JP2012227065A - Fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell system that can quickly increase the temperature of a fuel cell while safely operating a fuel cell module.SOLUTION: The fuel cell system includes: a fuel cell module 5 capable of passing air on an air electrode side of the fuel cell and passing a fuel gas on a fuel electrode side of the fuel cell to generate power; an air supply device 6 for supplying the air to the fuel cell module 5; a fuel supply device 7 for supplying the fuel gas to the fuel cell module 5; a combustion fuel supply device 8 for supplying a combustion fuel gas to an air supply passage R1 extending from the air supply device 6 to the fuel cell module 5; a flow regulating valve 32 capable of regulating the supply flow rate of the combustion fuel gas supplied to the air supply passage R1; and a control device 9 capable of controlling the flow regulating valve 32 to regulate the supply flow rate during temperature rise control of increasing the temperature of the fuel cell.

Description

  The present invention relates to a fuel cell system equipped with a solid oxide fuel cell module.

  Conventionally, as a fuel cell module mounted on such a fuel cell system, one having a cylindrical fuel cell tube with a fuel cell formed on its surface is known (see, for example, Patent Document 1). . In this fuel cell module, at the time of starting the fuel cell module, the fuel gas is introduced inside the fuel cell tube, and the oxidant gas and the temperature raising fuel gas are burned outside the fuel cell tube. Introduce combustion gas. Thus, the fuel cell module can quickly raise the temperature of the fuel cell when the fuel cell module is activated.

JP 2007-109598 A

  By the way, the fuel cell module has various design constraints in operation. For this reason, it is difficult to safely operate the fuel cell module when the temperature of the fuel cell is increased only by flowing the combustion gas to the outside of the fuel cell tube as in the conventional fuel cell module.

  Then, this invention makes it a subject to provide the fuel cell system which can temperature-rise a fuel cell rapidly while performing operation | movement of a fuel cell module safely.

  The fuel cell system of the present invention has a fuel cell comprising an electrolyte, an air electrode formed on one side of the electrolyte, and a fuel electrode formed on the other side of the electrolyte, and an oxidant gas on the air electrode side. A fuel cell module capable of generating electricity by flowing fuel gas to the fuel electrode side, oxidant supply means for supplying oxidant gas to the fuel cell module, and fuel gas to the fuel cell module Fuel supply means for supply, combustion fuel supply means for supplying combustion fuel gas to the oxidant supply flow path from the oxidant supply means to the fuel cell module, and combustion fuel gas supplied to the oxidant supply flow path A flow rate adjusting means capable of adjusting the supply flow rate of the fuel cell, and a control means capable of adjusting the supply flow rate of the fuel gas for combustion by controlling the flow rate adjusting means during the temperature rise control for increasing the temperature of the fuel cell. And said that there were pictures.

  According to this configuration, the control means can adjust the supply flow rate of the combustion fuel gas supplied to the oxidant supply flow path by controlling the flow rate adjustment means during the temperature rise control. For this reason, the control means can execute the temperature rise control in consideration of the safety of the fuel cell module. Thereby, the control means can rapidly raise the temperature of the fuel cell while safely operating the fuel cell module.

  In this case, it is preferable that the control unit controls the flow rate adjusting unit so that the supply flow rate is equal to or lower than a preset limit flow rate.

  According to this configuration, the control unit can ensure the safety of the fuel cell module because the supply flow rate can be made lower than the limit flow rate.

  In this case, the restricted flow rate is preferably a first lower limit flow rate that is a flow rate at which the combustion fuel gas cannot explode.

  According to this configuration, the control means can reduce the supply flow rate to the first lower limit flow rate or less, and therefore supply the combustion fuel gas toward the air electrode of the fuel cell without exploding the combustion fuel gas. can do. Thereby, the control means can further improve the safety of the fuel cell module.

  In this case, the limited flow rate is preferably a second lower limit flow rate that is a flow rate such that the unburned combustion fuel gas mixed in the oxidant gas discharged from the fuel cell module does not exceed a predetermined allowable amount. .

  According to this configuration, the control means can reduce the supply flow rate to the second lower limit flow rate or less, so that the unburned combustion fuel gas mixed in the discharged oxidant gas does not exceed the allowable amount. The combustion fuel gas can be supplied toward the air electrode of the fuel battery cell. Thereby, the control means can suppress the influence which the fuel gas for combustion of unburned mixes when using oxidizing agent gas discharged | emitted from a fuel cell module.

  In this case, the restricted flow rate is preferably a third lower limit flow rate that is a flow rate such that the temperature in the constituent members other than the fuel cell of the fuel cell module is equal to or lower than a predetermined temperature.

  According to this configuration, the control means can reduce the supply flow rate to the third lower limit flow rate or less, so that the combustion fuel gas is supplied to the catalyst so that the temperature of the constituent members of the fuel cell module is equal to or lower than the predetermined temperature. It can be supplied toward the air electrode. Thereby, since the control means can suppress the deterioration of the structural member due to the thermal influence, the safety of the fuel cell module can be further enhanced.

  In this case, it is preferable that the limiting flow rate is a fourth lower limit flow rate that is a flow rate at which the oxygen concentration in the oxidant gas consumed at the air electrode is not deficient.

  According to this configuration, the control means can reduce the supply flow rate to the fourth lower limit flow rate or less, so that oxygen is consumed by combustion of the combustion fuel gas, and oxygen is deficient in the air electrode of the fuel cell. This can be suppressed. For this reason, the possibility of damage to the air electrode due to oxygen deficiency can be reduced. Thereby, the control means can further improve the safety of the fuel cell module.

  In this case, the fuel cell module performs a start-up operation for raising the fuel cell to a predetermined temperature, and then performs a power generation operation for generating power from the fuel cell, and the restriction flow rate is such that the combustion fuel gas cannot explode. A first lower limit flow rate that is a flow rate, a second lower limit flow rate that is a flow rate such that the unburned combustion fuel gas mixed in the oxidant gas discharged from the fuel cell module does not exceed a predetermined allowable amount, and fuel The third lower limit flow rate, which is a flow rate at which the temperature of the constituent members other than the fuel battery cells of the battery module is equal to or lower than a predetermined temperature, and the oxygen concentration at which oxygen in the oxidizing gas consumed at the air electrode is not deficient. The control means has a minimum flow rate among the first lower limit flow rate, the second lower limit flow rate, and the third lower limit flow rate at the start-up operation of the fuel cell module. Set shall as limiting flow, during the power generation operation of the fuel cell module, it is preferable to set the fourth lower flow rate of limited flow rate.

