Selection of circulation pump flow rate for tower/reactor bottom

1. What determines the flow rate of the bottom circulation pump? Such as the bottom circulation pump of a distillation tower? The bottom circulation pump of the extraction tower? Answer: There are generally two types of bottom circulation pumps in distillation towers: one type is used to supply heat to the bottom of the tower. The flow rate of such pumps is determined based on the amount of heat required at the bottom of the tower, as well as the temperature difference between the inlet and outlet of the circulating material and the vaporization rate at the outlet. The second type is to prevent the deposition of particulate material at the bottom of the tower, with the circulation rate determined based on the type of material deposition. 2. Some batch reactors also have circulation pumps at the bottom, which are used for external circulation heat exchange to improve the reaction yield. Then, what determines the flow rate of these circulation pumps? The flow rate of this type of pump is determined based on the conversion rate of the reaction and the ratio of recycled material to fresh feed, in other words, it is determined according to the requirements of the reaction, such as controlling the reaction rate and the final conversion rate

Based on the heat load required at the tower bottom, the circulation temperature difference, the pipe flow velocity, and the residence time at the tower bottom.