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A method for determining the degree of heating of shredded tobacco in convection drying

A technology of convective drying and convective heat transfer coefficient, 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: 2019-10-29
CHINA TOBACCO HENAN IND
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  • Summary
  • 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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  • A method for determining the degree of heating of shredded tobacco in convection drying
  • A method for determining the degree of heating of shredded tobacco in convection drying
  • A method for determining the degree of heating of shredded tobacco in convection drying

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Embodiment Construction

[0026] Such as 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 c...

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Abstract

The invention discloses a method for measuring the heating degree of cut tobacco in convective drying, comprising the following steps: A. The energy conservation equation is used to describe the energy transfer process of the cut tobacco drying; B. The Newton model is used to describe the change of the moisture content ratio with time in the tobacco drying process. Change law; C. The moisture content ratio of cut tobacco is used to characterize the moisture content of cut tobacco, and the energy conservation equation is simplified; D. Assuming the initial conditions of cut tobacco drying, calculate the variation model of the surface temperature of cut tobacco with the moisture content ratio; E. The characteristic temperature of cut tobacco drying is used to characterize cut tobacco The degree of heat exposure during convection drying. The invention accurately describes the heating situation of the cut tobacco during the convection drying process, and provides a basis for further research on the influence of the heating degree of the cut tobacco on the quality of the cut tobacco.

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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Patent Type & Authority Patents(China)
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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