  According to this configuration, the control means can reduce the supply flow rate to the first lower limit flow rate, the second lower limit flow rate, and the third lower limit flow rate or less, thereby further improving the safety during the start-up operation of the fuel cell module. Can do. In addition, since the control unit can set the supply flow rate to be equal to or lower than the fourth lower limit flow rate, the safety during the power generation operation of the fuel cell module can be further improved.

  In this case, it is preferable that the control means increase the supply flow rate when the supply flow rate is smaller than the limited flow rate.

  According to this configuration, since the control unit can increase the supply flow rate to near the limit flow rate, the temperature of the fuel cell can be further rapidly increased while ensuring the safety of the fuel cell module.

  In this case, it is preferable that the control means starts supplying the combustion fuel gas when satisfying a preset supply condition.

  According to this configuration, the control means does not supply the combustion fuel gas until the supply condition is satisfied, and starts supplying the combustion fuel gas when the predetermined supply condition is satisfied. For this reason, the control means can start the supply of the combustion fuel gas under an appropriate condition by setting the supply condition to be an optimum condition for the supply of the combustion fuel gas.

  In this case, the supply conditions are set in advance so that the temperature of the fuel cell becomes a temperature at which the combustion fuel gas can be ignited, and the flow rate of the oxidant gas supplied to the fuel cell module A second supply condition that provides a set flow rate, and a third supply condition in which the temperature in the oxidant supply flow path after the combustion fuel gas merges becomes a temperature at which the combustion fuel gas cannot be ignited; When all the supply conditions are satisfied, it is preferable to start supplying the combustion fuel gas.

  According to this configuration, the control means can start supplying the combustion fuel gas in a state where all of the first supply condition, the second supply condition, and the third supply condition are satisfied. That is, the control means can be supplied to the air electrode of the fuel cell without igniting the combustion fuel gas in the oxidant supply flow path, and can supply the oxidant gas together with the combustion fuel gas. The combustion fuel gas can be ignited by circulating it through the air electrode of the fuel cell. For this reason, the control means can suitably ignite the combustion fuel gas by catalytic action.

  In this case, the control means supplies a predetermined amount of the combustion fuel gas after the start of the supply of the combustion fuel gas, and adjusts the supply flow rate of the combustion fuel gas after a predetermined period from the start of the supply. It is preferable.

  According to this configuration, the control means adjusts the supply flow rate of the combustion fuel gas after supplying a certain amount of combustion fuel gas for a predetermined period of time, so that the temperature of the fuel cell at the time of temperature rise control is controlled. Response delay can be reduced.

  In this case, the control means preferably stops the supply of the combustion fuel gas when satisfying a preset supply stop condition.

  According to this configuration, the control means stops the supply of the combustion fuel gas when the supply stop condition is satisfied. For this reason, the control means makes it possible to stop the supply of the combustion fuel gas under an appropriate condition by setting the supply stop condition to be a condition not suitable for the supply of the combustion fuel gas.

  In this case, the supply stop condition is the first supply stop condition in which the temperature in the constituent members other than the fuel cell of the fuel cell module is higher than the preset upper limit temperature, and after the combustion fuel gas is joined The second supply stop condition, which is a condition for igniting the combustion fuel gas, and the third supply stop condition, which is a condition for the temperature of the fuel cell to be higher than a preset upper limit temperature, Difference between the fourth supply stop condition, which is a condition that the supply flow rate is higher than a preset limit flow rate, the temperature of the fuel cell, and the control temperature of the fuel cell set in the temperature rise control Has a fifth supply stop condition that is a condition that is greater than a preset temperature difference, and a sixth supply stop condition that is a condition that the temperature increase control is not executed, and the control means includes at least Izu It is satisfied if one supply stop condition, it is preferable to stop the supply of the combustion fuel gas.

  According to this configuration, the control unit can stop the supply of the combustion fuel gas under an appropriate supply stop condition. Thereby, the control means can further improve the safety of the fuel cell module.

  In this case, the control means sets the control temperature setting means for setting the control temperature of the fuel cell, which is a target in the temperature rise control, and the temperature difference between the temperature of the fuel battery cell and the control temperature. It is preferable to have a control flow rate setting unit that sets the control flow rate, and a flow rate control unit that controls the flow rate adjustment unit based on a deviation between the supply flow rate and the control flow rate.

  According to this configuration, the control unit can indirectly perform the temperature increase control of the fuel cell by controlling the flow rate adjusting unit by the flow rate control unit based on the deviation between the supply flow rate and the control flow rate. it can.

  In this case, the control means controls the flow rate adjusting means based on the temperature difference between the control temperature setting means for setting the control temperature of the fuel cell that is the target in the temperature rise control and the temperature of the fuel battery cell. It is preferable to have a flow rate control means.

  According to this configuration, the control unit directly controls the temperature increase of the fuel cell by controlling the flow rate adjusting unit by the flow rate control unit based on the temperature difference between the temperature of the fuel cell and the control temperature. Can be executed.

  According to the fuel cell system of the present invention, it is possible to quickly raise the temperature of the fuel cell while safely operating the fuel cell module.

FIG. 1 is a schematic configuration diagram schematically showing the fuel cell system of the first embodiment. FIG. 2 is a schematic configuration diagram schematically showing the fuel cell module. FIG. 3 is a schematic configuration diagram schematically showing the cell tube. FIG. 4 is a block diagram showing the control device. FIG. 5 is a graph of the control temperature that changes over time. FIG. 6 is a graph of the first lower limit flow rate that varies depending on the actual temperature of the fuel cell. FIG. 7 is a graph of the control temperature that changes according to the current value of the fuel cell module. FIG. 8 is a block diagram illustrating a control device according to the first modification. FIG. 9 is a schematic configuration diagram schematically illustrating the fuel cell system according to the second embodiment. FIG. 10 is a graph of an example of the control temperature that changes with the passage of time. FIG. 11 is a graph of an example of the control temperature that changes over time.

  Hereinafter, a fuel cell system according to the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the following examples. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  The fuel cell system according to Example 1 includes a solid oxide fuel cell module, a so-called SOFC (Solid Oxide Fuel Cell), and operates while controlling the fuel cell module. Hereinafter, the fuel cell system will be described with reference to FIG.

