Influence of nozzle height to width ratio on ignition and NOx emission characteristics of semicoke/bituminous coal blends in a 300 kW pulverized coal-fired furnace

2021 ◽  
Author(s):  
Liutao Sun ◽  
Yonghong Yan ◽  
Rui Sun ◽  
Zhengkang Peng ◽  
Chunli Xing ◽  
...  
Keyword(s):  
Bituminous Coal ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Width Ratio ◽  
Emission Characteristics ◽  
Nozzle Height

Numerical Study the NOx Emission Characteristics of 600MW Opposed Swirling Coal-Fired Utility Boiler

2014 ◽  
Vol 1010-1012 ◽  
pp. 847-855
Author(s):  
Ya Ming Liu ◽  
Fang Yong Li ◽  
Qi Sheng Xu
Keyword(s):  
Fly Ash ◽  
Carbon Content ◽  
Residence Time ◽  
Flue Gas ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Cfd Model ◽  
Gas Temperature ◽  
Coal Particles

In this paper, a computational fluid dynamics (CFD) model of a 600 MW opposed swirling coal-fired utility boiler has been established to numerically study the NOx emission characteristics under different ratios of over fire air (OFA) and modes of in-service burner layers. The current CFD model had adopted a chemical percolation devolatilization (CPD) model and been validated by comparing the simulated results with the experimental data. The numerical simulation results show that, with increasing the ratio of OFA, the carbon content in fly-ash increase somewhat linearly and the NOx emission reduce significantly, and the OFA ratio of 30% is optimal with higher burnout of pulverized coal and lower NOx emission. The different in-service burner layer modes have different influences on the residence time of the pulverized-coal particles, effect of air staging in the burner region and flue gas temperature at the exit of the lower furnace. Stopping the upper burner layers can increases the residence time of the pulverized-coal particles, resulting in the reduction of the carbon content in the fly ash and the increase of the pulverized-coal burnout. The flue gas temperature at the exit of the lower furnace can also decrease, which would be helpful to reducing the slagging tendency on the surfaces of the platen superheaters.

scholarly journals Numerical simulation of NOx emission characteristics during combustion in 350 MW supercritical cogeneration tangentially boiler

2020 ◽  
Vol 24 (5 Part A) ◽  
pp. 2717-2728
Author(s):  
Wei-Shu Wang ◽  
Zhi-Hao Huang ◽  
Miao Tian ◽  
Ji-Hong Wang ◽  
Shan-Shan Shangguan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
Nitrogen Oxides ◽  
Influencing Factors ◽  
Combustion Characteristics ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Release Mechanism ◽  
Emission Characteristics ◽  
Boiler Load

In light of a 350 megawatt supercritical cogeneration tangential boiler, the combustion and the nitrogen oxides release mechanism in the furnace were numerically simulated. The combustion characteristics were analyzed, and the influencing factors, such as the pulverized coal concentration, the velocity of separated over-fire air and the boiler load, on nitrogen oxides release in the furnace were also systematically studied. The results show that the central airflow in the furnace rises spirally, and an inverted ?V? type temperature distribution is formed. The generation of nitrogen oxides can be effectively restrained by increasing the concentration of pulverized coal properly. Compared with the conventional concentration, the concentration of nitrogen oxides at the furnace exit can be reduced by 29.63% by taking high pulverized coal concentration. The concentration of NOx at the furnace exit can be drastically reduced by increasing the velocity of separated over-fire air. When decreasing boiler load, the concentration of NOx at furnace exit declines at first and then increases.

Experimental study on the combustion and NOx emission characteristics of a bituminous coal blended with semi-coke

2019 ◽  
Vol 160 ◽  
pp. 113993 ◽  
Author(s):  
Lilin Hu ◽  
Yang Zhang ◽  
Denggao Chen ◽  
Jugang Fang ◽  
Man Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Bituminous Coal ◽  
Nox Emission ◽  
Emission Characteristics

The combustion and NOx emission characteristics of the ultra-low volatile fuel using the novel pulverized coal self-sustained preheating combustion technology

Fuel ◽  
2020 ◽  
Vol 271 ◽  
pp. 117592 ◽  
Author(s):  
Wenhao Song ◽  
Ziqu Ouyang ◽  
Minghao Wang ◽  
Shiyuan Li ◽  
Jingzhang Liu ◽  
...  
Keyword(s):  
Pulverized Coal ◽  
Nox Emission ◽  
Emission Characteristics ◽  
The Novel ◽  
Combustion Technology

Effects of burner tilt angle on the combustion and NOX emission characteristics of a 700 MWe deep-air-staged tangentially pulverized-coal-fired boiler

Fuel ◽  
2017 ◽  
Vol 196 ◽  
pp. 314-324 ◽  
Author(s):  
Peng Tan ◽  
Dengfeng Tian ◽  
Qingyan Fang ◽  
Lun Ma ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Tilt Angle ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Emission Characteristics

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

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

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