On the basis of different crudes and different processing schemes, control temperatures at the outlet of heater coil to atmospheric tower can be obtained by calculation or direct measurement.
By an analysis of the working conditions of the system for methanol rectification with three towers and a computation with computer simulation,it is found that when the reflux ratio of the pressure tower is≥2.5 and that of the atmospheric tower≥2.0,the two towers will then operate steadily;
The corrosion survey for the complex unit during the turnaround finds out the minor corrosion in the primary distillation tower (metallurgy: Q235-B) with a coupon corrosion rate of 0.005 mm/yr, pitting corrosion in atmospheric distillation tower (metallurgy: SUS316L + 16MnR) with erosion at the feed inlet, severe corrosion at the overhead of the stripper with pitting 0.5～1.0 mm deep.
Because of impurities carried in the working medium of the atmospheric distillation tower in the refinery, various corrosions are produced, including low-temperature HC1-H2S-H2O corrosion, sulphur and sulfide corrosion and high-temperature naphthene acid corrosion, of all the naphthene acid corrosion is the most serious.
Simulation and hydraulics calculation of vapor load for every section of atmospheric distillation tower is analyzed. On the basis of ensuring separation effect and processing capacity of the tower, some rules for the trays' design are introduced from the economical view when capacity is improved.
The paper stated that the soft measurement model for the quality of sideline products is established by using multiple neural networks structure to meet variable crude feedings and products of normal pressure tower.
Academic analysis and practical calculation are presented for the strength and stiffness optimization of normal pressure tower based on the optimum design theory. A simple and convenient calculation method is presented.
Taking the molecular sieve material endpoint of a normal pressure tower in a distillation unit as an object of study , assisted variant is determined based on field acquired data and mechanic analysis . A math model is established with RBF neural networks to conduct soft sensing of molecular sieve material endpoint.
The paper mainly introduces the product quality controlling and influencing factors on it in regard to three towers rectifying of methanol,and puts forward the treatment means of negative pressure in normal pressure tower.
By the example of OAO "Krasnodarekoneft'," the changes that occurred in the corrosion state of an atmospheric tower of a primary oil refining section upon a changeover to more corrosive crude oil are examined.
常压塔
atmospheric tower
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