Evaporation Rates

Evaporators

Hugot 33.26 pg 571 gives guide line values for specific evaporation rates for a quadruple effect evaporator

Operating between 200 kPa a and 14 kPa a
Effect kg/m2/hr
First 37.1
Second 35.2
Third 32.2
Fourth 27.8

Batch Vaccum Pans

Pan Duty Heating Surface to Volume Ratio [m-1] Peak Evaporation Rate [kg/m2/hr]
Refined 7 98
Graining 6 78
A 6 58
B 5.5 49
C 5.5 39
Pan evaporation rates in tonne/hr
Pan Volume [m3] Refined Graining A B C
10 6.9 4.7 3.5 2.7 2.1
15 10.3 7.0 5.2 4.0 3.2
20 13.7 9.4 7.0 5.4 4.3
25 17.2 11.7 8.7 6.7 5.4
30 20.6 14.0 10.4 8.1 6.4
35 24.0 16.4 12.2 9.4 7.5
40 27.4 18.7 13.9 10.8 8.6
45 30.9 21.1 15.7 12.1 9.7
50 34.3 23.4 17.4 13.5 10.7
55 37.7 25.7 19.1 14.8 11.8
60 41.2 28.1 20.9 16.2 12.9
65 44.6 30.4 22.6 17.5 13.9
70 48.0 32.8 24.4 18.9 15.0
75 51.5 35.1 26.1 20.2 16.1
80 54.9 37.4 27.8 21.6 17.2
85 58.3 39.8 29.6 22.9 18.2
90 61.7 42.1 31.3 24.3 19.3
95 65.2 44.5 33.1 25.6 20.4
100 68.6 46.8 34.8 27.0 21.5