Coal-fired power plant deep peak regulation system coupled with carbon dioxide capture

Abstract

The invention provides a coal-fired power plant deep peak shaving system coupled with carbon dioxide capture. The coal-fired power plant deep peak shaving system comprises a thermal power system, an energy storage module, a carbon dioxide capture system and a control system. Wherein the control system is used for adjusting the output power of the thermal power system, the energy storage action and the release action of the energy storage module and the consumption power of the carbon dioxide capture system so as to balance the peak regulation electricity price income and the internet access income of the thermal power system and the carbon emission reduction income of the carbon dioxide capture system; and the sum of the peak regulation electricity price income, the internet surfing income and the carbon emission reduction income reaches the maximum value. According to the coal-fired power plant deep peak regulation system coupled with carbon dioxide capture, the thermal power system achieves absorption of the deep peak regulation load and the load in the negative electricity price period through the carbon dioxide capture system, and meanwhile benefit maximization is achieved while peak regulation is conducted.

Description

Technical Field

[0001] This disclosure relates to the field of power plant peak shaving technology, and in particular to a deep peak shaving system for coal-fired power plants coupled with carbon dioxide capture. Background Technology

[0002] The construction of new power systems has profoundly impacted grid operation and traditional thermal power plant operation models. Particularly during peak daytime solar power generation periods, the demand for system peak shaving surges, forcing thermal power units to engage in deep peak shaving. During periods of wind and solar power curtailment, they even face the risk of negative electricity prices. Therefore, how to achieve deep peak shaving and absorb loads with negative electricity prices is a pressing issue that coal-fired power plants need to address. Summary of the Invention

[0003] This disclosure aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, the purpose of this disclosure is to provide a deep peak shaving system for coal-fired power plants coupled with carbon dioxide capture.

[0005] To achieve the above objectives, this disclosure provides a deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture, comprising: a thermal power system, an energy storage module, a carbon dioxide capture system, and a control system; wherein, the energy input terminal of the energy storage module is connected to the energy output terminal of the thermal power system, and the energy output terminal of the energy storage module is connected to the energy input terminal of the carbon dioxide capture system; the energy storage module is used to store the output energy of the thermal power system and release the stored energy to the carbon dioxide capture system; the control system is used to adjust the output power of the thermal power system, the energy storage and release actions of the energy storage module, and the power consumption of the carbon dioxide capture system, so as to balance the peak-shaving electricity price revenue and grid connection revenue of the thermal power system and the carbon emission reduction revenue of the carbon dioxide capture system, thereby maximizing the sum of the peak-shaving electricity price revenue, the grid connection revenue, and the carbon emission reduction revenue.

[0006] Optionally, the deep peak shaving system further includes: a distribution module, wherein the energy input terminal of the distribution module is connected to the energy output terminal of the thermal power system, and the first energy output terminal of the distribution module is connected to the energy input terminal of the energy storage module, and the second energy output terminal of the distribution module and the energy output terminal of the energy storage module are respectively connected to the energy input terminal of the carbon dioxide capture system; wherein, the control system is used to adjust the energy distribution ratio between the first energy output terminal and the second energy output terminal of the distribution module.

[0007] Optionally, the energy storage module includes an electrical storage unit, and the distribution module includes an electrical distribution unit; wherein the electrical input terminal of the electrical distribution unit is connected to the electrical output terminal of the thermal power system, and the first electrical output terminal of the electrical distribution unit is connected to the electrical input terminal of the electrical storage unit, and the second electrical output terminal of the electrical distribution unit and the electrical output terminal of the electrical storage unit are respectively connected to the electrical input terminal of the carbon dioxide capture system; the control system is used to adjust the electrical distribution ratio between the first electrical output terminal and the second electrical output terminal of the electrical distribution unit.

[0008] Optionally, the energy storage module includes a thermal storage unit, and the distribution module includes a thermal distribution unit; wherein the thermal energy input terminal of the thermal distribution unit is connected to the thermal energy output terminal of the heating system, and the first thermal energy output terminal of the thermal distribution unit is connected to the thermal energy input terminal of the thermal storage unit, and the second thermal energy output terminal of the thermal distribution unit and the thermal energy output terminal of the thermal storage unit are respectively connected to the thermal energy input terminal of the carbon dioxide capture system; the control system is used to adjust the thermal energy distribution ratio between the first thermal energy output terminal and the second thermal energy output terminal of the thermal distribution unit.

[0009] Optionally, the control system is used to obtain the peak-shaving electricity price revenue of the thermal power system based on the actual peak-shaving volume, real-time deep peak-shaving demand, and peak-shaving service price; wherein, the peak-shaving electricity price revenue of the thermal power system is: min(Qac,Dpe)×Rpe, where Qac is the actual peak-shaving volume, Dpe is the real-time deep peak-shaving demand, and Rpe is the peak-shaving service price.

