b1, the adsorption saturation amount increases as the proportion of butane in the reforming raw material increases.

The reforming unit 33 reforms (steam reforming) the reforming raw material using the steam from the evaporation unit 32. The reforming unit 33 generates a reforming gas (corresponding to the reforming fuel of the present invention) from the reforming raw material and steam. Specifically, the reforming unit 33 is heated by a combustion gas described later and is supplied with the heat required for the steam reforming reaction, so that the mixed gas supplied from the evaporation unit 32 (raw material for reforming, reforming). Reformed gas is generated and derived from (steam for quality).

The reforming unit 33 is filled with a catalyst (for example, a Ru or Ni-based catalyst), and the mixed gas reacts with the catalyst to reform and generate hydrogen gas and carbon monoxide gas (so-called). Steam reforming reaction). At the same time, a so-called carbon monoxide shift reaction occurs in which carbon monoxide generated in the steam reforming reaction reacts with steam to transform into hydrogen gas and carbon dioxide. These generated gases (reformed gas) are led out to the fuel electrode of the fuel cell 34. The reforming gas includes hydrogen, carbon monoxide, carbon dioxide, steam, unreformed propane, and reformed water (steam) that was not used for reforming. The steam reforming reaction is an endothermic reaction, and the carbon monoxide shift reaction is an exothermic reaction.

The fuel cell 34 generates power by using a fuel (fuel gas) and an oxidant gas (cathode gas). The fuel (fuel gas) is a reformed gas supplied from the supply source Gs and reformed with a reforming raw material to which an odorant is added. The oxidant gas (cathode gas) is air (cathode air). The fuel cell 34 is configured by stacking a plurality of cells 34a composed of a fuel electrode, an air electrode (oxidizing agent electrode), and an electrolyte interposed between the two electrodes along the left-right direction in FIG.

The fuel cell 34 of the present embodiment is a solid oxide fuel cell, and uses zirconium oxide, which is a kind of solid oxide, as an electrolyte. Hydrogen, carbon monoxide, propane gas, or the like is supplied as fuel to the fuel electrode of the fuel cell 34. The operating temperature is about 400 to 1000 ° C.

A fuel flow path 34b through which the reformed gas, which is a fuel, flows is formed on the fuel electrode side of the cell 34a. An air flow path 34c through which air (cathode air) flows is formed on the air electrode side of the cell 34a.

The fuel cell 34 is provided on the manifold 35. The reforming gas from the reforming section 33 is supplied to the manifold 35 via the reforming gas supply pipe 38. The lower end (one end) of the fuel flow path 34b is connected to the fuel outlet (not shown) of the manifold 35 so that the reformed gas derived from the fuel outlet is introduced from the lower end and led out from the upper end. It has become. On the other hand, the air sent out by the cathode air blower 43a is supplied through the cathode air supply pipe 43, is introduced from the lower end of the air flow path 34c, and is led out from the upper end.

The cathode air blower 43a supplies air (cathode air) to the fuel cell 34. The cathode air blower 43a is arranged in the power generation unit 10, sucks the air in the power generation unit 10, and discharges it to the air electrode of the fuel cell 34. The cathode air blower 43a adjusts the air flow rate (flow rate per unit time) according to the control command value from the control device 15.

In the fuel cell 34, power generation is performed by the reforming gas supplied to the fuel electrode and the oxidant gas (air) supplied to the air electrode. That is, at the fuel electrode, the reactions shown in Chemical formulas 1 and 2 below occur, and at the air electrode, the reactions shown in Chemical formula 3 below occur. That is, the oxide ion (O ^2- ) generated at the air electrode permeates the electrolyte and reacts with hydrogen at the fuel electrode to generate electric energy. Therefore, the fuel (reform gas) and the oxidant gas (air) that were not used for power generation are derived from the fuel flow path 34b and the air flow path 34c.
(Chemical 1)
H ₂ + O ^2- → H ₂ O + ^2e-
(Chemical 2)
CO + O ^2- → CO ₂ + ^2e-
(Chemical 3)
1 / 2O ₂ + ^2e- → O ^2-

Further, the fuel cell 34 is provided with a first temperature sensor 34d (corresponding to the temperature sensor of the present invention) for detecting the temperature of the fuel cell 34. The first temperature sensor 34d detects the temperature of the fuel cell 34 at the arranged position. As described above, the temperature of the adsorption portion 42b1 has a correlation with the temperature of the fuel cell 34. Therefore, the first temperature sensor 34d indirectly detects the temperature of the suction unit 42b1.

Further, a combustion unit 36 is provided between the fuel cell 34 and the evaporation unit 32 and the reforming unit 33. The combustion unit 36 burns the anode off gas (corresponding to the fuel off gas of the present invention) and the cathode off gas (corresponding to the oxidant off gas of the present invention) derived from the fuel cell 34. Anode off gas is a fuel (reformed gas) that was not used for power generation. The cathode off gas is an oxidant gas (air) that was not used for power generation.

