HEAT- AND MASS-TRANSFER APPARATUS Russian patent published in 1997 - IPC

FIELD: heat- and mass-transfer apparatuses. SUBSTANCE: the offered apparatus has detachable and comprised of separate interconnected sections, heat-exchange tube accommodating coaxial detachable scraper shaft located on centralizers and provided with supporting members with movable in radial direction spring-loaded strip scrapers, whose working surfaces facing internal surface of heat-exchange tube. Novelty in heat- and mass-transfer apparatus consists in centralizers made in form of strip scrapers and limiters of their radial motion uniformly spaced over scraper shaft. In this case, strip scrapers of adjacent sections of heat-exchange tube are displaced in axial direction with partial overlapping to form stepped combined scraper surfaces inside the detachable heat-exchange tube covering it over its entire length. Besides, limiters of radial motion of strip scrapers may be made in form of, either, projections on sides of strip scrapers facing the scraper shaft, or in form of projections on shaft located under strip scrapers, or in form of screw or auger blades uniformly spaced over shaft with radial slots in which strip scrapers are movably located with radial gap relative to ends of blades in slots. Radial gap between strip scrapers limiters of this radial motion is, preferably, not in excess of 0.03(Ri-Ro), where Ri is inner radius of heat-exchange tube, Ro is outer radius of scraper shaft. EFFECT: higher efficiency. 6 cl, 7 dwg