JPH07282828A - Fuel cell power generating system - Google Patents

Abstract

PURPOSE:To maintain a reforming catalyst part in a fuel gas supply device at a desirable temperature even if load variation occurs. CONSTITUTION:A fuel cell power generating system 1 has an output current collector 31 Hall DCCT in addition to use of a fuel gas supply device 4A and a controller 2 to a traditional fuel cell power generating system. The fuel gas supply device 4A has a fuel reformer 41A having a reforming tube 411 in which a reforming catalyst is accommodated and a heating device 412 for supplying a combustion gas for heating the reforming tube 411 to a desirable temperature. The output current detector 31 is installed in an output current passage 92 and outputs a signal 31a corresponding to an output current 9A value. The controller 2 inputs a signal 62a outputted by a flow meter 62 and a signal 31a and outputs a signal 2a corresponding to required air supply amount supplied by an air supply device 8. The air supply device 8 inputs the signal 2a and supplies combustion air 8a whose amount is determined by the signal 2a to the heating device 412.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell power generator, and enables a fuel gas supply device to be stably operated under desired temperature conditions even if the output current value of the fuel cell fluctuates. The present invention relates to an improved fuel cell power generator.

[0002]

2. Description of the Related Art In recent years, fuel cells that directly convert the chemical energy of fuel into electric energy have become known, and their energy recovery efficiency is relatively high compared to other energy institutions. Moreover, the emission of carbon dioxide, nitrogen oxides, and other air pollutants is small, so it is expected as a so-called clean energy source. As the fuel cell, depending on the type of electrolyte used, a solid polymer electrolyte type, phosphoric acid type, molten carbonate type,
Various types of fuel cells such as solid oxide type are already known.

A fuel cell power generator according to a conventional example will be described below mainly for a phosphoric acid fuel cell using phosphoric acid as an electrolyte. FIG. 9 is a block diagram showing a configuration of a main part of a conventional fuel cell power generator together with its load device. In FIG. 9, 9 is a known phosphoric acid fuel cell 4, a fuel gas supply device 4B, an oxidant gas supply device 5, a raw fuel supply pipe 6, and a fuel exhaust gas supply pipe 7 which is a fuel exhaust gas supply means. , The air supply device 8, and the control device 91. The fuel gas supply device 4B includes a fuel reformer 41B and a shift converter 42 that is installed as necessary,
A fuel gas 4a is supplied to a phosphoric acid fuel cell (hereinafter sometimes simply referred to as a fuel cell) 4.

The fuel reformer 41B is a device for reforming a raw fuel 61a such as natural gas, which is supplied from the raw fuel supply pipe 6, by a reforming catalyst to reform into a hydrogen-rich reformed gas 41a. And the reforming pipe 41 containing the reforming catalyst.
1, a heating device 412 for supplying a heating medium for heating the reforming catalyst to a desired temperature, and a temperature detector 413 such as a thermocouple for detecting the temperature of the reforming catalyst. Fuel reformer 41B
Is fed to the reforming pipe 411 heated to a desired temperature.
1a is passed and steam reforming is performed by the reforming catalyst to obtain hydrogen-rich reformed gas 41a. The heating device 412 burns the fuel exhaust gas 7a, which is the exhaust gas of the fuel gas 4a supplied through the fuel exhaust gas supply pipeline 7, with the combustion air 8a supplied from the air supply device 8,
A heating medium as combustion gas is generated to heat the reforming pipe 411.

The shift converter 42 includes a reformed gas 41a.
The reformed gas 41a, which is installed as needed to remove harmful components such as carbon monoxide contained in the fuel cell 4 for the fuel cell 4, and has the harmful components removed by the shift converter 42 Is supplied to the fuel cell 4 as a hydrogen-rich fuel gas 4a. The oxidant gas supply device 5 is a device including a blower or the like that supplies the fuel cell 4 with an oxidant gas 5a such as the atmosphere containing a large amount of oxygen. The raw fuel supply pipe 6 receives the raw fuel 61a from a raw fuel supply source (not shown), and the flow rate adjusting valve 6 as a supply amount adjusting means for adjusting the supply amount of the raw fuel 61a.
1 and a flow meter 62 as a raw fuel supply amount detection device that outputs a signal 62a corresponding to the supply amount of the raw fuel 61a.

As is well known, the phosphoric acid fuel cell 4 has a fuel electrode and a fuel electrode, which are arranged to face each other with a porous electrolyte layer (not shown) containing phosphoric acid as an electrolyte interposed therebetween. A stack of unit fuel cells including an oxidant electrode is provided. The fuel cell 4 configured in this manner allows the fuel gas 4a to flow through the fuel electrode, and the oxidant gas 5
a through an oxidant electrode, and electrochemically reacting hydrogen in the fuel gas 4a with oxygen in the oxidant gas 5a through the electrolyte layer to form a direct current between the fuel electrode and the oxidant electrode. Generate electricity. The fuel gas 4a, which has passed through the fuel electrode and consumes hydrogen for the above reaction, and has a reduced hydrogen concentration, is passed through the fuel exhaust gas supply pipe 7 and recovered as the fuel exhaust gas 7a. In addition, the oxidant gas 5a, which has flowed through the oxidant electrode and consumed oxygen for the above reaction, is discharged to the outside of the fuel cell power generator 9 as the exhaust gas 5b. Further, the output current 9A based on the DC electricity generated by the fuel cell 4 is supplied to the load device 99 via the output current path 92.

The amount of fuel gas 4a supplied to the fuel cell 4 is
The supply amount of the raw fuel 61a is determined by adjusting the valve opening degree of the flow rate adjusting valve 61 according to a control signal 6A issued from a central control device (not shown) or the like that is higher than the fuel cell power generator 9. ing. Also, the oxidant gas 5a
The amount supplied to the fuel cell 4 is determined by adjusting the amount supplied by the oxidant gas supply device 5 in accordance with a control signal 5A issued from the central control device (not shown). The control device 91 responds to the signal 62a output from the flow meter 62, the temperature of the reforming pipe 411 output from the temperature detector 413, or the temperature of the reforming catalyst housed in the reforming pipe 411. The signal 413a is input, and the combustion air 8a is output from these signals 62a and 413a.
Of the required supply amount of the control signal 9
1a is output to the air supply device 8.

In the fuel cell power generator 9 having the above-mentioned structure, the supply amount of the fuel gas 4a and the oxidant gas 5a in accordance with the control signals 6A and 5A issued from the central control unit (not shown) or the like which is in the higher order. Are supplied to the fuel cell 4, and the output current 9A having a value corresponding to these supply amounts is supplied to the load device 99 via the output current path 92. At that time, in order to reform the raw fuel 61a under a desired temperature condition, the reforming pipe 411 is heated by a heat medium which is a combustion gas of the fuel exhaust gas 7a and the combustion air 8a supplied from the heating device 412. Has been done.

By the way, when the current value required by the load device 99 changes, the control signals 5A and 6A are changed. For example, when the control signal 6A is a signal for increasing the supply amount of the raw fuel 61a, the valve opening degree of the flow rate adjusting valve 61 is widened in response to the control signal 6A, and the supply amount of the raw fuel 61a is increased. The dose will be increased immediately. However,
The supply amount of the fuel gas 4a is not immediately increased due to the fluid resistance in the fuel gas supply device 4B, the delay time due to the volume of the fluid passage, and the like. Therefore, control signal 5
Even if A and 6A are changed in the increasing direction, the load device 9
The output current 9A supplied to 9 is not increased immediately, but the output current value is generally controlled by a load control device (not shown) such as a converter so as to increase after a certain time.

By performing such control, the output current 9 is increased immediately after the amount of the raw fuel 61a is increased.
Until the A value is increased, the fuel component amount, which is the ratio of the fuel component contained in the fuel exhaust gas 7a, gradually increases. The combustion air 8a needs to be increased in amount in order to completely burn the fuel component in the fuel exhaust gas 7a in accordance with the increased fuel component amount. Furthermore, since the reforming pipe 411 may be overheated by increasing the amount of heating by the fuel exhaust gas 7a and the combustion air 8a, in order to keep the temperature of the reforming pipe 411 at a desired value, It is necessary to increase the amount of air 8a to lower the temperature of the combustion gas. The control device 91 controls this control. The control device 91 receives the signal 62a.
Detects the degree of change of the supply amount of the raw fuel 61a, detects the actual value of the temperature of the reforming pipe 411 and the like by the signal 413a, and determines the supply amount of the combustion air 8a required corresponding to these. The calculation is performed and the control signal 91a according to the calculation result is output.

