A fuzzy control method against flue gas disturbance for chemical adsorption post-combustion carbon dioxide capture system
A chemical adsorption and fuzzy control technology, applied in general control systems, adaptive control, control/regulation systems, etc., can solve the problem of limited disturbance suppression, can not solve multi-variable, coupled, nonlinear systems, cannot overcome the stability and Rapidity and other issues, to achieve the effect of suppressing flue gas disturbance, improving adaptability, and satisfying fast tracking
Active Publication Date: 2022-04-26
SOUTHEAST UNIV
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Problems solved by technology
At present, 90% of thermal control strategies are based on PID control, but PID controllers cannot solve multivariable, coupled, nonlinear systems, and traditional PID parameters are fixed, which cannot overcome the corresponding stability and rapidity of objects. Therefore, it is necessary to design a control method that can adaptively adjust PID parameters and quickly suppress flue gas flow disturbances.
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[0034] Such as figure 1 As shown, a CO 2 The anti-flue gas disturbance fuzzy control method of the capture system comprises the following steps:
[0035] (1) According to figure 2 The CO after chemisorption combustion is shown 2 Process flow chart of the capture system, select lean liquid flow and extraction steam flow as input, carbon capture rate and reboiler temperature as output, and identify the transfer function model G(s) of the object according to the experimental data;
[0036] (2) Select the lean liquid flow rate u 1 CO control 2 Capture rate y 1 , extraction steam flow u 2 Control reboiler temperature y 2 , the flue gas flow d is the measurable disturbance, and the feedforward compensation decoupling matrix D(s) is calculated.
[0037]
[0038](3) Adjust the PID parameters. Under the condition of satisfying the input constraints, design a fuzzy PI controller for the lean liquid-trapping rate loop, and adaptively adjust the controller gain K p , integrat...
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The invention discloses a method for chemisorption and combustion of CO 2 The anti-flue gas disturbance fuzzy control method of the capture system, model identification is carried out through experimental data, and a multivariable system with lean liquid flow rate and extraction steam flow rate as input and capture rate and reboiler temperature as output is constructed. Carry out feed-forward compensation decoupling to realize two single-loop control of lean liquid flow to carbon capture rate and extraction flow to reboiler temperature. The present invention introduces a fuzzy controller on the basis of traditional PI control, and adjusts PI parameters online, so that the controlled object can quickly track CO 2 Capture rate: Aiming at the measurable disturbance of the flue gas flow rate, a variable gain proportional controller is designed according to the relative changes of the flue gas flow rate and the lean liquid and extraction steam flow rates under different capture rate conditions. In this case, the anti-flue gas disturbance capability of the system can be improved.
Description
technical field [0001] The invention relates to the technical field of thermal automatic control, in particular to a CO 2 Anti-flue gas disturbance fuzzy control method for capture system. Background technique [0002] As the impact of the greenhouse effect on the environment becomes increasingly prominent, reducing CO 2 The dominant greenhouse gases are particularly important. my country is a big coal-consuming country. Although the country vigorously develops new energy sources, it cannot change the pattern of power generation using coal as energy in a short time. Power plant flue gas contains a large amount of CO 2 , therefore, it is of great practical significance to study how to reduce the carbon emissions of coal-fired units. Post-combustion CO based on ethanolamine solution (MEA) chemisorption 2 Capturing technology (PCC) is currently the most promising technology for large-scale application because it can transform existing power plants and has a relatively low ...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 吴啸席涵李益国沈炯
Owner SOUTHEAST UNIV