SUPPORTING STRUCTURE FOR HEAT EXCHANGER

摘要

An annular heat exchanger (2) provided with a high temperature fluid passage inlet (11) at one end in the axial direction and a low temperature fluid passage inlet (15) at the other end in the axial direction is supported inside a cylindrical outer casing (9) via a heat exchanger supporting ring (36). The heat exchanger supporting ring (36) connecting a low temperature section near the low temperature fluid passage inlet (15) of the heat exchanger (2) and a posterior flange (33) of the outer casing (9) is formed by bending a sheet in a cross-sectionally step shape so that it can readily undergo elastic deformation to offset the thermal expansion of the heat exchanger (2). This ensures positive sealing between the high temperature fluid passage inlet (11) and the low temperature fluid passage inlet (15) of the heat exchanger (2) while minimizing the thermal stress occurring in the heat exchanger (2) and the outer casing (9). The heat exchanger supporting ring (36) also has a function of partitioning between a combustion gas passage inlet (11) and an air passage inlet (15).