What phase is the medium that returns from the reboiler to the regeneration tower?

The medium that returns from the reboiler to the regeneration tower is liquid amine. The phase state of the amine in the return line to the tower can be gas-liquid two-phase, depending on the bubbles generated by heating in the reboiler and the heat that needs to be transferred. Generally, the gas-liquid ratio of the amine solution depends on factors such as the heating intensity in the reboiler, the liquid flow rate, the reducing gas flow rate, and the design structure of the tower. Some studies indicate that in a reboiler, if the residence time of the gas-liquid phase is short, there is relatively more amine solution ； Otherwise, the gas phase occupies a larger proportion. Specifically, the more the reboiler is heated, the more the liquid phase within it is heated into a gas phase; as the gas rises, its ability to carry away heat also increases. The amine solution is continuously fed into the reduction tower, and therefore needs to be transported in liquid form through the return line. However, heating at high temperatures and the heat carried away by gases can cause the amine solution to evaporate into a gaseous state, until it reaches the constant temperature point in the reboiler, where it turns back into a liquid state. Therefore, the gas-liquid ratio in the return pipeline is a dynamic process that is influenced by various factors. .

The overall pressure and temperature distributions in the regeneration tower should be roughly similar, and the liquid level control range at the bottom of the tower is also about the same; therefore, the flow rates of the material in the pipes leading to and from the reboiler should not differ significantly. Although the temperature control methods used in reboilers vary from one plant to another, to what extent can such differences affect the fluid flowing in the pipes returning to the tower?/

Your view is correct. The overall pressure and temperature distributions in the regenerator are essentially the same, and the liquid level control range at the bottom of the tower is also similar; therefore, the flow rates of the material in the pipes entering and leaving the reboiler should not differ much. The temperature control of the reboiler may vary from one plant to another, but its impact is relatively small; it usually only affects physical properties such as the temperature and phase state of the material in the return line to the tower. Generally, the purpose of heating with a reboiler is to volatilize bicarbonate ions and sulfate ions, or other impurities, from the amine solution, and to use high temperatures and low pressures to drive them into the gas phase and remove them from the system. During this process, factors such as heating and cooling within the reboiler And the equilibrium between the gas and liquid phases can cause certain fluctuations in the fluid output from the reboiler. However, since the material transfer between various units within the entire regeneration unit occurs step by step, and there are corresponding material processing times and liquid level limits in each unit, it is possible to keep the flow rate of the material in the return line relatively stable, thereby having a minimal impact on the entire production process. .