Abstract
Reliable prediction of NO<sub>x</sub> emissions can provide useful information for boiler design and fuel selection. Recently used kinetic prediction models for FBC boilers are overly complex and require large computing capacity. Even so, there are many uncertainties in the case of FBC boilers. An empirical modeling approach for NO<sub>x</sub> prediction has been used exclusively for PCC boilers. No reference is available for modifying this method for FBC conditions. This paper presents possible advantages of empirical modeling based prediction of NO<sub>x</sub> emissions for FBC boilers, together with a discussion of its limitations. Empirical models are reviewed, and are applied to operation data from FBC boilers used for combusting Czech lignite coal or coal-biomass mixtures. Modifications to the model are proposed in accordance with theoretical knowledge and prediction accuracy.
Highlights
Fluidized bed combustion (FBC) technology provides an efficient and ecological way for low quality fuel combustion
A much simpler approach can be found for pulverized coal combustors (PCC), where the application of empirical models leads to very simple correlations that can achieve good agreement with experiments
With careful choice of input parameters and constants, empirical modelling can be in very good agreement with experimental data while keeping the model simple and the input data easy to obtain
Summary
Fluidized bed combustion (FBC) technology provides an efficient and ecological way for low quality fuel combustion. Nitrogen oxides NO and NO2 (referred to as NOX) are pollutant gases that cause photochemical smog, respiratory problems and damage to organisms Emissions of these gases are monitored and must be kept at a minimal level. A much simpler approach can be found for pulverized coal combustors (PCC), where the application of empirical models leads to very simple correlations that can achieve good agreement with experiments. These correlations are used exclusively for PCC, and no reference is available for modifying this method for FBC conditions [1, 2]
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