JP2002083606A - Polyelectrolyte type fuel cell co-generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a time pattern which includes a warm-up time, starting from a start until the initiation of supplying electric power and hot water, and termination time of system which includes stopping time of power generation and hot water formation, in a fuel cell cogeneration system. SOLUTION: The fuel cell is operated according to a predetermined time pattern. Then, electric power pattern actually consumed is recorded in advance, and the time pattern prescribed in advance is corrected, based on this record.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cogeneration system using a polymer electrolyte fuel cell which supplies fuel such as city gas and simultaneously performs power generation and hot water supply.

[0002]

2. Description of the Related Art An outline of a conventionally proposed cogeneration system using a polymer electrolyte fuel cell will be described below.

FIG. 1 shows an example of a conventionally proposed system. In FIG. 1, reference numeral 11 denotes a hydrogen generator, which uses city gas, propane gas, or the like as a fuel, and adds air and water to the fuel to generate hydrogen gas. Normally, hydrogen gas generated by the hydrogen generator 11 has several tens of pp as impurities.
Contains about m carbon monoxide. Reference numeral 12 denotes a main body of the fuel cell, which performs a power generation operation by using the above-described hydrogen gas as a fuel and charging it with air. Fuel cells are used for power generation.
It generates heat and must be cooled to adjust it to a temperature suitable for operation. For this purpose, cooling water is usually circulated through the fuel cell body. When the cooling water is passed through a fuel cell that is performing a power generation operation, the cooling water becomes high-temperature hot water, and hot water can be supplied by supplying the hot water to a user.

[0004] On the other hand, the electric power generated by the fuel cell is DC power, and an inverter 14 for converting the electric power to 100 V AC is required. Power is supplied through this converter. A control unit 13 is connected to the hydrogen generator 11, the fuel cell 12, and the inverter 14, and controls the operation of the system.

Next, a specific configuration example of the hydrogen generator 11 will be described with reference to FIG. In FIG. 2, reference numeral 21 denotes a desulfurization unit.
At present, several ppm of tertiary butyl mercaptan and dimethyl sulfide are added to city gas as odorants. This additive must be removed up to about 100 ppb because it interferes with the reforming reaction that converts city gas to hydrogen gas in the hydrogen generator. As this removal method, a method of chemically decomposing or a method of physically removing the same using an adsorbent has been proposed.

Reference numeral 22 denotes a reforming section, which uses a hydrocarbon component such as city gas, natural gas, LPG or the like or an alcohol such as methanol as a raw material, and generates a hydrogen gas by a chemical reaction therefrom. This chemical reaction is called a reforming reaction. In the reforming reaction, CH4 + 2H2O → 4H2 reacts the raw material with water.
A steam reforming reaction represented by + CO2 is common. In this reaction, a Ni-based metal or a noble metal is used as a catalyst. The catalyst is supported on a base material such as ceramic,
Heating to about 00 ° C., and blowing the raw material and steam into this generates hydrogen gas. At this time, about 10% of carbon monoxide is produced as a by-product. The characteristics of the polymer electrolyte fuel cell are greatly reduced when carbon monoxide is mixed into the fuel, and this must be reduced to about 20 ppm. In order to reduce the carbon monoxide by-produced in the reforming section 22 to this level, the shift section 23 and the purification section 2
4 is attached to the downstream side of the reforming section 22.

The metamorphic section 23 is filled with an Fe-Cr-based metal or Cu-Zn-based metal used as a catalyst, which is carried on a base material such as ceramic. This catalyst is
The mixture is heated to 0 ° C., and the reformed gas generated in the reforming section 22 is injected therein. The concentration of the carbon monoxide in the reformed gas that has passed through the shift unit 23 is reduced to about 1%. This gas is called a modified gas.

Reference numeral 24 denotes a purifying unit which reduces carbon monoxide contained in the shift gas to about 20 ppm. The purification unit selectively oxidizes or methanates carbon monoxide using a Pt or Ru-based catalyst,
Reduce to a level of about 20 ppm.

