评估板式热交换器中的瞬态热应力

IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Pressure Vessels and Piping Pub Date : 2024-08-22 DOI:10.1016/j.ijpvp.2024.105296
G.S.M. Martins, T.S. Possamai, K.V. de Paiva, J.L.G. Oliveira
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引用次数: 0

摘要

通过实验评估了板式热交换器(GPHE)中不锈钢 316 L 板的热应力和机械应力。应力是借助关键板区域的拉伸计间接测定的。据我们所知,此前还没有关于 GPHE 板瞬态热负荷的实验分析报告。在应变片的帮助下,我们进行了突然加热和逐渐加热过程的实验。前者意味着热流体以最终目标温度进入 GPHE 支路,而后者则表示热流体逐渐被加热到目标温度。此外,在单工况和双工况下,还对相内和相外负载产生的机械和热应力进行了评估。实验采用了两种板厚(0.5 毫米和 0.7 毫米)。实验得出的应力与包含简化几何形状和边界条件的模型得出的应力进行了比较。在单一结构中,GPHE 支管之间的压差所产生的机械应力主要影响分布区。舷窗处的热应力高于分布区的热应力,特别是对于较厚的板材。此外,双重运行时的热应力也有所增加。系统静止时的突然加热过程会在几秒钟内产生热峰值应力,而逐渐加热热流体达到峰值应力的时间为几分钟。在给定的设置下,舷窗处在同相负载和双重运行的情况下会达到最临界状态。
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Assessment of transient thermal stresses in gasketed plate heat exchangers

Thermal and mechanical stresses in stainless steel 316 L plates of gasketed plate heat exchangers (GPHEs) have been assessed with the aid of experiments. Stresses were indirectly determined with the aid of extensometers in critical plate areas. To the best of our knowledge, no experimental analysis of transient thermal loads on GPHE plates has been reported before. Experiments occurred with sudden and gradual heating processes with the aid of strain gauges. The former process implies that hot fluid enters the GPHE branch with the final target temperature, while the latter indicates that the hot fluid is progressively heated to the target temperature. Furthermore, combined mechanical and thermal stresses resulting from in-phase and out-of-phase loads are assessed in single and double operating conditions. Experiments were carried out with two plate thicknesses (0.5 and 0.7 mm). Stresses as obtained from experiments were compared to those provided by models containing simplified geometries and boundary conditions. Mechanical stresses promoted by the pressure difference between GPHE branches mostly affected the distribution area in single configuration. Thermal stresses at the porthole were higher than the ones found at the distribution zones, particularly for thicker plates. Besides, thermal stresses increased in double operation. Sudden heating processes with the system at rest promoted thermal peaking stress in a timescale of seconds, while the timescale to reach peak values by gradually heating the hot fluid is in the order of minutes. The most critical condition would be achieved at the porthole with in-phase loads and in double operation for the given settings.

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来源期刊
CiteScore
5.30
自引率
13.30%
发文量
208
审稿时长
17 months
期刊介绍: Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.
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