Abstract
The corrosion failure of the high-pressure heat exchanger in a petrochemical enterprise was simulated. A multiphase flow and heat and mass transfer simulation shows that the vortex core with a higher gas phase content and lower temperature is the region of easy crystallization, located on both sides of the center of the tube. The crystallization process occurs in the gas phase. As the reaction progresses, the crystallization range spreads from the tube wall to the center of the tube bundle, and the inner diameter of the tube bundle decreases continuously. In Fluent, a user-defined function, based on the ammonium chloride crystallization reaction, is loaded. The results show that crystallization first occurs in the tube bundles on both sides of the center of the tube and that the corrosion is aggravated by the erosion wall surface of crystal particles at the elbow, which is consistent with the actual corrosion failure location.
Highlights
Flow and Heat and Mass Transfer for Keywords: high-pressure heat exchanger for hydrogenation unit; inferior crude oil; ammonium salt crystallization; numerical simulation; corrosion
Based on the correlation technological process of the high-pressure heat exchanger in the hydrogenation unit, ammonium salt crystallization and the corrosion mechanism were studied and the inner flow field was simulated by using the mixture model
The intersection of the actual operating line of the heat exchanger and the ammonium chloride crystallization curve determines that the crystallization temperature of ammonium chloride is 216.5 ◦ C
Summary
Flow and Heat and Mass Transfer for Keywords: high-pressure heat exchanger for hydrogenation unit; inferior crude oil; ammonium salt crystallization; numerical simulation; corrosion. In the petrochemical production process, hydrogenation products of chlorine, nitrogen and sulfur are ubiquitous in the hydrogenation reaction effluent system due to its production characteristics These impurities lead to the corrosion and leakage of operating equipment in the hydrogenation unit. Reduce or even avoid safety accidents caused by ammonium chloride corrosion, a large number of studies on the reasons and corrosion properties of ammonium salt crystallization have been carried out. They are mainly divided into mechanism studies, experimental studies and numerical simulation studies of ammonium salt. There is much research on the corrosion of ammonium salt in an air cooler, but little research on the corrosion of ammonium salt in a heat exchanger
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
