摘要
减粘装置为了取得较佳的经济效益应该在高苛刻度下操作,但苛刻度受到加热炉结垢和产品安定性的限制。这两种限制都来自焦炭的生成,减粘进料可用从生焦动力学导出的生焦倾向来表征。可根据生焦倾向和过程苛刻度来计算生焦量,从而可使减粘装置长期在最大允许苛刻度下操作。用简单的试验室减粘装置可测定生焦倾向,对混合渣油、波斯坎原油和阿拉伯重质渣油测得的生焦倾向依次为2.1×10^(-3)、4.2×10^(-3)和7.3×10^(-3),与减粘的工业经验很吻合。生焦倾向与进科的沥青质含量成正比,并间接与粘度相关;但与进料的康氏残炭含量或密度无关。
A visbreaker should be operated at high severity for better process economics, but the severity is limited by heater fouling and product stability.Both of these limitations are due to coke formation.Visbreaking feed can be characterized by its coking propensity, which is derived from the kinetics of coke formation. Coke formation can be calculated from the coking propensity and the process severity, so that the process may be controlled at the maximum severity permissible at all times. Coking propensity can be determined with a simple laboratory visbreakero The eoking propensities are found to be 2.1×10^(-3), 4,2×10^(-3) and 7.3×10^(-3) m%/s for mixed residue,Boscan crude and Arab heavy residue respectively, and are in good agreement with commercial visbreaking experiences.Coking propensity is directly proportional to the asphaltene content of the feed.It is also indirectly related to the viscosity,but not to the Conradsonc arbon residue (CCR) content or the density (API gravity)of the feed.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1991年第1期9-13,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
