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T e l：+86-0531-85667509
F a x：86-0531-85667508
E-mai：warwickpump@gmail.com
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Heat Transfer Issues of the molten salt pump
release time：2016/10/29 clicks：
A high-temperature molten salt flow loop and its main components are pictured and labeled. The direction of the flow is clockwise from the reservoir tanks, to the pump, through the thermal flow meter, followed by the heat transfer test section, and finally returning to the reservoir tanks. The flow loop is constructed with 316 SS tubing (1-in. OD, 0.12-in. wall), uses type K thermocouples, and is insulated with Kaowool and Pyrogel XT. The main components of the molten salt loop are the reservoir tanks, a centrifugal impeller high temperature liquid salt pump, a high temperature thermal mass flow meter, an up-flow heat transfer test section, and a laser-based manometer. Each of the components had to be carefully designed with respect to the operating conditions that it would see during loop operation. The minimum requirement was that the different components needed to operate above the melting point of the liquid salts of interest (454°C for FLiNaK and 426°C for KCl-MgCl2). To provide a significant margin, the base design was selected to ensure that all of the components could operate at temperatures of 600°C or greater. The maximum flow rate in the loop is limited by the available power input and removal, approximately 4 kW.
There are currently two heat transfer test sections, a ½-in. OD (0.37-in. ID) and a ¼-in. OD (0.085-in. ID), which have been used in the loop. Figure 7 is a schematic of the test sections. Both test sections are single-channel cylindrical tubes that have abrupt constrictions and expansions from the 1-in. tube to the ½ or ¼-in. tube. The smaller diameter portion of each test section is wrapped with a NiCr 60 heating wire (red section of schematic) and has five thermocouples welded to the wall (TSH1 through 5), equally spaced every six in. over the total 24 in. length. The inlet (TSHIN) and outlet (TSHOUT) center-line temperatures for the test sections are measured with ¼-in. diameter thermocouples. 
