含氧杂质对普通换热方式及铅冻结条件下蒸汽发生管横向换热的影响

V. Grabezhnaya, A. Mikheyev, A. Kryukov
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引用次数: 0

摘要

NIKIET正在开发的BREST-OD-300蒸汽发生器项目在使用的热载体(铅)和设计实施(螺旋传热管线圈)方面都处于领先地位。螺旋盘管式蒸汽发生器设计与直管式蒸汽发生器设计相比,优点是明显的。螺旋盘管用于换热设备,不仅可以增加传热面,解决热膨胀问题,还可以增加管内流动流体的传热系数。2011-2017年,在IPPE SPRUT设施(IPPE)进行了各种型号铅加热蒸汽发生器的热水力试验。该试验方案旨在研究蒸汽发生管的传热特性和热液稳定性。在整个操作参数变化的范围内,没有检测到水循环的脉动模式。在标称运行中得到了过热蒸汽的设计温度。结果提供了各种运行条件下(标称和部分模式,启动模式)蒸汽发生通道不同区域的水传热的广泛信息。然而,为了验证计算机代码,需要在换热管束周围进行铅冷却剂传热的实验数据。在全尺寸蒸汽发生器中,由于管内扭角较小,可以说横向流动时的换热接近于换热。建立了含铅冷却剂在蒸汽发生管周围横向流动的模型。该研究的主要目的是获得在正常传热模式和铅冻结情况下铅中氧浓度对传热的影响数据。在铅和水的初始温度值变化的整个范围内,没有记录冷冻铅堵塞环形空间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ON THE EFFECT OF OXYGEN IMPURITIES ON HEAT TRANSFER AT TRANSVERSAL FLOW OF STEAM-GENERATING TUBES IN NORMAL HEAT TRANSFER MODES AND WITH LEAD FREEZE
The BREST-OD-300 steam generator project being developed at NIKIET is pioneering both in terms of the heat carrier used (lead) and in design implementation (coils of helical heat transfer tubes). The advantages of the designs of steam generators made in the form of helical coiled tubes, in comparison with straight tube designs are obvious. Helical coiled tubes are used in heat exchange equipment not only to increase the heat transfer surface, to solve the problem of thermal expansion, but also to increase the coefficient of heat transfer to the fluid flowing inside the tubes. In 2011-2017 years the thermohydraulic tests of various models of lead-heated steam generator were carried out at the IPPE SPRUT facility (IPPE). The test program was aimed to study the heat transfer and the thermal-hydraulic stability of the steam generating tubes. Throughout the entire range of changes in operating parameters, no pulsating modes were detected with overturn of circulation in the water circuit. The design temperatures of superheated steam were obtained in nominal operation. The results provide extensive information on water heat transfer in different zones of the steam generating channel under various operating conditions (nominal and partial modes, starting modes). However, to verify the computer codes, experimental data on the heat transfer of lead coolant around the bundles of heat transfer tubes are necessary. Due to the small twist angle of the tubes in a full-scale steam generator, it can be said that heat transfer is close to heat transfer during transverse flow. A model with a transverse flow of lead coolant around steam-generating tubes was developed at the SSC RF - IPPE. The main goal of the research was to obtain data on the effect of oxygen concentration in lead on heat transfer in normal heat transfer modes and with lead freezing. Throughout the entire range of changes in the initial temperature values of lead and water, blocking of the annular space by frozen lead was not recorded.
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