Hollow shafts are densely arranged with wedge-shaped hollow blades, and the heat medium flows through the blades through the hollow shaft. There is a large area of â€‹â€‹heat transfer within the unit's effective volume. The temperature of the heat medium ranges from -40Â°C to 320Â°C. It can be water vapor or liquid type: such as hot water, heat transfer oil, etc. Indirect conductive heating, without carrying air to take away heat, heat is used to heat the material. The heat loss is only through the body heat insulation layer to the environment. The wedge blade heat transfer surface has a self-cleaning function. The relative motion of the material particles and the wedge-shaped surface creates a scrubbing action that can wash away the adhered material on the wedge surface so that a clean heat transfer surface is maintained during operation. The paddle dryer has a W-shaped shell, and two to four hollow stirring shafts are generally arranged in the shell. The shell has a sealed end cap and an upper lid to prevent the material dust from leaking out and collecting the solvent vapors of the material. A baffle is set at the discharge port to ensure the material height, so that the heat transfer surface is covered by the material and fully play its role. The heat transfer medium passes through the rotary joint and flows through the housing jacket and the hollow agitation shaft. The hollow agitation shaft has different internal structures according to the type of the heat medium to ensure the best heat transfer effect.
1. Low energy consumption of paddle dryer: Due to indirect heating, there is no large amount of air to carry away heat, and the outer wall of the dryer is provided with insulation layer. For slurry materials, only 1 kg of water vapor is required to evaporate 1 kg of water.
2, the blade dryer system cost is low: the effective volume of the unit has a huge heat transfer surface, to shorten the processing time, equipment size becomes smaller. It has greatly reduced the construction area and the construction space.
3, processing a wide range of materials: the use of different heat media, can handle heat-sensitive materials, but also can handle high-temperature processing of materials. Commonly used media are: water vapor, thermal oil, hot water, cooling water and so on. Both continuous and intermittent operation can be applied in many fields.
4. Small environmental pollution: Do not use carry air, dust material is very little entrainment. The solvent evaporation volume is very small and it is easy to handle. Closed-circuit circulation may be used for contaminated materials or conditions where solvents are to be recovered.
5, operating costs are low: the normal operation of the device, only 1 hour / day Â· people. Low speed stirring and reasonable structure. The amount of wear is small and maintenance costs are low.
6. Stable operation: Due to the special compression-expansion stirring action of the wedge-shaped paddle, the material particles are fully in contact with the heat transfer surface. In the axial interval, the gradient of the temperature, humidity and mixing degree of the material is very small, thus ensuring the The stability of the process.
Field of use
Paddle dryer has been successfully used in food, chemical, petrochemical, dye, industrial sludge and other fields. The heat transfer, cooling, and stirring characteristics of the equipment allow it to perform the following unit operations: calcination (low temperature), cooling, drying (solvent recovery), heating (melting), reaction and sterilization. The stirring blade is also a heat transfer surface, which increases the heat transfer area in the effective volume of the unit and shortens the processing time. The wedge blade heat transfer surface also has a self-cleaning function. Compression-expanding stirring function makes the materials mixed evenly. The material moves in the axial direction as "plug flow". In the axial interval, the gradient of temperature, humidity and mixing degree of the material is very small.
1, using heat transfer oil as a heat medium, paddle dryer can complete the low temperature calcination work. Such as: calcium sulfate dihydrate (Ca2SO4 Â· 2H2O) calcined into calcium sulfate hemihydrate (Ca2SO4 Â· 1/2H2O). Sodium bicarbonate (NaHCO3) is converted into soda ash (Na2CO3) by calcination.
2, into the cooling medium, such as water, cooling brine, etc. can be used for cooling. Such as: used in the soda industry blade cooler, replace the old air-cooled cooling alkali machine, saving energy and tail gas processing equipment, reducing operating costs, can also be used for titanium dioxide, nickel-iron alloy powder and a variety of granular Material cooling. The material can be cooled from 1000Â°C to less than 40Â°C in a single machine.
3, Drying, the most important function of the equipment, not using hot air, so that solvent recovery, energy consumption, environmental control in an easy-to-handle ideal state. Particularly suitable for the recovery of solvents, flammable and easily oxidized heat-sensitive materials. Has been widely used in fine chemicals, petrochemicals, dyes industry.
4. In the axial section, the uniformity of temperature, humidity, and mixing degree allows the equipment to be used for heating or melting, or to react with some solid materials. It has been successfully used in the compound fertilizer and modified starch industries. Paddle dryers can be used to sterilize food and flour. The large heating area in the unit's effective volume quickly heats the material to the sterilization temperature, avoiding long-term heating and changing the material quality.
Adapt to the material
Petrochemical industry: polyolefin powder, polycarbonate resin, high and low density polyethylene, linear low density polyethylene, polyacetal particles, nylon 6, nylon 66, nylon 12, acetate, polyphenylene sulfide, propylene Based resins, engineering plastics, polyvinyl chloride, polyvinyl alcohol, polystyrene, polypropylene, polyester, polyoxymethylene, styrene-acrylonitrile copolymer, ethylene propylene copolymer.
Environmental protection industry: PTA sludge, electroplating sewage sludge, boiler soot, pharmaceutical factory waste residue, sugar factory waste residue, MSG waste residue, coal ash.
Feed industry: soy sauce residue, bone-based feed, distiller's grains, food waste, apple pomace, orange peel, soybean meal, chicken bone feed, fish meal, feed additives, biological sludge
Food industry: starch, cocoa beans, corn kernels, salt, modified starch, medicines.
Chemical industry: soda ash, NPK fertilizer, kaolin, bentonite, white carbon black, carbon black, phosphogypsum, sodium oxide oxide, calcium nitrate, magnesium carbonate, sodium cyanide, aluminum hydroxide, barium sulfate, calcium sulfate, Calcium carbonate, dyes, molecular sieves, saponins.
Aluminum Fan Blade Feature:
As you can see, cast aluminum is used in a number of different objects that most of us use on a daily basis. Why is it so popular and why do so many people use it? There are actually a dew reasons for the popularity.
As already mentioned, it is very strong and durable. It might not be as strong as cast iron, however, it is very close and certainly a type of metal that you can depend on when you need it the most. This is one reason that people choose this alloy, but they also like the cost. When compared to other metals, it is very cost effective. It can be purchased at a cost of about half of what you would spend on other types of metals and AL alloy.
This die cast type of aluminum is oftentimes used to produce many types of automobile parts. Additionally it is used to create many other products that people use each day. Even furniture can be created using this specific type of metal! Cookware is also commonly made of cast aluminum because it is so strong, patio furniture is also another place that cast aluminum is easy to find. It is a special type of metal alloy and before it can be used it has to go through what is called casting. This is a process that adds durability and strength to the material, as well as makes it more efficient for use. There are a few different ways that casting can occur, including through sand casting, die casting and mold casting. Die casting is usually the most popular method of casting.
Aluminum Fan Blade
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Zheke Mould Technology Co. Ltd. , https://www.zkdiecasting.com