Ammonium Chloride Flow Deposition Prediction Study In Reactor Effluent Air Coolers

Frequent occurrence of flow corrosion failure caused by ammonium chloride deposition inhydrogen air condenser (REAC) system in the development process of petroleum refining asequipment scale become more large and raw oil become inferior serious effect factorysecure,stably, long-term and excellent operation. The fluctuating range of Cl-canteen in raw oilis great. Ammonium chloride flow deposition effect by multi-physical coupling effect. Thefailure mechanism is complex, and there isn't scientific prediction method for flow deposition. Inview of the above reasons, this article plans to carry out numerical calculation and experiment ofammonium chloride flow in sedimentary in REAC to establish ammonium chloride sedimentaryforecast method, thus it can provide theory support for optimize design and operation of REACsystem.This paper develop numerical simulation and forecast experiments of ammonium chlorideflow sedimentary deposition under multi-physical coupling efface, taking the failure REAC tubebundle of YZ as research object.First of all, composition of multiphase flow and physical parameters of REAC entrancewas acquired by using petrochemical process software HYSIS. Then the model to calculateammonium chloride crystallizes temperature and determine the dew point of liquid water wasfounded.Then, ammonium chloride flow of sedimentary mathematical model were founded underthe coupled action of flow field, temperature field and concentration field combining with resultsof the simulation for the physical properties by using HTRI calculation software analyzes theheat hydrogenation REAC system over temperature distribution in the trend. And the physicalfield coupling analysis software won over more inside field under the coupled action ofammonium chloride flow deposits distribution law, puts forward to ammonium chlorideconcentration distribution characterization of the flow deposits danger area, predict get distanceair condenser over the entrance0.65m place over the top easy happening ammonium chloride flow sedimentary failure.Finally, the test scheme of ammonium chloride flow deposition was determined, the testplatform of ammonium chloride flow sedimentary was designed in REAC combined with REACtechnology related process, and ammonium chloride flow sedimentary morphology was obtainedby optical test system.The results of experiment show that the sedimentary position is located in about0.625m inthe entrance location which is consistent with numerical simulation results. So, the correctnessand reliability of the ammonium chloride flow sedimentary numerical prediction method andprovide reference for subsequent experiment.The innovations of this paper are as follows: Realize the numerical simulation ofammonium chloride salt flow deposits under multi-physical coupling of flow field temperaturefield and concentration field combining with actual REAC system complex process of flow, heattransfer and corrosion. Design and set up the construction site hydrogenation REAC systemammonium chloride flow deposits test system. Carry out flow deposits experiment research byusing high pressure as a mirror and optical test system and verify the reliability of the simulationmethod. Establish the research method of prediction for ammonium chloride flow depositioncombination numerical prediction with flow sedimentary experiment.