scholarly journals Numerical Study of NOx Emission in High Temperature Air Combustion.

1998 ◽  
Vol 41 (2) ◽  
pp. 331-337 ◽  
Author(s):  
Hongsheng GUO ◽  
Yiguang JU ◽  
Kaoru MARUTA ◽  
Takashi NIIOKA ◽  
Jun'ichi SATO
Keyword(s):  
High Temperature ◽  
Numerical Study ◽  
Nox Emission ◽  
High Temperature Air Combustion

Numerical Study on High Temperature Air Combustion in U-Type Tube

2008 ◽  
Author(s):  
Xing Li ◽  
Li Jia ◽  
Tiantian Zhang ◽  
Lixin Yang
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
Combustion Chamber ◽  
Numerical Study ◽  
Maximum Temperature ◽  
No Emission ◽  
High Temperature Air Combustion ◽  
Average Temperature ◽  
Combustion Technology ◽  
Type Tube

In this paper, the combustion characteristics of natural gas with high-temperature air combustion technology in a U-type combustion chamber were investigated by the numerical method. The results of the CFD-based mathematical modeling of rated condition were compared with experimental data including the maximum temperature, average temperature and NO emission. The research indicates that the combustion can be well simulated using the suggested numerical model. The temperature distribution, velocity distribution in the combustion chamber and NO emission were attained. In addition, the effects of some parameters such as oxygen concentration, excessive air ratio and combustion air temperature were discussed in detail. It provided primarily theoretic basis for further study of natural gas high temperature air combustion.

scholarly journals Effects of Turbulence on Flame Structure and NOx Emission of Turbulent Jet Non-Premixed Flames in High-Temperature Air Combustion

2005 ◽  
Vol 48 (2) ◽  
pp. 286-292 ◽  
Author(s):  
Hideaki KOBAYASHI ◽  
Ken OONO ◽  
Eun-Seong CHO ◽  
Hirokazu HAGIWARA ◽  
Yasuhiro OGAMI ◽  
...  
Keyword(s):  
High Temperature ◽  
Flame Structure ◽  
Premixed Flames ◽  
Turbulent Jet ◽  
Nox Emission ◽  
High Temperature Air Combustion

The Effect of Distance Between Fuel and Oxidizer Nozzles on NOx Emission From High Temperature Air Combustion

2011 ◽  
Author(s):  
Yuzuru Nada ◽  
Yasutomo Zenman ◽  
Takahiro Ito ◽  
Susumu Noda
Keyword(s):  
High Temperature ◽  
Flame Temperature ◽  
Dilution Effect ◽  
Nox Emission ◽  
Emission Characteristics ◽  
High Temperature Air Combustion ◽  
Flamelet Model ◽  
Scaling Parameters ◽  
Fuel Nozzle ◽  
Emission Index

This study describes NOx emission characteristics of a high temperature air combustion furnace operating with parallel jet burner system. In the parallel jet burner system, fuel nozzles are separated with a distance from an oxidizer nozzle. Objectives of this study are to clarify the effect of the distance between the fuel nozzle and the oxidizer nozzle on NOx emission. The emission index of NOx (EINOx) decreases with the increase in the distance. This is due to the dilution through entrainment of burned gas. A scaling concept is proposed to assess the dilution effect on the NOx emission. Scaling parameters employed here are the global residence time of fuel and the flame temperature evaluated on a modified flamelet model in which the dilution effect is included. The overall EINOx production rate is scaled with the flame temperature. This scaling indicates the importance of the distance between the nozzles for NOx emission.

scholarly journals Performance of High Temperature Air Combustion Boiler with Low NOx Emission.

2002 ◽  
Vol 45 (3) ◽  
pp. 481-486 ◽  
Author(s):  
Hiromichi KOBAYASHI ◽  
Yoshihito ITO ◽  
Naoki TSURUTA ◽  
Kunio YOSHIKAWA
Keyword(s):  
High Temperature ◽  
Nox Emission ◽  
High Temperature Air Combustion ◽  
Low Nox Emission

Numerical Study on NO Mechanism during High Temperature Air Combustion of Natural Gas

2012 ◽  
Vol 190-191 ◽  
pp. 609-614
Author(s):  
Ya Xin Su ◽  
Cui Wu Chen
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
No Reduction ◽  
Numerical Study ◽  
Combustion Process ◽  
Combustion Model ◽  
Small Contribution ◽  
High Temperature Air Combustion ◽  
Intermediate Model ◽  
No Formation

A full nitric oxide mechanism including thermal NO, prompt NO, N2O intermediate model and NO reduction model through reburning was used to calculate the NO formation during high temperature air combustion of natural gas in industrial furnace. The turbulent transportation was simulated by Reynolds stress model (RSM) and a modified Eddy-Break-Up (EBU) combustion model was applied to model the combustion process. A three-step reaction scheme of the natural gas combustion reaction was considered. Experimental data from published literature was adopted to validate the present models. Numerical results showed that thermal NO formation mechanism and reburning NO reduction mechanism were the dominant NO models. Reburning NO reduction could not be ignored. Prompt NO gave a small contribution to NO emission and the N2O intermediate model for NO formation was of little importance.

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