An aircraft includes a fuel cell-powered electric engine system configured to power the aircraft and produce water vapor exhaust, and an exhaust system configured to receive the water vapor exhaust, condense the water vapor into ice or water, and expel the ice or water from the aircraft such that water vapor cloud formation is inhibited. A method of powering an aircraft includes operating a fuel cell-powered electric engine system to power the aircraft, condensing water vapor exhaust of the fuel cell-powered electric engine system into ice or water, and expelling the ice or water from the aircraft such that water vapor cloud formation is inhibited.

A concentration reducing apparatus for a fuel cell vehicle includes: a body having an inner flow path through which an exhaust gas containing a target fluid flows in a predetermined discharge direction, in which the body is made of a porous material that allows a selective discharge of the target fluid in order to selectively discharge the target fluid to an outside of the body.

The invention relates to a method for removing water from a fuel cell system (1) comprising a fuel cell stack (2) having an anode portion (3) and a cathode portion (4), a purge valve (5) downstream of the anode portion (3) for controlling a purge pressure in the anode portion (3), and a back pressure valve (6) downstream of the cathode portion (4) for controlling a back pressure in the cathode portion (4), comprising the steps: increasing the purge pressure in the anode portion (3) to a predefined purge pressure setpoint (AP1) with the purge valve (5) closed, increasing the back pressure in the cathode portion (4) to a predefined back pressure setpoint (KP1) with the back pressure valve (6) closed, and subsequently reducing the increased purge pressure as well as the increased back pressure in pulses by opening the purge valve (5) and the back pressure valve (6). Furthermore, the invention relates to a fuel cell system (1) and a computer program product (10) for carrying out a method according to the invention, as well as a storage means comprising a computer program product (10) stored thereon.

The present disclosure generally relates to systems and methods for using a relative humidity sensor in a cathode exhaust stream of a fuel cell stack to optimize the performance and efficiency of the fuel cell stack.

A fuel cell system includes a controller that controls actions of the fuel cell system. The controller includes a freezing presence-absence determination unit that performs freezing presence-absence determination, a temperature raising execution unit that performs temperature raising processing for raising a temperature of an exhaust and drain valve, and a thawing presence-absence determination unit. In the freezing presence-absence determination, freezing determination is made when the exhaust flow rate of gas is equal to or lower than a first threshold. In the thawing presence-absence determination, thawing determination indicating that the exhaust and drain valve is thawed is made when the exhaust flow rate of gas is higher than a second threshold. The second threshold shows a flow rate higher than the first threshold.

The present disclosure generally relates to monitoring and controlling emissions produced by a fuel cell or fuel cell stack in a fuel cell engine of a vehicle and/or powertrain.

A propulsion system including: a fuel cell assembly having a fuel cell defining an outlet positioned to remove output products from the fuel cell and a fuel cell assembly operating condition; a turbomachine comprising a compressor section, a combustion section, and a turbine section arranged in serial flow order, the combustion section configured to receive a flow of aviation fuel from an aircraft fuel supply and further configured to receive the output products from the fuel cell; and a controller comprising memory and one or more processors, the memory storing instructions that when executed by the one or more processors cause the propulsion system to perform operations including receiving data indicative of a mid-flight flameout within the combustion section; modifying the fuel cell assembly operating condition in response to receiving data indicative of the mid-flight flameout within the combustion section; and initiating a relight of the combustion section.

A fuel cell system anode tail gas oxidizer (ATO) includes an inner ATO wall, an outer ATO wall, and a first catalyst ring disposed in a chamber formed between the inner ATO wall and the outer ATO wall. The first catalyst ring includes an inner wall, an outer wall, and a matrix disposed between the inner wall and the outer wall and loaded with an oxidation catalyst.

A high-pressure gas cylinder valve for vehicle includes a valve seat having a gas charging runner and a gas supplying runner. A check valve is connected in series onto the gas charging runner, and the check valve and a solenoid valve are connected in series sequentially onto the gas supplying runner in a gas flow direction. A portion of the gas supplying runner located downstream of the solenoid valve is jointly connected to a portion of the gas charging runner adjacent to a gas inlet end and supplies gas to outside through a gas inlet of the gas charging runner when the gas supplying runner supplies gas. The gas cylinder valve further includes a flow-blocking buffer structure connected in series onto the gas supplying runner and located downstream of the solenoid valve and upstream of an intersection of the gas supplying runner and the gas charging runner.

The present disclosure relates to a fuel cell system including a discharge line configured to discharge exhaust gas, which is discharged from a fuel cell stack, to the outside, and a pneumatic branch line having an outlet end connected to the discharge line, and an inlet end connected to a pneumatic supply unit configured to supply air to a pneumatic part of a mobility vehicle, the pneumatic branch line being configured to selectively supply the air from the pneumatic supply unit to the discharge line, thereby effectively reducing a hydrogen concentration in the exhaust gas discharged from the fuel cell stack.