[0011]

In the fuel cell power generator 9 according to the above-mentioned prior art, when the power value consumed by the load device 99 is in accordance with the operating condition from the central control unit or the like, the output of the predetermined value is output. The current 9A is supplied to the load device 99, and the operation state of the fuel gas supply device 4B is also performed under desired conditions. However, if the load device 99 does not comply with the operating conditions from the central control device or the like, and consumes less than the output current 9A corresponding to the operating conditions of the fuel cell power generator 9 from the central control device or the like, for example, When an abnormal operating state occurs, the following problems occur. That is, in such a case, the amount of fuel component in the fuel gas 4a consumed is reduced in proportion to the value of the output current 9A, so that the amount of fuel component in the fuel exhaust gas 7a increases. It will be. Therefore, in this case, the control device 9
The temperature of the reforming pipe 411 included in the fuel gas supply device 4B or the temperature of the reforming catalyst housed in the reforming pipe 411 is lower than the desired temperature because the precondition for the calculation of 1 is broken. It will rise excessively.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to keep the reforming catalyst portion provided in the fuel gas supply device at a desired temperature even if a load change occurs. It is to provide a fuel cell power generation device capable of doing the above.

[0013]

SUMMARY OF THE INVENTION In the present invention, the above-mentioned objects are as follows: 1) A fuel cell device for receiving a supply of a fuel gas and an oxidant gas to generate direct current electricity, and reforming a raw fuel with a reforming catalyst. And a fuel gas supply device having a heating device for heating the reforming catalyst,
An oxidant gas supply device that supplies an oxidant gas to the fuel cell device, a fuel exhaust gas supply means that supplies the exhaust gas of the fuel gas discharged from the fuel cell device to the heating device, and a combustion air to the heating device. To detect the amount of raw fuel supplied to the fuel gas supply device and the air supply device that supplies
In a fuel cell power generator equipped with a raw fuel supply amount detection device that outputs a signal corresponding to this raw fuel supply amount, the value of the output current output by the fuel cell device is detected, and the output current value is detected. An output current detection device that outputs a signal,
A controller for calculating the required amount of air in the heating device based on the signal output by the output current detection device and the signal output by the raw fuel supply amount detection device, and outputting a signal corresponding to this required air amount. The air supply device controls the amount of air supplied by the air supply device based on a signal output by the control device, or 2) In the means described in the above item 1, the control device detects the raw fuel supply amount. A fuel component generation amount calculation unit that calculates the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output by the device, and outputs a signal corresponding to this fuel component generation amount, and output current detection A fuel component consumption amount calculation unit that calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output by the device and outputs a signal corresponding to this fuel component consumption amount, and a fuel component generation amount The calculation section is output Based on the applied signal and the signal output by the fuel component consumption amount calculation unit, the difference between the fuel component generation amount and the fuel component consumption amount is calculated, and the signal corresponding to the difference is the fuel component amount in the fuel exhaust gas. Calculating the required amount of combustion air in the heating device based on the signals output from the exhaust gas fuel component amount calculation unit and the exhaust gas fuel component amount calculation unit, and corresponding to the required combustion air amount A reforming catalyst unit included in a fuel gas supply device based on a combustion air amount calculation unit that outputs a signal, a signal output by an exhaust gas fuel component amount calculation unit, and a signal output by a raw fuel supply amount detection device. And a reforming catalyst section cooling air amount calculating section for calculating a cooling air amount necessary for maintaining the temperature of the catalyst at a desired temperature and outputting a signal corresponding to the cooling air amount. The signal output by and the combustion The sum of the required reforming catalyst cooling air amount and the required combustion air amount is calculated based on the signal output from the air amount calculation unit, and the sum of the sum is the required air amount to be supplied by the air supply device. A configuration including a required air amount calculation unit that outputs a signal corresponding to the signal as a signal of the control device,
Or 3) in the means described in the above item 2, the reforming catalyst section cooling air amount calculating section provided in the control device is based on a signal output from the exhaust gas fuel component amount calculating section, and the fuel component in the fuel exhaust gas is Calculating a heat quantity that can be generated by the quantity and outputting a signal corresponding to this heat quantity;
Based on at least the signal output from the exhaust gas fuel component amount calculation unit and the signal output from the raw fuel supply amount detection device, it is necessary to maintain the reforming catalyst unit of the fuel gas supply device at a desired temperature. Of the fuel in the exhaust gas on the basis of the signal output from the reforming catalyst heating amount calculation unit that calculates the heating amount An excess heating amount calculation unit that calculates an excess heating amount that is the difference between the amount of heat generated by the component amount and the required heating amount for maintaining the reforming catalyst unit at a desired temperature, and outputs a signal corresponding to this excess heating amount. Based on the signal output from the excess heat amount calculation unit, the amount of cooling air required to maintain the fuel gas supply device at a desired temperature is calculated, and the signal corresponding to this cooling air amount is changed to this modified value. Quality of the cooling air amount calculator Or a fuel cell device that generates direct current electricity by receiving supply of fuel gas and oxidant gas, and reforms raw fuel with a reforming catalyst. And a fuel gas supply device having a heating device for heating the reforming catalyst,
An oxidant gas supply device that supplies an oxidant gas to the fuel cell device, a fuel exhaust gas supply means that supplies the exhaust gas of the fuel gas discharged from the fuel cell device to the heating device, and a combustion air to the heating device. To detect the amount of raw fuel supplied to the fuel gas supply device and the air supply device that supplies
In a fuel cell power generator equipped with a raw fuel supply amount detection device that outputs a signal corresponding to this raw fuel supply amount, the value of the output current output by the fuel cell device is detected, and the output current value is detected. An output current detection device that outputs a signal,
A flow rate adjusting device installed in a flow path of the fuel exhaust gas supply means through which the fuel exhaust gas flows, and adjusting the supply amount of the fuel exhaust gas supplied to the heating device, a signal output by the output current detection device, and a raw fuel supply amount And a controller for calculating the required amount of fuel exhaust gas in the heating device based on the signal output by the detection device and outputting a signal corresponding to this required fuel exhaust gas amount, based on the signal output by the controller. The flow rate adjusting device is adjusted to control the supply amount of the fuel exhaust gas supplied to the heating device, or 5) In the means described in the above item 4, the control device is a raw fuel supply amount detecting device. A fuel component generation amount calculation unit that calculates the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output by the fuel gas supply device and outputs a signal corresponding to this fuel component generation amount; A fuel component consumption amount calculation unit that calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output by the device and outputs a signal corresponding to this fuel component consumption amount, and a fuel component generation amount The difference between the fuel component production amount and the fuel component consumption amount is calculated based on the signal output by the calculation unit and the signal output by the fuel component consumption amount, and the difference is calculated as the fuel component amount in the fuel exhaust gas. Based on the signals output from the exhaust gas fuel component amount calculation unit that outputs the corresponding signal and the exhaust gas fuel component amount calculation unit, the heat amount that can be generated by the fuel component amount in this fuel exhaust gas is calculated, and this heat amount is calculated. Based on the signal output from the fuel exhaust gas heat generation amount calculation unit that outputs a signal corresponding to the above, the signal output from the exhaust gas fuel component amount calculation unit, and the signal output from the raw fuel supply amount detection device. Quality catalyst Is output to the reforming catalyst unit heating amount calculation unit that calculates the required heating amount required to maintain the desired temperature and outputs a signal corresponding to this heating amount. Based on the signal output from the above-mentioned signal and the signal output from the fuel exhaust gas heat generation amount calculation unit, the excess heating amount, which is the difference between the heat generation amount due to the fuel component amount in the fuel exhaust gas and the required heating amount of the reforming catalyst unit, is calculated, Based on the signal output from the excess heating amount calculation unit that outputs a signal corresponding to this excess heating amount, and the signal output from the fuel exhaust gas heat generation amount calculation unit, the fuel exhaust gas to the fuel gas supply device that makes the excess heating amount zero Or a required fuel exhaust gas supply amount calculation unit for calculating an adjustment amount of the flow rate adjusting device corresponding to the supply amount and outputting a signal corresponding to the required fuel exhaust gas supply amount as a signal of the control device, or 6) With fuel gas A fuel cell device that receives a supply of an agent gas to generate direct current electricity and a device that generates a fuel gas by reforming a raw fuel with a reforming catalyst, and a heating device that heats the reforming catalyst. A fuel gas supply device having
An oxidant gas supply device that supplies an oxidant gas to the fuel cell device, a fuel exhaust gas supply means that supplies the exhaust gas of the fuel gas discharged from the fuel cell device to the heating device, and a combustion air to the heating device. To detect the amount of raw fuel supplied to the fuel gas supply device and the air supply device that supplies
In a fuel cell power generator equipped with a raw fuel supply amount detection device that outputs a signal corresponding to this raw fuel supply amount, the value of the output current output by the fuel cell device is detected, and the output current value is detected. An output current detection device that outputs a signal,
A device for supplying auxiliary fuel to a heating device, the auxiliary fuel supply means having a flow rate adjusting device for adjusting the supply amount of the auxiliary fuel, a signal output by the output current detection device and a raw fuel supply amount detection device output A controller for calculating a required amount of auxiliary fuel in the heating device based on the signal, and outputting a signal corresponding to the required auxiliary fuel supply amount,
The flow rate adjusting device is adjusted based on the signal output by the control device to control the supply amount of the auxiliary fuel supplied to the heating device, or 7) in the means described in 6 above, The control device calculates the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output by the raw fuel supply amount detection device, and outputs a signal corresponding to this fuel component generation amount. Fuel component consumption that calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output from the production amount calculation unit and the output current detection device and outputs a signal corresponding to this fuel component consumption amount The difference between the fuel component generation amount and the fuel component consumption amount is calculated based on the amount calculation unit, the signal output by the fuel component generation amount calculation unit, and the signal output by the fuel component consumption amount calculation unit. In a certain fuel exhaust gas The amount of heat that can be generated by the fuel component amount in the fuel exhaust gas is calculated based on the signal output from the exhaust gas fuel component amount calculation unit that outputs a signal corresponding to the fuel component amount and the exhaust gas fuel component amount calculation unit Then, the fuel gas supply device based on the fuel exhaust gas generation heat amount calculation unit that outputs a signal corresponding to this heat amount, and the signal output by the exhaust gas fuel component amount calculation unit and the signal output by the raw fuel supply amount detection device. Calculates the required amount of heating required to keep the reforming catalyst part of the
Based on the signals output by the reforming catalyst heating amount calculation unit that outputs a signal corresponding to this heating amount, the reforming catalyst heating amount calculation unit, and the signals output by the fuel exhaust gas heat generation amount calculation unit described above, Calculate the underheating amount, which is the difference between the amount of heat generated by the amount of fuel components in the exhaust gas and the required amount of heating for the reforming catalyst,
Based on the insufficient heating amount calculation unit that outputs a signal corresponding to this insufficient heating amount and the signal output by this insufficient heat amount calculation unit,
A required auxiliary fuel supply amount calculation unit that calculates the amount of auxiliary fuel supplied to the fuel gas supply device that makes the underheating amount zero and outputs a signal corresponding to this required auxiliary fuel supply amount. Achieved by

