JP2001319672A - Pressure control method for pressurized solid electrolyte fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure control method for pressurized solid electrolyte fuel cell system with good controllability for an internal pressure in a pressure vessel. SOLUTION: The pressure control method comprises the first pressure measurement means 6 for measuring a pressure in a pressure vessel 3, the first control calculation means 7 for making a control calculation for controlling the pressure in a pressure vessel 3 based on a pressure measured by the first pressure measurement means 6, the first pressure control means 4 for controlling the pressure in a pressure vessel 3 based on a result of the control calculation made by the first control calculation means 7, the first state acquisition means 8 for acquiring control state information from the first pressure control means 4, the second control calculation means 9 for making a control calculation for controlling the pressure in a pressure vessel 3 based on the control state information acquired by the first state acquisition means 8, and the second pressure control means 10 for controlling the pressure in a pressure vessel 3 based on a result of the control calculation made by the second control calculation means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure control method for a pressurized solid electrolyte fuel cell system, and more particularly, to a pressure control method suitable for controlling the internal pressure of a pressure vessel in which a solid electrolyte fuel cell is installed. The present invention relates to a pressure control method for a pressurized solid electrolyte fuel cell system.

[0002]

2. Description of the Related Art In a pressurized solid electrolyte fuel cell system, power generation (operation) is performed by supplying a fuel gas, an oxidizing gas, and a dilution gas necessary for power generation to a solid electrolyte fuel cell.

[0003] This operation is performed utilizing an exothermic reaction caused under high temperature and high pressure. Therefore, in this type of system, the solid electrolyte fuel cell is installed in a pressurized pressure vessel, and the pressure in the pressurized solid electrolyte fuel cell system that efficiently generates power by controlling the pressure in the pressure vessel is controlled. A control method has been applied.

FIG. 5 is a system configuration diagram of a pressurized solid electrolyte fuel cell system to which a conventional pressure control method of a pressurized solid electrolyte fuel cell system of this type is applied.

The gas container 1 contains H ₂ (hydrogen) as a fuel.
Gas, N ₂ (nitrogen) gas as a reaction diluent, and air as an oxidant are filled under pressure. The flow rate of the pressurized gas filled in the gas container 1 is controlled by the flow controller 2 and supplied to the pressure container 3.

[0006] A solid electrolyte fuel cell (not shown) is provided inside the pressure vessel 3. In this solid electrolyte fuel cell, a pressurized gas supplied to the pressure vessel 3 is used to cause an exothermic reaction. It is. Thermal energy caused by the exothermic reaction is recovered by a heat exchange means (not shown).

The gas generated by the exothermic reaction in the solid oxide fuel cell and the gas not used for the exothermic reaction are discharged from the pressure vessel 3 to the discharge vessel 5 via the pressure control valve 4 as exhaust gas. . The discharge container 5 has a discharge port (not shown), and the exhaust gas discharged from the pressure vessel 3 side is discharged to the outside by opening the discharge port appropriately.

On the other hand, the internal pressure of the pressure vessel 3 is measured by the pressure measuring device 6 and input to the control device 7. Based on the internal pressure measured by the pressure measuring device 6, the control device 7 adjusts the valve opening of the pressure control valve 4. Thereby, the internal pressure of the pressure vessel 3 is controlled.

[0009]

However, such a conventional pressurized solid electrolyte fuel cell system has the following problems.

That is, as described above, the pressure in the pressure vessel 3 is controlled by adjusting the valve opening of the pressure control valve 4, but is supplied to the pressure vessel 3 in the pressurized solid electrolyte fuel cell system. Wide change range of gas flow. Furthermore,
The pressure change width of the internal pressure of the pressure vessel 3 to be controlled is also wide.

As shown in FIG. 6, the relationship between the valve opening degree of the pressure control valve 4 and the flow rate is generally such that when the valve opening degree is small, even if the valve opening degree is largely changed, the changing flow rate is small. Negligible. Conversely, when the valve opening is large, the sensitivity of the flow rate to a change in the valve opening increases, and in the intermediate opening range, which is an intermediate valve opening, the flow rate also increases with a change in the valve opening. It changes almost in proportion.

Therefore, in the conventional pressurized solid electrolyte fuel cell system, when the gas flow rate is low, the valve opening of the pressure control valve 4 becomes small, so that the sensitivity of the flow rate change to the valve opening change is low. Poor control response due to small size,
There is a problem that control of the internal pressure of the pressure vessel 3 becomes difficult.

