Abstract: The distribution-pressurized natural gas is supplied via a conduit arranged in the piston of an electrovalve in a nozzle of which the outlet leads to a cone which provides, with the nozzle, a ring-shaped opening which, connected to the atmosphere, acts as a secondary nozzle for injecting air into the gas flow. The cone is followed by a cylindrical element then by an abrupt widening section which opens into a heat exchanger which is in contact with a substrate impregnated with a catalytic material which oxidizes fuel gas. A small amount of air is sucked up by the widening and mixed with the gas. This mixture is then treated in the exchanger up to the transformation temperature of the sulphur-containing compound and the sulphur is then oxidized.

Abstract: A catalysis heating apparatus includes a catalytic combustion cell and a reflector made of two semi-circular sections which form the seat for a partition. Spacers create a gap between the combustion cell and the reflector and also accommodate an annular nozzle placed at one end of a channel. The partition center holds a ventilator which feeds air to said channel, while an electromagnetic valve controls the input of gas to the combustion cell. The assembly is held together by a section which comprises a grooved ring with an annular slot opening onto the inside, its two ends being fixed by rivets. A filtering compartment and a top are mounted on said grooved ring.