CLIMBING-FILM EVAPORATOR Russian patent published in 2000 - IPC

FIELD: climbing-film evaporators for concentration of solutions which are not prone to high temperatures in liquid aggregation state; evaporation of liquors of mineral fertilizers or production of distillate in chemical, petrochemical and other industries. SUBSTANCE: climbing-film evaporator includes tubular heat exchanger with upper and lower tube sheets, heating tubes and pipe unions for inlet of heating steam and outlet of condensate and inert agents. Arranged concentrically inside heating tubes are central tubes of lesser diameters having holes. Pitch "t" of holes reduces by constant value downward. Central tubes are additionally provided with multi-stage film-forming checker over entire height made in form of stepped bushes with diameters of steps increasing upward over internal and external surface. Bushes are mounted above holes of central tubes and are provided with slotted cuts to half of their height. EFFECT: modification of construction; high concentration of finished product; increased productivity by evaporated moisture. 3 dwg