Influence of the Temperature and Oxygen Concentration on NOx Reduction In The Natural Gas Reburning Process

Bilbao, Rafael; Millera, Ángela; Alzueta, María U.

doi:10.1021/ie00035a039

Cited by 67 publications

(50 citation statements)

References 14 publications

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“…Under fuel-rich conditions, NO could be decreased by reburn reactions by reacting with hydrocarbon radicals produced during the oxidation of DME and C 2 H 2 [20,[33][34][35]. Under fuel-lean conditions, NO may favor the oxidation of the C 2 H 2 -DME mixture in a mutually sensitized oxidation process, similar to what has been observed for other compounds such as methane [36], ethanol and methanol [37].…”

Section: H 2 -Dme Mixtures Oxidation In the Presence Of Nosupporting

confidence: 54%

Influence of dimethyl ether addition on the oxidation of acetylene in the absence and presence of NO

Marrodán

Berdusán

Aranda

et al. 2016

Fuel

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The use of oxygenated compounds as additives to diesel fuels is considered nowadays as a promising alternative for minimizing soot emissions and maybe also NO x under appropriate conditions [1,2]. Classical oxygenated compounds include alcohols and ethers, and among them, ethanol (C 2 H 5 OH) and dimethyl ether (CH 3 OCH 3 , DME) are two of the most popular candidates to be used as additives. The use of ethanol has been extensively studied in the last years and it is already being used in reformulated gasolines, like E85 (85% ethanol and 15% gasoline) [3]. Similarly, DME has received considerable attention because of its high cetane number, vaporization characteristics, low toxicity, and low tendency to produce smoke and volatile organic compounds (VOCs) [4]. Additionally, DME can be produced from renewable materials [5,6].Ethanol and DME have the same molecular formula (C 2 H 6 O) but different structure and functional group, and, as it has been discussed in several previous works (e.g. [7,8]), the oxygen content and the specific structure of the oxygenated compound strongly influence the capacity for pollutant emission minimization. Song et al. [9] concluded that, under the conditions of their modeling study, both DME and ethanol were effective in reducing aromatic species (important soot precursors). However, DME exhibited a greater effectiveness due to its higher enthalpy of formation, which led to a higher final flame temperature and consequently to a decrease in aromatic species production in premixed flames [10], but also because of its structure. For fuel-rich conditions, the reaction flux analysis conducted by these authors [9] determined that reactions involving DME convert only approximately 15% of its carbon to C 2 -species (key species in the production of aromatic species), whereas reactions of ethanol convert approximately 35% of its carbon to C 2 -species. AbstractDimethyl ether (DME) is a promising diesel fuel additive for reducing soot and NO x emissions, because of its interesting properties and the possibility of a renewable production. An experimental and modeling study of the oxidation of acetylene (C 2 H 2 , considered as an important soot precursor) and DME mixtures has been performed under well-controlled flow reactor conditions. The influence of temperature, air excess ratio (λ) and presence of NO on the oxidation process has been analyzed. Under fuel-rich conditions, the presence of DME in these mixtures modifies the radical pool delaying the acetylene consumption. C 2 H 2 and DME, and the radicals generated in their conversion, interact with NO achieving different levels of NO concentration diminution depending upon the operating conditions. Under fuel-lean conditions, the presence of DME in the mixtures increases the NO diminution, whereas for the other values of λ considered, the maximum NO decrease reached is lower than that obtained in the case of pure acetylene.

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Section: H 2 -Dme Mixtures Oxidation In the Presence Of Nosupporting

confidence: 54%

Influence of dimethyl ether addition on the oxidation of acetylene in the absence and presence of NO

Marrodán

Berdusán

Aranda

et al. 2016

Fuel

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“…Additionally, soot may represent a fouling problem in many combustion devices. Apart from the undesired effects of soot, it has also been mentioned to be interesting as a possible NO x reduction agent [3]. In summary, soot formation can be desirable within the combustion chamber, because it favors heat transfer due to its high radiation capacity and because it may reduce the NO levels, but soot particles should be eliminated before exiting the combustion device.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of the soot formed in the pyrolysis of acetylene

Mendiara

Domene

Millera

et al. 2005

Journal of Analytical and Applied Pyrolysis

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“…The thermal NO X production rate is known to double for every 901C of temperature increase beyond 19271C [19]. Figure 11 shows the experimental results on initial NO X emission level for various oxygen enrichment ratios (o).…”

Section: Casementioning

confidence: 99%

Experimental study of fuel-lean reburn system for NOX reduction and CO emission in oxygen-enhanced combustion

Kim

Baek

2010

Int. J. Energy Res.

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A fuel-lean reburn system is found here to be able to replace a conventional reburning technique in terms of increasing efficiency. In the fuel-lean reburn system, the amount of injected reburn fuel into the reburning zone is low enough to maintain the overall fuel-lean condition in the furnace, so that no additional air system is required, and CO emission can be maintained at almost zero level. In this study, an experimental study has been done to examine the reduction characteristics of NO X in a lab scale combustor (15 kW) with various oxygen-enhanced combustion conditions. Liquefied Petroleum Gas (LPG) was used as a main fuel and reburn fuel. Finally, the current fuel-lean reburn system, even with only an amount of reburn fuel of 13% of total heat input, was observed to achieve a maximum of 48% in NO X reduction.

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Influence of the Temperature and Oxygen Concentration on NOx Reduction In The Natural Gas Reburning Process

Cited by 67 publications

References 14 publications

Influence of dimethyl ether addition on the oxidation of acetylene in the absence and presence of NO

Influence of dimethyl ether addition on the oxidation of acetylene in the absence and presence of NO

An experimental study of the soot formed in the pyrolysis of acetylene

Experimental study of fuel-lean reburn system for NOX reduction and CO emission in oxygen-enhanced combustion

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