Comparative Analysis of Air Emission from Cement Plant Using TDF as Partial Substitute for Coal
Keywords:air emission, cement industry, tyre derived fuel, coal, fuel substitution
Tyre derived fuel (TDF) has a potential advantage for its use as a co-fuel with coal in rotary kilns of cement plants. In this study we analyzed the emissions of selected criteria pollutants; CO2, CO, NOx, SOx and PM to suggest suitable proportion of TDF to replace coal when different proportions of TDF and coal were used as cement kiln feed. Emissions of CO2, CO, NO, NO2, SO2 and total PM from stack and concentrations of CO, NOx, SOx and PM10 in ambient air were assessed using USEPA recommended methods. Substitution such as 85% coal and 15% TDF, 80% coal and 20% TDF, 75% coal and 25% TDF and 70% coal and 30% TDF were applied in this study. Results of the current study revealed a rise in CO and TPM stack emissions with an increase in proportions of TDF and crossed standards at 80% coal and 20% TDF. Decline in NOx emissions up-till 15% proportion of TDF was observed and remained lower than the emission of NOx at 100% coal use in spite of an increase in its concentration at each increased proportion of TDF above 15% TDF use. No significant difference (p > 0.05) in ambient air pollutant concentration with and without TDF use was observed. The study suggested 15% TDF substitution as a preferable proportion for the selected cement plant.
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