Reaction Kinetic Simulation of NOx Emission Performance for a Heavy Duty Gas Turbine

doi:10.16183/j.cnki.jsjtu.2017.11.015

Abstract

Abstract: The combustion process of single chamber flame tube of a heavy duty gas turbine combustor is studied by coupling of CH4 reaction kinetics model and computational fluid dynamics (CFD) software. Analysis of the causes of excessive NOx emissions is completed. The fuel distribution in different combustion zones is adjusted to study the effect of fuel distribution on NOx formation. Results show that high NOx emissions are due to high temperature caused by the fuel/air mixing ununiformity in annular and uniform zones and the fuel flow is too high in the main combustion zone. Adjusting the fuel flow of pilot zone and uniform zone respectively to 4% and 30% can increase the NOx emission from 141.7mg/m3 to 175.5mg/m3. Adjusting the fuel flow of pilot zone and annular zone respectively to 2% and 26% can decrease the NOx emission to 119.5mg/m3, in which 66.3mg/m3 is from the annular region. The requirement of NOx emissions cannot be met only by adjusting the fuel distribution, but also by adjusting the structure of the annular and uniform zones to increase mixing uniformity.

Key words: heavy duty gas turbine, fuel distribution, reaction kinetic characteristics, combustion performance

CLC Number:

TK 401

LIU Aiguo1,ZHU Yue1,CHEN Baodong1,ZENG Wen1,WENG Yiwu2,LIU Kai1,WANG Chengjun1. Reaction Kinetic Simulation of NOx Emission Performance for a Heavy Duty Gas Turbine [J]. Journal of Shanghai Jiaotong University, 2017, 51(11): 1383-1390.

References

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