In the combustion unit 36, the anode off gas and the cathode off gas are burned to generate a combustion gas (flame 37). The combustion gas heats the evaporation unit 32 and the reforming unit 33. Further, the combustion gas sets the temperature inside the fuel cell module 30 to the operating temperature of the fuel cell 34. The combustion unit 36 is provided with a pair of ignition heaters 36a for igniting the anode off gas.

Further, in the combustion unit 36, the anode off gas is ignited and burned, so that relatively high temperature combustion exhaust gas is generated. The combustion exhaust gas is exhausted from the fuel cell module 30 via the exhaust pipe 11d. Further, the combustion unit 36 is provided with a second temperature sensor 36b for detecting the temperature of the combustion unit 36. The second temperature sensor 36b detects the temperature of the combustion unit 36 at the arranged position.

The control device 15 drives an auxiliary machine to control the operation of the fuel cell system 1. The operation of the fuel cell system 1 has an operation mode and a standby mode. The operation mode is a mode in which the fuel cell system 1 is operated in the order of start operation, power generation operation, and stop operation.

The start-up operation is an operation for preparing the fuel cell 34 for power generation. In the start-up operation, the combustion unit 36 is ignited to burn it, and the temperature of the fuel cell 34 is raised to the operating temperature (details will be described later). When the start-up operation is completed, the power generation operation is started.

The power generation operation is an operation in which the combustion unit 36 is burned to generate power in the fuel cell 34. In the power generation operation, the control device 15 controls the auxiliary equipment so that the power generated by the fuel cell 34 becomes the power consumption of the external power load 16c (load follow-up operation).

The stop operation is an operation of stopping the power generation of the fuel cell 34. During the power generation operation, the stop operation is started when the stop switch (not shown) is pressed to stop the power generation operation or when the power generation operation is stopped according to the operation plan. In the stop operation, the control device 15 stops the supply of the reforming raw material and the reforming water to the evaporation unit 32, and stops the supply of the reforming gas and the air to the fuel cell 34. When the combustion of the combustion unit 36 is completed and the power generation of the fuel cell 34 by the residual raw material is completed, the stop operation is completed.

As described above, the operation mode is a mode in which at least the start-up operation and the power generation operation in which the combustion unit 36 is burned to generate power in the fuel cell 34 are performed. When the stop operation is completed, the operation mode is stopped and the standby mode is started.

The standby mode is a mode in which the operation mode is stopped, the combustion unit 36 is not burned, and the fuel cell 34 does not generate power, and the mode is waiting for the start of the operation mode. When the fuel cell system 1 is in the standby mode, for example, when the start switch (not shown) is turned on to start the operation mode, the standby mode ends and the operation mode starts.

As shown in FIG. 2, the control device 15 includes a storage unit 15a, a temperature acquisition unit 15b, an adsorptionable amount derivation unit 15c, an adsorption time calculation unit 15d, an adsorption control unit 15e, an ignition control unit 15f, a determination control unit 15g, and power generation. It includes an operation start unit 15h, a count unit 15i, an operation stop unit 15j, and a repeat control unit 15k.

The storage unit 15a stores a plurality of (five in this embodiment) correlations C1 to C5. The plurality of correlations C1 to C5 show the relationship between the temperature of the adsorption unit 42b1 and the adsorption saturation amount, which is the saturation amount of the adsorbent that can be adsorbed on the adsorption unit 42b1 (see FIG. 3). In the present embodiment, the temperature of the suction portion 42b1 corresponds to the detection temperature of the first temperature sensor 34d arranged in the fuel cell 34 (hereinafter, referred to as the first detection temperature). As described above, the plurality of correlations C1 to C5 are related in that the adsorption saturation amount increases as the temperature of the adsorption portion 42b1 decreases.

Further, the plurality of correlations C1 to C5 are set so that the proportions of predetermined components (butane) of the adsorbent are different from each other. The proportion of butane in the plurality of correlations C1 to C5 is determined in the order of the first correlation C1, the second correlation C2, the third correlation C3, the fourth correlation C4, and the fifth correlation C5. It is set to 0, 5, 10, 15, 20%. As described above, as the proportion of butane increases, the amount of adsorption saturation corresponding to the temperature of the arbitrary adsorption portion 42b1 increases.

Further, the storage unit 15a stores the first detection temperature of the first temperature sensor 34d at the time when the operation mode of the fuel cell system 1 is stopped (the time when the stop operation is completed).

In the temperature acquisition unit 15b, the first detection temperature of the first temperature sensor 34d, the detection temperature of the second temperature sensor 36b (hereinafter referred to as the second detection temperature), and the operation mode stored in the storage unit 15a are stopped. Obtain the first detection temperature at the time of

The adsorbable amount derivation unit 15c executes derivation control when the start-up operation is started. In the derivation control, one of a plurality of correlations C1 to C5 is selected, and the current saturation amount, which is the adsorption saturation amount corresponding to the current first detection temperature of the first temperature sensor 34d in one correlation, is used. This is a control for deriving the difference from the reference saturation amount, which is the reference adsorption saturation amount, as the adsorbable amount, which is the amount of the adsorbent that can be adsorbed by the adsorption unit 42b1.

