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在试验台上对外径38.1 mm,壁厚7.2 mm,倾斜角度26.21°的光管进行了水动力及传热特性试验研究,以确定是否会发生壁温飞升、传热恶化及汽水分层等现象,并对该类型螺旋管圈水冷壁在实炉运行工况下进行了试验研究,以验证在试验台上得到的试验结果.结果表明:在启动过程以及低负荷工况,倾斜光管壁温正常,未超过金属的许用温度;但是在拟临界点附近,管壁对工质的对流传热系数减小,发生传热恶化现象;如果管壁热负荷较高,管壁温度将发生飞升,可能会引起爆管.
On the test bench, hydrodynamic and heat transfer characteristics tests were carried out on a light pipe with an outer diameter of 38.1 mm, a wall thickness of 7.2 mm and an inclination angle of 26.21 ° to determine whether the phenomenon of wall temperature soaring, deterioration of heat transfer and stratification of steam and water would occur , And the type of helical coil water wall in the real furnace operating conditions were tested to verify the test results obtained in the test stand.The results show that: in the start-up process and low load conditions, incline wall temperature Normal, not exceeding the allowable temperature of the metal; but in the vicinity of the pseudo-critical point, the convective heat transfer coefficient of the pipe wall on the working fluid decreases, heat transfer deterioration occurs; if the pipe wall heat load is high, the pipe wall temperature will rise , May cause a squib.