RFCC沉降器内油浆重组分结焦反应过程实验模拟

 利用自制的热转化生焦实验装置和热重分析仪,考察了反应条件和油浆的性质对油浆重馏分热转化生焦的影响。结果表明，n(H)/n(C)原子比、残炭值、结构族组成等性质对其生焦率的影响要远大于反应时间、反应温度和油浆中催化剂含量等反应条件的影响。油浆中重组分馏分沸点的高低不能有效反映其生焦倾向，而重组分中的沥青质和胶质是生焦的主要前驱物，其芳碳率与生焦率有较好的线性对应关系。改变沉降器的操作条件可以缓解沉降器的结焦程度，但防止结焦的根本途径是通过调节主提升管的反应条件,从而减少进入沉降器内的油气中的结焦前驱物和沥青质的含量。

SIMULATION EXPERIMENTS ON COKE FORMATION OF HEAVY SLURRY FRACTION IN RFCC DISENGAGER

Effects of reaction conditions and properties of slurry on the coke formation in the thermal conversion process of slurry were studied by a self-designed thermal reaction experiment apparatus and TG analysis. The experimental results showed that the properties of slurry, such as the atomic ratio of n(H)/n(C), carbon residue (CR) and structure group composition, affected the coke formation more greatly than the reaction conditions, such as reaction time, reaction temperature and catalyst content in slurry. The boiling point of heavy slurry fraction does not determine effectively the coke formation tendency in resid fluid catalytic cracking (RFCC) disengager, while resin and asphaltene in slurry are the main precursors of coke, in which the ratio of aromatic carbon has a good linear relationship with the coke formation. Optimizing reaction condition in RFCC disengager can relieve the coke formation in some extent, but the key to prevent the coking in disengager is to reduce the content of precursor in slurry by adjusting the operating condition of the riser.