Technological and Technical Development of Tobacco Drying

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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.
Air demand, [kg/kg wate Heat demand, [kJ/kg water 90 80 70 60 50 40 30 20 10 0 6000 5000 4000 3000 2000 1000 new technology conventional technology 8 32 56 72 92 104 124 136 0 Curing time, T [h] Figure 3. Variation of the air demand of curing. new technology conventional technology 8 32 56 72 92 104 124 136 Curing time, T [h] Figure 4. Variation of the heat requirement of curing. The main aim was to monitor the influence of different practical features on the important quality characteristics. Fulfilling this requirement, I arranged to study altogether four curing cycles on two farms, applying a conventional and an advanced technology at the same time. Four samples were taken from each curing barn and transported to the local quality-testing laboratory of the tobacco processing company, where the four most important internal components were identified (carbohydrate, reducing, sugar, total nitrogen, nicotine). In addition they measured the moisture content. The results of the analytical work are summarized in Table 2.
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Technological and Technical Development of Tobacco Drying

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