Investigation and Representation of Practical Methods in Order to Scale Removal in Exchanger 4132 in the Urea Unit of Petrochemical Khorasan

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Abedi, Mohsen | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53049 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Farhadi, Fatollah
Abstract:
In this research, utilizing the concepts of thermohydraulics theory, optimization of cost due to the scale formation in heat exchangers 4131 and 4132 in Khorasan petrochemical Co. urea unit. The objective function involves the minimization of the energy consumption and production losses. First, via ASPEN we simulated shortcuts of exchangers in order to examine the effects of temperature and velocity on the scale formation. The project optimization was done by GAMS and due to the presence of nonlinear terms in the scale rate equations using CONOPT solver. Eventually, modern practical methods were used with the purpose of reduction and eradication of the heat exchanger's scale formation. The investigation shows that for the twin exchangers under study, first, the scale formation reduces cooling water flow by up to 60% in E4132. Second, the optimal values for minimizing cost of scale formation in the exchangers occurs at a cooling water flow rate of 152442.75 kg/h for the exchanger 4132. Among practical methods of preventing the formation and removal of scale, radio wave technology is the best option in terms of efficiency and economy
Keywords:
Heat Exchangers ; Optimization ; Simulation ; Thermohydraulic Analysis ; Scale Formation ; Urea Plant ; Radio Wave

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