不锈钢精馏装置内回流和外回流的应用


Release time:

2023-01-07

1.外回流对工艺流量及温度控制有利,不但操作费用高,而且没有利用液体的势能,所以成本高。如果塔顶冷凝器达不到冷凝要求时,可以增设强制的冷凝回流系统,从而实现不锈钢精馏装置的强化操作。另外投资时还要比较操作费用和基础设施的投资费用的相对大小。

1.外回流对工艺流量及温度控制有利,不但操作费用高,而且没有利用液体的势能,所以成本高。如果塔顶冷凝器达不到冷凝要求时,可以增设强制的冷凝回流系统,从而实现不锈钢精馏装置的强化操作。另外投资时还要比较操作费用和基础设施的投资费用的相对大小。

2.如果回流液的计量要求不高,或者说回流比的操作弹性大,就可以采用内回流;

3.如果能在内回流的路线上装上或开发出“在线流量测量仪器”,就可以内回流。一般的精馏多为外回流!

外回流优点是便于调节,但要增加运行费用,且增加了泄漏点,对于一此高危介质不一定适宜,所以对于塔不是太高的高危介质优先考虑内回流,如氟化氢精馏就是选用内回流的。所以,对于回流方式的选择要从多个方面综合考虑的。

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