Method for controlling amine solvent regeneration system

Abstract

The invention provides a method for controlling an amine solvent regeneration system, belongs to the technical field of amine solvent recovery, and comprises an amine recovery tower. The method is characterized in that a heat supply regulating valve of a tower bottom reboiler is related to system pressure; and a distilled line regulating valve of a tower top product is related to the gas-phase temperature of the tower top. The method can meet the requirement on purification degree of an amine solvent product on the tower bottom only by presetting a system pressure value and a tower top gas-phase temperature vale; and the control system can trace variations of feeding flow rate, feeding quality and feeding temperature to realize automatic regulation and obtain perfect tower bottom products.

Description

technical field [0001] The invention belongs to the technical field of amine solvent recovery, and in particular relates to a control method for an amine solvent regeneration system. Background technique [0002] The thermal regeneration process usually used for amine solvents that have absorbed acid gas is to adjust the heat supply of the reboiler according to the change of the temperature of the reboiler at the bottom of the column; the control valve on the overhead distillation line is used to control the system pressure. Since the liquid state at the bottom of the amine solvent heat regeneration tower is similar to the bubble point of water, the fluid temperature of the reboiler returning to the tower is similar to the liquid phase temperature at the bottom of the tower, so it is difficult to automatically adjust the heat supply of the reboiler according to the temperature change; when the amine The reboiler heat supply cannot be automatically correlated with the require...

AI Technical Summary

Problems solved by technology

Since the liquid phase state at the bottom of the amine solvent heat regeneration tower is similar to the bubble point of water, the temperature of the fluid returning to the tower from the reboiler is similar to the liquid phase temperature at the bottom of the tower, so it is difficult to automatically adjust the heat supply of the reboiler according to the temperature change; when the amine The reboiler heat supply cannot be automatically correlated with the required heat when the solvent-like feed properties and temperature change

The overhead distillation line is opened and closed according to the preset system pressure of the regulating valve to release the acid gas of the product, and it is not automatically related to the quality of the purified amine solvent product at the bottom of the tower. When the heat supply is insufficient, the system pressure is lower than the set When the pressure is discharged, it will cause the accumulation of acid gas in the system and affect the purification degree of the bottom amine solvent products