In the above configuration, the reaction and the catalyst used in the reforming section 22, the shift section 23 and the purifying section 24 are different from each other, and the reaction temperature is also different. Therefore, each catalyst must be individually heated to the reaction temperature. It is necessary to heat the reforming section located upstream with respect to the flow of the raw material gas to a high temperature of about 700 ° C., and the reformed gas coming out of the reforming section 22 is naturally at a high temperature close to this. In order to use this heat effectively, heating the catalyst in the shift
A configuration using heat of the reformed gas has been proposed. However, in the method of heating the shift part with the heat of the reformed gas, it is necessary to heat a catalyst having a large heat capacity with a gas having a small heat capacity. For this reason, some time is required until the catalyst temperature of the shift unit is heated to a predetermined temperature.

On the other hand, in the case of steam reforming of a hydrocarbon-based fuel, water must be supplied in an amount exceeding the number of carbon atoms in the fuel in order to prevent carbon from being precipitated in the reforming reaction. For example, when a hydrocarbon such as methane and LPG is used as a raw material, it is common practice to supply water having at least 2.5 times the number of carbon atoms to advance steam reforming. For this reason,
The reformed gas generated by the above reforming reaction contains steam. When the metamorphic section is heated with the reformed gas in such a state, water in the reformed gas may condense in a low temperature portion of the gas passage of the metamorphic section. Condensation of water becomes an impediment to maintaining the temperature of the catalyst in the shift section stably. Since the temperature of the condensed water is not higher than the boiling point, it is necessary to rapidly evaporate the water in order to raise the temperature of each reaction section.

Next, a specific configuration example of the fuel cell 12 shown in FIG. 1 will be described. A fuel cell using a polymer electrolyte generates electricity and heat at the same time by electrochemically reacting a fuel gas containing hydrogen and an oxidizing gas containing oxygen such as air. . As shown in FIG. 3, the structure is such that a catalyst reaction layer 32 mainly composed of a carbon powder carrying a platinum-based metal catalyst is formed on both surfaces of a polymer electrolyte membrane 31 for selectively transporting hydrogen ions. Form. At present, perfluorosulfonic acid having the chemical structure shown in Chemical Formula 1 is generally used as the polymer electrolyte membrane 31. Next, on the outer surface of the catalytic reaction layer, a diffusion layer 33 is formed of, for example, carbon paper having both gas permeability and electron conductivity, and the diffusion layer and the catalytic reaction layer are collectively referred to as an electrode 34. .

[0012]

Embedded image

Next, a gas sealing material or a gasket is arranged around the electrode with a polymer electrolyte membrane interposed therebetween so that the supplied fuel gas does not leak outside or the two types of fuel gas do not mix with each other. This sealing material and gasket are integrated with the electrode and polymer electrolyte membrane beforehand,
This is referred to as MEA (electrode electrolyte membrane assembly) 35.

Next, in FIG. 4, a conductive separator plate 41 for mechanically fixing the MEA is provided outside the MEA.
Place. In a portion of the separator plate 41 which comes into contact with the MEA 35, a gas flow path 42 for supplying a reaction gas to the electrode surface and carrying away generated gas and surplus gas is formed. Although the gas flow path can be provided separately from the separator plate, a method of providing a gas flow path by providing a groove on the surface of the separator is general. Thus, the MEA 35 is formed by the pair of separators 41.
Is fixed, the fuel gas is supplied to one gas flow path, and the oxidizing gas is supplied to the other gas flow path, so that an electromotive force of about 0.8 V can be generated. A cell in which the MEA is fixed by a pair of separators is referred to as a unit cell 43. However, usually, when a fuel cell is used as a power supply, a voltage of several volts to several hundred volts is required. Therefore, in practice, the required number of unit cells 43 are connected in series. At this time, the gas passages 42 are formed on both sides of the separator 41, and the separator / MEA / separator / MEA is repeated to form a series connection configuration.

In order to supply the fuel gas to the gas flow path, a pipe jig for dividing the pipe for supplying the fuel gas into the number of separators to be used and connecting the branch directly to the separator-like groove is required. Become. This jig is called a manifold, and the type directly connected from the fuel gas supply pipe as described above is called an external manifold. There is a type of this manifold called an internal manifold which has a simpler structure. In the internal manifold, a through hole is provided in a separator plate in which a gas flow path is formed, an inlet / outlet for gas flow is passed to the hole, and fuel gas is supplied directly from the hole.

