Pressure Spray Dryer

1.Equipment Overview and Principles

Equipment Overview：

Pressure spray dryer is an efficient and continuous solid material drying equipment, widely used in pharmaceutical, food, chemical, ceramic and other industries. It atomizes liquid materials into tiny droplets through high pressure, and these droplets evaporate water rapidly in hot air to form dry product particles. This equipment has become an indispensable and important equipment in modern industrial production for its advantages of large handling capacity, fast drying speed and even product quality.

Working Principle：

The working principle of the Pressure Spray Dryer is based on a pressure pump feeding the liquid material into the spray system.By means of special nozzles (usually high-pressure centrifugal or pressure nozzles) the material is atomized under high pressure into droplets with a diameter of about tens of microns.At the same time, the hot air is heated to the set temperature by the heater and then enters the drying chamber to exchange heat and mass with the atomized liquid droplets.Rapid evaporation of water from droplets to form dry solid particles.The dried product enters the collection system with the airflow, while the exhaust gas is treated and discharged.

2.Main structure and material

body structure：

Pressure spray dryer is mainly composed of feeding system, spraying system, drying chamber, hot air system, exhaust gas treatment system, collection system, automatic control system and safety protection system.Among them, the drying chamber is the core component, which adopts cylindrical or conical design, and is equipped with an internal airflow distribution device to ensure the uniform distribution of hot air.

Material Selection：

-drying chamber：Generally made of stainless steel (e.g. 304 or 316L) to resist corrosion and high temperature and to ensure the sanitary safety of the product.

-extrusion nozzle：High hardness, wear-resistant alloy materials are selected to withstand high-pressure injection without easy damage.

-Hot Air System：The heaters are often electrically heated or steam heated and are made of high temperature resistant alloy or stainless steel.

-Pipes and valves：All are made of corrosion-resistant, high-temperature-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 of the product and drying efficiency.The system consists of a high pressure pump, nozzles, piping and regulating devices.The nozzles are 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 droplet size and spray angle can be controlled to meet the drying needs of different materials.

4.Drying chambers and temperature control

The drying room is equipped with temperature sensors and hot air distribution devices to ensure that the hot air flows evenly in the drying room, while monitoring and controlling the room temperature in real time.Through the 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 products.

5.Exhaust treatment and environmental protection

The exhaust gas treatment system is mainly used to remove dust and harmful gases from the exhaust gas in order to meet the environmental emission standards.Common treatment methods include bag de-dusting, wet de-dusting, and electrostatic de-dusting.At the same time, exhaust gases containing organic solvents need to be treated by adsorption, condensation or incineration.The system is equipped with automatic monitoring devices to monitor tail gas emission indicators in real time to ensure that environmental protection standards are met.

6.Automatic control and monitoring systems

The pressure spray dryer is equipped with advanced PLC automatic control system, which can realize the automatic control of the whole drying process.The system carries out human-computer interaction through touch screen or computer interface, which is convenient for users to set process parameters, monitor operation status and record production data.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 & Alarms

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 an abnormal situation occurs in the equipment, the system will automatically cut off the relevant power supply or issue sound and light alarm signals to remind the operator to deal with it in time.

8.Maintenance and Care Guide

routine maintenance：

-Regularly check nozzle wear and replace damaged nozzles in a timely manner；

-Clean the drying chamber and piping of the accumulation of material and dust, keep the system clean；

-Check whether the connection parts are fastened to prevent air or material leakage；

-Regular cleaning of the exhaust gas treatment system to ensure that emissions meet standards.

regular maintenance：

-Lubricate and inspect key components such as high-pressure pumps, motors, etc. to ensure their normal operation；

-Calibration of temperature sensors, pressure gauges and other instruments to ensure accurate measurements；

-Perform a comprehensive check of the entire system to identify and address potential faults in a timely manner.

Following the above maintenance and care guidelines can extend the service life of the pressure spray dryer, improve equipment operating efficiency, and protect product quality and production safety.