Combustion and NOx Emission Characteristics with Respect to Staged-Air Damper Opening in a 600 MWe Down-Fired Pulverized-Coal Furnace under Deep-Air-Staging Conditions

2013 ◽  
Vol 48 (1) ◽  
pp. 837-844 ◽  
Author(s):  
Min Kuang ◽  
Zhengqi Li ◽  
Zhihua Wang ◽  
Xinjing Jing ◽  
Chunlong Liu ◽  
...  
Keyword(s):  
Pulverized Coal ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Air Staging

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.

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 Air Staging Conditions on the Combustion and NOx Emission Characteristics in a 600 MW Wall Fired Utility Boiler Using Lean Coal

2013 ◽  
Vol 27 (10) ◽  
pp. 5831-5840 ◽  
Author(s):  
Hu Liu ◽  
Yinhe Liu ◽  
Guangzhou Yi ◽  
Li Nie ◽  
Defu Che
Keyword(s):  
Nox Emission ◽  
Emission Characteristics ◽  
Utility Boiler ◽  
Lean Coal ◽  
Air Staging

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
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