Hollow paddle dryer

Description of Hollow paddle dryer

The hollow shaft of the paddle dryer is densely arranged with wedge-shaped hollow blades. The heat medium flows through the blades by the hollow shaft to heat the blades. The material advances in the vessel at a uniform speed due to the design angle of the blades and absorbs the heat from the wall of the blade. The moisture is evaporated and pumped away by the draught fan.
The effective heat transferring area per unit volume is big, heat medium temperature from -40ºC to 320ºC, can be water vapor, may also be liquid -type: such as water, oil and so on.
It is Indirect conduction heating, no air take away the heat, high heating efficiency, the only heating loss just be radiating through insulation layer. Wedged surface can clear itself, the relate movement between the material particle and wedged surface will occur scrub, so in operation can maintain a clean heat transfer surfaces.
The shell of paddle dryer is Ω-shape, normally there are 2 to 4 hollow mixing shafts. There is sealing end plate and cover, can avoid the dust leakage to ensure the best heat transfer.

Features of Hollow paddle dryer

1) Low energy consumption: As a result of indirect heating, no much air take away the heating, the outer wall has insulation layer, the heat efficiency can be up to 90%. For slurry, evaporating 1kg of water just need 1.2kg vapor.
2) cheap investment: it has huge effective heat transfer surface area per unit, reduce treatment time, let the machine size become small, so It greatly reduces the construction area and building space.
3) wide range of materials handling: can use different types of media, not only can treat heat-sensitive materials, but also handle high-temperature materials. Common medias are: water vapor, thermal oil, hot water, cooling water and so on.
4) flexible operation method: Can be continuous operation or intermittent operation, can be applied in many fields.
5)Low environmental pollution:  don't use air to dry material, dust material entrainment is rare. Small solvent evaporation, easy to treat. For contaminated materials or solvent recovery conditions, closed-loop can be used.
6)Cheap operating costs: Low-speed mixing and reasonable structure, Low wear, low maintenance costs. For normal operation, just only 1 person / day.
7)Stable operation: Due to the special compression-expansion stirring of the wedge blades, the material particle contact with the heat transfer surface enough, it ensure the processing is stable.
 

Application materials of hollow paddle dryer

Environmental protection industry: Sewage sludge, activated sludge, food sludge, oily sludge, textile dyeing sludge, chemical sludge, electroplating sludge, offscum of pharmaceutical factory, offscum of sugar factory, offscum of aginomoto factory, coal ash.

Organic fertilizer industry: Chicken manure, duck manure, pig manure, cow dung and so on.

Petrochemical industry: Polyolefin powder, high and low density polyethylene, linear low density polyethylene, polyacetal powder, nylon 6, nylon 66, nylon 12, cellulose acetate fiber, polyphenylene sulfide, allyl resin, engineering plastics, PVC, PVA, polrvinyl benzene, polypropylene, polyester, polyformaldehyde, styrene~acrylonitrile copolymerization, ethylene~propylene copolymerization

 Feedstuff industry: Soy sauce offscum, bone matrix feed, distillers’ grains, heels of foodstuff, apple pomace, orange skin, bean pulp, chicken bone feed, fish powder, feed additive and chemical sludge.

Foodstuff industry: Starch, cocoa bean, niblet,

Chemical industry: Lithium Iron Phosphate, Sodium carbonate, NPK compound fertilizer, kaolin, bentonite, carbon-white, conductex, phosphogypsum, oxidation sodium fluoride, lime nitrate, magnesium carbonate, sodium cyanide, calmogastrin, barium sulfate, annaline, calcium carbonate, dyestuff, molecular sieve, saponin.

Technical parameters of hollow paddle dryer