Heat exchanger

The utility model relates to a heat exchanger, including casing, head an and head b, the casing is both ends confined cylinder structure, the inside parallel rivers layer of multilayer that is equipped with of this casing, the rivers layer is the open box body structure in both ends, is this rivers layer outside 10mm with shells inner wall's clearance 15mm, space between the adjacent rivers layeris gas current layer, is this gas current layer's height 10mm 15mm, sealing connection is link up with casing both ends respectively in rivers layer both ends, the welding is equipped with chimb an onthe diameter line of casing one end, head an is connected to casing one end, and head b is connected to its other end, head b inner weld is equipped with the chimb b who corresponds with chimb a, head b upper portion is equipped with the delivery port, and its lower part is equipped with the water inlet, casing one end top is equipped with the air inlet, and this casing other end top is equippedwith the blow -down pipe, a