Abstract
Based on the theory of finite-time thermodynamics (FTT), the effects of three design parameters, that is, inlet temperature, inlet pressure, and inlet total mole flow rate, of a tubular plug-flow sulfuric acid decomposition reactor on the total entropy generation rate (EGR) and SO2 yield are analyzed firstly. One can find that when the three design parameters are taken as optimization variables, the minimum total EGR and the maximum SO2 yield of the reference reactor restrict each other, i.e., the two different performance objectives cannot achieve the corresponding extremum values at the same time. Then, the second-generation non-dominated solution sequencing genetic algorithm (NSGA-II) is further used to pursue the minimum total EGR and the maximum SO2 yield of the reference reactor by taking the three parameters as optimization design variables. After the multi-objective optimization, the reference reactor can be Pareto improved, and the total EGR can be reduced by 9% and the SO2 yield can be increased by 14% compared to those of the reference reactor. The obtained results could provide certain theoretical guidance for the optimal design of actual sulfuric acid decomposition reactors.
Highlights
ThePinFtot,in of the reaction mixture fronts uniformly in Figure 11 shows that the Ftot,in of the reaction mixture in Pareto-optimal fronts distributes uniformly in its optimal range, which indicates that adjusting the Ftot,in of the reaction mixture in Pareto-optimal fronts is an important means to reconcile the contradiction between the minimum total entropy generation rate (EGR) and the maximum SO2 yield
The results show of the tubular plug-flow sulfuric acid decomposition reactor are analyzed, and the multi-objective optimization for the two performance objectives are carried out by using finite-time thermodynamics (FTT)
The results show that: optimization for the two performance objectives are carried out by using FTT
Summary
The Hybrid-Sulphur (H-S) thermochemical cycle and the Sulphur-Iodine (S-I). Both the H-S and the S-I cycles contain the sulfuric acid decomposition process. The S-I thermochemical cycle consists of three main chemical reactions: (1) the endothermic decomposition of hydrogen iodide in gas phase; (2) the spontaneous absorption of sulfur dioxide in liquid phase; (3) the sulfuric acid decomposition reaction. Reaction typeof(I)thermodynamic is the spontaneous decomposition of H2 SO into SOacid
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