Bag Filter Design Calculations

Suction Air Calculation Suction Air Quantity

Q

=

Design Margin

1000 m3/hr 25%

Air Quantity

Q

=

Material factor

f

=

1250 m3/hr 2

Dry and Dusty

Suction Air Quantity

Q1 = Q2 =

No of Suction Hoods

H1 = H2 =

Total Suction Air Quantity

Q

=

11250 m3/hr

Capture Velocity Vc

= = =

0.8 m/s 2.5 m/s 3 m/s

2500 m3/hr 1250 m3/hr

Heavy (Screen Bldg) Light (I-Bin)

4 1

Hood Design

Air quantity Also

Q1 = Q1 =

Area

A1 =

0.87 m2

Hood Size (m x m)

H1 =

0.93

Air quantity Also

Q2 Q2 =

0.35 m3/s Area (A) x

Area

A2 =

Hood Size (m x m)

H2 =

0.69 m3/s Area (A) x

x

powder grains lumps

Capture Velocity (Vc)

0.93

Capture Velocity (Vc)

0.434 m2 0.66

x

0.66

Duct Design at Suction Duct Velocity

Vd =

Suction Air Quantity

Q1 = 0.69 m3/s Q1 = (3.14*d*d)/4 x

Diameter of Duct

d1

= =

22 m/s 18 m/s

0.200 m 200 mm

Horizontal Vertical

Duct Velocity Vd

Suction Air Quantity

Diameter of Duct

Q2 = 0.35 m3/s Q2 = (3.14*d*d)/4 x d2

= =

Duct Velocity Vd

0.142 m 140 mm

Duct Design at Intersections Suction Air Quantity

Diameter of Duct at Suction

Qi1 = 1.39 m3/s Qi1 = (3.14*d*d)/4 x di1 = =

Suction Air Quantity

Diameter of Duct at Suction

= Suction Air Quantity

Diameter of Duct at Suction

di3 =

Diameter of Duct at Suction

= Suction Air Quantity

Diameter of Duct at Suction

=

Duct Velocity Vd

0.200 m 200 mm

Qi4 = 3.47 m3/s Qi4 = (3.14*d*d)/4 x di4 =

Duct Velocity Vd

0.401 m 400 mm

Qi4 = 0.69 m3/s Qi4 = (3.14*d*d)/4 x di4 =

Duct Velocity Vd

0.284 m 280 mm

Qi3 = 2.78 m3/s Qi3 = (3.14*d*d)/4 x

= Suction Air Quantity

0.284 m 280 mm

Qi2 = 1.39 m3/s Qi2 = (3.14*d*d)/4 x di2 =

Duct Velocity Vd

0.448 m 445 mm

Duct Velocity Vd