The impact of low-load operation in atmospheric and vacuum distillation units on heat exchange equipment
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This post was last edited by Niu Honghong on 2020-4-21 at 11:57. Colleagues, what impacts does low-load operation of the atmospheric and vacuum distillation unit have on the pre-distillation cooling equipment? Recently, there were tube bank leaks in the reduced-pressure/pre-dehydration crude oil and normal-pressure/pre-dehydration crude oil streams, but only a few tubes were affected, and no significant corrosion was observed on the surface of the tube banks. Anyone with relevant information or insights would be appreciated. Thank you.
The flow rate of the medium is slower, right? ⊙ω⊙ Everything that is prone to scaling will accumulate scale, which accelerates corrosion; you know what I mean
Low load leads to: flow deviation, salt deposition, and increased scaling, as well as changes in the dew point location; as a result, corrosion and leaks can occur in unexpected areas
The consequences of increased drift, salt deposition, and scaling, as well as changes in the dew point position, lead to severe corrosion beneath the scale and low-temperature dew point corrosion.
Operation at low load results in uneven flow rates, as well as uneven distribution of the liquid within the tube bundle; this leads to significant variations in the temperature difference of the equipment, causing it to experience large fluctuations in temperature over time. Leaks occur then.
Low load leads to: increased deviation of flow, salt deposition, and scaling, as well as changes in the dew point location; as a result, corrosion and leaks can occur in unexpected locations. That makes sense
The low load is mainly caused by flow deviation, which results in uneven flow rates of the various crude oil streams; other factors should not have any impact.