Influence of overfire air rate of the two‐channel overfire air on flow and combustion characteristics in a 600‐MWe boiler

Wang, Haopeng; Ti, Shuguang; Jin, Haoze; Wang, Hong; Gao, Ke; Liu, Yang; Li, Jinfeng

doi:10.1002/apj.2726

Asia-Pacific J Chem Eng

2021

DOI: 10.1002/apj.2726

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Influence of overfire air rate of the two‐channel overfire air on flow and combustion characteristics in a 600‐MWe boiler

Haopeng Wang

Shuguang Ti

Haoze Jin

et al.

Abstract: To solve the problem of high NO x emission of 600-MWe boilers in power plants, we established a cold gas-solid modeling testbed scaled by 1:5 for twochannel overfire air (OFA). A phase-Doppler anemometer was used to measure the characteristics of the outlet flow field of the two-channel OFA under different OFA rates. We also verified the industrial feasibility of this testbed under loads of 300 and 600 MWe. The influence of the OFA rate on the divergence angle of the outlet jet was small: When the OFA rate was… Show more

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2024

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Cited by 3 publications

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Experimental combustion characteristics and NO_x emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation

Wang,

Deng,

et al. 2024

Asia-Pacific J Chem Eng

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To enhance the rapid switching ability of the boiler load and reduce NOx emissions, a new combustion system was implemented in a 600‐MWe wall‐fired boiler with swirl burners. This system included two levels of overfire air (OFA) and low NOx combustion technology. Industrial tests were conducted at 300‐, 450‐, and 600‐MWe loads before and after the retrofitted. These tests included measuring flue gas and furnace temperatures with thermocouples and analyzing local gas concentrations using a gas analyzer. The research results indicate that under conditions where the OFA ratio exceeds 30%, the burner exhibits good ignition performance at different loads. At the 600‐MWe load, the nitrogen oxides (NOx) emissions were reduced by 55% compared to before the retrofit. After the retrofit, the flame center inside the furnace of different loads was located at the height of 33.36 m, the first and second‐stage cooling water quantities were slightly higher, the reheat cooling water quantity was greatly reduced after the retrofit, and contributes to the boiler's safe operation. Under different load conditions after the retrofit, the gas temperature near the sidewall was below 850°C, and the O2 concentration near the sidewall was above 5%, effectively suppressing sidewall high‐temperature corrosion and slagging.

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Experimental combustion characteristics and NO_x emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation

Wang,

Deng,

et al. 2024

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

Industrial experimental study on combustion characteristics and NOx emission characteristics of a 600 MWe wall‐fired boiler under ultra‐low excess air coefficient conditions

Ti,

Deng,

Yang

et al. 2024

Asia-Pacific J Chem Eng

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This paper aims to explore the effects of ultra‐low excess air coefficients on the combustion performance and NOx emission characteristics of coal‐fired boilers through industrial experiments conducted on a 600 MWe wall‐fired boiler. The results indicate that the burners demonstrate good ignition performance under different ultra‐low excess air coefficient conditions. As the excess air coefficient increases, the temperature in the main combustion zone rises, and the ignition distance of pulverized coal shortens. Under ultra‐low excess air coefficient conditions (such as 1.04), the unburned carbon content in fly ash reaches 5.50%, which is 3.23% higher than under the condition of 1.11, indicating poor pulverized coal burnout. When the excess air coefficient is close to the theoretical design value (such as 1.11), the carbon content in slag and the unburned carbon content in fly ash is relatively low (1.40% and 2.28%, respectively), indicating more complete combustion of pulverized coal. Additionally, the flue gas temperature at the air preheater outlet under this condition is relatively low; compared to the condition of an excess air coefficient of 1.07, the flue gas temperature is reduced by 6°C, thus reducing flue gas loss. Although the NOx concentration under the condition of an excess air coefficient of 1.11 is slightly higher, the quantity of cooling water is less. Flow field tracking of the powder verifies the flow path and characteristics of the primary air of the burners, and the results show that the primary air flow path of the burners is relatively concentrated, avoiding impingement on the water‐cooled walls and effectively preventing slagging issues on the water‐cooled walls. The research findings are of great significance for improving the operational performance and environmental protection level of coal‐fired boilers.

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Numerical Simulation of the OFA Effect on Combustion in a 600 MWe Boiler with Centrally Fuel Rich Burners

Wu,

Liu,

et al. 2024

Combustion Science and Technology

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Influence of overfire air rate of the two‐channel overfire air on flow and combustion characteristics in a 600‐MWe boiler

Cited by 3 publications

References 19 publications

Experimental combustion characteristics and NO_x emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation

Experimental combustion characteristics and NO_x emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation

Industrial experimental study on combustion characteristics and NOx emission characteristics of a 600 MWe wall‐fired boiler under ultra‐low excess air coefficient conditions

Numerical Simulation of the OFA Effect on Combustion in a 600 MWe Boiler with Centrally Fuel Rich Burners

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Influence of overfire air rate of the two‐channel overfire air on flow and combustion characteristics in a 600‐MWe boiler

Cited by 3 publications

References 19 publications

Experimental combustion characteristics and NOx emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation

Experimental combustion characteristics and NOx emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation

Industrial experimental study on combustion characteristics and NOx emission characteristics of a 600 MWe wall‐fired boiler under ultra‐low excess air coefficient conditions

Numerical Simulation of the OFA Effect on Combustion in a 600 MWe Boiler with Centrally Fuel Rich Burners

Contact Info

Product

Resources

About

Experimental combustion characteristics and NO_x emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation

Experimental combustion characteristics and NO_x emissions for a 600‐MWe utility boiler after the retrofitted: Effects of load variation