Maximum Percent by Weight
Size, Microns
Less Than Particle Size
60
[_____]
40
[_____]
30
[_____]
20
[_____]
15
[_____]
10
[_____]
7.5
[_____]
1.0
[_____]
Maximum
Minimum
h.
Fly ash density, for
hopper volume design,
pounds per cubic foot
[_____]
[_____]
i.
Fly ash density for weight
determination, pounds per
cubic foot (compacted)
[_____]
[_____]
j.
Excess Air (range)
[_____]
[_____]
Verify data in the field and design the precipitator(s) to operate
efficiently over the entire range of inlet gas conditions.
1.9.4
Precipitator Data
**************************************************************************
NOTE:
1. If a spare or additional precipitator section is
included, the following should be added to the
collection efficiency: "with one section out of
service."
2.
As a general rule, use four fields.
3. Usually a minimum of two electrically isolatable
bus section per field is used.
4. Maximum velocity through precipitator is in the
range of 1.22-2.13 m/s 4-7 fps.
5. Minimum specific collecting area is in the range
of 69 to 98 square meter per 1000 L/s 350 to 500
square feet per 1000 acfm.
6.
Minimum aspect ratio should be at least 1.5.
7. Minimum hopper storage should be at least 12
hours.
8. Usually a 55 degree hopper valley angle is used.
If the ash is "sticky" as for western coal, or if
moisture content is high, a 65 degree angle should
be used.
SECTION 15862N
Page 20
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