What is the effect of interrupting the water injection on the reaction?
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What is the effect of interrupting the water injection on the reaction?
The impact is: overreaction or underreaction; in short, it’s either unqualified or only passable, and in severe cases it’s considered defective
Which device and at which location is water injection carried out?
The interruption of water injection leads to an increase in the ammonia content in the circulating hydrogen, which affects the acidic sites of the catalyst and results in a decrease in its activity
It is generally believed that the interruption of water injection leads to a decrease in reaction depth, but the answer provided in the Hydrocracking FAQ is that the interruption of water injection causes an increase in the hydrogen sulfide concentration in the recycle hydrogen, thereby increasing the reaction depth.
Before high-pressure air cooling in diesel hydrocracking
Pre-cooling water injection at the terminal leads to an increase in the ammonia nitrogen content in the circulating hydrogen, which reduces catalyst activity and lowers the conversion rate of the hydrogenation reaction. Prolonged operation can lead to the crystallization of ammonium hydrogen sulfide salts in the air-cooled tube bundle, resulting in an increase in the pressure drop across the entire system.
Does an increase in hydrogen sulfide concentration not lead to a decrease in reaction depth?