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Biomass Dryer Classification

Biomass Dryer Classification
From biomass combustion to wood pellet and briquette production, drying your biomass can be a key step in your plant’s processing efficiency. Wood biomass dryers come in a variety of types, temperatures, and configurations.
Why biomass drying?
This mass water content does not allow natural products to be stored for longer periods in a appropriate manner and does not contribute to the heating value of the alternative fuel itself. Besides, biomass drying brings several benefits to combustion boilers, such as: Increased efficiency, Lower air emissions, Improved operation. In general, biomass drying systems upgrade natural feedstuff or products to a valuable energy source. There are many types of dryers used in drying biomass, including rotary dryers, conveyor dryers, flash dryers and others.

biomass drying machine

Rotary dryer-Most Common for wood
Rotary dryers are the most common type for biomass drying and have low maintenance costs. Their robust and simple construction combines flexibility with reliability, enabling this type of dryer to operate under the most arduous conditions. They can handle a vast range of materials and are less sensitive to particle size. The material moisture however is hard to control in rotary dryers because of the long lag time.
Belt/conveyor dryer
In conveyor dryers, the feedstock is spread onto a moving perforated conveyor to dry the material in a continuous process. Fans blow the drying medium through the conveyor and feedstock, either upward or downward. If multiple conveyors are used they can be in series or stacked . Conveyor dryers are very versatile and can handle a wide range of materials.
Flash dryer
Flash dryers are able to dry biomass rapidly, owing to the easy removal of free moisture, which are very versatile and can handle a wide range of materials. Wet material is mixed with a stream of heated air (or other gas), which conveys it through a drying duct where high heat and mass transfer rates rapidly dry the product. Flash dryers are generally cost effective only at larger scales. Electricity use by flash dryers is greater than that of other dryer types because high air flows are required to keep the material suspended.
Dryers can also be classified into fixed-bed and fluidised-bed designs according to the hot air velocity flowing through the bed. Drying biomass is a significant process step, required for a variety of reasons, from reducing transportation costs to preparation of the biomass feedstock for combustion. Allance machinery can supply various dryer types to satisfy customers' need.