  FIG. 1 is a schematic configuration diagram schematically showing the fuel cell system of the first embodiment. As shown in FIG. 1, a fuel cell system 1 includes a fuel cell module 5, an air supply device (oxidant supply means) 6 that supplies air (oxidant gas), and a fuel supply device 7 that supplies fuel gas. A combustion fuel supply device 8 for supplying combustion fuel gas and a control device 9 are provided.

  FIG. 2 is a schematic configuration diagram schematically illustrating the fuel cell module according to the first embodiment. As shown in FIG. 2, the fuel cell module 5 includes a casing 201, a plurality of cell tubes 202 formed in a substantially cylindrical shape, an upper tube plate 203a and a lower tube plate 203b that support both ends of the cell tube 202, It is comprised from the upper heat insulating body 204a arrange | positioned between these upper and lower tube sheets 203a, 203b, and the lower heat insulating body 204b.

  The casing 201 includes a case 201a, and an upper case 201b and a lower case 201c provided at both ends of the case 201a, and the cell tube 202 is accommodated in the internal space thereof.

  FIG. 3 is a schematic configuration diagram schematically showing the cell tube. As shown in FIG. 3, the cell tube 202 includes a base tube 101 having a cylindrical shape, and a fuel cell 210 serving as a power generation element provided on the outer peripheral surface of the base tube 101. The base tube 101 is a porous ceramic cylindrical tube through which fuel gas flows. Since the base tube 101 is porous, the fuel gas flowing inside is guided to the outer peripheral surface side of the base tube 101. The fuel cell 210 is configured by laminating a fuel electrode 103, a solid electrolyte 104, and an air electrode 105, and the fuel electrode 103 and the air electrode 105 are provided on both sides of the solid electrolyte 104. The air electrode 105 contains an active metal, and the air electrode 105 has a function (combustion by catalytic action) that contributes to a combustion reaction by the active metal contained. In the fuel cell 210, the fuel electrode 103 is in contact with the outer peripheral surface of the base tube 101, and a plurality of fuel cells are arranged in the axial direction of the base tube 101. In the plurality of fuel cells 210, the fuel electrode 103 of one adjacent fuel cell 210 and the air electrode 105 of the other adjacent fuel cell 210 are connected by an interconnector 106. The fuel cell 210 configured as described above generates power at a high temperature of, for example, 800 ° C. to 950 ° C. during the power generation operation of the fuel cell system 1.

  The upper tube plate 203a is a plate-like member arranged on one side (upper side) of the casing 201 in the axial direction, and the lower tube plate 203b is a plate-like member arranged on the other side (lower side) of the casing 201 in the axial direction. It is a member. A fuel supply chamber 206 is formed in the space defined by the upper case 201b and the upper tube plate 203a of the casing 201, and the space defined by the lower case 201c and the lower tube plate 203b of the casing 201 is formed. A fuel discharge chamber 207 is formed. For this reason, one open end of the cell tube 202 is connected to the fuel supply chamber 206, and the other open end of the cell tube 202 is connected to the fuel discharge chamber 207. It is supported by the tube plate 203a and the lower tube plate 203b.

  The upper heat insulator 204a is disposed on one side (upper side) of the casing 201 in the axial direction, and is formed in a blanket shape or a board shape using a heat insulating material. The lower heat insulator 204b is disposed on the other axial side (lower side) of the casing 201, and is formed in a blanket shape or a board shape using a heat insulating material. Each of the heat insulators 204a and 204b is formed with holes 211a and 211b through which the cell tube 202 is inserted, and the diameters of the holes 211a and 211b are larger than the diameter of the cell tube 202. A power generation chamber 205 is formed in a space between the upper heat insulator 204a and the lower heat insulator 204b. An air supply chamber 208 is formed between the lower tube plate 203b and the lower heat insulator 204b, and an air discharge chamber 209 is formed between the upper tube plate 203a and the upper heat insulator 204a. Yes. At this time, the fuel cell 210 of the cell tube 202 is disposed so as to be located only in the power generation chamber 205.

  Here, the operation of the fuel cell module 5 configured as described above will be described. The fuel cell module 5 performs a start-up operation for raising the fuel cell 210 to a predetermined temperature, and then performs a power generation operation for generating power in the fuel cell 210. When the fuel cell module 5 performs a power generation operation, air flows into the air supply chamber 208 of the fuel cell module 5. The air is supplied into the power generation chamber 205 through a gap between the hole 211 b of the lower heat insulating material 204 b and the cell tube 202. On the other hand, fuel gas flows into the fuel supply chamber 206. The fuel gas is supplied into the power generation chamber 205 through the inside of the base tube 101 of the cell tube 202. At this time, the air and the fuel gas flow in opposite directions on the inner peripheral surface and the outer peripheral surface of the cell tube 202.

  The fuel gas flowing inside the base tube 101 passes through the pores of the base tube 101 and reaches the fuel electrode 103. This fuel gas is steam reformed by the active metal contained in the fuel electrode 103. Hydrogen produced by steam reforming passes through the pores of the fuel electrode 103 and reaches the solid electrolyte 104. On the other hand, the air flows outside the base tube 101 (air electrode 105). The oxygen in the air ionizes while passing through the pores of the air electrode 105 or reaches the solid electrolyte 104. The ionized oxygen passes through the solid electrolyte 104 and reaches the fuel electrode 103. The oxygen ions that have passed through the solid electrolyte 104 react with the fuel gas. The fuel cell module 5 generates electric power by the potential difference caused by such a cell reaction.

  Then, in the power generation chamber 205, the fuel gas that has been used for power generation and has reached a high temperature is heat-exchanged with air before being used for power generation in the air supply chamber 208. In the power generation chamber 205, the air that has been used for power generation and becomes high temperature is heat-exchanged with the fuel gas before being used for power generation in the air discharge chamber 209.

  Thereafter, after the fuel gas and air used for power generation are cooled by heat exchange, the fuel gas flows into the fuel discharge chamber 207 and is discharged from the fuel discharge chamber 207 to the outside of the fuel cell module 5. The air is discharged from the air discharge chamber 209 to the outside of the fuel cell module 5.

  Referring again to FIG. 1, the air supply device 6 supplies air toward the air supply chamber 208. The air supply device 6 and the air supply chamber 208 are connected by an air supply flow path R1, and an air flow meter 30 for measuring the flow rate of the circulating air is provided in the air supply flow path R1. .

  The fuel supply device 7 supplies fuel gas toward the fuel supply chamber 206. The fuel supply device 7 and the fuel supply chamber 206 are connected by a fuel supply flow path R2.

