Comparative study of flame structures and NOx emission characteristics in fuel injection recirculation and fuel gas recirculation combustion system

2004 ◽  
Vol 28 (10) ◽  
pp. 861-885 ◽  
Author(s):  
Jeong Park ◽  
Dong-Jin Hwang ◽  
Jin-Oh Chung ◽  
Sang-In Keel ◽  
Sung-Hoon Shim ◽  
...  
Keyword(s):  
Comparative Study ◽  
Fuel Injection ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Combustion System ◽  
Fuel Gas ◽  
Flame Structures ◽  
Gas Recirculation

scholarly journals Emission characteristics of iso-propanol/gasoline blends in a spark-ignition engine combined with exhaust gas re-circulation

2014 ◽  
Vol 18 (1) ◽  
pp. 269-277 ◽  
Author(s):  
Jing Gong ◽  
Yingjia Zhang ◽  
Chenglong Tang ◽  
Zuohua Huang
Keyword(s):  
Particulate Matter ◽  
Exhaust Gas Recirculation ◽  
Spark Ignition ◽  
Number Concentration ◽  
Spark Ignition Engine ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Exhaust Gas ◽  
Recirculation Rate ◽  
Gas Recirculation

Experiments were carried out in a spark-ignition engine fueled with iso-propanol/gasoline blends. Emission characteristics of this engine were investigated experimentally, including gaseous emissions (HC, CO, NOx) and particulate matter emission in term of number and size distributions. The effects of different iso-propanol percentages, loads and exhaust gas recirculation rates on emissions were analyzed. Results show that the introduction of exhaust gas recirculation reduces the NOx emission and NOx emission gives the highest value at full load condition. HC and CO emissions present inconspicuous variations at all the loads except the load of 10%. Additionally, HC emission shows a sharp increase for pure propanol when the exhaust gas recirculation rate is up to 5%, while little variation is observed at lager exhaust gas recirculation rates. Moreover, the particulate matter number concentration increases monotonically with the increase of load and the decrease of exhaust gas recirculation rate. There exists a critical spark timing that produces the highest particulate matter number concentration at all the blending ratios.

EMISSION CHARACTERISTICS OF DOUBLE SWIRL COMBUSTION SYSTEM FOR A DIESEL ENGINE

2016 ◽  
Vol 15 (7) ◽  
pp. 1611-1616
Author(s):  
Xiangrong Li ◽  
Liwang Su ◽  
Haobu Gao ◽  
Luming Zhao ◽  
Fushui Liu
Keyword(s):  
Diesel Engine ◽  
Emission Characteristics ◽  
Combustion System ◽  
Swirl Combustion

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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