When the start-up operation is started in the current operation mode and the derivation control is executed first, the first correlation C1 corresponding to the correlation having the lowest proportion of butane is selected as one correlation. Further, in this case, the reference saturation amount is the adsorption saturation amount corresponding to the first detection temperature at the stop time of the operation mode immediately before the current operation mode (hereinafter referred to as the stop temperature T0) in one correlation. And. Specifically, in FIG. 3, the stop saturation amount S0, which is the adsorption saturation amount corresponding to the stop temperature T0 in the first correlation C1, is set as the reference saturation amount.

Further, when the current first detection temperature is the first temperature T1, the first saturation amount S1 which is the adsorption saturation amount corresponding to the first temperature T1 in the first correlation C1 is derived as the current saturation amount. Therefore, when the derivation control is first executed in the current operation mode, the first adsorption amount Q1 corresponding to the difference between the first saturation amount S1 and the stop saturation amount S0 is derived as the adsorbable amount. The case where the derivation control is repeatedly executed in the current operation mode will be described later.

The adsorption time calculation unit 15d calculates the adsorption time for adsorbing the adsorbent to the adsorption unit 42b1. The adsorption time is the reforming that is supplied to the adsorption unit 42b1 from the start of the supply of the reforming raw material by the raw material pump 42a when the reforming raw material is supplied by the raw material pump 42a at the first predetermined flow rate. It is the time until the total amount of raw materials becomes the adsorbable amount. That is, the adsorption time is calculated by dividing the adsorbable amount derived by the derivation control by the first predetermined flow rate (adsorption time = adsorbable amount / first predetermined flow rate).

In the first predetermined flow rate, when the reforming raw material is exhausted to the outside from the exhaust pipe 11d through the fuel cell 34 and the combustion unit 36, the concentration of the reforming raw material is the lower explosive limit (LEL) of the reforming raw material. ) Is set to a flow rate that is equal to or less than the concentration in consideration of a predetermined safety factor (for example, twice).

The adsorption control unit 15e executes adsorption control. The adsorption control is a control in which the adsorbent is adsorbed to the adsorption unit 42b1 by supplying only the adsorbable amount derived by the derivation control of the adsorbable amount derivation unit 15c by the raw material pump 42a. Specifically, the adsorption control drives the raw material pump 42a so that the reforming raw material is derived at the first predetermined flow rate for the adsorption time.

After the adsorption control is executed, the ignition control unit 15f supplies the raw material pump 42a and executes the ignition control to ignite the combustion unit 36. Specifically, the ignition control drives the raw material pump 42a and turns on the ignition heater 36a so that the reforming raw material is derived at the second predetermined flow rate for a predetermined time. The second predetermined flow rate is smaller than the first predetermined flow rate, and is set to a flow rate at which the reforming raw material and thus the combustion unit 36 can be ignited by the ignition heater 36a. The predetermined time is, for example, 10 seconds.

The determination control unit 15g determines whether or not the combustion unit 36 has been ignited when the ignition control is executed by the ignition control unit 15f. When the second detection temperature of the second temperature sensor 36b is equal to or higher than the determination temperature (for example, 700 ° C.), the determination control unit 15g determines that the combustion unit 36 has ignited.

When it is determined by the determination control that the combustion unit 36 has been ignited, the power generation operation start unit 15h ends the start operation and starts the power generation operation.

When it is determined by the determination control that the combustion unit 36 has not been ignited, the counting unit 15i has executed the derivation control, the adsorption control, the ignition control and the determination control after the start-up operation is started in the current operation mode. It counts the number of times.

The operation stop unit 15j stops the start operation when the derivation control is executed a predetermined number of times or more by the repetition control described later of the repetition control unit 15k. Specifically, the operation stop unit 15j stops (shuts down) the operation of the fuel cell system 1 when the number of times counted by the counting unit 15i becomes a predetermined number of times (for example, 5 times) or more.

The repeat control unit 15k executes repeat control for repeatedly executing derivation control, adsorption control, ignition control, and determination control when it is determined by the determination control of the determination control unit 15g that the combustion unit 36 has not been ignited. be. The repetition control is executed after the counting unit 15i is counted.

Further, when the adsorptionable amount derivation unit 15c executes the derivation control by the repetition control of the repetition control unit 15k, one correlation is applied to one correlation used in the previously executed derivation control. , The current saturation amount increased due to the difference in the ratio of the predetermined component of the adsorbent. Select other correlations from the plurality of correlations C1 to C5, and set the reference saturation amount to the previously executed derivation control. The derivation control is executed by setting the current saturation amount derived from the above (details will be described later). The time when the derivation control is executed by the repetition control of the repetition control unit 15k is when the derivation control is executed when the count number n described later is 1 or more.

