Choice Of Nozzles For 1St And 2Nd Stage - Riello RL 190 Installation, Use And Maintenance Instructions

5.7

Choice of nozzles for 1st and 2nd 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.
It is advisable to replace the nozzle once a year
during periodical maintenance.
WARNING
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.
CAUTION
The manufacturing company shall not be liable for
any such damage arising from non-observance of
the requirements contained in this manual.
Both nozzles must be chosen from among those listed in table
(Tab. B).
The first nozzle determines the delivery of the burner in the 1st
stage.
The second nozzle works together with the 1st nozzle to deter-
mine the delivery of the burner in the 2nd stage.
The deliveries of the 1st and 2nd stages must be contained within
the value range indicated on pag. 6.
Use nozzles with a 60° spray angle at the recommended pres-
sure of 12 bar.
As a rule the two nozzles have equal deliveries but the 1st stage
nozzle may have a delivery less than 50% of the total delivery
when a reduction of the counter-pressure peak is desired at the
moment of starting (the burner allows good combustion rates
also with a 40 - 100 % ratio between the 1st and 2nd stage).
Example
Boiler output = 1630 kW - efficiency 90 %
Output required by the burner =
1630 : 0,9 = 1812 kW;
1812 : 2 = 906 kW per nozzle;
therefore, two equal, 60°, 12 bar nozzles are required:
1° = 18 GPH - 2° = 18 GPH,
or the following two different nozzles:
1° = 16 GPH - 2° = 20 GPH.
Installation
GPH
10 bar
5.00
5.50
6.00
6.50
7.00
7.50
8.00
8.30
8.50
9.00
9.50
10.0
10.5
11.0
12.0
12.3
13.0
13.8
14.0
15.0
15.3
16.0
17.0
17.5
18.0
19.0
19.5
20.0
21.5
22.0
light oil: density 0.84 kg/dm
(1)
perature 10 °C
11 GB
kg/h (1)
12 bar 14 bar
19.2 21.2 23.1
21.1 23.3 25.4
23.1 25.5 27.7
25.0 27.6 30.0
26.9 29.7 32.3
28.8 31.8 34.6
30.8 33.9 36.9
31.9 35.2 38.3
32.7 36.1 39.2
34.6 38.2 41.5
36.5 40.3 43.8
38.4 42.4 46.1
40.4 44.6 48.4
42.3 46.7 50.7
46.1 50.9 55.3
47.3 52.2 56.7
50.0 55.1 59.9
53.1 58.5 63.3
53.8 59.4 64.5
57.7 63.6 69.2
58.8 64.9 70.5
61.5 67.9 73.8
65.4 72.1 78.4
67.3 74.2 80.7
69.2 76.4 83.0
73.0 80.6 87.6
75 82.7 89.9
76.9 84.8 92.2
82.7 91.2 99.1
84.6 93.3 101.4
3
- viscosity 4.2 cSt/20 °C - tem-
kW
12 bar
251.4
276.3
302.4
327.3
352.3
377.2
402.1
417.5
428.2
453.1
478.0
502.9
529.0
553.9
603.7
619.1
653.5
693.8
704.5
754.3
769.7
805.3
855.1
880.0
906.1
956.0
980.9
1005.8
1081.7
1106.6
Tab. B
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