04/01993 NOx formation in swirl coal burner with pulverized-coal concentrator

2004 ◽  
Vol 45 (4) ◽  
pp. 275
Keyword(s):  
Pulverized Coal ◽  
Nox Formation

scholarly journals Large-eddy simulation of pulverized coal jet flame – Effect of oxygen concentration on NOx formation

Fuel ◽  
2015 ◽  
Vol 142 ◽  
pp. 152-163 ◽  
Author(s):  
Masaya Muto ◽  
Hiroaki Watanabe ◽  
Ryoichi Kurose ◽  
Satoru Komori ◽  
Saravanan Balusamy ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Oxygen Concentration ◽  
Pulverized Coal ◽  
Nox Formation ◽  
Jet Flame ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Effect Of Oxygen

High Tech Tool for Combustion Optimization and Economic Emissions Reductions

2003 ◽  
Author(s):  
Guido Elsen ◽  
Alan D. Jensen ◽  
Axel Boehme ◽  
Jens Happel
Keyword(s):  
Air Flow ◽  
Operating Cost ◽  
Pulverized Coal ◽  
Measuring System ◽  
Unburned Carbon ◽  
High Tech ◽  
Nox Formation ◽  
Flow Measurements ◽  
Time Flow ◽  
Coal Flow

The power generation industry is currently in a very difficult period of business restructuring. All the while, the demands to reduce emissions of NOx, SOx and particulates in accordance with the Clean Air Act continue. The high capital and operating cost of post-combustion NOx controls like Selective Catalytic Reduction (SCR) is leading to greater interest in finding methods to reduce NOx formation during combustion. The most cost effective means of reducing any pollutant is to never form it in the first place. The science behind combustion NOx control uses techniques which limit the amount of air available in the high temperature combustion zones where thermal NOx forms. Minimum NOx formation occurs when fuel and air mixing are carefully controlled to maintain required stoichiometric ratios. Additionally, controlling coal and air flow minimizes excess air requirements, can reduce unburned carbon resulting in better electrostatic precipitator performance and improved overall boiler efficiency. Thus maintaining fuel and air flow at optimal levels becomes a major concern if one wishes to achieve minimum NOx formation during combustion and maintain optimum boiler performance throughout the units load range. Since pulverized coal is transported by primary air in a two phase flow it has been difficult, if not impossible, in the past to measure coal mass flow on a continuous basis. Typically, coal flow and fineness have been measured on an intermittent basis using extractive techniques. This paper serves to introduce a real-time “flow measuring system” for pulverized coal, based on the use of microwave technology. It will describe how microwaves are used to obtain very accurate coal flow measurements. Comparisons of data obtained using the microwave system will be made with measurements obtained using extractive isokinetic methods. Some relevant operational effects from both US and German installations will be discussed and projections of operational savings will be made especially when using the system on an SCR equipped installation.

A role of hydrocarbon reaction for NOx formation and reduction in fuel-rich pulverized coal combustion

2010 ◽  
Vol 157 (8) ◽  
pp. 1456-1466 ◽  
Author(s):  
Masayuki Taniguchi ◽  
Yuki Kamikawa ◽  
Teruyuki Okazaki ◽  
Kenji Yamamoto ◽  
Hisayuki Orita
Keyword(s):  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Nox Formation

scholarly journals Coal Composition Effects on NOx Formation during Initial Stage of Pulverized Coal Combustion.

1993 ◽  
Vol 19 (3) ◽  
pp. 496-504 ◽  
Author(s):  
Shinji Kambare ◽  
Takayuki Takarada ◽  
Nobuyoshi Nakagawa ◽  
Kunio Kato
Keyword(s):  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Nox Formation ◽  
Composition Effects ◽  
Initial Stage ◽  
Coal Composition

scholarly journals Numerical simulation study on the influence of pulverized coal particle size on boiler combustion characteristics

2020 ◽  
Vol 218 ◽  
pp. 01009
Author(s):  
Zhihai Cheng ◽  
Yang Li ◽  
Zhonghan Zhang
Keyword(s):  
Numerical Simulation ◽  
Particle Size ◽  
Combustion Zone ◽  
Coal Particle ◽  
Average Particle Size ◽  
Pulverized Coal ◽  
Average Particle ◽  
Temperature Level ◽  
Nox Formation ◽  
Average Temperature

The influence of pulverized coal particle size on combustion and NOx formation of 660MW tangential combustion ultra-supercritical boiler in a power plant was studied by using commercial software FLUENT. The average particle size of pulverized coal was set at 61μm, 71μm and 80μm, respectively. The results show that with the decrease of pulverized coal particle size, the overall temperature level of the boiler increases, the average temperature of the main combustion zone increases, the temperature of the upper part of the main combustion zone decreases, and the combustion of pulverized coal is more incomplete. However, the probability of particles sticking to the wall and the probability of coking and slagging of the boiler increases. The amount of NOx produced in the main combustion zone decreases, while the amount of NOx produced in the upper part of the main combustion zone increases, while the overall amount of NOx produced increases slightly.

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