Comparative Analysis On Energy Consumption Of Selective Hydrogenation For Removal Of Trace Olefins

The reforming oil produced by a continuous reforming unit in a petrochemical company is fractionated to produce benzene,toluene and mixed xylene,etc.Olefins in reforming oil seriously affect the subsequent aromatics extraction and stable operation of the unit.In order to solve the problems such as poor refining depth,fast deactivation speed and pollution of waste clay in the process of clay adsorption,the clay adsorption process and two selective hydrogenation processes are simulated,compared and analyzed.The main work and the results obtained are as followed:Firstly,the process of clay adsorption is simulated by Aspen Plus,and the operating conditions of the column were determined by continuous operation optimization,which make it accord with the actual production,and prove the accuracy and applicability of the model.The hydrogenation reactor module is designed to solve the hydrogenation reaction process.On this basis,two olefin dehydrating models are designed for the hydrogenation reactor in front of the C₅ tower and the reformed oil fractionator,and a stripper is added to the reactor before the reformer to remove gas.Secondly,the energy consumption and load of each device under the comparison of the clay adsorption and the selective hydrogenation scheme are compared.By setting up virtual logistics,the energy consumption and flow rate of C₅ tower condenser,reboiler,reformer oil fractionator condenser,reboiler and stripper tower are calculated.In comparison with the energy consumption of heat exchangers and pumps under the three schemes,the final determination of the hydrogenation reactor in front of the C₅tower is a suitable modification scheme,which provides a reference for the practical engineering design and reconstruction.