fly ash rotary dryer

Fly ash dryers are primarily used to dry granular materials within a certain humidity range, such as yellow sand used in the dry mortar industry, various molding sands used in the foundry industry, blast furnace slag used in the building materials and cement industry, small-grained clay used in the chemical industry, and small-grained materials that are chemically stable and resistant to high temperatures and dust. Depending on the industry's requirements for the final moisture content of the dried material, the dried material can be reduced to below 1-0.5%.

[Feed Particle Size]: 200 mesh

[Processing Capacity]: 0.5-50 t/h

[Applications]: Industrial waste, metallurgy, building materials, insulation materials, coatings, and other industries

[Applicable Materials]: Power plant ash, pulverized coal, industrial waste, refractory materials, fly ash, perlite, dolomite, clay, etc.

Advantages

The fly ash dryer has a compact structure, simple construction, and reasonable layout, which improves the heat exchange rate between materials and heat energy, resulting in a good material drying effect; the basic investment is small, only half of the single-drum dryer with the same output, reducing one-time investment; it has reliable operation, low energy consumption, and high thermal efficiency; at the same time, it is easy to realize automatic control, reduce the number of operators, and save labor resources.

Principle of working

During the fly ash drying process, wet fly ash is conveyed by a belt conveyor into a drum-type disintegrating device. After rapidly disintegrating into lumps, it enters a negative pressure dryer and is divided into four working zones:

First, the material guide zone: The wet fly ash enters this zone and comes into contact with high-temperature, negative-pressure hot air, rapidly evaporating a significant amount of its moisture. The fly ash is then moved by the high-angle lifters, preventing it from clinging and being directed to the next working zone.

Second, the cleaning zone: The wet fly ash is lifted by lifters in this zone, forming a curtain. As the material falls, it tends to stick to the drum walls. The equipment features a cleaning device that quickly removes any fly ash that adheres to the drum walls. During this process, the cleaning device is very effective in removing any clinging fly ash. The pellets also break up agglomerates, increasing the heat exchange area, improving heat and mass transfer efficiency, and boosting the drying rate.

Third, the inclined lifting plate area: This is the low-temperature drying zone. The fly ash is already in a low-moisture, loose state here, free of any clumping. After heat exchange, the finished product reaches the required moisture content and moves to the final discharge area.

Fourth, the discharge area: No lifting plates are installed in this area for drying fly ash. Instead, the material rolls and slides to the discharge outlet, completing the drying process.

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