Hydrocracking stripping tower
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I would like to ask: when the amount of stripping steam used in a hydrocracking stripper is reduced, how does the temperature at the bottom of the tower change, and what is the reason for this? Thank you.
In a stripping tower, superheated steam is blown in at the bottom of the tower to reduce the partial pressure of the oil and gas, thereby stripping out substances such as hydrogen sulfide, ammonia, water, and light hydrocarbons from the hydrogenated oil and improving the quality of the refined oil. In the stripping tower, a certain amount of superheated steam is introduced to reduce the vapor pressure of the oil and gas inside the tower, causing some of the light components carried along to evaporate and return to the distillation section. Due to the limited heat provided by the superheated steam, the heat required for the evaporation of light components is mainly obtained from the decrease in the temperature of the stream itself; therefore, the temperature inside the tower drops gradually below the feed section rather than rising.
This post was last edited by linger11 on 2016-3-11 10:23. So, if the amount of product extracted from the top of the tower is kept constant, will the temperature at the bottom of the tower decrease or increase when the amount of stripping steam used is reduced?
Within a certain range, reducing the amount of superheated steam will cause the bottom temperature of the tower to increase slightly
In my opinion, one should not consider only the decrease in steam pressure; if other factors change as well, the temperature at the bottom of the tower may also change, or if the composition of the feed changes. How has the backflow changed? Has the production volume changed? That’s why. When everything remains unchanged, only the stripping steam changes. Then the temperature at the bottom of the tower must be reduced. Because it is the heat from gas vapor that provides the heat. Lowering the partial pressure of oil and gas results in hydrogen sulfide being released from the gas.
The temperature should be reduced, as the stripping steam is usually medium-pressure steam at a temperature of 380 degrees. By reducing the amount of steam, the temperature at the bottom of the stripping tower drops, and less light fraction is vaporized.