On the other hand, when the gas flow rate is high,
Since the pressure in the pressure vessel 3 increases, the flow rate greatly changes even with a slight change in the valve opening, and thus there is a problem that it is difficult to control the internal pressure of the pressure vessel 3.

The present invention has been made in view of the above circumstances, and it is intended to easily control the flow rate of a gas discharged from a pressure vessel and thereby to provide a pressurized solid which is excellent in controllability of the internal pressure of the pressure vessel. An object of the present invention is to provide a pressure control method for an electrolyte fuel cell system.

[0015]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures.

That is, according to the first aspect of the present invention, there is provided a pressure control method for a pressurized solid electrolyte fuel cell system for controlling a pressure in a pressurized pressure vessel in which a solid electrolyte fuel cell is installed. First pressure measurement means for measuring pressure; first control calculation means for performing control calculation for controlling the pressure in the pressure vessel based on the pressure measured by the first pressure measurement means; Pressure control means for controlling the pressure in the pressure vessel based on the result of the control calculation performed by the control calculation means, and first state obtaining means for obtaining control state information of the first pressure control means And a second control calculation means for performing a control calculation for controlling the pressure in the pressure vessel based on the control state information acquired by the first state acquisition means, and a second control calculation means. System And a second pressure control means for controlling the pressure in the pressure vessel based on the result of the operation.

According to a second aspect of the present invention, in the pressure control method for a pressurized solid electrolyte fuel cell system according to the first aspect of the present invention, the second control operation means includes a means for controlling the pressure measured by the first pressure measurement means in advance. When the difference from the determined pressure is larger than a predetermined value, the pressure in the pressure vessel is determined based on the pressure measured by the first pressure measuring unit and the control state information acquired by the first state acquiring unit. A control operation for controlling the pressure is performed.

According to a third aspect of the present invention, in the pressure control method for a pressurized solid electrolyte fuel cell system according to the first or second aspect, the fuel used for the solid electrolyte fuel cell installed inside the pressure vessel is used. A second pressure measuring means for measuring a differential pressure between an introduced pressure introduced into the pressure vessel and a pressure in the pressure vessel, and controlling the introduced pressure based on the differential pressure measured by the second pressure measuring means. A third control operation means for performing the control operation of the third control operation means, a third pressure control means for controlling the introduction pressure based on the result of the control operation performed by the third control operation means, and a third pressure control means. A second state acquisition unit that acquires control state information; and a third state acquisition unit that acquires a third state based on the control state information acquired by the second state acquisition unit.
A fourth control calculating means for performing a control calculation for controlling the pressure control means, and a fourth control calculating means for controlling the third pressure control means based on a result of the control calculation performed by the fourth control calculating means. Pressure control means.

According to a fourth aspect of the present invention, in the pressure control method for a pressurized solid electrolyte fuel cell system according to any one of the first to third aspects, the first pressure control means is a valve, and the first pressure control means is a valve. The state acquiring means acquires, as control state information of the first pressure control means, a valve opening degree of a valve which is the first pressure control means.

According to a fifth aspect of the present invention, in the pressure control method for a pressurized solid electrolyte fuel cell system according to any one of the first to third aspects, the first pressure control means comprises:
A valve provided between the pressure vessel and the second pressure control means, wherein the first state obtaining means detects the control state information of the first pressure control means as a valve of the valve which is the first pressure control means. The differential pressure data between the pressure on the pressure vessel side and the pressure on the second pressure control means side is acquired.

According to a sixth aspect of the present invention, in the pressure control method for a pressurized solid electrolyte fuel cell system according to the fifth aspect of the present invention, the second pressure control means is provided on a pressure vessel side of a valve which is the first pressure control means. The pressure in the pressure vessel is controlled so that the pressure difference between the pressure on the second pressure control means side and the pressure on the second pressure control means side becomes substantially constant.

According to a seventh aspect of the present invention, in the pressure control method for a pressurized solid electrolyte fuel cell system according to any one of the fourth to sixth aspects, the second pressure control means includes:
The amount of change in the valve opening degree of the valve, which is the first pressure control means, is substantially proportional to the amount of change in the pressure in the pressure vessel caused by the change in the valve opening degree. The pressure in the pressure vessel is controlled in the state set in the valve opening range.

