A reboiler (also called a reboiler), as the name suggests, vaporizes a liquid again. Its structure is similar to the condenser, but one is used to cool down, and the reboiler is used to heat up and vaporize.
The reboiler is often used in combination with the fractionation column: the reboiler is a special heat exchanger that can exchange heat and has a vaporization space. The feed level in the reboiler and the fractionation column level are at the same level. The liquid phase is supplied from the bottom line into the reboiler. Typically 25-30% of the liquid phase is vaporized in the reboiler.
The vaporized two-phase stream is sent back to the fractionation column, and the gas-phase components returning to the column pass upward through the trays, while the liquid-phase components fall back to the bottom of the column.
The material in the reboiler is heated to expand or even vaporize, and the density becomes smaller, so it leaves the vaporization space and returns to the tower smoothly, returning to the gas-liquid two-phase in the tower. Due to the static pressure difference, the bottom of the tower will continuously replenish the liquid level that has been evaporated.
