EVAPORATOR Russian patent published in 1999 - IPC

FIELD: wood-pulp and paper, alumina and chemical branches of industry, in particular, evaporation of water from industrial solutions. SUBSTANCE: the evaporator has a heating chamber with vertical boiling tubes flared out in the upper and lower tube plates, secondary vapor separator located over the heating chamber, lower solution chamber located under the heating chamber, and a set of cylindrical film-forming inserts furnished with external multichannel arrangements and installed in each boiling tube. The inserts are located over and under the upper tube plate; the external spiral arrangements are positioned below the upper tube plate, and part of the length of the cylindrical film-forming inserts located under the upper tube plate is determined by formula [meters]. The external spiral arrangements of each film-forming insert have a pressure loss not exceeding the length of the upper end of the insert. EFFECT: enhanced stability of operation due to continuous discharge of secondary vapor from the boiling tubes. 2 cl, 2 dwg