NOVELTY - The thermoelectric generator comprises a thermoelectric module (13) assembled with a calogenic reactor having a porous body (3) and a pipe (2) for the input of fuel from a reservoir (1). The reaction of exothermic oxidation of fuel takes place in the porous body (3) by an oxidation agent which is ambient air (4) taken in through a duct (5) by the action of a propeller (7) of a fan driven by electromotor (8) and directed through openings (9) in the porous body. The gas from the reaction is evacuated through an opening (11) and is ejected through an opening (12).    USE - In thermoelectric generators, for obtaining electricity on the basis of heat of chemical reactions such as the oxidation of fuel; in energy conversion.    ADVANTAGE - The generator can function in different positions and its functioning is not affected by air currents, shaking or acceleration. The external temperature is acceptable to allow for safe handling. The generator releases only carbon dioxide and a small quantity of water.    DETAILED DESCRIPTION - The fuel reservoir (1) is in the form of a replaceable cartridge, and the fuel is a hydrocarbn such as gas butane, and/or alcohol, and/or another combustible. The porous body (3) is an agglomerat, spongy, granular, fibrous textile, stone, ceramic, porcelain, platinum foam, porous metal or a porous metallic alloy such as porous bronze. The chemical reaction is strongly exothermic, and the fuel which is liquid and/or gas is input under pressure. The heat in the porous body vaporizes or gasifies the fuel. The hot face (10) of the thermoelectric module is against the reactor, and the cold face (14) dissipates the heat by radiation and/or convection and/or conduction. The reactor is of cylindrical configuration, and the thermoelectric module is tubular surrounding the reactor. In the second embodiment, the generator comprises an additional reservoir for absorbing the humidity of exhaust gas, which is also in the form of a replaceable cartridge containing an absorber, which is integrated with the fuel reservoir.    DESCRIPTION OF DRAWING(S) - The drawing is combined of two cross-sectional views of the generator: vertical and horizontal.    Fuel reservoir (1)    Pipe for fuel (2)    Porous body (3)    Ambient air (4)    Duct for air input (5)    Chamber wall (6)    Propeller of fan (7)    Electromotor (8)    Openings for passage of air (9)    Hot face, cylindrical envelope (10)    Openings for output gas (11,12)    Thermoelectric module (13)    Cold face (14)    Surface of pipe (6)    Insulation pieces (17,18)    Electric ground (19)    Contact pad (20)    Chamber cover (21)    Electric insulation (22)    Support piece (23)    Watertight joint (24)