A complex flow-path
heat exchanger having U-shaped tube and
cantilever combined coil, which can achieve, in this type
heat exchanger, a simple construction, a complex flow of steam within the same one heat exchange shell body, a
high heat exchange efficiency, and a low
energy loss. The technical gift of the present invention is that, after entering into the
heat exchanger, steam firstly
effects heat exchange on the U-shaped tube flow path shell side to be cooled and condensed, thereafter entering into flow path tube side of the
cantilever combined coil, which are disposed within the same one shell, for a secondary heat exchange, and subsequently flowing out of the heat exchanger after being subcooled. Such steam-water heat exchanger having a complex flow path are advantageous in a small steam flow resistance of the U-shaped tube flow path shell side; a higher condensate
water flow velocity in the
cantilever combined coils flow path tube; a
high heat exchange coefficient; good coordination of the
temperature difference fields of the hot and cold fluids in the heat exchanger; and a
high heat exchange efficiency. Therefore, the present heat exchanger can be a new generation product relative to the currently-used conventional low-temperature, low-pressure and
corrosion-free heat exchangers.