关键词: 精馏塔, 重沸系统, 重沸器结构, 塔釜结构, 再沸比, 液相短路,

Abstract:

The characteristics of different types of reboilers and kettle structures inside the distillation tower are discussed. HYSYS and HTRI software are used to simulate and select reboiler systems with different reboil ratios. The performance of different reboiler systems(heat duty, reboiler temperature, heat exchange area, etc.) is analyzed and compared. The results show that for a medium reboil ratio system, such as the stripper in an absorption stabilization system, the installation of a perforated baffle in the tower kettle can significantly improve the separation performance of the reboiler system and reduce the required heat exchange area of the reboiler. For low reboil ratio systems, it is more suitable to choose a kettle type reboiler and once-through reboiler systems. For high reboil ratio systems, it is preferred to use thermosyphon reboiler system with no baffle or constant head baffle. In addition, in examining the liquid short-circuiting in the bottom tray of the distillation tower, it is found that its impact on once-through reboiler systems and thermosiphon reboiler system with a preferential baffle in the tower kettle is significant. This study provides theoretical guidance on the selections and industrial designs of reboiler system in distillation tower based on the reboil ratio.

Key words: distillation tower, reboiler system, reboiler structure, tower kettle structure, reboil ratio, liquid short-circuiting,