Please see linked image explaining the idea.
The smoke is "clean" smoke from a well burning fire,
so
should be mostly CO2 replacing the oxygen).
The smoke is sent with a series of chimneys outside
the balloon and along its face. This heats the walls
so
steam does not condensate.
Water
vapor is evaporated by boiling it from a pot
under the balloon and above the coal.
The balloon is made of material that can withstand
80C, and the bottom is covered with lightweight
aluminium bubble wrap, so that the smoke and
steam
do not damage the parts they come in contact with.
The people in the basket are extended below this
whole contraption. The basket can be built in the
shape of a bagel for safety, so that the fire and
boiling
water can drop without hurting the people in the
basket.
Of course a fire extinguisher will be available for any
emergency, and the water will be immediately
evaporated by releasing it into the fire.
A safety roof can be installed above the basket as
well.
Before addressing any other minor problems I wish
to
remind you that this is halfbakery, so not everything
in this idea was fully thought through. You are
encouraged to take a Can-Do approach and help
solve
the challenges you see with this idea.