Airflow drying device for dispersed material

Abstract

The invention relates to airflow drying method and device for a dispersed material. The method is characterized in that the material is dried in a way of combining an impinging stream and a gas-solid cocurrent downlink bed, and the material is firstly subjected to an initial drying in an impinging stream contactor and then enters the gas-solid cocurrent downlink bed to exchange heat and mass witha drying medium to finish the drying process. The device comprises an impinging stream contactor cylinder body, wherein two airflow accelerating pipes are correspondingly arranged on the cylinder body; the lower end of the cylinder body is connected with the vertical gas-solid cocurrent downlink bed by a Venn distributor, and the lower end of the gas-solid cocurrent downlink bed is connected witha cyclone separator. Compared with a simple impinging stream drying method, the invention can prolong the strengthened drying time of the material and improve the utilization efficiency of a heat medium; and compared with a raising pipe airflow drying way, the gas-solid cocurrent downlink bed has evener gas-solid radial distribution and low agglomeration degree of particles and can effectively overcome the axial back mixture of the particles. The invention also has the characteristics of simple and compact device and simple and convenient operation.

Description

technical field [0001] The invention relates to a method and device for air drying of dispersed materials, in particular to a method and device for integrating impinging flow and gas-solid co-current down-flow bed for drying dispersed materials. Background technique [0002] During the drying process, the heat energy is transferred from the hot gas to the wet material by convection, which is the most widely used drying method in industry at present. The air drying technology based on the convection drying method uses high-speed hot air to suspend the solid particles to be dried in the fluid, and the material is dried in the air conveying. Airflow drying has large heat transfer area and high thermal efficiency. [0003] Riser airflow drying is a widely used airflow drying technology. The dryer has a simple structure and is easy to operate. , Jin Yong, etc., Tsinghua University Press), the phenomenon of uneven drying of materials is prone to occur during the drying process, ...

AI Technical Summary

Problems solved by technology

Short residence time, for materials with high moisture content or materials that are difficult to dry, pure impingement flow is difficult to meet the drying requirements

Patent CN2338704Y and patent CN2616874Y proposed two kinds of circulation impingement flow dryers, the material circulates into the collision chamber for many times, which can prolong the intensive drying time, but it has the complex structure of the solid material circulation device, the difficulty of controlling the circulation drying time, and the circulation of material particles. The impact area is prone to shattering defects

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