Empirical Formula to Predict the NOx Emissions from Coal Power Plant using Lab-Scale and Real-Scale Operating Data

The use of fossil fuels has drastically increased throughout the world as the demand for energy increases. Accordingly, it has become critical that we reduce the oxides of nitrogen (NOx) and oxides of sulfur pollutants. Therefore, studies related to these activities have increased. This study was aimed at helping take pre-emptive action on NOx emissions by developing a formula that would predict NOx generation using factors related to the combustion characteristics and basic material properties of coal. In this study, the experiments were conducted using a drop tube furnace, and the correlation between coal’s major characteristics and NOx generation was analyzed and measured. Our results showed that the major factors affecting NOx generation are moisture, fixed carbon, and fuel ratio. Moisture tended to decrease NOx generation by delaying the ignition of coal and fixed carbon exhibited a tendency to be directly proportional to NOx generation. The R2 value for NOx of moisture and fixed carbon were derived as 0.7659 and 0.7063, respectively. Our results also showed that the fuel ratio had an exponential relation with the conversion of fuel-N to NOx. Based on the results of our analyses, we used moisture, fixed carbon, and fuel ratio as the major factors for creating an experimental formula. Through these results, we confirmed that the prediction formula reflects the actual amount of NOx emitted from the powerplants.

[1]  Byoung-Hwa Lee,et al.  Effect of Ash Content on Unburned Carbon and NOx Emission in a Drop Tube Furnace , 2014 .

[2]  Tim C. Keener,et al.  Compositional factors affecting NOx emissions from Ohio coals , 2001 .

[3]  Kevin Davis,et al.  Trends in predicting and controlling ash vaporization in coal-fired utility boilers , 2001 .

[4]  Yingjie Zhong,et al.  Effect of Different Acoustic Parameters on NOx Emissions of Partially Premixed Flame , 2019, Applied Sciences.

[5]  Byoung-Hwa Lee,et al.  Influence of Coal Blending Methods on Unburned Carbon and NO Emissions in a Drop-Tube Furnace , 2011 .

[6]  Jia Wei Chew,et al.  Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion , 2018 .

[7]  Lin Zhao,et al.  Experimental Study on NOx Reduction in Oxy-fuel Combustion Using Synthetic Coals with Pyridinic or Pyrrolic Nitrogen , 2018, Applied Sciences.

[8]  Hisao Makino,et al.  Pulverized coal combustion characteristics of high-fuel-ratio coals , 2004 .

[9]  Masaaki Yoshikawa,et al.  Removal of SOx and NOx over activated carbon fibers , 2000 .

[10]  Chun-Zhu Li,et al.  Formation of NOx and SOx precursors during the pyrolysis of coal and biomass. Part III. Further discussion on the formation of HCN and NH3 during pyrolysis , 2000 .

[11]  Jingcheng Wang,et al.  Optimal Design of a Tower Type SCR-deNOx Facility for a 1000 MW Coal-Fired Power Plant Based on CFD Simulation and FMT Validation , 2019, Applied Sciences.

[12]  A. Kokkinos,et al.  Stationary combustion NOX control : a summary of the 1991 symposium , 1991 .

[13]  Chung-Hwan Jeon,et al.  Experimental Model Development of Oxygen-Enriched Combustion Kinetics on Porous Coal Char and Non-Porous Graphite , 2017 .

[14]  Tadaaki Shimizu,et al.  Conversion of char-bound nitrogen to nitric oxide during combustion , 1992 .

[15]  J. Azevedo,et al.  EXPERIMENTAL CHARACTERIZATION OF AN INDUSTRIAL PULVERIZED COAL-FIRED FURNACE UNDER DEEP STAGING CONDITIONS , 2007 .

[16]  János M. Beér,et al.  Modeling of NOx reburning in a pilot scale furnace using detailed reaction kinetics , 1998 .

[17]  Peter Mock,et al.  Experimental Assessment of NOx Emissions from 73 Euro 6 Diesel Passenger Cars. , 2015, Environmental science & technology.

[18]  W. Fiveland,et al.  Use of numerical modeling in the design of a low-NOx burner for utility boilers , 1993 .