Innovative Technique For The Control Of NOx
Formed In Combustion Processes
Author(s)
N. Verdone, M. Scarsella, G. Liuzzo & P. De Filippis
Abstract
NOx formed in combustion processes is mainly constituted by nitrogen monoxide
(NO) while nitrogen dioxide (NO2) accounts for marginal concentration only.
However, being NO2 characterized by higher water solubility and equilibrium
constant in the neutralization reaction operated with basic reactants, it is easily
removed via dry or wet processes. On this basis an innovative process alternative
to the conventional DeNOx SCR and SNCR can be envisaged, where the
oxidation of NO to NO2 makes the successive abatement of the oxidized fraction
relatively easier. The scope of the work is the study of the oxidation of NO to
NO2, considered as the controlling step of the proposed process, operated with
hydrogen peroxide (H2O2). A mathematical model of the oxidation has been
developed in the Chemkin v. 3.7 environment, describing the gas phase kinetics
in the energy recovery section of a generic combustion process through the
Miller and Bowman (1989) kinetic mechanism. The base model has been
improved with the introduction of the oxidation steps induced by the injection of
hydrogen peroxide drawn from the literature. The NO oxidation reaction was
investigated in a temperature range of 250-700°C, with a 20% excess of
oxidizing agent with respect to the NO/oxidizer oxidation reaction stoichiometry.
The experimental maximum conversion results are less than the calculated one of
about 20%. The results of the model have been validated through experimental
runs conducted in a bench scale pilot plant.
Keywords: DeNOx, flue gas treatment, NOx chemistry.
Keywords
DeNOx, flue gas treatment, NOx chemistry
Related Book
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