Overview of pressure spray dryer
The pressure spray dryer is a device that can complete drying and granulation at the same time. The raw material liquid can be a solution, emulsion, or suspension, as well as a melt or paste. Dried products can be made into powder, granules, hollow spheres, or pellets as needed. 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.

 
Working principle of pressure spray dryer
The solution, emulsion, suspension or slurry is spray in hot air to form small droplets. During its floating down, the water is evaporated to form powder or granular products. Hot air is introduced at the top of the drying tower, and the material liquid is pumped to the top of the tower by a high-pressure pump. After being sprayed into mist like droplets by an atomizer, the droplets quickly evaporate when they come into contact with high-temperature hot air, and become dried products in a very short time, which are discharged from the bottom of the drying tower. After the hot air comes into contact with the droplets, the temperature significantly decreases and the humidity increases. It is extracted as exhaust gas by the exhaust fan, and the micro powder carried in the exhaust gas is recovered by the separation device.
There are different options for micro powder separation and recovery devices, such as cyclone separators (ordinary and various combination types), bag filters, cyclone separators+bag filters, cyclone separators+wet dust collectors, bag filters+wet dust collectors, etc. We can provide different recycling devices based on the characteristics of different products and customer requirements.
According to different product characteristics and requirements, after spray drying, a secondary drying system (such as ZLG vibrating fluidized bed or air flow conveying), a dehumidification system, a batching system, or a powder screening system can be equipped. If the customer requires larger particles of the product, such as a diameter of 2-3 millimeters and increased solubility, our company can provide a separate agglomeration granulation system.

Process Flow Diagram of Pressure spray Dryer

Technical features of pressure spray dryer
1. The drying speed is fast, and the surface area of the material liquid is greatly increased after atomization. In the hot air flow, 95-98% of the moisture can be evaporated instantly, and the drying time is only tens of seconds to tens of seconds, which is particularly suitable for drying heat sensitive materials.
2. The obtained product is spherical particles with uniform particle size, good flowability, good solubility, high purity, and good quality.
3. Widely applicable, according to the characteristics of the material, it can be dried with hot air or granulated with cold air, with strong adaptability to the material.
4. Simple and stable operation, convenient control, and easy implementation of automated tasks.
5. The production process of spray dryer is simplified, and the operation and control are convenient. For liquids with a moisture content of 40-60% (up to 90% for special materials), they can be dried into powder products in one go without the need for crushing and screening, reducing production processes and improving product purity. The particle size, bulk density, and moisture content of the product can be adjusted within a certain range by changing the operating conditions, making control and management very convenient.

Application range of pressure spray dryer
Food industry: whole milk powder, whey protein, cocoa milk powder, milk replacer powder, egg white (yellow), etc. Oats, chicken juice, coffee, instant tea, spice meat, protein, soybean, peanut protein, protein hydrolysate, etc. Corn syrup, corn starch, glucose, pectin, maltose, potassium sorbate, pumpkin powder, etc.
Pharmaceutical products: Chinese herbal extracts, medicinal gels, yeast, vitamins, antibiotics, amylase, lipase, etc.
Plastic resin: AB, ABS lotion, urea formaldehyde resin, phenolic resin, sealant (urea) formaldehyde resin, polyethylene, PVC, etc.
Detergents: premium laundry detergent, regular laundry detergent, soap powder, baking soda, emulsifiers, whitening agents, phosphoric acid agents, etc.
Chemical industry: Sodium fluoride (potassium), alkaline dyes and pigments, dye intermediates Mn3o4、 Formaldehyde silicate, catalyst, sulfuric acid agent, amino acid, white carbon black, etc.
Ceramics: alumina, ceramic tile materials, magnesium oxide, talc, etc.

Technical specifications of pressure spray dryer

Note: 1. The nominal water evaporation rate is calculated based on an inlet temperature of 350 degrees Celsius and an exhaust temperature of 85-90 degrees Celsius;
2. We can provide various product recycling devices based on customer requirements and product characteristics to ensure the yield of products meets customer requirements;
3. Our company has advanced prototypes among domestic peers, which can be used to conduct various tests for customers to ensure that the equipment meets their requirements;
4. Our company's equipment and related parameter design have taken into account both production requirements and energy-saving requirements. For the same specifications of production, our company can provide more energy-efficient designs and products.

Ordering Instructions for Pressure spray Dryer
1. Name and properties of liquid materials: solid content (or water content), viscosity, surface tension, pH value, etc;
2. Product features: powder capacity after drying, allowable residual moisture content, particle size range, allowable high temperature;
3. Special requirements (if any): specific gravity range, color, fragrance, etc;
4. Production volume and daily shift schedule;
5. Available energy sources: steam pressure, electricity, coal, oil, natural gas, liquefied gas, and various other combustibles;
6. Control requirements: Control methods for inlet and outlet air temperature, liquid supply system, air hammer, etc., as well as control methods for the system;
7. Material receiving requirements: Select cyclone type, bag filter, wet dust collector and other methods according to product characteristics and environmental requirements;
8. Other special requirements, such as workshop size, height restrictions, and special electrical specifications;
Note: Customers can provide a portion of the above requirements based on their actual situation. Other requirements can be determined after conducting experiments or through consultation with clients based on experience.