Heat exchange apparatus

A heat exchange apparatus which is composed of a plurality of tube banks arranged in rows, each of said tube banks comprising a plurality of tubes arranged in a direction normal to an exhaust gas flow in a gas passage duct, and in which an interval of a first space between adjacent tube banks in the gas flow direction is less than eight times of a depth of a tube bank disposed on an upstream side with respect to the exhaust gas flow, and baffle plates are disposed parallel to said gas flow direction in each of the respective tube banks by dividing the duct width so as to prevent multibank tubing compound resonance, each of the baffle plates disposed in an upstream side tube bank having an extension extending into said first space from a center of a most downstream side tube in the upstream side tube bank and having a length more than two times of a tube pitch in the gas flow direction, and each of the baffle plates disposed in an adjacent downstream side tube bank having an extension extending into said first space from a center of a most upstream side tube in the downstream side tube bank and having a length more than two times of a tube pitch in the gas flow direction, wherein a maximum extension into said first space of the baffle plate extensions of the upstream side tube bank does not contact or overlap a maximum extension into said first space of the baffle plate extensions of the adjacent downstream side tube bank, and a second space within said first space is defined between end portions of the baffle plate extensions of the upstream side tube bank and end portions of the baffle plate extensions of the adjacent downstream side tube bank.