Further, the adsorbable amount derivation unit 15c can adsorb in consideration of the amount of adsorbent adsorbed by the supply by the raw material pump 42a in the ignition control when the derivation control is executed by the repetition control of the repetition control unit 15k. Derive the quantity. Specifically, when the derivation control is executed by the repetition control of the repetition control unit 15k, the adsorbable amount corresponds to the current first detection temperature in the other correlations selected in this derivation control. From the difference between the saturation amount and the current saturation amount derived by the previously executed derivation control, the modification supplied by the ignition control executed between the previous derivation control and the current derivation control. It is derived by subtracting the amount of raw materials (total amount = second predetermined flow rate x predetermined time) (details will be described later).

Next, the operation of the fuel cell system 1 from the start of the operation mode of the fuel cell system 1 in the standby mode to the end of the start-up operation and the start of the power generation operation will be described with reference to the flowchart shown in FIG.

In the operation mode of the fuel cell system 1, when the reforming raw material is supplied from the supply source Gs, the adsorption amount of the adsorption unit 42b1 is saturated. Therefore, the adsorption amount of the adsorption unit 42b1 when the operation mode is stopped is the adsorption saturation amount according to the temperature of the adsorption unit 42b1 when the operation mode is stopped. When the fuel cell system 1 is in the standby mode, the adsorbed amount of the adsorbed portion 42b1 does not fluctuate because the reforming raw material is not supplied. Further, in this case, since the fuel cell 34 does not generate electricity, the temperature of the adsorption portion 42b1 decreases, so that the adsorption saturation amount increases. Therefore, in this case, since the adsorbed amount of the adsorbed portion 42b1 is not saturated, the adsorbed portion 42b1 is in a state where the adsorbent can be adsorbed.

The control device 15 confirms whether or not the start switch is turned on in step S102. If the start switch is not turned on, the control device 15 determines "NO" in step S102 and repeatedly executes step S102. On the other hand, when the start switch is turned on, the control device 15 determines "YES" in step S102, ends the standby mode, and starts the operation mode and the start operation.

The control device 15 sets the count number n to zero in step S104 (count unit 15i). The count number n is a number counted by the counting unit 15i. Subsequently, the control device 15 executes the derivation control in step S106 (adsorbable amount derivation unit 15c). Since the derivation control at this time is the first derivation control executed in the current operation mode, as described above, the reference saturation amount corresponds to the stop temperature T0 in the first correlation C1. The quantity is set to S0. When the current first detection temperature is the first temperature T1, the first adsorption amount which is the difference between the first saturation amount S1 corresponding to the first temperature T1 and the stop saturation amount S0 in the first correlation C1. Q1 is derived as an adsorbable amount (see FIG. 3).

Further, the control device 15 calculates the adsorption time in step S108 (adsorption time calculation unit 15d). The adsorption time is calculated by dividing the first adsorption amount Q1 by the first predetermined flow rate. Then, the control device 15 executes adsorption control in step S110 (adsorption control unit 15e). As a result, the reforming raw material is derived at the first predetermined flow rate for the adsorption time, the adsorbent is adsorbed on the adsorbent portion 42b1 by the first adsorption amount Q1, and the adsorption amount of the adsorbent portion 42b1 is approximately the first saturation. The amount is S1.

Subsequently, the control device 15 executes ignition control in step S112 (ignition control unit 15f). As a result, the ignition heater 36a is turned on, and the reforming raw material is supplied from the supply source Gs to the fuel cell 34 at the second predetermined flow rate for a predetermined time. At this time, since the ignition heater 36a is turned on, the temperature of the combustion unit 36 rises. Then, the control device 15 determines whether or not the combustion unit 36 has ignited in step S114.

When the adsorption amount of the adsorption unit 42b1 becomes saturated due to the adsorption amount of the adsorption unit 42b1 being approximately the first saturation amount S1 by the adsorption control, the reforming raw material is not adsorbed on the adsorption unit 42b1, so ignition control is performed. In, the flow rate of the gas (raw material for reforming) derived from the fuel cell 34 is sufficiently secured. In this case, the gas and thus the combustion unit 36 are ignited by the ignition heater 36a, the combustion unit 36 is ignited, and the temperature of the combustion unit 36 further rises. Then, when the second detection temperature becomes equal to or higher than the determination temperature, the control device 15 determines "YES" in step S114, ends the start operation in step S116, and starts the power generation operation (start of power generation operation). Part 15h).

On the other hand, for example, when the actual adsorption saturation amount is larger than the first saturation amount S1 which is the adsorption amount of the adsorption unit 42b1 at present because the ratio of butane in the reforming raw material is more than 0%, the adsorption amount of the adsorption unit 42b1. Is not saturated. In this case, since the reforming raw material supplied by the ignition control is adsorbed on the adsorption portion 42b1, the flow rate of the gas derived from the fuel cell 34 is not sufficiently secured. Therefore, even with the ignition control, the gas is not ignited and the combustion unit 36 does not ignite, and the second detection temperature remains lower than the determination temperature. In this case, the control device 15 determines "NO" in step S114, and increases the count number n by one in step S118 (count unit 15i).

