In the spray drying production process, when the water/material is switched, by changing the rotation speed of the feeding pump, the exhaust air temperature can be stabilized and the product quality can be stabilized. In the production process, if the exhaust air temperature of the spray drying tower is too high, the color of the material will become darker, and in severe cases, the material will be discolored or even denatured. This phenomenon is more common in the powder production process.
In the operation of the spray dryer, the exhaust air temperature is related to the moisture content of the product, and should be determined according to the allowable moisture content of the product. The higher the hot air temperature, the higher the thermal efficiency and the better the economy. However, excessive hot air temperature will cause deterioration of product quality, so the hot air temperature must be appropriately increased on the premise of ensuring product quality.
In practice, the method of program-controlled variable frequency feeding is introduced, which can stabilize the exhaust air temperature and reduce waste. For spray drying, product quality is generally determined by the exhaust air temperature. The inlet temperature of the hot air of the spray dryer will directly affect the evaporation intensity of the drying chamber. For non-heat-sensitive materials, high-temperature hot air should be used as much as possible to improve the evaporation intensity.
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