The material is packed in a tray, and the tray is placed on the carriage to be discharged layer by layer. Steam or electricity is used as a heat source, and the hot air in the tank can be circulated and partially discharged to make the drying more uniform. Although the thermal efficiency is low, it is still used in a large amount, and it is still being manufactured. The reason is that the structure is simple, the operation is not always taken care of, and there is no obvious problem. However, many materials must be turned over and turned over when dry, and heat sensitive materials are often discolored, and are not suitable for drying with solvent materials. Due to the accumulation of materials, the inner layer has heat transfer and poor mass transfer, so the drying rate is low.
The most common way to dry powder, granules, and flakes is to apply a stream of hot air or gas to the surface of the granules. The passing air stream transfers heat to the material, causing the water to evaporate. The vaporized water vapor is taken directly into the air and is contained in the drying medium commonly used in the drying system, such as air, inert gas, direct combustion gas or superheated steam.
The method allows hot air to be in direct contact with the material and removes moisture while heating. The key is to increase the contact area between the material and the hot air to prevent the hot air from drifting. The temperature of the material during constant-speed drying is almost the same as the temperature of the wet bulb of hot air, so the heat-sensitive material can also be dried using high-temperature hot air. This drying method has a high drying rate and low equipment investment, but has low thermal efficiency.
HUMGINE products include: test box, drying box, vacuum drying box, blast drying oven, oven, vacuum oven, moisture-proof box, moisture-proof cabinet, nitrogen cabinet, high temperature box, industrial oven and so on.
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