While perusing the web site for Fox Valve (venturi ejectors, etc.) I happened
across a page regarding evaporative cooling used in freeze drying. The page
states that "evaporative cooling is accomplished by pulling a vacuum on
moisture-enriched products within a vessel. An increase in vacuum results in
a lowering of the boiling point of the moisture, causing rapid evaporation.
During evaporation, the latent heat is given up - thereby reducing the
temperature of the product." The page further states that "a typical
multi-stage eductor unit can cool from 200°F to 35°F in 15 - 20 min."
Does anyone know whether 1) the material must first be heated for the process
to be efficient, and 2) once cool, is the material also mostly dry? If
vacuum cooling/drying is practical in the food processing industry, I'm
wondering if it could also be practical for use in biomass drying? Does
anyone have knowledge or experience with the use of vacuum drying of biomass?
This particular Fox Valve web page address is:
http://www.foxvalve.com/frameset-steam.html
Any feedback would be appreciated!
Regards,
Vernon Harris
The Gasification List is sponsored by
USDOE BioPower Program http://www.eren.doe.gov/biopower/
and PRM Energy Systems http://www.prmenergy.com
Other Sponsors, Archives and Information
http://www.crest.org/renewables/gasification-list-archivehttp://solstice.crest.org/renewables/biomass-info/gasref.shtmlhttp://www.crest.org/renewables/biomass-info/http://www.crest.org/renewables/biomass-info/carbon.shtml
