Title: Computational modelling of NO_x removal by selective non-catalytic reduction

Authors: M. Tayyeb Javed, Naseem Irfan

Addresses: Department of Chemical and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore Islamabad, Pakistan. ' Department of Chemical and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore Islamabad, Pakistan

Abstract: This paper presents the results of computational kinetic modelling of the removal of nitrogen oxides (NO_x) from flue gases by selective non-catalytic reduction (SNCR) process using urea as a reducing agent. CHEMKIN and SENKIN computer codes were used with latest reaction mechanism parameters for simulated conditions in an isothermal plug flow reactor. Flue gas initial conditions were simulated as 70 litres/min propane containing 500 ppm background NO_x. A range of molar ratios was studied at optimum temperature. Carbon monoxide and hydrogen were investigated as potential enhancers to lower the temperature window. The modelling results suggested that the optimum temperature for peak reduction was around 1075°C with optimum molar ratios of 1.5. Hydrogen was found to be an efficient enhancer. The optimum residence time was found to be about 80 milliseconds.

Keywords: air pollution; nitrogen oxides; selective non-catalytic reduction; simulation; urea deNO_x; environmental pollution; kinetic modelling; flue gases; NO_x removal; isothermal plug flow reactors; modelling.

DOI: 10.1504/IJEP.2007.014235

International Journal of Environment and Pollution, 2007 Vol.29 No.4, pp.495 - 504

Published online: 26 Jun 2007 *

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