The mechanisms of flame stabilization and low NOx emission in an eccentric jet pulverized coal combustor

1992 ◽  
Vol 1 (4) ◽  
pp. 278-285
Author(s):  
Wenchao Sun ◽  
Yezhu Sun ◽  
Feng Qin ◽  
Chengkang Wu
Keyword(s):  
Flame Stabilization ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Low Nox Emission

Application Analysis on the Bias and Air Staged Combustion Technology in the Opposed Firing Boiler

2011 ◽  
Author(s):  
Tai-sheng Liu
Keyword(s):  
Recirculation Zone ◽  
Nox Reduction ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Unburned Carbon ◽  
Staged Combustion ◽  
Bias Model ◽  
Combustion Technology ◽  
Radial Model ◽  
Low Nox Emission

The bias combustion technology has been widely used in the swirling burner. Take the distribution of the pulverized-coal concentration at the primary air outlet as the division principle, there are three kinds of bias combustion models: radial model with inside dense and outside lean, radial model with outside dense and inside lean, and circumferential model. Considering stable ignition and low NOx emission, at the phase of the pulverized-coal ignition, the dense pulverized-coal flow should be heated by the high temperature flue gas intensively and quickly to ensure the coal’s timely ignition and form an In-flame NOx reduction zone for low NOx emission. Hence the bias combustion technology should be in accordance with the recirculation zone. So the radial bias model with inside dense and outside lean suits to central recirculation zone while radial bias model with outside dense and inside lean suits to annular recirculation zone. The circumferential bias model suits to both recirculation zones. Furthermore, appropriate measures should be taken on the burner’s arrangement and furnace’s design to prevent the obvious increase of slagging problem and unburned carbon in fly ash when using bias and air staged combustion technology.

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

Analysis of air-staged combustion of NH3/CH4 mixture with low NOx emission at gas turbine conditions in model combustors

Fuel ◽  
2019 ◽  
Vol 237 ◽  
pp. 50-59 ◽  
Author(s):  
Shan Li ◽  
Shanshan Zhang ◽  
Hua Zhou ◽  
Zhuyin Ren
Keyword(s):  
Gas Turbine ◽  
Nox Emission ◽  
Staged Combustion ◽  
Low Nox Emission

Strategies for Meeting Phase 2 GHG and Ultra-Low NOx Emission Standards for Heavy-Duty Diesel Engines

2018 ◽  
Vol 11 (6) ◽  
pp. 1109-1122 ◽  
Author(s):  
Mufaddel Dahodwala ◽  
Satyum Joshi ◽  
Erik W. Koehler ◽  
Michael Franke ◽  
Dean Tomazic
Keyword(s):  
Diesel Engines ◽  
Nox Emission ◽  
Phase 2 ◽  
Heavy Duty ◽  
Emission Standards ◽  
Heavy Duty Diesel ◽  
Low Nox Emission
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