In the old industrial spray drying operation, the product is accumulated or present on the inner wall surface of the drying tower, and many people will say that it is a normal phenomenon, which is a problem of accumulation property and thickness. However, these issues are related to the safety of operations and the quality of the dried products obtained. In the design and operation of drying towers, we always need to reduce the tendency to stick walls.
In the old industrial spray drying, the product is deposited on the inner wall surface by the following factors.
1 coarse droplets in the droplet size distribution, due to insufficient residence time (drying time), so that the surface of such a large droplet, before drying, a semi-wet state of the particles, chlorophyll drying equipment technology, flying To the wall. This is often due to a. Uneven distribution of air; b. Not completely atomized; c. The size of the drying chamber is not accurate.
2 The thermoplastic and hygroscopic properties of the product. Viscosity occurs on the surface of the granules under conditions of temperature and humidity in the drying chamber (even at low moisture levels).
3 Dry particles of dust are adsorbed on the surface of the wall. The product is adsorbed to the wall due to the geometry or roughness of the wall surface, insufficient surface cleanliness, or electrostatic forces.
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Label: Reasons for product accumulation caused by old-fashioned industrial spray dryers
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