Study On Process Simulation And Operating Optimization Of 3.5 Mt/a Atmospheric And Vacuum Distillation Unit

Atmospheric and vacuum distillation unit is the first procedure of petroleum processing. The effect of distillation affects the quality and draw ratio of petroleum products heavily. Operating conditions needs to be adjusted frequently because of the change of crude oil property parameters. In view of the function of atmospheric and vacuum distillation unit of Daqing Petrochemical Corporation, process simulation and operating optimization which provided a reference to adjust operating conditions of the plants has been done.According to the flow of Daqing atmospheric and vacuum distillation unit, the paper applied Sequential modular method on primary tower, atmospheric tower and vacuum to perform process simulation. First of all, crude oil was cutting into several pseudo components which act as input of primary tower according to its true boiling points data. Secondly, proper module unit and convergence method were selected, and simulation models and process parameters were regulated subsequently. At last, process simulation of primary tower, atmospheric tower and vacuum were calculated in turn. Simulation results of primary tower were in accord with plant data except slight deviation of gasoline quality. Simulation results of atmospheric tower such as temperature, pressure and products quality were all in accord with plant data. Simulation results of vacuum were in accord with plant data except slight deviation of the second lubricating oil and vacuum residue. The simulation results indicated that the process simulation reflected the function of Atmospheric and vacuum distillation unit.With the draw ratio of aviation kerosene as the optimization objective, off-line operating optimization has been done by the plant model of process simulation. Firstly, Single variable sensitivity analysis had been done to find variables that affect aviation kerosene obviously. Secondly, operating variables were selected according to the results of sensitivity analysis, and quality parameters of atmospheric products were selected as restrictions. At last, off-line optimization of atmospheric tower was calculated by SQP. Results of optimization indicated that the draw ratio of aviation kerosene was increased and...