[0014]

According to the present invention, in the fuel cell power generator, (1) the value of the output current output by the fuel cell device is detected,
Calculate the required amount of air in the heating device based on the output current detection device that outputs a signal corresponding to this output current value, and the signal output by the output current detection device and the signal output by the raw fuel supply amount detection device And a control device that outputs a signal corresponding to the required air amount.
For example, the fuel component generation amount that calculates the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output by the raw fuel supply amount detection device and outputs a signal corresponding to this fuel component generation amount. A fuel component consumption amount calculation that calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output from the calculation unit and the output current detection device and outputs a signal corresponding to this fuel component consumption amount And a signal output by the fuel component generation amount calculation unit and a signal output by the fuel component consumption amount calculation unit, a difference between the fuel component generation amount and the fuel component consumption amount is calculated, and the difference between the fuel component generation amount and the fuel component consumption amount is calculated. The required amount of combustion air in the heating device is calculated based on the signal output from the exhaust gas fuel component amount calculation unit that outputs a signal corresponding to the fuel component amount in the exhaust gas and the exhaust gas fuel component amount calculation unit. ， Required combustion air Based on the signal output from the combustion air amount calculation unit that outputs a signal corresponding to the amount, the signal output from the exhaust gas fuel component amount calculation unit, and the signal output by the raw fuel supply amount detection device. Reforming catalyst part cooling air amount calculating part for calculating the cooling air amount necessary for maintaining the quality catalyst part at a desired temperature and outputting a signal corresponding to this cooling air amount, and the reforming catalyst part cooling air The sum of the required reforming catalyst cooling air amount and the required combustion air amount is calculated based on the signal output by the amount calculation unit and the signal output by the combustion air amount calculation unit, and this sum is calculated. And a required air amount calculation unit that outputs a signal corresponding to the required air amount to be supplied by the air supply device as a signal of this control device, where the reforming catalyst unit cooling air amount calculation unit is , For example, the output of the fuel component amount calculation unit in the exhaust gas Based on the signal, the amount of heat that can be generated by the amount of fuel component in the fuel exhaust gas is calculated, and the fuel exhaust gas generated heat amount calculation unit that outputs a signal corresponding to this amount of heat and at least the exhaust gas fuel component amount calculation unit outputs Reforming catalyst unit that calculates the amount of heating required to maintain the reforming catalyst unit of the fuel gas supply device at a desired temperature based on the signal output from the raw fuel supply amount detection device and the signal output from the raw fuel supply amount detection device. Based on the heating amount calculation unit, the signal output by the fuel exhaust gas heat generation amount calculation unit, and the signal output by the reforming catalyst unit heating amount calculation unit, the amount of heat generated by the fuel component amount in the fuel exhaust gas and the reforming catalyst unit Calculate the excess heating amount, which is the difference from the required heating amount to maintain the desired temperature
On the basis of the signal output from this excess heat amount calculation unit that outputs a signal corresponding to this excess heat amount, the cooling air required to keep the fuel gas supply device at the desired temperature And a cooling air amount calculation unit for calculating the amount and outputting a signal corresponding to this cooling air amount as a signal of the reforming catalyst unit cooling air amount calculation unit. Since the configuration is such that the amount of air supplied by the air supply device is controlled based on this, the fluctuation in the output current value is always detected by the output current detection device. Based on the output current value detected by the output current detection device and the raw fuel supply amount detected by the raw fuel supply amount detection device, in the control device, the fuel component amount in the fuel gas is From the former, the amount of fuel component consumed in the fuel electrode of the fuel cell device is calculated by each calculation unit according to the well-known Faraday's law. The difference between the fuel component amount in the fuel gas and the fuel component amount consumed in the fuel electrode is the fuel component amount in the fuel exhaust gas without correction, and it is well known if this fuel component amount is known. Based on the knowledge of the existing chemical reaction and the like, the required amount of combustion air required for burning this fuel exhaust gas is calculated by the corresponding calculation unit.

Further, based on the signal output from the raw fuel supply amount detecting device, the amount of fuel component in the fuel exhaust gas, etc., the following arithmetic operation is executed in the corresponding arithmetic unit in the control device. That is, from the former, the required heating amount required to heat this raw fuel to a temperature equivalent to that of the reforming catalyst, and the endothermic amount when steam reforming this raw fuel (using the reforming catalyst) As is well known, steam reforming of a hydrocarbon-based raw fuel is an endothermic reaction.) Is calculated based on the physical properties of the raw fuel and the like. From the latter, first, the amount of heat generated that can be generated from the fuel exhaust gas is calculated based on the knowledge regarding the chemical reaction and the like. From the latter, the amount of heat taken away from the fuel gas supply device by the combustion gas generated from the combustion air and the fuel exhaust gas required for burning the fuel exhaust gas is the exhaust gas temperature / physical property value of the combustion gas. It is calculated based on etc. Furthermore, independently of the signal output from the raw fuel supply amount detection device and the amount of fuel component in the fuel exhaust gas, in maintaining the reforming catalyst at a desired temperature,
The amount of heat radiated from the fuel gas supply device to the atmosphere or the like is calculated based on the heat dissipation coefficient in consideration of the heat insulating structure of the fuel gas supply device.

Furthermore, the sum of the amount of heat generated from the above-mentioned fuel exhaust gas, the amount of heat of the raw fuel, the amount of heat absorbed during steam reforming, the amount of heat taken away by the combustion gas, the amount of heat dissipated from the fuel gas supply device, etc. The excess heating amount is calculated from the difference from the required heating amount. Based on this excess heating amount, the required amount of cooling air required to keep the reforming catalyst part of the fuel gas supply device at a desired temperature is based on the physical properties of the cooling air, etc. The required amount of cooling air is calculated and calculated.

