摘要:
The invention relates to a process for operating a system for the water vapor reforming of a hydrocarbon, having an evaporator, a reforming reactor, a membrane module connected behind, and a catalytic burner device. According to the invention, a first part of the catalytic burner device is in thermal contact with the reforming reactor, and a second part of the burner device is in thermal contact with the evaporator. According to the process, a heating operation is carried out during the cold start of the system, in which, in a first operating phase, at least the evaporator and the reforming reactor are heated by the catalytic burner device, and in a second operating phase, a hydrocarbon/water vapor mixture is prepared in the evaporator at a water/hydrocarbon ratio which is higher than in the normal operation and is fed to the reactor, the substance mixture emerging from the reactor being fed by way of the membrane module to the catalytic burner device.
摘要:
A membrane for separating hydrogen from a gas mixture is provided on at least one side with a catalyst layer for a specific catalytic combustion process. A methanol reformation system so equipped can be brought rapidly to operating temperature, with the hydrogen-separating membrane being heated directly by performing the catalytic combustion process.
摘要:
A system for the water vapor reforming of a hydrocarbon includes an evaporator, a prereforming unit, a main reformer, a CO removal unit and at least one catalytic burner unit. A first burner unit is in a thermal contact with the evaporator and a second burner unit is in a thermal contact with the main reformer, and the prereforming unit is in a thermal contact with the CO removal unit by way of one heat conducting separating medium. In addition, the outlet of the CO removal unit is connected with the inlet of the at least one burner unit. During a cold start, a heating-up operation is carried out during which first the two burner units are activated with an external feeding of hydrogen or hydrocarbon, and the reforming operation is started with a hydrocarbon fraction that is lower than in the normal operation. The resulting reformate gas, instead of the externally fed hydrogen or hydrocarbon, is introduced as fuel into the burner units.
摘要:
A system for the water vapor reforming of a hydrocarbon includes a modular reactor unit of the plate stack and/or tube bundle type that, in an integrated manner, contains an evaporator, a prereforming unit, a main reformer, a CO removal unit and a catalytic burner unit. The evaporator and the main reformer are in a thermal contact with the catalytic burner unit and, the prereforming unit is in a thermal contact with the CO removal unit.
摘要:
The invention relates to a process for operating a system for the water vapor reforming of a hydrocarbon. The system includes a reactor which is suitable for POX operation as well as for a reforming operation, an evaporator, a hydrogen separating stage, and a catalytic burner device. A first part of the catalytic burner device is in thermal contact with the reforming reactor, and a second part of the burner device is in thermal contact with the evaporator. An air/hydrocarbon intermediate feeding pipe for the reactor and a pressure maintaining valve are provided for changing the reactor between the POX operation and the reforming operation. According to the process, during cold start of the system, a heating operation is carried out during which the reactor is first used in the POX operation at a lower pressure and subsequently is used for the reforming operation and simultaneously the pressure is increased to the normal operating pressure. The invention is particularly useful for the water vapor reforming of methanol for obtaining hydrogen for a fuel-cell-operated motor vehicle.
摘要:
A fuel cell system has at least one fuel cell and a hydrogen generating arrangement for feeding the fuel cell anode with a hydrogen-containing product gas from a conversion reaction of a hydrocarbon starting substance or hydrocarbon derivative with of water fed supplied by way of a water feeding system. Water recovery devices are provided for condensing water out of the process gas supplied by the hydrogen generating arrangement, and/or out of the cathode waste gas carried away from the fuel cell cathode, and returning the condensed-out water into the water feeding system.
摘要:
A reforming reactor system for water vapor reforming of methanol in fuel-cell operated motor vehicles has a reactor unit with a catalyst-filled reaction space and a particle filter which is arranged in a reformate gas pipe downstream of the reactor unit. The catalyst material is carried in the reaction space by a sieve below which a metallic nonwoven for catching sieved-out fragments and dust particles of the catalyst fill is situated. The particle filter contains a spun steel wool netting and/or several filter steps serially connected behind one another. The particle filter may be arranged to be exchangeable without interrupting the operation of the system. Specifically, a particle filter which has a filter body which can be changed in a gas-tight manner transversely to the gas flow and/or a cyclone filter can be used which has a closing device for the purpose of an emptying of a particle collecting pot which does not interrupt the operation.
摘要:
In a reforming reactor suitable particularly for the water vapor reforming of methanol in mobile applications such as vehicles, a reaction space is filled with a catalyst pellet fill and has a movable reaction space wall which exerts a position-fixing pressure onto the catalyst pellet fill. According to the invention, a filling device is provided through which catalyst material can be filled from the outside into the reaction space through a passage opening formed in one of the reaction space walls.
摘要:
A reforming reactor, particularly for the water vapor reforming of methanol, with three serially arranged reactor steps, each of which is charged with a catalyst pellet fill. According to the invention, the center reactor step is maintained at a temperature which is suitable for the reforming reaction, while the two other reactor steps remain unheated. The present invention may be used as a reforming reactor for the water vapor reforming of methanol for the purpose of producing hydrogen in a fuel-cell operated motor vehicle.
摘要:
A reforming reactor system, suitable in particular for water vapor reforming of methanol, has a reforming reactor in which a reforming catalyst material is situated. A drop catching element is assigned to the inlet side of the reforming reactor, in order to catch drops which may be contained in the gas/vapor mixture, and thus prevent their damaging contact with the catalyst material.