Operation And Optimization Of Gas Fractionation Unit

The article takes the 300,000 t/a gas fractionation unit of Yan’an Oil Refinery as an example to show the economic optimization strategy.The process simulation software Aspen plus is used as the calculation tools. Combined with production operation and equipment surplus,and considering both the cost of production and product yield, the operating parameters is adjusted to reduce the reboiler duty and improve the product yield, in which way the overall economic income can be effectively increased.The optimal parameters and optimizing approach of the gas fractionation unitoperation are gmen.The main purpose of the gas fractionation unit operation is reducing propylene exhaust and heat consumption by controlling deethanization tower and propylene rectification tower. Presently,many problems exist in gas fractionation,such as high reflux ratio,high operating pressure,wide range of pressure variety and excessive purity of product,which cause high energy consumption and reducing the benefit ofthe unit.Therefore,the tower pressure should be kept stably.For the requirement of product quality.the reflux ratio,temperature and pressure should be as lower aspossible according to the calculating results by Aspen Plus.As to the operation of deethanization tower,it is reasonable and beneficial to improve tower pressure properly.It has a remarkable meaning for reaching the goal of realization of the fine chemical stratagem and transformation of the product from exerting the potential of the gas fractionation unit and reducing the process cost of refinery.The results of this thesis should have a guided value on designing and operating the gas fractionation unit with different feed sources.