JP2916289B2 - Control unit for fuel cell power generation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a fuel cell power generation system including a reformer and a fuel cell.

[0002]

2. Description of the Related Art Generally, a reformer of a fuel cell power generation system is roughly classified into a process side and a burner side. On the process side, raw fuel mixed with reforming steam is introduced into the inside of a reforming tube provided with a reforming catalyst layer inside. On the other hand, on the burner side, in order to supply thermal energy for reforming the fuel gas on the process side, combustion fuel and combustion air are burned by the burner in the combustion chamber, and the high-temperature combustion gas obtained here is reformed. It is circulated outside the quality tube.

FIG. 10 is a block diagram showing an example of a conventional nitrogen supply control to a process side and a burner side of a reformer in a pressure increasing process of a plant. Fuel cell 1
Comprises an oxidizer electrode 2 and a fuel electrode 3, to which nitrogen is supplied from a nitrogen supply source via an on-off valve 4 and an on-off valve 5 provided on the inlet side. In the pressure increasing process, the supply control valve 6 for supplying the reformed gas to the fuel electrode 3 is closed. That is, the burner 8 side of the reformer 7 and the process 9 side of the reformer 7 are completely separated.

With such a configuration, the boosting of the burner 8 is
The operation is performed by opening the on / off valve 4 and the on / off valve 5 respectively. Here, the opening command value b to the on / off valve 4 for supplying nitrogen to the oxidant electrode 2 is, for example, a pressure detector 10
Pressure detection value a on the reformer burner side detected by
Is set by the opening command function setting device 11 based on The opening command value c for the on / off valve 5 for supplying nitrogen to the fuel electrode 3 is similarly set by the opening command function setting unit 12 based on the representative pressure detection value a on the reformer burner side.

On the other hand, the pressure increase on the process 9 side of the reformer 7 is based on the representative pressure detection value d on the reformer process side detected by the pressure detector 13 and the opening command function setting unit 14
To give the opening command value e to the on / off valve 15. The opening command function setting device 11 and the opening command function setting device 12 output the close signal when the representative pressure detection value a on the reformer burner side is equal to or higher than the pressure setting value p1, and output the closing signal when the representative pressure detection value a is equal to or higher than the pressure setting value p1. Outputs open signal. The opening command function setting unit 14 outputs a close signal when the representative pressure detection value d on the reformer process side is equal to or higher than the pressure set value p2, and outputs an open signal when the representative pressure detection value d is lower than the pressure set value p2.

[0006]

However, the conventional control device described above has the following problems. That is, for example, an unexpected leak may occur on the process 9 side of the reformer 7 due to a leak from equipment or piping or forgetting to close a valve at the time of inspection. For example, as in the pressure response shown in FIG. 11A, the process-side pressure PP1 when there is no leak at time t0 increases, but the process-side pressure PP2 when there is a leak increases very slowly,
Alternatively, the pressure may not be increased. In this state, when the burner side pressure PB1 of one of the reformers 7 rises as usual as shown in FIG.
As shown in FIG. 11B, an excessive pressure difference f (hereinafter, a pressure difference between the process side and the burner side is referred to as “internal / external pressure difference”) as shown in FIG. ) May occur, and the pressure on the burner 8 side may be higher than that on the process 9 side of the reformer 7 and may be in a reverse pressure state. FIG. 11B
In the example, the maximum back pressure is at time t1, and the differential pressure is zero at time t2. Therefore, the opening degree command c to the on / off valve 5 for supplying nitrogen to the fuel electrode 3 keeps the opening signal as shown in FIG.

Generally, in a fuel cell power plant, comprehensive test adjustment (hereinafter referred to as “pack test”) is performed before installing a fuel cell. At the time of the pack test, the fuel cell is not installed. For this reason, the volume of the reformer 7 on the burner 8 side is reduced as compared with the normal time, and it becomes remarkable that the pressure rising speed on the burner 8 side becomes faster than that on the process 9 side. In some cases, a back pressure may be generated between the inside and outside pressure difference of the pressure sensor 7. When such an excessive pressure difference between the inside and outside of the reformer 7 is generated, particularly when the pressure on the burner 8 side of the reformer 7 is higher than the pressure on the process 9 side of the reformer 7, the pressure is slightly reduced. Even a slight differential pressure may cause fatal damage to the reformer 7.

The above problem is caused by the fact that the pressure on the process 9 side and the burner 8 side of the reformer 7 are independently performed. Therefore, in the conventional control device, it was necessary to prevent the occurrence of an excessively large differential pressure between the inside and outside of the reforming device 7 due to the difference in the boosting speed due to an unexpected change in plant conditions.

