Provision of stacks in industry

1. Stack Height
What is stack in air pollution?-
Stacks are large chimneys designed to emit and
disperse hot air, particulate matter, and pollutants
from industries into the upper atmosphere so that
they do not create a danger to life on the ground.

2. • What is the Stack Height?
Stack height is the distance from the ground to the
top of a chimney, flue, or duct that releases emissions
into the air. Stack height is important for air pollution
control because it affects how emissions disperse.

3. Central Pollution Control Board (CPCB)
guidelines
• The CPCB mandates a minimum stack height of 30
meters (90 feet).
• The CPCB also has a formula for calculating stack
height based on emission rate

4. How stack height affects emissions
• Increasing stack height can significantly reduce
concentrations of pollutants.
• However, lower stack heights may have less impact
on ground-level concentrations.

5. Stack Height

6. Stack Height-Calculation
• Formula for calculation of Stack height:-
Δh =Vs. D/u(1.5 +2.68x10-3XP.D(TS-Ta/ Ts))
h = Physical stack ht.
D= Diameter
u= Wind Velocity
Ta = air temp
P = barometer Pressure
Vs = Stack gas Velocity
Ts = stack gas temperature
H=h+ Δh Effective Stack height