FILM-TYPE EVAPORATOR Russian patent published in 2003 - IPC

FIELD: film-type evaporators used for performing heat exchange processes; food-processing, chemical, oil refining, metallurgical and other industries. SUBSTANCE: proposed film-type evaporator includes cylindrical housing, upper and lower end plates, upper and lower tube sheets, heat exchange tubes, film formers, inlet and outlet pipe unions for heating steam, condensate, vapor and liquid being treated which are mounted in upper plate together with pipe line made in form of coil connected with pipe union introducing liquid being treated; rectilinear section is secured between tube sheets; each heat exchange tube is rigidly fitted in active radiating packing and is located coaxially relative to axis of each ultrasonic transducer having central through hole at diameter equal to inner diameter of heat exchange tube and length equal to (nλ); lower and upper tube sheets lie in zones of minimum antinode, where n=(k+1), k-0,1,2,3 ; λ- is length of ultrasonic wave. Besides that, each film former of film-type evaporator is made in form of tube located in upper portion of end plate; it is rigidly fitted in active radiating packing coaxially relative to each ultrasonic transducer having central through hole at diameter equal inner diameter of film former tube and total length equal to (kλ), where k= 0, 1,2,3,..; λ- is length of ultrasonic wave. Length of film former together with active radiating packing may be equal to (k+1/4)λ, where k= 1,2,3 ; λ- is length of ultrasonic wave; helical grooves may be provided on outer and inner surfaces of heat exchange tubes and film formers; acoustic geometric sizes of film formers are at least half of said sizes of heat exchange tubes and length of wave is equal to where λ₁ is length of ultrasonic wave of heat exchange tube; λ₂- of length of ultrasonic wave of film former. Each heat exchange tube of evaporator may be provided with bush made in form of separator with holes where rotating balls are secured; said separators are located coaxially relative to heat exchange tubes and are rigidly secured in them in zones of maximum antinode of oscillations. Besides that, bush-separator is rigidly fitted at end face of each heat exchange tube and rectilinear section of pipe line in upper portion of end plate; bush has holes where balls are secured for rotation. EFFECT: extended functional capabilities; enhanced efficiency; improved quality of liquids. 7 cl, 5 dwg