Optimization of operating conditions to achieve combustion stability and reduce NOx emission at half-load for a 550-MW tangentially fired pulverized coal boiler

Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121727
Author(s):  
Yu Jiang ◽  
Byoung-Hwa Lee ◽  
Dong-Hun Oh ◽  
Chung-Hwan Jeon
Keyword(s):  
Pulverized Coal ◽  
Operating Conditions ◽  
Nox Emission ◽  
Combustion Stability ◽  
Pulverized Coal Boiler ◽  
Coal Boiler

scholarly journals Methane Gas Cofiring Effects on Combustion and NOx Emission in 550 MW Tangentially Fired Pulverized-Coal Boiler

ACS Omega ◽  
2021 ◽  
Author(s):  
Kang-Min Kim ◽  
Gyu-Bo Kim ◽  
Byoung-Hwa Lee ◽  
Chung-Hwan Jeon ◽  
Joon-Ho Keum
Keyword(s):  
Pulverized Coal ◽  
Nox Emission ◽  
Methane Gas ◽  
Pulverized Coal Boiler ◽  
Coal Boiler

Effect of Slot Wall Jet on Combustion Process in a 660 MW Opposed Wall Fired Pulverized Coal Boiler

2019 ◽  
Vol 17 (4) ◽  
Author(s):  
Yong Zhang ◽  
Yao Fang ◽  
Baosheng Jin ◽  
Youwei Zhang ◽  
Chunlei Zhou ◽  
...  
Keyword(s):  
Combustion Process ◽  
Side Wall ◽  
Pulverized Coal ◽  
Operating Conditions ◽  
Gas Velocity ◽  
Pulverized Coal Boiler ◽  
Inclination Angles ◽  
Secondary Air ◽  
Coal Boiler ◽  
Optimized Conditions

Abstract Numerical investigations of an anti-corrosion design and the combustion process (original conditions and optimal conditions) were conducted for a 660 MW opposed wall fired boiler. In order to solve high-temperature corrosion of the side wall, a scheme was proposed: slotting in the side wall and introducing air (closing-to-wall air) from the secondary air. The effect of anti-corrosion was disclosed in detail by varying the structures of slotting, gas velocities from nozzles and jet inclination angles. The temperature and NOx distribution in the furnace at optimized conditions were compared with those at the original operating conditions. Simulation results showed that the structures of the slot and gas velocities from the nozzles had a marked effect on anti-corrosion of the side wall. When the gas velocity was 4 m/s, an inclination angle of the gas velocity was not conducive to anti-corrosion of the side wall. When the gas velocity increased at the middle and bottom of the side wall, the anti-corrosion effect increased significantly. When the optimal scheme was adopted, the corrosion area of the side wall decreased obviously, but the furnace temperature and the NOx emission increased slightly. The detailed results of this work promote a full understanding of closing-to-wall air and could help to reduce the corrosive area in pulverized-coal furnaces or boilers.

Numerical Analysis of Influence of SOFA on NOx Emissions for Pulverized Coal Boiler

2016 ◽  
Author(s):  
Xiangcun Qi ◽  
Mo Yang ◽  
Yuwen Zhang
Keyword(s):  
Internal Combustion ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Front Wall ◽  
Nox Emissions ◽  
Rear Wall ◽  
Pulverized Coal Boiler ◽  
Optimal Value ◽  
Production Increase ◽  
Coal Boiler

Influences of different SOFA ratios on NOx emission in a tower pulverized coal fired boiler that burners are arranged in the front and the rear wall are investigated in this paper. The front wall is arranged with three layers of burners, and the rear wall is arranged with two layers of burners. The upper layers are the SOFA nozzles. We adopt the method of adding SOFA to reduce NOx emission, and analyze the influence of SOFA on the internal combustion and NOx emissions for pulverized coal boiler. The results show that the addition of SOFA makes the pulverized coal fired boiler form a reduction zone in the main combustion zone, which can inhibit the NOx production increase, so as to achieve the goal of reducing NOx emissions. And the results show that, it is not true that the more SOFA ratio, the less NOx emissions. In fact, the percentage of SOFA has an optimal value, and below or above of this value, NOx yield will increase. Through comparison of different ratios of SOFA distribution modes with the furnace temperature, O2, CO and NOx, we analyze the influence of SOFA ratio on the internal combustion for pulverized coal boiler, and provide some guidance and bases for the optimization of other similar units.

scholarly journals Improving Blowout Performance of the Conical Swirler Combustor by Employing Two Parts of Fuel at Low Operating Condition

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1681
Author(s):  
Yixiang Yuan ◽  
Qinghua Zeng ◽  
Jun Yao ◽  
Yongjun Zhang ◽  
Mengmeng Zhao ◽  
...  
Keyword(s):  
Distribution Ratio ◽  
Performance Enhancement ◽  
Experimental Testing ◽  
Stability Boundary ◽  
Operating Conditions ◽  
Nox Emission ◽  
Combustion Stability ◽  
Gas Temperature ◽  
Contact Ratio ◽  
Fuel Distribution

Aiming at the problem of the narrow combustion stability boundary, a conical swirler was designed and constructed based on the concept of fuel distribution. The blowout performance was studied at specified low operating conditions by a combination of experimental testing and numerical simulations. Research results indicate that the technique of the fuel distribution can enhance the combustion stability and widen the boundary of flameout within the range of testing conditions. The increase of the fuel distribution ratio improves the combustion stability but leads to an increase in NOx emission simultaneously. The simulation results show the increase of the fuel distribution ratio causes contact ratio increase in the area of lower reference velocity and gas temperature increase. The increased contact ratio and temperature contribute to the blowout performance enhancement, which is identical to the analysis result of the Damkohler number. The reported work in this paper has potential application value for the development of an industrial burner and combustor with high stability and low NOx emission, especially when the combustion system is required to be stable and efficient at low working conditions.

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