Hydrofining shutdown
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During the shutdown of hydrorefining, after hot hydrogen is used to carry the oil, hot nitrogen is employed for the same purpose along with displacement. When using hot nitrogen in this circulation process, what impact does it have if the reactor temperature is set at 415 while it should be 350? The temperature is so high!
Generally, to prevent the catalyst from undergoing hydrodecomposition during the process of introducing oil into hot hydrogen, thermal nitrogen dehydrogenation is not recommended, as it is difficult to control the hydrogen sulfide content in the circulating hydrogen. Replacing the gas with nitrogen is also a practical challenge; it’s sufficient to directly measure the hydrogen sulfide content through dehydrogenation. Your process temperature is a bit high – 250–300 degrees should be sufficient, as this helps to dilute the hydrogen dissolved in the reactor.
How much nitrogen is needed for hot nitrogen oil carrying? The pressure is certainly lower than that of hydrogen, and the amount of circulating hydrogen is small, which is not conducive to oil carrying. After oil carrying is completed, isothermal dehydrogenation takes place; generally, there is no problem even without dehydrogenation at an operating pressure of 6–7 MPa. The temperature agrees with what was said upstairs
Thank you very much for your reply. What I mean is that the hot hydrogen with oil has been used; the system pressure was 5.8 MPa, and it dropped to 1.0 MPa. Nitrogen was then used to purge the system, and the pressure decreased, but the system temperature remained around 300 degrees. The designed temperature for the reactor is 415 degrees； Will this have an impact on the material of the equipment? ? Whenever hydrorefining is shut down, as long as the system contains hydrogen sulfide, hydrogen is used to carry the oil first; I don’t understand what you mean by hydrogenolysis Could you elaborate? Is it difficult to control the sulfur content in the recycle gas in thermal nitrogen dehydrogenation? Are you worried that the circulating hydrogen contains hydrogen, and that without hydrogen sulfide to reduce the catalyst? What are the optimal temperature and pressure for hydrogen evolution in a reactor? Is it better for hydrogen circulation or nitrogen circulation in the circulating hydrogen for hydrogen desorption from the reactor wall? Help needed
What are the optimal temperature and pressure for hydrogen removal from containers? Diesel refining! Is it better to use nitrogen for hydrogen dissociation or hydrogen recycling for hydrogen dissociation? Why? :(