Bed temperature control in diesel hydrogenation reactors
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The topic of my graduation project is the design of the automatic control system for a diesel refining unit. I hope that experts can offer some guidance regarding the design of the temperature control system for the hydrogenation reactor bed; what control methods would be suitable, as well as the principles for selecting valves and determining flow characteristics.
The hydroprocessing of gasoline and diesel is a reaction that takes place under high temperature and pressure; therefore, safety interlock controls are incorporated in the design, with two-out-of-three interlocks being commonly used, or even more advanced types. In addition to the DCS, with a SIS system in place, valve selection favors high-pressure valves to facilitate rapid shutdown. It really depends on your design requirements.
Haha, you’ve already implemented this project in practice. The bed temperature is influenced by factors such as the furnace outlet temperature, space velocity, and hydrogen partial pressure. For single-zone bed temperature control, cold hydrogen is generally injected; once the desired bed temperature is set, the automatic cold hydrogen control valve will adjust its opening degree as needed.