Intermittent distillation: how to deal with clogged cooling coil tubes
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This post was last edited by liaifeng on 2018-9-3 at 18:20. The oil washing and processing unit uses circulating water for cooling; the water temperature is 42°C, while the temperature at the top of the distillation tower is around 270°C! How to solve it
It doesn’t explain clearly what’s going on – it’s about clearing things out.
I work with physical circulation water treatment methods that can reduce hardness and conductivity, as well as dissolve scale on the inner walls of heat exchangers. I’m not sure if this can be of any help to you.
Is it the CW that’s blocked, or is it the oil filter that’s clogged? If the CW filter gets clogged, it’s because your water quality control is inadequate; if the oil washing filter gets clogged, it’s probably due to too low temperatures after cooling, which causes the material to condense.
This post was last edited by luoli519 on 2017-5-6 at 17:34. The blockage of the process medium in the cooling coil of the distillation column in the oil washing intermittent processing project is mainly caused by the light fraction vapor at the top of the distillation column carrying droplets of heavier oil from within the column into the cooler. When these heavier oils are cooled, they solidify and wax up, adhering to the walls of the cooler and thus blocking the cooling tubes as well as the process pipelines. The solution must be comprehensive. Firstly, it is necessary to install an efficient, highly adaptable, and excellent in terms of anti-clogging performance vane-type gas-liquid demisting separator element inside the distillation column, at the inlet of the light-phase steam extraction pipe on the inner side of the column. This element is used to remove the heavy oil droplets carried by the extracted light-phase steam, thereby preventing such heavy oil from escaping from the column along with the light-phase steam. At the same time, pay attention to controlling the lower operating temperature of the distillation column system to prevent the heavy oil inside the column from vaporizing due to high temperatures and entering the condenser as steam, where it will solidify and block the tubes. Generally, it is not recommended to increase the inlet and outlet temperatures of the circulating water in order to reduce the solidification and clogging of heavy oil within the condenser; this approach is not only ineffective, but an increase in the circulating water temperature also reduces the efficiency of condensing and liquefying light oil vapor, resulting in a lower yield of light oil. For more technical information on high-efficiency vane-type gas-liquid separators, please visit http://bbs.hcbbs.com/thread-1354814-1-1.html.