[0023]

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

In the drawings used in the description of the following embodiments, the same parts as those in FIG. 5 are denoted by the same reference numerals, and redundant description will be avoided.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the first embodiment is applied.

That is, the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied is different from the conventional pressurized solid electrolyte fuel cell system shown in FIG. It has a configuration in which a valve opening measuring device 8, a control device 9, and a pressure control valve 10 are added.

The valve opening measuring device 8 measures the valve opening of the pressure control valve 4 and outputs the measurement result to the control device 9.

Based on the measurement result of the valve opening of the pressure control valve 4 measured by the valve opening measuring device 8, the control device 9
A control operation for controlling the internal pressure of the pressure vessel 3 is performed. Specifically, a control operation is performed such that the valve opening of the pressure control valve 10 is adjusted to an intermediate opening range to control the internal pressure of the pressure vessel 3 by adjusting the valve opening of the pressure control valve 10. .

Further, the control device 9 sets the valve opening of the pressure control valve 4 to an intermediate opening range and adjusts the valve opening of the pressure control valve 10 based on the result of the control calculation.

The pressure control valve 10 is interposed between the pressure control valve 4 and the discharge container 5, and adjusts the valve opening based on control information from the control device 9.

Next, the operation of the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment configured as described above is applied will be described.

The fuel H pressurized and filled in the gas container 1
₂ (hydrogen) gas, N ₂ (nitrogen) gas as a reaction diluent,
The air, which is an oxidizing agent, is supplied to the pressure vessel 3 with its flow rate controlled by the flow controller 2.

A solid electrolyte fuel cell (not shown) is installed inside the pressure vessel 3, and in this solid electrolyte fuel cell, a pressurized gas supplied to the pressure vessel 3 is used to cause an exothermic reaction. Thermal energy caused by the exothermic reaction is recovered by a heat exchange means (not shown).

The gas generated by the exothermic reaction and the gas not used in the exothermic reaction are discharged from the pressure vessel 3 via the pressure control valve 4 as pressure gas.
It is discharged to the discharge container 5 side.

On the other hand, the internal pressure of the pressure vessel 3 is measured by the pressure measuring device 6, and the measurement result is input to the control device 7.

In the control device 7, control calculation is performed based on the internal pressure measured by the pressure measuring device 6, and the valve opening of the pressure control valve 4 is adjusted based on the control calculation result. Thereby, the internal pressure of the pressure vessel 3 is controlled.

The valve opening of the pressure control valve 4 at this time is
It is measured by the valve opening measuring device 8 and the measurement result is output to the control device 9.

Based on the measurement result of the opening degree of the pressure control valve 4, a control operation for controlling the internal pressure of the pressure vessel 3 is performed by the control device 9, and based on the result of the control operation. The valve openings of the pressure control valve 4 and the pressure control valve 10 are adjusted. In this case, the valve opening of the pressure control valve 4 is set in an intermediate opening range.

As described above, in this embodiment, since the two pressure control valves, ie, the pressure control valve 4 and the pressure control valve 10, are used, the control gain of the pressure control valve 4 is set to be high.
The control gain of the pressure control valve 10 can be set low. As a result, the control pressure controlled by the pressure control valve 10 and the control pressure controlled by the pressure control valve 4 do not interfere with each other, so that the two pressure control valves 4 and 10 can be finely adjusted by appropriately adjusting them. Pressure control is also possible.

The exhaust gas discharged from the pressure vessel 3 side is taken into the discharge vessel 5 via the pressure control valve 4 and the pressure control valve 10, and the discharge port (not shown) of the discharge vessel 5 is appropriately opened. It is discharged from the discharge container 5 to the outside.

As described above, in the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied, the pressure control valve 4 The internal pressure of the pressure vessel 3 can be controlled in a state where the valve opening is adjusted to the intermediate opening range. This intermediate opening region is a region of the valve opening suitable for controlling the flow rate because the change amount of the valve opening and the change amount of the flow rate caused by the change of the valve opening are almost proportional. That is, the pressure control valve 4
, High flow controllability is maintained.

