Riello PRESS 2G - Nozzle Installation; Choice of Nozzles for 1 St and 2 Nd Stage

17
20140894
GB
Installation
5.8 Nozzle installation
5.8.1 Choice of nozzles for 1
st
and 2
nd
stage
The burner complies with the emission requirements of the
EN 267 standard.
In order to guarantee that emissions do not vary, recommended
and/or alternative nozzles specified by Riello in the Instruction
and warning booklet should be used.
The nozzle must be chosen from among those listed in (Tab. F).
Use nozzle with atomization angle of 60° and, if possible, at a
pressure of 12 bar.
Example with the Press 1G Model:
Boiler output = 270 kW - efficiency 90 %
Output required by the burner =
270 : 0.9 = 300 kW;
300 : 2 = 150 kW per nozzle;
therefore, two equal, 60°, 12 bar nozzles are required:
1° = 3.00 GPH - 2° = 3.00 GPH,
or the following two different nozzles:
1° = 2.50 GPH - 2° = 3.50 GPH, or
1° = 3.50 GPH - 2° = 2.50 GPH.
NOTE:
Other information regarding nozzles may be found on ‘Noz-
zle” on page 18.
(1)
We get the indicated delivery when both nozzles are working
and gas oil has the following characteristics:
density 0.84 kg/dm
3
- viscosity 4.2 cSt/20 °C - temperature
10 °C
Tab. F
WARNING
It is advisable to replace nozzles every year
during regular maintenance operations.
CAUTION
The use of nozzles other than those specified by
Riello S.p.A. and inadequate regular maintenance
may result into emission limits non-conforming to
the values set forth by the regulations in force, and
in extremely serious cases, into potential hazards
to people and objects.
The manufacturing company shall not be liable for
any such damage arising from non-observance of
the requirements contained in this manual.
GPH
Delivery kg/h (1)
kW
12 bar
10 bar 12 bar 14 bar
PRESS GW
2.00 7.7 8.5 9.2 100.8
2.25 8.6 9.5 10.4 112.7
2.50 9.6 10.6 11.5 125.7
3.00 11.5 12.7 13.8 150.6
3.50 13.5 14.8 16.1 175.5
4.00 15.4 17.0 18.4 201.6
PRESS 1G
2.00 7.7 8.5 9.2 100.8
2.25 8.6 9.5 10.4 112.7
2.50 9.6 10.6 11.5 125.7
3.00 11.5 12.7 13.8 150.6
3.50 13.5 14.8 16.1 175.5
4.00 15.4 17.0 18.4 201.6
4.50 17.3 19.1 20.7 226.5
5.00 19.2 21.2 23.0 251.4
5.50 21.1 23.3 25.3 276.3
PRESS 2G
4.00 15.4 17.0 18.4 201.6
4.50 17.3 19.1 20.7 226.5
5.00 19.2 21.2 23.0 251.4
5.50 21.1 23.3 25.3 276.3
6.00 23.1 25.5 27.7 302.4
6.50 25.0 27.6 30.0 327.3
7.00 26.9 29.7 32.3 352.3
PRESS 3G
6.00 23.1 25.5 27.7 302.4
6.50 25.0 27.6 30.0 327.3
7.00 26.9 29.7 32.3 352.3
7.50 28.8 31.8 34.6 377.2
8.30 31.9 35.2 38.3 417.5
9.50 36.5 40.3 43.8 478.0
10.50 40.4 44.5 48.4 527.8
12.00 46.1 50.9 55.3 603.7
60
D339