Abstract: The purpose of the present invention is to provide fuel cell system capable of stable start-up and method for starting the fuel cell system. Fuel cell system includes SOFC, a turbocharger, oxidizing gas supply line, a control valve, oxidizing gas blow line, start-up air line for supplying the start-up air to the oxidizing gas supply line with a blower, and a control unit that, in state in which the control valve is closed and the blow valve is opened to supply the start-up air to the oxidizing gas supply line with the blower when the turbocharger is started, decreases the opening of the blow valve and, after the timing at which the opening of the blow valve starts to decrease, increases the opening of the control valve and then stops the supply of the starting air.

Abstract: The purpose of the present invention is to provide: fuel cell system that can further stabilize an operation of the system; and control method thereof. Fuel cell system comprises: fuel cell; a turbocharger; oxidizing gas supply line that supplies, to cathode, oxidizing gas compressed by a compressor; a heat exchanger that heats the oxidizing gas of the oxidizing gas supply line by means of exhaust gas discharged from a turbine, and flows the exhaust gas to combustion exhaust gas line; bypass lines each having one end connected to the upstream side of the heat exchanger in the oxidizing gas supply line and bypassing the oxidizing gas; flow rate regulating valves provided in the bypass lines; and a control unit that controls the flow rate regulating valves on the basis of the ambient air temperature, and controls the bypass flow rate of the oxidizing gas.

Abstract: The purpose of the present invention is to provide fuel cell system capable of stable start-up and method for starting the fuel cell system. Fuel cell system includes SOFC, a turbocharger, oxidizing gas supply line, a control valve, oxidizing gas blow line, start-up air line for supplying the start-up air to the oxidizing gas supply line with a blower, and a control unit that, in state in which the control valve is closed and the blow valve is opened to supply the start-up air to the oxidizing gas supply line with the blower when the turbocharger is started, decreases the opening of the blow valve and, after the timing at which the opening of the blow valve starts to decrease, increases the opening of the control valve and then stops the supply of the starting air.

Abstract: The purpose of the present invention is to provide fuel cell system capable of stably executing differential pressure control and having a simplified configuration, and method for controlling the same. Fuel cell system equipped with fuel cell, a turbocharger, exhaust fuel gas line, exhaust oxidizing gas line, combustion gas supply line for supplying combustion gas discharged from a combustor to a turbine, oxidizing gas supply line for supplying oxidizing gas compressed by a compressor to cathode, a regulator valve provided to the exhaust fuel gas line, and a control unit for controlling the differential pressure between the pressure of the cathode of the fuel cell and the pressure of the anode thereof by controlling the regulator valve, wherein the exhaust oxidizing gas line is not provided with venting system for discharging exhaust oxidizing gas outside the system.

Abstract: The purpose of the present invention is to provide: fuel cell system that can further stabilize an operation of the system; and control method thereof. Fuel cell system comprises: fuel cell; a turbocharger; oxidizing gas supply line that supplies, to cathode, oxidizing gas compressed by a compressor; a heat exchanger that heats the oxidizing gas of the oxidizing gas supply line by means of exhaust gas discharged from a turbine, and flows the exhaust gas to combustion exhaust gas line; bypass lines each having one end connected to the upstream side of the heat exchanger in the oxidizing gas supply line and bypassing the oxidizing gas; flow rate regulating valves provided in the bypass lines; and a control unit that controls the flow rate regulating valves on the basis of the ambient air temperature, and controls the bypass flow rate of the oxidizing gas.

Abstract: A fuel cell module comprises: a plurality of single fuel cells each of which includes an anode, an electrolyte, and a cathode; a fuel gas supply pipe for supplying a fuel gas to the anode; an oxidant supply pipe for supplying an oxidized gas to the cathode of the plurality of single fuel cells, the oxidant supply pipe including a first line and a plurality of second lines each of which branches from a branch point at a downstream end of the first line and is connected to one or more single fuel cells; and at least one heating fuel gas supply pipe connected to the second line downstream of the branch point.