(57) Process and apparatus for indirectly cooling a hot gas that contains impurities which,
on cooling, deposit in the form of water-soluble solids, the hot gas being passed
through a heat exchanger provided with tubes. A water film flows downwards along each
of the tubes, and the water flowing away from beneath the tubes is discharged from
the heat exchanger. Preferably use is made of a substantially vertical heat exchanger
in which the gas is passed through the tubes and the water for the water film is fed
onto a substantially horizontal tube plate in the top of the heat exchanger, to which
tube plate the tubes are connected such that their ends project somewhat above the
tube plate.
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