Hot gas generators that use biomass as fuel natural for systems that require thermal energy
Due to the variety of materials that can be considered biomass, there are several processes for transforming biomass heat source, such as those involving direct combustion and thermochemical processes (gasification, pyrolysis, and liquefaction transesterification).
Furnaces are direct combustion devices designed to ensure complete burning of the fuel efficiently and continuously, in order to exploit its thermal energy released in the combustion, with maximum yield in the conversion of the chemical energy of the fuel into thermal energy.
Types of furnaces
Furnaces may be classified as direct fire, wherein the gas resulting from the combustion are mixed with ambient air and blown by a fan directly in the final application (drying of grains, sawdust, etc.), and indirect fire, wherein the gas from the combustion pass through a heat exchanger which heats the drying air.
Furnace of direct fire (pyrolytic burner)
The systems for air heating which use solid fuel have similar characteristics in its construction and differ only in the shape, size and location of inlet air in the supply system, at the exit of the combustion products and may be descending or ascending flow.
Furnace of indirect fire (cyclonic burner)
Commonly, the furnaces designed to burning pulverized solid fuels (sawdust, ground charcoal, coffee straw, rice straw, etc.) must have, in addition to the essential components of all furnaces, fuel tank and feed and distribution systems.
Scaling the furnace for biomass
A well designed furnace must have minimum dimensions but sufficient for efficient combustion with minimum excess air.