Moisture recovery and humidification in a fuel cell system involving (i)
intermittently switching each dryer in a plurality of dryers into and out of one
of a first mode of operation for recovering moisture from an outgoing oxidant stream
and a second mode of operation for humidifying an incoming oxidant stream such
that during use at least one dryer is in the first mode of operation and at least
one dryer is in the second mode of operation; (ii) directing the outgoing oxidant
stream from the cathode through at least one dryer in the first mode of operation
to recover moisture from the outgoing oxidant stream; and (iii) directing the incoming
oxidant stream through at least one dryer in the second mode of operation to humidify
the incoming oxidant stream with moisture.
