旋流射流在低品位燃料低排放燃烧中的数学建模

Usama J. Mizher, P. A. Velmisov
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引用次数: 0

摘要

摘要在能源领域寻找新的解决方案,防止对环境的负面影响,是现代社会的优先任务之一。天然气在俄罗斯UES对化石燃料的需求中占有稳定的地位。沼气是从有机废物中提取的一种可能的替代燃料。沼气的二氧化碳含量增加,影响火焰传播的速度,甲烷含量较低,降低了其燃烧热。而天然气与沼气复合燃烧,在燃料与氧化剂混合良好的情况下,一方面可以降低电厂动力锅炉燃烧室的最高绝热温度,另一方面可以增加沼气燃烧的稳定性。为了在运行的动力锅炉中实现天然气与沼气的联合燃烧,有必要对现有的燃烧器进行改造。为了高质量地重建能够提供稳定和低毒燃料燃烧的燃烧器,重要的是要有关于有机燃料组合燃烧对燃烧区温度分布及其最大值的燃烧影响的理论数据。本文给出了粘性不可压缩介质模型中液(气)轴对称运动能量方程的自相似解。在此基础上,构造了旋流射流中的稳态温度场。基于ANSYS Fluent软件求解器,开发了一套用于燃烧室热动力学和气体动力学过程建模和研究的程序。在k -可实现湍流模型的基础上,模拟了旋转燃料-空气混合物的燃烧过程。本文给出了射流中温度和二氧化碳分布的解析和数值研究结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mathematical modeling of a swirling jet in applications to low-emission combustion of low-grade fuels
Abstract. The search for new solutions in the field of energy, preventing negative impact on the environment, is one of the priority tasks for modern society. Natural gas occupies a stable position in the demand of the UES of Russia for fossil fuel. Biogas is a possible alternative fuel from organic waste. Biogas has an increased content of carbon dioxide, which affects the speed of flame propagation, and a lower content of methane, which reduces its heat of combustion. However, the combined combustion of natural gas and biogas, provided that the mixture of fuel and oxidizer is well mixed, can, on the one hand, reduce the maximum adiabatic temperature in the combustion chamber of power boilers at TPPs, and, on the other, increase the stability of biogas combustion. For the combined combustion of natural gas and biogas in operating power boilers, it is necessary to reconstruct the existing burners. For a high-quality reconstruction of burners capable of providing stable and low-toxic combustion of fuel, it is important to have theoretical data on the combustion effect of combustion of combinations of organic fuels on the temperature distribution in the combustion zone and on its maximum value. In this paper, self-similar solutions of the energy equation for axisymmetric motion of a liquid (gas) in a model of a viscous incompressible medium are obtained. Basing on them, a stationary temperature field in swirling jets is constructed. A set of programs based on the ANSYS Fluent software solver has been developed for modeling and researching of thermal and gas-dynamic processes in the combustion chamber. On the basis of the k - ϵ (realizable) turbulence model, the combustion process of a swirling fuel-air mixture is simulated. The results of an analytical and numerical study of the temperature and carbon dioxide distribution in the jet are presented.
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