Abstract: This paper introduces six types of reboiler including kettle reboiler, built-in reboiler, vertical thermosiphon reboiler, horizontal thermosiphon reboiler, forced circulation reboiler and falling film reboiler, analyzes their advantages and disadvantages, and compares their separation performances. In theory, kettle reboiler, built-in reboiler and once-through reboiler have equal separation performance, equivalent to a theoretical plate. The functions of the baffle in tower kettle are to keep the inlet level of reboiler constant for the stable operation of reboiler, and to prevent the material from the downcomer of the last plate in tower from short-circuiting into the product, so as to maximize the separation performance of the reboiler.

Key words: reboiler, thermosiphon, baffle, separation performance