The influence of SO2 level and operating conditions on NOx and N2O emissions during fluidised bed combustion of coals

Miccio, Francesco; Löffler, G.; Wargadalam, Verina J.; Winter, Franz

doi:10.1016/s0016-2361(01)00029-1

Cited by 29 publications

(9 citation statements)

References 15 publications

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“…At higher temperature zones, the formation of SO 2 can significantly affect flame behaviour, 70,71 which was more evident in the presence of CO as it is reported that SO 2 inhibits the CO burnout rate. 72,73 Investigation on a bench-scale natural gas-fired 26 kW burner showed a clear decreasing trend in terms of CO emissions when 100 ppm SO 2 was added under sub-stoichiometric conditions. 34 Sulfur species can also decrease the NO levels in post-flame regions.…”

Section: So 2 Emissionsmentioning

confidence: 99%

Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

et al. 2018

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In oxy‐fuel combustion, fuel is burned using oxygen together with recycled flue gas, which is needed to control the combustion temperature. This leads to higher concentrations of sulfur dioxide and sulfur trioxide in the recycled gas, which can result in the formation of sulfuric acid and enhanced corrosion. Current experimental data on SO3 formation, reaction mechanisms, and mathematical modelling have indicated significant differences in SO3 formation between air‐ and oxy‐fuel combustion for both the wet and dry flue gas recycle options. This paper provides an extensive review of sulfur trioxide formation in air‐ and oxy‐fuel combustion environments, with an emphasis on coal‐fired systems. The first part summarizes recent findings on oxy‐fuel combustion experiments, as they affect sulfur trioxide formation. In the second part, the review focuses on sulfur trioxide formation mechanisms, and the influence of catalysis on sulfur trioxide formation. Finally, the current methods for measuring sulfur trioxide concentration are also reviewed along with the major difficulties associated with those measurements using data available from both bench‐ and pilot‐scale units. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: So 2 Emissionsmentioning

confidence: 99%

Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

et al. 2018

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“…CaO enhances the NO emission owing to the formation of N–Ca intermediates that function to direct the conversion of fuel-N to NO . The selectivity for HCN and NH 3 oxidation to form NO is increased in the presence of CaO . However, the amount of carboxylic and hydrocarbonyl radicals formed by thermal decomposition of MCMA increases at higher Ca/S ratios, which improves the reduction reactions of NO with these radicals, resulting in higher De-NO ratios.…”

Section: Resultsmentioning

confidence: 99%

“…24 The selectivity for HCN and NH 3 oxidation to form NO is increased in the presence of CaO. 25 However, the amount of carboxylic and hydrocarbonyl radicals formed by thermal decomposition of MCMA increases at higher Ca/S ratios, which improves the reduction reactions of NO with these radicals, resulting in higher De-NO ratios. The minimum NO emission occurs at a Ca/S ratio of 3.0.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Utilization of an Organic Calcium Compound to Reduce SO₂ and NO Emissions from Sewage Sludge Combustion

2018

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To remove gas pollutant emissions from sewage sludge combustion, modified calcium magnesium acetate (MCMA) was used as an organic calcium compound (OCC) to blend with sludge. The main objective of this study was to determine the pollutant emission characteristics of sewage sludge and fuel blended with MCMA during combustion in a tube furnace. The effects of operating parameters on the mean SO2 and NO emissions and the reduction ratios of SO2 and NO were investigated. The results showed that MCMA simultaneously captured 69.9% of SO2 and 31.3% of NO at a temperature of 800 °C and a Ca/S molar ratio of 2.0. Furthermore, the Ca/S ratio and reaction temperature significantly impacted the mean SO2 emission and SO2 reduction ratio. The SO2 reduction ratio increased with increases of the Ca/S ratio and temperature. However, SO2 emission decreased with increasing Ca/S ratio but increased with increasing reaction temperature. In addition to the main effects corresponding to single factors, the interaction effect of air flow rate and Ca/S ratio was a dominant factor that affected the mean NO emission and NO reduction ratio.

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“…Higher bed temperatures and excess air, for example, would lead to an increase in NOx emission. 17,18 For NOx reduction, stage combustion and flue gas recirculation are widely used strategies, 19,20 but in some cases, the results are not satisfactory. 21 The combustion fraction, which is an index to determine the main combustion region in a furnace, has been seldom discussed in previous studies, but it is crucial for the arrangement of the heat exchanger surface.…”

Section: Introductionmentioning

confidence: 99%

The Combustion Performance of Pelletized Jatropha Seed Residue in a Vortexing Fluidized-Bed Combustor

Chyang

2015

Energy Fuels

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Jatropha curcas is considered a promising energy crop. The response surface methodology is introduced to study the combustion performance of pelletized Jatropha seed residue in a vortexing fluidized-bed combustor, and regression models for the bed temperature (T b), the combustion fraction (Y b), and the NOx emissions are provided. The result shows that the combustion efficiency is above 99.5%, indicating that JSR pellets burn very well in the combustor. CO can be eliminated by stage combustion accompanied by a controlled freeboard temperature, but NOx increases correspondingly. T b and Y b have similar trends, showing the interaction between them. The variation in the NOx emissions can be attributed to the shift in volatile-N combustion. In summary, the optimum operating conditions lie slightly above the line of T b equal to 800 °C.

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The influence of SO2 level and operating conditions on NOx and N2O emissions during fluidised bed combustion of coals

Cited by 29 publications

References 15 publications

Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

Utilization of an Organic Calcium Compound to Reduce SO₂ and NO Emissions from Sewage Sludge Combustion

The Combustion Performance of Pelletized Jatropha Seed Residue in a Vortexing Fluidized-Bed Combustor

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The influence of SO2 level and operating conditions on NOx and N2O emissions during fluidised bed combustion of coals

Cited by 29 publications

References 15 publications

Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

Utilization of an Organic Calcium Compound to Reduce SO2 and NO Emissions from Sewage Sludge Combustion

The Combustion Performance of Pelletized Jatropha Seed Residue in a Vortexing Fluidized-Bed Combustor

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Utilization of an Organic Calcium Compound to Reduce SO₂ and NO Emissions from Sewage Sludge Combustion