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Spray drying is the most widely used process in the liquid forming and drying industry. It is particularly suitable for producing powdered or granular solid products from liquid raw materials such as solutions, emulsions, suspensions, and pastes. Therefore, spray drying is an ideal process when the particle size distribution, residual moisture content, bulk density, and particle shape of the final product must meet precise standards.
Principle:
The air passes through filtration and heating, then enters the air distributor at the top of the dryer, where the hot air spirals evenly into the drying chamber. The feed liquid is sprayed into extremely fine mist-like droplets by the high-speed centrifugal atomizer (rotating) at the top of the tower, flowing in parallel with the hot air, and can be dried into a finished product within an extremely short time. The finished product is continuously discharged from the bottom of the drying tower and the cyclone separator, while the exhaust gas is vented into the atmosphere by a fan.
Features:
● Fast drying speed: after the feed liquid is atomized, its surface area increases significantly. In the hot air flow, 95%-98% of the moisture can be evaporated instantly, and the drying process is completed in just a few seconds, making it especially suitable for drying heat-sensitive materials.
● The product exhibits excellent uniformity, flowability, and solubility, with high purity and superior quality.
● The production process is simplified, making operation and control convenient. For liquids with a moisture content of 40-60% (up to 90% for special materials), it can be dried into powder or granular products in a single step, eliminating the need for crushing and screening after drying. This reduces production steps and improves product purity. The particle size, bulk density, and moisture content of the product can be adjusted within a certain range by changing operating conditions, making control and management very convenient.
Technical Data Table:
| Project/Parameter | Model: LPG | |||||
| 5 | 25 | 50 | 100 | 150 | 200-2000 | |
| Inlet Temperature ℃ | 140~350 automatic control | |||||
| Outlet Temperature ℃ | ~80-90 | |||||
| Water **evaporation rate kg/h** | 5 | 25 | 50 | 100 | 150 | 200-2000 |
| The rotation form of the centrifugal spray head. | Compressed air transmission | Mechanical transmission | ||||
| Speed (r.p.m) | 25000 | 18000 | 18000 | 18000 | 15000 | 8000-15000 |
| Spray disc diameter (mm) | 50 | 100 | 120 | 140 | 150 | 180-340 |
| heat source | Electricity | Electricity + Steam | Electricity + Steam, Fuel Oil, Gas | To be resolved by the user themselves. | ||
| Electric heating **power KW** | 9 | 36 | 63 | 81 | 99 | |
| Length × Width × Height (m) | 1.8×0.93×2.2 | 3×2.7×4.26 | 3.7×3.2×5.1 | 4.6×4.2×6 | 5.5×4.5×7 | Determine based on the specific circumstances. |
| Dry powder recovery rate % | ≥95 | ≥95 | ≥95 | ≥95 | ≥95 | ≥95 |
Note: Some parameters are adjusted during design based on different materials; the design shall prevail.
