| In recent years,Chinese crude oil dependence has reached a warning value,and major refineries have carried out different levels of capacity expansion to cope with the international situation.The process simulation software can accurately calculate the material and heat data of the entire process on the computer.By the PRO/II software,the 1 million tons per year crude oil atmospheric pressure device of Ningxia Baota Petrochemical Company was simulated and expanded,and the specific transformation process and operating parameters were proposed to make the production capacity after the transformation reach 2.5 million tons per year.50% Changqing crude oil and 50% M100 fuel oil mixed oil was regarded as raw material oil to prepare for the cutting of the virtual components of the raw material oil.The original process simulation was carried out for the operation condition of the original 1 million tons per year atmospheric pressure device,and finally the temperature pressure of each section and the real boiling point distillation data of the product were obtained.The error between the analog value and the actual value didn't exceed 6%.The simulation of the atmospheric pressure device by the PRO/II software truly reflected the operation of the device,which provided the foundation for the next step of transformation.In order to increase the adaptability and operational flexibility of the device,the process simulation and optimization of the electric desalination-primary distillation tower-normal pressure tower and electric desalination-flash tower-normal pressure tower were carried out.The analysis of the optimization of electric desalination-primary distillation tower-atmospheric tower is analyzed.The maximum output of and200# solvent oil was selected as optimization targets,and the sensitivity analysis and operation optimization of the operating variables were respectively performed.After optimization,the quality of top oil of primary distillation tower reached the standard and the output increased by 47kg/h.The pulling rate of the primary distillation column has increased by 2.7%,and the energy consumption of the atmospheric pressure furnace decreased by 2.58 k W.The mass flow rate of 200# solvent oil of Changyi Line increased by 190kg/h,and the quality of each side line product reached the standard.According to the optimization results,the author obtained a specific operation plan and analyzed the temperature and pressure distribution of the tower equipment and the distribution of vapor and liquid load.Then this paper gave specific transformation content and the transformation process.The material balance,furnace energy consumption,stripping steam volume and condensing energy consumption of initial process and later process were analyzed.The results showed that the establishment of the first distillation column to replace the flash tower greatly reduced the heating energy consumption of the atmospheric furnace though it added a condensing system.But the total energy consumption has been decreased and oil loss has been reduced from 1.4%to 0.55%.The results showed that the process of electric desalting-primary distillation tower-atmospheric pressure tower successfully uses load transfer technology to achieve the purpose of increasing production and reducing consumption.It greatly utilized existing equipment so that equipment investment is minimized.This paper provides technical support for the expansion and transformation of Baota Petrochemical Company's 1 million tons/year atmospheric distillation unit and provides reference for other refining industries. |
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