Understanding Industrial Drying 2 : A Guide to Heat Transfer Methods
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Understanding Industrial Drying 2 : A Guide to Heat Transfer Methods

Views: 10     Author: Site Editor     Publish Time: 2024-08-07      Origin: Site

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In industrial production processes, in order to ensure the required moisture content of products or to facilitate the storage and transportation of raw materials, it is necessary to remove some of the water or other liquids from solid materials, usually through drying methods. There are many ways to classify drying methods, and this article mainly discusses the classification according to the method of heat transfer.

1.Conduction Drying

Conduction drying involves placing wet materials on or attaching them to a high-temperature solid surface to receive heat through conduction, causing the moisture to vaporize. The steam is then carried away by surrounding airflow or extracted by vacuum equipment. Common indirect heat sources include steam, hot water, thermal oil, or electric heating.

Common conduction drying equipment includes: Hollow Screw Vacuum Dryers, conical vacuum screw dryers, vacuum rake dryers, hollow paddle dryers, disc dryers, and drum scraper dryers.

Advantages: High thermal efficiency.

Disadvantages: Materials in contact with the heat transfer surface can easily overheat, and the material layer should not be too thick. Our hollow screw vacuum dryer can effectively solve these problems.

2.Convection Drying

Convection drying involves directly contacting the drying medium (hot air or hot flue gas, etc.) with the wet material to supply heat through convection, with the steam generated by moisture vaporization also being carried away by the drying medium.

Common industrial convection dryers include: Centrifugal Spray Dryer, Belt Dryer, flash dryer,  Fluidized Bed Dryer, and Hot Air Circulation Oven.

Advantages: High production capacity, relatively low equipment investment, easy operation and control, easy adjustment of the temperature and humidity of the hot airflow, and uniform heating of the material. This is the most widely used drying method.

Disadvantages: Large consumption of hot airflow, more heat is carried awayand lost, and the thermal efficiency is lower than that of conduction drying.

3.Radiation Drying

Radiation drying transfers radiant energy to the surface of wet materials, where it is absorbed and converted into heat, causing moisture to vaporize and be discharged by additional airflow or vacuum equipment. Radiation dryers typically include far-infrared dryers, high-frequency dryers, and ultrasonic dryers. Hot air circulation ovens also use radiation drying.

Advantages: Particularly suitable for drying thin-layer materials. The arrangement of radiation sources can be adapted to the shape of the object being dried, making radiation drying dozens of times more productive than heat conduction or convection drying, with shorter drying times and more uniform drying.

Disadvantages: High electricity consumption.

4.Dielectric Heating Drying

Dielectric heating drying, including high-frequency drying and microwave drying, places wet materials in a high-frequency electric field, utilizing the alternating action of the high-frequency electric field to cause frequent molecular rotation, resulting in heat generation from the inside out and causing moisture to vaporize. Common dielectric heating drying equipment includes microwave dryers.

Advantages: Short drying time, uniform quality of the dried product, high degree of automation, especially suitable for drying food, pharmaceuticals, biological products, and materials that can deform, crust, or deteriorate when unevenly heated, or materials with moisture that is difficult to remove from the interior.

Disadvantages: High electricity consumption, high equipment and operational costs.


Industrial Dryers come in many varieties, each with its unique advantages and application fields. Whether you are engaged in the chemical, agricultural, food, or metallurgical industries, we can provide you with professional advice to help you choose the most suitable drying equipment to improve production efficiency and product quality. 

Please feel free to contact us, and our team of experts will provide customized solutions based on your material characteristics and production needs.

 

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