Choice Of Nozzles For The 1St And 2Nd Stage; Nozzle Assembly; Combustion Head Setting - Riello RL 190 Installation, Use And Maintenance Instructions

kg/h
GPH
10 bar 12 bar
10,0 38,4 42,4
10,5 40,4 44,6
11,0 42,3 46,7
50,9
12,0 46,1
12,3 47,3 52,2
13,0 50,0 55,1
13,8 53,1 58,5
14,0 53,8 59,4
15,0 57,7 63,6
15,3 58,8 64,9
16,0 61,5 67,9
17,0 65,4 72,1
17,5 67,3 74,2
18,0 69,2 76,4
19,0 73,0 80,6
19,5 75,0 82,7
20,0 76,9 84,8
21,5 82,7 91,2
22,0 84,6 93,3
22,5 86,5 95,5
23,0 88,4 97,6
23,5 90,4 99,7
24,0 92,2 101,8
24,5 94,2 104,0
25,0 96,1 106,0
25,5 98,0 108,2
26,0 99,9 110,3
26,5 101,9 112,4
27,0 103,8 114,5
27,5 105,7 116,7
28,0 107,6 118,8
(A)
(D)
(E)

COMBUSTION HEAD SETTING

(F)
Notches nr
Light oil delivery in 2nd stage
(G)
kW
12 bar
14 bar
46,1 502,9
48,4 529,0
50,7 553,9
55,3 603,7
56,7 619,1
59,9 653,5
63,3 693,8
64,5 704,5
69,2 754,3
70,5 769,7
73,8 805,3
78,4 855,1
80,7 880,0
83,0 906,1
(B)
87,6 956,0
89,9 980,9
92,2 1005,8
99,1 1081,7
101,4 1106,6
103,7 1132,6
106,0 1157,5
108,3 1182,4
110,6 1207,3
112,9 1233,5
115,3 1257,2
117,6 1283,2
119,9 1308,2
122,2 1333,1
124,5 1358,0
(C)
126,8 1384,1
129,1 1409,0
D691
D692
D1248
D1249
D462
D1250
kg/h
5
CHOICE OF NOZZLES FOR 1ST AND 2ND
STAGE
Both nozzles must be chosen from among those
listed in Table (A).
The first nozzle determines the delivery of the
burner in the 1st stage.
The second nozzle works together with the 1st
nozzle to determine 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
page 6.
Use nozzles with a 60° spray angle at the rec-
ommended pressure 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.

NOZZLE ASSEMBLY

At this stage of installation the burner is still dis-
assembled from the blast tube; it is therefore
possible to fit the nozzle with the box spanner
1)(B) (16 mm), after having removed the plastic
plugs 2)(B), fitting the spanner through the cen-
tral hole in the flame stability disk. Do not use
any sealing products such as gaskets, sealing
compound, or tape. Be careful to avoid damag-
ing the nozzle sealing seat. The nozzles must
be screwed into place tightly but not to the max-
imum torque value provided by the wrench.
The nozzle for the 1st stage of operation is the
one lying beneath the firing electrodes Fig. (C).
Make sure that the electrodes are positioned as
shown in Figure (C).
Finally remount the burner 3)(D) on the slide
bars 2) and slide it up to the flange 5), keeping it
slightly raised to prevent the flame stability disk
from pressing against the blast tube.
Tighten the screws 1) on the slide bars 2) and
screws 4) fixing the burner to the flange.
If it proves necessary to change a nozzle with
the burner already fitted to the boiler, proceed
as outlined below:
- Pull back the burner on its slide bars as shown
in fig. (D)p.10.
- Remove the nuts 1)(E) and the disk 2)
- Use spanner 3)(E) to change the nozzles.
COMBUSTION HEAD SETTING
The setting of the combustion head depends
exclusively on the burner delivery in the 2nd
stage - in other words, the combined delivery of
the two nozzles selected in table (A).
Turn screw 4)(F) until the notch shown in dia-
gram (G) is level with the front surface of flange
5)(F).
Example:
The RL 190 Model with two 18 GPH nozzles
and 12 bar pump pressure.
Find the delivery of the two 18 GPH nozzles in
Table (A):
76,4 + 76,4 = 152,8 kg/h.
Diagram (G) indicates that for a delivery of
152,8 kg/h the RL 190 Model requires the com-
bustion head to be set to approx. four notches,
as shown in Figure (F).