Palm kernel shell
Palm kernel shells (or PKS) are the shell fractions left after the nut has been removed after crushing in the Palm Oil Mill. Kernel shells are a fibrous material and can be easily handled in bulk directly from the product line to the end use. Large and small shell fractions are mixed with dust-like fractions and small fibers. Compared to other residues from the industry, it is a good quality biomass fuel with uniform size distribution, easy handling, easy crushing, and limited biological activity due to low moisture content.
Wood chips are small pieces of wood that can be made from a broad variety of raw material such as wood residues (i.e. logging residues, wood from forest thinning operations, stumps and roots, wood waste)
Wood chip boilers can now fill the same role as traditional fossil fuel boilers, and provide competitively priced heat for central heating or hot water needs. Wood chip allows for the automated handling and feeding of the fuel to the boiler, minimising the need for manual intervention. In that sense, a wood chip boiler is similar to a gas or oil fired boiler and does not require a fossil-fuelled boiler in support.