Overall scheduling and predicting control system and method for large coal fired power plant CO2 capture

A coal-fired power station, predictive control technology, applied in the direction of general control system, control/regulation system, adaptive control, etc., can solve the problems of large heat consumption, reduce the power generation of thermal power units, affect the thermal efficiency of the unit, etc., to solve the problem of large delay , Improve the effect of dynamic adjustment quality

Active Publication Date: 2020-02-07
JIANGSU FRONTIER ELECTRIC TECH +1
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  • Abstract
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Problems solved by technology

At the same time, the CO after combustion 2 The solvent regeneration of the capture system consumes a lot of heat, which is provided by steam extraction from the steam turbine of the thermal power unit, and steam extraction from the steam turbine will reduce the power generation of the thermal power unit and affect the thermal efficiency of the unit

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  • Overall scheduling and predicting control system and method for large coal fired power plant CO2 capture
  • Overall scheduling and predicting control system and method for large coal fired power plant CO2 capture
  • Overall scheduling and predicting control system and method for large coal fired power plant CO2 capture

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Embodiment Construction

[0058] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0059] Such as figure 1 Shown, a kind of large-scale coal-fired power station CO of the present invention 2 Capture the overall scheduling and predictive control system, including optimization solution module, neural network steady-state model, model predictive controller, first delay module, second delay module, state observer and large coal-fired power station CO 2 capture the overall system model;

[0060] The optimization solution module has three inputs, which are the current on-grid electricity price C electricit , the current moment CO 2 Emissions price C CO2 and the main steam pressure constraint penalty term Penalty, the output of which is the optimal controlled variable u at the current moment * ;

[0061] The input of the neural network steady-state model is the optimal controlled variable u at the current moment * , the outpu...

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Abstract

The invention discloses an overall scheduling and predicting control system and method for large coal fired power plant CO2 capture. The method comprises steps of selecting a main control variable anda controlled variable of a model according to a running characteristic of the overall system of coal fired power plant CO2 capture; and first, considering constraints like feed-in tariff, CO2 emission price, main vapor temperature and so on, establishing economic performance indicators for the overall system of coal fired power plant CO2 capture, calculating the most economic target value under the current condition, and then building a model prediction controller based on a status space so as to track the optimal target value. The method not only makes the overall system of the coal fired power plant CO2 capture most economic but also can handle the long delay characteristic of the CO2 capture system effectively, thereby improving dynamic adjusting quality of the output side and enablingthe control system to meet industrial site requirements.

Description

technical field [0001] The invention belongs to the technical field of regulation and control of coal-fired power stations, and in particular relates to a large-scale coal-fired power station CO 2 Integral scheduling and predictive control systems and methods are captured. Background technique [0002] Coal-fired thermal power units are the current CO 2 and other major sources of greenhouse gas emissions, in-depth research on CO emissions from thermal power units 2 Capture technology is an important means to reduce greenhouse gas emissions and control ambient temperature. Post-combustion CO based on chemisorption 2 capture technology due to its high efficiency in absorbing CO 2 , does not change the advantages of the existing thermal power units, is the current CO 2 The mainstream technology of capture. [0003] Coal-fired thermal power units and post-combustion CO 2 The capture system has a strong coupling effect. Due to the limitations of new energy sources such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 孙栓柱廖霈之李逗孙彬李春岩高进沈洋潘苗杨晨琛吴啸
Owner JIANGSU FRONTIER ELECTRIC TECH
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