Computer Simulation Of The Fischer-Tropsch Oil Cutting Process

With the shortage of the world’s oil resoueces and the increasing environmental requirements, the technology of turning coal and gas into liquid fuel using Fischer-Tropsch synthesis has become the focus. Belonging to clean fuel, The biggest advantage of Fischer-Tropsch oil is sulfur-free and no nitrogen, which consistent with the increasingly strict environmental regulations. Due to the diversity and complexity of Fischer-Tropsch process, many countries still invest much money on researching the process of Fischer-Tropsch synthesis, while the study on the separation of F-T oil products is relatively less. Many features of F-T separation products is still not known wildly.In this paper, the physical and chemical properties of Fischer-Tropsch oil samples were tested. Based on these data, the large chemical technology process simulation software, Aspen Plus, is used to simulate the separation process of Fischer-Tropsch oil. For different cutting and product requirements, suitable distillation process is compared and selected. The secondary atmospheric and vacuum distillation process, three-level atmospheric and vacuum distillation process, secondary atmospheric distillation process and three-level atmospheric distillation process are simulated respectively, the parameters of temperature, pressure, flow, energy, product quality and distillation range are obtained. The distribution of temperature, pressure, gas flow and liquid flow on trays are Analyzed. In the secondary atmospheric distillation process focused on the product of petroleum additives, sensitivity analysis is carried out to study the effects of atmospheric furnace temperature on product flows. Economic analysis of the atmospheric furnace temperature, which is the key factor of economic consumption, is carried out based on the data obtained. The optimal operating atmospheric furnace temperature is figured out under the premise of ensuring product quality.The result shows that for the atmospheric and vacuum distillation process with a capacity of 300kt/y, the three-level process with a preflash is better than the secondary process. For the secondary atmospheric distillation process focused on the product of petroleum additives, the product separation quality increased with the temperature of atmospheric furnace. On the premise of ensuring product quality, the optimum furnace temperature is 310 degree which maximize the income to 1899 yuan per ton Fischer-Tropsch oil.