摘要:
Method and apparatus for steam reforming a sulfur-containing hydrocarbon fuel, such as a diesel hydrocarbon fuel. The apparatus includes a desulphurization unit, a pre-reformer, and a steam reforming unit. A carbon dioxide fixing material is present in the steam reforming catalyst bed to fix carbon dioxide that is produced by the reforming reaction. The carbon dioxide fixing material is an alkaline earth oxide, a doped alkaline earth oxide or a mixture thereof. The fixing of carbon dioxide within the steam reforming catalyst bed creates an equilibrium shift in the steam reforming reaction to produce more hydrogen and less carbon monoxide. Carbon dioxide fixed in the catalyst bed can be released by heating the carbon dioxide fixing material or catalyst bed to a temperature in excess of the steam reforming temperature. Fuel processors having multiple catalyst beds and methods and apparatus for generating electricity utilizing such fuel processors in conjunction with a fuel cell are also disclosed.
摘要:
A combustor for oxidizing a combustion fuel and pre-heating one or more reactants for fuel reforming. The combustor includes an elongated housing having an inlet for receiving a combustion fuel and an outlet for exhausting combustion products. The elongated housing further includes a cylindrical side wall, a bottom wall, and a top wall. Inert particles are disposed within the housing adjacent the inlet. A combustion catalyst bed is disposed within the housing above the inert particles that is a mixture of inert particles and combustion catalyst. The inert particles and the combustion catalyst preferably have a volumetric ratio of inert particles to catalyst between about 2:1 and about 4:1. The combustor has at least one heat exchanger within the combustion catalyst bed for heating a reformer reactant and generating steam. Preferably, the combustor includes at least two heat exchangers within the combustion catalyst bed, the heat exchanging elements have different surface areas. The combustor can include at least one sensor for measuring temperature within the combustor, and preferably the reactor includes two or more sensors for measuring temperature at two or more locations within the combustion catalyst bed. A power-generating apparatus comprising the combustor, a fuel processor and fuel cell is also provided. Methods for pre-heating a reactant and generating steam for use in a fuel reformer and for manufacturing a combustor for use in fuel reforming are provided.
摘要:
A compact fuel processing reactor. The reactor includes a housing having an inlet for receiving a process gas and an outlet for a directing a product gas out of the housing. A catalyst bed that includes discrete particles of a refractory material is located within the housing for contacting the process gas. A coiled tubing heat exchanger is at least partially disposed within the catalyst bed for cooling the catalyst bed. The coiled tubing can comprise a smooth continuous outer surface in intimate contact with the discrete particles. The circulating cooling medium comprises water in liquid, gas or a mixture of liquid and gas phases. The discrete particles in the catalyst bed are in intimate contact with at least a portion of the coiled tubing to promote heat transfer from the catalyst bed to the coiled tubing. The heat exchanger has less than about 25, preferably less than about 20, more preferably less than about 15, and still more preferably less than about 10 square meters of heat exchanging surface area per cubic meter of catalyst bed. The catalyst bed can be a water gas shift, desulfurization or reforming bed. The reactor can include one or more additional catalyst beds arranged in series such that the housing enclosed a shift catalyst bed as well as a desulphurization bed and/or a reforming bed. Methods of cooling a catalyst bed within a compact reactor and methods of manufacturing a compact reactor are also provided.
摘要:
A portable fuel processing apparatus and enclosure including an enclosure having an outer wall that defines an interior space and provides a gas impermeable barrier. Attached to the enclosure is porting means for use in moving the enclosure from one location to another. A fuel reformer capable of providing sufficient hydrogen-rich reformate to a fuel cell stack for use in generating at least about 1 kW per hour is disposed within the enclosure. An optional gas detection system includes a sensor disposed within the enclosure to monitor the interior of the enclosure for presence of combustible gases. The portable apparatus can have a number of connectors for connecting the enclosure and the fuel processing systems to a source of a reformer fuel and water as well as a domestic drain. Preferred sources of fuel and water are common utility lines available in buildings. Additional connectors can be provided to couple the fuel processor with a fuel cell, for used in delivering a reformate stream, air stream and circulating cooling medium to a fuel cell and for returning a fuel cell exhaust stream to the enclosure. Moreover, the portable fuel processing apparatus and enclosure can further include connectors for establishing electronic communications with a remote process control unit. A method of installing the portable fuel processing apparatus is also provided.