JP5846831B2 - Humidified gas supply device and method for fuel cell - Google Patents

Description

The present invention relates to an apparatus and method for supplying humidified gas to a fuel cell as part of a fuel cell test that simulates the accelerator work of a vehicle (for example, an automobile, a forklift, a two-wheeled vehicle, etc.) equipped with a fuel cell.

Conventionally, when producing a humidified gas to be supplied to a fuel cell, for example, as described in Patent Document 1, dry gas is blown into the water from the bottom of a sealed tank storing temperature-adjusted water and sealed. A bubbler is used to take out from the outlet provided in the upper part of the tank. When a bubbler is used, the drying gas blown from the bottom of the closed tank stays in the water for a long time (the time required for the drying gas to pass through the water). Therefore, a humidified gas with high dew point accuracy (humidified gas with a dew point equal to the water temperature in the sealed tank) can be obtained.

JP 7-29591 A

However, in the method using a bubbler, when changing the dew point of the humidified gas, it is necessary to change the water temperature in the closed tank, but since a large amount of water is stored in the closed tank, The temperature of the water cannot be changed quickly. For this reason, the method using a bubbler has a problem that it takes a long time to change the dew point.
It is possible to change the temperature of the water in the closed tank quickly by adopting an improved bubbler system with a large capacity heater and cooler installed in the closed tank, but the dew point is faster. Change the size of the humidified gas production device and the structure, increase the production cost, increase the installation area required for the device installation, and complicate the operation. This is not a typical method.

The present invention has been made in view of such circumstances, and provides a humidified gas supply apparatus and method for a fuel cell that can quickly respond to a dew point change request or a pressure change request for a humidified gas supplied to a fuel cell. For the purpose.

A humidifying gas supply device for a fuel cell according to a first aspect of the present invention that supplies the humidifying gas A having a set dew point, a flow rate, and a pressure and exhausting exhaust gas generated during power generation to the outside. A fuel cell humidified gas supply device for use in a fuel cell evaluation test,
A first gas supply unit that heats the drying gas B into a heated drying gas;
A second gas supply unit comprising a humidifying means for blowing a dry gas C of the same type as the dry gas B from the bottom of a sealed tank storing water into a saturated water vapor saturated with water vapor;
A merging unit that generates a humidified gas A by merging the heating and drying gas and the steam saturated gas respectively supplied from the first gas supply unit and the second gas supply unit;
A storage tank that temporarily stores the humidified gas A generated at the merging portion to improve uniformity;
Based on the dew point of the humidified gas A supplied to the fuel cell from the storage tank via the gas introduction pipe, a split ratio of the heated dry gas and the steam saturated gas is obtained, and the split ratio and the flow rate of the humidified gas A are obtained. The heating drying gas and the water vapor saturated gas having the flow rates determined based on the above are supplied to the junction, and the flow rate of the drying gas B determined from the flow rate of the heating drying gas and the pressure of the humidification gas A supplied to the fuel cell are determined. And a control means for controlling the pressure of the dry gas B.

In the humidified gas supply device of the fuel cell according to the first aspect of the present invention, the merging portion includes a first gas flow path through which the heated and dried gas passes, and the first gas flow path including the first gas flow path therein. It is preferable to have a mixer having a second gas flow path in which the central axis is disposed at the same position as the central axis of the flow path and the steam saturated gas passes in the same direction as the heated and dried gas.

In the humidified gas supply device for a fuel cell according to the first invention, the first gas supply unit includes a pressure adjusting means for adjusting the pressure of the dry gas B, and a flow rate of the dry gas B for which the pressure is adjusted. A first dry gas flow rate adjusting means for adjusting; and a gas heating means for heating the dry gas B that has passed through the first dry gas flow rate adjusting means. A second drying gas flow rate adjusting means for adjusting the flow rate; and the humidifying means disposed downstream of the second dry gas flow rate adjusting means, wherein the second dry gas flow rate adjusting means comprises a humidified gas. A flow rate range of A and a parent flow rate adjusting means having a flow rate range of the dry gas C determined from the diversion ratio as an adjustment range, and a parent flow rate adjusting means are arranged in parallel to the parent flow rate adjustment means, and the lower limit side of the flow range of the dry gas C is And a child flow rate adjusting means for the adjustment range. It is preferable.

In the humidified gas supply device for a fuel cell according to the first aspect of the present invention, the humidifying means includes a temperature adjusting unit having a heating function for heating the water in the sealed tank and a cooling function for cooling the water in the sealed tank. It is preferable to have.

A humidifying gas supply method for a fuel cell according to a second invention that meets the above-mentioned object is performed while supplying a humidifying gas A having a dew point, a flow rate, and a pressure, respectively, and discharging exhaust gas generated during power generation to the outside. A fuel cell humidified gas supply method for use in a fuel cell evaluation test,
The humidified gas A is combined at the junction with a heated dry gas obtained by heating the dry gas B, and a steam saturated gas produced by adding a saturated amount of water vapor to the dry gas C of the same type as the dry gas B using a humidifying means. When the humidified gas A is supplied from the storage tank to the fuel cell via the gas introduction pipe after being generated and introduced into the storage tank to improve the uniformity,
Based on the dew point of the humidified gas A supplied to the fuel cell, the split flow ratio of the heated dry gas and the steam saturated gas is obtained, and the heated dry gas at the flow rate determined based on the split flow ratio and the flow rate of the humidified gas A, respectively. In addition, the pressure of the drying gas B is controlled based on the flow rate of the drying gas B determined from the flow rate of the obtained heated drying gas and the pressure of the humidifying gas A supplied to the fuel cell. To do.

In the humidified gas supply method for a fuel cell according to the second aspect of the present invention, the shunt flow is based on a difference between an actual dew point of the humidified gas A measured by a dew point meter provided in the gas introduction pipe and a dew point set to the humidified gas A. It is preferable to correct the ratio

In the humidified gas supply method for a fuel cell according to the second aspect of the present invention, when the dew point set in the humidified gas A is changed, the modification of the diversion ratio is stopped and the diversion ratio is set in the humidified gas A. After a certain period of time has elapsed since the dew point was changed, or after the difference between the measured dew point obtained with the dew point meter and the dew point after the change was within a certain range, It is preferable to resume making corrections.

In the humidified gas supply method for a fuel cell according to the second aspect of the invention, when the pressure set for the humidified gas A is suddenly increased, the correction of the diversion ratio is stopped over the transient response period of the measured pressure of the humidified gas A. Then, it is preferable to prevent the fluctuation of the dew point of the humidified gas A supplied to the fuel cell by fixing the diversion ratio to a value immediately before the change of the pressure of the humidified gas A.

