The present invention discloses an atmospheric-pressure tower oil gas heat exchanger and a heat exchange method which comprises a heat exchanger housing (11), an upper tube plate (16), a lower tube plate (17) and a heat exchange pipe (5) A tube side inlet (13) is provided at the bottom of the housing, a tube side outlet (18) is installed at the top of the housing (11) A shell side inlet for connecting the atmospheric pressure tower oil gas pipeline 2 is provided at the upper portion of the housing 11, a shell side outlet is provided at the lower side of the housing 11, and a main coil pipe 6 is provided at the upper portion inside the housing And a plurality of water holes (61) communicating with the inside of the housing are installed on the main coil pipe (6); The atmospheric pressure tower oil gas piping 2 is connected to the external main piping 3 through the first main piping 31 and the third main piping 33; A first solenoid valve 34 and a second solenoid valve 35 are provided on the first main water pipe 31 and the third main water pipe 33. The main coil pipe 6 is connected to the second main water pipe 32, And is connected to the external main water pipe (3) through the pipe (3). In the heat exchanger according to the present invention, the first and second main water are continuously injected into the shell side at a predetermined ratio, and the third main water is intermittently injected into the shell side at a large flow rate to clean the stain in the shell side, Thereby preventing clogging and corrosion.;
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