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5
Preparation for start up
5.1
Combustion head setting (Fig. 16)
In addition to varying air flow depending on the output requested, the servomotor
3) Fig. 2 - by means of a lifting assembly - varies the setting of the combustion
head. This system allows an optimal setting even at a minimum firing rate.
For the same servomotor rotation, combustion head opening can be varied by
moving the tie rod onto holes 1-2-3, Fig. 16.
The choice of the hole (1-2-3) to be used is decided on the basis of diagram (Fig.
17) against the required maximum output. Setting is pre-arranged in the plant for
the maximum run (hole 3). When dealing with boilers featuring a strong back
pressure, if air delivery is insufficient even with the damper fully open, you can use a different setting to that illustrated in diagram
(Fig. 17) - do this by moving the tie rod onto the next highest hole numerically speaking, thus increasing the combustion head's
opening and hence air delivery
3
2
1
0
4000
4400
5000
5400
5800
6200
3
3
2
2
1
1
Fig. 16
6600
7000
7400
7800
D7903
D8417
8200
kW
Fig. 17
13
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