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Development of combined low-emissions burner devices for low-power boilers

机译：开发用于低功率锅炉的组合式低排放燃烧器装置

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Low-power water boilers are widely used for autonomous heat supply in various industries. Firetube and water-tube boilers of domestic and foreign manufacturers are widely represented on the Russian market. However, even Russian boilers are supplied with licensed foreign burner devices, which reduce their competitiveness and complicate operating conditions. A task of developing efficient domestic low-emissions burner devices for low-power boilers is quite acute. A characteristic property of ignition and fuel combustion in such boilers is their flowing in constrained conditions due to small dimensions of combustion chambers and flame tubes. These processes differ significantly from those in open combustion chambers of high-duty power boilers, and they have not been sufficiently studied yet. The goals of this paper are studying the processes of ignition and combustion of gaseous and liquid fuels, heat and mass transfer and NO_x emissions in constrained conditions, and the development of a modern combined low-emissions 2.2 MW burner device that provides efficient fuel combustion. A burner device computer model is developed and numerical studies of its operation on different types of fuel in a working load range from 40 to 100% of the nominal are carried out. The main features of ignition and combustion of gaseous and liquid fuels in constrained conditions of the flame tube at nominal and decreased loads are determined, which differ fundamentally from the similar processes in steam boiler furnaces. The influence of the burner devices design and operating conditions on the fuel underburning and NO_x formation is determined. Based on the results of the design studies, a design of the new combined low-emissions burner device is proposed, which has several advantages over the prototype.
机译：小功率热水器被广泛用于各个行业的自主供热。国内外制造商的火管和水管锅炉在俄罗斯市场上有广泛的代表。但是，即使是俄罗斯锅炉，也配备有许可的国外燃烧器设备，这会降低其竞争力并使操作条件复杂化。开发用于低功率锅炉的高效家用低排放燃烧器装置的任务非常紧迫。在这种锅炉中，点火和燃料燃烧的特征是由于燃烧室和火焰管的尺寸小，它们在受限的条件下流动。这些过程与高功率锅炉的开放式燃烧​​室中的过程明显不同，并且尚未对其进行充分的研究。本文的目的是研究在受限条件下的气态和液态燃料的点火和燃烧过程，传热和传质以及NO_x排放，以及现代组合低排放2.2 MW燃烧器装置的开发，该装置可提供有效的燃料燃烧。开发了燃烧器设备计算机模型，并对在额定载荷的40％至100％范围内的不同类型燃料的运行进行了数值研究。确定了在标称载荷和减小载荷下在火焰管的约束条件下气态和液态燃料着火和燃烧的主要特征，这些特征与蒸汽锅炉炉中的类似过程根本不同。确定了燃烧器设备设计和运行条件对燃料欠燃和NO_x形成的影响。根据设计研究的结果，提出了一种新的组合式低排放燃烧器装置的设计，该装置比原型具有多个优点。

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