关键词: 加氢尾油,    ,  裂解炉,    , 结焦,    ,  裂解温度,    ,  水油质量比

Abstract: In order to study the effects of the pyrolysis conditions on the coking rate of the HVGO during pyrolytic process, the coking experiment was carried out using the hydrogenation tail oil pyrolysis experiment equipment. Reaction conditions including pyrolysis temperature, wateroil mass ratio and flowing velocity of raw material on the effects of cracking furnace tube coking rate were examined during the pyrolytic process of hydrogenation tail oil. And coking samples were characterized and analyzed by SEM，EDS，DSCTG and EA. The results showed that the coking rate gradually was increased from 2.16 mg/(cm2·h) to 7.90 mg/(cm2·h) with the temperature increment, the coking rate was increased gradually form 3.36 mg/(cm2·h) to 11.02 mg/(cm2·h) with the increasing of the mass flowing rate, and the coking rate was reduced form 7.56 mg/(cm2·h) to 4.89 mg/(cm2·h) with the increasing of the wateroil mass ratio. The carbonhydrogen mass ratio of coke was increased gradually with the increasing of temperature, the prolongation of time and the reducing of wateroil ratio. Carburizing phenomenon happened in coke which formed on the furnace tube wall. To sum up, the most suitable pyrolysis conditions of the HVGO are that the temperature is about 850~850 ℃， the mass flowing rate is about 193.80 g/h and wateroil mass ratio is 0.5~0.7.

Key words: HVGO,    ,  Cracking furnace,    , Coking,    , pyrolysis temperature,    ,  Wateroil mass ratio