Study on the Combustion Process of Premixed Methane Flames with CO2 Dilution at Elevated Pressures

Ślefarski, Rafał

doi:10.3390/en12030348

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…The PFM can compute species and temperature profiles in steady-state burner-stabilized premixed laminar flames. Figure 3 gives the predicted results of three cases: PFR model and GRI-Mech 3.0 reaction mechanism, PFR model and updated Glarborg reaction mechanism, PFM model and GRI-Mech 3.0 reaction mechanism [45]. The calculation was conducted under the SR of 0.7 and the reaction temperature varying from 1200 to 1800 • C; the other conditions are listed in Table 1.…”

Section: Model Validationmentioning

confidence: 99%

NOx Emissions and Nitrogen Fate at High Temperatures in Staged Combustion

Che

Wang

et al. 2020

Energies

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Staged combustion is an effective technology to control NOx emissions for coal-fired boilers. In this paper, the characteristics of NOx emissions under a high temperature and strong reducing atmosphere conditions in staged air and O2/CO2 combustion were investigated by CHEMKIN. A methane flame doped with ammonia and hydrogen cyanide in a tandem-type tube furnace was simulated to detect the effects of combustion temperature and stoichiometric ratio on NOx emissions. Mechanism analysis was performed to identify the elementary steps for NOx formation and reduction at high temperatures. The results indicate that in both air and O2/CO2 staged combustion, the conversion ratios of fuel-N to NOx at the main combustion zone exit increase as the stoichiometric ratio rises, and they are slightly affected by the combustion temperature. The conversion ratios at the burnout zone exit decrease with the increasing stoichiometric ratio at low temperatures, and they are much higher than those at the main combustion zone exit. A lot of nitrogen compounds remain in the exhaust of the main combustion zone and are oxidized to NOx after the injection of a secondary gas. Staged combustion can lower NOx emissions remarkably, especially under a high temperature (≥1600 °C) and strong reducing atmosphere (SR ≤ 0.8) conditions. Increasing the combustion temperature under strong reducing atmosphere conditions can raise the H atom concentration and change the radical pool composition and size, which facilitate the reduction of NO to N2. Ultimately, the increased OH/H ratio in staged O2/CO2 combustion offsets part of the reducibility, resulting in the final NOx emissions being higher than those in air combustion under the same conditions.

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Section: Model Validationmentioning

confidence: 99%

NOx Emissions and Nitrogen Fate at High Temperatures in Staged Combustion

Che

Wang

et al. 2020

Energies

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“…This method is based on the assumption that the calorific value of the fuel is equal to the sum of the product of the individual components in the compound calorific value and their percentage content in the fuel. This method allows obtaining an approximate value, because it was assumed that the elements appear as single ones and does not take into account the fact that they occur in the fuel in the form of chemical compounds that have their heat of creation affecting the value of the calorific value [1,[3][4][5][6][7][8][9][10]12]. These methods obtain the highest accuracy of calorific value determination for hard coal.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Construction for the Combustion Chamber of the Gas Calorimeter in the Aspect of Exhaust Gas Homogenization in the Measuring Space

et al. 2022

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The assessment of the physicochemical parameters of fuels is particularly important in energy generation processes implemented using combustion processes. The calorific value of the fuels used is important in these processes. The calorific value of fuel is the basic parameter from which the mass of fuel necessary to generate a certain amount of energy results. Calorimeters are used to determine the calorific value of fuels. The subject of analyzes is the conceptual design of the calorimeter for gaseous fuel testing. A special element in the construction of the calorimeter is the combustion chamber. In its initial part, the gaseous fuel oxidation process is carried out, and in the final part, the required parameters are measured. In order to obtain high accuracy in the measurement of selected thermodynamic parameters, it is necessary to ensure homogeneity of the exhaust gases flowing in the measurement space. For this purpose, the construction of the combustion chamber was developed and simulation tests aimed at homogenization of exhaust gases in the chamber measuring space were carried out. An example of the construction and the tests carried out are provided in this article.

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“…The experimental data were compared with empirical correlations and chemical mechanisms. A paper concerning about turbulent premixed methane flame diluted by carbon dioxide at atmospheric and elevated pressures can be published by Slefarski (2019). The influences of fluid properties and operation parameters on the emission of NOx, CO and flame properties were investigated numerically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Kütle debisi ve denklik oranlarının önkarışımlı laminer metan-hava karışımı alevi üzerine etkileri

Atmaca

2021

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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The structures of laminar premixed flames of methane air mixture are investigated for different equivalence ratios and different mass fluxes numerically. Equivalence ratio values are taken as 0.6, 1 and 1.4 that can be seen in engineering applications. These values correspond to lean, stoichiometric and rich methane-air mixtures respectively. CHEMKIN 19 program and GRI-Mech 3.0 mechanism are used for numerical solution. The axial velocity and mole fractions of CH4 and O2 as reactants, and mole fractions of H2O, CO, CO2 and H2 as products are investigated for each runs. It is found that with the increase of the mass flow rate; the axial velocities of the flame, the axial location of the reaction zones and the mole fraction values of the intermediates increases. The values of the mole fractions of the reactants do not change with mass flux.

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Study on the Combustion Process of Premixed Methane Flames with CO2 Dilution at Elevated Pressures

Cited by 8 publications

References 21 publications

NOx Emissions and Nitrogen Fate at High Temperatures in Staged Combustion

NOx Emissions and Nitrogen Fate at High Temperatures in Staged Combustion

Modeling of the Construction for the Combustion Chamber of the Gas Calorimeter in the Aspect of Exhaust Gas Homogenization in the Measuring Space

Kütle debisi ve denklik oranlarının önkarışımlı laminer metan-hava karışımı alevi üzerine etkileri

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