CN103196280B - Plant stem and leave drying method - Google Patents

Abstract

The invention discloses a method for drying plant stems and leaves. The present invention uses microwave fluidized bed equipment to dry the wet materials of plant stems and leaves. The microwave fluidized bed equipment recorded in the new patent; the drying temperature is controlled at 50-90°C, and the wind speed is 0-30m/s. While using microwave fluidized bed equipment for drying, it is also combined with hot air or microwave for drying. The diameter of the plant stem and leaf wet material is 2cm-8cm, and the water content is 12%~25%. The method solves the problems of excessive local temperature, long time consumption, and uneven drying when drying plant stems and leaves, resulting in partial zooming of plant stems and leaves, uneven drying, and color decline. It has the characteristics of low ambient temperature of the product during drying, little effect on the appearance of the sample surface, low energy consumption, simple process, and convenient operation.

Description

A method for drying plant stems and leaves

technical field

The invention relates to a method for drying plant stems and leaves.

Background technique

At present, the stems and leaves of plants in tea production plants or plant raw material processing plants are generally dried in ovens or microwaves. The drying method has the following disadvantages: long time, high drying temperature, resulting in high energy consumption; High, causing the surface of plant stems and leaves to appear cracked and scorched.

Contents of the invention

The purpose of the invention is to overcome the deficiencies in the prior art and provide a method for drying plant stems and leaves. The method of the invention has the advantages of simple operation, low energy consumption, short time consumption and low drying temperature, and can avoid the scorching phenomenon of the surface of plant stems and leaves.

In order to achieve the above object, the present invention adopts the following technical solutions:

The invention discloses a method for drying plant stems and leaves, which uses microwave fluidized bed equipment to dry plant stems and leaves wet material.

In the above drying method, the microwave fluidized bed equipment is the microwave fluidized bed equipment described in the Chinese Utility Model Patent No. 201220174418.0, titled "A Microwave Fluidized Bed Equipment for Drying Solid Particles".

In the above drying method, the drying temperature is controlled at 50-90° C., and the wind speed is 0-30 m/s.

In the above drying method, while using microwave fluidized bed equipment for drying, hot air or microwave is also combined for drying.

In the above drying method, the diameter of the plant stem and leaf wet material is 2cm-8cm, and the water content is 12%-25%.

Compared with the prior art, the present invention has the following beneficial effects: the present invention introduces microwave fluidized bed equipment into the drying of plant stems and leaves, which solves the problem of excessive local temperature, long time-consuming, and uneven drying of plants when drying plant stems and leaves. Partial zooming of stems and leaves, uneven drying, loss of color and other problems. The invention has the characteristics of low ambient temperature of the product during drying, little influence on the appearance of the sample surface, low energy consumption, simple process, convenient operation and the like.

Detailed ways

Taking tea as the drying object, changing the microwave power, wind speed, and material quality, and controlling the temperature in the chamber below 80°C, the influence of the microwave fluidized bed on the drying rate was investigated.

The wet material of plant stems and leaves is put into the microwave fluidized bed equipment recorded in the Chinese utility model patent No. 201220174418.0 titled "A Microwave Fluidized Bed Equipment for Drying Solid Particles" for drying. Put the wet material of plant stems and leaves into the layering system of microwave fluidized bed, dry to the water content <5%, remove the plant stems and leaves from the layering system, and obtain the dried product.

Example 1:

The drying temperature is controlled at 70°C. Put the tea products into the three-layer partition of the microwave fluidized bed equipment (about 150 grams per layer), set the microwave power to 400W, and fully open the adjustment valve. At this time, the wind speed is 30m/s , first blow with hot air at 60°C for 20 minutes, then turn on the microwave fluidized bed equipment for drying, and the drying time is 30 minutes. After inspection, the moisture content of the dried product is 4%.

Example 2:

The drying temperature is controlled at 80°C. Put the tea products into the three-layer partition of the microwave fluidized bed equipment (about 250 grams per layer), set the microwave power to 600W, and fully open the adjustment valve. At this time, the wind speed is 25m/s , blow with hot air at 70°C for 20 minutes, then dry with microwave for 5 minutes, and then turn on the microwave fluidized bed equipment for drying, the drying time is 40 minutes. After inspection, the moisture content of the dried product is 5%.

Example 3:

The drying temperature is controlled at 80°C. Put the tea products into the three-layer partition of the microwave fluidized bed equipment (about 200 grams per layer), set the microwave power to 800W, and fully open the adjustment valve. At this time, the wind speed is 25m/s , first use microwave to dry for 20 minutes, then turn on microwave fluidized bed drying, and the drying time is 30 minutes. After inspection, the moisture content of the dried product is 6%.

Example 4:

The drying temperature is controlled at 60°C. Put the tea products into the three-layer partition of the microwave fluidized bed equipment (about 200 grams per layer), set the microwave power to 600W, and fully open the adjustment valve. At this time, the wind speed is 30m/s , The drying time is 40-95min. After inspection, the moisture content of the dried product is 4.5%.

Example 5:

The drying temperature is controlled at 70°C. Put the tea products into the three-layer partition of the microwave fluidized bed equipment (each layer is about 100 grams), set the microwave power to 1200W, and adjust the valve to open 1/2. At this time, the wind speed is 30m /s, the drying time is 50-80min. After inspection, the moisture content of the dried product is 5%.

Embodiment 6:

The drying temperature is controlled at 50°C. Put the tea products into the three-layer partition of the microwave fluidized bed equipment (about 300 grams per layer), set the microwave power to 900W, and adjust the valve to open 1/2. At this time, the wind speed is 25m /s, the drying time is 50-75min. After inspection, the moisture content of the dried product was 9%.

Claims (1)

1. the drying means of a plant stem-leaf, it is characterized in that comprising the steps: that baking temperature controls at 70 DEG C, tea products is put into three layers of microwave fluidized-bed equipment every dish, setting microwave power is 400W, control valve standard-sized sheet, now wind speed is 30m/s, first advertises 20min with the hot blast of 60 DEG C, then open microwave fluidized-bed equipment dry, drying time is 30min; Through inspection, dry products moisture is 4%.