Airflow drying method and device for dispersed material

An airflow drying and material technology, applied in the direction of drying gas arrangement, drying machine combination, drying solid materials, etc., can solve the problems of complex structure of solid material circulation device, impingement flow is difficult to meet the drying requirements, and cycle drying time is difficult to control, etc., to achieve The effect of prolonging the intensive drying time, improving the utilization efficiency of heat medium, and uniform radial distribution of gas and solid

Active Publication Date: 2010-06-09
ZHENGZHOU TOBACCO RES INST OF CNTC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 c

Method used

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  • Airflow drying method and device for dispersed material
  • Airflow drying method and device for dispersed material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Taking the drying of shredded tobacco in tobacco processing as an example, as shown in Figure 1, the moisture content of the shredded tobacco sent into the bin 11 after the shredding process is between 18% and 22%. Enter the acceleration tube 2, the gas velocity in the acceleration tube is between 15-30m / s, and the temperature of the hot air is between 120-250°C. In order to reduce the crushing of tobacco materials, only one hot air carries the materials in the coaxial horizontal impinging flow contactor. The two fluids enter the coaxial horizontal impinging flow contactor barrel 3 through the accelerating tube, forming an impacting area in the contactor. After leaving the impacting area, the shredded tobacco falls into the lower part of the impinging flow contactor. Carried by the hot air, the shredded tobacco passes through the Venturi distribution. The device 4 enters the gas-solid and flows down the descending bed 5. After the cut tobacco is dried in the coaxial ho...

Embodiment 2

[0024] Taking the drying of grain feed pellets as an example, as shown in Figure 1, the hot air carries the materials into the acceleration tube 1 and the acceleration tube 2 respectively, and the two streams enter the coaxial horizontal impingement flow contactor cylinder 3 through the acceleration tube, forming a flow in the contactor. In the impact area, the grain feed particles leave the impact area and fall into the lower part of the impact flow contactor. Carried by the hot air, they enter the gas-solid co-current descending bed 5 through the Venturi distributor 4 . After the grain feed particles are dried in the coaxial horizontal impingement flow contactor and the gas-solid co-current down-flow bed, they are separated by the cyclone separator 6 and discharged through the discharge valve, and the hot air is recycled after dehumidification.

Embodiment 3

[0026] Taking the drying of PVC powder particles as an example, as shown in Figure 1, the hot air carries PVC powder particles into the acceleration tube 1 and the acceleration tube 2 respectively, and the two fluids enter the coaxial horizontal impingement flow contactor cylinder 3 through the acceleration tube. An impact area is formed, and PVC powder particles leave the impact area and fall into the lower part of the impact flow contactor, carried by the hot air, and enter the gas-solid co-flow down-flow bed 5 through the Venturi distributor 4 . After the PVC powder particles are dried in the coaxial horizontal impingement flow contactor and the gas-solid co-current down-flow bed, they are separated by the cyclone separator 6 and discharged through the discharge valve, and the hot air is recycled after dehumidification.

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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, ...

Claims

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Application Information

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IPC IPC(8): F26B3/10F26B20/00F26B21/00
Inventor 朱文魁陈良元李斌张彩云
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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