  The combustion fuel supply device 8 supplies combustion fuel gas toward the air supply flow path R1. The combustion fuel gas is the same as the fuel gas. The combustion fuel supply device 8 and the air supply flow path R1 are connected by a combustion fuel gas supply flow path R3. The combustion fuel gas supply flow path R3 is provided with a combustion fuel gas flow meter 31 for measuring the flow rate of the flowing air, and a flow rate adjusting valve 32 is provided upstream of the combustion fuel gas flow meter 31. . The flow rate adjusting valve 32 is connected to the control device 9, and the control device 9 controls the flow rate adjusting valve 32 to adjust the flow rate of the combustion fuel gas to be supplied.

  Further, the fuel cell system 1 includes an ammeter 40 that measures the current value of the fuel cell module 5, a first temperature sensor 41 and a second temperature sensor 2 that are provided in the air supply flow path R 1, and the fuel cell module 5. A third temperature sensor 43 provided in the power generation chamber 205 and a fourth temperature sensor 44 provided in the upper case 201b of the fuel cell module 5 are provided.

  The ammeter 40 measures the current obtained by the power generation of the fuel cell module 5. The first temperature sensor 41 is provided on the upstream side of the merging portion of the combustion fuel gas supply flow path R3 connected to the air supply flow path R1. For this reason, the 1st temperature sensor 41 can measure the temperature of the air which flows through air supply flow path R1. The second temperature sensor 42 is provided on the downstream side of the joining portion of the combustion fuel gas supply flow path R3 connected to the air supply flow path R1. For this reason, the second temperature sensor 42 can measure the temperature of the air and the combustion fuel gas mixed on the downstream side of the air supply flow path R1.

  The third temperature sensor 43 can measure the temperature of the power generation chamber 205 of the fuel cell module 5. The fourth temperature sensor 44 can measure the temperature of the upper case (component member) 201b of the fuel cell module 5. Note that the fourth temperature sensor 44 may be a constituent member other than the fuel cell 210 of the fuel cell module 5, and thus may be another constituent member, not limited to the upper case 201b. The control device 9 is connected to the air flow meter 30, the combustion fuel gas flow meter 31, the ammeter 40, and the temperature sensors 41, 42, 43, 44.

  The control device 9 performs control during start-up operation of the fuel cell module 5 and performs control during power generation operation of the fuel cell module 5. Here, the control device 9 executes, for example, temperature increase control of the fuel cell module 5 as control during the startup operation of the fuel cell module 5. The temperature increase control is a control for increasing the temperature of the fuel cell 210 in order to increase the power generation efficiency of the fuel cell module 5. Hereinafter, the control device 9 will be described with reference to FIG.

  FIG. 4 is a block diagram showing the control device. When executing the temperature increase control, the control device 9 controls the flow rate adjustment valve 32 to adjust the flow rate of the combustion fuel gas supplied to the air supply flow path R1. As shown in FIG. 4, the control device 9 includes a control temperature setting unit 51, a control flow rate setting unit 52, a flow rate restriction unit 53, and a flow rate control unit 54.

  FIG. 5 is a graph of the control temperature that changes over time. In the graph of FIG. 5, the vertical axis represents the control temperature, and the horizontal axis represents time. As shown in FIG. 5, the control temperature setting unit 51 sets the control temperature of the fuel cell 210 based on a temperature change rate that represents a change in temperature per unit time. This temperature change rate is set in advance based on experiments and the like. The control temperature is a control value for controlling the actual temperature of the fuel cell 210, and the control device 9 raises the temperature of the fuel cell 210 with the set control temperature as a target. The control temperature setting unit 51 sets the control temperature to the same temperature as the actual temperature of the fuel cell 210 at the start of the start-up operation of the fuel cell module 5, and thereafter, based on a preset temperature change rate. To increase the control temperature.

  The control flow rate setting unit 52 sets the control flow rate of the combustion fuel gas based on the temperature difference between the actual temperature of the fuel battery cell 210 and the control temperature. The control flow rate is a control value for controlling the supply flow rate of the combustion fuel gas, and the control device 9 adjusts the supply flow rate of the combustion fuel gas with the set control flow rate as a target. The control flow rate setting unit 52 acquires the detected temperature obtained from the third temperature sensor 43 as the actual temperature of the fuel cell 210.

  The flow restriction unit 53 sets the supply flow rate of the combustion fuel gas to be equal to or less than the restriction flow, and the restriction flow includes a first lower limit flow, a second lower limit flow, and a third lower limit flow. Here, FIG. 6 is a graph of the first lower limit flow rate that changes in accordance with the actual temperature of the fuel cell. The first lower limit flow rate is a flow rate at which the combustion fuel gas cannot explode. The first lower limit flow rate is a flow rate calculated by a calculation formula expressed by “flow rate of air supplied from the air supply device 6 × lower explosion limit of combustion fuel gas × safety factor”. As shown in FIG. 6, the first lower limit flow rate decreases as the detected temperature obtained from the third temperature sensor 43 increases. The dotted line in FIG. 6 is the first lower limit temperature when the safety factor is not considered (not multiplied), and the solid line is the first lower limit temperature when the safety factor is considered (multiplied).

  The second lower limit flow rate is a flow rate such that the unburned combustion fuel gas mixed in the air discharged from the air discharge chamber 209 of the fuel cell module 5 does not exceed a predetermined allowable amount. Here, a device such as a gas turbine that is operated by discharged air may be connected to the downstream side of the air discharge chamber 209 of the fuel cell module 5. In this case, the second lower limit flow rate is a flow rate calculated by a calculation formula represented by “flow rate of unburned combustion fuel gas accepted by the device / (1−combustion rate)”. The combustion rate is expressed by “combustion amount of combustion fuel gas / input amount of combustion fuel gas”.

  The third lower limit flow rate is a flow rate such that the temperature of the upper case 201b (component) of the fuel cell module 5 detected by the fourth temperature sensor 44 is equal to or lower than a predetermined temperature.

  When the control flow rate set by the control flow rate setting unit 52 is equal to or lower than the limit flow rate, the flow rate limiting unit 53 sets the control flow rate as the control flow rate, while the control flow rate set by the control flow rate setting unit 52 sets the limit flow rate. If it exceeds, the limit flow rate is set as the control flow rate.

  The flow rate control unit 54 adjusts the flow rate of the combustion fuel gas by controlling the flow rate adjustment valve 32 based on the deviation between the supply flow rate of the combustion fuel gas and the control flow rate.

