通过改变TPP 312锅炉旋流燃烧器内一次气流来减缓氮氧化物的产生

S. Kobzar, G. Kovalenko, A. Khalatov
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摘要

利用计算机模拟了TPP 312锅炉燃烧器内一次风的旋流作用下炉膛内氮氧化物的形成过程。涡流的组织允许减少氮氧化物的产生,因为回流的形成,氧化产物压载燃烧区。这种技术的局限性在于燃烧温度的降低会导致燃烧不足。本研究的目的是通过对TPP 312 DTEK Ladyzhyn TES锅炉燃烧空间气体动力学的计算机模拟,确定在燃烧器通道中使用旋转气流时氮氧化物的形成。燃料,特别是固体燃料的有效燃烧是由三个因素保证的:燃料和氧化剂的混合,在燃料颗粒燃烧所需的温度区域内停留的时间和温度。参数的选择受到来自相反方向的要求的压力。一方面,较高的温度有助于更好的燃料燃烧,但另一方面,氮氧化物的形成在较高的温度下增加。对进站煤的质量数据进行分析,可以得出煤的平均特性,用于改进软件包的燃烧模型。在有旋流存在的情况下,燃烧器的最高温度比直流式燃烧器低108 K,使氮氧化物的生成减少5%。离心流动在燃烧器轴上产生了一个稀薄区,反应产物开始加热燃烧器本身的燃料混合物。在施加扭转过程中,燃烧开始的表面积减少了30%。研究结果表明,一次空气的扭转不会导致氮氧化物的显著减少。
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SLOW-UP GENERATION OF NITROGEN OXIDES BY TURNING THE PRIMARY AIR FLOW IN THE SWIRL BURNER OF THE BOILER TPP 312
The aim of the work is computer simulation of the formation of nitrogen oxides in the furnace of the boiler TPP 312 with the swirl of the primary air in the boiler burners. The organization of the vortex flow allows reducing the generation of nitrogen oxides due to the formation of a return flow, which ballasts the combustion zone by oxidation products. The limitation of this technique is the reduction of the combustion temperature which can lead to underburning. The objective of the study is to determine the formation of nitrogen oxides based on computer simulation of the gas dynamics of the firing space of the boiler TPP 312 DTEK Ladyzhyn TES when swirling streams of air are used in the burner channels. Efficient combustion of fuel, in particular solid, is ensured by three factors: mixing of the fuel and the oxidizing agent, residence time in the temperature zone necessary for the combustion of fuel particles and temperature. The selection of the parameter is under pressure from requirements operating in opposite directions. On the one hand, a higher temperature contributes to better fuel burning, but, on the other hand, the formation of nitrogen oxides increases at a higher temperature. Analysis of the data on the quality of coal that comes to the station made it possible to derive the averaged characteristics of coal that were used to improve the combustion model of the software package. Conclusions In the presence of swirling flow, the maximum temperature is 108 K lower than in the case of a direct-flow burner, which causes a 5% reduction in the generation of nitrogen oxides. Centrifugal flows created a rarefaction zone at the burner axis and the reaction products begin to heat the fuel mixture in the burner itself. The surface area of ​​the beginning of combustion during the application of twisting reduces by 30%. The results of the study showed that the twisting of the primary air does not lead to a significant reduction of nitrogen oxides.
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