Abstract: A hydrogen generator includes: a reformer configured to generate a hydrogen-containing gas by a reforming reaction using a material gas; a hydro-desulfurizer configured to remove a sulfur compound in the material gas; a material gas passage through which the material gas supplied to the reformer flows; a recycled gas passage connected between a first connection portion of a gas passage located downstream of the reformer and a second connection portion of the material gas passage located upstream of the hydro-desulfurizer; a first on-off valve disposed on the recycled gas passage; a second on-off valve disposed on the material gas passage between the second connection portion and the hydro-desulfurizer; and a controller configured to open the first on-off valve, after generation stop of the hydrogen-containing gas, to supply the material gas to the recycled gas passage, and to close the second on-off valve when the controller opens the first on-off valve.

Abstract: A fuel cell system includes: a fuel cell configured to generate electric power by using a hydrogen-containing gas; a catalyst, which reacts with an oxidizing gas by oxidation; an oxidizing gas supply device configured to supply the oxidizing gas to the catalyst; and a controller configured to control, before removal of the catalyst to outside, the oxidizing gas supply device to perform an oxidizing process of oxidizing the catalyst.

Abstract: A hydrogen generator comprises a reformer configured to generate a hydrogen-containing gas through a reforming reaction using a raw material; a hydrodesulfurization unit configured to remove a sulfur compound from the raw material; a recycle passage configured to flow therethrough the hydrogen-containing gas to be added to the raw material in a state before the raw material flows into the hydrodesulfurization unit, the recycle passage having a downward slope; and a water drain passage configured to discharge condensed water generated in the downward slope of the recycle passage.

Abstract: A cogeneration system including a power generator, a first circulation passage, a first heat medium circulator, a first heater, a first temperature detector, a first tank, a first valve, and a controller. The first heat medium circulator is configured to cause a first heat medium to flow from the first heater toward the first temperature detector. The controller performs a first heating operation of heating the first heat medium by the first heater and activating the first heat medium circulator. In a case where a temperature detected by the first temperature detector after the first heating operation is lower than a preset first predetermined temperature or in a case where a temperature difference between the temperatures detected by the first temperature detector before and after the first heating operation is a temperature change smaller than a preset first temperature difference, the controller determines that the cogeneration system is abnormal.

Abstract: A fuel cell system includes: a fuel cell configured to generate electric power by using a hydrogen-containing gas; a catalyst, which reacts with an oxidizing gas by oxidation; an oxidizing gas supply device configured to supply the oxidizing gas to the catalyst; and a controller configured to control, before removal of the catalyst to outside, the oxidizing gas supply device to perform an oxidizing process of oxidizing the catalyst.

Abstract: A hydrogen generator comprises a reformer configured to generate a hydrogen-containing gas through a reforming reaction using a raw material; a hydrodesulfurization unit configured to remove a sulfur compound from the raw material; a recycle passage configured to flow therethrough the hydrogen-containing gas to be added to the raw material in a state before the raw material flows into the hydrodesulfurization unit, the recycle passage having a downward slope; and a water drain passage configured to discharge condensed water generated in the downward slope of the recycle passage.

Abstract: A hydrogen generator (100) includes: a reformer (1) configured to generate a hydrogen-containing gas by a reforming reaction using a material gas; a hydro-desulfurizer (2) configured to remove a sulfur compound in the material gas; a recycled gas passage (9) through which the hydrogen-containing gas added to the material gas before the material gas flows into the hydro-desulfurizer (2) flows; a first on-off valve (3) disposed on the recycled gas passage (9); a material gas passage through which the material gas supplied to the reformer (1) flows; a second on-off valve (5) disposed on a portion of the material gas passage, the portion being located downstream of a connection portion where the material gas passage and the recycled gas passage (9) are connected to each other; and a controller (6) configured to open the first on-off valve (3) after the generation stop of the hydrogen-containing gas to supply the material gas to the recycled gas passage (9), and the controller (6) closes the second on-off valve (5

Abstract: A fuel cell system includes: a fuel cell; a fuel gas supply unit; an oxidizing gas supply unit; an oxidizing gas supply passage; an oxidizing gas discharge passage; an oxidizing gas branch passage; an on-off valve disposed on at least one of the oxidizing gas discharge passage and a portion of the oxidizing gas supply passage; an oxidizing gas supply amount measuring unit disposed on the oxidizing gas branch passage; and a controller configured to determine that the on-off valve is normal in a case where a supply amount of the oxidizing gas measured by the oxidizing gas supply amount measuring unit is equal to or larger than a first threshold and determines that the on-off valve is abnormal in a case where the supply amount of the oxidizing gas measured by the oxidizing gas supply amount measuring unit is smaller than the first threshold.

Abstract: A fuel cell system including: a hydrogen generator for causing a reforming reaction of a material gas to generate a hydrogen-containing fuel gas; a fuel cell configured to cause a reaction between the fuel gas generated by the hydrogen generator and an oxygen-containing oxidizing gas; a combustor configured to combust at least one of the material gas and an off fuel gas discharged from the fuel cell; a casing configured to accommodate the hydrogen generator, the fuel cell, and the combustor; a first exhaust port, formed on the casing and through which the flue gas from the combustor is discharged to an outside of the casing; a first intake port formed on the casing; suction units configured to suction air through the first intake port into the casing; and a CO detector configured to detect carbon monoxide contained in the air suctioned through the first intake port.

Abstract: A fuel cell system according to the present invention includes: a fuel cell (1); an accessory device; a sensor configured to detect an operation state of the fuel cell system; an accessory device abnormality detector (44) configured to detect an abnormality in the accessory device; a sensor abnormality detector (45) configured to detect an abnormality in the operation state of the fuel cell system; and a controller (47).

Abstract: A fuel cell system of the present invention is a fuel cell system including a fuel cell (101) and includes a medium circulation passage (71), a heat medium tank (102), a first circulator (105), a recovered water tank (104), a water circulation passage (72), a second circulator (108), a water purifier (109), a temperature detector (111), and a controller (110). The heat medium circulation passage (71) and the water circulation passage (72) are configured so as to realize heat exchange between a heat medium and water. The controller (110) executes a circulation operation in which when the temperature detector (111) detects a temperature lower than a first temperature capable of sterilizing microorganisms, the second circulator (108) is caused to operate such that the temperature detected by the temperature detector (111) becomes the first temperature or higher.

Abstract: A fuel cell system of the present invention includes: a fuel cell apparatus; an exhaust gas passage through which an exhaust gas from the fuel cell apparatus is discharged; and a water tank configured to store water present within the exhaust gas. The water tank includes a first reservoir, a second reservoir, and a communication part which is configured to allow the first reservoir and the second reservoir to communicate with each other at a lower part of the water tank. The second reservoir of the water tank is provided with a drain outlet which is disposed above the communication part. The exhaust gas passage is connected to the first reservoir of the water tank.