Hollow blade dryer
Summary:
Hollow blade dryer can indirectly heat or cool paste, granule, powder, paste material, can complete drying, cooling, heating, sterilization, reaction, low temperature calcining and other unit operations. The special wedge-shaped stirrer heat transfer blade in the equipment has higher heat transfer efficiency and self-cleaning function of heat transfer surface. It is a continuous energy-saving drying equipment. The hollow shaft is densely arranged with wedge-shaped hollow blades through which the hot medium flows. The heat transfer area within a unit effective volume is very large. The temperature of the hot medium ranges from -40℃ to 320℃. It can be water vapor or liquid, such as hot water and heat conduction oil. Indirect conduction heating, no air carrying away heat, heat is used to heat the material. The heat loss is only the heat dissipation to the environment through the body insulation layer. The heat transfer surface of wedge blade has self-cleaning function. The relative movement of the material particles and the wedge surface produces a washing effect, which can wash off the attached material on the wedge surface and keep the clean heat transfer surface during operation. The shell of the blade dryer is W type, two to four hollow stirring shafts are generally arranged in the shell. The shell has a sealed end cover and top cover to prevent the material dust from leaking and to collect the material solvent. A baffle lever is set at the outlet to ensure the height of the material, so that the heat transfer surface is covered by the material and give full play to its effect. The heat transfer medium flows through the shell jacket and the hollow stirring shaft through the rotating joint. The hollow stirring shaft has different internal structure according to the type of hot medium, so as to ensure the good heat transfer effect.
Application:
Petrochemical industry: polyolefin powder, polycarbonate resin, high and low density polyethylene, linear low density polyethylene, polyacetal particles, nylon 6, nylon 66, nylon 12, polyphenylene sulfide (PPS), allyl acetate, resin, polypropylene, engineering plastics, PVC, polyvinyl alcohol, polystyrene, polyester, polyformaldehyde, styrene - acrylonitrile copolymer and ethylene - propylene copolymer.
Environmental protection industry: sludge, electroplating sewage sludge, boiler soot, sugar factory waste residue, pharmaceutical factory waste residue, gourmet factory waste residue, coal ash.
Feed industry: soy sauce dregs, bone based feed, distiller's grains, food undercutting, apple dregs, orange peel, soybean meal, chicken bone feed, fish meal, feed additives, biological residue mud.
Food industry: starch, cocoa beans, corn kernels, salt, modified starch, medicine.
Chemical industry: soda ash, nitro phosphate potassium compound fertilizer, kaolin, bentonite, white carbon black, carbon black, phosphogypsum, calcium sulfate, calcium nitrate, magnesium carbonate, sodium cyanide, sodium fluoride oxide, alumina, barium sulfate, calcium carbonate, molecular sieve, dye, saponin.
Features:
Large heat transfer area, compact structure and small floor space.
High utilization of heat energy and low energy consumption, the charging amount can reach 70~80% of the volume of the cylinder. Due to indirect heating, there is no large amount of air to take away the heat. The outer wall of the dryer is also equipped with insulation layer, and only 1.2kg water vapor is needed to evaporate 1kg water.
Wedge - shaped blade has self - cleaning ability, which can improve blade heat transfer.
Wide applicability of materials, using different thermal media, can be treated thermal sensitive materials, but also can deal with high temperature drying materials. Common media are: steam, heat conduction oil, hot water, cooling water and so on. It can be operated continuously or intermittently and can be used in many fields.
Stable operation, uniform product drying. Due to the special expansion and stirring effect of the wedge blade, the material is in full contact with the heat transfer surface, so that the temperature, humidity and mixing gradient of the material in the axial range are very small, ensuring the stability of the process.
Low operating cost, only 1 person is needed for normal operation of the equipment, low speed mixing and reasonable structure. Low wear and tear, low maintenance costs.
