Reboiler dead zone

Areas that are not involved in heat exchange are considered dead zones, but such areas should be ignored. What is commonly referred to as a “reboiler” is actually a “heat exchanger”; it simply has a different name based on its function within the system. Those with low pressure, a large heat exchange area, and relatively few dead zones, such as plate heat exchangers. In shell-and-tube and coiled-tube heat exchangers, the heat exchange area is relatively smaller than that of plate heat exchangers, and the \"dead zone\" is larger; this only affects efficiency. Its working principle is that the heated liquid turns into gas and rises, while the liquid with a relatively lower temperature flows downward and remains in the lower layer continuously (convection principle). As the liquid absorbs heat and evaporates, this leads to a circulation of the liquid throughout the entire volume. For reference.