Post-combustion carbon capture mixing control system and method

Through a hybrid control system that combines distributed and centralized control modules, the stability and energy consumption problems of post-combustion carbon capture control in existing technologies are solved, efficient and stable carbon capture effects are achieved, and the robustness and flexibility of the system are improved.

CN120827787APending Publication Date: 2025-10-24GREEN SIBO (JINAN) NEW ENERGY TECHNOLOGY CO LTD +1
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Patent Information

Application Number
CN202511217364.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-28
Publication Date
2025-10-24

AI Technical Summary

Technical Problem

Existing post-combustion carbon capture control strategies find it difficult to strike a balance between ensuring high capture rate and low energy consumption, and the disturbance of the desorption tower is transmitted to the absorption tower through the solution circulation, resulting in system instability and decreased efficiency.

Method used

A hybrid control system is adopted, combining distributed and centralized control modules. Through the buffer tank, reboiler heat source regulating valve and ratio control module, local and global optimization control of the lean solution state is achieved, the propagation of desorption tower disturbance is prevented, and the steam supply and flow ratio are optimized through the model predictive controller to ensure system stability and efficient operation.

Benefits of technology

It improves the stability and efficiency of post-combustion carbon capture control, reduces energy consumption, achieves efficient and stable operation under dynamic conditions, and enhances the robustness and flexibility of the system.

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Abstract

The invention provides a post-combustion carbon capture mixed control system and method, the system comprises a post-combustion carbon capture device and a control unit, the post-combustion carbon capture device comprises an absorption tower, a desorption tower, a lean and rich liquid heat exchanger and a reboiler, and the control unit comprises a distributed control module, a centralized control module and a ratio control module; the buffer tank stores and stabilizes the lean solution to enter the absorption tower; the reboiler heat source adjusting valve adjusts the steam supply amount according to the first optimization set value; the distributed control module is used for carrying out local stabilization control on the state of the lean solution in the buffer tank; the centralized control module performs optimization control on the overall performance of the post-combustion carbon capture device according to a pre-established target function to obtain a first optimization set value and a second optimization set value; and the ratio control module adjusts the flow ratio control of the lean solution and the flue gas according to a second optimization set value of the centralized control module, so that the stability of carbon capture control after combustion is improved.
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