Heat exchanger cleaning system and heat exchanger cleaning method

A heat exchanger cleaning method using a heat exchanger cleaning system, which includes:

• a target rotor that rotates around a virtual rotation axis extending in one direction;
• a first inlet positioned above the target rotor, through which first gas is introduced toward the target rotor;
• a first outlet positioned below the target rotor and opposed to the first inlet, through which the first gas passing through the target rotor is discharged;
• a second inlet positioned below the target rotor and spaced apart from the first outlet, through which second gas having a temperature lower than that of the first gas is introduced toward the target rotor;
• and
• a second outlet positioned above the target rotor and opposed to the second inlet, through which the second gas passing through the target rotor is discharged,
• the method comprising:
• positioning a first soot blower in an inner space of the first inlet;
• injecting a first material through the first nozzle of the first soot blower and, simultaneously, injecting a second material through the second nozzle of the first soot blower, which is positioned at a predetermined interval from the first nozzle, toward the target rotor during rotation of the target rotor;
• and
• removing foreign substances since the first material and the second material sequentially reach one point of the target rotor,
• wherein a first distance of the first nozzle spaced apart from the virtual rotation axis of the target rotor is substantially the same as a second distance of the second nozzle spaced apart from the virtual rotation axis of the target rotor.