THE DENSITY CHANGE OF BIOMASS DURING COMBUSTION, 2018 PEERS

A laboratory study was performed to examine the combustion behaviors of several wood species, particularly how their densities change during combustion. The results show that hardwood is generally denser than softwood, as expected. For all wood species examined, the density decreases drastically throughout combustion but at different rates depending on the combustion stage. During the devolatilization/volatile burning stage, the wood loses its volatile content while keeping its volume almost intact, resulting in a 75-80% decrease in density. During the char burning stage, the density continues to decrease but at a much slower rate compared to the volatile burning stage. The results also show that the combustion residue (mixture of char and ash) of softwood has a lower bulk density than that of hardwood, and that for a given wood species, the bulk density is lower for the combustion residue that contains more char and less ash. The continuing change in density during combustion can have a great impact on biomass boiler operation, as well as on ash disposal costs. 

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