Cut leaf tobacco microwave vacuum drying equipment

Abstract

Cut leaf tobacco microwave vacuum drying equipment is characterized by comprising a vertical cylinder-shaped drying cavity, a vacuum-pumping system communicated with the drying cavity, and a microwave heating system, wherein the top part and the bottom part of the drying cavity are respectively provided with a feed port and a discharge port, the drying cavity is internally provided with a material dispersion mechanism, the material dispersion mechanism comprises a spindle arranged on the axle center of the drying cavity, and multi-layer material dispersion plates arranged on the spindle, the spindle is driven to rotate by a motor, the microwave heating system is divided into a continuous microwave heating unit arranged on the upper part of the drying cavity and a pulsed microwave heating unit arranged on the lower part of the drying cavity, and the two heating units can respectively hierarchically arranged in multi groups along the shell of the drying cavity. Compared with the prior art, the invention has the advantages that the cut leaf tobacco microwave vacuum drying equipment can carry out the microwave drying in stages to the cut leaf tobacco under the a vacuum status, reduces the drying temperature of the cut leaf tobacco, keeps the fragrant of the cut leaf tobacco, improves the aesthetic quality of the cut leaf tobacco, at the same time, can realize the rapid dehydration and drying of the cut leaf tobacco, and improves the filling value of the cut leaf tobacco.

Description

technical field [0001] The invention belongs to the technical field of tobacco processing, and in particular relates to a microwave vacuum drying equipment for shredded leaves. Background technique [0002] Shredded leaf drying is a key process in the process of tobacco shredded processing. Its technological task is to remove part of the moisture in the shredded leaf to meet the requirements for storage and rolling of the shredded leaf. At the same time, it also improves the sensory quality of the shredded leaf. Processing resistance. [0003] Existing shredded tobacco drying equipment mainly includes drum-type drying equipment, air-flow drying equipment and microwave drying equipment. Hot air convection is used for drying; microwave drying equipment (CN 201005012Y) uses microwave radiation to make the polar molecules in the material vibrate and rub to generate heat to dry the material. [0004] The existing shredded leaf drying equipment mainly has the following deficienc...

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Problems solved by technology

[0004] The existing shredded leaf drying equipment mainly has the following deficiencies: one is that the drying temperature is too high, and the shredded leaf aroma is greatly lost

The existing microwave vacuum drying equipment has the following deficiencies in the drying process of shredded leaves: ①The looseness of shredded leaves is low

Existing microwave vacuum drying equipment is designed for specific objects, such as: Chinese medicinal materials, fruits and vegetables, etc., which can meet the drying needs of these materials, but does not consider the technological requirements of leaf shred drying. When used for leaf shred drying, some agglomerated The shredded leaves are difficult to loosen during the drying process, which affects the moisture uniformity of the shredded leaves at the outlet, and also reduces the uniformity of the blended shredded leaves

② The law of drying and dehydration of shredded leaves is not considered, which makes the energy consumption of continuous microwave vacuum drying equipment larger, and the filling value of shredded leaves treated by pulsed microwave vacuum drying equipment is lower

The drying process of shredded leaves is divided into three stages: constant speed, falling speed and stagnant speed (see "Tobacco Science and Technology", 2004 (9): 6-15 pages), and the shredded leaves dried by continuous microwave vacuum can achieve Rapid dehydration and drying can increase the filling value of shredded leaves, but the dehydration rate of shredded shreds will decrease when entering the deceleration and stagnation stages. Continuing to use continuous microwave drying will cause energy waste; using pulsed microwave vacuum drying shredded leaves can reduce equipment energy consumption, but In the constant drying stage of shredded leaves, the dehydration rate cannot be increased, and the filling value of shredded shreds after drying is low

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