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L-23
Gravity settling chamber
Air Pollution and Control
(Elective-I)
Gravity settling chamber
• Gravity settling chamber is used to
remove large and abrasive particles
greater than 50 µ from a gas stream.
• This
is
a
simple
particulate
collection device using the principle of
gravity to settle the particulate matter in a
gas stream passing through its long
chamber.
Prof S S Jahagirdar, NKOCET

2
• The primary requirement of such a device
would be a chamber in which the carrier
gas velocity is reduced so as to allow the
particulate matter to settle out of the
moving gas stream under the action of
gravity.
• This particulate matter is then collected at
the bottom of the chamber.
• The chamber is cleaned manually to
dispose the waste.
Prof S S Jahagirdar, NKOCET

3
Gas
outlet

Prof S S Jahagirdar, NKOCET

4
Prof S S Jahagirdar, NKOCET

5
Prof S S Jahagirdar, NKOCET

6
Gravity settling chamber with trays

Prof S S Jahagirdar, NKOCET

7
• The gas velocities in the settling
chamber must be sufficiently low for
the particles to settle due to
gravitational force.
• Literature indicates that gas velocity
less than about 3 m/s is needed to
prevent re-entrainment of the settled
particles. The gas velocity of less than
0.3 m/s will produce good results.
Prof S S Jahagirdar, NKOCET

8
Design Parameters:For 100 % efficiency

H L
t 
Vt VH

--------------Eq -i

Where,
H= height of settling chamber
L = Length of settling chamber
Vt = Velocity of settling
VH = velocity of flow

Prof S S Jahagirdar, NKOCET

9
From equation I Settling velocity may be given by

VH H
Q
Vt 

L
LW

-------------Eq – ii

W= width of chamber
(As Q = area of inlet x velocity = W.H.VH )
For streamline flow settling velocity is given by
2

Vt 

g .d p . p

------------- Eq- iii

18.
Prof S S Jahagirdar, NKOCET

10
• Equating equations ii and iii,
2

VH H g .d p . p

L
18.
therefore, we get,

d p min 

18. H .V H
g .L. p

-------Eq iv

dpmin is min size of particle that can be removed
with 100 % efficiency
Prof S S Jahagirdar, NKOCET

11
For better and conservative results
multiplying factor 2 can be taken

d p min

18. H .VH
 2
g.L. p

Efficiency of settling chamber is given by

d

p

 dp

 dp

m in






2

Prof S S Jahagirdar, NKOCET

12
• Another equation for calculation of efficiency is
2

 g .d p  p .L 
  1  exp  

 18. .V .H 
H



Prof S S Jahagirdar, NKOCET

13
Settling chamber with trays
Settling trays can be used to improve removal
efficiency.

Prof S S Jahagirdar, NKOCET

14
If, n = number of trays, then equation iv
becomes

d p min 

18. H .V H
n. g .L . p

Prof S S Jahagirdar, NKOCET

15
Prof S S Jahagirdar, NKOCET

Advantages
1.
2.
3.
4.
5.

Low initial cost
Simple construction
Low maintenance cost
Low pressure drop
Dry and continuous disposal of collected
solids
6. Can be constructed of any material
7. Temperature and pressure limitations are
imposed by type of material used

16
Disadvantages
1. Large space requirement
2. Only comparatively large particles can
be collected

Prof S S Jahagirdar, NKOCET

17
Prof S S Jahagirdar, NKOCET

Applications of settling chamber
• Settling chambers are mostly used as
pre-cleaners. They are sometimes used in
the process industries, particularly in the
food and metallurgical industries as the
first step in dust control.
• Use of settling chambers as pre-cleaners
can also reduce the maintenance cost of
high efficiency control equipment, which is
more subject to abrasive deterioration.
18
Problem (Peavy -Rowe)

Assume viscosity of air = 2.1 x 10-5 kg/m.s

Prof S S Jahagirdar, NKOCET

19
Solution :-

Prof S S Jahagirdar, NKOCET

20
Objective questions
Q1. Gravity settling chamber removes _____________
particles.
Q2. In gravity settling chamber, the gas velocity of less
than _______ m/s will produce good results.
Q3. If trays are used in settling chamber efficiency
_______________.
Q4. True or false?
1.Settling chamber can be connected with other control
equipments in series to increase efficiency.
Prof S S Jahagirdar, NKOCET

21
2. Settling chamber can remove less than 1 µ particles
with 90% efficiency.
3. Increase in flow velocity increases efficiency of
settling chamber.

Prof S S Jahagirdar, NKOCET

22
Theory questions
Q1. Explain working of gravity settling chamber with
neat sketch. Also give advantages and
disadvantages.
Q2. Write a note on ‘Design of gravity settling
chamber’.

