摘要:
Hydrogen generation and fuel cell operation are integrated through the use of a fuel processor or hydrogen generation zone which comprises a pre-reforming zone, a partial oxidation zone, a reforming zone, a water gas shift zone and a preferential oxidation zone. According to the present invention, an oxygen-enriched stream is provided to the fuel processor and to the fuel cell from the adsorption effluent withdrawn from an adsorption zone. The oxygen-enriched stream is depleted in nitrogen which improved the efficiency of the fuel processor and the fuel cell by reducing nitrogen dilution. A further advantage resulted in fuel processor/fuel cell systems which burn the anode waste gas in a combustion zone to provide heat to the fuel processor zone. By diluting the anode waste gas with an oxygen-reduced gas, it is possible to maintain the combustion temperature in the convection range and reduce or eliminate the amount of excess air employed in the combustion zone
摘要:
A fuel reformer suited for mounting on a vehicle is provided. A raw material gas containing methanol and water is vaporized at a vaporization section 30. The vaporized gas flows horizontally to a reforming section 60 with monolithic catalyst 70. The reforming section is divided into two sides, a front side 62 and a rear side 64, with an interconnecting pipe 66 bent at 180 degrees, for connecting the front and rear sides. By making the material gas flow horizontally, even when the reformer is mounted to a vehicle which has a larger space in its horizontal direction than in its vertical direction, especially a small passenger car, the contact time period between gas and catalyst can be extended. By bending the reforming section by 180 degrees, the size of the reformer can be reduced so that the reformer is suited for mounting on a vehicle having limited space. Because the vaporization section 30 and the CO reducing section 80 can be placed adjacent to each other, by using heat generated at the CO reducing section, the heat loss during pre-heating of the methanol and water can be reduced.
摘要:
A system and method of operating a pre-reformer in a gas-to-liquids plant at minimum steam/carbon levels in order to reduce the C2null content is provided that allows for the efficient production of synthesis gas to be used in producing liquid hydrocarbons preferably through a Fischer-Tropsch synthesis. The process and system involves providing steam, natural gas having greater than 3 percent C2null, and possibly hydrogen to a pre-reformer and converting a significant amount of the C2null to methane and CO2 and then using a synthesis gas generator to prepare a synthesis gas feedstock with about a 2:1 H2:CO ratio and without undue soot formation. The synthesis gas is used in a Fischer-Tropsch synthesis unit to convert the synthesis gas to the heavier hydrocarbons. Water, light hydrocarbons, and portions of the tail gas may be recycled in different embodiments.
摘要:
Fuel processors and fuel processing and fuel cell systems containing the same. The fuel processor is adapted to produce a product hydrogen stream from a feed stream, such as at least one of water and a carbon-containing feedstock, which may be one or more hydrocarbons or alcohols. In some embodiments, the fuel processor is a steam reformer containing a separation region in which the reformate stream is purified using a pressure-driven separation process. In some embodiments, the fuel processor includes a filter assembly adapted to remove particulates from the reformate stream prior to delivery to the separation region. In some embodiments, the fuel processor contains one or more cartridge-based components to facilitate easier removal and replacement of these components. In some embodiments, the fuel processor includes an air delivery system adapted to regulate the operating temperature of the fuel processor.
摘要:
A process for the production of synthesis gas for obtaining compounds such as ammonia or methanol, in which hydrocarbons and steam are reacted first in a primary reforming section (11) and then—together with oxygen—in a secondary reforming section (12), thus obtaining CO, CO2, H2 and possibly N2 which are then fed to a carbon monoxide conversion section (13, 14), is distinguished by the fact of reacting hydrocarbons, steam and oxygen in an autothermal reforming section (20) provided in parallel with respect to other reforming sections (11, 12), and feeding the so produced CO, CO2, H2 and possibly N2 to the carbon monoxide conversion section (13, 14).
摘要:
Hydrocarbon feedstocks are converted into synthesis gas in a two-stage process comprising an initial steam reforming step followed by final conversion to synthesis gas in a mixed conducting membrane reactor. The steam reforming step converts a portion of the methane into synthesis gas and converts essentially all of the hydrocarbons heavier than methane into methane, hydrogen, and carbon oxides. The steam reforming step produces an intermediate feed stream containing methane, hydrogen, carbon oxides, and steam which can be processed without operating problems in a mixed conducting membrane reactor. The steam reforming and mixed conducting membrane reactors can be heat-integrated for maximum operating efficiency and produce synthesis gas with compositions suitable for a variety of final products. Synthesis gas produced by the methods of the invention is further reacted to yield liquid hydrocarbon or oxygenated organic liquid products.
摘要:
A process for ammonia and methanol co-production in a plant comprising a first primary reforming section (11) and a secondary reforming section (12) arranged in series, an ammonia synthesis section (13) and a methanol synthesis section (22), is distinguished by the fact that ammonia and methanol are produced in independent synthesis processes where the heat required for the reforming reaction in the methanol process is advantageously obtained by utilizing the high heat content present in the gas flow coming from the secondary reforming section (12) of the ammonia process.
摘要:
A reactor comprises at least one burner, to which hydrocar-bonaceous gas and gas rich in 0.sub.2 are supplied. The hydrocar-bonaceous gas is supplied to the burner through a transfer line at temperatures of 100 to 1300.degree. C. and a pressure in the range from 10 to 70 bar. Adjacent the orifice end of the transfer line, which is connected with the burner, there is provided a screen-like perforated wall through which the hy-drocarbonaceous gas can flow. This wall ensures a uniform gas flow in the burner, and at the same time it prevents solid matter from a certain size onwards from penetrating into the sensitive portion of the burner and settling there.
摘要:
At least during some part-load operation of a gas turbine wherein a fuel gas is combusted with air with the formation of a flame and the combustion products are let down through a turbine, the fuel gas comprises the product of a stage of catalytic autothermal steam reforming of a light hydrocarbon feedstock gas and the amount of air fed to the gas turbine combuster, relative to the amount of hydrocarbon fed to the catalytic autothermal steam reforming stage, is greater than the maximum amount of air that enables a flame to be sustained in said combustor if that amount of hydrocarbon were to be fed directly to the combustor.
摘要:
A PSA based process for the production of technical hydrogen wherein the feed to the PSA contains nitrogen and carbon monoxide with a hydrogen/(carbon monoxide+nitrogen) volume ratio in the range 1.2 to 4 and a nitrogen/carbon monoxide volume ratio of at least 10. The adsorption step in the PSA stage is stopped when the integrated nitrogen content of the unadsorbed product is 1 to 10% volume.The raw gas fed to the PSA is preferably made by primary reforming a hydrocarbon feedstock with steam followed by secondary reforming followed by shift and water removal: the heat required for primary reforming is preferably supplied by the secondary reformer outlet gas.The PSA waste gas is preferably combusted in a gas turbine driving the secondary reformer air compressor.