still designed to meet to USP specification
of water for injection, meantime acording
to water quality differ from feed water and
different number of effects, the distillate
resistivity quality easy to obtain and the
distillate temperature id over 80°C to
avoid bacteria growing. The feed water at
least is better than Deionized Water (DIW).
Exchanger / According FDA
contacting feed-water part all using
SUS 316L stainless steel 320-340# grit
tube sheet design, free from cooling
water contamination into distillations
by glass fiber.
support and flanges by SUS 304.
running all piping passivation process.
equipment is take advantage of heat exchanger
working principle, just first column is heated
by an extermal steam, other column is from
the first column pure steam used for heating
the next column, use evaporator and condenser
to force the proceed two phase variation,
detailed describing as following.
First, let evaporator inside feed water pass
through heat exchanger change from liquid
to vapor, use its latent heat into separator.
In the separator inside is equip with special
mist damper and high centrifugal force cyclone
dervice. The vapor will passing through 180
degree continuous rotation, by means of above
mentioned special dervice to separate particles,
drops and pyrogenic, and so on the vapor of
leaving separator is not contains solution
solid and pyrogenic, it is sterile and pryogenation
free. These particles and drops will return
to the evaporator column low part to hearting
again, here just high speed purified vapor
can pass through the separator enter condenser.
Then to processed second phase variation,
let condenser inside vapor pass through cooling
exchanger change from vapor to liquid (distillate),
and use diverter valve to assure the distilled
water quality, if the water quality is below
purity set, it will exhaust to drain piping,
otherwise it will flow to storage tank to
provide with the pharmaceutical purpose of
water for injection.
Moreover, due to this still is adopt multiple
effect type and via first condenser to preheat
the feed water before entering each column,
meanwhile every column the evaporation inside
feed water latent heat piping device is equip
with recovery, to consumption of the steam