某重型燃气轮机NOx排放性能反应动力学数值计算

doi:10.16183/j.cnki.jsjtu.2017.11.015

摘要/Abstract

摘要： 借助耦合CH4反应动力学模型与计算流体力学(Computational Fluid Dynamics, CFD)计算软件，对某重型燃气轮机燃烧室单个火焰筒的燃烧过程进行了研究，分析了导致NOx排放超标的原因，调整了不同燃烧区的燃料分配，分析了燃料分配对NOx排放的影响.结果表明，导致NOx排放超标的原因为环形区、均匀区燃料/空气混合的不均匀性和值班区、均匀区燃料流量过大导致的局部温度过高；将值班区燃料和均匀区燃料的体积流量比例分别调整为4%和30%，会导致主燃烧区温度升高，NOx排放由标准状态141.7mg/m3升高至175.5mg/m3；将值班区燃料和均匀区燃料比例分别调整为2%和26%，会降低主燃烧区温度，使NOx排放降低至119.5mg/m3，其中66.3mg/m3来自于环形区.单纯地进行燃料调节，不能满足NOx排放要求，还需要对环形区和均匀区结构进行调整，以增加混合的均匀性.

关键词: 重型燃气轮机, 燃料分配, 反应动力学特性, 燃烧特性

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

中图分类号:

TK 401

刘爱虢1，朱悦1，陈保东1，曾文1，翁一武2，刘凯1，王成军1. 某重型燃气轮机NOx排放性能反应动力学数值计算[J]. 上海交通大学学报（自然版）, 2017, 51(11): 1383-1390.

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.

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