In the humidified gas supply method for a fuel cell according to the second invention, when the flow rate of the humidified gas A supplied to the fuel cell is on the lower limit side of the flow rate range of the humidified gas A, the dew point set for the humidified gas A is humidified. It is possible to compensate for a decrease in the dew point of the humidified gas A supplied to the fuel cell by increasing it by a certain value in accordance with the increase in the pressure of the humidified gas A over a certain period of time after the pressure change of the gas A.
Further, when the flow rate of the humidified gas A supplied to the fuel cell is on the lower limit side of the flow rate range of the humidified gas A, the humidified gas A is determined based on the behavior of decreasing the measured dew point of the humidified gas A over the transient response period. The dew point that is set to 1 can be increased to compensate for a decrease in the dew point of the humidified gas A supplied to the fuel cell.

In the humidified gas supply device of the fuel cell according to the first invention and the humidified gas supply method of the fuel cell according to the second invention, the heated dry gas is used so that the dew point of the humidified gas A becomes the dew point requested to be changed. Since the diversion ratio of the water-saturated gas is changed, it is possible to quickly respond to a request to change the dew point. At this time, since the pressure of the drying gas B is controlled based on the pressure of the humidifying gas A supplied to the fuel cell and the flow rate of the drying gas B that generates the heated drying gas, compared to the second gas supply unit, An appropriate differential pressure can be provided in the first gas supply section that is structurally easy to flow the dry gas B (the differential pressure is likely to be excessive), and the flow rate of the dry gas B passing through the first gas supply section is controlled. Can be performed stably. As a result, the dew point of the humidified gas A can be adjusted quickly and with high accuracy in response to a request for changing the dew point of the humidified gas A.

In the humidified gas supply device of the fuel cell according to the first aspect of the present invention, the joining portion includes a first gas flow path through which the heated and dried gas passes, and a first gas flow path including the first gas flow path therein. In the case of having a mixer having a second gas flow path in which the central axis is disposed at the same position as the central axis and the steam saturated gas passes in the same direction as the heated and dried gas, the first gas flow path Since the cross-sectional area of the second gas flow path is larger than the cross-sectional area of the first gas flow path, the piping resistance of the first gas flow path is increased, and the water vapor saturated gas passing through the second gas flow path is the first gas flow path. In addition, it is possible to prevent the dew from flowing into the first gas flow path structurally even if dew condensation occurs in the second gas flow path. In addition, when the flow rate difference between the heated drying gas and the water vapor saturated gas is large, a gas having a low flow rate is likely to be involved in a gas having a large flow rate, so that mixing of the heated drying gas and the water vapor saturated gas can be promoted.

In the humidified gas supply device for a fuel cell according to the first invention, the first gas supply unit adjusts the flow rate of the dry gas B in which the pressure is adjusted, and pressure adjusting means for adjusting the pressure of the dry gas B When the first drying gas flow rate adjusting means and the gas heating means for heating the drying gas B that has passed through the first drying gas flow rate adjusting means are provided, the temperature when the drying gas B is heated, the drying gas The pressure of B and the flow rate of the drying gas B can be adjusted, respectively, and a heated drying gas having a desired temperature, pressure, and flow rate can be obtained.
Further, when the second gas supply unit includes a second dry gas flow rate adjusting unit that adjusts the flow rate of the dry gas C, and a humidifying unit that is disposed on the downstream side of the second dry gas flow rate adjusting unit, The flow rate of the dry gas C and the amount of water vapor added to the dry gas C can be adjusted, and a water vapor saturated gas having a desired dew point and flow rate can be obtained.
Further, the second dry gas flow rate adjusting means is arranged in parallel with the parent flow rate adjusting means and the parent flow rate adjusting means having the flow rate range of the dry gas C determined from the flow rate range and the diversion ratio of the humidified gas A as the adjustment range. In addition, when it has a child flow rate adjusting means whose adjustment range is the lower limit side of the flow rate range of the dry gas C, it is possible to supply a small amount of water vapor saturated gas to the junction with high accuracy, and the dew point is accurate. A humidified gas A having a low dew point (for example, a dew point of 30 ° C. or lower) can be obtained.

In the humidified gas supply device for a fuel cell according to the first aspect of the invention, the humidifying means has a temperature adjusting unit having a heating function for heating the water in the sealed tank and a cooling function for cooling the water in the sealed tank. If it is, the water temperature in the sealed tank can be lowered using the cooling function, and the flow rate of the water vapor saturated gas used when generating the humid gas A having a low dew point can be prevented, and the dew point can be further reduced. A humidified gas A having an accurate low dew point (for example, a dew point of 30 ° C. or lower) can be obtained.

In the humidified gas supply method of the fuel cell according to the second aspect of the present invention, the shunt ratio is determined based on the difference between the measured dew point of the humidified gas A measured by the dew point meter provided in the gas introduction pipe and the dew point set for the humidified gas A. When correction is performed, the measured dew point of the humidified gas A can be brought close to the set dew point.

In the humidified gas supply method of the fuel cell according to the second aspect of the invention, when the dew point set to the humidified gas A is changed, the correction of the shunt ratio is stopped and the dew point after the change is set to set the shunt ratio to the humidified gas A. When the fixed value is fixed to the value, the heated dry gas and steam saturated gas are supplied to the junction at a diversion ratio determined by the dew point after the change, so the dew point of the humidified gas A changes rapidly toward the dew point requested to be changed. Can be made.
And when resuming to correct the shunt ratio after a certain period of time has elapsed since the dew point change or after the difference between the measured dew point obtained by the dew point meter and the dew point after the change is within a certain value range, Since the difference between the measured dew point and the changed dew point is small, the measured dew point can be easily brought close to the changed dew point by correcting the shunt ratio.

In the humidified gas supply method for a fuel cell according to the second invention, when the pressure set for the humidified gas A is suddenly increased, the correction of the shunt ratio is stopped over the transient response period of the actually measured pressure of the humidified gas A. When the shunt ratio is fixed to the value immediately before the change of the pressure of the humidifying gas A to prevent the fluctuation of the dew point of the humidifying gas A supplied to the fuel cell, the dew point of the humidifying gas A supplied to the fuel cell rapidly decreases. Can be prevented.
Here, when the flow rate of the humidifying gas A supplied to the fuel cell is on the lower limit side of the flow range of the humidifying gas A, the dew point set in the humidifying gas A is humidified for a certain period of time from the time when the pressure of the humidifying gas A is changed. When the gas A is increased by a certain value in accordance with the increase in the pressure of the gas A to compensate for a decrease in the dew point of the humidified gas A supplied to the fuel cell, or the flow rate of the humidified gas A supplied to the fuel cell is In the case of the lower limit side of the flow rate range, the dew point set for the humidified gas A is increased based on the decrease behavior of the measured dew point of the humidified gas A over the transient response period, and the dew point of the humidified gas A supplied to the fuel cell is decreased. Therefore, it is possible to reliably prevent the fuel cell evaluation test from being interrupted and the fuel cell from being damaged during the test.

