The effect of sulfur on the thermal DeNOx process

Silver, Joel A.

doi:10.1016/0010-2180(83)90002-0

Cited by 20 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The SNCR process is known to be strongly temperature dependent, with a narrow temperature window of effective NO reduction, typically located around 850–1100 °C. The process has been studied extensively in the past and is considered a mature technology for NO x reduction in stationary sources. , Previous studies have shown that important process parameters for SNCR include temperature, residence time, injection rate of the chemical reducing agent, mixing of reagent with the flue gas, , oxygen concentration, , and presence of combustibles. − Also the impact of alkali metals − and SO 2 has been investigated. − …”

Section: Introductionmentioning

confidence: 99%

Selective Noncatalytic Reduction of NO_x Using Ammonium Sulfate

Krum

Jensen

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

Ammonium sulfate (AS) is of interest as an additive in stationary combustion plants for the simultaneous control of NO x (through selective noncatalytic reduction, SNCR) and deposition and corrosion (through sulfation of alkali chlorides). The SNCR performance of ammonium sulfate was evaluated through experiments in a laboratory-scale flow reactor. Experiments with 5 and 10 wt % aqueous ammonium sulfate solutions, corresponding to AS/NO ratios above 1, yielded NO reductions up to 95% in a temperature interval of 1025–1075 °C. The results indicated that sulfur from ammonium sulfate is mainly released as SO3, even though SO2 is detected in increasing concentrations at temperatures above 1000 °C. Addition of KCl to the SNCR process was shown to promote the reaction at lower temperatures, extending the temperature window for reduction by 50 °C. Furthermore, ammonium sulfate facilitated a high degree of KCl sulfation at or below 1000 °C, demonstrating the potential of using ammonium sulfate to simultaneously reduce NO x and corrosion in full-scale combustion plants. The experiments were analyzed in terms of a detailed kinetic model. The SNCR experiments using ammonium sulfate were described satisfactorily by the model, although the NO reduction at the optimum was slightly underestimated. Also, the sulfation of KCl was captured well, but the promoting effect of KCl on SNCR with ammonium sulfate was greatly underestimated. Possible reasons for this discrepancy were discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Selective Noncatalytic Reduction of NO_x Using Ammonium Sulfate

Krum

Jensen

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The presence of SO 2 affects the oxidation selectivity towards the products NO and N 2 [1]. Also, the selective non-catalytic reduction of NO (SNCR) by NH 3 is sensitive towards the concentration of SO 2 [9][10][11][12], which is in part due to the influence of SO 2 on the general pool of radicals such as OH, H and O, but NH x + SO 2 reactions may also contribute.…”

Section: Introductionmentioning

confidence: 99%

The Reaction Kinetics of Amino Radicals with Sulfur Dioxide

Gao¹,

Glarborg

Marshall

2015

Zeitschrift Für Physikalische Chemie

View full text Add to dashboard Cite

show abstract

Kinetic modeling of the reduction of nitric oxide in combustion products by isocyanic acid

Miller

Bowman

1991

Int J of Chemical Kinetics

168

108

View full text Add to dashboard Cite

The RAPRENO, process for NO reduction in combustion products involves reaction of nitric oxide with isocyanic acid. We have developed a mechanism for the gas-phase reaction of isocyanic acid with nitric oxide in the presence of various amounts of 0 2 , H20, and CO. Kinetics calculations using the mechanism are compared with the experimental data of Siebers and Caton, and the model reproduces all trends of these data. Sensitivity and rate-of-production analyses show that the reactions of HNCO with OH, 0, and H play a major role in the NOremoval process and that NO removal occurs primarily by reaction of NO with NCO to form NzO, which subsequently reacts slowly to form NP. The overall reaction is critically dependent on production of radicals. When 02, H20, and CO are present, the radicals are supplied by the moist-CO chain branching sequence. When any of these species is absent, radicals must be supplied by other reactions, principally the NzO decomposition reaction and the reaction of the NH, radical with NO.

show abstract

The effect of sulfur on the thermal DeNOx process

Cited by 20 publications

References 19 publications

Selective Noncatalytic Reduction of NO_x Using Ammonium Sulfate

Selective Noncatalytic Reduction of NO_x Using Ammonium Sulfate

The Reaction Kinetics of Amino Radicals with Sulfur Dioxide

Kinetic modeling of the reduction of nitric oxide in combustion products by isocyanic acid

Contact Info

Product

Resources

About

The effect of sulfur on the thermal DeNOx process

Cited by 20 publications

References 19 publications

Selective Noncatalytic Reduction of NOx Using Ammonium Sulfate

Selective Noncatalytic Reduction of NOx Using Ammonium Sulfate

The Reaction Kinetics of Amino Radicals with Sulfur Dioxide

Kinetic modeling of the reduction of nitric oxide in combustion products by isocyanic acid

Contact Info

Product

Resources

About

Selective Noncatalytic Reduction of NO_x Using Ammonium Sulfate

Selective Noncatalytic Reduction of NO_x Using Ammonium Sulfate