Descriptions

Continuous Hollow Paddle dryer is a dryer that allows materials (organic, inorganic particles or powder material) to be directly contacted with a rotating hollow wedge-type heating part for heat transfer. It does not require air as a heating medium, the air used is only a carrier to take vapor out

Principle of work

♦ Paddle type dryer is a kind of heat conduction-based horizontal mixing dryer, the main structure is a jacketed W-shaped shell with a pair inside low-speed rotating hollow shaft, the shaft is welding a number of hollow mixing blade, jacket and hollow stirrer are passed through heat medium, and the two heating surfaces dry materials at same time. Therefore, the machine has a prominent heat transfer rate than general conduction dryer. Biaxial or multi-axis type can be designed according to actual needs.
♦ The hot air is usually fed from the middle of dryer and discharged from the other side through the surface of material layer in the agitated state. Heating medium can be steam, hot water, or high temperature heat transfer oil.

Features

♦ Typical conduction drying method and high thermal efficiency, it saves 30% to 60% or more than the usual convection drying energy.
♦ As there is steam into stirring paddles too, the dryer has bigger unit volume heat transfer area than normal indirect heat transfer dryer.
♦ The hollow wedge paddles rotate in opposite directions, and the two slopes of the blades are repeatedly agitated, compressed, relaxed and pushed forward materials. This opposite movement gives the foliage a unique self-cleaning effect, and the heating surface is constantly updated to keep heating coefficient higher than any other conduction drying methods.
♦ As the heating surface has a unique self-cleaning effect, it can successfully deal with most of high water or viscous paste materials, the scope of application is wider than general conduction drying equipment.
♦ As all required heat is offered by the hollow paddle and jacket, in order to reduce exhaust humidity, only a small amount of hot air will be added, dust entrainment is very little and exhaust treatment is easier.
♦ Material retention time is easy to adjust, it can handle high water content, and get final product with very low water content.
♦ Dryer stock material volume is very high which is about 70 - 80% of cylinder volume, the effective heating area of unit is much higher than general conductive drying equipment, the machine is compact with small size and small occupation.
♦ It can be easily combined with other drying methods to make efficient drying uints, to play their respective advantages, achieve best economic and technical indicators. Such as paddle-plate dryers combination to improve the integrated drying efficient, paddle-steam rotary drum dryers combination to deal with largely of high moisture or sticky material continuously.
♦ It can be operated under vacuum state, to recover solvent and to complete evaporation of the volatile material with high boiling point.

Adaptive material

♦ Inorganic chemical industry: nano-superfine calcium carbonate, calcium ink, paper calcium, toothpaste calcium, magnesium carbonate containing calcium carbonate, light calcium carbonate, wet active calcium carbonate, magnesium carbonate, magnesium oxide, magnesium hydroxide, phosphogypsum Calcium, calcium sulfate, kaolin, barium carbonate, potassium carbonate, iron black, iron yellow, iron green, iron red，soda ash, NPK compound fertilizer, bentonite, white carbon black, carbon black, sodium fluoride, sodium cyanide ， Aluminum hydroxide, pseudo-water aluminum, molecular sieves, saponin, cobalt carbonate, cobalt sulfate, cobalt oxalate and so on.
♦ Organic Chemical Industry: Indigo, Dye Organic Red, Dye Organic Yellow, Dye Organic Green, Dye Organic Black, Polyolefin Powder, Polycarbonate Resin, High (Low) Density Polyethylene, Linear Low Density Polyethylene, Polyacetal Granules, nylon 6，nylon 66, nylon 12，acetate fiber, polyphenylene sulfide, propylene-based resin, engineering plastics, polyvinyl chloride, polyvinyl alcohol，polystyrene, polypropylene, polyester, Acrylonitrile copolymerization, ethylene-propylene copolymerization, and the like.
♦ Smelting industry: nickel concentrate powder, sulfur concentrate powder, copper concentrate powder, zinc concentrate powder, gold anode mud, silver anode mud, DM accelerator, tar off the phenol and so on.
♦ Environmental protection industry: urban sewage sludge, industrial sludge, PTA sludge, electroplating sewage sludge, boiler soot, pharmaceutical waste, sugar residue, monosodium glutamate plant waste, coal ash and so on.
♦ Feed industry: soy sauce residue, bone feed, lees, food under the material, apple pomace, orange peel, soybean meal, chicken bone feed, fish meal, feed additives, biological slag and so on.
♦ Food, medical industry: starch, cocoa beans, corn kernels, salt, modified starch, drugs, fungicides, protein, avermectin, medicinal aluminum hydroxide, penicillin intermediates, Deng salt, caffeine.

Schematic of stracture

Technical parameters