The impact of poor performance of the distillation column top cooler on operating conditions
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What are the effects of poor performance of the distillation tower top cooler on operational conditions?
As the pressure in the pressure column increases, the loss of light components in the atmospheric column increases.
Tower pressure will be difficult to control, and the components cannot cool down. The light components move downward.
The most obvious effect is an increase in column pressure; the light components at the top of the column fail to condense, resulting in a loss of the distillate from that section. If the bottom of the column contains an aqueous phase or if the operating temperature is close to the boiling point, cavitation can occur in the pump at the bottom of the column. In the case of an intermediate column, this leads to increased load on the subsequent columns, ultimately resulting in products from the final distillation unit that do not meet the required standards
Will this situation cause cavitation in the tower top reflux pump?
I need to correct the spelling mistakes; I’ve misled people before due to wrong spellings, haha
I’ve never encountered this situation. Personally, I think it depends on the temperature at the bottom of the tower; if there is a large difference in the boiling points of the materials at the top and bottom, cavitation is less likely to occur. If those temperatures are similar, then the possibility of cavitation is quite high
{:3_47:} To maintain the original separation efficiency, an increase in the amount of material inside the tower leads to a decrease in the tower’s processing capacity, as well as an increase in energy consumption. Additionally, the pressure and temperature differences at both ends of the tower increase. As for cavitation, I’ve never encountered it; just imagine what kind of conditions that would entail. (You can check your pump parameters and those of the material to determine the saturated vapor pressure of the material at that temperature, as well as the pump’s cavitation margin. If the backpressure minus the saturated vapor pressure is greater than this cavitation margin, then cavitation will occur.) If the reflux flow at the top of the tower isn’t sufficient, then the distribution of heavier components will shift towards the top of the tower, causing the overall temperature curve of the tower to rise, and the components at the top of the tower will become less pure.