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本文针对目前大型合成氨设备等内氨汽提塔汽提管上端存在局部超常腐蚀减薄等问题,以空气-水为介质,对实际应用结构条件及参数下汽提管内下降液膜的液泛、倒流及挂膜特性进行模拟实验研究,观察和测量了径、切向进液方式下的液泛、倒流和挂膜工况,研究了管长、汽提管上出口节流度和进液中夹气率等因素对液泛气速和挂膜长度的影响,结果表明:使用切向进液方式取代现用的径向进液、增加汽提管上出口节流度、适当选择进液中夹气率等可显著改善管内降膜的稳定性,这对解决汽提管上端局部超常腐蚀减薄和强化管内降膜传热等都具有重要价值。
In this paper, the current large scale ammonia plant and other internal ammonia stripper top there is super-local corrosion thinning and other issues to air - water as a medium, the actual application of structural conditions and parameters within the stripping pipe within the drop liquid pan, Backflow and film-forming characteristics of simulation experiments were observed and measured under the radial and tangential liquid inlet pan, back and hanging film conditions, the study of the tube length, the stripping pipe on the outlet flow and into the liquid Gas pressure and other factors on the liquid velocity and the length of the hanging film, the results show that: the use of tangential into the liquid instead of the existing radial into the liquid to increase the export of the stripping tube throttling degree, the appropriate choice into the liquid Such as the gas rate can significantly improve the stability of the falling film tube, which is of great value to solve the top of the stripping pipe locally super-eutectic thinning and strengthen the tube falling film heat transfer and so on.