Leakage in the heat extraction tubes of the external heat extractor
Thread Content
I read in a book that there are several reasons for leaks in the heat extraction tubes of external heat exchangers; two of these reasons are not easy to understand and I’m not sure about them. One is the increase in the concentration of the dilute-phase catalyst in the regenerator, and the other is the rise in pressure drop in the cyclone separator of the regenerator This raises another question: does a high gas flow rate result in a high pressure drop in the regenerator cyclone separator?
External heat leakage causes pressure fluctuations in the regenerator; the density balance between the dense and lean phases is disrupted, the dense phase moves upward, the density of the lean phase increases, and the flow rate at the inlet of the centrifuge increases, resulting in a greater pressure drop across the centrifuge.
Does the dense phase rise when there are pressure fluctuations?
The evenly distributed main air from the main air distribution ducts ensures proper coking and fluidization of the catalyst. When the external heat extraction tubes leak, large amounts of steam enter the regenerator irregularly, disrupting normal fluidization and causing fluctuations in the bed layer; some of the catalyst is carried into the dilute phase. With pressure control remaining unchanged, this leads to an increase in the concentration at the inlet of the cyclone, an increase in the inlet flow rate, and a rise in pressure drop. For example, when increasing the processing capacity, the pressure drop in the settler and centrifuge increases significantly, right?