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Fluidized drying is a drying method using fluidized technology.Applicable to dry fine particle materials, such asAmmonium bicarbonate, ammonium carbonate, ammonium sulfate, ammonium chloride, etc.There are cylinder, horizontal, spray, spray airflow and other types.The wet material is added to the sieve plate, and the drying medium is blown out from below through the sieve plate to make the material boiling so as to speed up drying.[1]
Fluidized bed drying;fluidzing drying 。Also called boiling drying, an applicationFluidizationTechnology for granular solid materialsdryMethod.In the fluidized bed, the particles are dispersed in the hot gas flow, turning up and down, and interacting with each otherblendAnd collision, and there is a large contact area between the airflow and particles, so the fluidized dryer has a high volumeHeat transfer coefficient。In the fluidized dryer, hot air or flue gas enters the fluidized material layer through the gas distribution plate.Wet materials are directly added to the bed and fully mixed with dry materials in the bed.Gas solid two-phase flow in fluidized bedHeat transferandQuality transfer。Gas passing through the fluidized bedcyclone separator (SeeCentrifugal sedimentation）Recycle the entrained dust and leave.Dry the product and overflow from the outlet.
Detailed introduction
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Fluidization drying
verticalFluidized bed dryerIt is divided into single-layer and multi-layer.Due to theBackmixingIt is impossible for a single-layer fluidized bed dryer to obtain dry products with very low water content.In the multi-layer fluidized bed dryer, the gas and material flow in reverse to improve the heat utilization rate, and the moisture content of the dried product can be reduced to a very low level due to the reduction of backmixing of materials.For example, polyester has five layersFluidization equipmentAfter drying, the water content can be reduced to 0.03%.The difficulty of multi-layer fluidized bed operation is how to ensure the quantitative overflow of materials between layers and prevent the short circuit of airflow through the overflow pipe.
Horizontal multi compartmentFluidized bed dryerIts cross section is rectangular, and it is divided into several chambers (generally 4-8 chambers) with vertical baffles along the length direction.There is a clearance of tens of millimeters between the bottom of baffle plate and distribution plate (generally 1/4~1/2 of the height of static material layer).The hot air flows through the fluidized material layer from bottom to top from the distribution platecyclone separator Recycle the product dust and leave.The wet material is added from one side of the bed and passes through each room in turn.The dried product overflows from the other side.The gas flow into each room shall be adjusted as required.Usually, cold air is blown into the last room to cool the dried products quickly for packaging and storage.
Fluidization drying
Fluidized drying requires that the processed materials are not caked due to moisture, and the particle size should be 0.03~6mm.The particle size is too small, and the channeling is easy to occur during fluidization drying;If the particle size is too large, it must be operated at high gas speed, which will cause large energy consumption.
The fluidized dryer has simple structure, low maintenance cost, high thermal efficiency (the drying thermal efficiency of non combined moisture can reach 60%~80%), and volumeHeat transfer coefficientAndAir dryingEquivalent.In addition, the residence time of materials in the bed can be adjusted according to the requirements for the moisture content of the final product, which has greater adaptability.Because of these advantages, fluidized dryers are widely used in chemical production.
Fluidized bed dryer
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Fluidized bed dryerFluidization technology originated in 1921.Fluidized bed dryerAlso known as fluidized bed dryer, fluidized drying refers to the process of drying solid particles under the fluidized state by the drying medium.Since the invention of fluidization technology, drying is one of the earliest fields of application.[2]
Equipment characteristics
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oneVibrating fluidized bed dryeruseVibrating motorDrive, stable operation, low noise, long service life and convenient maintenance.High thermal efficiency, more than 30% energy saving compared with general drying devices, uniform bed temperature distribution, no local overheating, uniform fluidization, no dead corner.
2. The thickness of the material layer and the moving speed and amplitude inside the machine can be adjusted steplessly within the design range, with good adjustability and wide application.
threeVibrating fluidized bed dryerIt has little damage to the surface of materials, and can be used for drying fragile materials. It can also be used when the material particles are irregular, without affecting the effect.
4. The vibrating fluidized bed dryer adopts a totally enclosed structure, which effectively prevents the cross contamination of materials and the outside world. The environment is clean and can be operated continuously.
5. When used for mass production of high moisture materials, multiple vibrating fluidized bed dryers can be used in series to meet user requirements
