Experimental study on the dew point corrosion behavior in atmospheric tower system

Abstract

Atmospheric towers are large pieces of equipment used in the petroleum refining process. Hydrochloric acid dew point corrosion often occurs at low-temperatures in the tower. In order to study the dew point corrosion problem of atmospheric tower in a petrochemical enterprise, the process simulation method was used to determine the logistics parameters in the high risk area of dew point corrosion of atmospheric tower system. Based on this, the experimental conditions were set up to closely integrate laboratory research with engineering practice. In view of this special and complex corrosion process, a dew point corrosion experiment was designed to realize the dew point condensation process. The influence of concentration and temperature on the dew point corrosion rate was explored by an electrochemical test and a corrosion weight loss method. The results show that the initial dew point temperature of the tower is 89 ℃, and the risk area of dew point corrosion is located at the top of the tower and in the position of the volatile line, which is consistent with the actual corrosion area of the equipment. In this logistics environment, the dew point corrosion rate of Q345R steel increases with the increase in HCl concentration and temperature in the atmospheric tower system.