In view of the above, the present invention provides a control device for a fuel cell power generation system which prevents an excessive pressure difference between a process side and a burner side of a reformer in a pressure increasing process of a plant. With the goal.

[0010]

According to the first aspect of the present invention, a reformer comprising a process for producing a reformed gas from a raw fuel gas such as natural gas and a burner, and a reformer obtained by the reformer are provided. In order to introduce a reformed gas into the fuel electrode and introduce an oxidizing gas such as air into the oxidizing electrode to generate electric energy by an electrochemical reaction, and to boost the pressure of the reforming device and the fuel cell First and second gas from an inert gas supply source such as nitrogen to the process side and the burner side of the reformer.
In a control device of a fuel cell power generation system provided with an inert gas supply line for supplying an inert gas through a control valve, a value corresponding to a pressure difference between a process side and a burner side of a reformer is detected. A first means provided on the process side until the pressure exceeds a predetermined value so as to precedely increase the pressure based on the detection value from the detection means when the pressure of the reformer and the fuel cell is increased.
First inert gas supply control means for controlling the opening of the control valve, and the burner side so as to follow the pressure increase on the process side based on the detection value from the detection means when the reformer and the fuel cell are boosted. And second inert gas supply control means for controlling the degree of opening of the second control valve provided in the apparatus. Further, the invention of claim 2 provides a reformer comprising a process for producing a reformed gas from a raw fuel gas such as natural gas and a burner, and a reformed gas obtained by the reformer being supplied to a fuel electrode. A fuel cell that introduces an oxidizing gas such as air into the oxidizing electrode and generates electric energy by an electrochemical reaction, and an inert gas such as nitrogen for increasing the pressure of the reformer and the fuel cell. In a control device of a fuel cell power generation system provided with an inert gas supply line for supplying an inert gas from a supply source to a process side and a burner side of the reformer via first and second control valves, A plurality of inert gas supply lines or at least one of the inert gas supply lines on the burner side, a third control valve provided on the line, a process side and a burner side of the reformer; Detecting means for detecting the pressure difference between the control means and the opening degree of each control valve based on the detected value of the detecting means to maintain the process side and the burner side of the reformer within a predetermined pressure difference. And an inert gas supply control means for increasing the pressure and changing the operation timing of each control valve when the reformer and the fuel cell are pressurized. Further, the invention of claim 3 provides a reformer comprising a process for producing a reformed gas from a raw fuel gas such as natural gas and a burner, and a reformed gas obtained by the reformer being supplied to a fuel electrode. Introducing,
A fuel cell, which introduces oxidizing gas such as air into the oxidizing electrode to generate electric energy by an electrochemical reaction, and an inert gas supply source, such as nitrogen, for boosting the pressure of the reformer and the fuel cell. A fuel cell power generation system having an inert gas supply line for supplying an inert gas to the process side and the burner side of the reforming device via the first and second control valves. A value corresponding to the pressure difference from the burner side is detected from the differential pressure across the control valve that supplies reformed gas to the fuel electrode of the fuel cell from the process side of the reformer and the reformer when the pressure of the fuel cell is increased. And an inactive pressure increasing step while maintaining the process side and the burner side of the reformer within a predetermined pressure difference by controlling the opening of each control valve based on the detection value of the detecting means. Gas supply control means It is obtained as provided.

[0011]

According to the above configuration, the generation of an excessive pressure difference between the process side and the burner side of the reformer is suppressed. In addition, the pressure rise rate on the process side and the burner side of the reformer at the time of pressure rise can be increased in cooperation.

[0012]

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

FIG. 1 is a block diagram of a control device of a fuel cell power generation system according to a first embodiment of the present invention. The same reference numerals as those in FIG. 10 indicate the same or corresponding parts. The main difference from FIG. 10 is that the on / off valve 4 for supplying nitrogen to the oxidant electrode 2 and the opening command function setting device 11 are eliminated. Further, instead of the pressure detector 10, the differential pressure detector 1
6, the opening command function setting device 17 and the on / off valve 15 are replaced with the opening command function setting device 12 for the on / off valve 5.
An opening command function setting device 18 is provided in place of the opening command function setting device 14.

In this embodiment, the pressure of the burner 8 of the reformer 7 is increased by the nitrogen supply means provided at the inlet of the fuel electrode 3, while the nitrogen supply means provided at the inlet of the process 9 is used. The pressure on the process 9 side of the reformer 7 is increased.

