燃气轮机罐式燃烧室掺氢燃烧数值模拟

Numerical Simulation of Hydrogen-Blended Combustion in a Gas Turbine Can-Type Combustor

摘要

针对以天然气为燃料的燃气轮机在高掺氢比条件下的燃烧及排放特性开展研究,基于雷诺应力模型(RSM)以及非预混燃烧模型,在恒定燃料质量流量条件下,分析不同掺氢比(体积分数α_H2＝0～0.8,共5组)对某罐式燃烧室性能的影响．结果表明:当掺氢比增加到0.8时,燃烧室内部流速提升,但中心回流区面积受到压缩；燃烧室内部最高温度、壁面温度和出口温度均有升高,中心区域火焰宽度增加,出口温度均匀性得到改善(出口温度分布系数降低约24%)；CO₂排放降低36.95%,同时H₂O和NO_x排放量显著增加．本研究可为燃气轮机掺氢设计与运行提供参考．

Abstract

A study was conducted on the combustion and emission characteristics of a gas turbine fueled by natural gas at a high hydrogen-blending ratio. Based on the Reynolds stress model(RSM)and non-premixed combustion model,the impact of different hydrogen-blending ratios(volume fraction α_H2＝0—0.8,five groups in total)on the performance of a can-type combustor was analyzed under constant fuel mass flow. The results show that when the hydrogen-blending ratio increases to 0.8,the internal flow velocity of the combustor rises,but the area of the central recirculation zone is compressed. The maximum internal temperature,wall temperature,and outlet temperature of the combustor all increase,with the flame width in the central region expanding and the outlet temperature uniformity improving(outlet temperature distribution factor decreases by approximately 24%). CO₂ emissions are reduced by 36.95%,while H₂O and NO_x emissions increased significantly. This study can serve as a reference for the design and operation of hydrogen-blended gas turbines.

关键词

燃气轮机 / 掺氢 / 燃烧特性 / 排放特性

Key words

gas turbine / hydrogen-blended / combustion characteristics / emission characteristics

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基金资助

国家储能产教平台资助项目(XM9980)