11.08.2015   Bioenergy from Wood

Determination of the Ash Content

To determine the ash content, ovendry samples are placed in a ceramic crucible and the weight of each crucible and the biomass is noted. The crucibles are then placed and in the furnace at a temperature of 575 °C for 3 h (EN 14775).

After cooling, the ash content is calculated according to Eq. 8.8:

, „ 4 mA x 100

Ash (%) = A (8.8)

m0

mA = mass of ash, m0 = mass ofovendry sample

Table 8.5 Calorific values and ash content of typical South African wood species (Munalula and Meincken 2009; Smit 2010)

Biomass

Gross CV (MJ/kg)

Ash content (%)

Acacia cyclops (Rooikrans)

19.4

2.79

Eucalyptus cladocalyx (Blue Gum)

19.3

2.38

Pinus patula (Pine)

19.0

0.45

Acacia eriloba (Camelthorn)

19.3

2.79

Vitis vinifera (Vine stumps)

19.2

0.34

Acacia saligna (Port Jackson)

19.1

2.47

Acacia mearnsii (Black Wattle)

19.2

1.64

Acacia longifolia (Long Leaved Wattle)

19.1

1.32

Casuarina cunninghamiana (Beefwood)

19.0

1.67

Pinus pinaster (Cluster pine)

19.6

0.78

Похожие посты: