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在自然循环工况下蒸汽发生器一次侧入口流量为0.4~0.7 kg/s的参数范围内,开展了蒸汽发生器U型传热管倒流特性实验。针对9种不同长度的U型传热管,分别设置9个倒流监测点,获得了倒流在不同长度U型管中的分布特性。基于传热管压降实测数据和守恒原理,获得了蒸汽发生器一次侧的倒流总流量以及倒流U型管的数目。结果表明,在本实验参数范围内,约有61%的U型管发生倒流,使传热管正向流通面积减小为原来的39%。倒流同时导致正流流量增加60%,与不发生倒流的情况相比,U型管平均流速增大4.2倍。 相似文献
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Problem of the iodine method of purification of zirconium 总被引:1,自引:0,他引:1
A method is proposed for the determination of the equilibrium constantsk and k' for the reactions Zr+2I2–ZrI4=0 and 2I–I2=0, which is based on the measurement of the amount of iodine or zirconium liberated in the decomposition of zirconium tetraiodide on a heated surface in the process of establishing equilibrium. The decomposition of the tetraiodide was carried out at 900–1600C on a tungsten filament. The temperature distribution between filament and vessel walls was neglected.The dependence of the sum of atomic and molecular iodine pressures
on zirconium tetraiodide pressure
was determined at 1430C, and on temperature for
50 mm Hg. The values of kk'2 35 (mm Hg)3 at 1430C and k0.07 mm Hg at 400C, found from the results, differ substantially from known thermodynamic data, but give good agreement between the authors' formula [1] and experimental results on the iodide process of zirconium purification. 相似文献
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