chapter - 1 introduction - Meghalaya State Pollution Control Board

Hills Cement Co. Limited.
temperature range. Many cement plants having excellent environmental
cleanliness are successfully & satisfactorily using bag filters. For the main
stack, bag filter offers to be a better choice from environmental point of view.
Emission levels are generally low in case of bag filter compared to that of
ESP. For clinker cooler, ESP will be the only choice. Multicyclone will not be
able to maintain emission level below 50 mg/Nm 3 . Use of efficient multi
channel burners is envisaged to keep NO 2 emission low. This plant has
planned to adopt latest technology for low NOx generation in its precalcinator.
ESP will also be provided for controlling the emissions from captive power
plant. Thus, it is proposed to restrict the emission to within the stipulated
norms.
This in combination with adequate height of the stacks will help in keeping the
incremental values of pollutants to the bare minimum levels as has been
proved by dispersion modeling study. In this way, it is anticipated that the air
pollution during operation will be meager and will remain well below the
prescribed limits of CPCB/SPCB in respect of stack emissions standards as
well as ambient air quality standards.
Since Meghalaya coal contains higher sulphur content (Up to about 3)
adequate care is taken in designing the height of the chimney of AFBC boiler.
Stack of around 80 M height in line with the stipulations of the Central
Pollution Control Board will be provided.
The following measures will be adopted for the proposed power plant to
minimize air pollution:
• Particulate emission rate from flue gas at stack outlet will be restricted
to a maximum of 150 mg / Nm 3 .
• Dedusting System will be provided to arrest fugitive emissions in the
work zone.
• The dust control System will be installed and Commissioned along
with the main Plant. These Systems will be checked and their emission
rates will also be monitored.
• The stack will be provided with necessary instruments for monitoring of
SPM, SO 2 and NOx.
Dust extraction system will be installed at the following sections. The
location of air pollution control systems is also mention.
Pollution Control Consultants (India) Pvt. Ltd. 93