AbstractThis paper presents the results of studies on the combustion of gaseous LPG in a bubbling fluidized bed. Relationships between the temperature, the bed mass and the location of the combustion zone and the NOx and CO concentrations in exhaust gases are described. The concentrations of both gases increase with rising temperature and then quickly decline. It has been shown that despite the increase in average bed temperature the drop in the emission of nitrogen oxides is connected with lower temperatures inside the exploding bubbles. These temperatures strongly depend on the quantity of solid contained in them. The paper also presents the results of modeling the combustion process in a fuel-air bubble. The modeling carried out has shown that above the temperature at which bubble self-ignition becomes possible inside the bed, with further bed temperature rise there is an increase in the solids content inside the bubbles at the moment of explosion. As a result, the maximum temperature inside the bubbles falls and the emission of nitrogen oxides is reduced. In turn, the emission of CO is linked to the propagation of combustion between bubbles when self-ignition cannot take place inside them. Graphical AbstractComparison of experimental and calculated NOx concentration, as a function of the fluidised bed temperatureHighlights1.A gaseous fuel burns in a bubbling fluidized bed2.The combustion is intermittent and takes place inside bubbles, the combustion process starts in the toroidal part of the bubble3.The NO concentration is linked to the bubble temperature, not to the bed temperature4.The solids inside a bubble affect its thermal capacity5.Consequently NO concentration falls with rising bed temperature

中文翻译：

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气泡中固体颗粒含量可变的鼓泡 FBC 中的预混 LPG + 空气燃烧

摘要本文介绍了气态液化石油气在鼓泡流化床中燃烧的研究结果。描述了温度、床质量和燃烧区位置与废气中 NOx 和 CO 浓度之间的关系。两种气体的浓度都随着温度的升高而增加，然后迅速下降。已经表明，尽管平均床温升高，氮氧化物排放量的下降与爆炸气泡内部的温度降低有关。这些温度很大程度上取决于其中所含固体的数量。该论文还介绍了对燃料-空气泡中的燃烧过程进行建模的结果。进行的建模表明，在床内气泡可能自燃的温度以上，随着床温进一步升高，爆炸时气泡内的固体含量会增加。结果，气泡内的最高温度下降，氮氧化物的排放量减少。反过来，当气泡内部无法自燃时，二氧化碳的排放与气泡之间的燃烧传播有关。图形摘要作为流化床温度函数的实验和计算出的 NOx 浓度的比较 亮点 1. 气体燃料在鼓泡流化床中燃烧 2. 燃烧是间歇性的，发生在气泡内，燃烧过程从气泡的环形部分开始 3。 NO 浓度与气泡温度有关，与床温无关4。气泡内的固体会影响其热容量 5。