Ocean-chill drying of microalgae and microalgal products

Details Ocean-chill drying of microalgae and microalgal products Ocean-chill drying of microalgae and microalgal products

1992-10-13

1994-01-11

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 57A, 159 402, 159 41, F26B 308

Patent

active

052769771

ABSTRACT:
This is a method and apparatus for drying microalgae/microalgal products which have been harvested and strained of excess water by a spray drying process. The method comprises, obtaining drying gas from a burner in which metered input air for combustion is mixed with fuel at or before a dryer gas heating burner and which does not require oxygen in the drying gas that is heated; using the drying gas to dry the microalgae/microalgal products in a spray dryer; separating dryed microalgae/microalgal products from moist drying gas in a cyclone; scrubbing and dehumidifying the moist drying gas; recycling the scrubbed and dehumidified drying gas to the dryer gas heating burner; and, venting a portion of the drying gas equivalent in volume to combustion gases generated in the burner. Scrubbing and dehumidifying is accomplished by spraying the moist drying gas with sea water at a temperature below 60.degree. F. Also, the method includes recovering carbon dioxide from vented drying gas by directly contacting the vented drying gas with algal culture media.

REFERENCES:
patent: 3100693 (1963-08-01), Klein et al.
patent: 4171243 (1979-10-01), Brooks et al.
patent: 4473438 (1984-09-01), Loureiro
patent: 5223088 (1993-06-01), Hansen

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