Fluidized drying is a drying technique developed in recent years. Fluidized bed dryers use a gas flow to act between the critical speed and the take-out speed of the material to be dried, so that the particles form a fluidized motion, thereby enhancing the heat transfer and mass transfer of both. This method allows the hot air to come into direct contact with the material while removing heat from the edges. Since the heat capacity coefficient is large and the residence time can be arbitrarily adjusted, it is suitable for the surface water and the materials that need to pass through the deceleration drying stage, especially for the drying of bulk materials.
In addition, an additional device can be added to the fluidized bed dryer to improve its operating performance and make it more adaptable, so as to achieve large-scale production of small equipment, save energy, and reduce consumption.
Recently developed and industrialized fluidized bed dryers have the following forms: single cylinder type fluidized bed dryers, multi-layer cylindrical fluidized bed dryers, horizontal multi-chamber fluidized dryers, sprays Fluidized dryers, inert particle dryers, centrifugal fluidized bed dryers, vibrating fluidized bed dryers, etc. At present, the domestic fluidized bed dryer has developed to a more mature stage in terms of structure, performance, etc. It has been widely used in chemical, pharmaceutical, food, fertilizer, plastic and other industries.
Fluidized bed dryers have the following advantages:
(1) Since the contact area of ​​the material and the drying medium is large, and the material is continuously stirred violently in the fluidized bed, the heat transfer effect is good. The thermal capacity coefficient can reach (2.3 ~ 7.0) kW/m3 · K, and the volumetric heat transfer coefficient can reach (2000 ~ 6000) kcal/m3 · h · °C.
(2) The temperature distribution in the fluidized bed is uniform, thus avoiding any local overheating of the product. The material temperature during constant speed drying is almost the same as the wet bulb temperature of the hot air, so it is suitable for the drying of heat sensitive materials.
(3) The time for the drying material to stay in the fluidized bed can be arbitrarily extended. The drying time can be selected and adjusted as needed to facilitate the control of the moisture content of the dried product. The moisture content of the dried product is stable.
(4) Special devices such as stirrers, internal heat exchangers, vibrators etc. can be installed in the fluidized bed to extend the application of the equipment to the drying of materials such as paste-like materials and suspensions.
(5) The equipment structure is simple, and the production capacity is large. The processing capacity per hour can range from tens of kilograms to hundreds of tons. Continuous operation can be performed in the same device, and intermittent operation can also be performed.
(6) The drying device itself does not include mechanical moving parts, the investment cost of the equipment is low, and the maintenance workload is small.
In addition, an additional device can be added to the fluidized bed dryer to improve its operating performance and make it more adaptable, so as to achieve large-scale production of small equipment, save energy, and reduce consumption.
Recently developed and industrialized fluidized bed dryers have the following forms: single cylinder type fluidized bed dryers, multi-layer cylindrical fluidized bed dryers, horizontal multi-chamber fluidized dryers, sprays Fluidized dryers, inert particle dryers, centrifugal fluidized bed dryers, vibrating fluidized bed dryers, etc. At present, the domestic fluidized bed dryer has developed to a more mature stage in terms of structure, performance, etc. It has been widely used in chemical, pharmaceutical, food, fertilizer, plastic and other industries.
Fluidized bed dryers have the following advantages:
(1) Since the contact area of ​​the material and the drying medium is large, and the material is continuously stirred violently in the fluidized bed, the heat transfer effect is good. The thermal capacity coefficient can reach (2.3 ~ 7.0) kW/m3 · K, and the volumetric heat transfer coefficient can reach (2000 ~ 6000) kcal/m3 · h · °C.
(2) The temperature distribution in the fluidized bed is uniform, thus avoiding any local overheating of the product. The material temperature during constant speed drying is almost the same as the wet bulb temperature of the hot air, so it is suitable for the drying of heat sensitive materials.
(3) The time for the drying material to stay in the fluidized bed can be arbitrarily extended. The drying time can be selected and adjusted as needed to facilitate the control of the moisture content of the dried product. The moisture content of the dried product is stable.
(4) Special devices such as stirrers, internal heat exchangers, vibrators etc. can be installed in the fluidized bed to extend the application of the equipment to the drying of materials such as paste-like materials and suspensions.
(5) The equipment structure is simple, and the production capacity is large. The processing capacity per hour can range from tens of kilograms to hundreds of tons. Continuous operation can be performed in the same device, and intermittent operation can also be performed.
(6) The drying device itself does not include mechanical moving parts, the investment cost of the equipment is low, and the maintenance workload is small.
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