Review of gas/particle flow, coal combustion, and NOx emission characteristics within down-fired boilers

Energy ◽  
2014 ◽  
Vol 69 ◽  
pp. 144-178 ◽  
Author(s):  
Min Kuang ◽  
Zhengqi Li
Keyword(s):  
Coal Combustion ◽  
Nox Emission ◽  
Particle Flow ◽  
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

Study on the emission characteristics of nitrogen oxides with coal combustion in pressurized fluidized bed

2019 ◽  
Vol 27 (5) ◽  
pp. 1177-1183 ◽  
Author(s):  
Zheng Gong ◽  
Yingjuan Shao ◽  
Lei Pang ◽  
Wenqi Zhong ◽  
Chao Chen
Keyword(s):  
Nitrogen Oxides ◽  
Fluidized Bed ◽  
Coal Combustion ◽  
Emission Characteristics

Effect of Cetane Number Improver on Emission Characteristics of Methanol/Diesel Blend Fuel

2012 ◽  
Vol 512-515 ◽  
pp. 1888-1891
Author(s):  
Jia Yi Du ◽  
Wei Xun Zhang ◽  
Deng Pan Zhang ◽  
Zhen Yu Sun
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Cetane Number ◽  
Nox Emission ◽  
Fuel Load ◽  
Emission Characteristics ◽  
Soot Emission ◽  
Maximum Torque ◽  
Blend Fuel ◽  
Co Emission

The influence of cetane number improver on emission characteristics of diesel engine fueled with methanol/diesel blend fuel was investigated. Methanol/diesel blend fuel was prepared, in which the methanol content is 10%, different mass fraction (0%，0.5%) of cetane number improver were added to the blend fuel. Load characteristic experiments at maximum torque speed of the engine were carried out on 4B26 direct injection diesel engine. The results show that, compared with the engine fueled with diesel, the CO emission increases under low loads and reduces under medium and high loads, the HC emission increases, the NOx emission decreases under medium and low loads and increases under high loads, the soot emission reduces significantly when the diesel engine fueled with blends. When cetane number improver was added to blends, the CO and NOx emission reduces, the HC emission decreases, the soot emission increases to some extent compared with the methanol/dieselblend fuel without cetane number improver.

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