NOx and SO2 Emission During OXY-Coal Combustion

Moroń, Wojciech; Czajka, Krzysztof; Ferens, Wiesław; Babul, Konrad; Szydełko, A.; Rybak, W.

doi:10.2478/cpe-2013-0027

Cited by 8 publications

(5 citation statements)

References 14 publications

(8 reference statements)

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“…This might be attributed to distinct staging of this flame resulting in generally lower flame temperatures and thus a reduced NO formation. The increased NO emissions of both oxy-fuel cases for λ local = 0.8 in comparison to the Air case might be attributed to higher conversion rates of fuel-N to NO for oxy-fuel conditions as reported by Andersson et al [19] and Moron et al [20]. A further reason for this observation might also be unveiled by the chemiluminescence maps: comparing the cases with λ local = 1.0 and λ local = 0.8 for Air (Fig.…”

Section: Discussionmentioning

confidence: 72%

Experimental Investigation and Comparison of Pulverized Coal Combustion in CO2/O2− and N2/O2−Atmospheres

Hees

Zabrodiec

Maßmeyer

et al. 2015

Flow Turbulence Combust

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This paper presents results from measurements of flue gas components and spontaneous emission originated from excited OH-molecules of pulverized coal combustion in air-and CO 2 /O 2 −atmospheres. Measurements were conducted for various local oxygenfuel ratios and O 2 contents of the CO 2 /O 2 −atmosphere. For this purpose a swirl burner (60kW th ) specially designed for oxy-fuel combustion was used. In the present study, measurements in the flame of the swirl burner were performed in a vertical downward fired test furnace. A CCD-camera system was used to capture spontaneous emission of excited OHmolecules. Furthermore, the global flue gas emissions were measured in the stack to gain data for a general description of the combustion process. The measurements were performed for combustion with air and with a premixed oxy-fuel atmosphere. Two different oxy-fuel atmospheres were tested (21 vol.-% O 2 / 79 vol.-% CO 2 and 25 vol.-% O 2 / 75 vol.-% CO 2 ). In addition the oxygen-fuel ratio in the proximity of the burner was varied between 1.0 and 0.6 while the global oxygen-fuel ratio was fixed at 1.3. Global concentrations of CO and NO in the flue gas as well as profiles of the spontaneous emission of OH-molecules are presented and discussed within this paper. Based on these measurements flame structures and flame characteristics are identified.

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Section: Discussionmentioning

confidence: 72%

Experimental Investigation and Comparison of Pulverized Coal Combustion in CO2/O2− and N2/O2−Atmospheres

Hees

Zabrodiec

Maßmeyer

et al. 2015

Flow Turbulence Combust

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“…In light of the information presented in the literature, adsorption on a heterogeneous surface is most often described by the following models: pseudo first-order and pseudo second-order kinetic models (PFO and PSO), intraparticle diffusion model (Weber-Morris), and chemisorption on a heterogeneous surface (Elovich) [13][14][15][16]. However, a commonly used tool for the analysis of empirical data is linear regression, and the classic method of least squares is used to determine the optimal values of unknown parameters [17][18][19][20][21]. Nevertheless, the greatest disadvantage of the above method is the undefined distribution of empirical data errors when determining the parameters of a given model, as a result of transforming kinetic equations into linearized forms.…”

Section: Introductionmentioning

confidence: 99%

Linear and Non-Linear Regression Analysis for the Adsorption Kinetics of SO2 in a Fixed Carbon Bed Reactor—A Case Study

Kisiela-Czajka

Dziejarski

2022

Energies

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Here, we determined the kinetic parameters of SO2 adsorption on unburned carbons from lignite fly ash and activated carbons based on hard coal dust. The model studies were performed using the linear and non-linear regression method for the following models: pseudo first and second order, intraparticle diffusion, and chemisorption on a heterogeneous surface. The quality of the fitting of a given model to empirical data was assessed based on: R2, R, Δq, SSE, ARE, χ2, HYBRID, MPSD, EABS, and SNE. It was clearly shown that the linear regression more accurately reflects the behaviour of the adsorption system, which is consistent with the first-order kinetic reaction—for activated carbons (SO2 + Ar) or chemisorption on a heterogeneous surface—for unburned carbons (SO2 + Ar and SO2 + Ar + H2O(g) + O2) and activated carbons (SO2 + Ar + H2O(g) + O2). Importantly, usually, each of the approaches (linear/non-linear) indicated a different mechanism of the studied phenomenon. A certain universality of the χ2 and HYBRID functions has been proved, the minimization of which repeatedly led to the lowest SNE values for the indicated models. Fitting data by any of the non-linear equations based on the R or R2 functions only cannot be treated as evidence/prerequisite of the existence of a given adsorption mechanism.

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“…In the light of the information presented in the literature, adsorption on a heterogeneous surface is most often described by the following models: pseudo first-order and pseudo second-order kinetic models (PFO and PSO), intraparticle diffusion model (Weber-Morris), and chemisorption on a heterogeneous surface (Elovich) [13][14][15][16]. However, a commonly used tool for the analysis of empirical data is linear regression, and the classic method of least squares is used to determine the optimal values of unknown parameters [17][18][19][20][21]. Nevertheless, the greatest disadvantage of the above method is the undefined distribution of empirical data errors when determining the parameters of a given model, as a result of transforming kinetic equations into linearized forms.…”

Section: Introductionmentioning

confidence: 99%

Linear and Non-linear Regression Analysis for the Adsorption Kinetics of SO<sub>2</sub> in a Fixed Carbon Bed Reactor – A Case Study

Kisiela-Czajka¹,

Dziejarski²

2021

Preprint

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Kinetic parameters of SO2 adsorption on unburned carbons from lignite fly ash and activated carbons based on hard coal dust were determined. The model studies were performed using the linear and non-linear regression method for the following models: pseudo first and second-order, intraparticle diffusion, and chemisorption on a heterogeneous surface. The quality of the fitting of a given model to empirical data was assessed based on: R2, R, Δq, SSE, ARE, χ2, HYBRID, MPSD, EABS, and SNE. It was clearly shown that it is the linear regression that more accurately reflects the behaviour of the adsorption system, which is consistent with the first-order kinetic reaction – for activated carbons (SO2+Ar) or chemisorption on a heterogeneous surface – for unburned carbons (SO2+Ar and SO2+Ar+H2O(g)+O2) and activated carbons (SO2+Ar+H2O(g)+O2). Importantly, usually, each of the approaches (linear/non-linear) indicated a different mechanism of the studied phenomenon. A certain universality of the χ2 and HYBRID functions has been proved, the minimization of which repeatedly led to the lowest SNE values for the indicated models. Fitting data by any of the non-linear equations based on the R or R2 functions only, cannot be treated as evidence/prerequisite of the existence of a given adsorption mechanism.

show abstract

NOx and SO2 Emission During OXY-Coal Combustion

Cited by 8 publications

References 14 publications

Experimental Investigation and Comparison of Pulverized Coal Combustion in CO2/O2− and N2/O2−Atmospheres

Experimental Investigation and Comparison of Pulverized Coal Combustion in CO2/O2− and N2/O2−Atmospheres

Linear and Non-Linear Regression Analysis for the Adsorption Kinetics of SO2 in a Fixed Carbon Bed Reactor—A Case Study

Linear and Non-linear Regression Analysis for the Adsorption Kinetics of SO<sub>2</sub> in a Fixed Carbon Bed Reactor – A Case Study

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