Adjustment of feedstock feeding rate in delayed coking
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In our unit, the feed oil enters the distillation tower via two routes; which route can increase the temperature drawn by the bottom circulation pump? The temperature in the evaporation section is generally controlled using the pressure of the feed at the top, while the feed at the bottom is regulated by adjusting the liquid level and temperature at the bottom of the tower. How to adjust it? Seeking advice from experts
The feed from the upper section has had its excess heat removed; adjustments are mainly made via the lower section
The upper feed removes superheat from the oil and gas, transferring the heat to the circulating oil at the bottom of the tower. Increase the feed rate to raise the bottom temperature of the tower
First, it is necessary to understand the functions of upper and lower feed. The function of the upper feed is to remove excess heat and wash the coke powder; an even more important secondary role is to regulate the load on the upper and lower parts of the tower, as well as the liquid level and temperature at the bottom of the tower. This role is quite significant. The specific amounts and distribution ratios of these two types of feed should be adjusted according to the specifications of the distillation tower.