  Next, a series of control operations for executing the temperature rise control by the control device 9 during the startup operation of the fuel cell system 1 will be described. When the start-up operation of the fuel cell system 1 is started, the control device 9 determines whether or not the combustion fuel gas satisfies a preset supply condition. Here, as supply conditions, there are a first supply condition, a second supply condition, and a third supply condition, and supply of combustion fuel gas is started when all of these supply conditions are satisfied.

  The first supply condition is a condition in which the temperature of the fuel battery cell 210 is a temperature at which the combustion fuel gas can be ignited. That is, the control device 9 determines that the first supply condition is satisfied when the temperature detected by the third temperature sensor 43 reaches a temperature at which the combustion fuel gas can be burned by the catalytic action of the fuel cell 210.

  The second supply condition is a condition in which the flow rate of air supplied toward the fuel cell module 5 becomes a preset flow rate. The set flow rate is a flow rate at which air flows through the air supply flow path R1, and may be larger than zero. For this reason, if the detected flow rate of the air flow meter 30 is larger than 0, the control device 9 determines that the second supply condition is satisfied.

  The third supply condition is a condition in which the temperature in the air supply flow path R1 after the combustion fuel gas merges becomes a temperature at which the combustion fuel gas cannot be ignited. That is, the control device 9 determines that the third supply condition is satisfied when the temperature detected by the second temperature sensor 42 is a temperature at which the combustion fuel gas does not ignite.

  And if all the supply conditions are satisfy | filled, the control apparatus 9 will perform opening control of the flow regulating valve 32, supply the fuel gas for combustion, and start execution of temperature rising control. On the other hand, the control device 9 does not supply the combustion fuel gas by closing the flow rate adjusting valve 32 unless all the supply conditions are satisfied.

  When the flow rate adjustment valve 32 is controlled to open and the temperature rise control is executed, the control device 9 sets the control temperature as shown in FIG. 5 in the control temperature setting unit 51 based on the temperature change rate. . In the control flow rate setting unit 52, the control device 9 sets the control flow rate based on the temperature difference between the set control temperature and the detected temperature of the third temperature sensor 43 (actual temperature of the fuel cell 210). The control device 9 sets, in the flow rate limiting unit 53, the minimum flow rate among the set control flow rate and the preset limited flow rate as the control flow rate. Then, the controller 9 controls the flow rate adjusting valve 32 based on the deviation between the set control flow rate and the detected flow rate (combustion fuel gas supply flow rate) of the combustion fuel gas flow meter 31 in the flow rate control unit 54. Adjust.

  When the control temperature is set by the control temperature setting unit 51, if the control flow rate set in the control flow rate setting unit 52 is smaller than the limit flow rate set in the flow rate limiting unit 53, the control flow rate becomes the limit flow rate. The temperature change rate may be changed to the temperature rising side within a range not exceeding (dotted line in FIG. 5).

  When the temperature detected by the third temperature sensor 43 reaches a temperature at which the fuel cell 210 can generate power, the fuel cell system 1 shifts from the startup operation of the fuel cell module 5 to the power generation operation, and the control device 9 Control during power generation operation is executed. Here, the control device 9 performs the temperature increase control even during the power generation operation. Next, temperature increase control during the power generation operation of the fuel cell module 5 will be described.

  The control temperature setting unit 51 sets the control temperature as shown in FIG. 5 based on the rate of temperature change during the start-up operation of the fuel cell module 5, but during the power generation operation of the fuel cell module 5, the control temperature setting unit 51 sets the control temperature as shown in FIG. The control temperature is set based on the graph shown in FIG. Here, FIG. 7 is a graph of the control temperature that changes according to the current value of the fuel cell module. In the graph of FIG. 7, the vertical axis represents the control temperature, and the horizontal axis represents the current value obtained when the fuel cell module generates power. As shown in this graph, the control device 9 sets the control temperature based on the current value of the fuel cell module 5, that is, the current value detected by the ammeter 40.

  The control flow rate setting unit 52 sets the control flow rate of the combustion fuel gas based on the temperature difference between the temperature detected by the third temperature sensor 43 and the control temperature set by the control temperature setting unit 51.

  The flow rate restriction unit 53 sets the control flow rate to be equal to or lower than the restriction flow rate even during the power generation operation of the fuel cell module 5. There is a fourth lower limit flow rate as the limited flow rate. The fourth lower limit flow rate is a flow rate at which the oxygen concentration is such that oxygen in the air consumed at the air electrode is not deficient. That is, during the power generation operation, the amount of oxygen in the air consumed by the cell reaction is determined by the current value of the fuel cell module 5. For this reason, when the current value is measured by the ammeter 40, the remaining oxygen amount after subtracting the oxygen amount in the air consumed by the cell reaction becomes the oxygen amount that can be used for the combustion fuel gas. Accordingly, the fourth lower limit flow rate of the combustion fuel gas can be set based on the amount of oxygen that can be used for the combustion fuel gas.

  Next, a series of control operations for executing the temperature rise control by the control device 9 during the power generation operation of the fuel cell system 1 will be described. When the control device 9 shifts to the power generation operation of the fuel cell system 1, the control temperature setting unit 51 sets the control temperature based on the graph shown in FIG. 7 from the current value of the ammeter provided in the fuel cell module 5. . In the control flow rate setting unit 52, the control device 9 sets the control flow rate based on the temperature difference between the set control temperature and the detected temperature of the third temperature sensor 43. The control device 9 sets, in the flow rate limiting unit 53, the minimum flow rate among the set control flow rate and the fourth lower limit flow rate as the control flow rate. Then, the control device 9 adjusts the flow rate adjustment valve 32 in the flow rate control unit 54 based on the deviation between the set control flow rate and the detected flow rate of the combustion fuel gas flow meter 31.

  Further, during the start-up operation or the power generation operation of the fuel cell module 5, the control device 9 determines whether or not a preset condition for stopping the supply of combustion fuel gas is satisfied. Here, the supply stop condition includes at least one of a first supply stop condition, a second supply stop condition, a third supply stop condition, a fourth supply stop condition, a fifth supply stop condition, and a sixth supply stop condition. By satisfying one supply stop condition, the supply of combustion fuel gas is stopped.