The required total air amount of the fuel cell power generator can be obtained by calculating the sum in the corresponding calculation unit based on the required cooling air amount and the required combustion air amount. A signal corresponding to the calculation result regarding the required total air amount is always output from the control device.
In the present invention, based on this signal output from the control device, the air amount supplied from the air supply device is constantly controlled so as to match the required total air amount, so that the central control device, etc. To maintain the temperature of the reforming catalyst part of the fuel gas supply device at a desired temperature even when an abnormal operating state different from the output current corresponding to the operating condition of the fuel cell power generator occurs in the load device. Is possible. Also, (2) detecting the value of the output current output by the fuel cell device,
An output current detection device that outputs a signal corresponding to this output current value, and a flow rate that is installed in the flow path of the fuel exhaust gas supply means through which the fuel exhaust gas flows and that adjusts the supply amount of the fuel exhaust gas supplied to the heating device. The required amount of fuel exhaust gas in the heating device is calculated based on the signal output from the adjustment device, the output current detection device, and the signal output from the raw fuel supply amount detection device, and a signal corresponding to this required fuel exhaust gas amount is calculated. And a control device that outputs the fuel component. The control device, for example, calculates the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output by the raw fuel supply amount detection device. The fuel component generation amount calculation unit that outputs a signal corresponding to the generation amount, and the fuel component amount in the fuel gas consumed in the fuel cell device is calculated based on the signal output by the output current detection device. Based on the fuel component consumption calculation unit that outputs a signal corresponding to the cost amount, the signal output by the fuel component generation amount calculation unit, and the signal output by the fuel component consumption amount calculation unit, the fuel component generation amount and the fuel Based on the signal output from the exhaust gas fuel component amount calculation unit that calculates the difference in component consumption amount and outputs a signal corresponding to the fuel component amount in the fuel exhaust gas, which is the difference, and the signal output from the exhaust gas fuel component amount calculation unit. Then, the calorific value that can be generated by the fuel component amount in the fuel exhaust gas is calculated and a signal corresponding to this calorific value is output, and the signal output from the exhaust gas fuel component amount calculation part and the raw fuel are output. Based on the signal output from the supply amount detection device, the required heating amount required to maintain the reforming catalyst portion of the fuel gas supply device at a desired temperature is calculated, and this heating amount is handled. Output signal Based on the signal output by the reforming catalyst heating amount calculation unit, the signal output by the reforming catalyst heating amount calculation unit and the signal output by the fuel exhaust gas heat generation amount calculation unit, the heat generation amount by the fuel component amount in the fuel exhaust gas An excess heating amount calculation unit that calculates an excess heating amount that is a difference from the required heating amount of the reforming catalyst unit and outputs a signal corresponding to this excess heating amount, and a signal output by the excess heating amount calculation unit and the fuel exhaust gas. Based on the signal output from the calorific value calculator,
It is necessary to calculate the adjustment amount of the flow rate adjustment device that corresponds to the fuel exhaust gas supply amount to the fuel gas supply device that makes the excess heating amount zero, and to output the signal corresponding to this required fuel exhaust gas supply amount as the signal of this control device. A fuel exhaust gas supply amount calculation unit is provided, and the flow control device is adjusted based on the signal output from this control device to control the supply amount of the fuel exhaust gas supplied to the heating device. Therefore, the fluctuation of the output current value is always detected by the output current detection device, and based on the output current value detected by the output current detection device and the raw fuel supply amount detected by the raw fuel supply amount detection device. The calculation of the fuel component amount in the fuel exhaust gas is exactly the same as in the case of the above item (1).
Further, the excessive heating amount is calculated based on the amount of the fuel component in the fuel exhaust gas and the signal output from the raw fuel supply amount detecting device, which is exactly the same as the case of the above item (1). . In the case of the item (2), the excessive heating amount obtained by the corresponding calculation unit and the fuel exhaust gas generation heat amount based on the signal output from the fuel exhaust gas generation heat amount calculation unit (the heat amount that can be generated by the total amount of the fuel exhaust gas The ratio of the fuel exhaust gas supplied to the fuel gas supply device is calculated first. Based on this result, the adjustment amount of the flow rate control device is calculated in consideration of the adjustment characteristics and the like of the flow rate control device. A signal corresponding to the required fuel exhaust gas amount, which is the adjustment amount of the flow rate control device, is always output from the control device.

In the present invention, the flow rate adjusting device is adjusted based on this signal output from the control device, and the supply amount of the fuel exhaust gas supplied to the heating device is controlled by the reforming catalyst section of the fuel gas supply device. By constantly controlling so that the amount is appropriate to maintain the desired temperature, an abnormal operating state different from the output current corresponding to the operating condition of the fuel cell power generator from the central control unit, etc. Even if it occurs, it is possible to maintain the temperature of the reforming catalyst part of the fuel gas supply device at a desired temperature. Furthermore, (3) detecting the value of the output current output by the fuel cell device,
An output current detection device that outputs a signal corresponding to this output current value, and a device that supplies auxiliary fuel to the heating device,
Based on the signal output from the output current detecting device and the signal output from the raw fuel supply amount detecting device, the auxiliary fuel supplying means having a flow rate adjusting device for adjusting the supply amount of the auxiliary fuel, And a control device for calculating a required amount and outputting a signal corresponding to the required auxiliary fuel supply amount. This control device is, for example, a fuel gas supply device based on a signal output by the raw fuel supply amount detection device. A fuel component generation amount calculation unit that calculates a fuel component amount in the generated fuel gas and outputs a signal corresponding to the fuel component generation amount;
A fuel component consumption amount calculation unit that calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output by the output current detection device and outputs a signal corresponding to this fuel component consumption amount; The difference between the fuel component generation amount and the fuel component consumption amount is calculated based on the signal output by the component generation amount calculation unit and the signal output by the fuel component consumption amount calculation unit. The amount of heat that can be generated by the fuel component amount in the fuel exhaust gas is calculated based on the signal output from the exhaust gas fuel component amount calculation unit that outputs a signal corresponding to the component amount and the exhaust gas fuel component amount calculation unit. A fuel gas supply device based on a signal output from the fuel exhaust gas generation heat amount calculation unit that outputs a signal corresponding to this heat amount, a signal output from the exhaust gas fuel component amount calculation unit, and a signal output from the raw fuel supply amount detection device. Have A heating amount calculation unit for the reforming catalyst unit that calculates the required heating amount required to maintain the reforming catalyst unit at a desired temperature and outputs a signal corresponding to this heating amount. Based on the signal output by the calculation unit and the signal output by the fuel exhaust gas generated heat amount calculation unit, the insufficient heating amount that is the difference between the generated heat amount due to the fuel component amount in the fuel exhaust gas and the required heating amount of the reforming catalyst unit. Is calculated and outputs a signal corresponding to the insufficient heating amount, and an auxiliary fuel to the fuel gas supply device that makes the insufficient heating amount zero based on the signal output by the insufficient heating amount calculation unit. And a required auxiliary fuel supply amount calculation unit that outputs a signal corresponding to this required auxiliary fuel supply amount, and adjusts the flow rate adjusting device based on the signal output by this control device. , Of the auxiliary fuel supplied to the heating device Due to the configuration in which the supply amount is controlled, the fluctuation of the output current value is always detected by the output current detection device, the output current value detected by the output current detection device, and the raw fuel supply amount detection device. The fuel component amount in the fuel exhaust gas is calculated based on the raw fuel supply amount detected by the same as in the case of the above item (1). Further, in the corresponding calculation unit, the amount of heat generated that can be generated from the fuel exhaust gas is calculated based on the amount of the fuel component in the fuel exhaust gas,
Also, based on the amount of the fuel component in the fuel exhaust gas and the signal output from the raw fuel supply amount detection device, the amount of heating of the raw fuel, the amount of heat absorbed during steam reforming, the amount of heat taken away by the combustion gas, the fuel gas supply The calculation of the required amount of heat, which is the sum of the amount of heat dissipated from the device, is exactly the same as in the case of the above item (1).

In the case of the item (3), the ratio of the insufficient heating amount obtained by the corresponding calculation unit to the fuel exhaust gas generation heat amount based on the signal output from the fuel exhaust gas generation heat amount calculation unit is calculated by the corresponding calculation unit. First, it is calculated, and from this, the required auxiliary fuel supply amount for which the underheating amount should be zero is calculated. Based on this result, the adjustment amount of the flow rate control device is calculated in consideration of the adjustment characteristics and the like of the flow rate control device. A signal corresponding to the required auxiliary fuel supply amount, which is the adjustment amount of the flow rate control device, is always output from the control device.

In the present invention, the flow rate adjusting device is adjusted based on this signal output from the control device, and the amount of auxiliary fuel supplied to the heating device is adjusted by the reforming catalyst portion of the fuel gas supply device. By constantly controlling so that the amount is appropriate to maintain the desired temperature, an abnormal operating state different from the output current corresponding to the operating condition of the fuel cell power generator from the central control unit, etc. Even if it occurs, it is possible to maintain the temperature of the reforming catalyst part of the fuel gas supply device at a desired temperature.