It is explanatory drawing of the humidified gas supply apparatus of the fuel cell which concerns on one embodiment of this invention. It is explanatory drawing of the humidification means which changes the gas heating means which heats the dry gas B, and the dry gas C into water vapor | steam saturated gas. It is explanatory drawing of a mixer. It is explanatory drawing which shows the fluctuation | variation of the measurement dew point at the time of control of the dew point of the humidification gas A supplied to a fuel cell, and a dew point change. It is explanatory drawing which shows the fluctuation | variation of the measurement dew point at the time of the pressure change of the humidification gas A supplied to a fuel cell.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, a humidified gas supply device 10 (hereinafter, simply referred to as a humidified gas supply device 10) for a fuel cell according to an embodiment of the present invention is a humidified gas in which a dew point, a flow rate, and a pressure are set. A is used for the evaluation test of the fuel cell 11 which is performed while supplying A and exhaust gas generated during power generation to the outside. Here, the humidified gas A is humidified air or humidified fuel gas (for example, humidified hydrogen). Details will be described below.

The humidified gas supply device 10 includes a first gas supply unit 12 that heats the drying gas B to form a heated drying gas, and water vapor that is saturated by adding water vapor to the same drying gas C as the drying gas B. 2nd gas supply part 14 provided with humidification means 13 used as saturated gas, Merger part 15 which combines heating dry gas and water vapor saturated gas, and generates humidification gas A, Humidification gas A generated in merger 15 And a storage tank 16 for temporarily improving the uniformity. Further, the humidified gas supply device 10 obtains a shunt ratio between the heated dry gas and the steam saturated gas that merges based on the dew point of the humidified gas A supplied from the storage tank 16 via the gas introduction pipe 17 to the fuel cell 11, The heated drying gas and the steam saturated gas having the flow rates obtained based on the flow ratio and the humidifying gas A flow rate are respectively supplied to the merging portion 15, and the flow rate of the drying gas B determined from the obtained heated drying gas flow rate and the fuel cell 11. The control means 18 which controls the pressure of the dry gas B based on the pressure of the humidified gas A supplied to is provided.

Here, the dew point, flow rate, and pressure of the humidified gas A controlled by the control means 18 are set by an evaluation test method for the fuel cell 11. Since the heated dry gas is obtained by heating the dry gas B, when the flow rate of the heated dry gas is determined, the flow rate of the dry gas B is determined. Further, since the water vapor saturated gas is obtained by humidifying the dry gas C, when the flow rate of the water vapor saturated gas is determined, the flow rate of the dry gas C is determined.
In FIG. 1, a gas supplied from a common gas source (not shown) is branched into two by a branching portion 19, one being a dry gas B and the other being a dry gas C. It is also possible to supply the dry gases B and C from independent gas sources without providing the common gas source and the branch portion 19. Here, when the humidified gas A is humidified air, the gas source includes a compressor that produces compressed air from air in the atmosphere and a dryer that removes moisture in the compressed air. When the humidified gas A is humidified hydrogen, the gas source is composed of a tank or cylinder storing hydrogen.

The first gas supply unit 12 includes a pressure adjusting valve 20 that is an example of a pressure adjusting unit that adjusts the pressure of the drying gas B, and a first drying gas that adjusts the flow rate of the drying gas B whose pressure has been adjusted. A mass flow measurement and control mechanism 21, which is an example of a flow rate adjusting means, and a gas heating means 22 that heats the dry gas B that has passed through the mass flow measurement and control mechanism 21 to form a heated dry gas. Here, a pressure gauge 23 for measuring the pressure of the dry gas B flowing into the mass flow measurement and control mechanism 21 is provided on the downstream side of the pressure regulating valve 20, and connects the gas heating means 22 and the junction 15. One communication portion 24 is provided with a pressure gauge 25 for measuring the pressure of the heated and dried gas flowing into the merge portion 15. Further, the first communication part 24 is covered with a heat insulating material (not shown) to prevent the temperature of the heated and dried gas flowing into the joining part 15 from the gas heating means 22 from being lowered. Note that a heater may be attached to the first communication portion 24 to heat the first communication portion 24 so as to prevent the temperature of the heated and dried gas from decreasing.
With such a configuration, the temperature at which the drying gas B is heated, the pressure of the drying gas B, and the flow rate of the drying gas B can be adjusted, respectively, and heating having a desired temperature, pressure, and flow rate Dry gas can be obtained.

The second gas supply unit 14 is disposed on the downstream side of the second dry gas flow rate adjusting unit 26 for adjusting the flow rate of the dry gas C, and the temperature-adjusted water. And a humidifying means 13 provided with a sealed tank 32 (see FIG. 2) that stores and converts the dry gas C blown from the bottom into a water-saturated gas, and connects the humidifying means 13 and the junction 15. The part 27 is provided with a pressure gauge 28 for measuring the pressure of the water vapor saturated gas flowing into the merging part 15. Further, the second communication portion 27 is covered with a heat insulating material (not shown), and prevents a temperature drop (condensation) of the water vapor saturated gas flowing from the humidifying means 13 into the joining portion 15. Note that a heater may be attached to the second communication portion 27 to heat the second communication portion 27 so as to prevent the temperature of the steam saturated gas from decreasing.
By setting it as such a structure, the flow volume of the dry gas C and the water vapor | steam amount added to the dry gas C can be adjusted, and the water vapor | steam saturated gas which has a desired dew point and flow volume can be obtained.

The second dry gas flow rate adjustment means 26 is a mass flow rate measurement and control mechanism 29 which is an example of a parent flow rate adjustment means whose adjustment range is the flow rate range of the dry gas C determined from the flow rate range and the diversion ratio of the humidified gas A, An example of a child flow rate adjusting means that is arranged in parallel to the mass flow rate measurement and control mechanism 29 and can adjust the small flow rate accurately and stably with the lower limit side of the flow rate range of the dry gas C as the adjustment range. And a mass flow measurement and control mechanism 30. Here, the flow rate adjustment range of the mass flow measurement and control mechanism 30 is the lower limit side of the flow rate adjustment range of the mass flow measurement and control mechanism 29, for example, 0.04 of the maximum flow rate that can be adjusted by the mass flow measurement and control mechanism 29. It is in the range of ˜2% or in the range of 1 to 50 times the minimum flow rate of the dry gas C.
The control means 18 determines the flow rate of the dry gas C from the mass flow measurement and control mechanisms 29 and 30 when determining the flow rate of the water vapor saturated gas and determining the flow rate of the dry gas C supplied to the humidification means 13. Is provided with a function of selecting a mass flow measurement and control mechanism suitable for the control. As a result, the flow rate of the dry gas C (water vapor saturated gas) can be set accurately. For example, a small flow rate of the water vapor saturated gas can be stably supplied to the junction 15 with high accuracy, and the dew point is accurate. A humidified gas A having a low dew point (for example, a dew point of 30 ° C. or lower) can be obtained.