Since the fuel cell generates heat during operation, cooling water or the like is circulated in order to maintain the battery in a good temperature state.
Requires cooling. Usually, a cooling unit for flowing cooling water every 1 to 3 cells is inserted between the separators. In many cases, a cooling water flow path is provided on the back surface of the separator to serve as a cooling unit. The configuration of the front surface of the separator is shown in FIG. 5A, and the configuration of the back surface is shown in FIG. 5B.
FIG. 5A shows a case where a flow path for a fuel gas or an oxidizing gas is formed, and FIG. 5B shows a case where a groove for circulating cooling water is formed. In FIG. 5A, reference numeral 51a denotes a hole for injecting a fuel gas.
b is a hole for discharging this gas. 52a is a hole for injecting the oxidizing gas, and 52b is a hole for discharging this gas. 53a is a hole for injecting cooling water, and 53b is a hole for discharging it. The fuel gas injected from 51a is supplied to the concave portion 5 of the gas flow path.
Through 4, it is guided to 51 b while meandering. 5
Reference numeral 5 denotes a convex portion of the gas flow path. Reference numeral 56 denotes a sealant for sealing the fuel gas, the oxidant gas, and the cooling water.

Further, the separator used in such a polymer electrolyte fuel cell has high conductivity, high gas tightness with respect to the fuel gas, and is resistant to a reaction when redoxing hydrogen / oxygen. High corrosion resistance, that is, acid resistance. For this reason, the conventional separator forms a gas channel by cutting on the surface of a glassy carbon plate, or puts expanded graphite powder together with a binder into a press die with gas channel grooves, and presses it. After processing, it was produced by heating and firing.

In recent years, attempts have been made to use a metal plate such as stainless steel in place of a conventionally used carbon material. In a separator using a metal plate, the metal plate is exposed to an oxidizing atmosphere at a high temperature, so that the metal plate is corroded or dissolved when used for a long period of time. When the metal plate is corroded, the electric resistance of the corroded portion increases, and the output of the battery decreases. Further, when the metal plate is dissolved, the dissolved metal ions diffuse into the polymer electrolyte and are trapped at ion exchange sites of the polymer electrolyte. As a result, the ion conductivity of the polymer electrolyte itself decreases. In order to avoid such deterioration, it has been customary to apply gold plating having a certain thickness to the surface of the metal plate.

Further, as proposed in JP-A-6-333580, a separator made of a conductive resin made by mixing a metal powder with an epoxy resin or the like is being studied.

The MEA, the separator, and the cooling section as described above are alternately stacked, and 10 to 200 cells are stacked. Then, the stack is sandwiched between end plates via a current collector plate and an insulating plate, and fixed from both ends with fastening bolts. This is a general structure, which is called a fuel cell stack. This is shown schematically in FIG.
In FIG. 6, reference numeral 61 denotes a unit cell, which is stacked in a required number. An end plate 62 is tightened up by a plurality of fastening bolts 63. 64a, 65a and 66a are holes for oxidizing gas, fuel gas and cooling water injection, respectively.
Reference numerals b, 65b, and 66b denote holes for these discharges, respectively.

[0021]

However, the fuel cell cogeneration system having the above-described structure requires a so-called warm-up time from the start of the system to the start of supply of electric power and hot water. It is.
Further, even when the system is stopped, the power generation and the generation of hot water are not stopped instantaneously. That is, in the fuel cell cogeneration system, starting and stopping the system are insensitive, and in order to compensate for this, it is necessary to provide a power storage unit and a hot water storage tank. However, when a currently available lead storage battery is used for the power storage unit, the storage capacity is also limited, and the capacity is reduced by repeating the charge / discharge cycle, so that the power generated by the fuel cell cannot be stored, There may be situations where you have to throw it away. In addition, if the power load exceeds the power obtained from the fuel cell, the shortage can be supplied from commercial power, and in the opposite case, the power can be sold by reverse power flow. Since it is extremely low, there is also a problem that the more electricity is sold, the higher the running cost becomes.

Further, when hot water is supplied, it takes a long time for hot water to be stored in the hot water storage tank, and when the outside air temperature is low, such as in winter, the temperature of the hot water is low. . Therefore, the hot water supply tank needs to be made of a heat insulating structure, and further needs to be equipped with a heater for heating. Then, electric power for operating the heater is supplied from the fuel cell, so-called conversion efficiency is reduced, and the advantage of introducing the fuel cell cogeneration system is reduced. In addition, when the hot water supply load is large, a separate hot water heater must be installed, and in this case, there is a problem that the advantage of introducing the fuel cell cogeneration system is further reduced.