  Here, the first supply stop condition is a condition in which the temperature of the upper case 201b which is a constituent member other than the fuel cell 210 of the fuel cell module 5 is higher than a preset upper limit temperature. Specifically, the first supply stop condition is a condition in which the temperature detected by the fourth temperature sensor 44 is higher than the upper limit temperature of the upper case 201b. The second supply stop condition is a condition in which the combustion fuel gas is ignited in the air supply flow path R1 after the combustion fuel gas is merged. Specifically, the second supply stop condition is a condition in which the temperature difference of the detected temperature of the second temperature sensor 42 with respect to the detected temperature of the first temperature sensor 41 becomes a predetermined temperature difference that the combustion fuel gas is considered to have ignited. It is. In the second supply stop condition, instead of the temperature difference described above, the rate of change per unit time of the temperature detected by the second temperature sensor 42 is a predetermined rate of change at which the combustion fuel gas is regarded as ignited. It may be a condition.

  The third supply stop condition is a condition in which the temperature of the fuel battery cell 210 is higher than a preset upper limit temperature. Specifically, the third supply stop condition is a condition in which the temperature detected by the third temperature sensor 43 is higher than the upper limit temperature of the fuel cell 210. The fourth supply stop condition is a condition in which the supply flow rate of the combustion fuel gas is larger than a preset limit flow rate. Specifically, the fourth supply stop condition is a condition in which the supply flow rate of the combustion fuel gas is larger than the first lower limit flow rate, the second lower limit flow rate, the third lower limit flow rate, and the fourth lower limit flow rate.

  The fifth supply stop condition is a condition in which a temperature difference between the temperature of the fuel battery cell 210 and a control temperature lower than the temperature of the fuel battery cell 210 is larger than a preset temperature difference. Specifically, the fifth supply stop condition is that the temperature difference between the temperature detected by the third temperature sensor 43 and the control temperature set by the control temperature setting unit 51 is larger than the set temperature difference at which temperature control is disabled. This is a condition. The sixth supply stop condition is a condition in which the temperature increase control is not executed. Specifically, the sixth supply stop condition is a condition in which the control device 9 ends the temperature increase control or a condition in which the control device 9 does not execute the temperature increase control.

  When at least one of the supply stop conditions is satisfied, the control device 9 controls the flow rate adjustment valve 32 to close and stops the supply of the combustion fuel gas. On the other hand, if the supply stop condition is not satisfied, the control device 9 controls to open the flow rate adjustment valve 32 and supplies the combustion fuel gas.

  As described above, according to the configuration of the first embodiment, the control device 9 controls the flow rate adjustment valve 32 during the temperature rise control to control the supply flow rate of the combustion fuel gas supplied to the air supply flow path R1. Can be adjusted. For this reason, the control device 9 can execute the temperature increase control in consideration of the safety of the fuel cell module 5. As a result, the control device 9 can quickly raise the temperature of the fuel cell 210 while safely operating the fuel cell module 5.

  Further, according to the configuration of the first embodiment, the control device 9 can set the supply flow rate of the combustion fuel gas to be equal to or less than a preset limit flow rate by the flow rate limiting unit 53. Specifically, since the control device 9 can reduce the supply flow rate of the fuel gas for combustion to the first lower limit flow rate, the second lower limit flow rate, and the third lower limit flow rate during the startup operation of the fuel cell module 5, The safety of the fuel cell module 5 can be improved. In addition, the control device 9 can improve the safety of the fuel cell module 5 because the supply flow rate of the combustion fuel gas can be set to the fourth lower limit flow rate or less during the power generation operation of the fuel cell module 5. it can.

  Further, according to the configuration of the first embodiment, when the supply flow rate is smaller than the limit flow rate, the control device 9 changes the temperature change rate to the temperature rising side within a range where the control flow rate does not exceed the limit flow rate. Thus, the supply flow rate can be increased. Thus, the control device 9 can increase the temperature of the fuel cell 210 more quickly while ensuring the safety of the fuel cell module 5 in the fuel cell system 1.

  Further, according to the configuration of the first embodiment, the control device 9 does not supply the combustion fuel gas until the supply condition is satisfied, and supplies the combustion fuel gas when the predetermined supply condition is satisfied. Can start. Specifically, the control device 9 starts the supply of the combustion fuel gas in a state where all of the first supply condition, the second supply condition, and the third supply condition are satisfied, so that the safety of the fuel cell module 5 is improved. It is possible to start supplying the fuel gas for combustion under appropriate conditions.

  Further, according to the configuration of the first embodiment, the control device 9 can stop the supply of the combustion fuel gas when the supply stop condition is satisfied. Specifically, the control device 9 stops the supply of the fuel gas for combustion when satisfying at least one of the first supply stop condition to the sixth supply stop condition, thereby stopping the fuel cell module 5. Can be secured.

  In Example 1, the control device 9 adjusts the supply flow rate of the combustion fuel gas after starting the supply of the combustion fuel gas. However, the present invention is not limited to this configuration, and after the start of the supply of the combustion fuel gas, A predetermined amount of combustion fuel gas set in advance may be supplied, and the supply flow rate of the combustion fuel gas may be adjusted after a lapse of a predetermined period from the start of supply. According to this configuration, the control device 9 can reduce the response delay of the temperature of the fuel cell 210 during the temperature rise control.

  Moreover, in Example 1, although the control apparatus 9 was set as the structure shown in FIG. 4, it is good not only as this but as a modification shown in FIG. FIG. 8 is a block diagram illustrating a control device according to the first modification. Specifically, the control device 9 of Modification 1 has a configuration in which the control flow rate setting unit 52 is eliminated, and the temperature between the control temperature set by the control temperature setting unit 51 and the detected temperature of the third temperature sensor 43. Based on the difference, the flow rate control unit 54 controls the flow rate adjustment valve 32. According to this configuration, the control device 9 controls the flow rate adjustment valve 32 by the flow rate control unit 54 based on the temperature difference between the temperature of the fuel cell 210 and the control temperature, thereby increasing the temperature of the fuel cell 210. Control can be performed directly.

  Next, a fuel cell system 70 according to Embodiment 2 will be described with reference to FIGS. 9 to 11. FIG. 9 is a schematic configuration diagram schematically showing the fuel cell system of Example 2, and FIGS. 10 and 11 are graphs of examples of control temperatures that change with the passage of time. In the second embodiment, different parts will be described to avoid redundant description. A fuel cell system 70 according to the second embodiment is provided with a plurality of fuel cell modules 5 similar to those of the first embodiment, and the control device 9 executes temperature increase control in the plurality of fuel cell modules 5. Hereinafter, the fuel cell system 70 according to the second embodiment will be described.

