[Objective] This work focuses on the emission control of volatile organic amine solvents carried in the decarbonization tail gas of coal -fired power plants. 

[Methods] A steady-state and dynamic model of Aspen Plus water washing tower using desalinated water as the washing solvent was developed to control the volatile organic amines contained in the decarbonization tail gas of chemical absorption carbon dioxide capture p rocess. In the steady-state process, a thermodynamic model of the water washing tower was established and the internal structure of the water washing tower was determined. The optimal operating parameters for controlling volatile organic compounds emissions in the water washing tower were obtained through sensitivity analysis. The dynamic response process under disturbance was obtained from the dynamic control model. 

[Results] The simulation results show that the removal rate of VOCs from the tail gas of the water washing tower is 99.41%. The modeling results show that 2 when the number of washing tower plates is 16 and the amount of desalinated water is 1.5 t/h, the concentration of volatile organic compounds can be reduced from 4 377 mg/m3 before washing to 25.85 mg/m3, which meets the national emission standards. The sensitivity analysis results indicate that the theoretical number of trays in the water washing tower is more sensitive to the concentration of volatile organic compounds emissions than the amou nt of desalinated water used. The hydraulic calculation results show that the maximum flooding factor is 55.8%, and the maximum limit value of the washing tower system is 32.03%, which proves the reliability of the washing tower equipment design. The equipment design and dynamic control simulation results of the water washing tower indicate that under disturbances in feed flow rate and composition, the emission concentration of volatile organic compounds at the gas phase outlet of the water washing tower do es not exceed ± 5% of the pre disturbance level, and the emission concentration of volatile organic compounds under all disturbances is less than 30mg/m3, indicating that the water washing tower can effectively control VOCs under both steady -state and dyna mic conditions. 

[Conclusion]The effectiveness of the water washing process proposed in this article for controlling volatile organic compounds in decarbonization tail gas of carbon dioxide capture process has been verified. The research results of this work can provide technical support for achieving standard emissions of volatile organic compounds in carbon dioxide capture processes. The control of volatile organic compounds in decarbonized exhaust gas will become an essential component of advanced carbon capture technology systems.