In consideration of the above-mentioned problems of the conventional polymer electrolyte fuel cell cogeneration system, the present invention stably supplies high-temperature hot water in a short time, It is intended to provide economical benefits even when is large.

[0024]

In order to achieve the above object, a polymer electrolyte fuel cell cogeneration system of the present invention comprises a hydrogen generator for generating a fuel gas containing hydrogen from a hydrocarbon-based raw material, A polymer electrolyte fuel cell that generates power using the fuel gas and the oxidant gas obtained by the hydrogen generator, and heat generated by at least one of the hydrogen generator and the polymer electrolyte fuel cell A cooling water circulating unit, a hot water storage tank for storing at least a part of heat obtained in the cooling water circulating unit, a power storage unit for storing at least a part of electric power generated in the polymer electrolyte fuel cell, and the polymer A power conversion unit that converts DC power generated by the electrolyte fuel cell into AC power, a power system cooperation control unit that performs system cooperation between the AC power and commercial power, and the hydrogen generation unit. And a system control unit that controls the operation of the polymer electrolyte fuel cell, the cooling water circulation unit, the power storage unit, the power conversion unit, and the power system cooperation control unit, and supplies power and hot water to a user. A polymer electrolyte fuel cell cogeneration system,
The system control unit supplies time transitions of the power consumption and hot water consumption of the user and supplies the hydrogen generator required for the polymer electrolyte fuel cell cogeneration system to generate a predetermined amount of power and supply hot water. The amount of the hydrocarbon-based raw material to be input is input in advance, and the polymer electrolyte fuel cell cogeneration system is operated according to the input value, and simultaneously with the operation, the power and hot water supply actually consumed by the user are calculated. By recording and correcting a predetermined time transition of the user's power consumption and hot water consumption based on the recorded value, the amount of the hydrocarbon-based raw material supplied to the hydrogen generator is controlled. I do.

[0025]

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

(First Embodiment) FIG. 7 shows a configuration of a polymer electrolyte fuel cell cogeneration system according to a first embodiment of the present invention. City gas is blown into a hydrogen generator 72 via a blower 71. The hydrogen gas generated by the hydrogen generator 72 is supplied to a fuel cell 74 after being humidified by a humidifier 73. The oxidizing gas supplied to the fuel cell 74 is introduced into the air from a blower 75 and humidified by a humidifier 76. The DC power generated by the fuel cell 74 is sent to the power control unit 79, and is supplied to consumers while being system-linked with the power storage unit 710 and commercial power. The air discharged from the fuel cell 74 is cooled by outside air in the condenser 77 and dehumidified. The obtained condensed water is stored in the hot water storage tank 78. The recovered water is sent to the hydrogen generator 72 and the humidifier 73 and used for fuel reforming and fuel-side humidification.

Since the fuel cell 74 generates heat, the water supply 71
Inject cooling water from 1. This cooling water is supplied to the fuel cell 74.
Circulates into hot water of about 90 ° C.
To 8. A thermistor and a heater are installed in the hot water storage tank 78, and the stored hot water is controlled so as to reach a predetermined temperature.

FIG. 8 shows the details of the power control section 79. In FIG. 8, the central control unit 84 includes a voltage converter 81 and a DC / A
C inverter 82, storage unit 83, fuel cell 74
And the power storage unit 710 to be system-connected to AC commercial power. The operation is to increase or decrease the DC power from the fuel cell 74 to a predetermined voltage by the voltage converter 81, receive a power request from an external load, and store a surplus in the battery 710 when the amount of power generation is large, When power generation is insufficient, AC
Replenish power from commercial power. At this time, when power is sent to an external load and AC commercial power, DC / DC conversion is performed by the DC / AC inverter 82. The central control unit 84 includes the hydrogen generator 72 of FIG. 7 and the blower 7 of the air injection unit.
5. The operation of the blower 71 of the city gas injection unit is also controlled.
The storage battery 710 is a module in which ten lead-acid batteries rated at 12 V and 50 Ah are connected in series, and three modules are connected in parallel to obtain 120 V × 1.
50Ah = 18kWh.

