In this present work, simulations of 20 kW furnace were carried out with hydrogen-enriched methane mixtures, to identify optimal geometrical configurations and operating conditions to operate in flameless combustion regime. The objective of this work is to show the advantages of flameless combustion for hydrogen-enriched fuels and the limits of current typical industrial designs for these mixtures. The performances of a semi-industrial combustion chamber equipped with a self-recuperative flameless burner are evaluated with increasing H₂ concentrations. For highly H₂-enriched mixtures, typical burners employed for methane appear to be inadequate to reach flameless conditions. In particular, for a typical coaxial injector configuration, an equimolar mixture of hydrogen and methane represents the limit for hydrogen enrichment. To achieve flameless conditions, different injector geometries and configuration were tested. Fuel dilution with CO₂ and H₂O was also investigated. Dilution slows the mixing process, consequently helping the transition to flameless conditions. CO₂, and H₂O are typical products of hydrogen generation processes, therefore their use in fuel dilution is convenient for industrial applications. Dilution thus allows the use of greater hydrogen percentages in the mixture.

在本工作中，使用富氢甲烷混合物对20 kW炉进行了模拟，以确定在无焰燃烧状态下运行的最佳几何构型和运行条件。这项工作的目的是展示富氢燃料无焰燃烧的优势以及这些混合物当前典型的工业设计的局限性。在H ₂浓度增加的情况下，对配备有自循环式无焰燃烧器的半工业燃烧室的性能进行了评估。对于高H ₂-富集混合物，用于甲烷的典型燃烧器似乎不足以达到无焰条件。特别地，对于典型的同轴喷射器构造，氢和甲烷的等摩尔混合物代表了氢富集的极限。为了达到无焰条件，测试了不同的喷射器几何形状和配置。还研究了用CO ₂和H ₂ O稀释燃料。稀释会减慢混合过程，从而有助于过渡到无焰条件。CO ₂和H ₂ O是制氢过程的典型产物，因此它们在燃料稀释中的使用方便工业应用。因此，稀释允许在混合物中使用更大的氢百分比。