In this embodiment, the pressure difference between the inside and outside of the reformer 7 is detected by a differential pressure detector 16 as a step-up control means on the burner 8 side of the reformer 7, and the difference between the inside and outside of the reformer 7 is detected. The opening command function setting device 17 gives the opening command value c to the on / off valve 5 based on the detection value f (the detection value of the difference between the pressure on the process side and the pressure on the burner side).

On the other hand, as the step-up control means on the process 9 side of the reformer 7, the opening command function setting unit 18 gives the opening command value e of the on / off valve 15 based on the detected pressure difference f between the inside and outside of the reforming device. I have to.

Here, the differential pressure detector 16 detects the differential pressure between the process 9 side and the burner 8 side of the reformer 7 as described above.
The detected value f of the pressure difference between the inside and outside of the reformer is used as an opening command function setting device 1
7 and the opening command function setting device 18. The opening degree command function setting device 17 and the opening degree command function setting device 18 output a function value having hysteresis, for example, as shown in FIG. That is, the opening degree command function setting unit 17 outputs a close signal when the differential pressure detection value f between the inside and outside of the reformer is equal to or less than the differential pressure set value ΔP1, and the detected value f inside and outside the reformer is equal to or more than the differential pressure set value ΔP2. Outputs an open signal. The opening degree command function setting unit 18 outputs an open signal when the reformer internal / external differential pressure detection value f is equal to or less than the differential pressure set value ΔP3, and outputs the reformer internal / external differential pressure detected value f to the differential pressure set value Δ
A close signal is output at P4 or higher.

The operation of the above arrangement will be described with reference to FIG.
The control valve 6 for supplying the reformed gas is closed and the on / off valve 15
Is open. Further, the on / off valve 5 for supplying nitrogen to the fuel electrode 3 has a difference pressure detection value f between the inside and outside of the reformer that is equal to the differential pressure set value Δ.
Closed because it is below P2. In such a state, for example, the process side pressure PP when there is no leak at time t0
1 rises as indicated by the pressure response shown in FIG.

By the way, for example, at this time, the reformer 7
For example, when a leak occurs on the process 9 side, the pressure increasing speed on the process 9 side becomes slow and may change like the process side pressure PP2 shown in FIG. In such a case, nitrogen is supplied only to the process 9 side of the reformer 7, and as shown in the response of the differential pressure detection value f between the inside and outside of the reformer shown in FIG. When the inside / outside differential pressure detection value f becomes equal to or larger than the differential pressure set value ΔP2 at the time point t1, the on / off valve 5 opens as shown in the response of the opening command value c of the on / off valve 5 shown in FIG. As a result, nitrogen is supplied from the nitrogen supply source, and the reformer-burner-side pressure PB1 starts increasing,
The differential pressure detection value f inside and outside the reformer gradually decreases.

Next, when the differential pressure detected value f between the inside and outside of the reformer becomes equal to or less than the differential pressure set value ΔP1, the on / off valve 5 closes at time t2. Due to the closing operation of the on / off valve 5, the reformer burner side pressure PB1 does not change until time t3. However, since the reformer process side pressure PP1 rises, the reformer inside / outside differential pressure detection value f rises again, and at time t3, the reformer inside / outside differential pressure detection value f becomes equal to or greater than the differential pressure set value ΔP2,
The on / off valve 5 is opened. Therefore, the reformer burner side pressure PB1 increases, and accordingly, the detected value f of the pressure difference between the inside and outside of the reformer decreases again. In this way, as shown in FIG. 2C, the opening / closing operation of the on / off valve 5 based on the opening command value c is repeated in the step-up process even after time t3. In the example shown in FIG. 2, the detected differential pressure f between the inside and outside of the reformer at each time point of t2, t4, t6, and t8 is ΔP1, and the value is zero. It can be controlled with a predetermined value.

As described above, a leak occurs on the process side of the reformer at the time of pressurization, and even if the rate of pressure increase on the process side of the reformer is lower than that on the burner side of the reformer, the pressure on the burner side of the reformer becomes lower. The change in the pressure increase rate on the process side is regarded as the change in the differential pressure between the inside and outside of the reformer, and the supply of nitrogen to the burner side and the process side of the reformer is turned on and off based on the detected value of the differential pressure inside and outside the reformer. Control. Therefore, even if an unexpected change in plant conditions occurs, the pressure can be increased while maintaining the differential pressure inside and outside the reformer satisfactorily.