[0010] Optionally, the control system is used to obtain the actual peak-shaving amount based on the power plant's reference generating power and the actual grid output power; wherein, the actual peak-shaving amount Qac is: Pba-Pgr, where Pba is the power plant's reference generating power and Pgr is the actual grid output power.

[0011] Optionally, the control system is used to obtain the grid connection revenue based on the actual grid output power and the real-time grid connection price; wherein, the grid connection revenue is: Pgr×Epr, where Pgr is the actual grid output power and Epr is the real-time grid connection price.

[0012] Optionally, the control system is used to obtain the actual grid output power based on the output power of the thermal power system and the power consumed by the carbon dioxide capture system; wherein, the actual grid output power Pgr is: Pge-Pcc, where Pge is the output power of the thermal power system and Pcc is the power consumed by the carbon dioxide capture system.

[0013] Optionally, the control system is used to obtain the carbon emission reduction benefit based on the carbon dioxide capture volume and carbon price of the carbon dioxide capture system; wherein, the carbon emission reduction benefit is: Eca×Cca, where Eca is the carbon dioxide capture volume of the carbon dioxide capture system and Cca is the carbon price.

[0014] The technical solution provided in this disclosure may include the following beneficial effects: Because the energy input end of the energy storage module is connected to the energy output end of the thermal power system, and the energy output end of the energy storage module is connected to the energy input end of the carbon dioxide capture system, the thermal power system can stably supply energy to the carbon dioxide capture system by utilizing the energy storage and release actions of the energy storage module. This allows the carbon dioxide capture system to absorb deep peak loads and loads during periods of negative electricity prices, while also ensuring the efficient operation of the carbon dioxide capture system. Furthermore, the control system adjusts the output power of the thermal power system, the energy storage and release actions of the energy storage module, and the power consumption of the carbon dioxide capture system to balance the peak-shaving electricity price revenue and grid connection revenue of the thermal power system with the carbon emission reduction revenue of the carbon dioxide capture system. This maximizes the sum of peak-shaving electricity price revenue, grid connection revenue, and carbon emission reduction revenue, thereby maximizing revenue while shaving peak loads.

[0015] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the structure of a deep peak-shaving system for a coal-fired power plant coupled with carbon dioxide capture, as proposed in one embodiment of this disclosure; As shown in the figure: 1. Thermal power system; 2. Energy storage module; 21. Electrical storage unit; 22. Thermal storage unit; 3. Distribution module; 31. Electrical distribution unit; 32. Thermal distribution unit; 4. Carbon dioxide capture system; 5. Control system. Detailed Implementation

[0017] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0018] like Figure 1 As shown in the embodiments of this disclosure, a deep peak-shaving system for a coal-fired power plant coupled with carbon dioxide capture is proposed, comprising: a thermal power system 1, an energy storage module 2, a carbon dioxide capture system 4, and a control system 5. The energy input terminal of the energy storage module 2 is connected to the energy output terminal of the thermal power system 1, and the energy output terminal of the energy storage module 2 is connected to the energy input terminal of the carbon dioxide capture system 4. The energy storage module 2 is used to store the output energy of the thermal power system 1 and release the stored energy to the carbon dioxide capture system 4. The control system 5 is used to regulate the output power of the thermal power system 1, the energy storage and release actions of the energy storage module 2, and the power consumption of the carbon dioxide capture system 4, so as to balance the peak-shaving electricity price revenue and grid connection revenue of the thermal power system 1 and the carbon emission reduction revenue of the carbon dioxide capture system 4, thereby maximizing the sum of the peak-shaving electricity price revenue, grid connection revenue, and carbon emission reduction revenue.

[0019] Understandably, since the energy input end of the energy storage module 2 is connected to the energy output end of the thermal power system 1, and the energy output end of the energy storage module 2 is connected to the energy input end of the carbon dioxide capture system 4, the thermal power system 1 can stably supply energy to the carbon dioxide capture system 4 by utilizing the energy storage and release actions of the energy storage module 2. This allows the carbon dioxide capture system 4 to absorb deep peak loads and loads during periods of negative electricity prices, while also ensuring the efficient operation of the carbon dioxide capture system 4.

[0020] Moreover, the control system 5 adjusts the output power of the thermal power system 1, the energy storage and release actions of the energy storage module 2, and the power consumption of the carbon dioxide capture system 4 to balance the peak-shaving electricity price revenue and grid connection revenue of the thermal power system 1 and the carbon emission reduction revenue of the carbon dioxide capture system 4, thereby maximizing the sum of peak-shaving electricity price revenue, grid connection revenue and carbon emission reduction revenue, thus maximizing revenue while shaving peaks.

