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The reasons and consequences of "dry plates" in the trays and packing in the upper gasification section of the dry pressure reducing tower: When there is no internal reflux in the upper tray or packing of the feed gasification section of the vacuum tower, it is called a dry plate (it is also called a dry plate when the internal reflux oil on the upper packing of the gasification section of the dry vacuum tower is insufficient). The upper part of the gasification section of the vacuum tower is usually operated at the highest temperature of the tower. If it is operated under a dry plate for a long time, it will cause coking of the trays or packings, causing the pressure drop of the trays or packings to increase. In severe cases, the tower cannot operate. The main cause of dry plate is that there is no internal reflux oil on the tray or packing, or the reflux oil of the packing is too light and the flow rate is too low. However, the extraction rate of the vacuum tower is too high, and the low vaporization rate of the vacuum tower can also cause coking of the dry plate. The use of full distillation in the last side line can also cause dry plate. The dry pressure reducing plate tower must ensure sufficient reflux and internal reflux oil. The packed tower must be installed to ensure the spray density and the distillation volume of a side oil in the vaporization section to avoid coking in the vaporization section and ensure product quality.