Heat exchange comprising cleaning means

A heat exchanger comprising:

• an enclosure provided with a plurality of tubes in which a heat-transfer fluid circulates, said fluid conveying cleaning balls;
• feed and outlet collectors joined to the enclosure via a first and a second side wall of the enclosure opposite each other, respectively, in order to bring the heat-transfer fluid into the enclosure and to discharge said heat-transfer fluid coming from the enclosure respectively, the outlet collector being produced as one part in the form of a single piece having a first portion forming a flow converger and a second portion forming a nozzle that is joined to said flow converger, this outlet collector having a downstream mouth via which it is joined to a heat-transfer fluid discharge pipe;
• and
• a separation device placed in the second portion of the outlet collector in order to separate the cleaning balls from the fluid conveying them, which device comprises at least two pairs of grids placed near the downstream mouth and each mounted so as to rotate on a spindle that extends across said second portion, the spindles for the grids being pairwise parallel to one another, this separation device forming a filtering structure that converges on a recovery device placed in said second portion so as to recover the cleaning balls leaving the separation device.