(FR2664746-A)      Electrical generating plant comprises H2/O2 fuel cell; a liq. cpd. endothermic reaction H2 source. liq. H203 supply: a reformer for liberating H2 gas from the source; a decomposer for providing 02 from the H202; a heat supply for the reformer; and means for supplying the H2 and 02 to the cell.    The heat supply system includes a heat-exchanger arranged upstream of the reformer so as to impart up to 80% of the required heat to the cpd. before it reaches the reformer. The remaining heat is supplied to the reformer, pref. via an electrical heater. The heat for the heat-exchanger is (partly) supplied by the exothermic reaction in the decomposer.    USE/ADVANTAGE -   Esp. in a submarine. System provides optimum weight, space and chemical efficiency.    (DE3537527-A)      Electrical generating plant comprises H2/O2 fuel cell; a liq. cpd. endothermic reaction H2 source, liq. H2O3 supply; a reformer for liberating H2 gas from the source; a decomposer for providing O2 from the H2O2; a heat supply for the reformer; and means for supplying the H2 and O2 to the cell.    The heat supply system includes a heat-exchanger arranged upstream of the reformer so as to impart up to 80% of the required heat to the cpd. before it reaches the reformer. The remaining heat is supplied to the reformer, pref. via an electrical heater. The heat for the heat-exchanger is (partly) supplied by the exothermic reaction in the decomposer.    USE/ADVANTAGE -   Esp. in a submarine. System provides optimum weight, space and chemical efficiency.    (US5141823-A)      Electrial generating plant comprises (a) fuel cell requiring supply of gaseous hydrogen and oxygen; (b) first supply device to supply, to the plant, H2 contg. cpd. which is liq. at NTP; (c) second supply device selectively operable, to supply liq. H2O2 and then air; (d) reformer connected to frist supply device, in which H2 contg. cpd. liberates gaseous H2. Appts. also comprises (e) decomposer selectively connected to second supply device, to decomposte H2O2 exothermically, to liberate O2; (f) means to transmit given off heat to the H2 contg. cpd.; (g) means to supply heat to H2 contg. cpd.; (h) means to supply gaseous H2 to fuel cell; and (i) means to suppy gaseous oxygen and air to fuel cell in second mode of operation.    USE/ADVANTAGE -   For obtaining electrical output. Used esp. in a submarine. Plant operates thermally self sufficiently.    (DE3537527-C2)      Electrical generating plant comprises H2/O2 fuel cell; a liq cpd. endothermic reaction H2 source. liq H2O3 supply; a reformer for liberating H2 gas from the source; a decomposer for providing O2 from the H2O2; a heat supply for the reformer; and means for supplying the H2 and O2 to the cell.    The heat supply system includes a heat-exchanger arranged upstream of the reformer so as to impart up to 80% of the required heat to the cpd before it reaches the reformer. The remaining heat is supplied to the reformer, pref. via an electrical heater. The heat for the heat-exchanger is (partly) supplied by the exothermic reaction in the decomposer.    USE/ADVANTAGE -   Esp. in a submarine. System provides optimum weight, space and chemical efficiency.