Crude Distillation Unit Heat Exchanger Network Design And Optimization

Energy is the important material base of the survival and development of human society. The medium-term and long-term scientific and technological development of China must give priority to energy technology, of which the importance is to capture energy-saving technology of highly energy-consuming field and to raise a higher usage of disposable energy and terminal energy. Atmospheric and vacuum distillation unit that accounts for 14%-15% of the total energy consumption is a big power consumer in a refinery.In this device, slight energy improvements can save a mass of energy. As far as concerned, there is meaningful to design a reasonable heat exchange network to make atmospheric and vacuum distillation unit have lower energy consumption.This text that takes the data of material flow of atmospheric and vacuum distillation unit in one refinery as basic data takes an optimization design to the atmospheric and vacuum distillation unit by using pinch technology method. At last, the text takes economic accounting on the design of heat exchanger network. The main research contents include:(1)To further study and research the pinch technology, programming to solve pinch position and minimum utilities dosage with method of question table by MATLAB that makes optimization process becomes rapid and accurate. Respectively using artificially hand algorithm and Aspen Energy Analyzer to verify the program and prove to be correct;(2) Dividing the whole heat exchangers networks of atmospheric and vacuum distillation unit into above pinch part and under pinch part by pinch technology. The three basic principles of pinch technology should be firmly grasped when designing. The Pinch that plays the most important role in the entire network must follow the principle that is from pinch to both sides;(3)To adjust the initial heat exchanger network of the atmospheric and vacuum distillation unit by using "disconnect loop method";(4) After proceed the economic calculation for the optimized heat exchanger network, and then the design is completed.