| Catalytic reforming is an important secondary oil processing process with naphtha as raw material to produce high octane number gasoline and organic chemical raw materials,also produces a considerable amount of by-product hydrogen gas.Except for light oil hydrogen unit in the refinery,hydrogen production by reforming is the largest source of hydrogen.Its price is low,but concentration is low,before use it should be concentrated.Therefore,enrichment of the hydrogen gas from catalytic reforming has an important practical significance.In this paper aromatic potential content and conversion of reforming were calculated,and the recycle hydrogen recontect to reformate and bottom oil of stable tower were calculated using nomogram method and convergence pressure method,respectively.Finaly,the two proposed hydrogen enrichment technologies were compared.Calculation results show that:the hydrogen concentrations calculated by nomogram method and convergence pressure method were 82.6%and 82.5%,respectively.And the hydrogen concentration of theactual industrial device was 82.3%,showing the results obtained by these two methods were consistent with the actual well,which can be used to guide industrial production.The effects of the system temperature and the pressure for recontact layout for stable tower bottom oil and reformate were studied,and the corresponding optimum operating conditions were given.It was found that the hydrogen concentration increased with decreasing the system temperature and increased with increasing the system pressure.For recontact layout of the stable tower bottom oil,the hydrogen yield was 84.1%at pressue of 1.48 Mpa,temperature of 40℃,while for recontact layout for reformate the hydrogen yield was 82.6%under the same temperature and pressure.The hydrogen yield with the recontact layout of the stable tower bottom oil is higher than that of the reformate recontact layout by 1.5%,showing the former is superior to the latter. |
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