Search

When using superstructure modeling method to optimize the waste hydrogen stream recovery network, it is often difficult to solve the model, or even unable to get the optimal solution. In this paper, the components in the waste hydrogen stream are characterized as hydrogen, condensable light hydrocarbons and fuel gas. The triangular coordinate characterization is established, and the resource recovery optimization method is discussed, so as to form the corresponding constraints on the material balance and stream flow direction. Combined with mathematical constructions, an improved superstructure optimization model is established. The model is verified with a case from a refinery. The results show that under the same calculation conditions, the conventional modeling method and the improved modeling method obtain calculation results after 5.3 seconds and 1.6 seconds respectively. The former does not achieve the optimal solution for some streams, only obtains the suboptimal solution, while the improved method is faster and obtains the best matching network. The annual economic benefits of the two are 10.63 million yuan and 21.44 million yuan respectively, and the latter gains 10.81 million yuan per year more than the former. [ABSTRACT FROM AUTHOR]