[0021]

Embodiments of the present invention will be described in detail below with reference to the drawings. Embodiment 1; FIG. 1 is a block diagram showing a configuration of a main part of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 1 to 3 together with its load device.
FIG. 2 is a block circuit diagram of the control device shown in FIG. 1.
In FIG. 1, the same parts as those of the conventional fuel cell power generator shown in FIG. 9 are designated by the same reference numerals, and the description thereof will be omitted. In addition, in FIG. 1, only the representative reference numerals are shown for the reference numerals given in FIG. 9.

In FIG. 1, reference numeral 1 denotes a fuel gas generator 4A, a fuel gas generator 4A, a control unit 91 in place of the fuel cell power generator 9 according to the conventional example shown in FIG.
This is a fuel cell power generation device that uses the control device 2 and includes an output current detection device 31. The fuel gas supply device 4A is provided with a fuel reformer 41A instead of the fuel reformer 41B as compared with the conventional fuel gas supply device 4B. The fuel reformer 41A is different from the conventional fuel reformer 41B in that it has a temperature detector for detecting the temperature of the reforming pipe 411 and the like used for calculating the required supply amount of the combustion air 8a. , The only difference is that it is not installed. The output current detection device 31 is, for example, a hall DCC.
T, a shunt, etc., installed in the output current path 92,
The signal 31a corresponding to the value of the output current 9A is output.

As shown in FIG. 2, the control device 2 includes a fuel component production amount calculation unit 21 and a fuel component consumption amount calculation unit 22.
An exhaust gas fuel component amount calculation unit 23, a combustion air amount calculation unit 24, a reforming catalyst unit cooling air amount calculation unit 25, and a required air amount calculation unit 26. Further, the reforming catalyst part cooling air amount calculation part 25 includes a fuel exhaust gas generation heat amount calculation part 25.
1, a reforming catalyst unit heating amount calculation unit 252, an excessive heating amount calculation unit 253, and a cooling air amount calculation unit 254.

The fuel component production amount calculation unit 21 includes a flow meter 62.
The signal 62a output by the above is input, the fuel component amount in the fuel gas 4a generated in the fuel gas supply device 2 is calculated based on the signal 62a, and the signal 21a corresponding to this fuel component generation amount is output. To do. In the fuel component consumption amount calculation unit 22, the signal 31a output from the output current detection device 31 is input and the fuel component amount in the fuel gas 4a consumed by the fuel cell device 4 is calculated. According to Faraday's law, the value of the output current 9A and the amount of fuel component consumed in the fuel electrode of the fuel cell device are in proportion to each other. It is possible to calculate the amount of the fuel component inside. A signal corresponding to the fuel component consumption amount is output from the fuel component consumption amount calculation unit 22 as a signal 22a. The exhaust gas fuel component amount calculation unit 23 inputs the signal 21a and the signal 22a,
Based on these signals, the difference between the fuel component production amount and the fuel component consumption amount is calculated. The fuel component that is this difference is the fuel component that should be contained in the fuel exhaust gas 7a. A signal corresponding to the fuel component amount of the fuel exhaust gas 7a is output from the exhaust gas fuel component amount calculation unit 23 as a signal 23a. The signal 23a is input to the combustion air amount calculation unit 24, and a required combustion air amount required to burn the fuel component in the fuel exhaust gas 7a according to the signal 23a is calculated. This operation is
In addition to the theoretical air amount corresponding to the fuel component amount of the fuel exhaust gas 7a, the excess air amount necessary for completely burning the fuel exhaust gas 7a determined by the structure of the heating device 412 and the like is included in the calculation. A signal corresponding to this required combustion air amount is output from the combustion air amount calculation unit 24 as a signal 24a.

In the reforming catalyst section cooling air amount calculation unit 25, first, the fuel exhaust gas generation heat amount calculation unit 251 outputs the signal 2
3a is input and the amount of heat that can be generated from the fuel exhaust gas 7a by burning the fuel exhaust gas 7a according to the signal 23a is calculated based on the well-known knowledge about chemical reactions and the like. The signal corresponding to this amount of heat generated is signal 25.
It is output from the fuel exhaust gas heat generation amount calculation unit 251 as 1a. Further, the reforming catalyst unit heating amount calculation unit 252 outputs the signal 6
2a, signal 23a, and cooling air amount calculation unit 25 described later.
4 receives the signals 254a output from the No. 4 and follows the signals 254a required to keep the reforming pipe 411 or the reforming catalyst housed in the reforming pipe 411 at a desired temperature. Calculate the heating amount. Regarding the signal 62a, this calculation content is the required heating amount required to heat the raw fuel 61a to a temperature equivalent to that of the reforming catalyst in the reforming pipe 411,
A well-known heat absorption amount generated when the raw fuel 61a is steam-reformed by the reforming catalyst is calculated based on the physical property value of the raw fuel and the like.

The combustion air 8a required for burning the fuel exhaust gas 7a and the combustion gas generated from the fuel exhaust gas 7a remain at a considerably high temperature and the fuel gas supply device 4A
Is emitted from. The amount of heat that this high-temperature combustion gas still retains at the time of discharge is the fuel gas supply device 4
This is one of the amounts of heat taken away from A. The amount of heat taken away by the combustion gas is calculated based on the signal 23a in the reforming catalyst heating amount calculation unit 252 based on the exhaust gas temperature and the physical property value of the combustion gas. In addition, the cooling air amount calculation unit 2
Since the cooling air whose supply amount is calculated in 54 is included in the combustion air 8a supplied from the air supply device 8 and supplied, the fuel gas is supplied at the same high temperature as the combustion gas. It is discharged from the device 4A. Therefore, the amount of heat taken away by the cooling air also needs to be calculated as one of the amounts of heat taken away from the fuel gas supply device 4A. The amount of heat taken away by this cooling air is the signal 254a.
Based on the above, in the reforming catalyst unit heating amount calculation unit 252,
It is calculated based on the exhaust temperature of the cooling air and the physical property values.

Further, independently of the values of the signals 62a, 23a, etc., in maintaining the reforming catalyst at a desired temperature, the amount of heat radiated from the fuel gas supply device 4A to the atmosphere etc. It exists as one of the amounts of heat taken away from the device 4A. This heat radiation amount is the fuel gas supply device 4
It is calculated based on the heat dissipation coefficient, the temperature of the reforming pipe 411, etc. in consideration of the heat insulating structure of A and the like. Reforming catalyst unit heating amount calculation unit 2
The sum of the above-mentioned various heat amounts obtained in 52 is calculated as the required heating amount required to maintain the reforming pipe 411 or the reforming catalyst housed in the reforming pipe 411 at a desired temperature. A signal corresponding to the required heating amount is output from the reforming catalyst unit heating amount calculation unit 252 as a signal 252a.

Next, the excess heating amount calculation unit 253 outputs the signal 2
51a and 252a are input, and the difference between the heat generation amount of the fuel exhaust gas 7a according to the signal 251a and the required heating amount according to the signal 252a is calculated. This difference is the heating amount at which the heat generation amount of the fuel exhaust gas 7a is excessive with respect to the required heating amount. A signal corresponding to this excess heating amount is output from the excess heating amount calculation unit 253 as a signal 253a. Further, the cooling air amount calculation unit 254 inputs the signal 253a and uses the excess heating amount according to the signal 253a to determine the amount of cooling air required to keep the fuel gas supply device 4A at a desired temperature. However, it is calculated based on the physical properties of the combustion air 8a. Note that this calculation is based on the combustion air 8a.
However, when the reforming pipe 411 or the reforming catalyst housed in the reforming pipe 411 is cooled, it is performed under the conditions that take into consideration the cooling coefficient and the like. The signal corresponding to this cooling air amount is signal 2
54a is output from the cooling air amount calculation unit 254. This signal 254a is also a signal output by the reforming catalyst part cooling air amount calculation part 25.

The required air amount calculation unit 26 uses the signals 24a, 2
54a is input and the sum of the required combustion air amount for burning the fuel exhaust gas 7a based on the signal 24a and the required cooling air amount for maintaining the fuel gas supply device 4A at the desired temperature based on the signal 254a. Is calculated. This sum should be the required supply amount (required air amount) of the air that is the combustion air 8a to be supplied by the air supply device 8. The signal corresponding to this required air amount is the signal 2 output by the control device 2.
It is output from the required air amount calculation unit 26 as a.

In the fuel cell power generator 1, the air supply device 8 inputs the signal 2a output from the control device 2,
The amount of combustion air 8a according to the signal 2a is supplied to the fuel reformer 41.
A is supplied to the heating device 412. The embodiment shown in FIGS. 1 and 2 has the above-described configuration, so that the fuel cell 4 supplies the combustion air 8a supplied from the air supply device 8 based on the signal 2a output from the control device 2. It is based on the value of the output current 9A, and is constantly controlled so as to match the required air amount corresponding to this output current 9A value. As a result, the reforming catalyst included in the fuel gas supply device 4A is generated even when the load device 99 has an abnormal operating state different from the output current corresponding to the operating condition of the fuel cell power generator from the central control device or the like. It is possible to maintain the temperature of the section at a desired temperature.

