NOVELTY - Removing sulfur from a gaseous fuel flow involves: passing gaseous fuel flow over at least one dual layer bed, with at least one dual layer comprising a desulfurizing portion and a pyrophoric portion; determining time to regenerate desulfurizing portion; passing an air flow first over a substantial portion of pyrophoric portion, and then over desulfurizing portion, such that airflow is heated by pyrophoric portion, and heated airflow removes sulfur form desulfurizing portion to produce sulfurous air flow; exhausting sulfurous air flow; and purging the dual layer bed of the airflow.    USE - For removing sulfur from a gaseous fuel flow (claimed), useful for a fuel cell.    ADVANTAGE - The method and apparatus provide regenerable method and apparatus that can remove low levels of sulfur from a gaseous fuel flow. The regenerable two layer desulfurizer is capable of removing even small amounts of sulfur that can ruin sensitive catalysts and stop fuel reforming, from a gaseous fuel flow. The dual layer bed and the double layer system comprise first layer of regenerable sulfur absorber that adsorbs sulfur, and a second layer is a pyrophoric material. The fuel flow is passed over first layer composed of a regenerable sulfur adsorbing material that absorbs the sulfur, and then over second layer of a pyrophoric material that uses some amount of heat in flowing gas for a chemical reduction to store as potential energy. For restoring sulfur adsorbing capacity of the adsorbent i.e. for desulfurizing; air is passed first over the pyrophoric material to heat, which releases the potential energy and heats the air flow. The heated air is then blown backwards through the desulfurizer, which provides the energy for releasing physically adsorbed sulfur compounds from the adsorbing surfaces, removes the sulfur from the sulfur absorber, and regenerates it; as compared to the prior art sulfur removers generally require replacement and disposal of the adsorbing bed layer after it is spent, or when they are designed for in situ regeneration, an external source of regenerating heat, such as steam is needed. When the system is in normal operation, the fuel stream reduces the pyrophoric material, and in turn regenerates it. Thus, the method and apparatus can eliminate the need for external equipment to remove and replace the spent bed, or eliminate the external regeneration equipment and also the energy needed to supply heat. In addition, also save the time taken to replace or regenerate sulfur removers of the prior art sulfur removers. By using the fully regenerable two layer desulfurizer; removal of most or all the sulfur from the gaseous flow is possible, with few and limited down times.    DETAILED DESCRIPTION - Removing sulfur from a gaseous fuel flow involves: (a) passing a gaseous fuel flow over at least one dual layer bed, with the at least one dual layer comprising a desulfurizing portion and a pyrophoric portion, in which the desulfurizing portion removes sulfur from the gaseous fuel flow, and the pyrophoric portion stores a portion of energy from the gaseous fuel flow; (b) determining a time to regenerate the desulfurizing portion of the at least one dual layer bed; (c) passing an air flow first over a substantial portion of the pyrophoric portion of the at least one dual layer bed, and then over the desulfurizing portion, such that the airflow is heated by the pyrophoric portion, and the heated airflow removes sulfur form the desulfurizing portion to produce a sulfurous air flow; (d) exhausting the sulfurous air flow; and (e) purging the at least one dual layer bed of the airflow. An INDEPENDENT CLAIM is included for a regenerable sulfur remover comprising: a gaseous flow (preferably a fuel); a first layer comprising a physical absorber of sulfur in line with the gaseous flow; a second layer comprising a pyrophoric material that can be reduced by the gaseous flow in line with the first layer; a blower that blows air first over the second layer, such that the air flow is heated by passing over the second layer, and then over the first layer, so that the heated airflow removes sulfur from the first layer, and is exhausted after removing sulfur from the first layer; and a purge that clears the first layer and the second layer of the air flow.    DESCRIPTION OF DRAWING(S) - The figure shows removing sulfur from a gaseous fuel flow with the regeneration air blowing in an opposite direction to the fuel flow.    fuel (2)    dual layer bed (4)    desulfurizing layer (6)    pyrophoric layer (8)    standard operating valves (12, 14)    regenerating valves (16, 18)    purge valve (20)    blower. (22)