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Analysis and Prediction of Corrosion Risk in atmospheric Distillation tower overhead System

China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 21-30页

作者： Niu Luna Han Lei Chen Wenwu Pan Long Zhang Yanling Qu Dingrong State Key Laboratory of Safety and Control for Chemicals SINOPEC Research Institute of Safety EngineeringQingdao 266101

In order to optimize the atmospheric tower overhead low-temperature system,the physical parameters,multiphase composition,aqueous dew point temperature,and ammonium salt crystallization temperature are simulated with process simulation *** temperature distribution in overhead heat exchanger is calculated by heat transfer *** special parts with elbows near the inlet and outlet of heat exchanger are studied by fluid field *** indicate that under current operating conditions,the aqueous dew point temperature and initial crystallization temperature of NH4Cl are 91°C and 128°C,*** salt appears in the distillation tower and liquid water occurs in heat exchanger tubes,in which the dew point induced corrosion is the most direct factor for heat exchanger *** the heat exchanger,condensate water appearing in the area 2.7 meters away from the bundle inlet can give rise to corrosion risk under the moist NH4Cl and high concentration of acidic solution *** the pipes and elbows located near the inlet and the outlet of heat exchanger,the flow field presents an unsymmetrical *** risk areas are mainly concentrated on the external bend of elbows where the liquid water concentration is *** coupling of simulation methods established thereby is approved as an effective way to evaluate the corrosion risk in the atmospheric column overhead system and can provide a scientific basis for corrosion control.

关键词： atmospheric tower overhead simulation corrosion ammonium salt crystallization fluid field

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