As a result, in the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied, the pressure control valve 4 controls the entire flow from a high flow rate to a low flow rate. Thus, the control of the gas flow rate discharged from the pressure vessel 3 is facilitated, and
The internal pressure of the pressure vessel 3 can be easily controlled.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which a pressure control method for a pressurized solid electrolyte fuel cell system according to a second embodiment is applied.

That is, the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied is the pressurized solid electrolyte fuel cell system according to the first embodiment shown in FIG. The battery system has a configuration in which the valve opening measuring device 8 is omitted and a differential pressure measuring device 11 is added.

The differential pressure measuring device 11 calculates the difference (differential pressure) between the pressure on the upstream side of the pressure control valve 4 and the pressure on the downstream side of the pressure control valve 4.
And outputs the measurement result to the control device 9. The pressure on the upstream side of the pressure control valve 4 refers to the pressure vessel 3 and the pressure control valve 4.
Pressure in the region between Also, the pressure control valve 4
Is a pressure in a region between the pressure control valve 4 and the pressure control valve 10.

The control device 9 performs a control operation for controlling the internal pressure of the pressure vessel 3 based on the differential pressure measured by the differential pressure measuring device 11. Specifically, with the valve opening of the pressure control valve 4 being in the intermediate opening range, the valve opening of the pressure control valve 10 is adjusted, and the differential pressure between the upstream side and the downstream side of the pressure control valve 4 is adjusted. Is performed so as to be constant.

Further, the control device 9 sets the valve opening of the pressure control valve 4 to an intermediate opening range and adjusts the valve opening of the pressure control valve 10 based on the result of the control calculation.

Next, the operation of the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment configured as described above is applied will be described.

The flow rate of the H ₂ (hydrogen) gas as a fuel, the N ₂ (nitrogen) gas as a reaction diluent, and the air as an oxidant, which are filled under pressure in the gas container 1, are controlled by a flow controller 2. And supplied to the pressure vessel 3.

A solid electrolyte fuel cell (not shown) is installed inside the pressure vessel 3, and in this solid electrolyte fuel cell, a pressurized gas supplied to the pressure vessel 3 is used to cause an exothermic reaction. Thermal energy caused by the exothermic reaction is recovered by a heat exchange means (not shown).

The gas generated by the exothermic reaction and the gas not used in the exothermic reaction are discharged from the pressure vessel 3 via the pressure control valve 4 as pressure gas.
It is discharged to the discharge container 5 side.

On the other hand, the internal pressure of the pressure vessel 3 is measured by the pressure measuring device 6, and the measurement result is input to the control device 7. Based on the internal pressure measured by the pressure measuring device 6, the control device 7 adjusts the valve opening of the pressure control valve 4. Thereby, the internal pressure of the pressure vessel 3 is controlled.

At this time, the differential pressure between the upstream side and the downstream side of the pressure control valve 4 is measured by the differential pressure measuring device 11, and the measurement result is output to the control device 9.

The control device 9 performs control calculations for controlling the internal pressure of the pressure vessel 3 based on the measured differential pressure. The valve opening of the pressure control valve 10 is adjusted based on the result of this control calculation. In this case, the valve opening of the pressure control valve 4 is set in an intermediate opening range.

As described above, in this embodiment, since the two pressure control valves, ie, the pressure control valve 4 and the pressure control valve 10, are used, the control gain of the pressure control valve 4 is set high, It is possible to set the control gain of 10 low. As a result, the control pressure controlled by the pressure control valve 10 and the control pressure controlled by the pressure control valve 4 do not interfere with each other, so that the two pressure control valves 4 and 10 can be finely adjusted by appropriately adjusting them. Pressure control is also possible.

The exhaust gas discharged from the pressure vessel 3 side is taken into the discharge vessel 5 via the pressure control valve 4 and the pressure control valve 10, and the discharge port (not shown) of the discharge vessel 5 is appropriately opened. It is discharged from the discharge container 5 to the outside.

As described above, in the pressurized solid electrolyte fuel cell system to which the pressure control method for the pressurized solid electrolyte fuel cell system according to the present embodiment is applied, the pressure control valve 4 By adjusting the valve opening of the pressure control valve 10 in a state where the valve opening is adjusted to the intermediate opening range, the differential pressure between the upstream and downstream of the pressure control valve 4 is maintained constant. In other words, even when the pressure difference between the upstream and downstream of the pressure control valve 4 changes, the pressure control valve 1 is maintained while the valve opening of the pressure control valve 4 is maintained in the intermediate opening range.
It can be adjusted to keep the differential pressure constant using only zero.

