Crystallization Behavior of Ammonium Chloride in High-Pressure Heat Exchanger of Hydrotreating Unit

Zhang Jianwen; Zhang Fan; Li YanZhao YahuiSheng Gang

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Crystallization Behavior of Ammonium Chloride in High-Pressure Heat Exchanger of Hydrotreating Unit

机译：Crystallization Behavior of Ammonium Chloride in High-Pressure Heat Exchanger of Hydrotreating Unit

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In view of the corrosion failure of a high-pressure heat exchanger in a diesel hydrogenation unit, the formation mechanism of ammonium chloride in a multiphase flow system is investigated in this article. Numerical simulation is carried out by user defined function (UDF) on the process of adding source of mass transfer in computational fluid dynamics (CFD) solvers. The distribution characteristics of ammonium chloride are illustrated by the parameters including crystallization temperature of ammonium chloride, volume fraction of ammonium chloride, and mass transfer rates of NH3 and HCl, and the causes of corrosion cracking in the U-shaped bend of the heat exchanger are discussed. The results show that there is a great risk of ammonium chloride deposition in the heat exchanger from 4.5 m away from the outlet of the second pass. The crystallization area in the tube gradually expands from the wall to the center along the flow direction, and the crystallization rate is higher near the tube wall. The field sampling test results show that the corrosion cracking is hydrogen-induced cracking, which is due to the existence of large amount of hydrogen, high impacting force, excessive flow rate, and the risk of ammonium chloride particle erosion at the U-bend. In order to alleviate the corrosion of ammonium chloride deposition, some improvement measures are put forward, such as raising the inlet temperature of the tube side to 215 degrees C and increasing the water injection by 30%, which play an important role in decreasing the formation of ammonium chloride in the heat exchange system.

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《Mathematical Problems in Engineering: Theory, Methods and Applications》 |2021年第52期|5056631.1-5056631.15|共15页
作者
Zhang Jianwen; Zhang Fan; Li YanZhao YahuiSheng Gang;
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Beijing Univ Chem Technol, Lab Fluid Flow & Heat Transfer, Beijing 100029, Peoples R China|Beijing Univ Chem Technol, IGCIT, Beijing 100029, Peoples R China|Beijing Univ Chem Technol, Dept Mech & Elect Engn, Beijing 100029, Peoples R China;

Beijing Univ Chem Technol, Lab Fluid Flow & Heat Transfer, Beijing 100029, Peoples R China|Beijing Univ Chem Technol, IGCIT, Beijing 100029, Peoples R China;

Lanzhou Petrochem Res Inst, Lanzhou 730000, Gansu, Peoples R China;

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Crystallization Behavior of Ammonium Chloride in High-Pressure Heat Exchanger of Hydrotreating Unit

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