FIG. 3 is a block diagram of a control device of a fuel cell power generation system according to a second embodiment of the present invention.

In the second embodiment, the pressure on the burner 8 side of the reformer 7 is increased in addition to the nitrogen supply means provided at the inlet of the fuel electrode 3 in the first embodiment, and the inlet of the oxidizer electrode 2 is further added. In that it is performed by a nitrogen supply means provided in the above. For this purpose, in addition to the configuration of the first embodiment, an on / off valve 4 for supplying nitrogen to the oxidant electrode 2 and an opening command function setting device 19 are provided.

In the control of the second embodiment, in addition to the control of the first embodiment, the pressure increase on the burner 8 side of the reformer 7 sets the opening command function based on the detected differential pressure f between the inside and outside of the reformer. The opening command value b is given to the on / off valve 4 by the heater 19.

The opening degree command function setting unit 19 is, for example, as shown in FIG.
As shown in the figure, a closed signal is output when the differential pressure detection value f inside and outside the reformer is equal to or less than the differential pressure set value ΔP5 with a function output having hysteresis, and the differential pressure detected value f inside and outside the reformer is set to the differential pressure set value. An open signal is output when ΔP6 or more. Opening command function setting device 1
Reference numeral 7 denotes a function output having hysteresis, as shown in FIG. 3, which outputs a closing signal when the differential pressure detection value f between the inside and outside of the reformer is equal to or less than the differential pressure set value ΔP7. Output an open signal when the differential pressure set value ΔP8 or more. by the way,
Opening command function setting device 19 and opening command function setting device 17
The differential pressure setting values ΔP5, ΔP6, ΔP7, and ΔP8 are different from each other, for example, as shown in FIG. 4, and the opening / closing operation timing of the on / off valve 4 and the on / off valve 5 is shifted. I have. The opening command function setting device 18
As shown in FIG. 3, is a function output having hysteresis, and outputs an open signal when the differential pressure detection value f inside and outside the reformer is equal to or less than the differential pressure set value ΔP9, while the differential pressure detection value f inside and outside the reformer is A close signal is output when the fuel electrode nitrogen supply on / off valve opening differential pressure set value ΔP10 or more.

With the above configuration, in the pressure increasing process, the control valve 6 for supplying the reformed gas to the fuel electrode 3 is closed, and the on / off valve 15 is opened. Further, the on / off valve 5 is closed until the detected differential pressure f between the inside and outside of the reformer reaches the differential pressure set value ΔP8 or more, and the on / off valve 4 is closed until the differential pressure set value ΔP6. First, as shown in FIG. 5 (a), assuming that the pressure is increased from the time t0, the reforming apparatus 7 when there is no leak at the time t0.
Process side pressure PP1 rises. However, for example, when a leak occurs on the process side, the pressure increase speed on the process side is slowed down, and may change like the process side pressure PP2. Explaining such a case, the burner side pressure PB1 until the time point t1 is as shown in FIG.
As shown in FIG.

In this state, nitrogen is supplied only to the process 9 side of the reformer 7, and the detected pressure difference f between the inside and outside of the reformer is changed to the difference between the inside and outside of the reformer shown in FIG. As shown in the response of f, when the pressure difference becomes equal to or greater than the differential pressure set value ΔP8, the on / off valve 5 opens at time t1, as indicated by the opening command value response c of the on / off valve 5 shown in FIG. As a result, the reformer burner side pressure PB1 increases from the time point t1, and the rate of increase of the detected value f of the pressure difference between the inside and outside of the reformer slightly decreases as shown in FIG.

Thereafter, when the detected value f of the differential pressure between the inside and outside of the reformer becomes equal to or greater than the differential pressure set value ΔP6, as shown in FIG. Performs the opening operation. As a result, the reformer burner side pressure PB1 is further increased by the supply of nitrogen from the two systems of the on-off valve 5 and the on-off valve 4 to the burner 8, while the pressure difference between the inside and outside of the reformer is increased. The detection value f is reduced.

Next, when the detected value f of the differential pressure between the inside and outside of the reformer becomes equal to or less than the set value of the differential pressure ΔP5 at time t3, the on / off valve 4 closes to suppress the decrease in the detected value f of the inside / outside of the reformer. And Even if the on / off valve 4 is closed, the decrease in the differential pressure detection value f between the inside and outside of the reformer cannot be suppressed, and the differential pressure inside and outside the reformer f
Is smaller than the differential pressure set value ΔP7 at time t4, the on / off valve 5 is closed. Further, as shown in FIG.
At time t8, the opening / closing operation of the on / off valve 4 and the on / off valve 5 is repeated during the pressure increasing process.