That is, in the present embodiment, similar to the first embodiment, the same effects as in the first embodiment can be achieved while maintaining the high flow controllability of the pressure control valve 4.

Further, in general, the differential pressure measuring device 11
The present embodiment can be reduced in cost in addition to the first embodiment because it is cheaper than the valve opening measuring device 8 used in the second embodiment.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which a pressure control method for a pressurized solid electrolyte fuel cell system according to a third embodiment is applied.

That is, the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied includes a fuel line F and a non-fuel line N. .

The non-fuel line N is a reaction diluent N
₂ A non-fuel gas container 1a is filled with (nitrogen) gas and oxidant air under pressure. Non-fuel gas container 1a
The flow rate of the pressurized gas filled in the pressure vessel 2 is controlled by the flow rate controller 2 so as to be supplied to the pressure vessel 3. The configuration of the non-fuel system line N is the same as the system configuration diagram shown in FIG. 2 except that the gas container 1 in the system configuration diagram shown in FIG. 2 is replaced with the above-described non-fuel gas container 1a. Here, duplicate description is avoided.

[0066] On the other hand, fuel system line F is a fuel _{H 2}
A fuel container 1b is filled with (hydrogen) gas under pressure. The flow rate of the fuel gas charged into the fuel container 1b under pressure is controlled by the flow controller 2 ', and the fuel gas is supplied to the pressure container 3 via the differential pressure measuring device 11'. In the configuration of the fuel system line F, the gas container 1 in the system configuration diagram shown in FIG. 1 is replaced with the above-described fuel container 1b, the pressure measuring device 6 is replaced with the above-described differential pressure measuring device 11 ′, and the pressure container 3 is replaced with the pressure container 3. It is the same as the system configuration diagram shown in FIG. 1 except that it is provided on the downstream side of the differential pressure measuring device 11 '.

The differential pressure measuring device 11 ′ measures the differential pressure between the pressure of the fuel gas in the fuel pipe P and the internal pressure of the pressure vessel 3 and outputs it to the control device 7 ′.

The control device 7 'performs a control operation for controlling the fuel gas introduction pressure based on the differential pressure, and adjusts the valve opening of the pressure control valve 4' based on the control operation result. .

The flow controller 2 ′ in the fuel system line F,
The pressure control valve 4 ', the discharge container 5', the valve opening measuring device 8 ', the control device 9', and the pressure control valve 10 'are respectively a flow controller 2, a pressure control valve 4, a discharge container 5, It is the same as the valve opening measuring device 8, the control device 9, and the pressure control valve 10. Therefore, a duplicate description of these will be avoided here.

Next, the operation of the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment configured as described above is applied will be described.

In the pressurized solid electrolyte fuel cell system according to the present embodiment, in the non-fuel system line N, the gas (oxidizing agent and diluent) supplied from the non-fuel gas container 1a is used in the second embodiment. The flow rate is easily controlled by the same operation as that described in the embodiment.

On the other hand, in the fuel system line F, the flow rate of the fuel gas supplied from the fuel container 1b is easily controlled by the same operation as that described in the first embodiment.

Therefore, the pressure difference between the gas (oxidizing agent and diluent) supplied from the non-fuel gas container 1a and the fuel gas supplied from the fuel container 1b can be easily controlled.

In the pressurized solid electrolyte fuel cell system of the type shown in each embodiment of the present invention, the differential pressure between the fuel gas and the gas (oxidizing agent and diluent) other than the fuel introduced into the pressure vessel 3 is measured. When the pressure is within 100 Pa, the reaction efficiency increases.

In the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied, the gas (oxidizing agent and diluent) supplied from the non-fuel gas container 1a and Since the pressure difference between the fuel gas supplied from the fuel container 1b and the fuel gas supplied from the fuel container 1b can be easily controlled, it is possible to control the pressure difference within a range of several hundred Pa, thereby improving the reaction efficiency.

(Fourth Embodiment) A fourth embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which a pressure control method for a pressurized solid electrolyte fuel cell system according to a fourth embodiment is applied.

