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Convection drying tobacco heated degree measuring method

A technology of convection drying and drying process, which is applied in the direction of tobacco, prepared tobacco, moisture content of materials, etc., and can solve the problem that the single-point outlet temperature cannot accurately represent the heating of shredded tobacco

Active Publication Date: 2017-12-12
CHINA TOBACCO HENAN IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, shredded tobacco drying is a changing heating process, and the outlet temperature at a single point cannot accurately represent the heating of shredded tobacco during the entire drying process.

Method used

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  • Convection drying tobacco heated degree measuring method
  • Convection drying tobacco heated degree measuring method
  • Convection drying tobacco heated degree measuring method

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Embodiment Construction

[0026] like figure 1 Shown, a kind of method for measuring the degree of heating of shredded tobacco in the convection drying of the present invention comprises the following steps:

[0027] A. Assuming that the convective heat transfer coefficient, the effective area in contact between the cut tobacco and the drying medium and the specific heat capacity of the cut tobacco are constant during the drying process of cut tobacco, the energy transfer process of cut tobacco drying is described by the energy conservation equation:

[0028]

[0029] Where h—convective heat transfer coefficient [W / (m 2 .°C)]; A—the effective area of ​​the shredded tobacco in contact with the hot air in the convective heat exchange (m 2 ); T a — drying medium dry bulb temperature (°C); T — tobacco surface temperature (°C); M t — mass of shredded tobacco (kg); C t - Specific heat capacity of shredded tobacco [J / (kg.℃)]; R w —Latent heat of vaporization of water (J / kg); X—moisture content of cut ...

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Abstract

The invention discloses a convection drying tobacco heated degree measuring method. The convection drying tobacco heated degree measuring method comprises the following steps of A, describing the energy transfer process of tobacco drying through energy conservation equation; B, describing the change rules of moisture ratio to time during a tobacco drying process; C, representing dry-basis tobacco moisture by moisture ratio to simplify the energy conservation equation; D, assuming initial conditions of tobacco drying to computing a change model of tobacco surface temperature to moisture; E, representing the heated degree of tobacco during a convection drying process by tobacco drying characteristic temperature. The convection drying tobacco heated degree measuring method can accurately describe the heated conditions of the tobacco during the convection drying process and provide a basis for further research on rules of influence of tobacco heated degree on tobacco quality.

Description

technical field [0001] The invention relates to the technical field of tobacco processing, in particular to a method for measuring the heat degree of shredded tobacco in convection drying. Background technique [0002] The processing of shredded tobacco is a process accompanied by moist heat treatment, and there are relatively complex heat transfer and mass transfer phenomena in the process. This process has an important impact on the physical and chemical quality and sensory quality of cigarettes. As shredded tobacco is a heat-sensitive material, excessive heat treatment will inevitably lead to the loss of flavor components in shredded tobacco, which will eventually affect the quality of cigarettes. Therefore, it is very important to study the influence of the degree of heat on shredded tobacco on the quality of shredded tobacco. At present, there are few methods for characterizing the degree of heating of shredded tobacco, and the outlet temperature is generally used to ch...

Claims

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Application Information

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IPC IPC(8): G01N25/58G01N25/62A24B3/04
CPCA24B3/04G01N25/58G01N25/62
Inventor 段鹍罗灿选付瑜锋于建春王宝林王冰郑飘胡少东王鹏飞刘欢李龙飞
Owner CHINA TOBACCO HENAN IND
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