Dry distillation and wet distillation
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Who can accurately explain dry distillation and wet distillation? What is the difference between them? Thank you
In the dry process, no steam is used; fractionation is achieved by reducing pressure. The separation accuracy is not high, and this method is mainly used to produce fuel-grade materials； The wet process requires the injection of steam for stripping; steam is also injected into the furnace tubes. By injecting steam, the partial pressure of oil and gas is reduced, thereby improving the separation accuracy. This approach yields higher separation precision and a higher recovery rate, but it also results in higher energy consumption.
What do the phrases \"Wet process requires steam injection for stripping, as well as steam injection into the furnace tubes\" mean? Thank you!
Superheated steam is injected above the feed distributor at the bottom of the tower to reduce the vapor pressure of oil and gas； Steam is also injected into the pipes before feed enters the heating furnace; the steam, along with the oil, enters the furnace to be heated, which helps reduce the vapor pressure of the oil and gas and prevents coking.
In wet distillation, there are furnace tubes and steam injection at the bottom of the vacuum tower, while dry distillation does not have these