BIO, BIOA, ZIO - Combustion 911

Selection
14
5.5 Calculating the burner length
L1
L2
L O
BKL
Legend
L1 = Burner tube length
L2 = Position of burner head
L O = Furnace wall thickness
BKL = Burner chamber length (L 10 )
5.5.1 Burners in burner quarls
The position of the burner head (L2) should be appropriately selected, so that the
burner head extends into the burner quarl.
The position of the burner head is available in the following lengths:
35, 135, 235, 335 mm, etc.
The burner chamber length BKL for ensuring optimum flame formation and stable
burner operation can be found in the [Data table – p. 15].
Determine the position of the burner head: L2 = L O - BKL
The burner tube length (L1) is predefined, depending on the flame shape R, K or
H: R, K burner head:
L1 = L2 + 15 mm, H burner head: L1 = L2 + 65 mm
Example
Desired burner quarl type = B, desired flame shape = R (normal).
Selected burner with 90 kW capacity = BIO 65,
suitable for burner chamber length (BKL) = 115 – 265 mm.
Furnace wall thickness L O = 340 mm.
Calculate shortest length L2:
Select maximum burner chamber length: BKL = 265 mm.
L2 = LO - BKL = 340 mm - 265 mm = 75 mm.
Compare L2 (here 75 mm) with standard lengths (35, 135, 235, 335 mm, etc.).
Select next longest standard length L2: L2 = 135 mm.
Test whether the burner chamber length BKL fits:
L O - L2 = BKL ➔ 340 mm - 135 mm = 205 mm.
205 mm falls into the burner chamber length range for burners BIO 65:
115 – 265 mm – see [Data table – p. 15].
BIO, BIOA, ZIO · Edition 05.10