As shown in FIG. 2, the humidifying means 13 communicates with a dry gas introduction path 31 for taking in the dry gas C whose flow rate is controlled by the second dry gas flow rate adjusting means 26, and a front portion of the dry gas introduction path 31. A height at which a blow-out opening (not shown) is provided at the bottom, and an extraction opening (not shown) to which the base of the second communication portion 27 is connected is provided at the upper end, so that a space is formed on the upper side. And a sealed tank 32 for storing water. Here, a check valve 33 is provided on the inlet side of the dry gas introduction path 31, and the dry gas introduction path is formed on the upstream side of the check valve 33 with water taken from the sealed tank 32 through the intake pipe 34. A heat exchanger 35, which is an example of a heating unit that heats the dry gas C flowing through 31, is provided. The outlet of the heat exchanger 35 is connected to the base of a water supply pipe 36 having a water pump (not shown), and the front side of the water supply pipe 36 passes through the bottom of the closed tank 32 and is arranged in the closed tank 32. The front portion communicates with an inlet (not shown) of a shower mechanism 37 installed in the space above the sealed tank 32.

Then, on the heat exchanger 35 side of the water supply pipe 36, the water that has passed through the heat exchanger 35 and flows into the water supply pipe 36 is stored in the sealed tank 32 before flowing into the sealed tank 32. Is provided with a temperature adjusting unit 38 for heating or cooling so as to be the same temperature. Here, the temperature control unit 38 is disposed in a pipe in a region outside the tank that is disposed outside the sealed tank 32 of the water supply pipe 36, and heats the water that passes through the water supply pipe 36 (has a heating function). The temperature of the water returned to the sealed tank 32 through heat exchange between 39 (for example, an electric heater) and cooling water supplied to the primary side while supplying water passing through the water supply pipe 36 to the secondary side And a heat exchanger 40 for cooling (having a cooling function). The cooling water supplied to the cooling heat exchanger 40 is discharged from the primary side outlet of the cooling heat exchanger 40.
By setting it as such a structure, the water of desired temperature can be spouted from the upper side in the airtight tank 32 by the shower mechanism 37, and the temperature of the water in the airtight tank 32 can be maintained at desired temperature. At the same time, the inside of the sealed tank 32 can be kept at a uniform temperature.

Further, by ensuring a sufficiently long time for the dry gas C blown from the bottom of the sealed tank 32 to stay in water (time required to pass through the water), the sealed tank 32 is removed from the outlet of the sealed tank 32. A saturated amount of water vapor can be mixed in the dry gas C at the same temperature as the water stored in the water, and the water vapor saturated gas (same temperature as the water in the sealed tank 32) in which the water vapor is saturated can be taken out. Note that the saturation amount of water vapor mixed into the dry gas C can be adjusted by changing the temperature of the water stored in the sealed tank 32. And since the dry gas C which blows in is preheated with the heat exchanger 35, it can prevent that the temperature of the water in the airtight tank 32 fluctuates.

The gas heating means 22 for heating the dry gas B is installed on the lower side of the dry gas introduction path 41 for taking in the dry gas B whose flow rate is controlled by the mass flow measurement and control mechanism 21, and the base portion is A spiral gas heating unit 42 communicating with the tip of the dry gas introduction path 41 (that is, when water is stored in the sealed tank 32, the gas heating unit 42 is immersed in water), and a gas heating unit 42 And a communication pipe 43 which is provided at the upper end of the closed tank 32 and communicates with an outlet (not shown) to which the base of the first communication part 24 is connected.
With such a configuration, the dry gas B is the water stored in the sealed tank 32 when passing through the gas heating unit 42, and the upper part in the sealed tank 32 when passing through the communication pipe 43. Each is heated with water ejected by a shower mechanism 37 installed in the side space, and can be made into a heated dry gas having the same temperature as the water vapor saturated gas. This can prevent the temperature of the steam saturated gas from being lowered (condensation occurs in the steam saturated gas) when the heat-dried gas and the steam saturated gas are merged.
Note that a heater may be provided between the mass flow measurement and control mechanism 21 and the first communication portion 24 so that the temperature of the passing dry gas B is heated to the same temperature as the water in the sealed tank 32. .

As shown in FIG. 3, the merging portion 15 is mixed with a mixer 44 in which the tips of the first and second communication portions 24 and 27 are connected to each other so that the heated and dried gas and the steam saturated gas merge (mix). And a humidified gas lead-out path 45 through which the humidified gas A formed by the confluence of the heated drying gas and the steam saturated gas flows. Here, the mixer 44 includes a first gas flow path 46 through which the heated and dried gas passes through the first communication section 24 connected thereto, and a first gas flow path 46 therein. A second gas flow path 47 in which the central axis is disposed at the same position as the central axis of the gas flow path 46 and the water vapor saturated gas supplied via the second communication portion 27 passes in the same direction as the heated and dried gas. And.

With such a configuration, since the cross-sectional area of the second gas flow path 47 is larger than the cross-sectional area of the first gas flow path 46, the pipe resistance of the first gas flow path 46 is increased, It is possible to prevent the water vapor saturated gas passing through the second gas channel 47 from flowing back into the first gas channel 46. Even if condensation occurs in the second gas flow path 47, it is structurally possible to prevent the condensation from entering the first gas flow path 46. Furthermore, if the flow rate difference between the heated drying gas and the water vapor saturated gas is large, the gas having a small flow rate is caught in the gas having a large flow rate, so that the mixing of the heated drying gas and the water vapor saturated gas can be promoted.
In addition, the junction 15 is covered with a heat insulating material (not shown), and prevents temperature reduction of the heated and dried gas, the steam saturated gas, and the humidified gas A, and condensation occurs in the steam saturated gas and the humidified gas A. To prevent that. In addition, you may make it attach a heater to the junction part 15 and heat the junction part 15 and prevent the temperature fall of heat drying gas, water vapor | steam saturated gas, and the humidification gas A. FIG.

