Falling film evaporator

Details Falling film evaporator Falling film evaporator

1982-03-25

1984-01-03

Sever, Frank

Concentrating evaporators

Miscellaneous

159 13R, 159 49, 202173, 202236, 203 89, B01D 122

Patent

active

044240988

ABSTRACT:
An energy efficient falling film evaporator having a plurality of substantially vertical and equidistant heat exchange elements made of a synthetic polymeric material. Each evaporating surface is in contact with a liquid spreading means, and each heat exchange element is heated by steam having a condensation temperature slightly higher than the boiling point of the aqueous solution from which water is being evaporated. Steam formed by evaporation of water either is recompressed and reintroduced as heating steam in a single-stage process or is used as heating steam for another stage, operating at a lower temperature and pressure, in a multistage process. Heating steam condenses to fresh water, which is recovered. This process is operated at a lower temperature and pressure, in a multistage apparatus. Heating steam condenses to fresh water, which is recovered. This evaporator is operated at a low feed rate, preferably below 45 kg of incoming aqueous solution per linear meter of horizontal width of each evaporating surface, and is capable of providing a 50% fresh water recovery per pass from sea water. Higher recoveries are possible in the case of brackish waters and various industrial waters. The evaporator is useful in water desalination and purification.

REFERENCES:
patent: 3227630 (1966-01-01), Beckman
patent: 3757856 (1973-09-01), Kun
patent: 3977364 (1976-08-01), Wilhelmus et al.

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