Corn steep liquor spray dryer machine
Advantages of Corn steep liquor spray dryer machine:
1. The corn steep liquor spray dryer machine has a fast drying speed: the volume of the material liquid is increased thousands of times after being atomized by the atomizer, and the moisture of 90%~95% can be achieved in an instant when the small droplets are in contact with the hot air The evaporation capacity, according to the difference of different forms of equipment, the drying time can be controlled within 5-20 seconds, and the drying process is very fast.
2. The material does not withstand high temperature and is suitable for the drying of heat-sensitive materials: In the spray drying process, the material is in direct contact with hot air, but most of the heat is used to evaporate the moisture in the material liquid, and the temperature of the material will not exceed the high temperature air Wet bulb temperature, the quality of the material will not be affected by the high temperature air, and it is suitable for drying heat sensitive materials such as medicine.
3. Used in the production of a variety of products ranging from high-grade synthetics to bulk chemicals. Spray drying technology is very suitable for the drying of materials with a solid content of 0-60%. By changing the process parameters, it can be produced in a very efficient manner that meets the powder size and shape, density, dispersion, polymorphism and flow characteristics Complex powders with precise powder characteristics.
The spray drying technology consists of three parts. The first part is to atomize the material liquid, the second part is to make the atomized material liquid contact with the air, and the third part is to separate the dried powder from the air.
The influence of Corn steep liquor spray dryer machine operating parameters on product properties (the product properties referred to here mainly refer to particle size and bulk density) are as follows.
1. The influence of the feed rate: Under constant atomization and drying operating conditions, the particle size and bulk density of the dried product increase with the increase of the feed rate.
2. The influence of solid content in the feed liquid: When the solid content in the feed liquid increases, the particle size of the dried product also increases. At a constant drying temperature and feed rate, due to the increase of the solid content in the feed liquid, the evaporation load It will be reduced, and thus a product with a lower moisture content will be obtained. Because the moisture evaporates quickly, it is easy to produce dry hollow particles and products with a lower bulk density.
3. The influence of the feed temperature: if the viscosity needs to be reduced for the convenience of the conveying and atomization of the feed liquid, increasing the feed temperature will have a certain impact on the properties of the dried product. Increasing the feed liquid temperature will reduce the total amount required for mist evaporation. Heat, but continue to increase the heat content of the material liquid compared with the heat required for vaporization is still very small.
4. The influence of surface tension: Surface tension affects the properties of dried products by affecting the drying and atomization mechanism. The proportion of fine droplets in the droplets is increased, and the droplet distribution is wider. The material with low surface tension produces smaller droplets, while the higher surface tension produces larger droplets, and the size distribution is also narrower.
5. The influence of the inlet temperature of the drying air: The inlet temperature of the drying air depends on the special drying of the product. For the droplets that expand during drying, increasing the drying temperature will produce large particles with lower bulk density. However, if the temperature rises To make the evaporation rate increase rapidly, thereby causing the droplets to expand, break or split, then dense fragments will be generated and denser dust will be formed.
6. The influence of droplet-air contact speed: increasing the contact speed between droplets and air will increase the degree of mixing, thereby increasing the heat and mass transfer rate. As the contact speed increases, the evaporation time becomes shorter and drying The product particles present irregular shapes, and the bulk density varies due to different products, but no general conclusion can be drawn.