That is, the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied is the pressurized solid electrolyte fuel cell system according to the first embodiment shown in FIG. Of the battery system,
The internal pressure value of the pressure vessel 3 measured by the pressure measuring device 6 is output to both the control device 7 and the control device 9. Further, the control device 9 controls the valve opening measurement device 8
The control operation for controlling the internal pressure of the pressure vessel 3 is performed by using not only the valve opening measured by the above-described method but also the internal pressure value output from the pressure measuring device 6, and based on the result of the control operation. The valve opening of the pressure control valve 10 is adjusted while the valve opening of the pressure control valve 4 is set in the intermediate opening range.

The other configuration is the same as that described in the first embodiment, and the description thereof will not be repeated.

Next, the operation of the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment configured as described above is applied will be described.

The flow rate of the H ₂ (hydrogen) gas as a fuel, the N ₂ (nitrogen) gas as a reaction diluent, and the air as an oxidant, which are filled into the gas container 1 under pressure, are controlled by a flow controller 2. And supplied to the pressure vessel 3.

A solid electrolyte fuel cell (not shown) is installed inside the pressure vessel 3. In this solid electrolyte fuel cell, a pressurized gas supplied to the pressure vessel 3 is used to cause an exothermic reaction. Thermal energy caused by the exothermic reaction is recovered by a heat exchange means (not shown).

The gas generated by the exothermic reaction and the gas not used in the exothermic reaction are discharged from the pressure vessel 3 via the pressure control valve 4 through the pressure control valves 10 and 10 as exhaust gas.
It is discharged to the discharge container 5 side.

On the other hand, the internal pressure of the pressure vessel 3 is measured by the pressure measuring device 6, and the measurement result is input to the control device 7 and the control device 9.

In the control device 7, control calculations are performed based on the internal pressure measured by the pressure measuring device 6, and the valve opening of the pressure control valve 4 is adjusted based on the control calculation results. Thereby, the internal pressure of the pressure vessel 3 is controlled.

The valve opening of the pressure control valve 4 at this time is
It is measured by the valve opening measuring device 8 and the measurement result is output to the control device 9.

The control device 9 performs a control operation based on the pressure value measured by the pressure measurement device 6 and the valve opening measured by the valve opening measurement device 8, and performs pressure control based on the control operation result. With the valve opening of the valve 4 set in the intermediate opening range, the valve opening of the pressure control valve 10 is adjusted.

As described above, the control device 9 uses not only the valve opening of the pressure control valve 4 measured by the valve opening measuring device 8 but also the pressure value of the pressure vessel 3 measured by the pressure measuring device 6. Since the control calculation is performed, even if there is a change in the internal pressure of the pressure vessel 3 due to some event, the change can be directly reflected in the control calculation. , Control responsiveness can be improved.

That is, in the case of the first embodiment, since only the valve opening of the pressure control valve 4 measured by the valve opening measuring device 8 is inputted, the controller 9 controls the internal pressure of the pressure vessel 3. Is reflected secondarily through a change in the valve opening of the pressure control valve 4 adjusted in accordance with the pressure change, so that the pressure is measured by the pressure measuring device 6. A time delay occurs in the control as compared with the present embodiment in which the pressure value thus applied can be directly reflected in the control calculation.

As described above, in the pressurized solid electrolyte fuel cell system to which the pressure control method of the pressurized solid electrolyte fuel cell system according to the present embodiment is applied, the first embodiment is performed by the above-described operation. Control responsiveness can be further improved in addition to the effects achieved by the embodiment.

As a result, even when the pressure is rapidly and largely changed, the follow-up control can be performed promptly.

As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to such configurations. Within the scope of the technical idea described in the claims, those skilled in the art can come up with various modified examples and modified examples, and these modified examples and modified examples are also within the technical scope of the present invention. It is understood that it belongs to.

[0093]

As described above, according to the method for controlling the pressure of the pressurized solid electrolyte fuel cell system of the present invention, the flow rate of the gas discharged from the pressure vessel can be easily controlled. A pressure control method for a pressurized solid electrolyte fuel cell system excellent in controllability of the internal pressure of the container can be realized.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which a pressure control method for a pressurized solid electrolyte fuel cell system according to a first embodiment of the present invention is applied.

FIG. 2 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which a pressure control method for a pressurized solid electrolyte fuel cell system according to a second embodiment of the present invention is applied.

FIG. 3 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which a pressure control method for a pressurized solid electrolyte fuel cell system according to a third embodiment of the present invention is applied.

