CN-121979163-A - Sequential decoupling type multi-carbon capture synergistic flexible regulation and control method and system

CN121979163ACN 121979163 ACN121979163 ACN 121979163ACN-121979163-A

Abstract

The invention relates to the technical field of low-carbon energy system control, in particular to a time sequence decoupling type multi-carbon trapping collaborative flexible regulation and control method and a time sequence decoupling type multi-carbon trapping collaborative flexible regulation and control system, wherein the method comprises the steps of constructing a modularized direct air trapping dynamic load model in a time sequence decoupling mode, and realizing real-time response reducible characteristics in an adsorption stage and batch constraint translatable characteristics in a regeneration stage; the method comprises the steps of constructing a continuous flexible adjustable load model of a regeneration tower based on a post-combustion carbon capture solvent storage decoupling technology, constructing a multi-stage cooperative control strategy based on green electricity energy supply gradient, constructing a dynamic priority order for direct air capture and post-combustion carbon capture, constructing a full-cycle cooperative optimization model of a system taking carbon assets into account with the aim of minimizing system net cost parameters, and solving a global operation strategy of modularized direct air capture and post-combustion carbon capture. The invention effectively solves the problem of how to convert the carbon capturing process into flexible load which can be flexibly regulated and realize the cooperative optimization with green electricity.

Inventors

WANG CHONG
YANG RUI
JIN YUQING
CAO YANG

Assignees

河海大学

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. The time sequence decoupling type multi-carbon trapping synergistic flexible regulation and control method is characterized by comprising the following steps of: A modularized direct air trapping dynamic load model is constructed in a time sequence decoupling mode, so that real-time response in an adsorption stage can be realized, and characteristics can be reduced, and batch constraint in a regeneration stage can be translated; Constructing a continuous flexible adjustable load model of the regeneration tower based on a post-combustion carbon capture solvent storage decoupling technology, wherein the adjustment of the regeneration tower is constrained by the liquid level state of a solvent storage tank; Establishing a multi-stage cooperative control strategy based on green electricity energy supply gradient, and constructing a dynamic priority order for the direct air trapping and the carbon trapping after combustion; and aiming at minimizing the system net cost parameter, establishing a system full-period collaborative optimization model considering the carbon asset, and solving the overall operation strategy of modularized direct air trapping and carbon trapping after combustion.
2. The time-series decoupling multi-carbon capture collaborative flexible regulation method according to claim 1, wherein constructing a dynamic load model of modular direct air capture comprises: dividing the modularized direct air capture into an adsorption stage and a regeneration stage which are independent of each other; Establishing a nonlinear fan power model for the adsorption stage, and allowing real-time load reduction by interrupting fan operation; and establishing a state transition model controlled by the saturation threshold of the adsorbent for the regeneration stage, wherein the state transition model is configured to translate the load.
3. The time-series decoupling type multi-carbon capture collaborative flexible regulation and control method according to claim 2, wherein constructing a continuous flexible adjustable load model of a regeneration tower comprises: Defining the storage decoupling of the carbon-trapped solvent after combustion as the rigid load of the absorption tower and the flexible load of the regeneration tower; Establishing a linear regulation relation between the power of the regeneration tower and the rich liquid flow; Setting a dynamic equation of the liquid level of the solvent storage tank and a capacity constraint thereof.
4. The time-series decoupling multi-carbon capture collaborative flexible regulation method of claim 3, wherein constructing a dynamic priority order comprises: the first priority guarantees the continuous operation of the rigid load of the absorption tower; the second priority is to forcedly start the flexible load of the regeneration tower at the limit of the liquid level of the storage tank; The third priority distributes green electricity allowance to the direct air capturing regeneration stage or regeneration tower to accelerate; And starting the direct air capturing and adsorbing stage fan according to the fourth priority.
5. The time-series decoupled multi-carbon capture collaborative flexible tuning method according to claim 4, wherein the direct air capture adsorption phase is preferentially performed until adsorbent saturation when green electricity meets the forced regeneration buffer demand but is less than regeneration phase power.
6. The time-series decoupling multi-carbon capture collaborative flexible regulation method according to claim 3, wherein the solvent storage tank level dynamic equation comprises: ; Wherein, the The flow rate of the rich liquid fed into the regeneration tower is an adjustable control variable; the liquid storage volume of the rich liquid tank; a liquid storage volume for the lean liquid tank; In order to absorb the flow rate of the rich liquid flowing out of the tower, In discrete time steps.
7. The time-series decoupled multi-carbon capture collaborative flexible tuning method according to claim 1, wherein the system net cost parameters include: The power supply cost calculated by the real-time power price parameter and the purchase power parameter of the power grid; a device loss parameter associated with a number of device start-stops and a length of time of operation; And calculating the carbon asset technical benefit value obtained through the carbon capture amount and the grid carbon emission factor.
8. The time-series decoupled multi-carbon capture collaborative flexible regulation method of claim 7, wherein the computational model of carbon asset benefits comprises: ; Wherein, the Benefits for carbon assets; Is of carbon valence; And The capture amounts of PCC and DAC, respectively; The power is the network purchasing electric power; And (3) the real-time carbon emission factor of the power grid, and T is the carbon asset profit accounting period.
9. A time-series decoupled multi-carbon capture synergistic flexible regulation and control system, characterized in that the system comprises: The dynamic load module is used for constructing a modularized direct air trapping dynamic load model in a time sequence decoupling mode, so that real-time response in an adsorption stage can be realized, and characteristics and batch constraint translatable characteristics in a regeneration stage can be reduced; the flexible adjusting module is used for constructing a continuous flexible adjustable load model of the regeneration tower based on a post-combustion carbon capture solvent storage decoupling technology, wherein the adjustment of the regeneration tower is constrained by the liquid level state of the solvent storage tank; The priority ordering module establishes a multi-stage cooperative control strategy based on green electricity energy supply gradient, and builds a dynamic priority order for direct air trapping and carbon trapping after combustion; and the strategy generation module is used for establishing a system full-period collaborative optimization model considering the carbon asset with the aim of minimizing the system net cost parameter, and solving a global operation strategy of modularized direct air trapping and post-combustion carbon trapping.
10. The time series decoupled multi-carbon capture collaborative flexible regulation system of claim 9, wherein the dynamic load module comprises: the stage independent unit is used for dividing the modularized direct air capture into an adsorption stage and a regeneration stage which are independent from each other; The load reduction unit establishes a nonlinear fan power model for the adsorption stage, and allows real-time load reduction by interrupting the fan operation; and the translation load unit establishes a state transition model controlled by the saturation threshold of the adsorbent for the regeneration stage and is configured to translate load.

