초록 ▼

A solid-oxide fuel cell system having an integrated air supply system, including a central air pump, distribution manifold, air control valves, mass air flow sensors, and supply ducts, for controllably supplying oxygen for the fuel cell reaction, both through and controllably bypassing cathode air h

A solid-oxide fuel cell system having an integrated air supply system, including a central air pump, distribution manifold, air control valves, mass air flow sensors, and supply ducts, for controllably supplying oxygen for the fuel cell reaction, both through and controllably bypassing cathode air heat exchangers; combustion air for a combustor of tail gas from the anodes; cooling air for electronic controls; and reforming air to a liquid fuel vaporizer integral with a hydrocarbon fuel reformer.

대표청구항 ▼

A solid-oxide fuel cell system having an integrated air supply system, including a central air pump, distribution manifold, air control valves, mass air flow sensors, and supply ducts, for controllably supplying oxygen for the fuel cell reaction, both through and controllably bypassing cathode air h

A solid-oxide fuel cell system having an integrated air supply system, including a central air pump, distribution manifold, air control valves, mass air flow sensors, and supply ducts, for controllably supplying oxygen for the fuel cell reaction, both through and controllably bypassing cathode air heat exchangers; combustion air for a combustor of tail gas from the anodes; cooling air for electronic controls; and reforming air to a liquid fuel vaporizer integral with a hydrocarbon fuel reformer. c is a plasma arc. 7. The welding process according to claim 1, in which a gas chosen from argon, helium, nitrogen or a mixture thereof is used as assist gas for the laser beam and/or a gas chosen from argon, helium or a mixture thereof, optionally with additions of one or more secondary compounds chosen from nitrogen, hydrogen and carbon dioxide, is used as plasma gas. 8. The welding process according to claim 1, in which, during at least part of a welding stop time elapsing between an end of welding one welded joint and a start of welding a next welded joint, an electric arc current is interrupted, attenuated or reduced. 9. A process for welding at least two metal workpieces to be assembled by using at least one laser beam and at least one electric arc to produce at least one weld bead, said electric arc being struck between at least one electrode and the at least one workpiece to be welded, the electrode being connected to a first pole of at least a first current source and connected to a second pole of the at least first current source, at least one electrically conducting earth contactor in contact with said workpieces to be welded, wherein at least a first contact is made between at least a first earth contactor and one of the workpieces to be welded laterally and/or upstream of a point of impingement of the electric arc on the workpieces to be welded, considering a direction of formation of a welded joint, and at least a second contact is made between at least a second earth contactor and the other workpiece to be welded laterally and/or upstream of the point of impingement of the electric arc on the workpieces to be welded, considering a direction of formation of the welded joint, said first and second contacts being symmetrical with respect to a longitudinal axis of the weld bead produced at the junction of said workpieces, and the first and second earth contactors being electrically isolated from one another. 10. A process for welding one or more metal workpieces to be welded or to be assembled by using at least one laser beam and at least one electric arc to produce at least one weld bead, said electric arc being struck between at least one electrode and the at least one workpiece to be welded, the electrode being connected to a first pole of at least a first current source and connected to a second pole of the at least first current source, at least one electrically conducting earth contactor in contact with said workpiece to be welded, wherein the shape and/or flow of current lines are/is controlled in the workpiece(s) to be welded between a point of impingement of the electric arc on said workpiece(s) and at least two electrically conducting earth contactors in contact with said workpiece to be welded, so as to balance forces associated with an induced electromagnetic field which act on a puddle of liquid metal obtained by melting edges of said workpiece(s) to be assembled and constituting, after cooling and solidifying, a welded joint, when said current lines pass through said puddle of liquid metal, said two earth contactors being electrically isolated from one another. 11. A hybrid arc/laser welding unit for welding one or more metal workpieces to be welded or assembled, comprising: at least one laser beam generator; at least one electrode for generating at least one electric arc; at least a first current source comprising at least a first pole to which said electrode is connected; and at least one electrically conducting earth contactor designed to come into contact with at least one workpiece to be welded, said earth contactor being connected to at least a second pole of the at least first current source, a point of contact between said earth contactor and the workpiece(s) to be welded being located laterally and/or upstream of a point of impingement of the electric arc on the workpiece(s) to be welded, considering a direction of formation of a welded joint, and further comprising at least two earth co