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

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

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.

The ultra-low NOx emission characteristics of pulverized coal combustion after high temperature preheating

Fuel ◽  
2020 ◽  
Vol 277 ◽  
pp. 118050 ◽  
Author(s):  
Yi Zhang ◽  
Jianguo Zhu ◽  
Qinggang Lyu ◽  
Jingzhang Liu ◽  
Fei Pan ◽  
...  
Keyword(s):  
High Temperature ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Pulverized Coal Combustion ◽  
Low Nox Emission

The Integrated Analysis of Economy and Safety on SOFA Running Mode of a 600MWe Boiler

2012 ◽  
Vol 516-517 ◽  
pp. 115-119
Author(s):  
Jian Guo Yang ◽  
Yang Yang ◽  
Qing Fu Zhang ◽  
Hong Zhao
Keyword(s):  
High Temperature ◽  
Thermal Efficiency ◽  
High Temperature Corrosion ◽  
Nox Emission ◽  
Integrated Analysis ◽  
Water Wall ◽  
Reduction Of Nox ◽  
Main Components ◽  
Low Nox Emission ◽  
Running Mode

The application of separated over-fire air (SOFA) in coal-fired boiler results in significant decrease of NOx emission but increases the trend of fireside water wall high temperature corrosion and incomplete combustion of pulverized coal. In order to meet the balance between low NOx emission and high boiler thermal efficiency, the main factors of air staging including SOFA flow, SOFA jet velocity and SOFA jet height were experimented on a 600MWe boiler. At the same time, the main components of flue gas beside the water wall were measured to evaluate the trend of high temperature corrosion. By comprehensive analysis, the optimum running mode of SOFA is concluded: (a) 75% of normal SOFA flow is suggested to reduce the trend of high temperature corrosion; (b) higher SOFA velocity is better for higher boiler thermal efficiency; (c) higher SOFA jet height is beneficial to the reduction of NOx emission.

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

NOx emission from high-temperature air/methane counterflow diffusion flame

2002 ◽  
Vol 41 (7) ◽  
pp. 693-698 ◽  
Author(s):  
Ryugo Fuse ◽  
Hideaki Kobayashi ◽  
Yiguang Ju ◽  
Kaoru Maruta ◽  
Takashi Niioka
Keyword(s):  
High Temperature ◽  
Diffusion Flame ◽  
Nox Emission ◽  
Counterflow Diffusion Flame
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