Emission control of nitrogen oxides in the oxy-fuel process

Normann, Fredrik; Andersson, Klas; Leckner, Bo G; Johnsson, Filip

doi:10.1016/j.pecs.2009.04.002

Cited by 257 publications

(150 citation statements)

References 35 publications

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“…Different NO x removal methods have been intensively investigated, and these methods can be differentiated into two main groups: primary and secondary measures [1,2]. In primary measures, the combustion process is modified to obtain proper reducing conditions.…”

Section: Introductionmentioning

confidence: 99%

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Investigations of the reduction of NO to N2 by reaction with Fe under fuel-rich and oxidative atmosphere

Lasek

2014

Heat Mass Transfer

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The limitation of nitrogen oxides (NO x ) emissions from stationary combustion chambers is still an important issue in the field of the natural environment protection. This paper describes the reduction of NO x in the presence of iron. A few new aspects of research describing the utilization of iron as an additive that influences NO x reduction at high temperatures are presented. In particular, the influence of the excess air number (k) on the NO x removal efficiency in the presence of Armco iron was determined. A [50 % increase in the efficiency was achieved at k = 0.6. The research was conducted using N 2 / NO mixed with a flue gas from carbon monoxide combustion. In addition, a correction factor (Arrhenius-type empirical equation) was determined, which enabled the calculation of the oxygen influence on the inhibition of the de-NO x reaction in the presence of iron. The NO x reduction was also tested using bearing steel samples. Finally, the use of iron in de-NO x processes under different combustion conditions is briefly reviewed and analyzed.

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Section: Introductionmentioning

confidence: 99%

“…The development of advanced low-emission methods (e.g., oxy-fuel combustion [1,3,4] or synergetic gasificationcombustion systems [5]) will eventually decrease pollutant emissions (including NO x ). However, a current important problem is the abatement of NO x emissions from traditional air-fired combustion chambers.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the reduction of NO to N2 by reaction with Fe under fuel-rich and oxidative atmosphere

Lasek

2014

Heat Mass Transfer

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“…When referring to 24h average concentrations, as shown in [16]. The percentage of NO X from fuel combustion is the largest, accounting for more than 30%, 70% of which comes from the direct combustion of coal.…”

Section: A Analysis Of the Rates Of Contribution To So 2 Of Key Pollmentioning

confidence: 99%

Using Numerical Simulation Technology to Assess the Contribution of Key Polluters to Air Pollution in the Huancui District, Weihai, China

Chi¹,

Jia²,

Zhong³

et al. 2017

IJESD

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Abstract-We used observational data and numerical simulation technology for evaluating the rate at which that key polluters contribute to air pollutants in the Huancui district of the city of Weihai, China. We evaluated air quality monitoring data, meteorological data, high-altitude sounding data and the emissions intensity of key polluters as provided by the Shandong Provincial Department of Environmental Protection. We adopted the Aermod System, an atmospheric environmental impact assessment system, to simulate pollutant concentrations released from key polluters at each monitoring point in Weihai. Then, we compared the results with values from each monitoring point established by the Department of Environmental Protection of Shandong Province. The results showed the rates that key polluters contribute to air pollutants in the city of Weihai. The analysis concluded that contribution rates of sulphur dioxide and nitrogen oxides from key polluters in the Huancui district of Weihai were higher in the Huaxia Technical School zone at 32.72% and 81.39%, respectively, while they were lower for the remaining five monitoring sites. This study provides data support for the relevant government departments alongside a simple and convinient method to use for related research by using existing official monitoring statistics.

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“…NO x are formed along three routes: thermal and prompt formation from N 2 and oxidation of fuel-bound nitrogen. Thermal NO evolves from the recombination of N 2 and O 2 , described by the extended Zeldovivch mechanism (Norman et al, 2009):…”

Section: Reburningmentioning

confidence: 99%

“…The Zeldovivch mechanism is reversible and reduces NO when the equilibrium concentration of NO is low enough, given that the temperature is sufficiently high for the Zeldovivch mechanism to be active. Prompt NO (Norman et al, 2009) is initiated by the reaction between N 2 and hydrocarbon radicals forming a volatile-N (an intermediate gaseous compound) species, which is oxidised to NO or reduced back to N 2 . Prompt NO is of minor importance and occurs predominantly under fuel-rich conditions.…”

Section: Reburningmentioning

confidence: 99%

Estimation of reburning potential of syngas from sewage sludge gasification process

Werle¹

2011

Chemical and Process Engineering

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The motivation of this work was to define the reburning potential of sewage sludge gasification gas (syngas). Numerical simulation of co-combustion process of syngas in hard coal-fired boiler has been done. All the calculations were performed using the Chemkin program. Plug-Flow Reactor model was used. The calculations were modelled using GRI-Mech 2.11 mechanism. The highest NO conversions are obtained at the temperature of about 1000-1200 K. The highest reduction efficiency was achieved for the molar flow ratio of syngas equal to 15%. The combustion of hard coal with sewage sludge -derived syngas reduces NO emissions and the amount of coal needed to produce electricity and heat. Advanced reburning, which is a more complicated process gives efficiency of up to 80%. The calculations show that the analyzed syngas can yield better results.

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Emission control of nitrogen oxides in the oxy-fuel process

Cited by 257 publications

References 35 publications

Investigations of the reduction of NO to N2 by reaction with Fe under fuel-rich and oxidative atmosphere

Investigations of the reduction of NO to N2 by reaction with Fe under fuel-rich and oxidative atmosphere

Using Numerical Simulation Technology to Assess the Contribution of Key Polluters to Air Pollution in the Huancui District, Weihai, China

Estimation of reburning potential of syngas from sewage sludge gasification process

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