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Possibility of NOx emission reduction from combustion process using sewage sludge gasification gas as an additional fuel

Werle S.

Archives of Environmental Protection

2012

Vol. 38, no. 3

81-89

In the paper, a numerical simulation of the co-combustion process of sewage sludge gasification syngas in a hard coal-fired boiler was done. Two different syngases (SS1 and SS2) were taken in consideration. Additional (reburning) fuel was injected into the combustion chamber, which was modeled as a plug flow reactor (PFR). The molar flow rates ratio of reburning fuel is assumed to be 5.0%, 7.5%, 10.0%, 12.5% and 15.0% of the whole exhaust. The simulations were conducted for constant pressure equal to 1atm for temperatures range from 600 to 1400 K. It was assumed that a flue gases which enters the reburning zone contains 300 ppm of NO and that during combustion only NO is formed without other NOx. Results show that that gas from sewage sludge gasification gives reburning efficiency of up to 90%. Calculation shows also an optimum value of temperature reburning for gas from sewage sludge gasification which is equal to 1200 K. The type of the sewage sludge has no strong influence on the NO reduction.