摘要:
The use of polyarylene sulfides or liquid-crystalline polyesters is described in cooling devices for electrical equipment. The use of these polymers can ensure that the electrical conductivity of insulating coolant fluids remains low in continuous operation. Fuel cells are particularly suitable electrical equipment.
摘要:
In a fuel cell assembly, a passive gas spring is disposed between the stack and the supporting structure for maintaining compressive force on the stack and manifold seal. As variation in temperature of the assembly and structure causes dimensional changes therein, the pressure within the gas spring also changes accordingly. The gas spring is provided with inlet and outlet check valves, the outlet check valve opening to expel air when internal spring pressure reaches a predetermined upper pressure limit, and the inlet check valve opening to admit air when the internal spring pressure falls below a predetermined lower pressure limit in a currently preferred embodiment, the outlet check valve allows exit of gas from the gas spring at pressures exceeding 5 psig, to prevent rupture of the gas spring, and the inlet check valve allows entrance of gas into the gas spring as the spring cools following use.
摘要:
An electrochemical power generation system includes a fuel cell stack having an oxidant delivery system, an oxygen sensor for measuring the oxygen concentration of ambient air in the vicinity of the power generation system, and a hydrogen concentration sensor for measuring a hydrogen concentration in the ambient air in the vicinity of the power generation system. A controller is configured to cease operation of the power generation system, for example ceasing delivery of fuel to the fuel cell stack, when either the hydrogen concentration measured by the hydrogen concentration sensor exceeding a hydrogen concentration threshold or the oxygen concentration measured by the oxygen sensor falling below an oxygen concentration threshold.
摘要:
A method for operating a direct methanol fuel cell is provided. The fuel cell includes a fuel cell main body having a fuel electrode and an air electrode disposed in opposing positions on either side of an electrolyte film. In this method, an aqueous methanol solution is supplied directly to the fuel electrode. A quantity of the aqueous methanol solution supplied is controlled in accordance with an electric current value drawn from the fuel cell main body so as to minimize a quantity of unused methanol within a discharge fluid discharged from the fuel electrode.
摘要:
A heat exchanger design is provided for optimal transfer of thermal energy between a primary reactor-out reformate and a primary reactor-in steam and air. In particular, one embodiment of the present invention comprises a prime-surface true counterflow heat exchanger positioned around the primary reactor. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that is will not be used to interpret or limit the scope or meaning of the claims.
摘要:
A method and system (10) are provided for humidifying a cathode inlet gas flow (18) in a fuel cell system (12) including a fuel cell (14) and a compressor (16) for supplying the cathode inlet gas flow (18) to a cathode side (20) of the fuel cell (14). According to the method and system (10) heat is transferred from the cathode inlet gas flow (18) to a cathode exhaust flow (24) at a first flow location with respect to the cathode inlet gas flow (18), and water vapor is transferred from the cathode exhaust flow (24) to the cathode inlet gas flow (18) at a downstream flow location from the first flow location with respect to the cathode inlet gas flow (18).
摘要:
The present invention relates to a process and an apparatus for the deionization of a cooling medium of a fuel cell circulating in a cooling circuit. According to the invention, a liquid deionizing agent is allowed to act at least intermittently on the cooling medium so that the deionizing agent can take up ions from the cooling medium. For this purpose, the fuel cell apparatus (10) of the present invention, which comprises at least one fuel cell (11) and at least one cooling circuit (20) for the fuel cell, has at least one deionization apparatus (23) in which a liquid deionizing agent can act on the cooling medium in the cooling circuit (20). The deionization apparatus can comprise static mixers (28, 34) downstream of which membrane separators (29, 35) are installed.
摘要:
A technique that is usable with a fuel cell system includes using the fuel cell system to provide power to a load. The technique includes providing a model that indicates a future power demand from the load and regulating an operation of the fuel cell system in response to the future power demand that is indicated by the model.
摘要:
A device used for air supply of a fuel cell has an expander and a compressor that is at least partially driven thereby. The hot gases of combustion at least occasionally flow through the expander. After flowing through the expander, the exhaust gases emit at least a portion of the residual thermal energy remaining in them to at least one of the fuel flows supplied for combustion and during a cold start especially also to the cooling circuit of the fuel cell. A device of this type may be used, for example, in a mobile fuel cell system.
摘要:
Auxiliary fuel cell system that provides backup power to a primary power source, and energy-consuming systems that are otherwise associated with at least one primary power source and at least one auxiliary fuel cell system. The auxiliary fuel cell system includes at least one fuel cell stack that is adapted to produce an electric current from a fuel and an oxidant, such as from hydrogen and oxygen gases. The auxiliary fuel cell system further includes a source of fuel, such as a source of hydrogen gas, and this source may include a fuel processor that is adapted to produce the hydrogen gas or other fuel. The energy-consuming system is adapted to selectively draw an electric current from a primary power source or an auxiliary fuel cell system. A Source selection system selectively establishes electrical communications between an energy-consuming system and the primary power source or the auxiliary fuel cell system.