重油催化裂化沉降器内油浆汽化率的研究

RESEARCH ON VAPORIZATION RATES OF SLURRY IN RFCC DISENGAGER

采用基团贡献法和石油馏分气液平衡理论建立了油浆汽化率计算方法,对重油催化裂化装置在工业操作条件下沉降器内油浆的汽化率进行预测,并考察了油气温度和油浆分压对泡点、露点及油浆汽化率的影响。结果表明:在油浆分压一定时,随着油气温度的升高,油浆汽化率逐渐升高;当温度一定时,随着油浆分压的降低,油浆的泡点和露点均逐渐降低,而油浆汽化率逐渐增大。依据最小二乘法原理,计算得到油浆汽化率关联模型,可以预测不同油气温度和油浆分压下的油浆汽化率,为确定工业操作条件下沉降器内冷凝重组分的数量提供了简易的数学模型。

The method to calculate the vaporization rate of slurry was developed by the group contri- bution method based on the vapor-liquid equilibrium theory and used to predict the vaporization rates of slurry in the industrial RFCC disengager. The effect of oil vapor temperature and partial pressure of slurry on the bubble point, dew point temperature and vaporization rates of slurry were investigated. Results show that at constant slurry partial pressure the vaporization rate ascend with increasing tem- perature of the oil vapor. Besides, when the temperature is constant, the bubble point and the dew point decline with slurry partial pressure reduction, while the vaporization rates of the slurry go up. Accord- ing to the least square method, the correlation of the slurry vaporization rates and operation conditions was established for predicting the vaporization rate of the slurry under different operating conditions. It can provide a simple mathematical model to determine the condensate amount in the disengager.