Problems with pre-sulfurization in hydrocracking
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Colleagues, the pressure in the reaction system is 12.0 MPa, and the temperature at the reactor inlet remains at 140°C. The volume space velocity is 1.5 h⁻¹, the hydrogen-to-oil ratio is greater than 700, and the purity of hydrogen in the recycle hydrogen is greater than 85%. The new hydrogen compressor K-101 and the cycle compressor K-102 are operating normally, with a circulating hydrogen flow rate of 250,000 Nm3/h. The distillation system is operating in a short-cycle mode at 150°C, and it is ready to receive the oil from the reaction process at any time. What are the potential hazards if the distillation process is not operated in this short-cycle mode during this period?
The short cycle for distillation is intended to save startup time; once the pre-sulfurization of the reaction system is complete, changing the cycle allows for adjustments in the operation to obtain the desired product. It’s easy to imagine what would happen if the short cycle wasn’t used
The start time has been extended, resulting in a later date for the products to meet quality standards
Short-cycle oil transportation in the distillation system: one purpose is to test the distillation system, and oil transportation involves water contamination； One is the sulfidation of the reaction system and high heat exchange ； Another point is to shorten the project start-up period
The short-cycle oil operation at 150°C in the fractionation system is intended to further remove the free water contained in the oil. It is to better control the pressure of the reflux system in order to achieve a higher temperature in the future.
It affects normal operation and the heat exchange in the reaction system. . .
Start-up time is extended, and product adjustments are slow