The characteristics and mechanism of the NO formation during oxy-steam combustion

Zou, Chun; He, Yizhuo; Song, Yu; Han, Qingsong; Liu, Yang; Guo, Fei; Chen, Zheng

doi:10.1016/j.fuel.2015.06.034

Cited by 37 publications

(10 citation statements)

References 47 publications

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“…To elucidate the characteristics of the HLE char samples obtained from the devolatilization of each dried HLE coal sample (reaction temperature: 800 °C; residence time: 30 min; and atmosphere: Ar), Raman spectra were applied to determine the effect of the degree of drying on the degree of graphitization of the devolatilizated HLE chars. Raman spectra in the 1800–900 cm −1 region could be divided into two parts: the G band (graphitic structure) located at around 1590 cm −1 ; and the D band (disordered or defects structures) located at around 1360 cm −1 . In turn, the D band can also be deconvoluted into three typical peaks: D1; D3; and D4 bands .…”

Section: Resultsmentioning

confidence: 99%

Effects of lignite dewatering treatment on the surface behaviour and NO emission characteristics during the combustion process

Zhao

Sun

et al. 2019

Can J Chem Eng

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Hailaer lignite (HLE) with a uniform particle size distribution (3-6 mm) was employed to investigate the parameters of the low-temperature dewatering process influencing the emission of gaseous pollutants (NO x ) during their combustion process. The combustion of HLE original/dried samples obtained from a COMBD ry drying system were carried out in a fixed bed horizontal furnace under an air atmosphere at the reaction temperature of 1100 8C. The dewatering treatment led to the enhancement of the relative amount of the volatile and fixed carbon content in the upgraded coal sample. The deconvolution of the Raman spectra of each sample showed that the increased degree of drying led to an enhancement of the defects in aromatic structures, indicating an enhancement in the number of active sites or oxygen-containing complexes on particle surface. The devolatilization and combustion experimental results showed the following: (1) with the increase in the degree of drying, more HCN and NH 3 were released during the devolatilization process, and both HCN and NH 3 molecules had positive effects on the consumption of NO under high temperature conditions; (2) due to the enhancement of the specific surface area and total amount of surface active sites (C f ) after the drying treatment, the combustion and reduction reactivity of the dried HLE samples increased significantly; and (3) the conversion ratio of fuel-N to NO during the combustion process decreased significantly with the increase of the degree of dewatering. Therefore, it could be concluded that the removal of moisture content in lignite particles in advance had positive effects on lignite high efficiency combustion with low NO emission.

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Section: Resultsmentioning

confidence: 99%

Effects of lignite dewatering treatment on the surface behaviour and NO emission characteristics during the combustion process

Zhao

Sun

et al. 2019

Can J Chem Eng

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“…On the contrary, CO 2 and H 2 O can drastically alter the ignition process in dependence of operating conditions with a twofold interaction. They increase system reactivity at low temperatures (Sabia et al, 2007(Sabia et al, , 2015Sjöberg et al, 2007;Anderlohr et al, 2010;Lubrano Lavadera et al, 2016), but delay it at intermediatehigh temperatures (Mueller et al, 1999;Cadman et al, 2000;de Joannon et al, 2002;Park et al, 2003;Wang et al, 2003Wang et al, , 2013Herzler et al, 2004;Penyazkov et al, 2005;Zabetta et al, 2005;Basevich and Frolov, 2007;Glarborg and Bentzen, 2007;Sjöberg et al, 2007;Gallagher et al, 2008;Le Cong and Dagaut, 2009a,b;Mendiara and Glarborg, 2009;Mardani et al, 2010Mardani et al, , 2013Lee et al, 2012;Sabia et al, 2013Sabia et al, , 2015Chen and Ghoniem, 2014;Xie et al, 2014a;Song et al, 2015;Zou et al, 2015;Hashemi et al, 2016Hashemi et al, , 2017Hashemi et al, , 2019Lubrano Lavadera et al, 2016, 2018aEvans et al, 2017;He et al, 2017;Fedyaeva et al, 2018;Sorrentino et al, 2018;Zhang et al, 2019). ...…”

Section: Discussionmentioning

confidence: 99%

Critical Issues of Chemical Kinetics in MILD Combustion

Sabia

Joannon

2020

Front. Mech. Eng.

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Mild combustion processes occur with mixtures highly diluted and preheated by a strong recirculation of hot exhausted gases (thus mass and sensible enthalpy) within the combustion chamber. This strategy configures a process based on autoignition kernels outside or close to flammability limits transported by convection in the combustion chamber, thus defining a process with unique physical and chemical features drastically different from traditional deflagrative-diffusive flames. The article aims at analyzing the recent issues relative to kinetic aspects involved in moderate or intense low-oxygen dilution (MILD) combustion processes. First, the article comes through the identification of peculiar experimental features of simple hydrocarbons oxidation process induced by highly preheated and diluted conditions in model reactors typical of chemical engineering. Second, the effects of steam and carbon dioxides on fuel oxidation process, whose presence within the combustion chamber is imposed by high levels of hot gas recirculation, are addressed. Third, the article comes through a thorough analysis of recent scientific contributions on kinetic aspects of MILD combustion processes to identify the critical points in modeling activities.

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“…In oxy‐H 2 O combustion, fuels are burnt in a mixture of O 2 and H 2 O vapor, and the exhaust gas mainly consists of H 2 O vapor and CO 2 . Figure shows the schematic of oxy‐H 2 O combustion process . As a new generation of CCS technology, oxy‐H 2 O combustion offers the following advantages over oxy‐CO 2 combustion: (a) the system is simplified due to the absence of recycled flue gas system; (b) the sizes of the equipment system are smaller; (c) the power consumption is reduced due to the low pumping costs; and (d) the NOx and SOx emissions are reduced .…”

Section: Introductionmentioning

confidence: 99%

“…Figure shows the schematic of oxy‐H 2 O combustion process . As a new generation of CCS technology, oxy‐H 2 O combustion offers the following advantages over oxy‐CO 2 combustion: (a) the system is simplified due to the absence of recycled flue gas system; (b) the sizes of the equipment system are smaller; (c) the power consumption is reduced due to the low pumping costs; and (d) the NOx and SOx emissions are reduced . Because of the global warming and the shortage of fossil fuels, biomass, a renewable and CO 2 ‐neutral energy source, has already attracted much attention …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study of the combustion and NO emission behaviors during cofiring coal and biomass in O₂/N₂ and O₂/H₂O

Zhou

et al. 2018

Asia-Pacific J Chem Eng

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The characteristics and mechanism of the NO formation during oxy-steam combustion

Cited by 37 publications

References 47 publications

Effects of lignite dewatering treatment on the surface behaviour and NO emission characteristics during the combustion process

Effects of lignite dewatering treatment on the surface behaviour and NO emission characteristics during the combustion process

Critical Issues of Chemical Kinetics in MILD Combustion

Experimental study of the combustion and NO emission behaviors during cofiring coal and biomass in O₂/N₂ and O₂/H₂O

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The characteristics and mechanism of the NO formation during oxy-steam combustion

Cited by 37 publications

References 47 publications

Effects of lignite dewatering treatment on the surface behaviour and NO emission characteristics during the combustion process

Effects of lignite dewatering treatment on the surface behaviour and NO emission characteristics during the combustion process

Critical Issues of Chemical Kinetics in MILD Combustion

Experimental study of the combustion and NO emission behaviors during cofiring coal and biomass in O2/N2 and O2/H2O

Contact Info

Product

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Experimental study of the combustion and NO emission behaviors during cofiring coal and biomass in O₂/N₂ and O₂/H₂O