Superheated steam fixation device and method

Abstract

The invention discloses superheated steam fixation device. The superheated steam fixation device comprises a fixation drying bin, a driving device, a supporting wheel, a discharging device, a feedingdevice, a gas guide pipe, a steam device, an exhaust device and a pipeline fan. Tea leaves continuously enter and exit from the fixation drying bin through the feeding device and the discharging device, so that continuous superheated steam fixation drying is realized. Moisture generated during fixation drying of the tea leaves is heated by the steam device to become superheated steam, the superheated steam at 60-380 DEG C is used for carrying out heat transfer fixation and heat and mass transfer drying on the tea leaves in the fixation drying bin, the heat transfer efficiency of the superheated steam and the tea leaves is enhanced, the tea leaves are free of oxidation reaction in the superheated steam fixation drying process in the fixation drying bin, the fixation and color fixation effects of the tea leaves are good, and the tea leaves are uniformly fixed and dried. During fixation of the superheated steam, the surfaces of the tea leaves are wet, the drying stress is small, and the drying defects of burnt leaves, burnt edges, broken tea, water stuffy taste and the like are avoided. The tea leaves after fixation and drying of the superheated steam are soft and tough, and the subsequent rolling process is facilitated.

Description

technical field [0001] The present invention relates to an equipment and method for fixing green, in particular to an equipment and method for fixing green with superheated steam. Background technique [0002] At present, when the high-temperature steam tea is green-fixed by the steam-fixing equipment, the high-temperature steam is the heat carrier during the green-fixing process. When the green tea is steam-fixed by the green-fixing equipment, the high-temperature steam in the saturated steam state is in contact with the fresh tea leaves, which is easy to yellow and produce a watery smell, which leads to a decrease in the quality of the tea leaves. The steam-cured tea leaves have high water content and hard leaves, which is not conducive to the subsequent tea rolling process. Under the premise of ensuring the quality of tea greening, it is necessary to optimize the design of greening equipment to achieve the effect of improving quality and efficiency. SUMMARY OF THE INVE...

AI Technical Summary

Problems solved by technology

When the greening equipment is steamed for tea leaves, the high-temperature steam in the saturated steam state contacts with fresh tea leaves, which will easily turn yellow and produce watery taste, which will reduce the quality of tea leaves

The water content of steamed tea leaves is high and the tea leaves are hard, which is not conducive to the subsequent tea rolling process

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