The ethylene glycol regeneration unit of a certain offshore platform experienced fouling in the reboiler,dirty and blocked filters,and blocked control valves in a short period of time,which affected the normal use of the entire regeneration unit.By conducting FT-IR,GCMS,XRD,SEM+EDS analysis on the composition of the scale sample,the information on the composition of the scale is obtained.Based on the comprehensive analysis of the detec-tion results and the actual situation on site,it is pointed out that the reason for the scaling of the regeneration unit is that during the heating and heating process of the reboiler,the solu-bility of some salts decreases,while the water evaporates and the salt concentration increas-es.The supersaturated salt crystallizes and deposits from the solution,forming a scale,main-ly composed of soluble carbonate.The high temperature of the reboiler is the reason for the short-term scaling of the regeneration unit.Additionally,due to the presence of divalent cations such as calcium and magnesium in the rich ethylene glycol,a small amount of insol-uble carbonate accumulates in the system.
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