Abstract:

This paper introduces the application and preparation method of ethylene glycol (EG) in industry, discusses the process flow of multi-effect evaporation system in EG plant by EO hydration, and analyzes its equipment layout. According to the minimum NPSH of the pump, the installation height of the final vacuum effect reboiler condensate tank is obtained. In combination with the requirements of the process installation height between the condensate tanks, the installation height of the previous several effect condensate tanks is calculated, and then the minimum installation height of the reboiler and the multi-effect tower is further calculated. Thus, the structure height of multi-effect tower skirt and equipment frame can be reduced as much as possible while meeting the process conditions and piping requirements, so as to optimize the design of multi-effect evaporation system in EG plant.

Key words: multi-effect evaporation, piping, installation height