Airflow type leaf thread drying plant

Abstract

The invention relates to airflow leaf shred drying equipment which comprises an upright drying pipe, a cyclone separating device, and a steam cycle system connected with a main air blower. The equipment is characterized in that a feeding hole is arranged at the top end of the drying pipe which is upwards divided into a first drying pipe and a second drying pipe which are in straight pipe shapes and an infundibular third drying pipe in sequence beginning from an air inlet; the pipe diameter of the second drying pipe is larger than that of the first drying pipe, and the small end of the third drying pipe is connected with the second drying pipe; the upper part of the drying pipe is provided with a separating and receiving cover connected with the pipe orifice of an output pipe, the separating and receiving cover is small at the upper part and large at the lower part, and the lower end of the separating receiving cover is arranged in the middle of the third drying pipe. Through the invention, a stable leaf shred with even water at the outlet can be obtained, and the water ratio of the leaf shred can be adjusted; the dry gas has lower temperature, thereby lowering the aroma loss of the leaf shred, reducing the broken surface and reversion phenomena, and preventing the leaf shred from overdrying; in addition, sundries such as a peduncle can be eliminated while the leaf shred is dried.

Description

technical field [0001] The present invention relates to the manufacturing equipment of shredded tobacco leaves, in particular to an air-flow type shredded leaf drying equipment. Background technique [0002] In recent years, the air-flow shredded leaf drying equipment has been widely used in China. Most cigarette companies use it to dry the shredded leaves of cigarettes. Because the air-flow shredded leaf drying equipment has short drying time and high expansion efficiency, it can remove leaf shreds. It is very suitable for the processing of middle and low-grade cigarettes because it has the characteristics of reducing the miscellaneous gas of silk and reducing the miscellaneous gas. The basic principle of the air-flow type leaf shred drying is that the leaf shreds are in contact with high-temperature, high-speed superheated steam, and the leaf shreds are heated in a very short time. Through the diffusion of water, the water in the leaf shreds diffuses to the surface, and th...

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Problems solved by technology

[0004] (2) External inhomogeneity: Since the blade filaments cannot achieve absolute uniformity in the dry air flow, there is also inhomogeneity in the distribution of the airflow velocity in the pipeline. The airflow velocity in the center of the pipeline is often higher than that on both sides, so the blade filaments in the vertical pipeline It is easy to concentrate in the center, resulting in different drying conditions and obvious moisture differences among leaf silks in different distributions

[0008] In order to solve the above problems, manufacturers of airflow shredded shreds drying equipment have adopted many methods such as increasing the drying gas temperature, flow control accuracy, and improving the uniformity of shredded shredded materials, but the effect is not obvious.

In addition, after drying, the leaf shreds output from the cyclone separator will also enter the screening device for screening to remove the stems, stems and other sundries mixed in the leaf shreds, which makes the production process of the leaf shreds complicated.

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