Study on Flow Distribution and Resistance Characteristics of Secondary Side of Intermediate Heat Exchanger

Intermediate heat exchanger is an important equipment for heat exchange between liquid-sodium cooled fast reactor core and steam generator. Due to the large number of tube bundles, it is difficult to get accurate flow distribution and resistance characteristic parameters by theoretical calculation. In order to solve the above problems, an intermediate heat exchanger was taken as a prototype, and the flow distribution and resistance characteristics tests were carried out on a 1∶1 model. The flow distribution factors of different flow distribution structures and the resistance coefficients of local structures such as the central descending section of the secondary side and the heat exchange tube section were obtained. The results show that the conical plate and no flow-distribution structure will lead to the high outer flow. The orifice plate structure can reduce the outer flow distribution factor and make the flow distribution more uniform. The resistance coefficients of the central descending section and the heat exchange tube section of the secondary side decrease slightly with the increase of Reynolds number (Re). The resistance coefficient of the secondary side lower head from large to small is conical plate, orifice plate 2, orifice plate 1, no flow distribution structure, and the change of the total resistance coefficient also follows this law. The research results can provide data support for the optimization design of intermediate heat exchanger.