Start-Up Output; Combustion Head; Emissions - Riello RX25 S/PV H Instrucciones De Instalación, Montaje Y Funcionamiento

6.6.3

Start-up output

The start-up output can be varied by means of the START trim-
mer located on the equipment.
The table below gives the possible settings for a generator.
Stage Output (kW)
RX25
25
Second
12
First
14
Start
6.7

Combustion head

The combustion head comprises a highly thermal resistant cylin-
der whose surface features numerous holes, encased in a metal
"mesh" (Fig. 12).
The air-gas mixture is pushed inside the cylinder and out of the
head through the holes in the perimeter.
Combustion starts when the air-gas mixture is ignited by a spark
generated by the electrode.
The metal "mesh" is the combustion head's most essential ele-
ment since it improves burner performance considerably.
The flame developed on the surface of the head is perfectly re-
tained and adheres to the mesh when operating at the maximum
setting.
This allows modulating ratios as high as 6:1, avoiding the danger
of flashback when modulating is at its minimum.
The flame features an extremely compact geometry, meaning
that there is no risk of contact between the flame and parts of the
6.8

Emissions

The emission values of the burners are much lower than the limits
laid down by the strictest standards.
mg/kWh
Min. speed
RX70 RX25
33 5200
18 2250
33 2700
CLASS 3 LIMIT = 80 mg/kWh
70
60
50
40
CO
30
NOx
20
10
0
Minimum
modulation 7 kW
Operation
(rpm)
RX70 RX25
4600
2650
4550
generator, consequently eliminating the possible problem of poor
combustion.
The flame's structure means that smaller combustion chambers
can be developed, designed to exploit this particular feature.
D9714
The flame's distribution and its spread over a large surface
means that the burner manages to limit the formation of ther-
mal NOx, the main causes of pollutant emission.
NOx
Maximum
modulation 35 kW
15
GB
CO (%) Trimmer setting
2
RX70 RX25
8 - 9% 4,5
8 - 9% 3,5
8 - 9% 2
CO
RX70
3
4,5
10
Fig. 12
Fig. 13
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