分体管壳式余热锅炉内摩擦及局部压降

发布时间：2018-01-06 06:25

本文关键词：分体管壳式余热锅炉内摩擦及局部压降　出处：《化工学报》2016年10期 　论文类型：期刊论文

【摘要】：通过搭建可视化分体管壳式余热锅炉实验平台,对其下部管壳内汽液两相横向冲刷水平管束时摩擦及局部压降的计算进行了研究。在测量竖直上升管内截面含汽率时,将粒子图像测速(PIV)技术与传统压差法相结合,针对上升管中出现的泡状流型,给出了计算截面含汽率的新方法;在竖直上升管内定义了一种泡状-段塞流的新流型,并分析得出将质量含汽率x=10?4作为区分泡状流与泡状-段塞流的边界。根据汽液两相横向冲刷管束时摩擦压降与局部压降类似的产生规律,将两者作为整体分析,通过借鉴Chisholm计算方法对实验数据进行处理,重点对汽液两相横向冲刷管束时摩擦及局部压降的计算进行研究,得到了可用于计算摩擦及局部压降的关联式。对所得实验数据验证计算后发现,误差在±20%以内,能够较好地满足工程计算需要。
[Abstract]:By building the visualization experiment platform of shell tube type waste heat boiler, the calculation of friction and local pressure drop at the lower part of the vapor-liquid two-phase flowing over horizontal tube bundle in the shell were studied. The rising tube void fraction in vertical measurement, particle image velocimetry (PIV) technology and the combination of traditional differential pressure method the bubbly flow, the ascending pipe, presents a new method to calculate void fraction; a bubble slug flow of the new type defined in the vertical pipe, and analyzed the steam rate of x=10 containing quality? 4 as the distinction between bubble flow and bubble slug flow according to the boundary. The vapor-liquid two-phase horizontal tube bundles when friction pressure drop of similar local pressure drop, both as a whole analysis method of experimental data were processed by using Chisholm calculation, focus on the friction of vapor-liquid two-phase transverse tube bundles and local pressure drop The relationship between friction and local pressure drop is obtained. The experimental data verify that the error is within or below 20%, which can meet the needs of engineering calculation.

【作者单位】：西安交通大学热流科学与工程教育部重点实验室;北京航天石化技术装备工程有限公司;
【分类号】：TK16
【正文快照】： 2北京航天石化技术装备工程有限公司,北京100166)引言我国余热资源开发利用潜力巨大,管壳式余热锅炉因其结构优势成为石油、化工领域重要的余热利用装备[1]。为高效利用工业中普遍出现的大流量高温烟气,管壳式余热锅炉逐渐从单管壳结构发展成为以上升管和下降管连接的分体管壳

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