TUBULAR HEAT EXCHANGER COMPRISING GRAPHITE TUBES, INCLUDING A FOULING CONTROL MEMBER, METHOD FOR USING SAME AND ASSEMBLY METHOD THEREOF
The invention relates to a heat exchanger comprising: a chamber (3, 4, 16); a plurality of graphite tubes (2) disposed in the chamber, each tube having a peripheral wall; inlet means through which phosphoric acid can enter the tubes; outlet tubes through which phosphoric acid can leave the tubes; inlet means through which a second fluid can enter the chamber; and outlet means through which a second fluid can leave the chamber. The exchanger is characterised in that at least one graphite tube (2) is equipped with at least one member (5) for controlling the fouling on its peripheral wall, said control member comprising: a body (51) disposed on the external face (2') of said wall; an electrical resistor (52) extending in the body (51); and measurement means (53) for measuring the temperature of the electrical resistor (52).