The system of hydrogenation unit

Hydrogenation unit includes high pressure system and low pressure system. In the connecting parts of the two, such as hot and high pressure separator oil to hot and low pressure separator, cold and high oil to cold and low oil, circulating hydrogen desulfurization and rich amine liquid from desulfurization tower to rich amine liquid flash tank, high pressure medium is generally injected into low pressure equipment through high pressure Angle valve depressurization.

It is the development trend of energy saving design of oil refinery to achieve energy saving of whole plant by means of unit union. The joint approach can be in the form of material flow, such as the fractional utilization of hydrogen, or in the form of energy flow, such as the flow of one set of devices to provide heat sources for the heat transfer equipment of another set of devices.

There are usually multiple sets of hydrogenation units in the total processing process of refinery,  the pressure grade of each type of hydrogenation unit decreases in the order of residuum hydrogenation > hydrocracking > wax oil hydrogenation > diesel oil hydrogenation > jet fuel hydrogenation > naphtha hydrogenation. Step utilization of hydrogen between units is an effective measure for overall energy saving of hydrogenation units.

When the low temperature heat of the hydrogenation unit is not absorbed by a suitable cold source in the unit, the external output can be considered.

Thermal feeding and discharging between devices can effectively reduce energy consumption.