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["[Каждый день задача №139]с 218-5-19"

2018-05-19View Original

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["Это последнее редактирование пользователем Лилотея 7228-5--11111111 111:53 [Каждый день задача №131]с
Reply #22018-05-19
错,液泛是指在塔中进行气液逆流接触过程或液液逆流接触过程,由于流速过大而不能实现逆流操作的状态。在气液接触的塔中达到泛点时,液体不能顺畅地下流而向上漫延,并被气体大量带出。产生液泛的原因是:塔板上汽相负荷过大。实质上是上一块塔板的液体经过降液管与塔板的间隙来不及流下去,这样,该层塔板上斯渐积满了液体,后来,上一层塔板也积满液体,这时,液泛便会发生。发生液泛后,塔板下部压力越来越大,流体更难往下流,如果减少加热量,塔底又会出现满液位。 防止产生液泛的措施是: (1)按规定的进料量操作; (2)按规定的回流量操作。
Reply #32018-05-19
错 在精馏塔中,由于各种原因造成液相堆积超过其所处空间范围,称为液泛;在精馏过程中,自某块塔板往上液体逐渐积累,以至充满部分塔段,使上升气体受阻,使气、液两相的传质传热过程不能正常进行,这就叫淹塔。

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