NOx

The effect of natural gas composition and atmospheric humidity on premixed combustion across the regions of Colombia

As a tropical and highly mountainous country, Colombia has varying levels of atmospheric humidity across its regions. These humidity levels affect combustion parameters in premixed combustion systems such as laminar burning velocity, adiabatic flame temperature, and pollutant emissions. The greatest effect of water in the reaction zone is the reduction of NOx formation (at equilibrium) by up to 40% through the thermal mechanism for lean mixtures. The laminar burning velocity is reduced by up to 25% at an equivalence ratio of 0.5 and a molar moisture content of 3.5%.

Exploring Computational Methods for Predicting Pollutant Emissions and Stability Performance of Premixed Reactions Stabilized by a Low Swirl Injector

This article addresses the numerical modeling of NOx emissions and lean blowoff (LBO) limits of confined and pressurized turbulent premixed flames stabilized with a low swirl burner. The study also evaluates existing numerical methods that can be used to predict exhaust pollutant emissions and reaction instability close to the LBO limit. One of the strategies presented in the article consists of establishing a chemical reactor network (CRN), which is a simplified model of the fluid dynamics and energy balance of the system coupled with a detailed reaction mechanism.

Coal combustion modelling of large power plant, for NOx abatement

This paper presents the comparison of experimental results and computational fluid dynamics (CFD) simulations for a 600 MWe industrial pulverised coal power station. The power station measurements were made in a normal combustion mode and in an overfire air (OFA) mode. The agreement between the model and the data collected in the chimney is good; the NOx reduction modelled is in agreement with the measured one, but data taken in the flame show that the flame structure is imperfectly represented.