A detailed kinetic mechanism including methanol and nitrogen pollutants relevant to the gas-phase combustion and pyrolysis of biomass-derived fuels

Zabetta, Edgardo Coda; Hupa, Mikko

doi:10.1016/j.combustflame.2007.06.022

Cited by 67 publications

(42 citation statements)

References 21 publications

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“…8a and 8b. The mechanism by Zabetta and Hupa [45], similar to that of Li et al [43], also predicts shorter ignition delays compared to the experiments. Comparative performance of the two mechanisms will be presented later.…”

Section: Computations and Sensitivity Analysissupporting

confidence: 53%

“…8a, i.e., P C = 30 bar, T C = 905 K, and φ = 1.0. Again, this mechanism, has been under development for several years, is well validated and is one of the seed mechanisms for the scheme by Zabetta and Hupa [45].…”

Section: Figurementioning

confidence: 97%

“…This mechanism was compiled by assembling several reaction subsets from different parent mechanisms, including the methanol oxidation mechanism systematically developed by Dryer and coworkers at Princeton University over the past decade. The mechanism by Zabetta and Hupa [45], while developed for combustion and pyrolysis of biomass-derived fuels, also takes into account the nitrogen chemistry.…”

Section: Kinetic Mechanismsmentioning

confidence: 99%

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Autoignition of methanol: Experiments and computations

Kumar

Sung

2011

Int J of Chemical Kinetics

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An experimental and computational investigation into the autoignition of methanol under high-pressure and low-to-intermediate temperature conditions is conducted. The ignition delay results have been obtained using a heated rapid compression machine, over a pressure range of 7-30 bar, a temperature range of 850-1100 K, and an equivalence ratio range of 0.25-2.0. Using kinetic schemes recently reported in the literature for the combustion of methanol, the experimental results are compared to computationally obtained values. The kinetic schemes studied are found to significantly underpredict ignition delays for the conditions investigated. A sensitivity analysis of the computed results to reaction rate constants is also conducted. It is shown that the reaction of methanol with HO 2 radical is critical to the predicted values of ignition delays under the current experimental conditions. C

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Section: Computations and Sensitivity Analysissupporting

confidence: 53%

Section: Figurementioning

confidence: 97%

Section: Kinetic Mechanismsmentioning

confidence: 99%

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Autoignition of methanol: Experiments and computations

Kumar

Sung

2011

Int J of Chemical Kinetics

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“…However, the operation range and the overall economics of the plant should be considered before applying such costly methods [16,41,46,47]. Therefore, for small biomass combustion reactors, only primary reduction techniques are considered used in a feasible way.…”

Section: Nox Reduction Pathmentioning

confidence: 99%

Experimental Investigation on NOx Reduction by Primary Measures in Biomass Combustion: Straw, Peat, Sewage Sludge, Forest Residues and Wood Pellets

2012

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An experimental investigation was carried out to study the NO x formation and reduction by primary measures for five types of biomass (straw, peat, sewage sludge, forest residues/Grot, and wood pellets) and their mixtures. To minimize the NO x level in biomass-fired boilers, combustion experiments were performed in a laboratory scale multifuel fixed grate reactor using staged air combustion. Flue gas was extracted to measure final levels of CO, CO 2 , C x H y , O 2 , NO, NO 2 , N 2 O, and other species. The fuel gas compositions between the first and second stage were also monitored. The experiments showed good combustion quality with very low concentrations of unburnt species in the flue gas. Under optimum conditions, a NO x reduction of 50-80% was achieved, where the highest reduction represents the case with the highest fuel-N content. The NO x emission levels were very sensitive to the primary excess air ratio and an optimum value for primary excess air ratio was seen at about 0.9. Conversion of fuel nitrogen to NO x showed great dependency on the initial fuel-N content, where the blend with the highest nitrogen content had lowest conversion rate. Between 1-25% of the fuel-N content is converted to NO x depending on the fuel blend and excess air ratio. Sewage sludge is suggested as a favorable fuel to be blended with straw. It resulted in a higher NO x reduction and low fuel-N conversion to NO x . Tops and branches did not show desirable NO x reduction and made the combustion also more unstable. N 2 O emissions were very low, typically below 5 ppm at 11% O 2 in the dry flue gas, except for mixtures with high nitrogen content, where values up to 20 ppm were observed. The presented results are part of a larger study on OPEN ACCESSEnergies 2012, 5 271 problematic fuels, also considering ash content and corrosive compounds which have been discussed elsewhere.

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“…NO formations in different fuels have been the subject of many studies. NO formations in methane as well as methanol have been well understood [1]- [6]. However, nitric oxide formation in methyl formate has not been studied widely.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Nitric Oxide (NO) Formation in Methane, Methanol and Methyl Formate in different Flow Configurations

Kioni¹,

Tanui²,

Gitahi³

2013

JOCET

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This temperature favours prompt-NO formation, and therefore, a significant difference of the amount of NO (one order of magnitude higher) is observed in CH 4 as compared to oxygenated fuels due to low values of CH and N observed in these fuels (CH 3 OH and CH 3 OCHO). High flame temperatures (approximately 2900 K) due to high initial temperatures are observed in the homogeneous system. Therefore, in homogeneous system it was observed that the amount of NO produced by the three fuels is within the same order of magnitude due to availability of the O atoms and nitrogen molecules (important species in thermal NO mechanism (Zel'dovich mechanism)).Index Terms-Methane, methanol, methyl formate, prompt NO, thermal NO.

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A detailed kinetic mechanism including methanol and nitrogen pollutants relevant to the gas-phase combustion and pyrolysis of biomass-derived fuels

Cited by 67 publications

References 21 publications

Autoignition of methanol: Experiments and computations

Autoignition of methanol: Experiments and computations

Experimental Investigation on NOx Reduction by Primary Measures in Biomass Combustion: Straw, Peat, Sewage Sludge, Forest Residues and Wood Pellets

Numerical Simulations of Nitric Oxide (NO) Formation in Methane, Methanol and Methyl Formate in different Flow Configurations

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