Ammonia chemistry in a flameless jet

Zięba, Mariusz; Brink, Anders; Schuster, A. K.; Hupa, Mikko; Scheffknecht, Günter

doi:10.1016/j.combustflame.2009.07.002

Cited by 35 publications

(31 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…National and international R&D of MILD combustion Investigators from Germany [2,[23][24][25][26][27] and Japan [5,6,28] appeared to first conduct the research and development (R&D) on the MILD combustion, followed by those from Sweden [29][30][31][32][33][34][35], Italy [4,27,[36][37][38][39][40][41][42], the Netherlands [43] , France, Australia [12][13][14][15][16][17][18][19][20][21][22], the United States [44,45] and China [8][9][10][11][12][46][47][48][49][50][51]…”

Section: The Origin Of Mild Combustion Technologymentioning

confidence: 99%

See 1 more Smart Citation

Progress and recent trend in MILD combustion

Dally

et al. 2011

Sci. China Technol. Sci.

146

View full text Add to dashboard Cite

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.

show abstract

Section: The Origin Of Mild Combustion Technologymentioning

confidence: 99%

“…Firstly, a brief introduction is made to the history and current status of MILD combustion technology. Then the recent relevant R&D is reviewed [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Following this, the limitation of the current industrial systems of the technology is analyzed.…”

Section: Introductionmentioning

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

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…When increasing the methane content the temperature was slightly changing in the range of 960 to 980 ºC. However, such small temperature differences do not have a considerable influence on ammonia to NO x conversion ratios (Zieba et al, 2009b). Figure 3 shows the NO x concentration in the flue gas for three different CO/H 2 ratios as a function of methane concentration in the fuel.…”

Section: Nox Emission During Nh3 Doped Synthetic Gas Combustionmentioning

confidence: 99%

The Fate of Ammonia and Hydrogen Cyanide during Flameless Combustion of Low Calorific Value Gases

Zięba¹,

Fink²,

Schuster³

et al. 2012

Int. J. Thermo

Self Cite

View full text Add to dashboard Cite

In this paper, a review of the experimental investigations on the fuel-NO x formation during flameless combustion is presented. The first series of experiments described in the paper were conducted using ammonia doped synthetic gases with different compositions. During these experiments, the influence of gas composition on the conversion of ammonia (NH 3 ) to NO x is investigated. The second series of experiments were conducted using product gas generated in a fluidized bed gasifier. These results show the dependencies between the gasifier operating parameters, product gas composition and final NO x emissions. Moreover, the concentrations of the ammonia and hydrogen cyanide (HCN) in the product gas were measured in order to calculate the conversion ratios of these compounds to NO x . The results show the significant influence of the gas composition and the gasifier process parameters on the final NO x emissions. In particular, the hydrocarbon content influences the ammonia to NO x conversion. The lowest NO x emissions and therefore the lowest conversion ratios were measured while burning gases with a low hydrocarbon content. An increase of the hydrocarbon concentration in the gas corresponded to a rapid increase in the conversion ratios.

show abstract

Ammonia chemistry in a flameless jet

Cited by 35 publications

References 29 publications

Progress and recent trend in MILD combustion

Progress and recent trend in MILD combustion

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

The Fate of Ammonia and Hydrogen Cyanide during Flameless Combustion of Low Calorific Value Gases

Contact Info

Product

Resources

About