1. Brief introduction of centrifugal two-fluid dual-use spray dryer equipment for pharmaceuticals
This spray dryer is composed of seven systems, namely, feed system, atomization system, drying tower, material recovery system, heating system, piping system and control system.
Centrifugal two-fluid dual-purpose spray drying unit for pharmaceuticals
1 Introduction to equipment principle
The spray dryer is a drying equipment for processing solutions, suspensions or slurry-like materials. The basic process is that the material liquid passes through the atomizer to form mist droplets and dispersed in the hot air flow. The air is sent to the air heater through the blower for preheating, and then enters the spray dryer, where it is dried in contact with the droplets. Part of the product falls into the bottom of the tower and is separated from the gas, and the other part is sucked into the cyclone separator by the induced draft fan and the tail gas is emptied after separation. The centrifugal spray dryer mainly uses the high-speed rotation force of the rotary atomizer to throw out the droplets.
The airflow spray dryer is named after the airflow atomizer. The working principle of the airflow atomizer is to use high-speed
The air flow causes the liquid film to split. Compressed air is used for high-speed airflow. The flow rate of the material liquid is very low, when the compressed air
When the gap velocity is ejected from the atomizer, there is a large velocity difference between the two, causing friction and shear force between the gas and liquid. The liquid is drawn into long slender filaments in an instant, and these filaments quickly break at the thinner parts to form tiny droplets.
The centrifugal spray dryer mainly uses the high-speed rotation force of the rotary atomizer to throw out the droplets, which are also dried by hot air and become powder or granules.
This spray dryer is a centrifugal and airflow dual-purpose type. When the experiment requires powder, the airflow type is used. The airflow type has a long service life and is not easy to damage. At the same time, this is also the disadvantage of the centrifugal atomizer. When the experiment requires uniform powder or particles Choose centrifugal atomization system for spray drying.
2. The overall structure of the equipment (subject to the final design of the supplier)
3. Feeding system
The feeding system consists of a peristaltic pump peristaltic tube.
4. Atomization system
The atomization system adopts a centrifugal atomizer. The pump sends the material liquid into the atomizer, and the high-speed air flow from the nozzle annular gap atomizes the material liquid, and the droplet size can be adjusted by changing the gas-liquid ratio.
5. Drying tower
The drying tower is mainly composed of tower body, cone bottom, volute, gas distributor, temperature sensor, etc., according to the moisture
Design atomization radius, residence time and processing air volume for evaporation capacity and material properties. In order to avoid material splashing during reclaiming,
The drying tower is operated with slight negative pressure. The upper part of the drying tower is a hot air inlet, equipped with a volute and a hot air distributor. The hot air is evenly distributed through the hot air distributor and exchanges heat evenly and effectively with the droplets to dry the droplets into a dry powder product. The temperature sensor is used to record the inlet air temperature and the outlet air temperature.
6. Material recovery system
The material recovery system consists of a cyclone separator and a bag filter. After drying, the gas carrying dust enters the cyclone separator, and the gas-solid separation is carried out by the cyclone. The powder enters the barrel and the gas is discharged upward through the air outlet and enters the bag filter. The bag method can effectively recover the trace ultrafine powder in the gas.
7. Heating system The heating system consists of air filter, blower and explosion-proof electric heater.
8. Piping system The piping system consists of induced draft fans and stainless steel pipes.
9. Control system Take programmable controller as the center, control each important function device and fault alarm: there are two modes of automatic and manual control.
2. Parameters of a centrifugal two-fluid dual-purpose spray drying unit for pharmaceuticals:
Internal diameter of tower: Φ800mm
Ø Outer diameter of tower body: Φ1000mm
ØInduced air volume: 600 m³/h
Ø Inlet air temperature: 110-250°C
Ø Outlet temperature: 80-95°C.
Ø Water evaporation capacity: 5 kg/h (at 250 degrees)
Ø Solid content: it depends on the material
Ø Heat source: electric heating
ØReceiving method: bag dust removal, tower bottom, cyclone three-point collection.
ØBag material: Toray, PTFE folded filter element
ØAtomization method: A: Centrifugal (electric type, 24000RPM, adjustable speed, adjustable atomizer frequency converter) B: Airflow dual-purpose type (airflow atomization, air pressure adjustable 0.2MBA)
ØWhether with bag dust removal system: included