Description

Sequential decoupling type multi-carbon capture synergistic flexible regulation and control method and system Technical Field The invention relates to the technical field of low-carbon energy system control, in particular to a time sequence decoupling type multi-carbon capture synergistic flexible regulation and control method and system. Background To achieve the "two carbon" goal, carbon capture utilization and sequestration techniques become a critical path. There are two main types of carbon capture technologies at present, namely, carbon capture after combustion (PCC) technology mainly aims at high-concentration emission sources (such as power plant flue gas), carbon dioxide is separated by chemical solvents, and Direct Air Capture (DAC) technology directly captures low-concentration carbon dioxide from the atmosphere. The two types of technologies face two major systematic bottlenecks in practical application, namely, the DAC technology has extremely high unit trapping energy consumption due to the fact that a large amount of ambient air needs to be treated. The existing scheme requires continuous operation of equipment to ensure trapping efficiency, if traditional high-carbon-emission electric power driving is adopted, the full life cycle carbon removal benefit is greatly reduced and even negative emission reduction effect can be possibly generated, and secondly, a rigid load characteristic exists in an operation mode of strong coupling of a conventional PCC system and an industrial process, in order to match continuous operation requirements of a power plant, the PCC system must keep synchronous operation of an absorption tower and a regeneration tower, so that the PCC system becomes an uninterruptible rigid load, and the rigid operation characteristic causes that the system cannot respond to the output characteristic of fluctuating renewable energy sources, so that intermittent green electricity resources are difficult to be consumed, and the load cannot be actively reduced when green electricity is insufficient. The technical contradiction is that the high energy consumption characteristic of the DAC is required to be operated together with green electricity to realize the net emission reduction value, and the rigid load characteristic of the PCC limits the flexible adjustment capability of the whole system. The prior art does not solve the problem of flexible transformation of carbon capture load, and is difficult to realize space-time matching of carbon capture resources and renewable wave energy sources. The information disclosed in this background section is only for enhancement of understanding of the general background of the disclosure and is not to be taken as an admission or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art. Disclosure of Invention The invention provides a time sequence decoupling type multi-carbon capture synergistic flexible regulation and control method and a time sequence decoupling type multi-carbon capture synergistic flexible regulation and control system, which can effectively solve the problems in the background technology. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A sequential decoupling type multi-carbon capture synergistic flexible regulation and control method, comprising: A modularized direct air trapping dynamic load model is constructed in a time sequence decoupling mode, so that real-time response in an adsorption stage can be realized, and characteristics can be reduced, and batch constraint in a regeneration stage can be translated; Constructing a continuous flexible adjustable load model of the regeneration tower based on a post-combustion carbon capture solvent storage decoupling technology, wherein the adjustment of the regeneration tower is constrained by the liquid level state of a solvent storage tank; Establishing a multi-stage cooperative control strategy based on green electricity energy supply gradient, and constructing a dynamic priority order for the direct air trapping and the carbon trapping after combustion; and aiming at minimizing the system net cost parameter, establishing a system full-period collaborative optimization model considering the carbon asset, and solving the overall operation strategy of modularized direct air trapping and carbon trapping after combustion. Further, constructing a dynamic load model of modular direct air capture, comprising: dividing the modularized direct air capture into an adsorption stage and a regeneration stage which are independent of each other; Establishing a nonlinear fan power model for the adsorption stage, and allowing real-time load reduction by interrupting fan operation; and establishing a state transition model controlled by the saturation threshold of the adsorbent for the regeneration stage, wherein the state transition model is configured to translate the load. Furth