Subsequently, the control device 15 determines in step S120 whether or not the count number n is equal to or greater than a predetermined number of times. For example, since the reforming raw material is not supplied due to an abnormality in the raw material pump 42a, the derivation control to the determination control are repeatedly executed as described later without igniting the combustion unit 36, and the count number n becomes a predetermined number of times or more. If so, the control device 15 determines “YES” in step S120, and stops the operation of the fuel cell system 1 in step S122 (operation stop unit 15j).

On the other hand, when the count number n is less than the predetermined number of times, the control device 15 determines "NO" in step S120, and executes repeat control in step S124 (repetition control unit 15k). Specifically, the control device 15 returns the program to step S106 and executes the derivation control again.

When the derivation control is executed for the second time by the iterative control, that is, when the derivation control is executed when the count number n is 1, the first correlation C1 used in the previous derivation control is struck. Therefore, the second correlation C2 in which the current saturation amount has increased due to the increase in the proportion of butane is selected (see FIG. 3). Further, the reference saturation amount is set to the first saturation amount S1, which is the current saturation amount derived by the derivation control executed last time.

Further, as described above, since the temperature of the combustion unit 36 has increased due to the ignition control, the temperature of the fuel cell 34 and thus the adsorption unit 42b1 has increased. As a result, the current first detection temperature becomes the second temperature T2, which is higher than the first temperature T1, so that the current saturation amount in the derivation control this time is the adsorption corresponding to the second temperature T2 in the second correlation C2. It is derived as the second saturation amount S2 which is the saturation amount. Further, the second adsorption amount Q2, which is the difference between the second saturation amount S2 and the first saturation amount S1, is derived as the adsorbable amount. That is, the adsorbable amount derived by the current derivation control executed by the repetition control is the ratio of butane set in one correlation (first correlation C1) selected in the previous derivation control. And, it is derived as a shortage of the adsorption saturation amount (first saturation amount S1) derived by the previous derivation control with respect to the actual adsorption saturation amount, which is caused by the difference from the actual ratio of butane of the reforming raw material. ..

In addition, the adsorbable amount derived by this derivation control is derived in consideration of the amount of the reforming raw material supplied in the ignition control executed last time (total amount = second predetermined flow rate × predetermined time). .. Specifically, when the combustion unit 36 is not ignited, as described above, the reforming raw material supplied by the ignition control adheres to the adsorption unit 42b1 as an adsorbent, so that the derivation this time is performed. The adsorbable amount derived by control is derived by multiplying the second predetermined flow rate and the predetermined time by subtracting it from the second adsorption amount Q2 (adsorbable amount = second adsorption amount Q2-second predetermined amount). Flow rate x predetermined time).

Subsequently, the control device 15 calculates the adsorption time corresponding to the adsorbable amount again derived by the derivation control executed again by the repeat control in step S108, and adsorbs based on this adsorption time in step S110. Re-execute control. As a result, the adsorption amount of the adsorption unit 42b1 becomes approximately the second saturation amount S2 by adsorbing the adsorbable amount derived by the current derivation control from the first saturation amount S1. Further, the control device 15 re-executes the ignition control in step S112, and executes the determination control in step S114.

Even when the derivation control to the adsorption control are repeated by the repetition control and the adsorption amount of the adsorption unit 42b1 becomes about the second saturation amount S2, if the adsorption amount of the adsorption unit 42b1 is not in the saturated state, it burns as described above. Since the unit 36 does not ignite, the control device 15 determines “NO” in step S114, and further increases the count number n by one (count unit 15i). Then, when the number of counts is less than the predetermined number of times, the control device 15 further executes repeated control in step S124.

When the derivation control is executed as the third time by the iterative control (step S106), the current saturation amount increases due to the increase in the proportion of butane with respect to the second correlation C2 used in the previous derivation control. The third correlation C3 is selected (see FIG. 3). Further, the reference saturation amount is set to the second saturation amount S2, which is the current saturation amount derived by the derivation control executed last time.

Further, since the temperature of the combustion unit 36 has increased due to the ignition control, the temperature of the fuel cell 34 and thus the adsorption unit 42b1 has increased, so that the current first detection temperature becomes the third temperature T3 higher than the second temperature T2. The third adsorption amount Q3, which is the difference between the third saturation amount S3, which is the current saturation amount corresponding to the third temperature T3 in the third correlation C3, and the second saturation amount S2 is derived as the adsorbable amount.

Furthermore, the adsorbable amount derived by this derivation control is the product of the second predetermined flow rate and the predetermined time in consideration of the amount of the reforming raw material supplied in the ignition control executed last time. , Derived as subtracted from the third adsorption amount Q3 (adsorbable amount = third adsorption amount Q3-second predetermined flow rate x predetermined time).

In this way, the amount that can be adsorbed when the derivation control is executed by the repeat control is the current saturation amount, which is the adsorption saturation amount corresponding to the current first detection temperature in the correlation selected in this derivation control. , By further subtracting the amount of reforming raw material (total amount = second predetermined flow rate x predetermined time) supplied by the previous ignition control from the difference from the current saturation amount derived by the previous derivation control. Derived.

