High Speed Centrifugal Spray Dryer
The spray dryer is a drying equipment that can directly dehydrate and dry liquid solution materials into powdery granular dry materials. Centrifugal spray dryer and spray drying tower are widely used in liquid forming process and drying industry. Especially suitable for the production of powdered and granular solid products from suspoemulsion, solution, emulsion and pasty liquid raw materials. Therefore, when the particle size distribution, residual moisture content, bulk density and particle shape of the finished product meet the standards, the spray dryer is a better drying process. The spray dryer is also an indispensable drying equipment in the production process of many materials. So how does the spray dryer work, that is, what is its working principle? Spray dryers can be divided into centrifugal spray dryers and pressure spray dryer price in principle. We take a centrifugal spray dryer as an example for a brief description.
Product description:
High-speed centrifugal spray dryer is a kind of spray dryer. It uses a high-speed centrifugal atomizer to atomize the material and liquid, and makes the material and liquid in the form of extremely small droplets and hot air at a predetermined temperature after atomization. It is a complete set of drying equipment that can be fully contacted to complete the dehydration and drying of the material in a very short time, and finally collected by the powder collecting device. Compared with pressure spray dryers, centrifugal spray dryers have stronger adaptability to materials, and can spray dry high-concentration and high-viscosity materials, and the adjustability is greater than that of pressure spray dryers. Widely used in the chemical industry.
The working principle of centrifugal spray dryer:
The key to the working principle of centrifugal spray dryer is atomization and hot air. These two elements are the most fundamental core of centrifugal spray dryer.
1. First, the air is heated by the heater to become hot air, enters the hot air distributor installed at the top of the drying chamber, and then enters the drying chamber uniformly, and at the same time, the feed liquid is pumped to the centrifugal atomizer installed at the top of the drying tower through the screw pump. Forms extremely small mist-like droplets.
2. Then the feed liquid and the hot air are brought into contact with each other, the water evaporates quickly, and the finished product is dried in a very short time. Most of the powder products are collected and packaged by the lower cone.
3. The wet air enters the cyclone through the exhaust duct for further gas-solid separation, collects a small part of the solid materials brought out by the wet air, and finally empties through the bag filter (or water film filter, foam filter).
Structural characteristics of high-speed centrifugal spray dryer
1. When the material feed volume fluctuates, the gear transmission has a constant speed and high mechanical efficiency.
2. The long cantilever structure is adopted, so that the "automatic centering" effect can be realized when the main shaft is running, and the vibration of the main shaft and the atomizing disc can be reduced.
3. Set the floating bearing, so that the flexible shaft can be supported by three fulcrums, so that the shaft system can quickly pass the critical speed.
4. Reasonably arrange the fixed position of the support, and arrange the fixed support position at the node position to reduce the vibration load of the shafting.
Device features:
1. Centrifugal spray drying does not require strict filtering equipment, and if there is no fibrous liquid in the material liquid, the material liquid channel will not be blocked;
2. It can be used for drying of higher viscosity materials (compared with pressure spray drying);
3. Because the rotation speed of the atomizer is easy to adjust, it is easier to control the particle size of the product, and the particle size distribution is relatively concentrated;
4. When adjusting the processing capacity, it is not necessary to change the working state of the atomizer, and stable products can be obtained for the change of the feed rate at +25%:
5. Because the fog group generated by the centrifugal atomizer is basically on the same level, the droplets move along the combined direction of the radial and tangential directions, and the dry diameter is relatively large because there is almost no initial velocity in the axial direction.
6. The atomizer is a high-speed rotating precision mechanical equipment, which requires strict maintenance.
7. The drying speed is fast, generally only 5-15 seconds, and it has the characteristics of instant drying.
8. The drying process of the material is completed in a short time, which is suitable for drying heat-sensitive materials and can maintain the color, aroma and taste of the material.
9. The production process is simplified, the operation and control are convenient, and it is suitable for continuous control of production.
Advantages of high-speed centrifugal spray dryer:
1. There must be no vibration when the atomizing wheel rotates.
2. The rotating speed of the rotating disk must be high, generally 90~60M/S.
3. The surface of the liquid channel must be very smooth.
4. Uniform distribution of material and liquid on the fluid channel.
5. Uniform feeding speed
