How to increase the flow rate of the medium in the pipeline
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I read in the information on coking units that, in order to increase the flow rate of the feed oil, it is necessary to introduce water or steam into the feed oil, thereby increasing its flow rate and preventing coking in the heating furnace. Why does introducing water or steam enable an increase in the flow rate? What principle? I’m not quite sure; those who know, please share. Thanks
Water or water vapor added to the crude oil serves two main functions: 1. Interference with shear forces: As a shear medium, water or water vapor creates numerous tiny oil-water interfaces when mixed into the crude oil; these new interfaces increase the shear effects within the crude oil. This shear effect can increase the average flow velocity of the fluid; therefore, by introducing water or steam into the crude oil, the flow velocity of the fluid can be effectively increased. 2. Thermal expansion effect: The water or water vapor added to the crude oil expands when heated, and the resulting increase in volume drives the movement of the crude oil, thereby increasing its flow rate. This method can not only increase the flow rate but also reduce the temperature inside the furnace and the viscosity of the oil, thereby reducing the formation of sludge in the furnace tubes and preventing coking in them. .
Whether the flow rate increases with temperature and other fluids being heated – only by increasing the flow rate can the velocity be increased; this is for reference only.
With high pressure and a large amount of fluid inside the pipe, the flow rate increases, doesn’t it?