FIRE TUBE OF HEAT-TRANSFER APPARATUS Russian patent published in 2003 - IPC

FIELD: thermal engineering; steam and water boilers. SUBSTANCE: fire tube is furnished with swirl generator arranged within its interior over its entire length and made in the form of heat-resistant wire spiral locked in axial position. Inner surface of tube carries meander grooves along spiral directed in opposition to swirl generator spiral. Groove profile is shaped as circular connection of two forward rays spaced maximum 90 deg. apart to ensure smooth flow of coolant and opposing resistance in groove. EFFECT: enhanced thermal characteristics of plant, reduced heat and power requirement. 2 cl, 2 dwg