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柔和燃烧具备燃烧稳定、烟气出口温度均匀、NO和CO排放低的特点,有望成为新一代燃气轮机燃烧技术。因此,开展柔和燃烧技术应用于燃气轮机燃烧室的探索研究非常必要。烟气温度、氧浓度及其与新鲜空气的掺混对柔和燃烧的发生及燃烧性能有重要影响。为此,基于轴向分级概念建立燃烧器,通过精确控制烟气回流比例和当量比使得烟气的流量、温度、氧浓度连续可调,设计合适的燃烧器结构型式使得烟气在掺混区和燃料、空气以交叉射流方式掺混。通过数值模拟结合实验的方法,从流动、热力学角度研究分析了回流比例、当量比对OH﹡分布、火焰稳定性、NO/CO排放等燃烧性能的影响规律和机制。实验以甲烷为燃料,在回流比例r 0.5、当量比0.6工况下获得最佳的污染物排放性能:NO为6 mg/m3,CO为5 mg/m3。研究结果将为柔和燃烧在燃气轮机燃烧室上的应用提供理论依据和基础数据。
Soft combustion with combustion stability, flue gas outlet temperature uniformity, NO and CO emissions is low, is expected to become a new generation of gas turbine combustion technology. Therefore, it is necessary to carry out the research of soft combustion technology applied to gas turbine combustor. Flue gas temperature, oxygen concentration and its blending with fresh air have a significant impact on the occurrence of soft combustion and combustion performance. Therefore, based on the concept of axial classification, a burner is set up. By precisely controlling the proportion and equivalence ratio of flue gas backflow, the flue gas flow rate, temperature and oxygen concentration can be continuously adjusted. A suitable burner structure is designed so that flue gas is mixed in the mixing zone Mix with fuel and air in a cross-jet manner. Through the numerical simulation combined with experimental methods, the influence law and mechanism of reflux ratio, equivalence ratio on combustion performance such as OH * distribution, flame stability, NO / CO emission and so on were analyzed from the aspects of flow and thermodynamics. Experiments using methane as fuel, at the reflux ratio r0.5, the equivalent ratio of 0.6 operating conditions to obtain the best pollutant emission performance: NO 6 mg / m3, CO 5 mg / m3. The results will provide the theoretical basis and basic data for the application of soft combustion in the combustion chamber of gas turbine.