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Drying process and equipment suitable for materials with large particle size difference and high requirements on product moisture content uniformity

A technology of particle size and moisture content, which is applied in the directions of drying solid materials, drying gas layout, lighting and heating equipment, etc., can solve problems such as difficulty in discharging bulk materials, inconsistent drying degree, and product moisture content not meeting the requirements, etc. Achieve uniform moisture content, prolong drying time and save energy.

Active Publication Date: 2021-02-23
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems such as inconsistent drying degree, product moisture content not meeting the requirements, and difficulty in discharging bulk materials when the traditional horizontal fluidized bed is used to dry materials with a large particle size difference, the present invention proposes a suitable For the drying system and equipment of materials with large particle size difference and high requirements on the uniformity of product moisture content, the moisture content of solid products obtained by the system of the present invention is basically the same, which can realize uniform drying of products with different particle sizes, and automatic separation of lumps and dust , to ensure continuous operation

Method used

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  • Drying process and equipment suitable for materials with large particle size difference and high requirements on product moisture content uniformity
  • Drying process and equipment suitable for materials with large particle size difference and high requirements on product moisture content uniformity
  • Drying process and equipment suitable for materials with large particle size difference and high requirements on product moisture content uniformity

Examples

Experimental program
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Effect test

Embodiment 1

[0068] In a horizontal multi-chamber fluidized bed dryer with a specification of 700×100mm, in the structure of a gas distribution plate, the included angles between the direction of the airflow blown out from the nail hole and the direction of material movement on the upper and lower sides are α and β respectively. , α=β=150°. The nail holes on the gas distribution plate are arranged in ABAB mode. When the opening rate is 3%, the average residence time of particles with a particle size of 0.5~1.0mm and 1.6~2.5mm is 20.2min and 27.6min, respectively.

[0069] Thermal model experiments were carried out with molecular sieves, the net bed height was 80mm, the inlet air temperature was 150°C, and the fluidization gas velocity was 1.16m / s. The initial moisture content of the wet material is 21.08%. After drying for 20.2 minutes, the moisture content of particles with a particle size of 0.5-1.0 mm is 5.63%, and after drying for 27.6 minutes, the moisture content of particles with a ...

Embodiment 2

[0071] In a horizontal multi-chamber fluidized bed dryer with a specification of 700×100mm, in the structure of a gas distribution plate, the included angles between the direction of the airflow blown out from the nail hole and the direction of material movement on the upper and lower sides are α and β respectively. , α=β=30°. The nail holes on the gas distribution plate are arranged in ABAB mode. When the opening rate is 3%, the average residence time of the particles with a particle size of 0.5~1.0mm and 1.6~2.5mm is 17.1min and 10.4min, respectively.

[0072] Thermal model experiments were carried out with molecular sieves, the net bed height was 80mm, the inlet air temperature was 150°C, and the fluidization gas velocity was 1.16m / s. The initial moisture content of the wet material is 21.08%, and the moisture content of the particles with a particle size of 1.6-2.5 mm measured after drying for 10.4 minutes is 12.32%; the moisture content of particles with a particle size o...

Embodiment 3

[0074] The process flow chart of the drying system for the initial heat softening and sticky materials, see Figure 7 .

[0075] The wet material is continuously fed into the first chamber of the horizontal multi-chamber fluidized bed dryer 02 through the screw feeder 01, and enters the primary drying section, drying section, and cooling section in turn under the action of the drying medium for fluidization, drying, and drying. After cooling, it enters the dust separation system 02-9 to separate the powder, and the dried product is discharged from the product outlet 02-11, discharged through the star discharger 03, screened by the sieving machine 04, and packaged for storage.

[0076] The drying medium is air, which enters the horizontal multi-chamber fluidized bed dryer 02 in five ways, one way is the air for the post-drying section; the second way is the air for the cooling section and the dust separation system; the third way is the air for the agglomerate crushing and sepa...

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Abstract

The invention discloses a drying process and equipment suitable for materials with large particle size difference and high requirements on product moisture content uniformity. The drying process comprises the following steps of 1, material drying and cooling; 2, drying medium-part tail gas circulating; 3, block mass crushing and separating; and 4, dust separating. A horizontal multi-chamber fluidized bed dryer is provided with a material inlet, a product outlet, a block mass outlet and three tail gas outlets, wherein the product outlet is formed in the last chamber of the horizontal multi-chamber fluidized bed dryer; the block mass outlet is formed in the first chamber of the horizontal multi-chamber fluidized bed dryer; one of the three tail gas outlets is formed in the primary drying section and the before-drying section, and is high-humidity tail gas which is discharged after dust removal; and the other two tail gas outlets are low-humidity tail gas which can be recycled. A gas distribution plate of a special structure is adopted, the residence time of large-particle materials can be prolonged, the moisture content of coarse and fine particle products is uniform, and energy conservation, consumption reduction and low emission can be achieved in the partial tail gas circulation process and a block mass crushing and separating system.

Description

technical field [0001] The application relates to the field of drying technology, in particular to a drying process and equipment suitable for materials with large particle size differences and high requirements on product moisture content uniformity. Background technique [0002] At present, a horizontal multi-chamber fluidized bed dryer is mostly used to dry powder materials. The wet materials are fluidized, dried and cooled through each drying chamber in turn under the action of the drying medium. The dried products are discharged from the material outlet and packaged. store. Because the perforated plate has the characteristics of self-cleaning distribution plate, it is widely used, and the angles α and β between the direction of punching airflow and the direction of material flow are usually 0~60°. On the bed surface, the block material is conveniently discharged and can be operated continuously. However, there is a problem that when the particle size of the material i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/08F26B21/00F26B25/22B02C13/14
CPCF26B3/08F26B21/001F26B25/22B02C13/14
Inventor 郑燕萍邱国珍程榕杨阿三屠美玲李琰君贾继宁
Owner ZHEJIANG UNIV OF TECH