Unigas HP60, Manual Of Installation - Use - Maintenance

Page: 5 / 60

C.I.B. UNIGAS - M03957CI
5
Fig. 2
Data are referred to standard conditions: atmospheric pressure at 1013mbar, ambient temperature at 15°C
Checking the proper gas train size
To check the proper gas train size, it is necessary to know the available gas pressure value upstream the burner’s gas valve. Then
subtract the backpressure. The result is called
p
gas.
Draw a vertical line matching the furnace input value (600kW, in the example),
quoted on the x-axis, as far as intercepitng the network pressure curve, according to the installed gas train (DN65, in the example).
From the interception point, draw an horizontal line as far as matching, on the y-axis, the value of pressure necessary to get the reque-
sted furnace input. This value must be lower or equal to the
p
gas
value, calculated before.
Fig. 3
Matching the burner to the boiler
The burners described in this manual have been tested with combustion chambers that comply with EN676 regulation and whose
dimensions are described in the diagram . In case the burner must be coupled with boilers with a combustion chamber smaller in dia-
meter or shorter than those described in the diagram, please contact the supplier, to verify that a correct matching is possible, with res-
pect of the application involved. To correctly match the burner to the boiler verify the necessary input and the pressure in combustion
chamber are included in the burner performance curve; otherwise the choice of the burner must be revised consulting the burner manu-
facturer. To choose the blast tube lenght follow the instructions of the boiler manufacturer. In absence of these consider the following:
z
Cast-iron boilers, three pass flue boilers (with the first pass in the rear part): the blast tube must protrude no more than 100 mm into
the combustion chamber.
z
Pressurised boilers with flame reversal: in this case the blast tube must penetrate at least 50 - 100 mm into combustion chamber in
respect to the tube bundle plate.
z
The length of the blast tubes does not always allow this requirement to be met, and thus it may be necessary to use a suitably-sized
spacer to move the burner backwards or to design a blast tube tha suites the utilisation (please, contact the manifacturer).
Fig. 4
Key
a) Heat output in kW
b) Lenght of the flame tube in meters
c) Flame tube firing intensity in MW/m
3
d) Combustion chamber diameter (m)
Fig. 4 - Firing intensity, diameter and lenght of the test flame tube as a function of the heat
input in kW.
Campo di lavoro bruciatori
Tipo P60 Mod. M-xx.x.IT.A.0.50 - M-.xx.x.IT.A.0.65
-1
0
1
2
3
4
5
6
7
8
100 200 300 400 500 600 700 800 900
Potenza kW
Contropressione in camera di
combustione mbar
A
( )
0
5
10
15
20
25
100 200 300 400 500 600 700 800 900
Potenza / Output (kW)
Min
im
a p
ressio
n
e g
as in
ret
e / Min
imu
m in
let
g
as
p
ressu
re (
m
b
ar)
Rp 2" (50)
DN65