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| 1 | 管束布置对凝汽器性能影响的■分析及其应用显示文摘凝汽器是发电厂的重要辅机设备,其流动与传热性能的优劣对单位发电量的能耗影响很大,为了适应我国节能减排的重大需求,优化和改进大型凝汽器的设计是十分必要的.目前凝汽器的管束布置大多基于工程经验的总结,缺乏理论分析,难以进行凝汽器管束布置的优化设计.本文介绍了动量■和质量■的概念,建立了凝汽器壳侧蒸汽流动的动量■耗散和质量■增与流动与传热分布参数之间的关系,针对4种管束布置的330 MW凝汽器,采用数值方法分析了管束布置对凝汽器壳侧压降和抽气量的影响,总结出了凝汽器管束布置的设计原则与要点.在此基础上,详细介绍了基于理论和数值分析结果所发明的仿生双连树型管束布置凝汽器的性能及其应用. | 孟继安 李志信 | 2016 | 科学通报2016，61，17： | 13 |
| 2 | 基于(火积)理论的火力发电节能优化研究显示文摘提高能源利用效能,是控制化石能源总量,进而实现2030年碳达峰、2060年碳中和目标的必要途径.接近我国总装机容量50%的火力发电机组全工况节能降耗在用能能效提升中具有关键作用.新物理量'(火积)'的引入贯通了系统能效与关键设备内部各物理量场、传热传质表面结构参数、运行方式之间的关联,为火力发电系统的全工况节能降耗提供了新视角.本文梳理了(火积)耗散分析方法在火力发电热力系统节能中的应用成果,重点阐述了基于热量(火积)耗散、动量(火积)耗散以及质量(火积)耗散的锅炉尾部烟道及火电机组冷端换热网络的优化方法;并对有待深入解决的问题和未来的研究方向进行展望,分析各关键子系统的节能潜力和优化目标,以期为进一步提升能源转型时期火电机组的节能运行水平提供参考. | 卫慧敏 杨立军 杨勇平 杜小泽 | 2021 | 中国科学:技术科学2021，51，10： | 5 |
| 3 | Analysis of condenser venting rates based on the air mass entransy increases显示文摘Condenser thermal performances, such as the back pressure and venting rate, are strongly affected by the tube arrangement. Condensers have three irreversible processes for the fluid flow, heat transfer and mass diffusion.The condenser venting rate is studied here based on an air mass entransy analysis. The air mass entransy increment rate for the steam and air mixture on the condenser shell side is expressed as a function of the distributed air mass fraction and the steam condensation rate to define the relationship between the condenser venting rate and the flow parameters. Condensers with three typical tube arrangements were analyzed numerically using the porous medium model. The results show that a bigger venting rate always corresponds to a smaller air mass entransy increment rate. The air mass entransy generally decreases in the air concentration region and increases in the air cooling region under the combined action of the air diffusion and steam condensation. The numerical results indicate that the air cooling region of a condenser should be carefully designed and the cooling tubes should be properly arranged to guide the steam flow so as to weaken air concentration,and consequently to decrease the venting rate. | Ji’an Meng Hui Zeng Zhixin Li | 2014 | Chinese Science Bulletin2014，59，26： | 5 |
| 4 | Effect of Cooling Water Flow Path on the Flow and Heat Transfer in a 660 MW Power Plant Condenser显示文摘The effect of the cooling water flow path on the flow and heat transfer in a double tube-pass condenser for a 660 MW power plant unit was numerically investigated based on a porous medium model. The results were used to analyze the streamline, velocity, air mass fraction and heat transfer coefficient distributions. The simulations indicate that the cooling water flow path is important in large condensers. For the original tube arrangement, the heat transfer with the lower-upper cooling water flow path is better than that with the upper-lower cooling water flow path. The reason is that the steam cannot flow into the internal of upper tube bundle and the air fractions are higher in the upper tube bundle with the upper-lower cooling water flow path. An improvement tube arrangement was developed for the upper-lower cooling water flow path which reduced the back pressure by 0.47 kPa compared to the original scheme. Thus, the results show that the tube arrangements should differ for different cooling water flow paths and the condenser heat transfer can be improved for the upper-lower cooling water flow path by modifying the tube arrangement. | ZHONG Dawen MENG Ji'an QIN Peng QIU Xiaolong JIANG Ping LI Zhixin YUAN Fang | 2019 | Journal of Thermal Science2019，28，2： | 3 |
| 5 | 1000MW火电机组凝汽器内乏汽流动与传热特性数值分析显示文摘管束布置对1000MW火电机组大型凝汽器的运行效率有着至关重要的影响,基于分布阻力和分布质量汇的多孔介质模型,对1000MW火电机组改进外围带状管束凝汽器建立了二维数值模型,研究了管束布置对壳侧流场、流速、空气质量分数和传热系数分布的影响,分析了壳侧压降、体积抽气量和不凝结率等参数随背压的变化规律。数值计算结果表明:该管束布置凝汽器空冷区冷却效果较好,但管束模块顶部和中部存在较多的局部涡流,导致传热系数下降,可通过优化设计顶部和中部的辅助进汽通道进一步降低背压,实现各管束模块负荷的均匀性。 | 朱晓磊 钟达文 孟继安 李志信 | 2019 | 汽轮机技术2019，61，6： | 1 |
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