What is the principle behind thermal siphon?
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In petroleum refining and chemical processing units, many bottom heat sources are provided by reboilers, and their operation is based on the principle of thermosiphon effect. So what exactly is thermosiphon? What conditions are required for the establishment of thermal siphon effect?
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A thermosyphon reboiler relies on the hydrostatic head of the liquid in the bottom of the tower, as well as the density difference between the two-phase flow within the reboiler, to generate a driving force that induces thermosyphonic motion. Thermosyphon reboilers utilize the density difference between the gas-liquid mixture in the reboiler and the liquid at the bottom of the tower as a driving force to increase the flow velocity of the fluid within the tubes, thereby reducing fouling and enhancing the heat transfer coefficient. These devices are compact and require little space; they can be divided into vertical thermosyphon reboilers and horizontal thermosyphon reboilers. In general, in vertical thermosyphon systems, the process fluid flows through the tube side, while the heating steam flows through the shell side ； The evaporation side of the horizontal thermosyphon reboiler is not restricted; the flow path can be selected based on process requirements, such as the amount of evaporation and the susceptibility to scaling. The installation height of a horizontal thermosyphonic reboiler is lower than that of a vertical one; it has a greater circulation driving force and a larger circulation volume as well.
What was said upstairs was excellent; I learned a lot from it as well. Thank you
It was well explained; if possible, it would be even better to compare it with a kettle-type reboiler as well.
The density difference is used to allow the liquid to flow by itself, turning it into steam; the density of the liquid is greater than that of the vapor-liquid mixture, and this cycle repeats
I took a look at the explanations provided by LS, and found that it’s quite similar to the natural circulation evaporator I built. Thermal siphonning is a circulation process in which a pressure difference resulting from the density difference caused by temperature differences acts as the driving force, right?
I’ve studied it; I happened to encounter this issue here, regarding its installation elevation
It’s based on the principle that density varies with temperature; when the density is lower, a siphoning effect occurs.