GAS-GAS HEAT-EXCHANGER Russian patent published in 2015 - IPC F28D7/16 

FIELD: power industry.

SUBSTANCE: heat-exchanger, in particular, for use in contact group of sulphuric acid unit contains a chamber (2), in which the tubes bundle (12) is arranged along the ring, at that between the tubes bundle (12) and enclosing casing (13) of the chamber a gas space (15) is arranged, gas supply hole (6) is made in the chamber casing (13), and is intended for gas exhaust mainly in radial direction relatively to the tubes bundle (12), and gas exhaust hole adjacent to the internal space (16) enclosed by the tubes bundle (12) mainly in axial direction. The uniform approach flow in the tubes bundle (12) is provided due to that centre (ZR) of the tubes bundle (12) is displaced relatively the centre (ZK) of the chamber casing (13) in direction from the gas supply hole (6).

EFFECT: assurance of uniform heat supply, prevention of temperature decreasing below condensation point of the sulphuric acid.

9 cl, 2 dwg