Embodiment 2; FIG. 3 is a block diagram showing the construction of the main part of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 4 and 5, together with its load device.
FIG. 4 is a block circuit diagram of the control device shown in FIG. 3.
In FIGS. 3 and 4, claims 1 to 3 shown in FIGS.
The same parts as those of the fuel cell power generator according to the embodiment of the present invention and parts corresponding to those of the fuel cell power generator according to the conventional example shown in FIG. 9 are designated by the same reference numerals, and the description thereof will be omitted. In addition, in FIG. 3, only the typical reference numerals are shown for the reference numerals given in FIGS. 1 and 9.

In FIG. 3, 1A is a fuel cell power generator 1 according to the present invention corresponding to the first to third aspects shown in FIG.
On the other hand, it is a fuel cell power generation device in which the control device 2A is used instead of the control device 2 and the three-way regulating valve 71 as a flow rate control device is provided. Three-way regulating valve 71
Is installed in the fuel exhaust gas supply line 7, and is heated by the heating device 412.
The supply amount of the fuel exhaust gas 7a supplied to the control unit 2A is adjusted according to the signal output from the control device 2A.

The controller 2A, as shown in FIG.
For the control device 2, a required fuel exhaust gas supply amount calculation unit 27 is used instead of the cooling air amount calculation unit 254, and
The combustion air amount calculation unit 24 and the required air amount calculation unit 26 in the control device 2 are not used. The required fuel exhaust gas supply amount calculation unit 27 inputs the signals 251a and 253a, and outputs the signal 25 of the excessive heating amount based on the signal 253a.
The ratio to the heat generation amount of the fuel exhaust gas 7a based on 1a is calculated, and from this, the ideal supply amount of the fuel exhaust gas 7a to the fuel gas supply device 4A at which the excessive heating amount should be zero is calculated. Then, based on this desired supply amount of the fuel exhaust gas 7a, the adjustment amount to be adjusted by the three-way adjusting valve 71 is calculated in consideration of the flow rate adjusting characteristics of the three-way adjusting valve 71 and the like. The signal relating to the adjustment amount to be adjusted by the three-way adjusting valve 71 is a signal corresponding to the required air amount in the control device 2A, and the signal 2Aa output by the control device 2A.
Is output from the required fuel exhaust gas supply amount calculation unit 27.

In the fuel cell power generator 1A, the three-way regulating valve 71 receives the signal 2Aa output by the controller 2A and supplies the fuel exhaust gas 7a in an amount according to the signal 2Aa to the heating device 412 provided in the fuel reformer 41A. Supply to. Excess fuel exhaust gas 7b that is not supplied to the heating device 412 is discharged to the outside of the fuel cell power generation device 1A from the three-way regulating valve 71, directly or through some combustion device.

In the fuel cell power generator 1A,
The air supply device 8 operates according to the control signal 8A issued from the central control device or the like, and supplies the combustion air 8a in an amount according to the control signal 8A to the heating device 412 included in the fuel reformer 41A. Further, it is preferable that the supply amount of the raw fuel 61a supplied according to the control signal 6A is set to a sufficient amount capable of sufficiently responding to the sudden increase in the load device 99.

Since the embodiment shown in FIGS. 3 and 4 has the above-mentioned configuration, the supply amount of the fuel exhaust gas 7a supplied from the three-way regulating valve 71 to the heating device 412 based on the signal 2Aa output from the control device 2A. Is always controlled based on the value of the output current 9A output from the fuel cell 4 so as to match the required fuel exhaust gas supply amount corresponding to this output current 9A value. As a result, the reforming catalyst included in the fuel gas supply device 4A is generated even when the load device 99 has an abnormal operating state different from the output current corresponding to the operating condition of the fuel cell power generator from the central control device or the like. It is possible to maintain the temperature of the section at a desired temperature.

When the structure according to the second embodiment is adopted, in order to prevent the reforming catalyst temperature from rising excessively,
The supply amount of the fuel exhaust gas 7a supplied to the heating device 412 is directly reduced. By the way, in the case of the configuration according to the first embodiment, in order to prevent the reforming catalyst temperature from rising excessively, the supply of the combustion air 8a supplied by the air supply device 8 including the blower handling a large capacity is supplied. This is done by reducing the amount. Therefore, this Example 2
In the case of the configuration according to (1), the control operation can be relatively easily performed when the amount of heat supplied by the heating device 412 is reduced, as compared with the configuration according to the first embodiment. Is.

[Embodiment 3] FIG. 5 is a block diagram showing the construction of the essential parts of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 6 and 7 together with its load device.
FIG. 6 is a block circuit diagram of the control device shown in FIG. 5.
In FIGS. 5 and 6, claims 1 to 3 shown in FIGS.
Corresponding to the fuel cell power generator according to one embodiment of the present invention, the same portion as the fuel cell power generator according to one embodiment of the present invention corresponding to claims 4 and 5 shown in FIGS. 3 and 4, and The same parts as those of the conventional fuel cell power generator shown in FIG. 9 are designated by the same reference numerals, and the description thereof will be omitted. In addition, in FIG. 5, as for the reference numerals given in FIGS. 1 and 9, only representative reference numerals are shown.

In FIG. 5, 1B is a fuel cell power generator 1 according to the present invention corresponding to claims 4 and 5 shown in FIG.
For A, the control device 2B is used instead of the control device 2A, and the three-way regulating valve 71 to the fuel exhaust gas supply pipeline 7 is used.
Is installed and an auxiliary fuel supply pipe line 6B as an auxiliary fuel supply means is provided.
An adjusting valve 69 is installed in the auxiliary fuel supply line 6B, and the supply amount of the auxiliary fuel 6Ba supplied to the heating device 412 is adjusted according to the signal output from the control device 2B.

The controller 2B, as shown in FIG.
For the control device 2A, an excessive heating amount calculation unit 253 is used instead of the insufficient heating amount calculation unit 28, and a required fuel / fuel exhaust gas supply amount calculation unit 27 is used to use the required auxiliary fuel supply amount calculation unit 29. I am trying. Underheating amount calculation unit 2
8 receives the signals 251a and 252a, and the signal 251a
The difference between the heat generation amount of the fuel exhaust gas 7a according to the above and the required heating amount according to the signal 252a is calculated. This difference is the heating amount at which the heat generation amount of the fuel exhaust gas 7a is insufficient with respect to the required heating amount. The signal corresponding to this insufficient heating amount is signal 2
8a is output from the insufficient heating amount calculation unit 28. The required auxiliary fuel supply amount calculation unit 29 inputs the signals 251a and 28a, and outputs the signal 251 of the insufficient heating amount based on the signal 28a.
The ratio to the heat generation amount of the fuel exhaust gas 7a based on a is calculated, and from this, the ideal supply amount of the auxiliary fuel 6Ba to the fuel gas supply device 4A at which the insufficient heating amount should be zero is calculated. Subsequently, the adjustment amount to be adjusted by the adjustment valve 69 is calculated on the basis of the desired supply amount of the auxiliary fuel 6Ba, in consideration of the flow rate adjustment characteristics of the adjustment valve 69 and the like.
The signal related to the adjustment amount to be adjusted by the adjusting valve 69 is a signal corresponding to the required auxiliary fuel supply amount in the control device 2B, and is the required auxiliary fuel supply amount calculation unit 29 as the signal 2Ba output by the control device 2B. Is output from.

In the fuel cell power generator 1B, the regulating valve 69 inputs the signal 2Ba output by the controller 2B and supplies the auxiliary fuel 6Ba in an amount according to the signal 2Ba to the heating device 412 provided in the fuel reformer 41A. Supply. Therefore,
The heating device 412 includes the fuel exhaust gas 7a and the auxiliary fuel 6B.
a and are supplied as fuel for combustion gas.
In addition, in the fuel cell power generator 1B, the air supply device 8 uses the control signal 8 issued from the central control device or the like.
A heating device 412 provided in the fuel reformer 41A with the combustion air 8a in an amount according to the control signal 8A.
Supply to. Further, it is preferable that the supply amount of the raw fuel 61a supplied according to the control signal 6A is set to be slightly smaller than the amount that can cope with the sudden increase of the load device 99.

