A microwave multistage fluidized bed drying device and drying method thereof

Abstract

The invention relates to a microwave multistage fluidized bed drying device and a drying method of the microwave multistage fluidized bed drying device. A fluidized bed dryer comprises a fluidized bed body and gas distribution plates, a microwave generator is arranged on the outer wall of the fluidized bed body, three layers of the gas distribution plates with adjustable angles are arranged in the fluidized bed body from top to bottom, the microwave generator is started, microwaves are used as a heat source, the inclination angle and the microwave power of the gas distribution plates are adjusted according to the surface temperature of detection materials, the aperture ratio of the gas distribution plates ranges from three percent to five percent, the adjustment air speed ranges from 1 m / s to 2 m / s, the raw material standing time is controlled to be within one min to five min, the water content in raw materials is smaller than 15 percent, and the dried materials enter a product drying tank from a discharge port. The microwave multistage fluidized bed drying device and the drying method of the microwave multistage fluidized bed drying device have the advantages that the standing time of the materials in a fluidized bed drying reactor is controlled by adjusting the inclination angles of the multistage distribution plates, and the materials with different water contents can be dried; maximum utilization of microwave energy is achieved by changing the microwave drying power at feed ports of the multistage distribution plates.

Description

technical field [0001] The invention and a drying device and method are especially suitable for materials with high water content, easy oxidation and spontaneous combustion, and especially relate to a microwave multi-stage fluidized bed drying device and a drying method thereof. Background technique [0002] Fluidized bed drying equipment is widely used in chemical industry, petroleum, food, biomedicine and other industries, and is suitable for drying various granular, flake and heat-sensitive materials. However, the traditional fluidized bed drying equipment has the following disadvantages: 1. Most of the currently used fluidized bed drying equipment is a single-stage fluidized bed. Uneven drying or overheating occurs; 2. The use of hot air in traditional fluidized bed drying media has the danger of oxidation, fire and explosion of the dried material, while the use of superheated steam will bring problems such as high energy consumption and water shortage; 3. The fluidized...

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Problems solved by technology

However, the traditional fluidized bed drying equipment has the following disadvantages: 1. Most of the currently used fluidized bed drying equipment is a single-stage fluidized bed. Uneven drying or overheating occurs; 2. The use of hot air in traditional fluidized bed drying media has the danger of oxidation, fire and explosion of the dried material, while the use of superheated steam will bring problems such as high energy consumption and water shortage; 3. The fluidized bed equipment with a built-in heat exchanger hinders the normal fluidization of the material due to the unreasonable setting of the buried pipe, especially when the material with high humidity just enters the dryer, it is easy to cause the accumulation and blockage of the material between the pipes. In addition, Fluidized bed drying technology with built-in heat exchanger still has problems such as serious wear of heat exchange tubes

However, the above equipment is not conducive to controlling the residence time of materials, prone to uneven drying or overheating, and it is difficult to achieve continuous drying

[0005] To sum up, there is currently no good coupling technology for microwave drying and fluidized bed drying, which can control the residence time of materials, continuously and uniformly enter and exit materials, low drying energy consumption, high drying efficiency, and high material quality. can guarantee

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