Thus, the detected differential pressure f
Is suppressed within the range from the differential pressure set value ΔP7 to the differential pressure set value ΔP6.

In this embodiment, for example, even when a leak or the like occurs and the process side pressure PP2 shown in FIG. 5A is reached, the change in the pressure increase rate between the reformer burner side and the process side is detected. The change in the pressure difference between the inside and outside of the apparatus is considered, and the supply of nitrogen to and from the reformer burner side and the process side is controlled based on the detected value f of the inside and outside differential pressure of the reforming apparatus.

Therefore, even if an unexpected change in plant conditions occurs, the pressure can be increased while maintaining the differential pressure inside and outside the reformer satisfactorily. In the second embodiment, a plurality of nitrogen supply means are provided on the reformer burner side, and the opening command value setting functions for the on / off valves 4 and 5 are different from each other as shown in FIG. The operation timing of the element supply means is shifted. For this reason, it is possible to avoid a rapid change in the flow rate to the nitrogen supply system, so that there is an effect of suppressing pressure fluctuation in the nitrogen supply system.

FIGS. 6 to 9 are block diagrams showing the control device of the fuel cell power generation system according to the third to sixth embodiments of the present invention.

In the third embodiment shown in FIG. 6, a control valve 20 is used instead of the on / off valve 5 and the on / off valve 15 of the first embodiment.
And a supply control valve 21. The opening command values for the control valves 20 and 21 are stored in the opening command function setting device 22.
And the opening command function setting device 23.

Here, the opening command value g of the opening command function setting unit 22 is, for example, as shown in FIG. 6, the fully closed signal when the differential pressure detection value f inside and outside the reformer is equal to or less than the differential pressure setting value ΔP11. When the differential pressure detection value f between the inside and outside of the reformer is in the range of not less than the differential pressure set value ΔP11 and not more than the differential pressure set value ΔP12, a constant proportional open signal is provided, and fully opened at the differential pressure set value ΔP12 or more. Like that. On the other hand, as shown in FIG. 6, for example, as shown in FIG. 6, the opening command value h of the opening command function setting unit 23 is a fully open signal when the detected differential pressure f inside and outside the reformer is equal to or less than the differential pressure set value ΔP13. In the range from the value ΔP13 to the differential pressure set value ΔP14, the closed signal is a constant proportional signal, and the fully closed signal is set in the range from the differential pressure set value ΔP14.

The fourth embodiment shown in FIG. 7 includes a control valve 24, a control valve 20, and a control valve 21 in place of the on-off valve 4, on-off valve 5, and on-off valve 15 of the second embodiment shown in FIG. ing. The opening command value i of the opening command function setting unit 25 is a fully closed signal when the detected differential pressure f inside and outside the reformer is equal to or less than the differential pressure set value ΔP15, and the differential pressure set value ΔP1
An open signal of a constant proportionality is set in a range of 5 or more and equal to or less than a differential pressure set value ΔP16, and a fully closed signal is set in a range of not less than the differential pressure set value ΔP16. The opening command function setting device 22 and the opening command function setting device 23 are as described in the third embodiment shown in FIG.
Opening command function setting device 23 and opening command function setting device 25
Are shifted in operation timing as shown in FIG.

In the fifth embodiment shown in FIG. 8, the pressure detection value j of the pressure detector 26 and the pressure detection value of the pressure The detected value k is added by the adder 28 using the illustrated code, and control is performed based on the deviation 1 between the two detected pressure values.

In the sixth embodiment shown in FIG. 9, the state variable corresponding to the differential pressure detection value f between the inside and outside of the reformer of the first embodiment shown in FIG. Differential pressure detection value m
Is detected by the differential pressure detector 29 and controlled.

The above-described third to sixth embodiments are the first and second embodiments in terms of means for supplying nitrogen to the reformer process side and the burner side, setting of valve opening, input signals, and the like. Although the configuration is different from the example, in any of the embodiments, reforming can be performed to correct the change and difference in the pressure increase speed between the process side and the burner side of the reformer due to the change of the plant condition and the operating condition. The plant can be pressurized while maintaining a good differential pressure between the inside and the outside of the apparatus.

