关键词: 延迟焦化, 石油焦, 热重分析, 热解, 动力学

Abstract: Pyrolysis of coke from delayed coking was performed by thermogravimetric analysis (TGA) in argon and carbon dioxide atmosphere from room temperature to 1000 ℃ respectively. The mechanism of pyrolysis was discussed. TGA results showed that during the pyrolysis of coke dehydration happened at 50－100 ℃; then significant weight loss started from 400 ℃ and reached a maximum value around 620－640 ℃, which is commonly attributed to the release of volatile matter due to the rupture of side chains from organic compounds; above 800 ℃, weight loss increased remarkably, indicating rapid pyrolysis occurred. The average activation energy was determined using a third-order chemical reaction model to simulate the pyrolysis of coke from delayed coking. In the temperature range of 433－904 ℃, the average activation energy under CO2 and Ar atmosphere was 29.70-44.81 kJ/mol and 57.68－69.44 kJ/mol, respectively.

Key words: delayed coking, petroleum coke, thermogravimetry, pyrolysis, kinetics