Learn About The Types Of Biomass Dryers and the Reason For Drying The Biomass

LEARN ABOUT THE TYPES OF BIOMASS DRYERS AND THE REASON FOR DRYING THE BIOMASS

WHY TO DRY THE BIOMASS ?

Drying biomass fuel improves combustion efficiency Improves boiler operation If the fuel is to be transported, drying reduces transportation costs Dry biofuels are less subject to microbiological degradation in storage.

The dried material can be used as biomass for heat generation or for making highquality biomass pallets or biomass briquettes.

TYPES OF BIOMASS DRYER

There are many types of dryers used in drying biomass, including direct- and indirect-fired rotary dryers, conveyor dryers, cascade dryers, flash or pneumatic dryers, superheated steam dryers, and microwave dryers. Selecting the appropriate dryer depends on many factors including the size and characteristics of the feedstock, capital cost, operation and maintenance requirements, environmental emissions, energy efficiency, waste heat sources available, available space, and potential fire hazard.

CONVEYOR DRYER

In conveyor biomass dryer, 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 (i.e. “multi-pass). Conveyor dryers are very versatile and can handle a wide range of materials.

CASCADE DRYERS The material is introduced into a flowing stream of hot air in an enclosed chamber. It is carried upward by the air and then cascades back to the bottom to be lifted again. Material is drawn out through openings in the side of the chamber

FLASH DRYERS

In flash dryer, the feedstock is suspended in an upward flow of the drying medium, usually flue gas. Flash dryers are appropriate for drying a wide variety of materials.

Flash dryers are generally cost-effective only at larger scales. Electricity used by flash dryers is greater than that of other dryer types because high air flows are required to keep the material suspended. Flash dryers require a small particle size and so shredders may be required, also increasing electrical use.

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