Table of Contents
Advertisement
Manual
The desired adjustment range of λ gives:
1
vA = =
λ
E
vA and vE are set in the structuring mode oFPA. By setting the nominal ratio wv from 0 to 1
the ratio factor v can now be adjusted from 0.8 to 1.33 or the air factor λ from 1.25 to 0.75.
v
λ
1.33
0.75
1,3
0.8
1.2
0.9
1.1
1
1
1.1
0.9
1.2
0.8
1.25
0
0.2
0.4
Figure 1-34
Relationship ratio factor v and air factor λ to standardized nominal ratio wv
If the combustion is also to take place at small flow volumes with excess air, the constant c
must be set negative. Figure 1-35 shows the gas/air ratio in the controlled state at different
air factors λ and c = 0 as well as at λ = 1 and c <0, i.e. with excess air.
Q
X
X
1
1
Gas
mA
%
3
m
/h
120
3,500
22
110
20
100
3,000
90
18
2,500
80
16
70
2,000
14
60
12
50
1,500
40
10
1,000
30
8
20
500
6
10
4
0
0
1)
constant gas/air ratio
2)
gas/air ratio with additional air excess
Figure 1-35
Display of gas/air ratio in controlled status
SIPART DR22 6DR2210
C79000-G7476-C154-03
1
= 0.8
1.25
wv
1
0.6
0.8
G
0
2,000
4,000
6,000
8,000
0
10
20
30
40
50
60
4
6
8
10
12
14
1.5 Functional description of the structure switches
1.5.4 Controller types (S1, S49 to S53)
1
1
vE = =
0.75
λ
A
V=1.33
λ
=0,75
V=1
λ
=1
V=0.8
λ
=1.25
2)
V=1, c<0
3
10,000
12,000
m
/h air
70
80
90 100
%
16
18
20
mA
1 Technical Description
= 1.333
1)
Q
L
X2
X2
67
Hide quick links:
Advertisement
Table of Contents
