Tobacco stem expanding method and equipment using low-pressure steam as medium

Abstract

The invention providing a tobacco stem expanding method and equipment which can realize tobacco stem expansion by utilizing conventional-pressure steam in a tobacco factory and basically reach the expansion ratio of tobacco stem expansion implemented through high-pressure steam. The tobacco stem expanding method comprises the following steps: by using steam as a medium, carrying out temperature-rise treatment for a tobacco stem, and expanding, wherein the steam medium is conventional-pressure saturated steam or superheated steam; firstly heating the tobacco stem through the steam medium and realizing primary expansion through a first expanding device; and realizing secondary expansion of the tobacco stem after the primary expansion through a second expanding device. The tobacco stem expanding equipment comprises a charging steam lock and a tobacco stem heating device which are sequentially communicated, and the tobacco stem heating device is communicated with a steam medium passage; the discharge end of the tobacco stem heating device is sequentially connected in series with the first expanding device and the second expanding device; and the second expanding device is provided with a steam supplementing opening introduced into the steam medium. The invention ensures that an ideal tobacco stem expanding effect is obtained under the action of the conventional-pressure steam medium through implementing multistage expansion for the tobacco stem.

Description

technical field [0001] The invention relates to a method for expanding tobacco stems, in particular to a method for expanding tobacco stems by using steam as a treatment medium. [0002] The present invention also relates to a device for realizing the above tobacco stem expansion method. Background technique [0003] There are three main purposes of tobacco stem treatment: one is to increase the filling value of cut stems; the other is to improve the combustibility of cut stems; the third is to remove or reduce the woody smell of cut stems. The key technology to achieve the above-mentioned purpose of stem processing technology is to improve the expansion rate of tobacco stem processing. [0004] There are two main traditional cut stem expansion processing technologies: one is high-humidity cut stem rapid dehydration to realize the expansion of cut stem; the other is high-humidity cut stem expansion through a venturi tube. The timing of the expansion of the tobacco stems in...

AI Technical Summary

Problems solved by technology

The tobacco stem expansion timing of these two expansion methods is implemented after shredding, and its disadvantages are: (1) the requirement for the balance of the feed moisture is high, generally reaching ± 1%; (2) the uniformity of expansion is poor , the crushing rate is high, due to the difference in the thickness of the cut stems, the expansion of the cut stems is very uneven, the crushing rate of the cut stems after expansion is high, and the utilization rate of the cut stems is low. Sampling reaches about 3%

(3) The expansion rate of cut stems is not high, generally speaking, the maximum can only reach 60%

[0008] However, the above-mentioned patents all use high-temperature and high-pressure steam as the expansion medium of the tobacco stem. If the conventional pressure steam provided by the tobacco factory is used to expand the tobacco stem by the above method, it is often difficult to achieve a satisfactory expansion effect because the steam pressure is too low.

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