chapter - 1 introduction - Meghalaya State Pollution Control Board

Hills Cement Co. Limited.
• Flat terrain is used for computations;
• Assumed that the pollutants do not undergo physico-chemical
transformation and that there is no removal by dry dust deposition;
• Cartesian co-ordinate system has been used for computations; and
• The model computations have been done for 20 km with 500-m
interval.
• Washout by rain is not considered.
• Meteorological inputs required are wind speed and direction, ambient
temperature, stability class, and mixing height.
INPUT DATA
For the modeling purpose, sulphur dioxide, Oxides of nitrogen and
Suspended particulate matter from cement and captive thermal power project
are considered. The emission details are given below:
Cement and Captive Thermal Power Project Emissions
Captive Power Plant And Cement Plant Emissions
DESCRIPTION Raw Mill Cooler Klin Coal
Mill
Stack Height Ht.
(m)
Exit flue
Diameter(m)
Flue gas Exit
Velocity (m/s)
Flue gas Exit
Temp ( 0 C)
Cement
Mill
Packing
Plant
70 45 70 45 40 32 59
3.5 2.5 3.5 1.5 1.2 1 1.3
CPP
6.4 18.50 14.28 11.91 38.85 8.39 16.55
90 325 340 110 120 120 120
Flow rate Nm 3 /hr 1,80,000 1,80000 230000 60000 120000 18000 60000
Air Emissions
SPM in gm/sec 4.5 5.0 9.0 2.0 1.8 0.5 2.5
SO 2 in gm/sec 20.00 30
NOx in gm/sec 25.00 12.5
For the prediction purpose RSPM is taken to be 35 % of SPM emissions.
Gaussian Plume Model (ISCST3 )
The ISC short term area source model is based on a numerical integration
over the area in the upwind and cross wind directions of Gaussian plume
formula. This can be applied to the point, area, and line or volume sources
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