Principle

Hollow blade dryer is a low-speed stirring dryer with conduction heating. A jacket is installed on the dryer cylinder, and a hollow blade is installed on the hollow shaft. A heat carrier is introduced into it, and the wet material undergoes sufficient heat exchange between the cylinder and the blade surface under the stirring of the stirring blade, in order to achieve the purpose of drying.

Application

This machine is suitable for processing various materials with good thermal stability such as paste like and granular powders. Under special conditions, it can also dry heat sensitive materials and recover solvents during the drying process. Heating media can be steam, hot water, hot oil, etc. Typical dry materials include carbon black, calcium carbonate, gypsum, clay, nylon, and polyester slicesEthylene, polypropylene, etc.

FEATURES

Compact structure, large heat transfer area, small footprint, low air consumption during drying, low dust, blade interaction with self-cleaning function, long material retention time, and high filling coefficient.

A specialized hollow blade dryer designed for sludge drying in urban sewage treatment plants, printing and dyeing plants, paper mills, electroplating plants, thermal power plants, chemical plants, etc. Generally, the initial moisture content of sludge is around 50%~80%, and the final moisture content after drying is about 35%. The dried sludge can be mixed with coal powder and directly burned in a boiler. The calorific value of sludge is about 1500-2000kcal, which can save energy and be reused. Some sludge can also be made into fertilizers and building materials after drying, or directly buried without causing secondary pollution, turning waste into treasure and fully meeting environmental protection requirements.

The dryer uses steam, hot water, or thermal oil as the heating medium, and the shaft end is equipped with a rotating joint for introducing and exporting the heat medium. The heating medium is divided into two paths, which enter the jacket of the dryer body and the inner cavity of the blade shaft, respectively. The body and blade shaft are heated simultaneously, and the sludge is heated and dried by conduction heating. The dried sludge is quantitatively and continuously fed into the feeding port of the dryer by the screw feeder. The sludge enters behind the dryer and is flipped and stirred by the rotation of the blades, constantly updating the heating interface. It comes into contact with the body and blades and is fully heated, causing the surface moisture contained in the sludge to evaporate. At the same time, the sludge is transported in a spiral trajectory towards the discharge port with the rotation of the blade shaft, and continues to stir during transportation to evaporate the water seeping out of the sludge. ^Afterwards, the uniformly dried qualified products are discharged from the discharge outlet.

FEATURES

1. The equipment has a compact structure, with a large heat transfer area per unit volume and a small footprint;

2. The unit volume equipment has a large heat transfer area and high thermal efficiency, reaching 80-90% (evaporating 1kg of water consumes 1.1-1.3kg of steam);

3. The wedge-shaped blade has self-cleaning ability, which compresses and expands the material during rotation, enhancing the heat transfer effect;

4. The gas flow rate inside the dryer is low, resulting in less dust carried out by the gas. After drying, the recovery of gas and dust in the system is convenient, and the scale of tail gas treatment equipment can be reduced, saving equipment investment.