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化工学报  2014 

垂直上升内螺纹管内流动沸腾传热特性

DOI: 10.3969/j.issn.0438-1157.2014.03.017, PP. 884-889

Keywords: 内螺纹管,上升管,两相流,传热

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Abstract:

在压力9~22MPa,质量流速450~2000kg·m-2·s-1,内壁热负荷200~700kW·m-2的参数范围内,试验研究了用于1000MW超超临界锅炉φ28.6mm×5.8mm垂直上升内螺纹水冷壁管内汽水流动沸腾传热。研究表明:内螺纹管内壁螺纹的漩流作用可抑制偏离核态沸腾(DNB)传热恶化,内螺纹管在高干度区发生蒸干型(DO)传热恶化。增大质量流速可推迟壁温飞升,壁温飞升幅度随质量流速增大而降低。热负荷越大管壁温越高,随热负荷增大管壁壁温飞升提前,且传热恶化后壁温飞升值增大。随着压力增加,壁温飞升发生干度值减小。内螺纹管汽水流动沸腾传热系数呈π形分布,传热系数峰值出现在汽水沸腾区。文中还给出了亚临界压力区内螺纹管单相区和汽水沸腾区的传热系数试验关联式。

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