NO -emissions from flameless coal combustion in air, Ar/O2 and CO2/O2

Stadler, Hannes; Ristic, Dragisa; Förster, Malte; Schuster, A. K.; Kneer, Reinhold; Scheffknecht, Günter

doi:10.1016/j.proci.2008.06.025

Cited by 117 publications

(77 citation statements)

References 10 publications

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“…Weber et al [70,71] and Zhang et al [49] investigated the MILD combustion of the pulverized-coal fuel and confirmed the possibility of occurrence of coal MILD combustion. Stadler et al [72,73] investigated the formation mechanisms of NO x for coal combustion under the MILD mode and, especially, the influence of char combustion and gasification on NO x formation. Recently Dally et al [22] have successfully achieved MILD combustion of firing sawdust in a lab-scale furnace.…”

Section: The Origin Of Mild Combustion Technologymentioning

confidence: 99%

“…Stadler et al [72] developed a high speed injection oxy-fuel burner for a 100 kWe experiment setup and successfully achieved stable combustion under 18% oxygen volume concentration. Blasiak et al [29][30][31][32][33][34][35] conducted numerical simulation and experimental investigation about NO x and CO 2 emission reduction.…”

Section: Mild Oxy-fuel Combustion Systemmentioning

confidence: 99%

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Progress and recent trend in MILD combustion

Dally

et al. 2011

Sci. China Technol. Sci.

146

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Moderate or intense low oxygen dilution (MILD) combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs. However, due to the lack of the fundamental knowledge on this combustion, there is a misconception that MILD combustion should be established by high preheating of the air, which has limited its application. Our research and development on this combustion has been performed for several years. We have found that the requirements for establishing the MILD combustion are more relaxed than previously. It is also revealed that this combustion of different type, i.e., non-premixed, partially premixed and fully premixed, can be achieved by firing various fuels (i.e., gaseous, liquid and solid fuels). It is suggested that the application of the MILD combustion can be expanded significantly. The present review summarizes the progress and recent trend made in the R&D of this combustion and recommends further fundamental studies for improving our knowledge and widening its applications. high temperature air combustion, flameless oxidation, flameless combustion, oxy-fuel combustion Citation: Li P F, Mi J C, Dally B B, et al. Progress and recent trend in MILD combustion.

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Section: The Origin Of Mild Combustion Technologymentioning

confidence: 99%

Section: Mild Oxy-fuel Combustion Systemmentioning

confidence: 99%

Progress and recent trend in MILD combustion

Dally

et al. 2011

Sci. China Technol. Sci.

146

View full text Add to dashboard Cite

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“…However, the thermal histories of coal particles in the experimental facilities can be different from that in the actual large scale boilers because the scale of flame can affect the heat transfer mechanism of the coal particles. Experimental apparatus with various sizes, e. g., the drop tube furnace (8-60 g-coal/h) [21,22], the small coal jet burner (0.5 kg-coal/h) [11,23], the triple stream burner (0.36-2.16 kg-coal/h) [24,25], the RWTH furnace (6-7 kg-coal/h) [26,27], the RWEn Combustion Test Facility (70 kg-coal/h) [28], the BEACH furnace (100 kg-coal/h) [13,29,30,31], the IFRF furnace No. 1 (260 kg-coal/h) [32] and the MARINE furnace (300 kg-coal/h) [19,33], have been used to investigate the coal combustion phenomena or to evaluate the combustion characteristics of various coal brands by some researchers.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Hashimoto

Watanabe

2016

Fuel Processing Technology

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To investigate the effect of the furnace scale on the heat transfer mechanism of coal particles, numerical simulations of coal combustion fields in three different scale furnaces (915 MW th actual large scale boiler, 2.4 MW th and 0.76 MW th test furnaces) were conducted. High accuracy of simulation methods was validated with the measured data. From the comparison of numerical simulations between three different scale furnaces, it was clarified that the particle residence time with high particle temperature for a small scale furnace is shorter than that for a large scale furnace even if the particle residence time passing the high temperature gas is the same. This is caused by the insufficient heat gain of particles for a small scale furnace due to the lower radiation heat transfer because of the thinner flame thickness in the small furnace. The sphericity of ash particles from small scale furnaces is lower than that for large scale furnaces due to the shorter particle residence time with high particle temperature. These findings should be considered when the usability of coal brands for actual large scale boilers is evaluated by the fly ash properties from a small scale experimental furnace.

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“…The MILD combustion of gaseous [4][5][6][7][8][9][10][11][12][13], liquid [14,15] and solid fuels [15][16][17] has been investigated, and it has been combined with oxy-fuel combustion technology to develop "zero emission" combustion system (including carbon capture and sequestration) for fossil fuels utilization [18,19]. No matter what fuels are used, or it is integrated with what technology, hot exhaust gas recirculation is always the key to achieve and maintain stable MILD combustion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Inlet Dilution of Reactants on Premixed Combustion in a Recuperative Furnace

2011

Flow Turbulence Combust

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This paper presents a numerical study by RANS modeling that investigates the effect of external dilution on the premixed combustion occurring in a recuperative furnace. Calculations are performed using the detailed GRI-Mech 3.0 mechanism to ensure the accuracy of the modeling. Results of the in-furnace flow, temperature, and concentrations of OH, O 2 , CO 2 and NO x are provided. It is found that the external dilution with the inert gas CO 2 plays a significant role in establishing the premixed MILD (Moderate or Intense Low-oxygen Dilution) combustion. Externally diluting the reactant mixture not only reduces the initial concentration of O 2 but also ensures a stronger internal dilution by recirculation of more hot combustion products. Importantly, the latter effect is more significant for achieving the MILD regime. There is a critical mass fraction of the diluent CO 2 present, below which MILD combustion cannot occur. While the traditional premixed flame produces much more NO x than the MILD combustion, the emission of NO x appears to result most from the thermal-NO route and least from the N 2 O route no matter which mode occurs. Moreover, the present simulation demonstrates that the MILD mode occurs over a wider range of initial reactant conditions for premixed combustion than for diffusion combustion.

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NO -emissions from flameless coal combustion in air, Ar/O2 and CO2/O2

Cited by 117 publications

References 10 publications

Progress and recent trend in MILD combustion

Progress and recent trend in MILD combustion

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Influence of Inlet Dilution of Reactants on Premixed Combustion in a Recuperative Furnace

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