Study On Simulation And Heat Exchanger Network Optimization Of Atmospheric Distillation Unit A Refinery In Northern Shaanxi Province

In petroleum processing,the role of crude oil atmospheric distillation unit is extremely critical,and its energy consumption accounts for about 30%of the total refinery.The design and operation quality of crude oil atmospheric distillation units directly affect the utilization of oil,product quality and refinery yield.Therefore,we must constantly optimize the design of the plant so as to reduce the energy consumption of the refinery and increase the refinery capacity.Thermal energy utilization.In this study,the atmospheric distillation unit of a refinery in northern Shaanxi was used as a practical research object.The software was used to simulate the operation flow of the plant and a specific optimization design strategy was found on this basis.The main research content is:(1)Using software to simulate the operation flow of an atmospheric distillation unit of a refinery in northern Shaanxi,and rationally designing simulation parameters based on the nature of crude oil and the design of the plant.By introducing the GS thermodynamic model,the operation parameters of the distillation column and the material balance parameters of the crude oil plant were determined,and the distributions of the gas-liquid pressure,temperature,and load under the two processes were obtained.The process simulation results meet the requirements of the process indicators,indicating that the simulation results are consistent with the actual conditions of the plant.(2)According to the actual data provided by the refinery,the use of software to analyze the effects of reduced steam stripping volume and increased circulation of the atmospheric tower,the refining tower’s atmospheric tower processing capacity and the entire process energy consumption.Increasing the number of circulations in atmospheric towers can effectively increase the reflow heat at high temperature.This will not only help to improve the processing capacity of the atmospheric tower,but also help to save energy;reducing the amount of steam stripping also contributes to the processing capacity of the atmospheric tower.The improvement can also be beneficial to reduce energy consumption.Although the above two optimization measures will affect the separation effect to a certain extent,if the adjustment range of the parameters is small,the product quality can still be guaranteed.(3)Optimize the original atmospheric distillation device through the heat exchanger network.The principle is to further enhance the effect of raising the circulating reflux number and increasing the impact of the high temperature position reflow heat on the entire heat exchange network.The original atmospheric tower adopts two mid-stage designs.Under the premise of keeping the total circulation return flow constant,the total circulation return flow is scientifically configured according to the pinch point technical rules,and the former two mid-cycle circulation numbers are increased to three.One,and based on the original heat exchanger network to adjust the cold flow and Chang three intermediate heat transfer sequence,thus saving more energy,according to the results of this study show that without affecting the product quality under the premise of the original atmospheric pressure After the distillation device was optimized,the heat load of the heating furnace was significantly reduced,and in addition,the final temperature of crude oil preheating was also increased.