Hydrocracking cycle hydrogen with oil contamination
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The purpose of carrying oil in the hydrocracking cycle hydrogen, and how to remove the oil quickly?
Slightly increase the temperature, and then raise the amount of circulating hydrogen to its maximum level.
What temperature should be set as appropriate? Our equipment has stopped operating
Isn’t the temperature of hot hydrogen carrying oil during shutdown specified in your operating procedures?
What you’re referring to is hot hydrogen stripping; the temperature should be set at the highest level used during normal production, and the amount of recycled hydrogen should be increased to the maximum possible level
The maximum amount of recycled hydrogen is used, with the temperature being controlled to be above the final boiling point of the feedstock. Raising the heavy oil hydrogenation temperature to the final boiling point of the displaced oil is done to the greatest extent possible under given conditions
What you mean is stopping the hot hydrogen circulation to extract oil; the temperature is usually controlled at around 350°C. Depending on the overall operating conditions of the compressor, it is decided whether to operate at near the maximum theoretical speed, which helps to ensure a high hydrogen flow rate and thus an effective hot hydrogen stripping effect.
The oil is used to remove the oil stored in the heat exchangers and reactors, thereby facilitating maintenance. Increase the amount of circulating hydrogen to carry oil
The premise is that the oil stream must be clean; secondly, it must not affect the pressure drop across the bed. This process can’t be accelerated – it requires careful, slow work. All that can be done is to increase the circulation rate appropriately