FIG. 4 is a system configuration diagram showing an example of a pressurized solid electrolyte fuel cell system to which a pressure control method for a pressurized solid electrolyte fuel cell system according to a fourth embodiment of the present invention is applied.

FIG. 5 is a system configuration diagram of a conventionally used pressurized solid electrolyte fuel cell system.

FIG. 6 is a characteristic diagram showing a general relationship between a valve opening degree of a pressure control valve and a flow rate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gas container, 1a ... Non-fuel gas container, 1b ... Fuel container, 2 ... Flow controller, 3 ... Pressure container, 4, 10 ... Pressure control valve, 5 ... Discharge container, 6 ... Pressure measuring device, 7, 9 ... Control device, 8 ... Valve opening degree measuring device, 11 ... Differential pressure measuring device.

Claims (7)

[Claims] 1. A pressure control method for a pressurized solid electrolyte fuel cell system for controlling a pressure in a pressurized pressure vessel in which a solid electrolyte fuel cell is installed, wherein a first pressure in the pressure vessel is measured. Pressure measurement means, first control calculation means for performing control calculation for controlling the pressure in the pressure vessel based on the pressure measured by the first pressure measurement means, and first control calculation First pressure control means for controlling the pressure in the pressure vessel based on the result of the control operation performed by the means, and first control means for obtaining control state information of the first pressure control means.
State obtaining means, and second control calculating means for performing control calculation for controlling the pressure in the pressure vessel based on the control state information obtained by the first state obtaining means, Pressure control means for controlling the pressure in the pressure vessel based on the result of the control calculation performed by the control calculation means. 2. The pressure control method for a pressurized solid electrolyte fuel cell system according to claim 1, wherein said second control operation means includes a pressure measured by said first pressure measurement means and a predetermined pressure. Is larger than a predetermined value, the pressure in the pressure vessel based on the pressure measured by the first pressure measuring means and the control state information acquired by the first state acquiring means. A pressure control method for a pressurized solid electrolyte fuel cell system, wherein a control operation for controlling pressure is performed. 3. The pressure control method for a pressurized solid electrolyte fuel cell system according to claim 1, wherein fuel used for the solid electrolyte fuel cell installed inside the pressure vessel is supplied to the pressure vessel. A second pressure measuring means for measuring a differential pressure between the introduced pressure introduced and the pressure in the pressure vessel; and controlling the introduced pressure based on the differential pressure measured by the second pressure measuring means. Of the third control operation
Control operation means, and third pressure control means for controlling the introduction pressure based on the result of the control operation performed by the third control operation means; and control state information of the third pressure control means. Second to get
A fourth control calculating means for performing a control calculation for controlling the third pressure control means based on the control state information obtained by the second state obtaining means; Pressure control means for controlling the third pressure control means based on the result of the control calculation performed by the control calculation means. Method. 4. The pressure control method for a pressurized solid electrolyte fuel cell system according to claim 1, wherein the first pressure control means is a valve, and the first state acquisition is performed. The pressure control method for a pressurized solid electrolyte fuel cell system, characterized in that the means acquires a valve opening degree of a valve, which is the first pressure control means, as control state information of the first pressure control means. 5. The pressure control method for a pressurized solid electrolyte fuel cell system according to claim 1, wherein the first pressure control means includes a pressure vessel and the second pressure. A valve provided between the first pressure control unit and the first pressure control unit as a control state information of the first pressure control unit. A pressure control method for a pressurized solid electrolyte fuel cell system, characterized by acquiring differential pressure data between the pressure of the second pressure control means and the pressure of the second pressure control means. 6. The pressure control method for a pressurized solid electrolyte fuel cell system according to claim 5, wherein the second pressure control means is a pressure on the pressure vessel side of a valve which is the first pressure control means. Controlling the pressure in the pressure vessel such that the pressure difference between the pressure and the pressure on the second pressure control means side is substantially constant. 7. The pressure control method for a pressurized solid electrolyte fuel cell system according to claim 4, wherein said second pressure control means is said first pressure control means. The valve opening of the valve is set in a valve opening region where the amount of change in the valve opening and the amount of change in pressure in the pressure vessel caused by the change in the valve opening are in a substantially proportional relationship. A pressure control method for a pressurized solid electrolyte fuel cell system, wherein the pressure in the pressure vessel is controlled in a state.