Investigation on NOx Formation Characteristics During Semi-coke Air-Staged Combustion

2021 ◽  
pp. 423-434
Author(s):  
Hui Li ◽  
Naiji Wang ◽  
Shi Yang ◽  
Xin Zhang ◽  
Yuhong Cui ◽  
...  
Keyword(s):  
Staged Combustion ◽  
Nox Formation

Pulverized coal combustion: NOx formation mechanisms under fuel rich and staged combustion conditions

1979 ◽  
Vol 17 (1) ◽  
pp. 77-87 ◽  
Author(s):  
J.O.L. Wendt ◽  
D.W. Pershing ◽  
J.W. Lee ◽  
J.W. Glass
Keyword(s):  
Coal Combustion ◽  
Pulverized Coal ◽  
Formation Mechanisms ◽  
Pulverized Coal Combustion ◽  
Staged Combustion ◽  
Nox Formation

Large-Eddy Simulation of a Reacting Jet in Cross Flow With NOx Prediction

2016 ◽  
Vol 139 (3) ◽  
Author(s):  
Johannes Weinzierl ◽  
Michael Kolb ◽  
Denise Ahrens ◽  
Christoph Hirsch ◽  
Thomas Sattelmayer
Keyword(s):  
Large Eddy Simulation ◽  
Cross Flow ◽  
Nox Emissions ◽  
Staged Combustion ◽  
Nox Formation ◽  
Full Load ◽  
Eddy Simulation ◽  
Jet In Cross Flow ◽  
Large Eddy ◽  
Combustion Systems

The reduction of full and part load emissions and the increase of the turndown ratio are important goals for gas turbine combustor development. Combustion techniques, which generate lower NOx emissions than unstaged premixed combustion in the full load range, and which have the potential of reducing minimum load while complying with emission legislation, are of high technical interest. Therefore, axial-staged combustion systems have been designed, either with or without expansion in a turbine stage between both stages. In its simpler form without intermediate expansion stage, a flow of hot combustion products is generated in the first stage of the premixed combustor, which interacts with the jets of premixed gas injected into the second stage. The level of NOx formation during combustion of the premixed jets in the hot cross flow determines the advantage of axially staged combustion regarding full load NOx emission reduction. Employing large-eddy simulation in openfoam, a tool has been developed, which allows to investigate staged combustion systems including not only temperature distribution but also NOx emissions under engine conditions. To be able to compute NOx formation correctly, the combustion process has to be captured with sufficient level of accuracy. This is achieved by the partially stirred reactor model. It is combined with a newly developed NOx model, which is a combination of a tabulation technique for the NOx source term based on mixture fraction and progress variable and a partial equilibrium approach. The NOx model is successfully validated with generic burner stabilized flame data and with measurements from a large-scale reacting jet in cross flow experiment. The new NOx model is finally used to compute a reacting jet in cross flow under engine conditions to investigate the NOx formation of staged combustion in detail. The comparison between the atmospheric and the pressurized configuration gives valuable insight in the NOx formation process. It can be shown that the NOx formation within a reacting jet in cross flow configuration is reduced and not only diluted.

Large Eddy Simulation of a Reacting Jet in Cross Flow With NOx Prediction

2016 ◽  
Author(s):  
Johannes Weinzierl ◽  
Michael Kolb ◽  
Denise Ahrens ◽  
Christoph Hirsch ◽  
Thomas Sattelmayer
Keyword(s):  
Large Eddy Simulation ◽  
Cross Flow ◽  
Nox Emissions ◽  
Staged Combustion ◽  
Nox Formation ◽  
Full Load ◽  
Eddy Simulation ◽  
Jet In Cross Flow ◽  
Large Eddy ◽  
Combustion Systems

