Airflow Drying Equipment
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Yun Fen Technology
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Product Description
Introduction
Wet materials are fed quantitatively and uniformly into the lower part of the drying tube via a speed-adjustable spiral feeder. They are dispersed by a high-speed hot air stream and undergo heat and mass transfer during the cocurrent gas-solid flow process, enabling the materials to dry. The dried solid materials enter the cyclone separator with the air stream, are separated, and collected. The waste gas is discharged by a fan. Due to the high-speed flow of gas relative to the material particles and the large contact area between the gas and solid phases, the volumetric heat transfer coefficient is quite large. Airflow drying is suitable for processing materials with small particle sizes where the drying process is mainly controlled by surface vaporization.
Features
(1) High drying intensity: In airflow drying, due to the airflow velocity and good particle dispersion in the gas phase, the entire surface area of the particles can be used as the effective drying area, significantly increasing the effective drying area. Simultaneously, due to the dispersion and mixing during drying, the vaporization surface is constantly renewed, resulting in a high intensity of heat and mass transfer during drying.
(2) Short drying time: The contact time between the gas and solid phases is very short, generally 0.5-2 seconds, up to 5 seconds. Therefore, heat-sensitive or low-melting-point materials will not be overheated or decomposed, affecting their quality.
(3) High thermal efficiency: Airflow drying uses a cocurrent gas-solid operation. Moreover, in the surface vaporization stage, the material is always at the wet-bulb temperature of the gas in contact with it, generally not exceeding 60-65 degrees Celsius. In the final stage of drying when the material temperature rises, the gas temperature has already decreased significantly, and the product temperature will not exceed 70-90 degrees Celsius. Therefore, high-temperature gas can be used.
(4) High throughput, simple equipment: Airflow dryers have simple equipment, small footprint, and low investment. Simultaneously, drying, crushing, screening, and conveying unit processes can be combined, simplifying the process and making operation easier to automate.
(5) Wide range of applications: Airflow drying is suitable for various powdery and granular materials. When feeding directly into the airflow drying tube, the particle size can reach 10 mm, and the moisture content can be between 10% and 40%.
(6) Optional heat sources: Steam heat exchange, electric heating, gas/oil combustion, indirect hot air furnace using coal combustion, flue gas from coal combustion, or mixed heat sources.
(7) The high airflow velocity causes some particle abrasion and pulverization, making it unsuitable for products with strict crystal form requirements. It is also unsuitable for materials that easily stick to the walls, are very viscous, or need to be dried to below the critical moisture content. Airflow drying is also unsuitable for materials that produce toxic gases during drying.
Applicable Material Fields
(1) Chemical: Dicalcium phosphate, plastic resins, copper sulfate, ferrous sulfate, zinc sulfate, sodium fluorosilicate, p-aminophenol, sodium bicarbonate, various inorganic and organic salts.
(2) Food: Potato starch, corn starch, sweet potato starch, cassava starch, glutinous rice flour, konjac flour, modified starch.
(3) Feed: Rice bran, distillers' grains, brewer's spent grain, rapeseed meal, active yeast, spent grain from alcohol production, feed microelements (sulfates).
(4) Others: Oral glucose, enzyme preparations, coal powder, sawdust, wood chips, traditional Chinese medicine, puffed rice hulls.
Equipment Specifications and Models
| Model | GQM100 | GQM150 | GQM200 | GQM300 | GQM400 | GQM500 | GQM600 | GQM800 | GQM1500 |
| Inlet Temperature (°C) | >100 | ||||||||
| Outlet Temperature (°C) | >70 | ||||||||
| Moisture Evaporation (kg/h) | 100 | 150 | 200 | 300 | 400 | 500 | 600 | 800 | 1500 |
| Heat Source Type | Incremental single-engine intelligent electricity, incremental high-efficiency steam heat exchanger, incremental natural gas hot air furnace, incremental coal-fired hot air furnace, incremental biomass pellet hot air furnace | ||||||||
| Equipment Material | Carbon steel, stainless steel | ||||||||
| Floor Space and Power | Varies depending on the material and heating method | ||||||||
Engineering Process Flow Diagram
Previous： Vacuum Freeze Dryer
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