关键词: LTAG, 催化裂化柴油加氢装置, 反应器, 反应开工加热炉, 反应温度控制, 多环芳烃

Abstract:

LTAG technology is a technology that selectively hydrogenates and saturates the polycyclic aromatic hydrocarbons of low quality FCC diesel fuel with high aromatic content and poor combustion performance, and then converts them into high octane gasoline or light aromatic hydrocarbons through FCC and refining. Selective hydrodearomatic reaction is an important part of this technology.This paper mainly introduces the design features and application of reactors, heating furnaces and other equipment of the LTAG catalytic cracking diesel hydrogenation unit.The reaction heat of hydrodearomatic reaction is much higher than that of conventional hydrotreating reaction, so the design of this unit is slightly different from that of conventional hydrotreating unit. A new LTAG diesel hydrogenation unit was built in a company. The process of two reactors in series and partial circulation was adopted. A reaction start-up heater was set. A heat exchanger was set between two reactors in series. The inlet temperature of the two reactors was controlled by the outlet temperature of the tube side and shell side of the heat exchanger. This design method can effectively save cold hydrogen and reduce energy consumption.

Key words: LTAG, catalytic cracking diesel hydrogenation unit, reactor, reaction start-up furnace, reaction temperature control, polycyclic aromatic hydrocarbons