摘要:
The invention relates to an energy generation unit comprising at least one high-temperature fuel cell, which is preceded by a reformer for preprocessing the fuel for the high-temperature fuel cell, having an outgoing line at the cathode side, which transfers thermal energy to the reformer. The reformer is placed in a preferably cylindrical combustion chamber of a flame burner, which flame burner is activated during the start-up phase of the energy generation unit, and the combustion chamber of the flame burner is connected to the outgoing line at the cathode side of the high-temperature fuel cell in order to subject the reformer to cathode exhaust gas from the fuel cell.
摘要:
In a method for improving cold starting of a catalytically active component in gas generation systems for a mobile fuel cell system, a temporary store is arranged directly in the starting-material gas stream. During cold starting, the temporary store stores gaseous constituents from the gaseous starting material, which constituents cause problems when starting, and releases such constituents (which have been stored during the cold-start phase) again as a result of the heating which takes place as operation of the system continues.
摘要:
In a process for operating a fuel cell system with a water balance, a hydrogen-containing medium or a mixture of mediums is reformed in a reforming reactor with a water requirement, by adding water to a hydrogen rich reformate. The reformate is fed to an anode region of a fuel cell and reacts with oxygen from a cathode region of the fuel cell, forming water in the fuel cell. The the water required for the reforming reaction and/or the water balance of the fuel cell system is coupled directly to the oxidation rate of the partial combustion of the hydrogen-containing medium or the mixture of mediums in an oxidizing unit upstream of the reforming reactor.
摘要:
A method for the operation of a methanol reforming apparatus wherein, during the operation of the reforming reaction, methanol is reformed in a methanol reforming reactor using a methanol reforming catalyst. The reforming reaction is interrupted at given times for catalyst reactivation phases, during which the reactor containing the methanol reforming catalyst is flushed with hydrogen gas for the activity-regenerating treatment of the methanol reforming catalyst which loses its catalytic activity. The process may be used for the operation of methanol reforming apparatus in fuel-cell-operated motor vehicles for the production of hydrogen from liquid methanol.
摘要:
A motor vehicle has an electrochemical cell, which includes an electrode stack of at least two electrodes in a parallel arrangement. The electrochemical cell is arranged outside an engine compartment of the motor vehicle in an accommodation compartment of the motor vehicle, the cross-sectional surface of which is tapered in the direction of the vertical axis of the vehicle. A cross-sectional surface of the electrochemical cell is thereby adapted to the cross-sectional surface of the accommodation compartment. Thus, particularly good use is made of the available space in the motor vehicle.
摘要:
The invention relates to a device for determining at least one parameter of at least one medium, said medium being introducible into at least one measuring path. An electric and/or electromagnetic field can be partially coupled into or out of the medium by passing at least one electric and/or electromagnetic signal into the measuring path. The measuring path comprises at least one line arrangement having at least two elementary cells arranged along the measuring path, said elementary cells comprising at least one electric path from at least one input to at least one output and comprising at least one respective capacitative element. The electrical properties of the capacitative element can by be modified by the medium. The electric and/or the electromagnetic signal can be applied to the input of a first elementary cell and the output of the first elementary cell can be connected to the input of a second elementary cell. The capacitative element of the respective elementary cell is arranged in the electric path of the first and second elementary cell. At least one inductive element connects the first elementary cell and the second elementary cell to a ground. The invention also relates to a method for determining a parameter of a medium.
摘要:
A system for heating and/or converting at least one medium, such as an evaporator, a reactor or a heat exchanger, has layers arranged in a stack which layers are formed by pressing catalyst material. Devices are provided for dividing the stack into a number of separate function areas.
摘要:
A device feeds educts to parallel spaces separated from one another by way of a distributor unit. Outlets of the distributor unit are assigned to the spaces, and evaporator structures for the evaporation of liquid media are provided in the spaces. Each outlet of the distributor unit project into a space. The boiling point of the medium in the distributor unit is maintained above the temperature of the medium in the distributor unit.
摘要:
A device for evaporating liquids includes a porous, thermally conductive evaporation body, which contains a catalyst material on one surface, while the evaporation body is gas-impermeable on the opposite surface. Liquid which is to be evaporated and, if appropriate an additional fuel, can be fed to the evaporation body. The heat of evaporation required is provided by an exothermic reaction of the liquid or with a gaseous oxidizing agent at the catalyst material.
摘要:
An apparatus for producing hydrogen from hydrocarbons or alcohol, particularly methanol, by feeding a reaction mixture comprising a hydrocarbon or alcohol and water onto a catalyst. The catalyst is formed by compressing at least one catalyst powder into a compressed layer to form a shaped body. The reaction mixture flows under pressure through the catalyst layer while the pressure drops. Furthermore, the apparatus is suitable for a use in a hydrogen shift phases for reducing carbon monoxide, in carbon monoxide oxidizers and catalytic burners. A process for producing the catalyst is also disclosed.