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Combustion effects and emission characteristics of SO2, CO, NOx and heavy metals during co-combustion of coal and dewatered sludge |
Yiying JIN,Yangyang LI(),Fuqiang LIU |
School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract The influences of dewatered sludge blending ratio in coal on flammability index (C) and combustion characteristic index (S) and release of sulfur dioxide (SO2), nitrogen oxide (NOx), carbon monoxide (CO) and heavy metals (Hg, As, Cd, Pb and Cr) were studied. The impact on combustion characteristics could be ignored if less than 20% of dewatered sludge was added in coal. Besides, emission pattern experiments of NOx, SO2, CO and heavy metals were carried out in a high-temperature tubular furnace. Results showed that the conversion rate of NOx and total emission of SO2 reduced with the increase of sludge adding ratio, and a better effect of fixing sulfur could be obtained when the blending ratio reached 30%. Concentrations and distributions of five types of heavy metals in different residues (bottom ash and fly ash) as well as in flue gas were analyzed. It was shown that the characteristics of coal and sludge, as well as the volatilization of heavy metals had a great influence on the distribution of heavy metals.
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Keywords
sewage sludge
combustion characteristic
coal
emission
heavy metals
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Corresponding Author(s):
Yangyang LI
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Online First Date: 13 October 2014
Issue Date: 03 December 2015
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