A low-energy-consumption phase change CO2 capture-methanol co-production process system for flue gas from thermal power plants

By using non-aqueous phase change absorbents and improved model predictive control algorithms, combined with heat pump waste heat recovery and AI intelligent regulation, the problems of high energy consumption in CO2 capture and regeneration of flue gas in thermal power plants and poor economic efficiency in carbon resource utilization have been solved. This has enabled the high-value utilization of carbon resources and the stable and efficient operation of the system, adapting to the characteristics of large flow rates and wide operating conditions in thermal power plants.

CN121944759BActive Publication Date: 2026-07-03GUIZHOU INST OF COAL SCI +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUIZHOU INST OF COAL SCI
Filing Date
2026-03-27
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing flue gas CO2 capture technologies for thermal power plants suffer from problems such as high regeneration energy consumption, low CO2 load capacity, poor economic efficiency in carbon resource utilization, and difficulty in controlling carbon capture-methanol cogeneration systems, making it difficult to adapt to the characteristics of large flow rates and wide operating condition fluctuations in thermal power plants.

Method used

A process system deeply coupled with CO2 capture and methanol synthesis is constructed by using a non-aqueous phase change absorbent and an improved model predictive control algorithm. Energy self-balancing is achieved through waste heat recovery via heat pumps, and system parameters and process are optimized by combining an AI intelligent control unit.

Benefits of technology

It significantly reduces CO2 capture and regeneration energy consumption, enhances the high-value utilization of carbon resources, improves the robustness and control accuracy of the system, ensures stable and efficient operation over a wide range of operating conditions, and improves the economics and feasibility of the CCUS project.

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Abstract

The present application relates to the technical field of flue gas carbon capture and resource utilization of thermal power plants, and discloses a low-energy-consumption phase change CO2 capture-methanol co-production process system for flue gas of a thermal power plant, comprising: a CO2 absorption unit, which makes a non-aqueous phase change absorbent absorb CO2 in flue gas of the thermal power plant to form rich absorption liquid; a liquid-liquid phase separation unit, which spontaneously separates the rich absorption liquid into lean liquid phase and rich liquid phase, and returns the lean liquid phase to the CO2 absorption unit; a rich liquid regeneration unit, which heats and regenerates the rich liquid phase to resolve CO2 gas; a CO2 catalytic synthesis methanol unit, which synthesizes methanol from the CO2 gas and external rich hydrogen gas; a heat pump waste heat recovery unit, which recovers heat generated in the methanol synthesis reaction, upgrades the heat, and supplies the upgraded heat to the rich liquid regeneration unit; and an AI intelligent regulation and control unit, which collects process parameters of each unit, and performs collaborative optimization control on actuators of each unit based on an improved model predictive control algorithm. Thus, the energy consumption of the carbon capture process is greatly reduced, and the carbon resources are used in a high-value way.
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