SMALL-SIZED CYLINDRICAL STEAM GENERATOR AND PRINCIPLE OF ITS OPERATION Russian patent published in 1994 - IPC

FIELD: power engineering. SUBSTANCE: each steam generating element of steam generator is made in form of two ferrules mounted coaxially: outer ferrule 1 and inner ferrule 2. Inner ferrule 2 forms gas duct. Each steam generating element is provided with spiral insert 4 located between ferrules and forming helical passage for medium being heated. Relationship of diameters of ferrules 1 and 2 is equal to 1.05 to 1.6 and relationship of areas of cross sections of gas ducts and passage is equal to 2 to 200. Steam generating elements are located coaxially in a spaced relation to each other. Gas ducts of peripheral steam generating elements are connected to each other and to gas duct of axial steam generating element in series. Ducts for passage of medium being heated are brought in communication. Mass velocity on gas ducts is maintained within 20 to 200 kg/sq. m/s. Flow of medium being heated is set in reciprocating motion and its mass velocity is maintained within 300 to 3000 kg/sq. m/s. EFFECT: enhanced efficiency. 3 cl, 3 dwg