Environmental Engineering Reference
In-Depth Information
Combusting Conditions
Preheated Air
(m/s)
Fuel
(m/s)
Fuel Injection
Angle
Exhaust NO
x
(ppm; O
2
= 11%)
Type (a)
52
52
350
Type (b)
52
79
Parallel
110
Type (c)
52
40
Parallel
100
Type (d)
52
40
9 degree
148
Type (e)
74
40
Parallel
74
temperature 1100˚C, and the flow velocities were adjusted according to the nozzle
sizes of burners and air holes so that the air ratio was constant.
Table 2.2
also shows
the results obtained by measuring the concentration of exhaust NO
x
under various
conditions (conversion rate of oxygen = 11%) using an NO
x
meter (Horiba Manu-
facturing Co. PG235).
Photographs of the flame under conditions (a) and (e) are shown in
Figures 2.15a
through c. The condition (a) produced the usual flame which combusts the concen-
trated fuel and air, and the resulting NO
x
concentration was 350 ppm, a high value.
However, in the cases of conditions (b) through (e) of the distributed combustion
flame, the flame elongated, and it became difficult to observe the flame with the eye
(a)
(b)
(c)
FIGURE 2.15
Photograph of flame. Condition (a), in-furnace temperature 1100˚C, Condition
(b), downstream of flame, and Condition (c), upstream of flame 1100˚C.
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