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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