Mechanical Engineering Science

Influence of Recirculated Flue Gas Distribution on Combustion and NOx Formation Characteristics in S-CO2 Coal-fired Boiler

WANGPeipei, GUMingyan, FANGYao, JIANGBoyu, WANGMingming, CHENPing

Abstract


Supercritical carbon dioxide (S-CO2 ) Brayton power cycle power generation technology, has attracted more and more scholars' attention in recent years because of its advantages of high efficiency and flexibility. Compared with conventional steam boilers, S-CO2 has different heat transfer characteristics, it is easy to cause the temperature of the cooling wall of the boiler to rise, which leads to higher combustion gas temperature in the furnace, higher NOX generation concentration. The adoption of flue gas recirculation has a significance impact on the combustion process of pulverized coal in the boiler, and it is the most effective ways to reduce the emission of NOX and the combustion temperature in the boiler. This paper takes 1000MW S-CO2 T-type coal-fired boiler as the research target to investigate the combustion and NOX generation characteristics of S-CO2 coal-fired boilers under flue gas recirculation condition, the influence of recirculated flue gas distribution along the furnace height on the characteristics of NOX formation and the combustion of pulverized coal. The results show that the recirculated flue gas distribution has the great impact on the concentration of NOX at the boiler outlet. When the bottom recirculation flue gas rate is gradually increased, the average temperature of the lower boiler decreases and the average temperature of the upper boiler increases slightly; The concentration of NOx at the furnace outlet increases.

Keywords


S-CO2 boiler; Pulverized coal combustion; NOX emission; Flue gas recirculation; Recirculated flue gas distribution

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DOI: https://doi.org/10.33142/mes.v3i2.6728

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