The storage tank 16 includes a space portion communicating with the humidified gas outlet passage 45 inside, and the outer peripheral portion is covered with a heat insulating material (not shown). Accordingly, the humidification gas A can be made uniform (for example, pressure) while preventing the temperature of the humidification gas A flowing from the merging portion 15 from decreasing. Then, the humidified gas A uniformized in the storage tank 16 is supplied to the fuel cell 11 through the gas introduction pipe 17. The gas introduction pipe 17 is provided with a dew point meter 48 and a pressure gauge 49 for measuring the dew point and pressure of the humidified gas A supplied to the fuel cell 11, respectively. Further, the gas introduction pipe 17 is covered with a heat insulating material (not shown), and by preventing the temperature of the humidified gas A from decreasing, the humidified gas A is prevented from causing condensation. A heater may be attached to the gas introduction pipe 17.

An exhaust gas discharge port (not shown) of the fuel cell 11 is instructed by a back pressure valve 50 for adjusting the pressure of the exhaust gas, a pressure gauge 51 for measuring the pressure of the exhaust gas, and the pressure of the exhaust gas measured by the pressure gauge 51. Exhaust gas discharge means 52 provided with a pressure setter (not shown) for adjusting the back pressure valve 50 so as to be a value is provided. As a result, the gas pressure in the fuel cell 11 is determined, and the pressure of the humidified gas A supplied to the fuel cell 11 is determined.

The control means 18 inputs the dew point of the humidified gas A, the flow rate of the humidified gas A, and the target value of the pressure of the humidified gas A set by the evaluation test method of the fuel cell 11, and the input to the input unit. A temperature setting unit that sets the temperature of the water stored in the sealed tank 32 of the humidifying means 13 based on the dew point (set), and a heating drying gas and a steam saturated gas at a temperature set by the temperature setting unit. The flow rate and the flow rate of the set humidification gas A, and the flow rate calculation unit for determining the flow rate ratio of the heating and drying gas and the steam saturated gas that flows into the merge portion 15 to produce the humidified gas A having the set dew point. And a gas flow rate setting unit for setting the flow rates of the heating and drying gas and the steam saturated gas flowing into the merging unit 15 from the diversion ratio.

Further, the control means 18 includes a flow rate control unit for the dry gas B that outputs a control signal of the mass flow measurement and control mechanism 21 so that the dry gas B having a flow rate set by the gas flow rate setting unit is obtained, and a gas flow rate setting. Depending on the flow rate of the dry gas C set in the unit, the mass flow measurement and control mechanism 29, 30 is activated to output one of the operation designation signals to stop the other (when the flow rate is small) or activated Drying that outputs a control signal for setting the flow distribution of the mass flow measurement and control mechanisms 29 and 30 using the mass flow measurement and control mechanisms 29 and 30 to obtain a dry gas C having a set flow rate. A flow control unit for the gas C. Further, the control means 18 uses the mass gas flow measurement and control mechanism 21 to supply the dry gas B based on the pressure of the humidified gas A set by the input unit and the flow rate of the dry gas B set by the gas flow rate setting unit. And a pressure setting unit for the dry gas B for outputting a control signal for the pressure regulating valve 20.

Here, the diversion ratio calculation unit is provided with a diversion ratio correction mechanism that corrects the diversion ratio based on the difference (deviation) between the measured dew point of the humidified gas A measured by the dew point meter 48 and the set dew point. ing.
Further, in order to change the dew point of the humidified gas A supplied to the fuel cell 11 in the shunt ratio calculation unit, when the dew point set to the humidified gas A is changed (when a new dew point is input to the input unit). In addition to stopping the operation of the shunt ratio correction mechanism, the shunt ratio is set to a value determined from the dew point after the change to set the humidifying gas A, and after a dew point change (after a new dew point is set) for a certain time ( For example, a dew point change response mechanism having a function of restarting the operation of the diversion ratio correction mechanism after 20 seconds) is provided.
The function of the dew point change response mechanism is such that the deviation between the measured dew point obtained by the dew point meter 48 and the dew point after the change is within a certain value range (for example, the deviation exceeds 0 with respect to the dew point and is 5% or less). Thereafter, the operation of the shunt ratio correction mechanism may be resumed.

And in the input part, in order to increase the pressure of the humidified gas A supplied to the fuel cell 11 rapidly,
When the pressure set for the humidified gas suddenly increases (when the new pressure of the humidified gas A is set in the input section), the correction of the shunt ratio is stopped and the transient response period of the measured pressure of the humidified gas A (humidified) After the actual pressure of the gas A reaches a new pressure, the fuel cell is fixed to the value immediately before the change of the pressure of the humidified gas A over a period from several seconds to several tens of seconds) The humidification gas pressure change corresponding mechanism which has a function which prevents the fluctuation | variation of the dew point of the humidification gas A supplied to 11 is provided.
Further, the humidifying gas pressure changing mechanism has a dew point set to the humidifying gas A as the pressure of the humidifying gas A when the flow rate of the humidifying gas A supplied to the fuel cell 11 is the lower limit side of the flow range of the humidifying gas A. A compensation function is provided that compensates for a decrease in the dew point of the humidified gas A supplied to the fuel cell 11 by increasing it by a certain value in accordance with the increasing range of the pressure of the humidified gas A over a certain time from the time of change.
It should be noted that the compensation function provided in the humidifying gas pressure change mechanism increases the dew point set in the humidifying gas A based on the decrease behavior of the measured dew point of the humidifying gas A over the transient response period (for example, the humidifying gas). A dehumidifying behavior of A is obtained, and a function equation indicating the deteriorating behavior is obtained in advance, and the dew point is increased by the dew point reduction amount predicted by this functional equation), and the humidified gas supplied to the fuel cell 11 It can also be set as the function which compensates the fall of the dew point of A.

Then, the humidified gas supply method of the fuel cell 11 which concerns on one embodiment of this invention using the humidified gas supply apparatus 10 is demonstrated.
When the evaluation test of the fuel cell 11 is performed, the dew point, the flow rate, and the pressure of the humidified gas A supplied to the fuel cell 11 vary depending on the content of the evaluation test. For this reason, first, the dew point, flow rate, and pressure of the humidified gas A required for the evaluation test are input to the input unit of the control means 18 of the humidified gas supply apparatus 10 to start the operation of the humidified gas supply apparatus 10. .