  As shown in FIG. 9, the fuel cell system 70 includes a plurality of fuel cell modules 5, an air supply device 6 similar to the first embodiment, a fuel supply device 7 similar to the first embodiment, and the same as the first embodiment. A plurality of combustion fuel supply devices 8 and a control device 9 are provided.

  The air supply device 6 supplies air toward each air supply chamber 208 of each fuel cell module 5, and an air supply flow path R <b> 1 is provided between the air supply device 6 and the plurality of air supply chambers 208. Is provided. The air supply flow path R1 is branched into a plurality of downstream sides, the upstream side of the air supply flow path R1 is connected to the air supply device 6, and the downstream side of the plurality of branched air supply flow paths R1 is a plurality of air supply chambers. 208 are connected to each other. An air flow meter 30 for measuring the flow rate of the circulating air is provided on the upstream side of the air supply flow path R1.

  The fuel supply device 7 supplies fuel gas to each fuel supply chamber 206 of each fuel cell module 5, and a fuel supply flow path R <b> 2 is provided between the fuel supply device 7 and the plurality of fuel supply chambers 206. Is provided. The fuel supply channel R2 is branched into a plurality of downstream sides, the upstream side of the fuel supply channel R2 is connected to the fuel supply device 7, and the downstream side of the branched fuel supply channel R2 is a plurality of fuel supply chambers. 206 are connected to each other.

  A plurality of combustion fuel supply devices 8 are provided so that combustion fuel gas can be supplied to the plurality of downstream-side air supply passages R1. A combustion fuel gas supply flow path R3 is provided between each of the plurality of combustion fuel supply apparatuses 8 and the downstream air supply flow path R1 branched into a plurality. Each combustion fuel gas supply flow path R3 is provided with a combustion fuel gas flow meter 31 for measuring the flow rate of the flowing air, and a flow rate adjusting valve 32 is provided upstream of each combustion fuel gas flow meter 31. Is provided. Each flow rate adjustment valve 32 is connected to the control device 9, and the control device 9 controls each flow rate adjustment valve 32 to adjust the flow rate of the combustion fuel gas to be supplied.

  The fuel cell system includes an ammeter 40, a first temperature sensor 41, a second temperature sensor 2, a third temperature sensor 43, and a fourth temperature sensor 44 similar to those in the first embodiment. The ammeter 40, the first temperature sensor 41, the second temperature sensor 42, the third temperature sensor 43, and the fourth temperature sensor 44 correspond to the plurality of fuel cell modules 5 at the same positions as in the first embodiment. A plurality are provided.

  As in the first embodiment, the control device 9 includes a control temperature setting unit 51, a control flow rate setting unit 52, a flow rate restriction unit 53, and a flow rate control unit 54. For this reason, the control apparatus 9 performs the same control as Example 1 when performing temperature rising control.

  By the way, as shown in FIG. 10, at the start of the temperature increase control of the plurality of fuel cell modules 5, the temperature of the fuel cell 210 in one fuel cell module 5 and the fuel cell 210 in the other fuel cell module 5. The temperature may differ. In other words, the detected temperature of the third temperature sensor 43 provided in one fuel cell module 5 may be high and the detected temperature of the third temperature sensor 43 provided in the other fuel cell module 5 may be low. In this case, the control device 9 detects the detected temperature until the temperature of the fuel cell 210 of the other fuel cell module 5 with the lower detected temperature reaches the temperature of the fuel cell 210 of the one fuel cell module 5 with the higher detected temperature. On the other hand, the temperature rise control of the other fuel cell module 5 having a lower temperature is performed, while the temperature rise control of the other fuel cell module 5 having the higher detected temperature is not performed.

  That is, when executing the temperature increase control of one fuel cell module 5 having a high detected temperature, the control device 9 makes the control temperature setting unit 51 keep the set control temperature constant by setting the temperature change rate to zero. To. On the other hand, when the control device 9 executes the temperature increase control of the other fuel cell module 5 having the lower detected temperature, the control temperature setting unit 51 sets the control temperature based on a predetermined temperature change rate. Increase the control temperature. When the detected temperature of the third temperature sensor 43 provided in one fuel cell module 5 and the detected temperature of the third temperature sensor 43 provided in the other fuel cell module 5 become the same temperature, the control device 9, the control temperature setting unit 51 sets the control temperature based on the temperature change rate that is the same value as the temperature change rate in the temperature increase control of both fuel cell modules 5.

  In addition, as shown in FIG. 11, even when the control temperature set by the control temperature setting unit 51 is the same during the temperature rise control of the plurality of fuel cell modules 5, the fuel cell in one fuel cell module 5 The temperature difference between the temperature of 210 and the temperature of the fuel cell 210 in the other fuel cell module 5 may increase. In other words, the detected temperature of the third temperature sensor 43 provided in one fuel cell module 5 may become higher than the detected temperature of the third temperature sensor 43 provided in the other fuel cell module 5. is there. Note that the solid line in FIG. 11 is the control temperature, and the dotted line is the actual temperature of the fuel cell 210 of the fuel cell module 5. In this case, the control device 9 determines that both of the fuel cells 210 of the other fuel cell module 5 with the lower detection temperature reach the temperature of the fuel cell 210 of the one fuel cell module 5 with the higher detection temperature. The control temperature is kept constant by setting the temperature change rate in the temperature rise control of the fuel cell module 5 to zero.

  When the detected temperature of the third temperature sensor 43 provided in one fuel cell module 5 and the detected temperature of the third temperature sensor 43 provided in the other fuel cell module 5 become the same temperature, the control device 9, the control temperature setting unit 51 returns the temperature change rate in the temperature increase control of both fuel cell modules 5 from zero to a predetermined value, and sets the control temperature based on the predetermined temperature change rate.

  As described above, even when the temperatures of the fuel cells 210 of the plurality of fuel cell modules 5 are different during the temperature increase control of the fuel cell system 70 according to the second embodiment, the fuel cell of the one fuel cell module 5 The temperature of 210 and the temperature of the fuel cell 210 of the other fuel cell module 5 can be set to the same temperature.

