Abstract:
A hydrogen generator comprises a reformer configured to generate a hydrogen-containing gas through a reforming reaction in an internal space thereof using a material gas and steam; a material gas supply passage through which the material gas is supplied to the reformer; a material gas supplier which is provided at the material gas supply passage to supply the material gas to the reformer; a first valve configured to open and close the material gas supply passage; an evaporator configured to generate a steam supplied to the reformer; a water supplier configured to supply water to the evaporator; a communicating passage for allowing the reformer to communicate with atmosphere; a second valve configured to open and close the communicating passage; and a controller configured to stop the material gas supplier and the water supplier and close the first valve and the second valve at shutdown of the hydrogen generator; and open the second valve prior to opening the first valve when the material gas supplier resumes supply of the material gas to the reformer after the shutdown.
Abstract:
A cogeneration system of the present invention includes: a fuel cell (1) configured to generate electricity and heat; a hot water tank (2) configured to store hot water having recovered the heat generated by the fuel cell (1); a heat exchanger (7) configured to transfer the heat generated by the fuel cell (1) to the hot water; a hot water passage (8) that is a first heat medium passage configured such that the heat is transferred to the hot water by the heat exchanger (7) and the hot water flows into the hot water tank (2); a heat medium supplier (9) configured to cause the heat medium to flow through the first heat medium passage (8); a hot water supplying passage (11) through which the hot water stored in the hot water tank (2) is supplied to the heat load; an electric power consuming heater (12) configured to heat the hot water flowing through the hot water supplying passage (11) toward the heat load by consuming surplus electric power of the fuel cell (1) and commercial electric power; and a second heat medium passage (A) configured such that the hot water is heated by the electric power consuming heater (12) and flows into the hot water tank (2).
Abstract:
A hydrogen generator that is able to maintain an ability to supply a reformed gas containing less CO for a long time period while dealing with degradation of a catalytic activity of a shift reaction by a reliable and simple method, an operation method thereof, and a fuel cell system are provided. In a hydrogen generator (50) comprising a reformer (1), a shift converter (6), a water supply device (3A), a material feed device (2A), and a controller (12), the controller (12) is configured to count the number of times of start-up and/or stop of said hydrogen generator (50) and to increase a temperature or a S/C ratio of the reformed gas flowing in said shift converter (6) according to the counted number of times of start-up and/or stop.
Abstract:
A fuel cell system (100) according to the present invention includes: a hydrogen generator (1) configured to generate a fuel gas through a reforming reaction by using a raw fuel; a fuel cell (7) configured to generate power by using the fuel gas; a combustor (2) configured to heat the hydrogen generator (1); at least one on-off valve (9A, 9B) configured to open/block a gas passage (9) through which the gas that is sent out from the hydrogen generator (1) is supplied to the combustor (2); and a combustion air supply device (4) configured to supply combustion air to the combustor (2); an ignition device (5) provided at the combustor (2), and a controller (30). The combustor (2) is configured to perform combustion during power generation of the fuel cell (7) by using the gas supplied through the gas passage (9). In a case where accidental flame extinction has occurred at the combustor (2) during the power generation of the fuel cell (7), the controller (30) performs an ignition operation of the ignition device (5) with the on-off valve (9A, 9B) kept opened.
Abstract:
A hydrogen generator comprises a reformer which generates a hydrogen-containing gas from a steam and a material gas, a first gas supply device which supplies the material gas, a combustor which combusts an exhaust gas exhausted from the reformer to heat the reformer, a combustion air supply device which supplies air to the combustor, a second gas supply device which supplies another gas different from the material gas to the reformer or to a passage connecting the reformer to the combustor, and a controller. The controller is configured to control the combustion air supply device to increase an amount of the air supplied to the combustor (S103), in association with start of supply of the another gas from the second gas supply device (S104), in a state where the material gas is supplied from the first gas supply device to the reformer and the exhaust gas is combusted in the combustor (S101).
Abstract:
A fuel cell system of the present invention comprises a fuel cell (101); a first heat medium path through which a first heat medium for cooling the fuel cell (101) flows; a first flow control device (107) configured to flow the first heat medium in the first heat medium path; an abnormality detector configured to detect an abnormality; and a controller (110) configured to control the first flow control device (107) such that the fuel cell (101) after shut-down of power generation is cooled with a higher rate in an abnormal shut-down process performed after the abnormality detector detects the abnormality, than in a normal shut-down process.
Abstract:
A cogeneration system of the present invention includes: a fuel cell (1) configured to generate electricity and heat; a hot water tank (2) configured to store hot water having recovered the heat generated by the fuel cell (1); a heat exchanger (7) configured to transfer the heat generated by the fuel cell (1) to the hot water; a hot water passage (8) that is a first heat medium passage configured such that the heat is transferred to the hot water by the heat exchanger (7) and the hot water flows into the hot water tank (2); a heat medium supplier (9) configured to cause the heat medium to flow through the first heat medium passage (8); a hot water supplying passage (11) through which the hot water stored in the hot water tank (2) is supplied to the heat load; an electric power consuming heater (12) configured to heat the hot water flowing through the hot water supplying passage (11) toward the heat load by consuming surplus electric power of the fuel cell (1) and commercial electric power; and a second heat medium passage (A) configured such that the hot water is heated by the electric power consuming heater (12) and flows into the hot water tank (2).
Abstract:
The hydrogen generator includes: a reformer 101 having a reforming catalyst configured to cause a source material and water to react with each other to generate a hydrogen-rich reformed gas; a reformer heater 104 configured to heat the reformer; a carbon monoxide reducing portion 111,121 having a carbon monoxide reducing catalyst configured to reduce carbon monoxide contained in the reformed gas; a carbon monoxide reduction heater 112,123 configured to heat at least one of the carbon monoxide reducing portion, the carbon monoxide reducing catalyst and the reformed gas passing through the carbon monoxide reducing portion; and a controller 200 capable of control such that the carbon monoxide reduction heater is caused to operate in a stop operation period.
Abstract:
A fuel cell system of the present invention includes: a hydrogen generator (1) having a reformer (1a) configured to generate a hydrogen-containing gas by a reforming reaction using a raw material; a fuel cell (2) configured to generate electric power using the hydrogen-containing gas supplied from the hydrogen generator (1); a combustor (3) configured to combust an anode off gas discharged from the fuel cell (2) to heat the reformer (1a); a CO detector (7) configured to detect a carbon monoxide concentration of a flue gas discharged from the combustor (3); an electric heater (8) configured to heat the CO detector (7); and a controller (19), and the controller (19) is configured to increase an amount of energization to the electric heater (8) in accordance with an increase in an amount of electric power generated by the fuel cell (2).
Abstract:
A method for operating a fuel cell system having a fuel cell equipped with an anode and a cathode includes the steps of generating electric power by allowing hydrogen gas supplied to the anode and oxygen gas supplied to the cathode to react electrochemically with each other, recovering water from water vapor discharged from at least one of the anode and cathode, storing recovered water in a water storing portion equipped with a tank having a closable drain opening, through which opening water stored in the tank is dischargeable to outside the fuel cell system, supplying water stored in the tank to a water utilizing means by a water supply portion, and making a decision whether or not to discharge the stored water to outside the fuel cell system through the drain opening in view of an increase in an amount of undesirable germs contained in water stored in the water storing portion.