Subsequently, the control device 15 calculates the adsorption time based on the adsorbable amount derived by the derivation control executed by the repetition control, and executes the adsorption control (steps S108 to S110). As a result, the adsorption amount of the adsorption portion 42b1 becomes approximately the third saturation amount S3. At this time, when the actual ratio of butane in the reforming raw material is 10% corresponding to the ratio of butane set in the third correlation C3, the adsorption amount of the adsorption portion 42b1 becomes saturated. ..

In this case, when the control device 15 executes ignition control, the reforming raw material is supplied to the fuel cell 34 and thus to the combustion unit 36 without being adsorbed by the adsorption unit 42b1, so that the flow rate of the reforming raw material is sufficient. Secured. Therefore, the ignition heater 36a ignites the reforming raw material and thus the combustion unit 36, and the combustion unit 36 ignites. As a result, when the second detection temperature becomes equal to or higher than the determination temperature, the control device 15 determines "YES" in step S114, and starts the power generation operation in step S116. In this way, the control device 15 repeatedly executes the derivation control to the determination control until the count number n becomes a predetermined number of times or more so that the adsorption amount of the adsorption unit 42b1 is saturated and the combustion unit 36 is ignited. ..

According to the present embodiment, the fuel cell system 1 includes a reformed gas, which is a reformed fuel supplied from a supply source Gs and in which a reforming raw material to which an odorant is added is reformed, and an oxidizing agent. A fuel cell 34 that generates power with gas, a raw material pump 42a that is arranged in a raw material supply pipe 42 that distributes reforming raw materials from the supply source Gs to the fuel cell 34, and supplies the reforming raw materials, and fuel. It is arranged in the raw material supply pipe 42 and the combustion unit 36 that burns the anode off gas and the cathode off gas derived from the battery 34, adsorbs the adsorbate desorbably, and has a correlation with the temperature of the fuel cell 34. It is provided with a desulfurizer 42b having an adsorption unit 42b1 that changes in temperature, a first temperature sensor 34d that detects the temperature of the adsorption unit 42b1, and a control device 15 that at least controls the fuel cell 34. Adsorbents are odorants and raw materials for reforming. The control device 15 has a plurality of correlations C1 to C5 showing the relationship between the temperature of the adsorbent portion 42b1 and the adsorption saturation amount, which is the saturation amount of the adsorbent that can be adsorbed on the adsorbent portion 42b1, and is a predetermined component of the adsorbent. When the start-up operation for preparing the power generation of the fuel cell 34 is started with the storage unit 15a that stores the plurality of correlations C1 to C5 having different ratios, one of the plurality of correlations C1 to C5 is determined. The difference between the current saturation amount, which is the adsorption saturation amount corresponding to the current first detection temperature of the first temperature sensor 34d in one correlation, and the reference saturation amount, which is the reference adsorption saturation amount, is adsorbed. The raw material is only the adsorbable amount derived by the derivation control of the adsorbable amount derivation unit 15c and the adsorbable amount derivation unit 15c, which executes the derivation control to be derived as the adsorbable amount, which is the amount of the adsorbent that can be adsorbed by the unit 42b1. The adsorption control unit 15e that executes the adsorption control to adsorb the adsorbent to the adsorption unit 42b1 by supplying the adsorbent 42a, and the raw material pump 42a after the adsorption control is executed by the adsorption control unit 15e. Further, when the ignition control unit 15f for executing the ignition control for igniting the combustion unit 36 and the ignition control unit 15f execute the ignition control, the determination for executing the determination control for determining whether or not the combustion unit 36 is ignited is executed. When it is determined by the determination control of the control unit 15g and the determination control unit 15g that the combustion unit 36 is not ignited, the repetition control unit that executes the repeat control for repeatedly executing the derivation control, the adsorption control, the ignition control and the determination control. It is equipped with 15k. When the derivation control is executed by the repetition control of the repetition control unit 15k, the adsorptionable amount derivation unit 15c adsorbs one correlation with respect to the one correlation used in the previously executed derivation control. Select other correlations from the plurality of correlations C1 to C5 in which the current saturation amount has increased due to the difference in the ratio of the predetermined component of the quality, and derive the reference saturation amount by the derivation control executed last time. The derivation control is executed by setting the current saturation amount.

If the combustion unit 36 is not ignited even after the start-up operation is started and the derivation control, adsorption control, and ignition control are executed, the ratio of the predetermined component of the adsorbent fluctuates, so that the adsorption unit 42b1 Since the amount of adsorption is not saturated, the reforming raw material supplied from the supply source Gs is adsorbed on the adsorption portion 42b1, and the flow rate of the reforming raw material led out from the fuel cell 34 to the combustion portion 36 is insufficient. It is possible that you are doing it. On the other hand, in the fuel cell system 1 of the present embodiment, when the combustion unit 36 is not ignited, the derivation control, the adsorption control, the ignition control and the determination control are repeatedly executed by the determination control, and the derivation control is executed. Occasionally, one correlation was selected for another correlation with an increased current saturation from the one used in the previous derivation control, and the reference saturation was used in the previous derivation control. It is set to the current saturation amount. As a result, the adsorbable amount derived by the current derivation control is derived as a shortage of the current saturation amount derived by the previous derivation control with respect to the actual adsorption saturation amount of the adsorption unit 42b1. Therefore, the fuel cell system 1 can resupply the reforming raw material by the amount of the shortage of the actual adsorption saturation amount of the adsorption portion 42b1. Therefore, in the fuel cell system 1, even when the composition of the reforming raw material fluctuates, the adsorption amount of the adsorption portion 42b1 is saturated before the combustion portion 36 is ignited in the start-up operation at a relatively low cost. be able to.

