Co-firing combustion characteristics of different ages of Bambusa balcooa relative to a high ash coal
Abstract Bambusa balcooa samples of 1, 3 and 4 years old were subjected to torrefaction at 250 °C and 280 °C, and low temperature carbonization at 350 °C and 400 °C to establish their combustion, co-combustion and physicochemical properties. The combustibility of these raw and thermally treated bamboo materials was studied using thermogravimetric analysis (TGA). The nitrogen content of the raw bamboo samples decreased with the plant’s age and there was no correlation between the volatile matter content of the bamboo and the age of the samples. The calorific values (CV) for the raw bamboo samples ranging from 17 MJ/kg to 18 MJ/kg, while the torrefied and carbonized samples exhibited CVs ranging from 25 MJ/kg to 28 MJ/kg and 28 MJ/kg to 30 MJ/kg, respectively. The torrefied 4 year old sample has the highest mass and energy yield, whereas the carbonized 3 year old had the highest values. Both the raw and thermally treated bamboo had higher reactivities and lower ignition temperatures than the coal. The carbonized 4 year old bamboo is found to be more compatible to coal in terms of its combustion characteristic. Therefore, it’s likely to be the preferred alternative source of fuel for co-firing with coal. Highlights Combustion of different ages of bamboo, coal and their blends was studied using TGA. Bamboo properties were enhanced by thermal treatment. Raw bamboo has the highest fuel reactivity and lowest ignition temperature. DTG curves indicate that Bamboo-biochar improves the reactivity of blends. All samples tested exhibit lower burnout temperatures compared to coal.
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