两相均流板对弯管中气固两相运动分布特征的影响

发布时间：2018-01-16 10:42

本文关键词：两相均流板对弯管中气固两相运动分布特征的影响　出处：《环境工程学报》2016年09期 　论文类型：期刊论文

【摘要】：针对燃煤电厂烟气污染物脱除系统设备入口弯管内的气固两相分布不均的问题,提出一种两相均流板,采用CFD数值模拟的方法对比分析了安装两相均流板与常规导流装置的弯道内气流速度分布、颗粒质量浓度分布以及弯管进出口压差变化特征。结果表明:在弯管内安装两相均流板较安装导流板/三角翼挡板更优,既可以使气固两相均匀分布又可以有效降低系统的压阻,克服了常规均流装置气固两相均流效果不佳、阻力大等缺点,在较低的压阻下解决燃煤电厂烟气污染物脱除系统入口气固两相混合不均匀的问题,有效提高污染物脱除效率。
[Abstract]:In order to solve the problem of uneven distribution of gas-solid two-phase in the inlet elbow of flue gas pollutant removal system in coal-fired power plant, a two-phase flow sharing plate is proposed. CFD numerical simulation method is used to compare and analyze the flow velocity distribution in the bend between the two-phase flow sharing plate and the conventional diversion device. The distribution of particle mass concentration and the variation characteristics of pressure difference between the inlet and outlet of the bends. The results show that it is better to install two-phase flow sharing plates in the bends than to install the diversion plates / delta wing baffles. It can not only make the gas-solid two-phase uniform distribution, but also effectively reduce the pressure resistance of the system, and overcome the shortcomings of the conventional gas-solid two-phase flow sharing device, such as poor gas-solid two-phase flow sharing effect and large resistance. Under the condition of low pressure resistance, the problem of non-uniform gas-solid two-phase mixing at the inlet of flue gas pollutant removal system in coal-fired power plant is solved, and the efficiency of pollutant removal is improved effectively.
【作者单位】：山东大学燃煤污染物减排国家工程实验室;
【基金】：国家自然科学基金资金项目(51006063) 山东省自然科学基金资金项目(2014EEM040) 山东大学基本科研业务费专项资金(2014QY001-04)
【分类号】：X773
【正文快照】： 受空间布置的限制,弯管在燃煤电厂烟气污染物脱除系统中被广泛应用,由于受到诸如弯管的弯曲程度、流体的流动马赫数、流体运动方向等众多因素的影响,设备入口弯管内的气固两相流场呈现出十分复杂的流动特性,出现回流、偏流等问题[1-4],在管壁附近形成分离区,管道横截面上产生

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