Technological and Technical Development of Tobacco Drying

Curing temperature,
Relative humidity, ϕ ϕ [ [%] [
80
70
60
50
40
30
20
10
0
100
0 20 40 60 80 100 120
Curing time, T [h]
Polinom .
(input dry
tem p.)
Polinom .
(output dry
tem p.)
Polinom . (w et
tem p.)
Figure 1. Temperature change of the curing air in the new technology.
90
80
70
60
50
40
30
20
10
0
0 20 40 60 80 100 120
Curing time, T [h]
Polinom .
(output rel.
hum .)
Polinom .
(input rel.
hum .)
Figure 2. Relative humidity change of the curing air in the new technology.
The exactly controlled temperature increment and reduction of the relative humidy of the drying air
results a better quality, regarding to the chemical components of the dried tobacco, and at the same time
the cost of the drying energy also more favorable, comparing with the conventional curing schedule
(Davis – Nielsen, 1999).
The cost of energy has a close relation with the air and heat consumption during drying. The variation of
the air demand is shown in Figure 3. The change of the heat requirement can be calculated from Figure 4.