BÜCHI
Mini Spray Dryer
B-290
Quick Operation Guide
Switch
Aspirator on
Set Inlet temperature,
Switch Heater on
Open
compressed air
Distilled water ready,
start peristaltic pump
Reduce inlet
temp. and/or
increase
pump rate
Increase inlet
temp. and/or
reduce
pump rate
Adjust Nozzle
cleaning
Change from distilled
water to product
Change from product
to distilled water
Inlet Temp. reached
Spray Drying in process
Outlet Temp.
too high
Wet glass
product sticking
Generates the gas stream in the system. 100% re-
commended, so efficient drying and best separation
is obtained.
For aqueous solutions, inlet temperatures are between
100 and 220°C. Lower range for heat sensitive product.
Typical set point 150°C.
By opening the needle valve on the flow control, the
compressed air for the feed dispersion is set. Typical
level is 4 cm (approx. 600 l/h).
Close peristaltic pump bed. The process is started
with pure water to get the drying conditions . The outlet
temp. will decrease due to the consumption of energy
by the evaporation.
Typical set point of pump 30%.
The outlet temp. defines the maximal thermal load for
the product. Adjust inlet temp. and pump rate to obtain
a certain outlet temp. Lowering the aspirator rate will
also decrease the outlet temp.
In case of suspensions or product which tend to clog
the nozzle, the nozzle cleaning is switched on. Higher
number (2-9) means more cleaning pushes.
The spray drying starts as soon as the tube is switched
from pure water to product (by feed switch valve or
manually). The outlet temp. will slightly increase becau-
se less water has to be evaporated, eventually adjust
inlet temp.
Switch back to pure water to clean tube and nozzle.
Additional cleaning effect by drawing air bubbles.
