Pressure spray dryer comprehensive technical documentation

1. Equipment overview and principle

Pressure spray dryer is an efficient and continuous solid material drying equipment, which is widely used in pharmaceutical, food, chemical, ceramics and other industries. It atomizes liquid materials through high pressure into tiny droplets, which quickly evaporate water in hot air to form dry product particles. The equipment has the advantages of large processing capacity, fast drying speed and uniform product quality, and has become an indispensable important equipment in modern industrial production.

The working principle of the pressure spray dryer is based on the pressure pump to send the liquid material into the spray system, and the material is atomized into droplets with a diameter of about tens of microns under high pressure through a special nozzle (usually a high-pressure centrifugal or pressure nozzle). At the same time, after the hot air is heated by the heater to the set temperature, it enters the drying chamber and exchanges heat and mass with the atomized droplets, so that the water in the droplets quickly evaporates and forms dry solid particles. The dried product enters the collection system with the air flow, while the exhaust gas is treated and discharged.

2. Main structure and material

The pressure spray dryer is mainly composed of feeding system, spray system, drying chamber, hot air system, tail gas treatment system, collection system, automatic control system and safety protection system. Among them, the drying chamber is the core component, in cylindrical or conical design, with an internal air distribution device to ensure the uniform distribution of hot air.

- ** Drying chamber ** : Generally made of stainless steel (such as 304 or 316L) to resist corrosion and high temperature, and ensure the health and safety of the product.

- ** Nozzle ** : The selection of high hardness, wear resistant alloy material, to withstand high pressure injection and not easy to damage.

- ** Hot air system ** : The heater is usually heated by electric or steam heating, and the material is high temperature resistant alloy or stainless steel.

- ** Pipes and valves ** : All are made of corrosion-resistant and heat-resistant stainless steel to ensure stable operation of the system.

3. Spray system design

The spray system is the key part of the pressure spray dryer, and its design directly affects the particle size distribution and drying efficiency of the product. The system includes high pressure pump, nozzle, pipeline and regulating device. The nozzle is precision machined to ensure that the droplets are uniform and fine. By adjusting the pressure of the pump and the structure of the nozzle, the size of the droplet and the spray Angle can be controlled to adapt to the drying needs of different materials.

4. Drying room and temperature control

The drying room is equipped with temperature sensor and hot air distribution device to ensure the uniform flow of hot air in the drying room, while monitoring and controlling the indoor temperature in real time. Through PID temperature controller, the output power of the heater is precisely adjusted, so that the temperature in the drying room is maintained within the set process range to ensure the drying quality and drying efficiency of the product.

5. Exhaust gas treatment and environmental protection

The exhaust gas treatment system is mainly used to remove dust and harmful gases in the exhaust gas to meet environmental protection emission standards. Common treatment methods include bag dust removal, wet dust removal, electrostatic dust removal, etc. At the same time, for the exhaust gas containing organic solvents, it is also necessary to use adsorption, condensation or incineration methods for treatment. The system is equipped with automatic monitoring device, real-time monitoring of exhaust emission indicators, to ensure environmental protection standards.

6. Automatic control and monitoring system

The pressure spray dryer is equipped with advanced PLC automatic control system, which can realize the automatic control of the entire drying process. The system has man-machine interaction through touch screen or computer interface, which is convenient for users to set process parameters, monitor running status, record production data, etc. At the same time, the system also has fault self-diagnosis, alarm and safety protection functions to ensure the safe and stable operation of the equipment.

7. Security protection and alarm

In order to ensure the safe operation of the equipment, the pressure spray dryer is equipped with a variety of safety protection devices and alarm systems. Including overheating protection, overpressure protection, lack of material alarm, motor overload protection and so on. When the equipment is abnormal, the system will automatically cut off the relevant power supply or send an audible and visual alarm signal to remind the operator to deal with it in time.

8. Maintenance and maintenance guide

** Daily Maintenance ** :

- Regular cleaning of exhaust gas treatment system to ensure emission standards.

** Regular maintenance ** :

- Conduct a thorough inspection of the entire system to detect and deal with potential failures in a timely manner.