The fuel cell control system includes: a reactor; an air compressor, wherein the air compressor has a compressing cavity, the compressing cavity has a gas inlet and a gas outlet, a rotatable pressure wheel is disposed inside the compressing cavity, and the gas outlet is in communication with the reactor; a control flow channel, wherein a first end of the control flow channel is in communication with the gas-intake side of the pressure wheel, a second end of the control flow channel is in communication with the wheel-back side of the pressure wheel, and the control flow channel is provided with a return valve for regulating the flow rate of the control flow channel; and a central control unit, wherein the central control unit is communicatively connected to the return valve to control the opening degree of the return valve.

A fuel cell system includes: a supply flow path configured to supply reactant gas; a first branch flow path branching off from an outlet end of the supply flow path and configured to guide the reactant gas to a first fuel cell stack; a second branch flow path branching off from the outlet end of the supply flow path and configured to communicate with the first branch flow path and guide the reactant gas to a second fuel cell stack; and an inlet area change part disposed in a boundary zone between the first branch flow path and the second branch flow path and configured to selectively change inlet areas of the first and second branch flow paths. Efficiency in discharging condensate water is increased and performance and operational efficiency are improved.

A fuel cell system configured to enhance the life of a fuel cell is provided. The fuel cell system a fuel cell, an oxidant gas supplier configured to supply oxygen-containing oxidant gas to a cathode of the fuel cell, a fuel gas supplier configured to supply hydrogen-containing fuel gas to an anode of the fuel cell, an oxygen partial pressure estimator configured to estimate an oxygen partial pressure of the cathode of the fuel cell, a hydrogen partial pressure estimator configured to estimate a hydrogen partial pressure of the anode of the fuel cell, and a controller, wherein the controller calculates a target hydrogen partial pressure by a given equation (1), and wherein the controller controls the hydrogen partial pressure of the anode to the target hydrogen partial pressure.

Disclosed are a deterioration estimation system for the fuel cell, a hydrogen supply system for a fuel cell including the same, and a hydrogen supply method for a fuel cell, the deterioration estimation system including a fuel cell which receives hydrogen gas and oxidizing gas respectively supplied to an anode side and a cathode side thereof to generate electrical power, a hydrogen supply line which is connected to the anode side of the fuel cell and supplies gas containing hydrogen gas to the fuel cell, a hydrogen supply valve which is located between the hydrogen supply line and a hydrogen tank, supplies, when opened, hydrogen gas stored in the hydrogen tank to the hydrogen supply line, and blocks the supply of the hydrogen gas when closed, and a deterioration estimating unit which estimates the deterioration state of the fuel cell, based on the opening and closing control of the hydrogen supply valve or a change in the pressure in the hydrogen supply line.

A carbon dioxide production system 10A includes: a fuel cell stack 16; a separation unit 20 that separates anode off-gas into a non-fuel gas including at least carbon dioxide and water and a regenerative fuel gas; a second heat exchanger 32 that separates water from the non-fuel gas; a water tank 42; and a carbon dioxide recovery tank 48 that recovers the carbon dioxide after the water has been separated.

The invention relates to a method for operating a fuel cell system, in which method a supply of air to a fuel cell stack (20) is interrupted intermittently, in particular in the event of a standstill of the system, by means of a pressure-controlled shutoff valve (1), which comprises a valve element (4), which valve element can be moved back and forth between two end positions and is preloaded toward a sealing seat (3) by means of the spring force of a closing spring (2). According to the invention, in at least one of the two end positions, the valve element is held in the end position in question additionally by means of the magnetic force of an electromagnet (5) and/or of a permanent magnet (6), the electromagnet (5) and/or the permanent magnet (6) interacting with a magnetic or magnetizable part (7) of the valve element (4). The invention further relates to a shutoff valve (1) suitable for carrying out the method according to the invention and to a fuel cell stack (20) having at least one shutoff valve (1) according to the invention.

An air pressure in fuel cells of an electric power generation system comprising a fuel cell stack (PCS) is raised with a pressurized air cooling system with recirculation to values at least two times greater than typical values for an PCS with air cooling. The FCS is either placed in a high-pressure chamber to which air is injected, or air outgoing from the FCS is redirected via a duct back to the FCS inlet and a portion of pressurized fresh air is added thereto. The chamber or the duct is provided with a radiator by means of which circulating air heat is transferred into the external environment. Air recirculation in the chamber or the duct is effected by means of fans for cooling fuel cells. Useful capacity of electric power generation systems based on fuel cells is raised significantly, the necessity of using a humidifier is excluded, and the temperature range of fuel cell operation is expanded.

An integrated fuel cell and combustor assembly includes a combustor that is fluidly coupled with at least one upstream compressor that generates compressed air. A fuel cell stack having a cathode and an anode is fluidly coupled to the combustor. The fuel cell stack is configured to receive intake fuel and a portion of the compressed air as intake air, to generate a fuel cell power output using the intake fuel and the intake air, and to direct a fuel and air exhaust from the fuel cell stack into the combustor. A self-reliant air supply system is fluidly coupled with the at least one upstream compressor and the fuel cell stack, and is configured to supply the intake air to the fuel cell stack. A fault-tolerant controller is configured to detect a transient event within the combustor and to control the self-reliant air supply system during the transient event.

A fuel battery system includes: a plurality of fuel tanks configured to store fuel; a fuel battery stack configured to generate electricity using the fuel supplied from each of the plurality of fuel tanks; a filling unit configured to fill each of the plurality of fuel tanks with the fuel; and a control device configured to control the fuel battery stack to maintain generating of electricity by continuously supplying fuel from at least any one of the plurality of fuel tanks other than the fuel tank filled with the fuel from the filling unit to the fuel battery stack when at least one of the plurality of fuel tanks is filled with the fuel from the filling unit.

A large-scale proton exchange membrane fuel cell power station process system includes a distributed cell stack module, a modular fuel supply system, a modular oxidant supply system, a modular cooling system, a power transmission and inverter system, and a power station master system. The distributed cell stack module is a power station core power generation device, the modular fuel supply system serves as a fuel supply system for the distributed cell stack module, and the modular oxidant supply system serves as an oxidant supply system for the distributed cell stack module; the modular cooling system performs cooling and heat exchange of the distributed cell stack module, the power transmission and inverter system converts, transmits and allocates a power of the distributed cell stack module, and the power station master system controls and manages each of the systems and the modules. The process system is unattended during peak electricity consumption.