Here is an excel file I made (15 kb) for computing the power required for continuous stripping
http://www.stainlessstuff.net/up/contin ... ations.xls
here is the content :
Code: Select all
Power calculations for continuous stripper
water etoh
specif heat vapo 2246000 841000 J/kg
heating 4100 2460 J/k/kg
abv % mass %
out 40 34,46920052 boiling temp for output 96 C
in 10 8,060067423
ethanol density kg/l 0,789
wash input rate 25 l/hour
input wash temp 20 C
spent wash flow rate 18,75 l/hour 6150000 J/hour
output flow rate 6,25 l/hour
mass flow rate for output etoh 1,699762451 kg/hour 317787,5878 J/hour
mass flow rate for output water 4,095674967 kg/hour 1276212,32 J/hour
total 1593999,908 J/hour
Evaporation: etoh 1429500,221 J/hour
water 9198885,976 J/hour
total 10628386,2 J/hour
grand total 18372386,11 J/hour
power required 5103,440585 watts
2) some very interesting points :
-if the output abv can be raised from 40 to 50 % abv the power required drops from 5103 Watts to 4300 W (or a bit less considering the boiling point lowers too)
-by using a wash preheater to heat the wash from 20 to 50 C, the power required drops from 5103 Watts to 4288 W
- with 50% abv and a wash preheater, the power required drops from 5103 Watts to 3490 W
it's so good i would not be surprised if I made a mistake