In the above-mentioned system, the fuel cell has an electrode area of 180 cm 2 and a single cell of 8 fuel cells.
Zero batteries were stacked in series to make a battery module. The operating conditions are
The injection temperature of the cooling water for the fuel cell was set to 75 ° C., and humidified air was injected to the air electrode side such that the outdoor temperature became 50 ° C. The injection amount of air was controlled so that the oxygen utilization at this time was 40%. Further, a humidified reformed gas was injected into the fuel electrode side so that the outdoor temperature became 70 ° C. The injection amount of the reformed gas was controlled so that the hydrogen utilization at this time was 70%. The above operating conditions are the conditions for rated operation. At this time, 2 kW at a battery voltage of 56 V and a current of 36 A
To obtain the amount of power generated. The reformed gas is supplied from the above-described hydrogen generator using city gas as a raw material. With the above operation, to reduce the amount of power generation, reduce the amount of city gas injected during the hydrogen generation period,
This is performed by reducing the reformed gas to the fuel cell, and in conjunction with this, reducing the amount of air injected into the fuel cell, thereby reducing the current value.

The point of the present invention is that, using the storage unit 83 in FIG. 8, the time transition of the power consumption and hot water consumption of the user and the supply to the hydrogen generator required for generating a predetermined amount of power and hot water supply. And the amount of city gas to be used is input in advance, and the operation of the system is controlled according to the input value. Further, the power actually consumed by the user and the amount of hot water supplied at the same time as the driving are recorded, and the recorded values are corrected based on the recorded values.

FIG. 9 shows an example of the required power pattern. FIG. 10 shows an example of a hot water supply request pattern. FIG. 9 and FIG. 10 are four families of a family consisting of a husband of an office worker, a housewife, and two children of elementary school children, which were monitored on May 1. From FIG. 9, it was found that household power consumption was concentrated in the morning and evening, and was small at midnight. Hot water supply was close to this, and it turned out that the amount of hot water was particularly large at the time of evening bathing. Therefore, according to the power generation pattern shown in FIG.
The power generation of the fuel cell was forcibly performed.

The purpose of the power generation amount pattern shown in FIG. 11 is as follows. First, from 0:00 am to 7:00 am, a power of 0.4 kW determined as the minimum amount is generated, and the surplus power from the actual consumption is stored in the battery 710 to prepare for the morning peak from 7:00 to 9:00. From 7:00 to 9:00, the amount of power generation is 1.
The power is set to 2 kW, and the shortage in actual use is replenished from the battery 710. Next, the operation is performed at 0.6 kW from 9:00 to 12:00, and the operation is performed at 1.0 kW from 12:00 to 14:00. From 14:00 to 18:00, it is operated again at 0.6 kW, and from 18:00 to 20:00, which is the peak of the day, 1.8.
kW operation is performed. From 10:00 to 22:00 this is 1.
After dropping to 2 kW, the time between 22:00 and 24:00 was 0.6 again.
kW.

Next, the operation of the fuel cell was actually performed in accordance with the power generation pattern shown in FIG. 11, and the amount of power consumption actually used was monitored. The results are shown in FIG. As a result, the difference between the total power generation amount of the power generation putter shown in FIG. 11 and the total power generation amount actually consumed shown in FIG. 12 is larger by 2 kWh in the total power generation amount of the power generation putter shown in FIG. This difference was covered by storing electricity in the battery 710. next,
The time pattern of the actually used power consumption shown in FIG. 12 is corrected by performing time averaging processing, and this is set as a new power generation pattern, and is shown in FIG. Then, the day operation was performed in the pattern shown in FIG. The operation of the next day was performed according to the pattern shown in FIG. 13, and as a result, the difference between the total power generation amount of the power generation putter shown in FIG. The total power generation was lower by 0.5 kWh.

As a result of the above operation, the operation pattern assumed in advance and the actually consumed electric power pattern did not completely match. However, by adopting such an operation method, the polymer electrolyte type It was possible to cover the delay of the time tracking of the cogeneration system using the fuel cell.

[0035]

As described above, the present invention eliminates the time lag between the electric power supply and hot water supply required by the consumer and the electric power and hot water supply that can be made by the fuel cell, thereby realizing the actual operation. The conversion efficiency at the time was able to be improved. Furthermore, high-temperature hot water can be supplied stably,
It was possible to respond quickly even when the power load fluctuated, and to operate in response to an increase in the hot water supply load. In short, a comfortable and economical system was realized.

