Advantages and disadvantages of catalytic pre-heating of dry gas
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Pre-raising of dry gas only saves a small amount of steam, but it increases the load on the compressor. For the turbine, it consumes medium-pressure steam, which in turn increases the load on the absorption and stabilization system as well as raising energy consumption. In terms of the reaction system, it is said that the small amount of hydrogen present in the dry gas can prevent catalyst poisoning by heavy metals; so, should metal passivators no longer be used? After the dry gas pre-lifting system is put into use, how does the hydrogen content in the components of the dry gas change? There is also catalysis. What are the advantages and disadvantages of using pre-heated dry gas in terms of coking in the reaction system, and how does it affect things? What other advantages and disadvantages does pre-heated dry gas have? Please share your thoughts and discuss whether it should be used or not
If the compressor load is insufficient and backflow needs to be generated, dry gas can be used as a pre-lift medium. Dry gas can passivate the heavy metals deposited on the catalyst surface, reducing the dehydrogenation reaction and, at the same time, minimizing the hydrothermal deactivation of the catalyst at high temperatures. Even after enabling dry gas pre-lifting, a passivator still needs to be added, as the ability of dry gas to passivate heavy metals is limited.
I think we should also consider whether the temperature resulting from the mixing of dry gas and steam causes the steam to contain water, as this could affect the quality of the finish. It has an impact on the catalyst.
Dry gas can suppress catalyst coking; its main component is hydrogen