Learn about hydrogenation unit knowledge from experts
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I would like to ask fellow sailors and experts: what aspects should be given special attention during the normal operation of a hydrogenation reforming unit? Which operating conditions and precautions need to be adjusted primarily?
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When a hydroprocessing unit is operating normally, key aspects to pay attention to include the quality of the feedstock, the temperature and pressure in the reactor, and the activity of the catalyst. The main operating conditions that are adjusted include the feed rate, reactor temperature, pressure, and hydrogen-to-oil ratio. Precautions include ensuring the equipment’s sealing, regularly checking and replacing the catalyst, monitoring the system’s pressure and temperature, and preventing overheating or overpressure. .
Common adjustments: Processing volume (mainly based on scheduled orders; operations are carried out in accordance with these orders, and when the equipment is stable, there is little room for adjustment)； The outlet temperature of the heating furnace (the inlet temperature of the reactor) varies to some extent depending on the properties of the raw materials and the operating cycle ； II. The inlet temperatures of the second and third bed layers are generally not adjusted, unless there are significant changes, especially when producing different types of products ； The hydrogen-to-oil ratio is generally quite fixed; I don’t adjust it much here ； Top temperature of the distillation system ； Bottom temperature ； Side line distillation temperature ； Product delivery temperature ； Reflux tank inlet temperature ； Steam supply volume ； Water injection volume ； Corrosion inhibitor injection volume. Precautions: High pressure leaking to low pressure ； Stabilize system pressure ； Pay attention to changes in raw materials ； Pay attention to the heating/cooling rate and pressure rising/falling rate ； Changes in the ratio of upstream raw materials ； Temperature rise changes in each bed of the reactor ； Cold hydrogen valve opening ； System pressure ； Heater outlet temperature ； Bed pressure drop.
Additional notes: Pay close attention to high pressure drops associated with high temperatures, the pressure drop in the reactor bed, and high pressure drops in the feed section. Monitor the levels of S, N, and C7 insolubles in the crude oil, as well as the nitrogen content in the refined oil. Also keep an eye on the iron ion concentration in sulfur-containing wastewater, the flow rates of water entering and leaving the plant’s circulation system, corrosion caused by the dew point of flue gases in the heating furnaces, corrosion at the tower tops, and salt deposition in heat exchangers