HRS Process Technology Inc., a heat transfer specialist for the process industries in Glendale, Ariz., has supplied a U.S. manufacturer of processed meat and poultry ingredients with a Unicus hygienic scraped-surface heat exchanger for an expansion of the company's concentrated chicken broth plant.
The unit is used to sterilize
up to 10 gal/min of concentrated chicken broth by heating it to 270°F (132°C)
with superheated steam at 305°F (150°C). Because the broth contains 32 percent
solids with significant protein content, heating to 270°F (132°C) presented an
fouling problem for conventional heat exchangers. In such exchangers, a layer
of burned-on product would rapidly build on the tube wall, requiring frequent
cleaning, according to HRS.
The Unicus design includes
hydraulically activated scraper elements inside the inner tube of a
shell-and-tube heat exchanger. The elements continuously clean the tube surface
to maintain good thermal transfer. Also, the reciprocating action of the
scraper elements introduces turbulence, increasing thermal transfer efficiency.
The scraped-surface design
allows the process to run for very long periods without downtime. Also, because
the reciprocating action is slow and the product tends to lubricate it, wear
and resulting consumption of spare parts is minimal, HRS says.
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