Here, by performing an operation test of the humidified gas supply device 10, the conditions (dew point, flow rate, and pressure) of the humidified gas A supplied to the fuel cell 11 and the conditions (flow rate and flow rate) of the heated dry gas (dry gas B) are determined. Pressure) and the conditions (flow rate and pressure) of the steam saturated gas (dry gas C) can be grasped in advance. For this reason, when the dew point, flow rate, and pressure of the humidified gas A supplied to the fuel cell 11 during the evaluation test of the fuel cell 11 are determined, the flow rate, pressure, and dry gas of the dry gas B when the humidified gas supply device 10 is operated. The flow rate and pressure of C can be estimated respectively. Therefore, the humidified gas supply device 10 is operated with the estimated flow rates and pressures of the dry gases B and C as initial values. The temperature of the water stored in the sealed tank 32 of the humidifying means 13 is controlled by the temperature adjusting unit 38 so as to be maintained at a temperature higher than the dew point of the humidified gas A by, for example, 5 to 10 ° C.
When the heater is provided between the mass flow measurement and control mechanism 21 and the first communication part 24 to heat the drying gas B, the temperature of the drying gas B to be heated is the same as the water temperature of the sealed tank 32. The heater is controlled so that

Next, based on the set dew point of the humidified gas A, a branching ratio between the heated dry gas and the water vapor saturated gas that merges at the merge unit 15 is obtained.
Here, the dew point (° C.) is t _d , the temperature (° C.) in the sealed tank 32 (water in the sealed tank 32) is t _s , and the pressure (Pa) of the water vapor saturated gas in the sealed tank 32 is p _s . pressure (Pa) of _{p t} of the humidified gas a in the tank 16, the saturated steam pressure of water vapor saturated gas in the sealed tank 32 _{(Pa) e s (t s} ), the saturated water vapor pressure at the dew point (Pa) _{e s} (t _d), the flow rate ratio of the drying gas C to the total flow rate of the drying gas B and the drying gas C gamma Then, saturation in dew point vapor pressure e _{s (t d)} is given by formula (a) (e.g., humidity Total-Testing method JIS B 7920: 2000, page 5 (see formula (8))
_{e s (t d) = p} t γe s (t s) / {p s - (1-γ) e s (t s)} ··· (a)

When γ is obtained from equation (a), γ is given by equation (b).
_{γ = (p s -e s (} t s)) e s (t d) / (p t -e s (t d)) e s (t s) ··· (b)
Here, t _d is given as an evaluation test condition for the fuel cell 11, t _s is measured by a thermometer (not shown) inserted in the sealed tank 32, p _s is from the pressure gauge 28, and _pt is from the pressure gauge 49. can be obtained _{respectively, e s (t d),} e s (t s) is, for example, JIS B 7920: can be obtained from the saturated vapor pressure of 2000 21 pages Sonntag (15). Therefore, γ can be determined by calculating equation (b).

When the diversion ratio (γ) is determined, when the flow rate of the humidified gas A is Q, the flow rate of the heating and drying gas is q _d , and the flow rate of the steam saturated gas is q _w ,
γ = q _w / Q = q _w / (q _d + q _w )
Since the relationship is established, the flow rate q _w of water vapor saturated gas GanmaQ, flow rate q _d for heating the drying gas can be determined respectively (1-γ) Q. Here, the flow rate of the drying gas B is equal to the flow rate q _d of the heated drying gas, and the flow rate of the drying gas C is equal to the flow rate q _w of the water vapor saturated gas, so that the mass flow rate is set so that the flow rate of the drying gas B becomes q _d. controls measurement and control mechanism 21, the flow rate of the drying gas C controls the second drying gas flow rate control means 26 so that q _w. In the case where the flow rate control of the drying gas C in the second drying gas flow rate control means 26, according to the value of the flow rate q _w, configured to have mass flow measurement and control a second drying gas flow rate control means 26 The mass flow measurement and control mechanism used in the mechanisms 29 and 30 is selected, or the flow distribution setting is performed for each.

Further, when the pressure of the dry gas B flowing into the mass flow measurement and control mechanism 21 is P ₀ , the pressure of the humidified gas A supplied to the fuel cell 11 is P _b , and the flow rate of the dry gas B is q _d , Based on the flow rate q _d of the dry gas B and the pressure P _b of the humidified gas A, the pressure B ₀ of the gas B is controlled to be P ₀ determined from, for example, a relational expression of P ₀ = P _b + Kq _d ^2. ing. Here, K is a numerical constant and is determined according to the humidified gas supply device 10.
By controlling the pressure P ₀ of the drying gas B based on the flow rate q _d of the drying gas B and the pressure P _b of the humidifying gas A, the drying gas B is structurally compared to the second gas supply unit 14. Can be provided with an appropriate differential pressure in the first gas supply unit 12 and the flow rate of the dry gas B passing through the first gas supply unit 12 can be controlled stably. It can be carried out. As a result, the dew point of the humidified gas A can be adjusted quickly and with high accuracy in response to a request for changing the dew point of the humidified gas A.

In a state where the dew point of the humidified gas A is controlled to a constant value, the measured dew point of the humidified gas A measured by the dew point meter 48 provided in the gas introduction pipe 17 and the dew point input to the input unit (that is, the set dew point) The dew point feedback control is performed by correcting the calculated output value of the diversion ratio by a method such as PID control based on the difference (deviation) from the control target dew point). As a result, the measured dew point of the humidified gas A can be brought close to the set dew point (target dew point) and the measured dew point can be stabilized.

Here, when a new dew point is input to the input unit of the control means 18 in response to a request to change the dew point of the humidified gas A supplied to the fuel cell 11 (the dew point set for the humidified gas A is changed), The calculation unit stops the operation of the shunt ratio correction mechanism to stop the dew point feedback control, and fixes the shunt ratio to a value determined from the dew point after the change (that is, the dew point control is combined with feedback and feedforward control). After the dew point is changed, the operation of the diversion ratio correcting mechanism is resumed (dew point feedback control is resumed) after a fixed time (for example, 10 to 20 seconds) has elapsed since the dew point was changed.
Note that the deviation between the measured dew point calculated by the dew point meter 48 and the changed target dew point is within a certain range (for example, the deviation is less than the changed target dew point dew point). may be a period until less than 5%) greater than 0 Te.

As a result, the heated dry gas and the steam saturated gas are supplied to the junction 15 at a diversion ratio determined by the changed dew point, so that the dew point of the humidified gas A can be rapidly changed toward the changed dew point. Then, after a certain period of time has elapsed since the change of the target dew point, or after the difference between the measured dew point obtained by the dew point meter 48 and the target dew point after the change is within a certain range, the dew point is obtained by correcting the diversion ratio. Therefore, the measured dew point can be easily brought close to the changed target dew point and stabilized.

In a state where the dew point of the humidified gas A is controlled to a constant value, a new pressure is input to the input unit of the control means 18 in response to a request for changing the pressure of the humidified gas A supplied to the fuel cell 11 (humidified gas A When the pressure of the humidifying gas A is rapidly increased by changing the pressure to be set to 1), the transient response period of the actually measured pressure of the humidifying gas A (after the measured pressure of the humidifying gas A reaches the set new pressure, Over the period from several seconds to several tens of seconds), the correction of the diversion ratio is stopped and the feedback control of the dew point is stopped, and the diversion ratio is fixed to the value immediately before the change of the pressure of the humidified gas A (dew point). Is changed from feedback and feedforward combined control to feedforward independent control), and the dew point of the humidified gas A supplied to the fuel cell 11 is prevented from changing.

