A system comprises on the one hand a spiral plate exchanger coiled around a principal axis of the exchanger, in particular oriented vertically, so as to delimit a first fluid flow channel having a cross section in the shape of a spiral discharging at a first axial extremity of the exchanger at an inlet zone of which the overall size is contained within a crown, and on the other hand a distribution device configured in order to supply in a homogeneous manner the whole of the surface of the said crown with at least a first fluid, in particular a liquid.
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