(US5169730-A)      Electrochemical arrangement has a fresh fuel gas inlet (28), an oxidant gas inlet (30), a spent fuel recirculation channel (46), a separate exhaust gas channel (45), a generation chamber (22) contg. fuel cells (16), a combustion chamber (24) and a reforming chamber (54). The spent fuel recirculation channel (46), part of which contacts the outside of a mixer chamber (52), passes from the generator chamber to combine with the fresh fuel inlet at the mixer chamber inlet, where a mixer nozzle (50) is provided, its exit communicating with the reforming chamber.    ADVANTAGE -   C deposition is eliminated, high-temp. seals are not required.    (JP2965272-B2)      An electrochemical apparatus comprises a fresh gaseous feed fuel inlet; a gaseous feed oxidant inlet; a hot gaseous spent fuel recirculation channel; a separate combusted exhaust gas exit channel; a generator chamber containing a plurality of electrochemical cells, each cell having an exterior fuel electrode and an interior air electrode; a combustion chamber; a reforming chamber containing a reforming material. The hot spent fuel channel, a portion of which is in contact with the outside of a mixer chamber, passes from the generator chamber to combine with the fresh feed fuel inlet at the entrance to the mixer chamber, and a mixer nozzle is located at the entrance to the mixer chamber, where the mixer chamber exit connects with the reforming chamber and reformed fuel entry ports connect the reforming chamber to the generator chamber, and where the mixer chamber and mixer nozzle are exterior to the main body of the apparatus and substantially spaced apart from the --combustion chamber and the generator chamber. Pref. the electrochemical cells are fuel cells, the fresh gaseous feed fuel is natural gas, the air electrode contains doped LaMnO3, the electrolyte is yttria stabilized zirconia and the fuel electrode contains a zirconia nickel cermet material.    USE/ADVANTAGE -   Electrochemical apparatus containing a plurality of electrochemical cells each having an exterior fuel electrode, which can be contacted by a gaseous fuel mixture of fresh feed and recirculated spent fuel. Mixing of the gases is at an ejector exterior to the body of the apparatus, with gaseous fuel temps. not exceeding 400 deg.C. Carbon deposition is therefore eliminated.