Here, when the flow rate of the humidified gas A supplied to the fuel cell 11 is on the lower limit side of the flow range of the humidified gas A (for example, a range of 1 to 20 times the minimum flow rate), the dew point of the humidified gas A is A constant value (for example, more than 1 and 1.2 times or less of the rising width) over a certain period of time (for example, exceeding 0 and 120 seconds or less) from the time of changing the pressure of the gas A according to the increasing width of the pressure of the humidified gas A The dew point of the humidified gas A supplied to the fuel cell 11 is compensated for.
In addition, by raising the set dew point of the humidified gas A based on the decrease behavior of the measured dew point of the humidified gas A over the transient response period z, for example, the set dew point (target dew point of control) is t. _{When d} , the decrease behavior of the measured dew point of the humidified gas A is obtained, and the function formula F (z) indicating the decrease behavior is obtained in advance, and only the dew point reduction amount predicted by the function formula F (z) is set. that increase the dew point, i.e. the target dew point of the humidified gas a is Ri by the controlling such that t _{d +} F (z), be adapted to compensate for the reduction in the dew point of the supplied humidified gas a to the fuel cell 11 You can also. Thereby, interruption of the evaluation test of the fuel cell 11 and breakage of the fuel cell 11 during the test can be reliably prevented.

(Example 1)
In order to supply humidified gas A with a dew point of 80 ° C. to the fuel cell, 80 ° C. is input (set) as a dew point (target dew point) to the input part of the control means, and based on the deviation between the dew point measured by the dew point meter and the target dew point The control of the dew point of the humidified gas A (dew point feedback control) was performed while correcting the calculated output value of the shunt ratio by PID control. The result is shown in FIG.
It was confirmed that the measured dew point can be stably maintained at the target dew point of 80 ° C. by controlling the flow rates of the heating and drying gas and the steam saturated gas while correcting the calculated output value of the diversion ratio.

(Example 2)
While the target dew point is controlled to 80 ° C, 30 ° C is input as a newly set dew point (target dew point) to the input unit, and the target dew point is suddenly lowered from 80 ° C to 30 ° C and held. It was. At this time, the flow rates of the heating and drying gas and the water-saturated gas flowing into the junction are fixed to flow rates determined from the diversion ratio when generating the humidified gas A having a dew point of 30 ° C. (feed forward alone with a dew point of 30 ° C. Control). The result is shown in FIG.
The measured dew point of the humidified gas A changed following the rapid decrease of the target dew point, and it was confirmed that the dew point of the humidified gas A could be rapidly decreased.

(Example 3)
In a state where the target dew point is controlled to 30 ° C., 80 ° C. is input as a newly set dew point (target dew point) to the input unit, and the target dew point is rapidly increased from 30 ° C. to 80 ° C. and maintained. . At this time, the flow rates of the heating and drying gas and the water vapor saturated gas flowing into the junction are fixed to flow rates determined from the diversion ratio when the humidified gas A having the dew point of 80 ° C. is generated at the start of the sudden rise of the dew point (the dew point is set to 80 ° C. After 30 seconds have elapsed from when the dew point suddenly started to rise (after the measured dew point approaches the target dew point of 80 ° C), the feed forward single control was changed to feedback control with a dew point of 80 ° C. did. That is, when the dew point is rapidly increased from 30 ° C. to 80 ° C., feedforward and feedback combined control are performed. The result is shown in FIG.
Corresponding to the target dew point of humidified gas A increasing rapidly from 30 ° C to 80 ° C, the measured dew point has increased rapidly from 30 ° C to 80 ° C, and it can be confirmed that the dew point of humidified gas A can be increased rapidly and increased rapidly. It was confirmed that the measured dew point could be maintained at 80 ° C.

Example 4
While the target dew point of the humidified gas A supplied to the fuel cell is controlled at 60 ° C., the pressure (back pressure) set for the humidified gas A supplied to the fuel cell is rapidly increased from 10 kPa to 250 kPa as a gauge pressure. During the control to rapidly decrease after holding the time, the transient response period of the measured back pressure of the humidified gas A accompanying the rapid increase of the back pressure (the measured back pressure of the humidified gas A from the time when the pressure of the humidified gas A is changed becomes the back pressure control value. The feedforward single control was performed in which the target dew point of the humidified gas A was rapidly increased to 65 ° C. over a period of time until reaching the range of 3%. The result is shown in FIG.
Along with the rapid increase in back pressure, the target dew point of the humidified gas A is rapidly increased from 60 ° C. to 5 ° C., so that it occurs in the period required for the measured back pressure to stabilize to the back pressure control value increased from 10 kPa to 250 kPa as the gauge pressure. The amount of decrease in the measured dew point relative to the target dew point of 60 ° C. can be about 3 ° C. or less.

(Comparative example)
Control in which the back pressure set for the humidified gas A supplied to the fuel cell is rapidly increased by 250 Pa while the target dew point of the humidified gas A supplied to the fuel cell is controlled at 60 ° C., and then rapidly decreased after being held for a certain period of time. FIG. 5 shows the variation of the measured dew point of the humidified gas A when performing the above. The amount of decrease in the measured dew point that occurs during the period required for the measured back pressure to stabilize to the back pressure control value increased by 250 Pa with respect to the target dew point of 60 ° C. was about 10 ° C. at the maximum.
Therefore, by rapidly increasing the back pressure control value of the humidified gas A supplied to the fuel cell, by rapidly increasing the target dew point of the humidified gas A over the transient response period of the measured back pressure of the humidified gas A, It was confirmed that the amount of decrease in the measured dew point that occurs during the period until the measured back pressure stabilizes to the back pressure control value can be reduced (the dew point decrease can be compensated).

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
Further, the present invention also includes a combination of components included in the present embodiment and other embodiments and modifications.

