Influence of drying temperature of horizontal spray dryer: In the operation of horizontal spray dryer, it is very important to determine the temperature of the hot air entering the tower (hot air temperature) and the outlet temperature (exhaust air temperature).
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.
The hot air temperature of the horizontal spray dryer will have a significant impact on the bulk density of the product. High-temperature hot air tends to produce low bulk density, which is due to the rapid drying effect of hot air, which hardens the surface of the particles and expands the residual moisture, which promotes the formation of balloon-like hollow particles.
If high bulk density (low specific volume) is required, or solid particles are required, the design should not use hot air at high temperatures to contact the newly formed droplets. In the drying of chemicals, the hot air temperature is as high as 538 °C, and the product particles are large. It was found that the residual steam had sufficient pressure to blow the outer surface into a cavity. In food spray drying, the temperature of hot air generally does not exceed 177°C, so the initial diameter of hollow particles is not as large as that of chemicals.
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