Experimental and Numerical Investigation of the Heat and Mass Transfer for Cut Tobacco During Two-Stage Convective Drying

Zhu, Wenkui; Wang, L.; Duan, Kejun; Chen, L. Y.; Li, B.

doi:10.1080/07373937.2014.997882

Cited by 36 publications

(24 citation statements)

References 28 publications

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“…The current drying methods for tobacco processing mainly include entrained flow drying and cylinder drying. [2,3] Entrained flow drying has a higher drying efficiency because of enhanced heat and mass transfer conditions. [4,5] In addition, it could improve the filling value of cut tobacco (a parameter describing a reduced apparent density of cut tobacco to achieve the same tobacco rod firmness), which is beneficial in reducing the tobacco consumption for cigarette making.…”

Section: Introductionmentioning

confidence: 99%

Fast drying of cut tobacco in drop tube reactor and its effect on petroleum ether tobacco extracts

Zhu

Wang

et al. 2017

Drying Technology

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Entrained flow drying is an important fast drying tool in tobacco industry. This study used a drop tube reactor (DTR) as an entrained flow dryer to investigate drying process of flue-cured cut tobacco. Lab-scale cold and hot DTRs were set up to obtain drying kinetics for three types of cut tobacco using different drying gases and temperatures. The effective diffusion coefficients of cut tobacco in DTRs were compared with those in a general cylinder dryer. Moreover, the effects of different drying gases and temperatures on petroleum ether extract content were investigated. The results showed that the effective diffusion coefficients of cut tobacco in the DTRs were between 2.296 � 10 −8 and 8-6.244 � 10 −8 m 2 /s, which are two orders of magnitude higher than those in the cylinder dryer. Compared to hot air as a drying medium, superheated steam improved the effective diffusion coefficient of cut tobacco. The petroleum ether tobacco extract had a higher retention ratio when the superheated steam was used in the DTRs. An increase in the drying temperature resulted in a lower retention of the petroleum ether tobacco extract. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Fast drying of cut tobacco in drop tube reactor and its effect on petroleum ether tobacco extracts

Zhu

Wang

et al. 2017

Drying Technology

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“…Tobacco curing (TC) is the key link to ensuring and solidifying the quality of flue-cured/Virginia tobacco [1], which accounts for more than 80% of the energy used in the production process [2]. Coal direct combustion is widely used for heating since over a century in China, with low combustion efficiency and serious environmental pollution [3].…”

Section: Introductionmentioning

confidence: 99%

Application of automatic control furnace for combustion of biomass briquette fuel for tobacco curing

Song

Wei

Su³

et al. 2021

Therm sci

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Applying biomass energy for curing flue-cured/Virginia tobacco heating is the best way to realize green tobacco production. Aiming to satisfy the heating demand for flue-cured tobacco curing, a new heating device that uses biomass briquettes as fuel for curing tobacco is adopted the first time, which was developed using modern mature electromechanical and computer technology. The new device consists of automatic feeding, ash cleaning, ventilation, and ignition systems governed by an intelligent tobacco-curing controller designed for specific curing characteristics. The results of experiments conducted with an original direct combustion coal furnace, bulk curing barn, and controlled coal-fired heating indicated that the heat supply of the new device could satisfy the heat demand during the tobacco curing process, with a good performance-controlling difference of ± 0.5 °C between the actual and target dry-bulb temperature in the barn. With its unattended heating management and use of fully burning fuel, the new device sharply decreased the cost of manual operation and tobacco leaves required per kilogram compared to a coal furnace. Considering the shape of its structure, the new device could be used to heat homes or small-scale boilers if the chip procedure of the controller is altered.

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“…Carotenoid degradation products contents retained for two-stage drying of 130/100 and 140/100°C were 5.94 and 5.91 µg/g, which were even close to the level of single-stage drying at 100°C. A previous work [27] has shown that the two-stage drying method, which used high air temperature for early period and low one for late period, could decrease the final temperature of the dried cut tobacco significantly. The reduced exposure to high temperature for tobacco due to low final temperature is beneficial for flavor components retention during drying.…”

Section: Effect Of Cylinder Wall Temperaturementioning

confidence: 99%

“…At the falling rate period, cut tobacco temperature will have an obvious rise with decreasing moisture content. [27] The exposure of dried samples to high temperature occurs mainly at this drying stage. This could explain the greater influence of final drying temperature on the flavor component retention.…”

Section: Effect Of Cylinder Wall Temperaturementioning

confidence: 99%

“…Although two-stage drying strategy has been presented for dehydration of flue-cured tobacco by analyzing heat and mass transfer during two-stage convective drying in our previous work, [27] the effect of two-stage drying on the retention of characteristic flavor components in tobacco has not been investigated thoroughly. Therefore, two-stage rotary drying of flue-cured tobacco was performed in the present study, and characteristic flavor components retentions of dehydrated products for different two-stage drying conditions were investigated and compared with the single-stage drying.…”

Section: Introductionmentioning

confidence: 99%

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Effect of two-stage dehydration on retention of characteristic flavor components of flue-cured tobacco in rotary dryer

et al. 2016

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Experimental and Numerical Investigation of the Heat and Mass Transfer for Cut Tobacco During Two-Stage Convective Drying

Cited by 36 publications

References 28 publications

Fast drying of cut tobacco in drop tube reactor and its effect on petroleum ether tobacco extracts

Fast drying of cut tobacco in drop tube reactor and its effect on petroleum ether tobacco extracts

Application of automatic control furnace for combustion of biomass briquette fuel for tobacco curing

Effect of two-stage dehydration on retention of characteristic flavor components of flue-cured tobacco in rotary dryer

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