DESCRIPTION OF SYMBOLS 10: Humidification gas supply apparatus, 11: Fuel cell, 12: 1st gas supply part, 13: Humidification means, 14: 2nd gas supply part, 15: Merging part, 16: Reservoir, 17: Gas introduction piping , 18: control means, 19: branching part, 20: pressure regulating valve, 21: mass flow measurement and control mechanism, 22: gas heating means, 23: pressure gauge, 24: first communication part, 25: pressure gauge, 26: second dry gas flow rate adjusting means, 27: second communication portion, 28: pressure gauge, 29, 30: mass flow measurement and control mechanism, 31: dry gas introduction path, 32: closed tank, 33: reverse Stop valve, 34: intake pipe, 35: heat exchanger, 36: water supply pipe, 37: shower mechanism, 38: temperature control unit, 39: heater, 40: heat exchanger for cooling, 41: dry gas introduction path, 42: Gas heating unit, 43: Communication pipe, 44: Mixer, 45: Humidified gas guide Road, 46: first gas flow path, 47: second gas flow path, 48: hygrometer, 49: pressure gauge, 50: back pressure valve, 51: pressure gauge, 52: exhaust gas discharging means

Claims (10)

A humidifying gas supply device for a fuel cell used for an evaluation test of a fuel cell that supplies a humidifying gas A having a set dew point, a flow rate, and a pressure and discharges exhaust gas generated during power generation to the outside,
A first gas supply unit that heats the drying gas B into a heated drying gas;
A second gas supply unit comprising a humidifying means for blowing a dry gas C of the same type as the dry gas B from the bottom of a sealed tank storing water into a saturated water vapor saturated with water vapor;
A merging unit that generates a humidified gas A by merging the heating and drying gas and the steam saturated gas respectively supplied from the first gas supply unit and the second gas supply unit;
A storage tank that temporarily stores the humidified gas A generated at the merging portion to improve uniformity;
Based on the dew point of the humidified gas A supplied to the fuel cell from the storage tank via the gas introduction pipe, a split ratio of the heated dry gas and the steam saturated gas is obtained, and the split ratio and the flow rate of the humidified gas A are obtained. The heating drying gas and the water vapor saturated gas having the flow rates determined based on the above are supplied to the junction, and the flow rate of the drying gas B determined from the flow rate of the heating drying gas and the pressure of the humidification gas A supplied to the fuel cell are determined. And a control means for controlling the pressure of the dry gas B based on the humidified gas supply device of the fuel cell. 2. The humidified gas supply device for a fuel cell according to claim 1, wherein the merging portion includes a first gas flow path through which a heated and dried gas passes, and the first gas flow path therein. A fuel comprising a mixer having a second gas flow path in which a central axis is disposed at the same position as the central axis of a passage and a water vapor saturated gas passes in the same direction as the heated and dried gas Battery humidification gas supply device. 3. The humidified gas supply device for a fuel cell according to claim 1, wherein the first gas supply unit includes pressure adjusting means for adjusting the pressure of the dry gas B, and a flow rate of the dry gas B subjected to pressure adjustment. And a gas heating means for heating the drying gas B that has passed through the first drying gas flow rate adjusting means, and the second gas supply unit includes a drying gas C. A second drying gas flow rate adjusting means for adjusting the flow rate of the first drying gas flow rate adjusting means, and the humidifying means disposed downstream of the second drying gas flow rate adjusting means. A parent flow rate adjusting means having a flow rate range of the gas A and a flow range of the dry gas C determined from the diversion ratio as an adjustment range, and a lower limit side of the flow rate range of the dry gas C disposed in parallel to the parent flow rate adjusting means. A child flow rate adjusting means having an adjustment range of Humidified gas supply device for a fuel cell, characterized in that there. The humidification gas supply apparatus of the fuel cell of any one of Claims 1-3 WHEREIN: The said humidification means has the heating function which heats the water in the said airtight tank, and the cooling function which cools the water in this airtight tank A humidified gas supply device for a fuel cell, comprising: a temperature control unit comprising: A humidifying gas supply method for a fuel cell that is used for an evaluation test of a fuel cell that is performed while supplying a humidifying gas A having a set dew point, a flow rate, and a pressure, and exhausting exhaust gas generated during power generation to the outside,
The humidified gas A is combined at the junction with a heated dry gas obtained by heating the dry gas B, and a steam saturated gas produced by adding a saturated amount of water vapor to the dry gas C of the same type as the dry gas B using a humidifying means. When the humidified gas A is supplied from the storage tank to the fuel cell via the gas introduction pipe after being generated and introduced into the storage tank to improve the uniformity,
Based on the dew point of the humidified gas A supplied to the fuel cell, the split flow ratio of the heated dry gas and the steam saturated gas is obtained, and the heated dry gas at the flow rate determined based on the split flow ratio and the flow rate of the humidified gas A, respectively. In addition, the pressure of the drying gas B is controlled based on the flow rate of the drying gas B determined from the flow rate of the obtained heated drying gas and the pressure of the humidifying gas A supplied to the fuel cell. A humidified gas supply method for a fuel cell. 6. The humidifying gas supply method for a fuel cell according to claim 5, wherein the flow dividing ratio is based on a difference between an actual dew point of the humidifying gas A measured by a dew point meter provided in the gas introduction pipe and a dew point set to the humidifying gas A. A humidified gas supply method for a fuel cell, characterized in that The humidified gas supply method for a fuel cell according to claim 6, wherein when the dew point set in the humidified gas A is changed, the correction of the diversion ratio is stopped and the diversion ratio is set in the humidified gas A after the change. After fixing the dew point to a fixed value and after a certain period of time has elapsed since the dew point was changed, or after the difference between the measured dew point obtained with the dew point meter and the dew point after the change was within the fixed value range, the diversion ratio was corrected. The method of supplying a humidified gas for a fuel cell is characterized by restarting the operation. 7. The humidifying gas supply method for a fuel cell according to claim 6, wherein when the pressure set for the humidifying gas A is suddenly increased, the correction of the diversion ratio is stopped over a transient response period of the actually measured pressure of the humidifying gas A. A humidifying gas supply method for a fuel cell, wherein the diversion ratio is fixed to a value immediately before the change of the pressure of the humidifying gas A to prevent fluctuations in the dew point of the humidifying gas A supplied to the fuel cell. 9. The humidifying gas supply method for a fuel cell according to claim 8, wherein when the flow rate of the humidifying gas A supplied to the fuel cell is on the lower limit side of the flow rate range of the humidifying gas A, the dew point set for the humidifying gas A is set to the humidifying gas. A fuel which is increased by a constant value in accordance with an increase width of the pressure of the humidified gas A over a predetermined time from the time when the pressure of A is changed, and compensates for a decrease in the dew point of the humidified gas A supplied to the fuel cell. A humidified gas supply method for a battery. 9. The humidified gas supply method for a fuel cell according to claim 8, wherein when the flow rate of the humidified gas A supplied to the fuel cell is on the lower limit side of the flow rate range of the humidified gas A, the humidified gas A over the transient response period. A humidifying gas supply method for a fuel cell, wherein the dew point set for the humidifying gas A is increased based on the behavior of decreasing the measured dew point to compensate for the decrease in the dew point of the humidifying gas A supplied to the fuel cell.

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