The vaporization ratios of the slurry at various temperature and partial pressure were calculated with the group-contribution method,and then the phase state of the slurry in the residue fluid catalytic cracking(RFCC)...The vaporization ratios of the slurry at various temperature and partial pressure were calculated with the group-contribution method,and then the phase state of the slurry in the residue fluid catalytic cracking(RFCC) disengager was determined.This research could provide some advices on how to select the technological conditions to decrease the coking in the RFCC disengager.The oil gas temperature and the slurry partial pressure had signifi- cant effects on the vaporization ratio of the slurry.Increasing the oil gas temperature and reducing the slurry partial pressure could effectively slow down the coking speed in the RFCC disengager.According to the calculation results, a correlation was established to predict the vaporization ratio of the slurry under different operating conditions.展开更多
In the paper, an estimating method for critical properties in group-contribution method is presented.For eliminating the influence of adjacent group and distinguishing isomers, the new method including first-level gro...In the paper, an estimating method for critical properties in group-contribution method is presented.For eliminating the influence of adjacent group and distinguishing isomers, the new method including first-level group-contribution method and second-level group-contribution method is proposed. The new method demonstrates significant improvement in accuracy.展开更多
以van der Walls-Platteeuw模型为基础,采用划分基团贡献的思想利用UNIFAC法和Aasberg-Petersen模型分别计算十二烷基硫酸钠(SDS)中不同基团对水的活度系数贡献值,建立了SDS体系下甲烷水合物生成条件预测模型。经实验验证,预测最大误差...以van der Walls-Platteeuw模型为基础,采用划分基团贡献的思想利用UNIFAC法和Aasberg-Petersen模型分别计算十二烷基硫酸钠(SDS)中不同基团对水的活度系数贡献值,建立了SDS体系下甲烷水合物生成条件预测模型。经实验验证,预测最大误差不超过5%,平均误差在3%以内,改进后的模型良好的可靠性可为水合物动力学研究提供准确的相平衡数据。通过模型计算,发现相对比纯水,SDS会影响水的活度明显改善水合物生成条件。当浓度在0.001 5 mol/L时效果最好,超过0.002 mol/L时,反而会提高水合物生成条件抑制水合物生成。展开更多
基金Supported by the National-Natural Science Foundation of China （No.20406013） and Program for New Century Excellent Talents in University （No.NCET-04-0107）.
文摘The vaporization ratios of the slurry at various temperature and partial pressure were calculated with the group-contribution method,and then the phase state of the slurry in the residue fluid catalytic cracking(RFCC) disengager was determined.This research could provide some advices on how to select the technological conditions to decrease the coking in the RFCC disengager.The oil gas temperature and the slurry partial pressure had signifi- cant effects on the vaporization ratio of the slurry.Increasing the oil gas temperature and reducing the slurry partial pressure could effectively slow down the coking speed in the RFCC disengager.According to the calculation results, a correlation was established to predict the vaporization ratio of the slurry under different operating conditions.
基金Supported by Tianjin Natural Scientific Foundation(No.973602911).
文摘In the paper, an estimating method for critical properties in group-contribution method is presented.For eliminating the influence of adjacent group and distinguishing isomers, the new method including first-level group-contribution method and second-level group-contribution method is proposed. The new method demonstrates significant improvement in accuracy.
