MIL-HDBK-1003/6
Parameter Typical Value
diameter of nozzle
5/16 in.
time per blow
1.0 to 1.5 sec.
blows per blowing arc
23
blowers per boiler
5 (blr), 2 (economizer)
nozzle type
sharp-edge (C=0.61)
upstream pressure
100 psig (690 kPa)
air temperature
120 degrees F (49 degrees C)
0.0037 lbm/ft3.
air density @ 120 NF
Using mean values, the air consumption per cleaning cycle
would be:
0.53 x (B x (5/16)2)/(4x144) x 0.61 x (100+14.7)
m =S))))))))))))))))))))))))))))))))))))))))))))))))Q
(120+460)1/2
m = 0.118 lb/sec
V = (0.118/0.0037) = 31.83 cfs
31.83 cfs x 1.25 sec x 23 blows x 7 blowers = 6,406 ft3 per cycle
Steam Soot Blowers. Steam flow through each blower nozzle can be
10.4.4.2
calculated by an approximate formula for saturated steam prepared by Napier
(Baumeister, et. al. 1978)
EQUATION:
m = PA/70
(23)
where:
m = discharge flow in lbs/sec
A = area of orifice in in2
P = upstream pressure in lbs/in2 absolute
Example: Calculated steam requirements for 100,000 lbs/hr steam boiler
equipped with steam soot blowers and having the following parameters:
Parameter Typical Value
diameter of nozzle
5/16 in
time per blow
15 to 25 sec
blowers per boiler
5 (blr), 2 (economizer)
nozzle type
sharp-edge (C=0.61)
stream pressure
100 psig (690 kPa)
Using mean values and substituting into equation 23, the steam consumption per
cleaning cycle would be:
174
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