A correction method for the proportion of key components in basic HYSYS library based on an improved squirrel search algorithm

HYSYS is an important simulation tool for refining processes, in which the basic proportion of key quality components are provided. However, the proportion is often kept unchanged. This often deviates from the actual production, in which the crude oil has become heavier and more inferior. As a matter of fact, the component proportion directly affects the properties of the feed oil and the modeling accuracy. In this paper, to accurately model the operation of a real industrial residue hydrotreating unit in a refinery, a correct method is proposed to calibrate the parameters of residual library basic component based on improved squirrel search algorithm (ISSA). The method takes the ratios of the basic components as the decision variables, and uses ISSA to minimize the deviation of the simulated values of density, sulfur and nitrogen content and the TBP distillation from the lab analysis values. In order to enhance the exploitation ability of the algorithm, an adaptive strategy is used to adjust the scale factor. Moreover, other squirrel position information is introduced for iterative population updating in this algorithm, which can handle the weak exploration ability at the stagnation in late period. Simulation results show that the corrected residual library coefficient can accurately reflect the actual feeding situation of the residue hydrotreating unit, which can ensure to realize high-precision simulation.