HEAT EXCHANGER Russian patent published in 1994 - IPC

FIELD: chemical industry. SUBSTANCE: tube sheets of heat exchanger are provided with floating head 3 whose center portion 5 is shifted from axis of bundle relative to peripheral portion 6. Both portion of the tube sheet are interconnected by means of cylindrical shell 7. Depending on the temperature of medium in the central and peripheral bundles of tubes, central portion 5 of tube sheet of floating head is shifted either towards fixed tube sheet 4 or to opposite side. All components of floating head 3 are made of the material whose coefficient of linear expansion is lesser than that of the material of tubes; inner header in form of cylindrical chamber 9 is located in the outer header formed by cover 8 for axial displacement. During operation of the heat exchanger, difference between linear temperature elongations of the central and peripheral tubes is compensated for by displacement of portions 5 and 6 of the tube sheet relative to each other. EFFECT: enhanced reliability. 3 cl, 2 dwg