The issue of dry point in catalytic cracking gasoline
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What is the impact of the opening degree of the diesel upper distillation outlet in the catalytic cracking fractionation tower on the dry point of gasoline? Why?
A low upper distillation cut for diesel in the fractionation tower is beneficial for regulating the quality of gasoline, as it improves the separation efficiency of the trays above the diesel distillation outlet
This post was last edited by bingfeng1203 on 2009-9-4 18:48. The opening is large, so the gas-liquid contact on the tray is not very good. Refractory components tend to be carried to the top of the tower. Gasoline has a high proportion of heavy components and a high dry point. With a small opening degree, less diesel is extracted; there is more liquid phase on the tray, allowing for efficient gas-liquid mass and heat transfer, thereby enabling the heavier components to be washed away. Gasoline is lighter! Do some menial work. The opening degree of the diesel overhead outlet has a relatively small impact on the dry point of gasoline! After all, the separation between diesel and gasoline is controlled by the top reflux!
1. The top circulation volume must be increased to ensure heat balance within the tower. 2. Low diesel yield and high distillation efficiency.
The degree of opening of the diesel extraction port affects the amount of internal recirculation; when internal recirculation is high, the heavier components are pushed downward, while otherwise they are pushed upward.
An excessive opening can lead to an increase in the volatilization of heavier components, thereby raising the dry point. A high dry point temperature means it is difficult to ensure that gasoline evaporates and burns completely under operating conditions, which results in increased carbon buildup in the cylinders and higher fuel consumption.
I agree with what was said on floor 5: the size of the opening in the extraction port directly affects the level of internal recirculation. A smaller opening results in greater internal recirculation and a lower dry point.
I agree that the view on the 5th floor does have some influence
I’ve learned that the opening degree shouldn’t be too large