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首页> 外文会议>6th European Conference on Industrial Furnaces and Boilers Vol.3, Apr 2-5, 2002, Estoril-Lisboa, Portugal >Investigations on ignition stability of partially premixed turbulent natural gas flames for firing industrial boilers
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Investigations on ignition stability of partially premixed turbulent natural gas flames for firing industrial boilers

机译：工业锅炉部分预混湍流天然气火焰着火稳定性的研究

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Firing of industrial water heaters and boilers requires compact, high-intensity flames with burnout contours well adapted to the combustion chamber geometry, and with high heat transfer rates to the water/steam tube system. Ignition stability near to the burner mouth must be achieved over a wide range of firing rates under near stoichiometric lean combustion conditions. In cooperation with several European partners from industry and universities Karlsruhe University has performed experimental research on the effectiveness and optimisation of disc stabilized of natural gas flames in the frame of the EU-project MECBURN (Advanced Burner Design Methodology). The paper reports the results of the Karlsruhe part of the project, which was to examine the mechanisms of controlling flame stability and in particular, to investigate the effect of partial natural gas and air mixing as well as fuel gas and air splitting between a central and an annular duct at the burner exit. As a major result it can be stated that the burner configuration investigated offers superior stability behavior compared to the usual disc stabilized nonpremixed burner concept. The stability limits in terms of design and operational parameters can be explained on the basis of flow and mixing patterns, characterised by the occurrence of a double-toroidal vortex configuration in the burner-near field. This configuration was measured in detail as to velocity (LDV) and by temperature / gas sampling probing inside the flames. The results of these tests, carried out in the heat power range about 200 kW, will also be used to establish and validate scale-up design rules for large burners up to about 7000 kW, as investigated experimentally by industrial partners organisations within the MECBURN project.
机译：工业热水器和锅炉的燃烧需要紧凑，高强度的火焰，其燃烧轮廓非常适合燃烧室的几何形状，并且对水/蒸汽管系统的传热率很高。在接近化学计量的稀薄燃烧条件下，必须在较宽的燃烧速率范围内达到靠近燃烧嘴的点火稳定性。卡尔斯鲁厄大学与来自工业和大学的几个欧洲合作伙伴合作，在欧盟项目MECBURN（高级燃烧器设计方法）的框架内，进行了针对天然气火焰圆盘稳定效果和优化的实验研究。该文件报告了该项目的卡尔斯鲁厄部分的结果，该部分旨在研究控制火焰稳定性的机制，特别是研究部分天然气和空气混合以及燃料气体和空气在中央和地面之间的分流的影响。燃烧器出口处的环形管道。可以得出的主要结果是，与通常的圆盘稳定的非预混合燃烧器概念相比，所研究的燃烧器配置具有出色的稳定性。在设计和运行参数方面的稳定性极限可以根据流动和混合模式来解释，其特征是在燃烧器附近的场中出现了双环形涡旋结构。通过对火焰内部的速度（LDV）以及温度/气体采样进行了详细的测量。这些测试的结果是在200 kW的热功率范围内进行的，也将用于建立和验证最大7000 kW以下大型燃烧器的放大设计规则，这是由MECBURN项目中的工业合作伙伴组织进行的实验研究。

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