Abstract
Electrostatic Precipitators (ESP) are control devices widely used for collection of fly ash in Indian coal based thermal power plants. The design, performance, sizing, collection and operation of ESP depend largely on the properties and quality of the coal burned and the fly ash generated in the boilers. This study presents the influence of fly ash composition on the resistivity of Indian fly ash generated from coal based power plants, which is one of the critical parameter required to make accurate predictions of ESP in terms of their collection efficiency. The fly ash electrical resistivity measurements were conducted over a wide range of temperature in both ascending and descending cycles in the range of 90 to 455oC at 9% moisture as per IEEE-Standard 548 (1991). The earlier developed Empirical relations used for calculating fly ash electrical resistivity for western coals were modified for the calculations of electrical resistivity of Indian fly ashes and new empirical relations have been developed based on experimental results and chemical composition of fly ash samples collected from different coal based power plants in India which have different chemical composition in comparison to western coals. Results in the newly developed correlations show better agreements with experimentally determined resistivity compared to those developed by Bickelhaupt and others.
Highlights
Electrostatic Precipitator (ESP) is still one of the most cost effective means of controlling particulate emissions from large industrial process plant
The chemical compositions of fly ash samples collected from different power plants were used as input to a model for predicting resistivity for Indian coals
The collection efficiency of an electrostatic precipitator collecting fly ash from a coal-fired boiler is strongly influenced by the operating voltage and current in each of the precipitator's electrical sections
Summary
Electrostatic Precipitator (ESP) is still one of the most cost effective means of controlling particulate emissions from large industrial process plant. A laboratotary set up was established to measure electrical resistivity (IEEE-Standard 548, 1991) of fly ash generated by indian power plants using different coal found in different parts of India jointly by Sounthern research institute Birmingham USA and IIT Delhi In India.
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