[0040]

As described above, according to the present invention, the pressure difference between the process side and the burner side of the reformer is controlled within a predetermined range while increasing the pressure of the reformer at a predetermined speed. be able to. Therefore, it is possible to quickly suppress an excessive change in the pressure increase rate on the process side and the burner side of the reformer due to unexpected changes in plant conditions and operating conditions, and to cooperate the pressure increase on the process side and the burner side of the reformer. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device of a fuel cell power generation system according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a response of a main state quantity in the first embodiment of the device.

FIG. 3 is a block diagram of a control device of a fuel cell power generation system according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an example of the content of an opening command function setting device of the apparatus.

FIG. 5 is an explanatory diagram showing responses of main state quantities in a second embodiment of the device.

FIG. 6 is a block diagram of a control device of a fuel cell power generation system according to a third embodiment of the present invention.

FIG. 7 is a block diagram of a control device of a fuel cell power generation system according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram of a control device of a fuel cell power generation system according to a fifth embodiment of the present invention.

FIG. 9 is a block diagram of a control device of a fuel cell power generation system according to a sixth embodiment of the present invention.

FIG. 10 is a block diagram of a control device of a fuel cell power generation system showing a conventional example.

FIG. 11 is an explanatory diagram showing a response of a main state quantity of the apparatus.

[Explanation of symbols]

 Reference Signs List 1 fuel cell 2 oxidizer electrode 3 fuel electrode 4 on / off valve 5 on / off valve 6 supply control valve 7 reformer 8 burner side 9 process side 15 on / off valve 16 differential pressure detector 17 opening command function setting device 18 opening command function Setting device

Claims (3)

(57) [Claims] 1. A reformer comprising a process for producing a reformed gas from a raw fuel gas such as natural gas and a burner;
A fuel cell that introduces reformed gas obtained by this reformer into a fuel electrode and introduces an oxidant gas such as air into the oxidant electrode to generate electric energy by an electrochemical reaction; Gas supply for supplying an inert gas from an inert gas supply source such as nitrogen to a process side and a burner side of the reformer through first and second control valves in order to boost the pressure of the fuel cell and the fuel cell. A control unit for a fuel cell power generation system including a line, wherein a detecting unit that detects a value corresponding to a pressure difference between a process side and a burner side of the reformer; First inert gas supply control means for controlling to open a first control valve provided on the process side until a predetermined value is exceeded so as to precedently increase the pressure based on a detection value from the detection means; And fuel electricity A second inert gas supply for controlling an opening degree of a second control valve provided on the burner side so as to follow the pressure increase on the process side based on a detection value from the detection means at the time of pressure increase. A control device for a fuel cell power generation system, comprising: control means. 2. A reformer comprising a process for producing a reformed gas from a raw fuel gas such as natural gas and a burner;
A fuel cell that introduces reformed gas obtained by this reformer into a fuel electrode and introduces an oxidant gas such as air into the oxidant electrode to generate electric energy by an electrochemical reaction; Gas supply for supplying an inert gas from an inert gas supply source such as nitrogen to a process side and a burner side of the reformer through first and second control valves in order to boost the pressure of the fuel cell and the fuel cell. In the control device for a fuel cell power generation system including a line, at least one of the inert gas supply line on the process side or the inert gas supply line on the burner side includes a plurality of lines, and 3
A control valve for detecting a pressure difference between a process side and a burner side of the reformer; and controlling the opening degree of each control valve based on a detection value of the detection means to perform the reforming. Inert gas supply control for increasing the pressure while maintaining the process side and the burner side of the apparatus within a predetermined pressure difference, and making the operation timings of the respective control valves different when the reformer and the fuel cell are boosted. And a control device for a fuel cell power generation system. 3. A reformer comprising a process for producing a reformed gas from a raw fuel gas such as natural gas and a burner;
A fuel cell that introduces reformed gas obtained by this reformer into a fuel electrode and introduces an oxidant gas such as air into the oxidant electrode to generate electric energy by an electrochemical reaction; Gas supply for supplying an inert gas from an inert gas supply source such as nitrogen to a process side and a burner side of the reformer through first and second control valves in order to boost the pressure of the fuel cell and the fuel cell. In a control device for a fuel cell power generation system including a line, a value corresponding to a pressure difference between a process side and a burner side of the reformer is processed by the reformer and a process of the reformer when the pressure of the fuel cell is increased. Detecting means for detecting the pressure difference between the front and rear of a control valve for supplying reformed gas to the fuel electrode of the fuel cell from the side, and controlling the degree of opening of each control valve based on a detection value of the detecting means. Reformer unit While maintaining the Seth side and the burner-side within a predetermined pressure difference, the control device of a fuel cell power generation system characterized in that a inert gas supply control means for boosting.