The predetermined component of the adsorbent is butane.
When the raw material for reforming is LPG supplied from a gas cylinder, the proportion of butane, which is an adsorbent component, varies depending on the amount of LPG used. Therefore, even when the fuel is LPG, the adsorption amount of the adsorption portion 42b1 can be saturated at a relatively low cost.

Further, the adsorbable amount derivation unit 15c can adsorb in consideration of the amount of adsorbent adsorbed by the supply by the raw material pump 42a in the ignition control when the derivation control is executed by the repetition control of the repetition control unit 15k. Derive the quantity.

According to this, when the derivation control is executed again, the adsorbable amount can be derived by subtracting only the amount of the adsorbent adsorbed on the adsorbent portion 42b1 by the ignition control. Therefore, the adsorption amount of the adsorption portion 42b1 can be saturated at a lower cost.

Further, the control device 15 further includes an operation stop unit 15j that stops the start operation when the derivation control is executed a predetermined number of times or more by the repetition control of the repetition control unit 15k.

According to this, when the derivation control is executed more than a predetermined number of times, it is conceivable that the flow rate of the reforming raw material is insufficient, for example, due to a failure of the raw material pump 42a. In this case, since the start-up operation and the operation of the fuel cell system 1 are stopped, it is possible to confirm the abnormality of the fuel cell system 1.

Further, the fuel cell system 1 has at least an operation mode in which a start-up operation and a power generation operation in which the combustion unit 36 is burned to generate power of the fuel cell 34 and an operation mode are stopped, and the combustion unit 36 is not burned. In addition, it has a standby mode in which the fuel cell 34 is not generating power and is waiting for the start of the operation mode. When the derivation control is first executed in the current operation mode, the adsorbable amount derivation unit 15c corresponds to the reference saturation amount and the detection temperature at the stop time of the operation mode immediately before the current operation mode in one correlation. The amount of adsorption saturation to be applied.

According to this, when the derivation control is first executed in the current operation mode, the adsorbable amount derived by the derivation control is reduced as compared with the case where the reference saturation amount is set based on a relatively high temperature. It can be suppressed. Therefore, the adsorption amount of the adsorption portion 42b1 can be saturated at a lower cost.

Although an example of the fuel cell system is shown in the above-described embodiment, the present invention is not limited to this, and other configurations may be adopted. For example, in the embodiment described above.
The fuel of the fuel cell 34 is supplied from the supply source Gs, and the reforming raw material to which the odorant is added is modified. Instead, the fuel is directly supplied from the supply source Gs. Moreover, it may be used as a direct fuel to which an odorant is added. Direct fuels are natural gas and coal gas. In this case, the fuel cell system 1 is configured by omitting the reforming unit 33. Further, in this case, the raw material supply pipe 42 directly distributes the fuel, and the raw material pump 42a directly supplies the fuel from the supply source Gs. At this time, water vapor may be directly supplied to the fuel cell 34 together with the fuel directly. As described above, the fuel cell 34 is a direct fuel supplied directly from the supply source Gs and to which an odorant is added, or a reforming fuel cell supplied from the supply source Gs and to which an odorant is added. Power is generated by fuel, which is a reformed fuel whose raw material is reformed, and oxidant gas. Further, the raw material pump 42a is arranged in the raw material supply pipe 42 for directly distributing the fuel or the reforming raw material from the supply source Gs to the fuel cell 34, and directly supplies the fuel or the reforming raw material from the supply source Gs. .. The adsorbents are odorants, direct fuels and raw materials for reforming.

Further, in the above-described embodiment, the first temperature sensor 34d is arranged in the fuel cell 34, but instead of this, it may be arranged in the casing 31. Further, the first temperature sensor 34d may be arranged in the suction portion 42b1. In this case, the first temperature sensor 34d directly detects the temperature of the suction unit 42b1.

Further, in the above-described embodiment, the predetermined component is butane, but instead of this, the predetermined component may be ethane or nitrogen. In this case, even when the raw material for reforming is natural gas and the composition of the natural gas fluctuates depending on the region, for example, the adsorption unit 42b1 is adsorbed at a relatively low cost before the combustion unit 36 is ignited in the start-up operation. The amount can be saturated.

Further, in the above-described embodiment, when the derivation control is executed by the repetition control, the amount (total amount) of the reforming raw material supplied by the previous ignition control is taken into consideration, but this total amount should not be taken into consideration. You can do it. Further, when the derivation control is first executed in the current operation mode, the reference saturation amount is set by using the stop temperature T0, but instead of this, it is set to a relatively small adsorption saturation amount, for example. May be done.

