NO emission from high temperature air combustion of natural gas with longitudinal and swirling burner

2011 ◽  
Author(s):  
Yaxin Su ◽  
Wenyi Deng ◽  
Fan Jiang
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
No 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.

Influence of Preheated Air Temperature on High Temperature Air Combustion in Furnace with Swirling Burner: a Modeling Study

2011 ◽  
Vol 354-355 ◽  
pp. 315-318
Author(s):  
Ya Xin Su ◽  
Wen Hui Wang
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
Air Temperature ◽  
Beta Function ◽  
Reynolds Stress Model ◽  
Combustion Model ◽  
Discrete Ordinates ◽  
No Emission ◽  
High Temperature Air Combustion ◽  
Gas Combustion

The high temperature air combustion performance of natural gas in an industrial furnace with a swirling burner was numerically modeled. A Beta function PDF (Probability Density Function) combustion model was selected to simulate the gas combustion combined with the Reynolds Stress Model (RSM) to simulate the turbulent flow. The radiation was simulated by a Discrete Ordinates method. The NO chemistry was simulated by thermal NO model. The simulation was performed at inlet air oxygen fraction 8% and the total air excess ratio 1.1 for natural gas. The effect of preheated air temperature on NO emission, temperature, O2 and CO distribution in the furnace was investigated. Results showed that thermal NO emission increased when the preheated air temperature increased from 1073 K to 1473K. When the preheated air temperature increased, both of the maximum and averaged temperature in the furnace increased. The oxygen was consumed by the formation of thermal NO at higher inlet air temperature and the fuel was not fully burnt out.

Analysis of low NO emission in high temperature air combustion for pulverized coal

Fuel ◽  
2004 ◽  
Vol 83 (9) ◽  
pp. 1133-1141 ◽  
Author(s):  
Rong He ◽  
Toshiyuki Suda ◽  
Makoto Takafuji ◽  
Tetsuya Hirata ◽  
Jun'ichi Sato
Keyword(s):  
High Temperature ◽  
Pulverized Coal ◽  
No Emission ◽  
High Temperature Air Combustion

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.

High temperature air combustion boiler for low BTU gas

2002 ◽  
Vol 43 (9-12) ◽  
pp. 1563-1570 ◽  
Author(s):  
Kazuhiro Kawai ◽  
Kunio Yoshikawa ◽  
Hiromichi Kobayashi ◽  
Jeng-Syan Tsai ◽  
Mamoru Matsuo ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Air Combustion
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