METHOD AND SYSTEM FOR DESULFURIZING GASOLINE OR DIESEL FUEL FOR USE IN A FUEL CELL POWER PLANT

摘要

A fuel processing system is operative to remove substantially all of the sulfur present in a logistic fuel stock supply (4). The fuel stock can be gasoline, diesel fuel, or other like fuels which contain relatively high levels of organic sulfur compounds such as mercaptans, sulfides, disulfides, and the like. The system is a part of a fuel cell power plant (2). The fuel stock supply is fed through a reformer (10) where the fuel is converted to a hydrogen rich fuel which contains hydrogen sulfide. The hydrogen sulfide-containing reformer exhaust is passed through a sulfur scrubber (14), to which is added a small quantity of air, which scrubber removes substantially all of the sulfur in the exhaust stream by means of the Claus reaction. The desulfurizing step causes sulfur to deposit on the scrubber bed, which after a period of time, will prevent further sulfur from being removed from the reformer exhaust stream. The sulfur scrubber station is rejuvenated by passing a gas stream (32) containing a relatively small amount (about 1% by volume) of carbon monoxide. The carbon monoxide is converted to carbonyl sulfide which is then bummed in power plant bummer so as to form sulfur dioxide in the power plant exhaust stream.