Further, to the extent that the gist of the present invention is not deviated, a method for selecting one correlation and another correlation in derivation control, the positions of the temperature sensors 34d and 36b, and direct fuel or reforming in adsorption control and ignition control. The flow rate of the raw material may be changed.

1 ... Fuel cell system, 11 (30) ... Fuel cell module, 15 ... Control device, 15a ... Storage unit, 15b ... Temperature acquisition unit, 15c ... Adsorbable amount derivation unit, 15d ... Adsorption time calculation unit, 15e ... Adsorption control Unit, 15f ... Ignition control unit, 15g ... Judgment control unit, 15h ... Power generation operation start unit, 15i ... Count unit, 15j ... Operation stop unit, 15k ... Control unit, 34 ... Fuel cell, 34d ... First temperature sensor (temperature) Sensor), 36 ... combustion part, 42 ... raw material supply pipe (fuel supply pipe), 42a ... raw material pump (fuel supply device), 42b ... desulfurizer (suction device), 42b1 ... suction part, C1 to C5 ... multiple correlations relationship.

Claims (5)

Direct fuel supplied directly from the source and added with an odorant, or reformed fuel supplied from the source and modified with a reforming raw material to which the odorant is added. A fuel cell that generates electricity from the fuel and the oxidant gas,
A fuel supply device arranged in a fuel supply pipe for distributing the direct fuel or the reforming raw material from the supply source to the fuel cell and supplying the direct fuel or the reforming raw material.
A combustion unit that burns the fuel off gas and the oxidant off gas derived from the fuel cell, and
An adsorbent device arranged in the fuel supply pipe, which adsorbs adsorbents desorbably and has an adsorbent portion that changes in temperature in correlation with the temperature of the fuel cell.
A temperature sensor that detects the temperature of the adsorption part and
A fuel cell system including a control device for at least controlling the fuel cell.
The adsorbent is the odorant, the direct fuel and the reforming raw material.
The control device is
A plurality of correlations showing the relationship between the temperature of the adsorbent and the saturation amount of the adsorbate that can be adsorbed on the adsorbent, wherein the proportions of predetermined components of the adsorbent are different from each other. A storage unit that stores the correlation between
When the start-up operation for preparing the power generation of the fuel cell is started, one of the plurality of correlations is selected and corresponds to the current detection temperature of the temperature sensor in the one correlation. Derivation control that derives the difference between the current saturation amount, which is the adsorption saturation amount, and the reference saturation amount, which is the reference adsorption saturation amount, as the adsorbable amount, which is the amount of the adsorbent that can be adsorbed by the adsorption portion. With the adsorbable amount derivation unit that executes
The adsorption control unit that executes the adsorption control to adsorb the adsorbate to the adsorption unit by supplying the adsorbable amount by the fuel supply device by the adsorptionable amount derived by the derivation control of the adsorbable amount derivation unit. When,
After the adsorption control is executed by the adsorption control unit, the ignition control unit that performs the supply by the fuel supply device and executes the ignition control for igniting the combustion unit, and the ignition control unit.
When the ignition control is executed by the ignition control unit, a determination control unit that executes a determination control for determining whether or not the combustion unit has been ignited, and a determination control unit.
When it is determined by the determination control of the determination control unit that the combustion unit is not ignited, the repetition control unit that executes the repeat control for repeatedly executing the derivation control, the adsorption control, the ignition control, and the determination control. And with
The adsorbable amount derivation unit is
When the derivation control is executed by the repetition control of the repetition control unit,
The plurality of said one correlations, the present saturation amount increased due to the difference in the ratio of the predetermined component of the adsorbent with respect to the one correlation used in the derivation control executed last time. Select other correlations from the above correlations, and
A fuel cell system that executes the derivation control by setting the reference saturation amount to the current saturation amount derived by the derivation control executed last time. The fuel cell system according to claim 1, wherein the predetermined component of the adsorbent is butane. The adsorbable amount derivation unit is
When the derivation control is executed by the repetition control of the repetition control unit,
The fuel cell system according to claim 1 or 2, wherein the adsorbable amount is derived in consideration of the amount of the adsorbent adsorbed by the supply by the fuel supply device in the ignition control. The control device is
The invention according to any one of claims 1 to 3, further comprising an operation stop unit for stopping the start operation when the derivation control is executed a predetermined number of times or more by the repeat control of the repeat control unit. Fuel cell system. The operation mode in which at least the start-up operation and the power generation operation in which the combustion of the combustion unit is performed to generate the power of the fuel cell and the operation mode are stopped, the combustion of the combustion unit is not performed, and the fuel cell is not burned. It has a standby mode in which power is not generated and is waiting for the start of the operation mode.
The adsorbable amount derivation unit is
When the derivation control is first executed in the current operation mode,
Any of claims 1 to 4, wherein the reference saturation amount is the adsorption saturation amount corresponding to the detected temperature at the time when the operation mode is stopped immediately before the current operation mode in the one correlation. The fuel cell system described in the first paragraph.

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