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水平布置的同轴双层热气导管在１０ＭＷ高温气冷实验反应堆中是连接堆芯和蒸汽发生器的重要部件，管内外分别流过高温和低温氦气。在氦气工程试验回路上进行了热气导管热工性能试验，使用氦气介质，在３．０ＭＰａ，９５０℃温度下连续热运行时间超过９８ｈ，在３．０ＭＰａ，７００℃以上温度条件下的热运行时间超过３５０ｈ。还在０．１～３．４ＭＰａ压力范围内进行了２０次压力循环；在１００～９５０℃范围内，进行了１８次温度循环试验。热气导管内绝热层的有效导热系数λｅｆ＝０．３５１２＋０．０００３ＴＷ／（ｍ·℃），在ＨＴＲ１０额定运行工况下的λｅｆ＝０．４７Ｗ／（ｍ·℃）。试验结果表明，热气导管具有所要求的热绝缘性能和承受热循环、压力循环的能力
The horizontally arranged coaxial double-layer hot gas duct is an important part connecting the core and the steam generator in the 10MW high temperature gas-cooled experimental reactor. The high and low temperature helium flows inside and outside the pipe respectively. In the helium engineering test circuit, the thermal performance test of the hot gas conduit was carried out. The thermal run time of the hot gas conduit was more than 98 h at 3.0 MPa and 950 ° C using the helium medium. At 3.0 MPa and over 700 ° C, Running time more than 350h. In the pressure range of 0.1 ~ 3.4MPa, 20 pressure cycles were carried out. In the temperature range of 100 ~ 950 ℃, 18 temperature cycles were carried out. The effective thermal conductivity λef = 0.3512 + 0.0003TW / (m · ℃) of thermal insulation layer in the hot gas duct, λef = 0.47W / (m · ℃) under the rated operating condition of HTR10. The test results show that the hot gas duct has the required thermal insulation properties and ability to withstand thermal cycling and pressure cycling