DESCRIPTION OF SYMBOLS 1 Fuel cell system 5 Fuel cell module 6 Air supply device 7 Fuel supply device 8 Fuel supply device for combustion 9 Control device 30 Air flow meter 31 Fuel gas flow meter for combustion 32 Flow control valve 40 Ammeter 41 First temperature sensor 42 First 2 temperature sensor 43 3rd temperature sensor 44 4th temperature sensor 51 Control temperature setting part 52 Control flow rate setting part 53 Flow rate restriction part 54 Flow rate control part 70 Fuel cell system 101 Base tube 103 Fuel electrode 104 Solid electrolyte 105 Air electrode 106 Interconnector 201 Casing 202 Cell tube 205 Power generation chamber 206 Fuel supply chamber 207 Fuel discharge chamber 208 Air supply chamber 209 Air discharge chamber 210 Fuel cell R1 Air supply flow path R2 Fuel supply flow path R3 Combustion fuel gas supply flow path

Claims (15)

The fuel cell includes an electrolyte, an air electrode formed on one side of the electrolyte, and a fuel electrode formed on the other side of the electrolyte, and an oxidant gas is circulated on the air electrode side, A fuel cell module capable of generating power by circulating fuel gas on the fuel electrode side;
An oxidant supply means for supplying the oxidant gas to the fuel cell module;
Fuel supply means for supplying the fuel gas to the fuel cell module;
Combustion fuel supply means for supplying combustion fuel gas to the oxidant supply flow path from the oxidant supply means to the fuel cell module;
A flow rate adjusting means capable of adjusting a supply flow rate of the combustion fuel gas supplied to the oxidant supply flow path;
Control means capable of controlling the flow rate adjusting means to adjust the supply flow rate of the combustion fuel gas at the time of temperature rise control for increasing the temperature of the fuel cell. Battery system.   2. The fuel cell system according to claim 1, wherein the control unit controls the flow rate adjusting unit such that the supply flow rate is equal to or less than a preset limit flow rate.   The fuel cell system according to claim 2, wherein the limited flow rate is a first lower limit flow rate that is a flow rate at which the combustion fuel gas cannot explode.   The limit flow rate is a second lower limit flow rate that is a flow rate that does not exceed a predetermined allowable amount of unburned fuel gas mixed in the oxidant gas discharged from the fuel cell module. The fuel cell system according to claim 2 or 3, characterized in that   5. The limit flow rate is a third lower limit flow rate which is a flow rate at which a temperature in a constituent member other than the fuel cell of the fuel cell module is equal to or lower than a predetermined temperature. The fuel cell system according to claim 1.   6. The fourth lower limit flow rate according to claim 2, wherein the limiting flow rate is a fourth lower limit flow rate that is a flow rate at which the oxygen concentration in the oxidant gas consumed at the air electrode is not deficient. 2. The fuel cell system according to item 1. The fuel cell module is
After performing a start-up operation for raising the fuel cell to a predetermined temperature, performing a power generation operation for generating power to the fuel cell,
The restricted flow rate is
A first lower limit flow rate that is a flow rate at which the combustion fuel gas cannot explode;
A second lower limit flow rate that is a flow rate such that the unburned fuel gas for combustion mixed in the oxidant gas discharged from the fuel cell module does not exceed a predetermined allowable amount;
A third lower limit flow rate that is a flow rate such that the temperature in the constituent members other than the fuel cell of the fuel cell module is equal to or lower than a predetermined temperature;
A fourth lower limit flow rate that is a flow rate that results in an oxygen concentration at which oxygen in the oxidant gas consumed at the air electrode is not deficient,
The control means includes
During the start-up operation of the fuel cell module, the lowest flow rate among the first lower limit flow rate, the second lower limit flow rate, and the third lower limit flow rate is set as the limit flow rate, and the fuel cell module generates power. The fuel cell system according to claim 2, wherein the fourth lower limit flow rate is set as the limit flow rate during operation.   The fuel cell system according to any one of claims 2 to 7, wherein the control means increases the supply flow rate when the supply flow rate is smaller than the limit flow rate.   9. The fuel cell system according to claim 1, wherein the control unit starts supply of the combustion fuel gas when a preset supply condition is satisfied. 10. The supply conditions are:
A first supply condition in which the temperature of the fuel cell becomes a temperature at which the combustion fuel gas can be ignited;
A second supply condition in which the flow rate of the oxidant gas supplied toward the fuel cell module is a preset flow rate;
The temperature in the oxidant supply flow path after the combustion fuel gas has joined has a third supply condition in which the combustion fuel gas becomes a temperature at which the combustion fuel gas cannot be ignited,
10. The fuel cell system according to claim 9, wherein the control unit starts supplying the combustion fuel gas when all the supply conditions are satisfied.   The control means supplies a predetermined amount of the combustion fuel gas after the start of the supply of the combustion fuel gas, and after the elapse of a predetermined period from the start of supply, the control flow rate of the supply flow of the combustion fuel gas. The fuel cell system according to claim 1, wherein the fuel cell system is adjusted.   The fuel cell system according to any one of claims 1 to 11, wherein the control unit stops the supply of the combustion fuel gas when a preset supply stop condition is satisfied. The supply stop condition is
A first supply stop condition that is a condition in which the temperature of the constituent members other than the fuel cell of the fuel cell module is higher than a preset upper limit temperature;
A second supply stop condition that is a condition under which the combustion fuel gas ignites in the oxidant supply flow path after the combustion fuel gas has joined;
A third supply stop condition that is a condition in which the temperature of the fuel cell is higher than a preset upper limit temperature;
A fourth supply stop condition that is a condition in which the supply flow rate is greater than the preset restriction flow rate;
A fifth supply stop condition that is a condition in which a temperature difference between the temperature of the fuel battery cell and the control temperature of the fuel battery cell set in the temperature increase control is larger than a preset temperature difference;
A sixth supply stop condition that is a condition in which the temperature raising control is not executed,
13. The fuel cell system according to claim 12, wherein the control unit stops the supply of the combustion fuel gas when at least one of the supply stop conditions is satisfied. The control means includes
Control temperature setting means for setting a control temperature of the fuel cell, which is a target in the temperature increase control;
Control flow rate setting means for setting the control flow rate of the combustion fuel gas based on a temperature difference between the temperature of the fuel cell and the control temperature;
The fuel according to any one of claims 1 to 13, further comprising: a flow rate control unit that controls the flow rate adjusting unit based on a deviation between the supply flow rate and the control flow rate. Battery system. The control means includes
Control temperature setting means for setting a control temperature of the fuel cell, which is a target in the temperature increase control;
14. A flow rate control means for controlling the flow rate adjusting means based on a temperature difference between the temperature of the fuel cell and the control temperature. The fuel cell system described in 1.

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