Combustion stability limits and NOx emissions of nonpremixed ammonia-substituted hydrogen–air flames

Um, D.H.; Joo, Jin Deok; Lee, Seungro; Kwon, Oh Chae

doi:10.1016/j.ijhydene.2013.08.140

Cited by 51 publications

(19 citation statements)

References 17 publications

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“…Residual flames, lifted flames, and seated propagating flames were observed. 11 High reactivity and diffusivity of H2 are responsible for the potential of explosion hazards in storage. The potential of NH3 as a carbon-free additive for improving the safety of H2 applied in both non premixed and premixed H2-air flames has been evaluated.…”

Section: 10 Introductionmentioning

confidence: 99%

Emission and Combustion Characteristics of Hydrogen in Vortex Flame

2014

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Due to industrial development and population growth, global demand for energy has increased enormously. The increased consumption of primary sources of energy such as coal, oil and natural gas has exerted a strong influence on the atmospheric environment. Among all of the alternative fuels, hydrogen offers the greatest potential benefits to energy supply and the environment. In the current study computational investigations of a turbulent asymmetric vortex flame is presented. This study has predicted lean and stoichiometry flammability limits for hydrogen. The three dimensional flow fields have been described using a computational methodology that implements the k−ε RNG turbulence model. The computational model is validated for reaction flow. The special hydrogen-air mixing concept eliminates the risk of flame flashback and enables operation with very low NOx emissions.

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Section: 10 Introductionmentioning

confidence: 99%

Emission and Combustion Characteristics of Hydrogen in Vortex Flame

2014

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“…The use of NH 3 as a fuel by adding it to methane (Williams et al, 1991;Bell et al, 2002;Sullivan et al, 2002;Henshaw et al, 2005;Barbas et al, 2015), diesel (Reiter and Kong, 2011;Gill et al, 2012), DME (Gross and Kong, 2013), and H 2 (Skreiberg et al, 2004;Mendiara and Glarborg, 2009;Mørch et al, 2011;Joo and Kwon, 2012;Um et al, 2013;Choi et al, 2015) has been investigated. NH 3 has often been used as an agent for decreasing NO x emissions in industrial treatment processes through selective catalytic reactions (Xu et al, 2002;Grossale et al, 2009;Yun and Kim, 2013).…”

Section: Properties Of Nhmentioning

confidence: 99%

A Review on Combustion Characteristics of Ammonia as a Carbon-Free Fuel

Lai

Chen

et al. 2021

Front. Energy Res.

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A comprehensive review of combustion characteristics of ammonia (NH3) as a carbon free fuel is presented. NH3 is an attractive alternative fuel candidate to reduce the consumption of fossil fuel and the emission of CO2, soot, and hydrocarbon pollutants, due to its comparable combustion properties, productivities from renewable sources, and storage and transportation by current commercial infrastructure. However, the combustion properties of NH3 are quite different from conventional hydrocarbon fuels, which highlight the specific difficulties during the application of NH3. Therefore, this paper presents comparative experimental and numerical studies of the application of NH3 as a fuel during combustion process, including the combustion properties of laminar burning velocity, flame structures, pollutant emissions for the application of NH3 as a carbon free fuel. This paper presents the burning velocity and pollutant emissions of NH3 alone and mixtures with other fuels to improve the combustion properties. The aim of this paper is to review and describe the suitability of NH3 as a fuel, including the combustion and emission characteristics of NH3 during its combustion process.

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“…Figure 11 shows the shadowgraph images of ammonia-substituted hydrogen-air flames with various equivalence ratios. The laboratory additionally conducted a study on the combustion stability and NOx emission characteristics during hydrogen-ammonia co-firing [66,67]. Lee et al investigated the fundamental combustion characteristics of hydrogen-ammonia-air flames [65].…”

Section: Effect Of Ammonia-hydrogen and -Methane Mixture On The Combustion Characteristicsmentioning

confidence: 99%

Recent Advances in Ammonia Combustion Technology in Thermal Power Generation System for Carbon Emission Reduction

Lee

2021

Energies

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With the formation of an international carbon-neutral framework, interest in reducing greenhouse gas emissions is increasing. Ammonia is a carbon-free fuel that can be directly combusted with the role of an effective hydrogen energy carrier, and its application range is expanding. In particular, as research results applied to power generation systems such as gas turbines and coal-fired power plants have been reported, the technology to use them is gradually being advanced. In the present study, starting with a fundamental combustion research case conducted to use ammonia as a fuel, the application research case for gas turbines and coal-fired power plants was analyzed. Finally, we report the results of the ammonia-air burning flame and pulverized coal-ammonia-air co-fired research conducted at the authors’ research institute.

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Combustion stability limits and NOx emissions of nonpremixed ammonia-substituted hydrogen–air flames

Cited by 51 publications

References 17 publications

Emission and Combustion Characteristics of Hydrogen in Vortex Flame

Emission and Combustion Characteristics of Hydrogen in Vortex Flame

A Review on Combustion Characteristics of Ammonia as a Carbon-Free Fuel

Recent Advances in Ammonia Combustion Technology in Thermal Power Generation System for Carbon Emission Reduction

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