Prof S S Jahagirdar, NKOCET

23

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L 23 and 24 final

  • 1. L-23 Gravity settling chamber Air Pollution and Control (Elective-I)
  • 2. Gravity settling chamber • Gravity settling chamber is used to remove large and abrasive particles greater than 50 µ from a gas stream. • This is a simple particulate collection device using the principle of gravity to settle the particulate matter in a gas stream passing through its long chamber. Prof S S Jahagirdar, NKOCET 2
  • 3. • The primary requirement of such a device would be a chamber in which the carrier gas velocity is reduced so as to allow the particulate matter to settle out of the moving gas stream under the action of gravity. • This particulate matter is then collected at the bottom of the chamber. • The chamber is cleaned manually to dispose the waste. Prof S S Jahagirdar, NKOCET 3
  • 4. Gas outlet Prof S S Jahagirdar, NKOCET 4
  • 5. Prof S S Jahagirdar, NKOCET 5
  • 6. Prof S S Jahagirdar, NKOCET 6
  • 7. Gravity settling chamber with trays Prof S S Jahagirdar, NKOCET 7
  • 8. • The gas velocities in the settling chamber must be sufficiently low for the particles to settle due to gravitational force. • Literature indicates that gas velocity less than about 3 m/s is needed to prevent re-entrainment of the settled particles. The gas velocity of less than 0.3 m/s will produce good results. Prof S S Jahagirdar, NKOCET 8
  • 9. Design Parameters:For 100 % efficiency H L t  Vt VH --------------Eq -i Where, H= height of settling chamber L = Length of settling chamber Vt = Velocity of settling VH = velocity of flow Prof S S Jahagirdar, NKOCET 9
  • 10. From equation I Settling velocity may be given by VH H Q Vt   L LW -------------Eq – ii W= width of chamber (As Q = area of inlet x velocity = W.H.VH ) For streamline flow settling velocity is given by 2 Vt  g .d p . p ------------- Eq- iii 18. Prof S S Jahagirdar, NKOCET 10
  • 11. • Equating equations ii and iii, 2 VH H g .d p . p  L 18. therefore, we get, d p min  18. H .V H g .L. p -------Eq iv dpmin is min size of particle that can be removed with 100 % efficiency Prof S S Jahagirdar, NKOCET 11
  • 12. For better and conservative results multiplying factor 2 can be taken d p min 18. H .VH  2 g.L. p Efficiency of settling chamber is given by d p  dp   dp  m in     2 Prof S S Jahagirdar, NKOCET 12
  • 13. • Another equation for calculation of efficiency is 2  g .d p  p .L    1  exp     18. .V .H  H   Prof S S Jahagirdar, NKOCET 13
  • 14. Settling chamber with trays Settling trays can be used to improve removal efficiency. Prof S S Jahagirdar, NKOCET 14
  • 15. If, n = number of trays, then equation iv becomes d p min  18. H .V H n. g .L . p Prof S S Jahagirdar, NKOCET 15
  • 16. Prof S S Jahagirdar, NKOCET Advantages 1. 2. 3. 4. 5. Low initial cost Simple construction Low maintenance cost Low pressure drop Dry and continuous disposal of collected solids 6. Can be constructed of any material 7. Temperature and pressure limitations are imposed by type of material used 16
  • 17. Disadvantages 1. Large space requirement 2. Only comparatively large particles can be collected Prof S S Jahagirdar, NKOCET 17
  • 18. Prof S S Jahagirdar, NKOCET Applications of settling chamber • Settling chambers are mostly used as pre-cleaners. They are sometimes used in the process industries, particularly in the food and metallurgical industries as the first step in dust control. • Use of settling chambers as pre-cleaners can also reduce the maintenance cost of high efficiency control equipment, which is more subject to abrasive deterioration. 18
  • 19. Problem (Peavy -Rowe) Assume viscosity of air = 2.1 x 10-5 kg/m.s Prof S S Jahagirdar, NKOCET 19
  • 20. Solution :- Prof S S Jahagirdar, NKOCET 20
  • 21. Objective questions Q1. Gravity settling chamber removes _____________ particles. Q2. In gravity settling chamber, the gas velocity of less than _______ m/s will produce good results. Q3. If trays are used in settling chamber efficiency _______________. Q4. True or false? 1.Settling chamber can be connected with other control equipments in series to increase efficiency. Prof S S Jahagirdar, NKOCET 21
  • 22. 2. Settling chamber can remove less than 1 µ particles with 90% efficiency. 3. Increase in flow velocity increases efficiency of settling chamber. Prof S S Jahagirdar, NKOCET 22
  • 23. Theory questions Q1. Explain working of gravity settling chamber with neat sketch. Also give advantages and disadvantages. Q2. Write a note on ‘Design of gravity settling chamber’. Prof S S Jahagirdar, NKOCET 23