Effects of Pilot Fuel Ratio on Combustion Process: Flow Field Structure and Pollutant Emissions

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  • 1. Postdoctoral Station of Mechanical Engineering, Tongji University, Shanghai 201804, China
    2. School of Mechanical Engineering, Tongji University, Shanghai 201804, China

网络出版日期: 2023-11-26

基金资助

This work was supported by the Science and Technology Commission of Shanghai Municipality (20dz1204902).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Effects of Pilot Fuel Ratio on Combustion Process: Flow Field Structure and Pollutant Emissions

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  • 1. Postdoctoral Station of Mechanical Engineering, Tongji University, Shanghai 201804, China
    2. School of Mechanical Engineering, Tongji University, Shanghai 201804, China

Online published: 2023-11-26

Supported by

This work was supported by the Science and Technology Commission of Shanghai Municipality (20dz1204902).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

作为微型燃气轮机燃烧室在机组运行期间的几乎仅有的控制手段,值班比(Pilot Fuel Ratio,PFR)是实现稳定燃烧过程和调控污染物排放的关键措施。本文讨论了值班比对燃烧室内部流场结构和污染物生成特性的影响。本文使用稳态三维雷诺平均应力方法和40步甲烷/空气燃烧骨架机理研究了值班比分别为9.0%、12.7%、15.2%和17.6%时燃烧室内的流场和组分场分布。研究结果表明,随着PFR的降低,燃烧室中心轴附近的轴向速度和温度呈下降趋势。在核心热解反应区(通过HCO测量)和氧化区(通过OH测量)中发生了类似的分离现象。通过在燃烧空气中使用惰性气体代替氮气,得到了值班火焰对氮氧化物(NOx)生成浓度的定量影响。发现在PFR为9.0%的工况下,值班火焰产生的NOx浓度为3.2 ppmv,占总NOx排放量的17.4%。

本文引用格式

ZONG Chao, JI Chenzhen, CHENG Jiaying, ZHU Tong . Effects of Pilot Fuel Ratio on Combustion Process: Flow Field Structure and Pollutant Emissions[J]. 热科学学报, 2023 , 32(6) : 2321 -2335 . DOI: 10.1007/s11630-023-1837-4

Abstract

As the only controllable means of a micro gas turbine (MGT) combustor during unit operation, pilot fuel ratio (PFR) is the key to achieving stable combustion and low pollutant emission. This paper discusses the influence of PFR on the inner flow field structure and pollutant emissions. The steady-state three-dimensional RANS method with a 40-step reduced methane-air kinetics mechanism is used to study the reaction flow field and species field with PFR of 9.0%, 12.7%, 15.2% and 17.6%. Results show that, with the decrease in PFR, the axial velocity and temperature near the central axis of the combustion chamber show a tendency to decrease. A similar separation phenomenon occurred in the core pyrolysis reaction zone (measured by HCO) and oxidation zone (measured by OH), which is more conducive to promoting the oxidation of CO. The quantitative effect of the pilot flame on nitrogen oxides (NOx) was separated by using inert gas instead of nitrogen in combustion air. It was found that the NOx produced by the pilot flame under the operation condition with a PFR of 9.0% was 3.2×10–6, accounting for 17.4% of the total NOx emission, which was twice that of PFR.

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