13-11-2014, 10:07 AM
Abstracts: Emissions standards are becoming more stringer, as a result new retrofit /technique are being applied in the existing cement plant in India. Electrostatic Precipitators (ESP) are used to control fly ash emitting from the cement plants. The coal burned in cement plants in India to generate the cement are characterized by low calorific value (3500-4500) Kcal/Kg., and high ash content (35-45) %. Thus compared to U.S. and European coals, Indian coal generate about 6 to 7 times more ash for collection for similar cement generation. Besides, low sulfur content (<0.5), results in the resistivity of fly ash being 100-1000 times higher than that generated elsewhere. Thus ESPs in India, despite being much larger, have lower collection efficiencies than the ESPs in U.S/Europe. In this project we discuss some methods which are being applied in different cement plants in India to improve the collection efficiencies of ESP. The methods, which have met with success, are Flue gas conditioning by ammonia, and thereby, increasing the total collection area.