[Brief description of the drawings]

FIG. 1 shows a general configuration of a cogeneration system using a fuel cell.

FIG. 2 is a diagram showing a general configuration of a hydrogen generator.

FIG. 3 is a cross-sectional view showing the configuration of an MEA that is a component of the fuel cell.

FIG. 4 is a cross-sectional view showing a configuration of a fuel cell.

FIG. 5 is an external view showing a configuration of a separator which is a component of the fuel cell.

FIG. 6 is an external view showing the configuration of a fuel cell.

FIG. 7 is a diagram showing a configuration of a cogeneration system according to an embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a power control unit which is a component of a cogeneration system according to an embodiment of the present invention.

FIG. 9 is a diagram showing a power request pattern;

FIG. 10 is a diagram showing a hot water supply request pattern;

FIG. 11 is a view showing a predetermined power generation pattern of a fuel cell.

FIG. 12 is a diagram showing a pattern of power consumption actually used;

FIG. 13 is a diagram showing a power generation pattern of a fuel cell after correction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Hydrogen generator 12 Fuel cell 13 Control part 14 AC-DC converter 21 Desulfurization part 22 Reforming part 23 Modification part 24 Purification part 31 Hydrogen ion conductive polymer electrolyte membrane 32 Catalytic reaction layer 33 Diffusion layer 34 Electrode 35 MEA 41 Separator 42 Gas flow groove 43 Single cell 51a Hole for injecting fuel gas 51b Hole for discharging fuel gas 52a Hole for injecting oxidizing gas 52b Hole for discharging oxidizing gas 53a Injecting cooling water Hole 53b hole for discharging cooling water 54 concave portion of gas flow channel 55 convex portion of gas flow channel 56 sealing material 61 unit cell 62 end plate 62b end plate 63 fastening bolt 64a hole for oxidant gas injection 64b Hole for fuel gas injection 65a Hole for cooling water injection 65b Hole for oxidant gas discharge 66a Hole for fuel gas discharge 6 b Hole for cooling water discharge 71 Blower 72 Hydrogen generator 73 Humidifier 74 Fuel cell 75 Blower 76 Humidifier 77 Condenser 78 Hot water storage tank 79 Power control unit 710 Power storage unit 711 Water supply unit 81 Voltage converter 82 DC / AC inverter 83 Storage unit 84 Central control unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) // G05F 1/67 G05F 1/67 B (72) Inventor Takeshi Tomizawa 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Inside Electric Industry Co., Ltd. FF05 NB04 NE02

Claims (1)

[Claims] 1. A hydrogen generator for generating a fuel gas containing hydrogen from a hydrocarbon-based raw material, and a polymer electrolyte type for generating electric power using the fuel gas and the oxidizing gas obtained by the hydrogen generator. A fuel cell, a cooling water circulation unit that recovers heat generated in at least one of the hydrogen generator or the polymer electrolyte fuel cell, and a hot water storage tank that stores at least a part of the heat obtained in the cooling water circulation unit. A power storage unit that stores at least a part of the power generated by the polymer electrolyte fuel cell; a power conversion unit that converts DC power generated by the polymer electrolyte fuel cell into AC power; A power system cooperation control unit for performing system cooperation with electric power, the hydrogen generator, the polymer electrolyte fuel cell, the cooling water circulation unit, the power storage unit, the power conversion unit, and the power system cooperation control. A polymer electrolyte fuel cell cogeneration system comprising a system control unit that controls the operation of the unit, and performs power supply and hot water supply to a user,
The system control unit supplies time transitions of the power consumption and hot water consumption of the user and supplies the hydrogen generator required for the polymer electrolyte fuel cell cogeneration system to generate a predetermined amount of power and supply hot water. And the amount of the hydrocarbon-based raw material to be input in advance, operating the polymer electrolyte fuel cell cogeneration system according to the input value, and recording the amount of power actually consumed by the user simultaneously with the operation. Correcting a predetermined time transition of the power consumption of the user based on the recorded value, thereby controlling an amount of the hydrocarbon-based raw material supplied to the hydrogen generator. Fuel cell cogeneration system.