A vacuum dryer utilizes vacuum to reduce the moisture vapor pressure in the space and increase the mass transfer driving force, thereby accelerating the drying process and enabling materials to dry at lower temperatures. It is suitable for drying heat sensitive, moisture sensitive, and easily oxidizable materials, or for situations where harmful gases are prone to occur during operation. It is a commonly used drying equipment in chemical and pharmaceutical industries,
1、 Single cone vacuum dryer
The single cone vacuum dryer is a rotary tank with a single cone shape. When the tank is in a vacuum state, steam or hot water is introduced into the jacket for heating. The heat comes into contact with the wet material through the inner wall of the tank, and the water vapor evaporated by the wet material after absorbing heat is pumped out through the vacuum exhaust pipe by the vacuum pump. Due to the vacuum state inside the tank, and the rotation of the tank causing the material to constantly flip up and down, inside and outside, the drying speed of the material is accelerated, the drying efficiency is improved, and the goal of uniform drying is achieved.
2、 Double cone rotary vacuum dryer
The double cone rotary vacuum dryer is a new type of dryer that integrates mixing and drying. It consists of a condenser, vacuum pump, and dryer to form a vacuum drying device. If solvent recovery is not required, the condenser can be omitted. The internal structure is simple, easy to clean, all materials can be discharged, and the operation is simple. This device can reduce labor intensity and improve the working environment. At the same time, due to the rotation of the container itself, the material also rotates but no material accumulates on the container, resulting in a high heat transfer coefficient and fast drying speed. This not only saves energy, but also ensures uniform and sufficient drying of the material, resulting in good quality. It can be widely used for drying materials in industries such as pharmaceuticals, chemicals, food, dyes, etc. Meets the requirements of Good Manufacturing Practice (GMP) for drug management.
The double cone rotary vacuum dryer is a double cone rotary tank body. When the tank is in a vacuum state, steam or hot water is introduced into the jacket for heating. The heat comes into contact with the wet material through the inner wall of the tank body, and the water vapor evaporated by the wet material after absorbing heat is extracted by a vacuum pump through a vacuum exhaust pipe. Due to the vacuum state inside the tank and the continuous flipping of the material inside and outside caused by the rotation of the tank, the drying speed of the material is accelerated, the drying efficiency is improved, and the goal of uniform drying is achieved.
3、 Square/circular vacuum dryer
Square/circular vacuum dryer is a method of heating and drying dry materials under vacuum conditions. If a vacuum pump is used for air and moisture extraction, the drying speed is accelerated.
Note: If a condenser is used, the solvent in the material can be recovered through the condenser. If the solvent is water, the condenser can be omitted to save energy investment.
characteristic
◎ The boiling point of the material solution decreases under vacuum, which increases the heat transfer driving force of the evaporator. Therefore, a certain amount of heat transfer can save the heat transfer area of the evaporator.
◎ The heat source for evaporation operation can be low-pressure steam or waste heat steam.
◎ The evaporator has less heat loss.
◎ Before drying, disinfection treatment can be carried out, and there is no impurity contamination during the drying process, which meets GMP requirements.
◎ It belongs to a static vacuum dryer, so the shape of the dried material will not be damaged.
4、 Rake type vacuum dryer
The rake type vacuum dryer has a simple structure, easy operation, long service life, stable and reliable performance, low steam consumption, strong applicability, and good product quality. It is particularly suitable for drying paste like materials that are not resistant to high temperatures, flammable, and prone to oxidation under temperature regulation
1. Closed dry environment with no dust flying, equipped with corresponding auxiliary equipment to ensure no dust flying in the workspace
2. The machine is equipped with agitation to create a continuous circulation of materials inside the cylinder, further improving the uniformity of material heating.
3. Suitable for all materials that require vacuum drying (except for materials that require surface smoothness of particles).
4. This machine is equipped with agitation to facilitate the smooth drying of slurry, paste, and paste like materials.
5. Corresponding variant equipment can be selected according to the process requirements.
5、 Spray dryer
Spray dryer is divided into high-speed centrifugal spray dryer, pressure spray dryer and spray dryer for Chinese herbal extracts. spray dryer is a device that can complete drying and granulation at the same time. According to the process requirements, the pressure, flow rate, and nozzle size of the material liquid pump can be adjusted to obtain the required spherical particles in a certain size ratio. The spray dryer is filtered and heated by air and enters the air distributor at the top of the dryer. The hot air enters the drying chamber in a spiral shape. The feed liquid passes through the high-speed centrifugal atomizer on the top of the tower body, and (rotating) spray into extremely fine mist like liquid beads, which can be dried into finished products in a very short time in parallel with hot air. The finished product is continuously output from the bottom of the drying tower and the cyclone separator, and the exhaust gas is discharged by the induced draft fan.
6、 Boiling dryer
Boiling dryer is a type of drying equipment, also known as fluidized bed, generally composed of a heater, boiling bed host, cyclone separator, bag filter, induced draft fan, and control panel. According to the different properties of the materials, cyclone separators or bag filters can be selected as needed.
Boiling dryer uses air heated by a heat exchanger to form hot air that is distributed into the main unit through a valve plate. Wet materials enter the dryer from the feeder. Due to the effect of air pressure, the materials form a boiling state in the dryer and come into extensive contact with hot air, thus completing material drying in a relatively short time.
7、 Paddle dryer
Wedge shaped hollow blades are densely arranged on the hollow shaft, and the heat medium flows through the blades through the hollow shaft. The heat transfer area within a unit effective volume is large, and the temperature of the heat medium ranges from -40 to 320 ° C. It can be water vapor or liquid, such as hot water, heat transfer oil, etc. Indirectly transferring heat without carrying air to take away heat, the heat is used to heat the material, and the heat loss is only due to the heat dissipation to the environment through the insulation layer of the device. The wedge-shaped blade heat transfer surface has a self-cleaning function, and the relative motion between material particles and the wedge-shaped surface produces a washing effect, which can wash away the attachments on the wedge-shaped surface and maintain a clean heat transfer surface during trial operation.
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 material is heated and dried by conduction heating. The dried material is quantitatively and continuously fed into the feeding port of the dryer by the screw feeder. The material enters behind the dryer and is flipped and stirred by the rotation of the blade, constantly updating the heating interface. It comes into contact with the body and blade and is fully heated, causing the surface moisture contained in the material to evaporate. At the same time, the material 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. The qualified products with uniform drying are discharged from the discharge port.
Changzhou Binda Drying and Granulation Equipment Co., Ltd. specializes in designing and producing various types of drying equipment, mixing equipment, crushing equipment, granulation equipment, dust removal equipment, etc. If you have technical needs, please feel free to discuss with us in detail!
