| The operating condition of fractionator system in delayed coking unit directly affects the energy consumption of the device and the normal operation of the downstream equipment and products quality. A model of the main fractionator system was established and the energy consumption status of the fractionation column was analyzed using Aspen Plus process simulation software with proper simulation strategy. Aiming at improving the final temperature of vacuum residue, a best combination of the pump-round flowrates of the fractionation column was obtained with Aspen software and orthogonal experiment method. The results prove that, the final temperature of vacuum residue can be improved from295.8℃to306.6℃around by increasing the pump-round flowrates of diesel and bottom circulating oil and decreasing those of top reflux and heavy wax oil.A current heat exchange network model of fractionator system was established with Aspen Energy Analyzer software. Based on the theory of pinch point, the status of system energy utilization was analyzed, and the threshold temperature was calculated to be40.5℃. The current heat exchange network system was optimized, generating two solutions in ideal conditions:with and without branches and putting forward a feasible and partial solution, which can improve the final temperature of vacuum residue after exchanging heat to313.8℃, and save458.37Nm3/h fuel gas in heating furnace. |