Since the embodiment shown in FIGS. 5 and 6 has the above-mentioned configuration, the supply amount of the auxiliary fuel 6Ba supplied from the adjusting valve 69 is based on the signal 2Ba output by the control device 2B. On the basis of the value of the output current 9A output by the engine, it is constantly controlled so as to match the required auxiliary fuel supply amount corresponding to this output current 9A value. As a result, the reforming catalyst included in the fuel gas supply device 4A is generated even when the load device 99 has an abnormal operating state different from the output current corresponding to the operating condition of the fuel cell power generator from the central control device or the like. It is possible to maintain the temperature of the section at a desired temperature.

In the case of the configuration according to the third embodiment, the auxiliary fuel 6Ba is directly supplied to the heating device 412 when the heating amount supplied by the heating device 412 is increased. By the way, in the case of the configuration according to the first embodiment, when the heating amount supplied by the heating device 412 is increased, the supply amount of the raw fuel 61a is first increased,
This is done by increasing the amount of the fuel component contained in the fuel exhaust gas 7a. Therefore, in the case of the configuration according to the third embodiment, when the heating amount supplied by the heating device 412 is increased, the response delay time of an extremely short time corresponds to the configuration according to the first embodiment. It becomes possible.

Embodiment 4; FIG. 7 is a block diagram showing the construction of the main part of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 4 to 7 together with its load device.
FIG. 8 is a block circuit diagram of the control device shown in FIG. 7.
In FIGS. 7 and 8, claims 1 to 3 shown in FIGS.
The same portion as the fuel cell power generator according to one embodiment of the present invention corresponding to the above, the same portion as the fuel cell power generator according to one embodiment of the present invention corresponding to claims 4 and 5 shown in FIGS. 5, the same parts as the fuel cell power generator according to one embodiment of the present invention corresponding to claims 6 and 7 shown in FIG. 6 and the same parts as the fuel cell power generator according to the conventional example shown in FIG. 9 are the same. The reference numerals are given and the description thereof is omitted. In addition,
In FIG. 7, of the reference numerals given in FIGS. 1, 4, 6 and 9, only representative reference numerals are shown.

In FIG. 7, 1C is a fuel cell power generator 1 according to the present invention corresponding to claims 4 and 5 shown in FIG.
In contrast to A, the control device 2C is used in place of the control device 2A, and the auxiliary fuel supply pipe line 6B as an auxiliary fuel supply means is provided. As shown in FIG. 8, the control device 2C is provided with a deficiency heating amount calculation unit 28 and a required auxiliary fuel supply amount calculation unit 29 in addition to the control device 2A. Therefore,
The control device 2C outputs a signal 2Aa which is a signal corresponding to the required air amount and a signal 2Ba which is a signal corresponding to the required auxiliary fuel supply amount.

In the fuel cell power generator 1C, if the heating device 412 provided in the fuel gas supply device 4A has a sudden increase in the load device 99 and the heating amount generated in the heating device 412 becomes insufficient, the signal 2Ba is output. Amount of auxiliary fuel 6B according to
When a is supplied and the load device 99 is suddenly reduced and the heating amount generated in the heating device 412 becomes excessive, the supply amount of the fuel exhaust gas 7a is reduced to the amount according to the signal 2Aa.

Since the embodiments shown in FIGS. 7 and 8 have the above-mentioned configuration, the signals 2Aa and 2Ba output by the controller 2C are output.
Based on the fuel exhaust gas 7 supplied to the heating device 412
a or the supply amount of the auxiliary fuel 6Ba is based on the value of the output current 9A output from the fuel cell 4
In order to match the required supply amount corresponding to the A value, the fuel exhaust gas 7a is constantly controlled according to the excess / deficiency state. As a result, the reforming catalyst included in the fuel gas supply device 4A is generated even when the load device 99 has an abnormal operating state different from the output current corresponding to the operating condition of the fuel cell power generator from the central control device or the like. It is possible to maintain the temperature of the section at a desired temperature.

The control devices 2, 2A, 2B, 2C described in the first to fourth embodiments may be, for example, digital electronic control devices using MPU, in which case the control devices 2, 2A, 2B, 2C. If necessary, a ROM may be mounted in the arithmetic unit provided in, and the functions, coefficients, etc. used for each arithmetic may be stored in this ROM.

[0049]

Since the present invention has the above-mentioned structure, it has the following effects. That is, based on the signal output by the control device, the supply amount of air as cooling air, the supply amount of fuel exhaust gas, or the supply amount of fuel exhaust gas, which is supplied to the heating device provided in the fuel gas supply device, or
The supply amount of auxiliary fuel is controlled so as to correspond to the output current value of the fuel cell power generator, so that an abnormal operation different from the output current corresponding to the operating condition of the fuel cell power generator from the central control unit, etc. Even if the state occurs in the load device, it becomes possible to maintain the temperature of the reforming catalyst portion of the fuel gas supply device at a desired temperature.

The flow rate adjusting device installed in the fuel exhaust gas supply pipeline is adjusted based on the signal output from the control device, which corresponds to the fuel exhaust gas supply amount to the fuel gas supply device that makes the excess heating amount zero. However, by having a configuration in which the supply amount of the fuel exhaust gas supplied to the heating device is controlled,
When reducing the amount of heat to be supplied by the heating device, the control operation can be performed relatively easily.

The flow rate adjusting device installed in the auxiliary fuel supply line is adjusted on the basis of the signal output from the control device, which corresponds to the auxiliary fuel supply amount to the fuel gas supply device for making the insufficient heating amount zero. However, by adopting a configuration in which the supply amount of the auxiliary fuel supplied to the heating device is controlled, it is possible to shorten the control response delay time when increasing the heating amount to be supplied by the heating device. Become.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 1 to 3 together with its load device.

FIG. 2 is a block circuit diagram of the control device shown in FIG.

FIG. 3 is a block diagram showing a configuration of a main part of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 4 and 5 together with its load device.

FIG. 4 is a block circuit diagram of the control device shown in FIG.

FIG. 5 is a block diagram showing a configuration of a main part of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 6 and 7 together with its load device.

FIG. 6 is a block circuit diagram of the control device shown in FIG.

FIG. 7 is a block diagram showing a configuration of a main part of a fuel cell power generator according to an embodiment of the present invention corresponding to claims 4 to 7 together with its load device.

FIG. 8 is a block circuit diagram of the control device shown in FIG.

FIG. 9 is a block diagram showing a configuration of a main part of a conventional fuel cell power generator together with its load device.

[Explanation of symbols]

 1 Fuel Cell Power Generation Device 2 Control Device 2a Signal 31 Output Current Detection Device 31a Signal 4A Fuel Gas Supply Device 41A Fuel Reformer 411 Reforming Tube 412 Heating Device 62 Flowmeter 62a Signal 8 Air Supply Device 8a Combustion Air 9A Output Current 92 Output current path

Claims (7)

