NOx emission characteristics of confined jet nonpremixed flames

2007 ◽  
Vol 31 (1) ◽  
pp. 1625-1632 ◽  
Author(s):  
Susumu Noda ◽  
Junya Inohae ◽  
Zaki S. Saldi
Keyword(s):  
Nox Emission ◽  
Emission Characteristics ◽  
Nonpremixed Flames ◽  
Jet Nonpremixed Flames

E214 Radiation effect on NOx emission characteristics of confined nonpremixed flames

2011 ◽  
Vol 2011 (0) ◽  
pp. 309-310
Author(s):  
Susumu Noda ◽  
Yuzuru Nada ◽  
Shoichiro Oguri ◽  
Takahiro Ito
Keyword(s):  
Radiation Effect ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Nonpremixed Flames

scholarly journals Effect of Flow Field on NOx Emission Properties of Jet Nonpremixed Flames in Cylindrical Furnaces

2007 ◽  
Vol 2 (4) ◽  
pp. 730-739
Author(s):  
Susumu NODA ◽  
I Gede PARWATHA ◽  
Yuzuru NADA ◽  
Shigenori NISHIO ◽  
Shingo FUKUSHIGE
Keyword(s):  
Flow Field ◽  
Nox Emission ◽  
Nonpremixed Flames ◽  
Emission Properties ◽  
Jet Nonpremixed Flames

Effects of Over Fire Air on the Combustion and NOx Emission Characteristics of a 600 MW Opposed Swirling Fired Boiler

2012 ◽  
Vol 512-515 ◽  
pp. 2135-2142 ◽  
Author(s):  
Yu Peng Wu ◽  
Zhi Yong Wen ◽  
Yue Liang Shen ◽  
Qing Yan Fang ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Empirical Method ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Cfd Model ◽  
Nitrogen Release ◽  
Computational Fluid Dynamics Cfd ◽  
Low Nox Emission

A computational fluid dynamics (CFD) model of a 600 MW opposed swirling coal-fired utility boiler has been established. The chemical percolation devolatilization (CPD) model, instead of an empirical method, has been adapted to predict the nitrogen release during the devolatilization. The current CFD model has been validated by comparing the simulated results with the experimental data obtained from the boiler for case study. The validated CFD model is then applied to study the effects of ratio of over fire air (OFA) on the combustion and nitrogen oxides (NOx) emission characteristics. It is found that, with increasing the ratio of OFA, the carbon content in fly ash increases linearly, and the NOx emission reduces largely. The OFA ratio of 30% is optimal for both high burnout of pulverized coal and low NOx emission. The present study provides helpful information for understanding and optimizing the combustion of the studied boiler

Effect of Cetane Number Improver on Emission Characteristics of Methanol/Diesel Blend Fuel

2012 ◽  
Vol 512-515 ◽  
pp. 1888-1891
Author(s):  
Jia Yi Du ◽  
Wei Xun Zhang ◽  
Deng Pan Zhang ◽  
Zhen Yu Sun
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Cetane Number ◽  
Nox Emission ◽  
Fuel Load ◽  
Emission Characteristics ◽  
Soot Emission ◽  
Maximum Torque ◽  
Blend Fuel ◽  
Co Emission

The influence of cetane number improver on emission characteristics of diesel engine fueled with methanol/diesel blend fuel was investigated. Methanol/diesel blend fuel was prepared, in which the methanol content is 10%, different mass fraction (0%，0.5%) of cetane number improver were added to the blend fuel. Load characteristic experiments at maximum torque speed of the engine were carried out on 4B26 direct injection diesel engine. The results show that, compared with the engine fueled with diesel, the CO emission increases under low loads and reduces under medium and high loads, the HC emission increases, the NOx emission decreases under medium and low loads and increases under high loads, the soot emission reduces significantly when the diesel engine fueled with blends. When cetane number improver was added to blends, the CO and NOx emission reduces, the HC emission decreases, the soot emission increases to some extent compared with the methanol/dieselblend fuel without cetane number improver.

Effects of Flow Field on Combustion Characteristics of Confined Jet Nonpremixed Flames

2007 ◽  
Author(s):  
Susumu Noda ◽  
Yuzuru Nada ◽  
I. Gede Parwatha ◽  
Shingo Fukushige
Keyword(s):  
Flow Characteristics ◽  
Flow Fields ◽  
Nonpremixed Flames ◽  
Air Velocity ◽  
Velocity Difference ◽  
Flame Stretch ◽  
Inner Diameter ◽  
Jet Nonpremixed Flames ◽  
Cylindrical Furnace ◽  
Emission Index

Confined flames are widely used in the industrial field. The flame characteristics can be strongly dominated by the combination of a burner and furnace geometries, which were not paid much attention before. In the present study, flow fields in confined flames are discussed in terms of the flame characteristics. The flow characteristics of confined flames have been investigated for propane nonpremixed flames in cylindrical furnaces. The effects of the inner diameter of the cylindrical furnace D1, the turbulence at the flame boundary, and the global equivalence ratio φ are examined in terms of the relation between the emission of NOx and the flow fields. The emission index of NOx, EINOx, decreases roughly with these parameters. The decrease in EINOx is thought to be related to the dilution of mixtures by the burned gas and the flame stretch. The dilution is attributable to vortices formed at the bottom of the furnace, and the flame stretch is attributable to the air velocity difference ΔUa created by two air nozzles. In the present study, it was found that the increases in D1, ΔUa, and φ enlarge and strengthen recirculation vortices to dilute the flame.

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