Combustion Characteristics of Fallen Fall Leaves from Ornamental Trees in City and Forest Parks

Ľubomír Pňakovič, Ladislav Dzurenda


Combustion characteristics of leaves fallen off ornamental trees in city and forest parks were evaluated. The moisture content of the leaves at the time of falling was between Wr = 36.1 and 46.9%. The average contents of the individual elements in the combustible material were Cdaf = 48.1%, Hdaf = 6.1%, Ndaf = 1.2%, Sdaf = 0.1%, and Odaf = 44.6%. The resulting ash from the dry leaves varied between Ad = 4.8 and 13.1%. The heat of combustion of the dry leaves was between Qs = 16,046 and 20,247, and the lower heating value was between Qn = 13,479 and 19,120 The results were compared with dry firewood of hard deciduous trees. The higher heating value of the dry leaves was 11.7% lower and the lower heating value was also lower by 15.1%. The decline of these basic combustion characteristics is caused mostly by its high ash content and to a smaller extent by the increased nitrogen content.


Biofuel; Leaves; Humidity; Elemental analysis of combustible; Higher heating value; Lower heating value; Ash

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