FIELD: heat- power engineering; hot-water boilers and water preheaters; protection of heat-transfer surfaces against scale. SUBSTANCE: intermediate member transmitting ultrasonic oscillations is mounted on hot-water boiler or water preheater between waveguide of transducer and heat-transfer surface of hot-water boiler or water preheater coaxially relative to longitudinal axis; its longitudinal axis is set an angle of 30 to 60 deg. relative to longitudinal axis of heat-transfer surfaces of tubes, shields, risers and convective tube bundles. Such method ensures effective descaling of tubes over their entire length due to transmitting oscillations at angle. EFFECT: enhanced efficiency. 1 dwg
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