[Claims] 1. A fuel cell device for generating direct current electricity supplied with a fuel gas and an oxidant gas, and a device for producing a fuel gas by reforming a raw fuel with a reforming catalyst,
A fuel gas supply device having a heating device for heating the reforming catalyst, an oxidant gas supply device for supplying an oxidant gas to the fuel cell device, and an exhaust gas of the fuel gas discharged from the fuel cell device as described above. To detect the supply amount of the raw fuel supplied to the fuel gas supply device, the air supply device that supplies combustion air to the heating device, and the fuel gas supply device, and respond to the supply amount of the raw fuel In the fuel cell power generation device including a raw fuel supply amount detection device that outputs a signal to output, an output current detection device that detects the value of the output current output by the fuel cell device and outputs a signal corresponding to this output current value And the signal output from the output current detection device and the signal output from the raw fuel supply amount detection device, calculate the required amount of air in the heating device and output a signal corresponding to this required air amount. A fuel cell power generation device comprising: a control device, wherein the air supply device controls the amount of air supplied by the air supply device based on a signal output from the control device. 2. The fuel cell power generator according to claim 1, wherein the control device determines the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output from the raw fuel supply amount detection device. A fuel component generation amount calculation unit that calculates and outputs a signal corresponding to this fuel component generation amount, and calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output by the output current detection device Then, based on the fuel component consumption amount calculation unit that outputs a signal corresponding to the fuel component consumption amount, the signal output by the fuel component generation amount calculation unit, and the signal output by the fuel component consumption amount calculation unit, An exhaust gas fuel component amount calculation unit that calculates the difference between the component production amount and the fuel component consumption amount, and outputs a signal corresponding to the fuel component amount in the fuel exhaust gas, which is the difference, and an exhaust gas fuel component amount calculation unit output Based on the signal Combustion air amount calculation unit that calculates the required amount of combustion air in the heating device and outputs a signal corresponding to the required combustion air amount, and the signal output from the exhaust gas fuel component amount calculation unit and raw fuel supply amount Based on the signal output from the detection device, the amount of cooling air required to maintain the reforming catalyst part of the fuel gas supply device at a desired temperature is calculated, and the signal corresponding to this cooling air amount is calculated. Based on the reforming catalyst cooling air amount calculating unit that outputs, the signal output by the reforming catalyst cooling air amount calculating unit, and the signal output by the combustion air amount calculating unit, the required reforming catalyst A required air amount calculation unit for calculating a sum of the partial cooling air amount and the required combustion air amount and outputting a signal corresponding to the required air amount to be supplied by the air supply device as a signal of this control device A fuel cell power generator equipped with . 3. The fuel cell power generator according to claim 2, wherein the reforming catalyst part cooling air amount calculation part provided in the control device is based on a signal output from the exhaust gas fuel component amount calculation part. A fuel exhaust gas generation calorie calculator that calculates the amount of heat that can be generated by the amount of fuel component in the exhaust gas and outputs a signal corresponding to this calorific value, and at least the signal output by the fuel component in exhaust gas amount calculator and the raw fuel supply amount detection A reforming catalyst heating amount calculation unit for calculating a heating amount required to keep the reforming catalyst unit of the fuel gas supply device at a desired temperature based on a signal output from the device; Based on the signal output by the heat generation amount calculation unit and the signal output by the reforming catalyst unit heat amount calculation unit, the amount of heat generated by the amount of fuel components in the fuel exhaust gas and the temperature of the reforming catalyst unit are maintained at a desired temperature. Required heating amount and An excess heating amount calculation unit that calculates an excess heating amount that is the difference between the two, and outputs a signal corresponding to this excess heating amount;
Based on the signal output by this excess heat amount calculation unit, the amount of cooling air required to maintain the fuel gas supply device at the desired temperature is calculated, and the signal corresponding to this amount of cooling air is used as the reforming amount. A fuel cell power generation device, comprising: a cooling air amount calculation unit that outputs the catalyst unit cooling air amount calculation unit as a signal. 4. A fuel cell device for generating direct current electricity by receiving supply of a fuel gas and an oxidant gas, and a device for producing a fuel gas by reforming raw fuel with a reforming catalyst,
A fuel gas supply device having a heating device for heating the reforming catalyst, an oxidant gas supply device for supplying an oxidant gas to the fuel cell device, and an exhaust gas of the fuel gas discharged from the fuel cell device as described above. To detect the supply amount of the raw fuel supplied to the fuel gas supply device, the air supply device that supplies combustion air to the heating device, and the fuel gas supply device, and respond to the supply amount of the raw fuel In the fuel cell power generation device including a raw fuel supply amount detection device that outputs a signal to output, an output current detection device that detects the value of the output current output by the fuel cell device and outputs a signal corresponding to this output current value And a flow rate adjusting device installed in a flow path of the fuel exhaust gas supply means through which the fuel exhaust gas flows, for adjusting the supply amount of the fuel exhaust gas supplied to the heating device, and a signal output by the output current detecting device. And a control device that calculates a required amount of fuel exhaust gas in the heating device based on the signal output from the raw fuel supply amount detection device and outputs a signal corresponding to the required fuel exhaust gas amount. A fuel cell power generator characterized in that the flow rate adjusting device is adjusted based on the signal, and the supply amount of the fuel exhaust gas supplied to the heating device is controlled. 5. The fuel cell power generator according to claim 4, wherein the control device determines the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output from the raw fuel supply amount detection device. A fuel component generation amount calculation unit that calculates and outputs a signal corresponding to this fuel component generation amount, and calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output by the output current detection device Then, based on the fuel component consumption amount calculation unit that outputs a signal corresponding to the fuel component consumption amount, the signal output by the fuel component generation amount calculation unit, and the signal output by the fuel component consumption amount calculation unit, An exhaust gas fuel component amount calculation unit that calculates the difference between the component production amount and the fuel component consumption amount, and outputs a signal corresponding to the fuel component amount in the fuel exhaust gas, which is the difference, and an exhaust gas fuel component amount calculation unit output Based on the signal The fuel exhaust gas heat generation amount calculation unit that calculates the amount of heat that can be generated by the fuel component amount in this fuel exhaust gas and outputs a signal corresponding to this heat amount, and the signal output by the fuel component amount in exhaust gas amount calculation unit and the raw fuel supply amount Based on the signal output by the detection device, the required heating amount required to maintain the reforming catalyst part of the fuel gas supply device at the desired temperature is calculated, and the signal corresponding to this heating amount is calculated. Generated by the amount of fuel component in the fuel exhaust gas based on the output signal of the reforming catalyst part heating amount calculation part, the signal output by the reforming catalyst part heating amount calculation part and the signal output by the fuel exhaust gas generation heat amount calculation part The excess heating amount calculation unit that calculates the excess heating amount that is the difference between the heat amount and the required heating amount of the reforming catalyst unit and outputs a signal corresponding to this excess heating amount, and the signal output by the excess heating amount calculation unit Calorific value of fuel exhaust gas Based on the signal output from the calculation unit, calculate the adjustment amount of the flow rate adjustment device that corresponds to the fuel exhaust gas supply amount to the fuel gas supply device that makes the excess heating amount zero, and correspond to this required fuel exhaust gas supply amount And a required fuel exhaust gas supply amount calculation unit that outputs a signal to be output as a signal of the control device. 6. A fuel cell device for generating direct current electricity when supplied with a fuel gas and an oxidant gas, and a device for producing a fuel gas by reforming raw fuel with a reforming catalyst,
A fuel gas supply device having a heating device for heating the reforming catalyst, an oxidant gas supply device for supplying an oxidant gas to the fuel cell device, and an exhaust gas of the fuel gas discharged from the fuel cell device as described above. To detect the supply amount of the raw fuel supplied to the fuel gas supply device, the air supply device that supplies combustion air to the heating device, and the fuel gas supply device, and respond to the supply amount of the raw fuel In the fuel cell power generation device including a raw fuel supply amount detection device that outputs a signal to output, an output current detection device that detects the value of the output current output by the fuel cell device and outputs a signal corresponding to this output current value A device for supplying auxiliary fuel to the heating device, the auxiliary fuel supply means having a flow rate adjusting device for adjusting the supply amount of the auxiliary fuel, the signal output by the output current detecting device, and the raw fuel supply. And a controller for calculating a required amount of auxiliary fuel in the heating device based on the signal output by the amount detection device and outputting a signal corresponding to the required auxiliary fuel supply amount. A fuel cell power generator characterized in that the flow rate adjusting device is adjusted based on the flow rate adjusting device to control the amount of auxiliary fuel supplied to the heating device. 7. The fuel cell power generator according to claim 6, wherein the control device determines the fuel component amount in the fuel gas generated by the fuel gas supply device based on the signal output from the raw fuel supply amount detection device. A fuel component generation amount calculation unit that calculates and outputs a signal corresponding to this fuel component generation amount, and calculates the fuel component amount in the fuel gas consumed in the fuel cell device based on the signal output by the output current detection device Then, based on the fuel component consumption amount calculation unit that outputs a signal corresponding to the fuel component consumption amount, the signal output by the fuel component generation amount calculation unit, and the signal output by the fuel component consumption amount calculation unit, An exhaust gas fuel component amount calculation unit that calculates the difference between the component production amount and the fuel component consumption amount, and outputs a signal corresponding to the fuel component amount in the fuel exhaust gas, which is the difference, and an exhaust gas fuel component amount calculation unit output Based on the signal The fuel exhaust gas heat generation amount calculation unit that calculates the amount of heat that can be generated by the fuel component amount in this fuel exhaust gas and outputs a signal corresponding to this heat amount, and the signal output by the fuel component amount in exhaust gas amount calculation unit and the raw fuel supply amount Based on the signal output from the detection device, the required heating amount required to keep the reforming catalyst part of the fuel gas supply device at the desired temperature is calculated, and the signal corresponding to this heating amount is output. Based on the signal output by the reforming catalyst heating amount calculation unit, the signal output by the reforming catalyst heating amount calculation unit, and the signal output by the fuel exhaust gas heat generation amount calculation unit described above, the amount of heat generated by the fuel component amount in the fuel exhaust gas And the required heating amount of the reforming catalyst unit, an insufficient heating amount is calculated, and a signal corresponding to this insufficient heating amount is output, and a signal output by this insufficient heating amount calculation unit is used as a basis. And set the underheating amount to zero. Fuel supply quantity of the auxiliary fuel to the gas supply apparatus calculates a fuel cell power generation system characterized by comprising a predetermined auxiliary fuel supply amount calculating unit for outputting a signal corresponding to the required auxiliary fuel supply amount.