The reduction of full and part load emissions and the increase of the turndown ratio are important goals for gas turbine combustor development. Combustion techniques, which generate lower NOx emissions than unstaged premixed combustion in the full load range, and which have the potential of reducing minimum load while complying with emission legislation, are of high technical interest. Therefore axial staged combustion systems have been designed, either with or without expansion in a turbine stage between both stages. In its simpler form without intermediate expansion stage a flow of hot combustion products is generated in the first stage of the premixed combustor, which interacts with the jets of premixed gas injected into the second stage. The level of NOx formation during combustion of the premixed jets in the hot cross flow determines the advantage of axially staged combustion regarding full load NOx emission reduction. Employing Large Eddy Simulation in OpenFOAM, a tool has been developed, which allows to investigate staged combustion systems including not only temperature distribution but also NOx emissions under engine conditions. To be able to compute NOx formation correctly the combustion process has to be captured with sufficient level of accuracy. This is achieved by the partially stirred reactor model. It is combined with a newly developed NOx model, which is a combination of a tabulation technique for the NOx source term based on mixture fraction and progress variable and a partial equilibrium approach. The NOx model is successfully validated with generic burner stabilized flame data and with measurements from a large scale reacting jet in cross flow experiment. The new NOx model is finally used to compute a reacting jet in cross flow under engine conditions to investigate the NOx formation of staged combustion in detail. The comparison between the atmospheric and the pressurized configuration gives valuable insight in the NOx formation process. It can be shown that the NOx formation within a reacting jet in cross flow configuration is reduced and not only diluted.

scholarly journals NOx formation of swirl burner under air-staged combustion with flue gas recycle

2020 ◽  
Vol 194 ◽  
pp. 01042
Author(s):  
Jinyan Yuan ◽  
Mingming Wang ◽  
Jihua Li ◽  
Yuyu Lin ◽  
Xiangyong Huang ◽  
...  
Keyword(s):  
Flue Gas ◽  
Coal Combustion ◽  
Nox Emission ◽  
Temperature Decrease ◽  
Gas Temperature ◽  
Gas Velocity ◽  
Staged Combustion ◽  
Swirl Burner ◽  
Nox Formation ◽  
Furnace Outlet

Air-staged and flue gas recycle (FGC) combustion are important technologies to reduce NOx emissions. This study explores FGC ratios on the NOx formation in the primary combustion zone under air-staged combustion for a HT-NR3 swirl burner at different air excess coefficients. The coal combustion characteristics including gas velocity, temperature, gas components and NOx emission under different FGC ratios were analyzed. The results show that higher the FGC ratio will larger the gas temperature decrease and lower the NOx emission. Combined FGC technology with lower air excess coefficients technology, the NOx emission at outlet of furnace will be further reduced. When the air consumption excess coefficient is 0.8 with FGC ratio 20%, the NOx concentration at the furnace outlet will decrease from 208ppm to 138ppm, lower 33.6%.

Effect of the Coal Blending Ratio on NOx Formation under Multiple Deep Air-Staged Combustion

2019 ◽  
Vol 34 (1) ◽  
pp. 853-862 ◽  
Author(s):  
Yongqiang Wang ◽  
Yuegui Zhou
Keyword(s):  
Staged Combustion ◽  
Nox Formation ◽  
Coal Blending

Pogo Stability Approaches for the Strap-On Launch Vehicle with Staged Combustion Cycle Engines

2020 ◽  
Vol 57 (4) ◽  
pp. 636-641 ◽  
Author(s):  
Tao Liu ◽  
Jin-Fan Liu ◽  
Wen-Bin Di ◽  
Guo-An Tang ◽  
Lin-Yu Song
Keyword(s):  
Launch Vehicle ◽  
Staged Combustion ◽  
Combustion Cycle

scholarly journals Effect of the oxygen carrier ilmenite on NOX formation in chemical-looping combustion

2021 ◽  
Vol 222 ◽  
pp. 106962
Author(s):  
Stefan Mayrhuber ◽  
Fredrik Normann ◽  
Duygu Yilmaz ◽  
Henrik Leion
Keyword(s):  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Nox Formation

Numerical Investigation of the Pressure Effect on the NOx Formation in a Lean-Premixed Gas Turbine Combustor

2021 ◽  
Vol 35 (8) ◽  
pp. 6776-6784
Author(s):  
Truc Huu Nguyen ◽  
Jungkyu Park ◽  
Changhun Sin ◽  
Seungchai Jung ◽  
Shaun Kim
Keyword(s):  
Numerical Investigation ◽  
Gas Turbine ◽  
Pressure Effect ◽  
Gas Turbine Combustor ◽  
Nox Formation ◽  
Lean Premixed

NOx Reduction Strategy by Staged Combustion with Plasma-Assisted Flame Stabilization

2012 ◽  
Vol 26 (7) ◽  
pp. 4284-4290 ◽  
Author(s):  
Dae Hoon Lee ◽  
Kwan-Tae Kim ◽  
Hee Seok Kang ◽  
Young-Hoon Song ◽  
Jae Eon Park
Keyword(s):  
Nox Reduction ◽  
Flame Stabilization ◽  
Staged Combustion ◽  
Reduction Strategy
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