燃气轮机燃烧室化学反应器网络模型研究

本文针对CFD燃烧室设计方法在计算时间以及计算的准确度上的不足,发展了一种计算量较小的、能够快速准确地预测燃气轮机燃烧室污染物排放的化学反应器网络模型方法(CRN).该方法首先根据CFD的计算结果对燃烧室进行分区,不同的区域采用不同的化学反应器模型进行模拟,反应器之间的连接关系以及入口参数都根据CFD的结果确定.本文采用这种方法对某个燃烧富氢合成气的重型燃气轮机燃烧室的NO_x排放随燃料加湿量的变化进行了预测,并与现场测量的结果进行了比较.计算结果与现场试验数据吻合得很好,证明这是一种很好的预测燃烧室NO_x排放的方法,与CFD方法相比预测精度有了很大提高,而且在计算时间上小了几个数量级.

CHEMICAL REACTOR NETWORK APPROACH FOR A GAS TURBINE COMBUSTOR

This work develops chemical reactor networks approach(CRN)with a low computational effort,short time and precise result to predict NO_x emissions from an industrial gas turbine to amend the defect of the computed time and precision with traditional CFD method for combustor designs.Firstly,the space in a combustor is divided into several difierent subspaces based on CFD results.Secondly,difierent chemical reactor models are applied to simulate reactions in different subspaces.Finally,the connections among all the reactors and the inlet parameters are given by CFD results.This work adopts the CRN method to predict the changes of NO_x emissions from a combustor outlet with fuel-steam dilution.The simulated results are compared with the experimental ones.The NO_xemissions predicted with CRN approach are consistent with the experimental results.The CRN approach is proven efficient to evaluate exhaust emissions of a gas turbine combustor.The precisions of the CRN results are greatly improved compared with CFD results.Typically,the computational time is less by several orders of magnitude than that with CFD method.