[0021] In summary, the deep peak shaving system, based on the characteristics of the new electricity market and the deep peak shaving needs of thermal power system 1, combined with energy storage technology, effectively improves the deep peak shaving capacity of the unit. The electricity generated after deep peak shaving can be used as excess profit without recovery of the portion of revenue. The energy originally used for power generation is converted into the heat and electricity required to drive the carbon dioxide capture and storage (CCUS) system, realizing the transformation from "power generation loss" to "low-cost operation of CCUS".

[0022] It should be noted that the energy consumption of the chemical absorption method (CCUS) mainly comes from the heat energy required for the absorbent to desorb carbon dioxide and the electricity consumption required for the operation of the carbon dioxide capture system 4. Under the current carbon trading market, the cost of carbon capture is difficult to cover by the benefits brought by carbon emission reduction and carbon trading. Therefore, by balancing the benefits while balancing peak shaving, it is possible to further improve the benefits of carbon trading. Specifically, the carbon dioxide capture system 4 absorbs the deep peak shaving load and negative electricity price period load of the thermal power system 1 for the capture, desorption, and compression of carbon dioxide. The specific type of the carbon dioxide capture system 4 can be set according to actual needs and is not limited thereto. For example, the carbon dioxide capture system 4 includes: a water scrubbing tower, an absorption tower, a regeneration tower, a gas-liquid separator, and a reboiler.

[0023] Thermal power system 1 is used to generate electricity using coal. The specific type of thermal power system 1 can be set according to actual needs and there are no restrictions. For example, thermal power system 1 includes: boiler, high-pressure cylinder, medium-pressure cylinder, low-pressure cylinder, generator, condenser, deaerator, etc.

[0024] Energy storage module 2 is used for energy storage. Thermal power system 1 provides stable energy to carbon dioxide capture system 4. The specific type of energy storage module 2 can be set according to actual needs and there are no restrictions on it.

[0025] like Figure 1 As shown, in some embodiments, the deep peak-shaving system further includes: a distribution module 3, the energy input terminal of the distribution module 3 being connected to the energy output terminal of the thermal power system 1, and the first energy output terminal of the distribution module 3 being connected to the energy input terminal of the energy storage module 2, and the second energy output terminal of the distribution module 3 and the energy output terminal of the energy storage module 2 being respectively connected to the energy input terminal of the carbon dioxide capture system 4. The control system 5 is used to adjust the energy distribution ratio between the first and second energy output terminals of the distribution module 3.

[0026] It is understandable that, since the energy input end of the distribution module 3 is connected to the energy output end of the thermal power system 1, and the first energy output end of the distribution module 3 is connected to the energy input end of the energy storage module 2, and the second energy output end of the distribution module 3 and the energy output end of the energy storage module 2 are respectively connected to the energy input end of the carbon dioxide capture system 4, the energy of the thermal power system 1 can be rationally delivered to the carbon dioxide capture system 4 and the energy storage module 2 under the distribution of the distribution module 3. For example, when the energy delivered by the thermal power system 1 is more than the energy required for the operation of the carbon dioxide capture system 4, the excess energy is delivered to the energy storage module 2 for storage. When the energy delivered by the thermal power system 1 is less than the energy required for the operation of the carbon dioxide capture system 4, the thermal power system 1 and the energy storage module 2 jointly deliver energy to the carbon dioxide capture system 4.

[0027] It should be noted that the distribution module 3 is used to transmit the energy of the thermal power system 1 to the carbon dioxide capture system 4 and / or the energy storage module 2.

[0028] like Figure 1 As shown, in some embodiments, the energy storage module 2 includes an electrical storage unit 21, and the distribution module 3 includes an electrical distribution unit 31. The electrical input terminal of the electrical distribution unit 31 is connected to the electrical output terminal of the thermal power system 1, and the first electrical output terminal of the electrical distribution unit 31 is connected to the electrical input terminal of the electrical storage unit 21. The second electrical output terminal of the electrical distribution unit 31 and the electrical output terminal of the electrical storage unit 21 are respectively connected to the electrical input terminals of the carbon dioxide capture system 4. The control system 5 is used to adjust the electrical distribution ratio between the first and second electrical output terminals of the electrical distribution unit 31.

[0029] Understandably, since the power input terminal of the power distribution unit 31 is connected to the power output terminal of the thermal power system 1, and the first power output terminal of the power distribution unit 31 is connected to the power input terminal of the power storage unit 21, and the second power output terminal of the power distribution unit 31 and the power output terminal of the power storage unit 21 are respectively connected to the power input terminal of the carbon dioxide capture system 4, the power of the thermal power system 1 can be stably delivered to the carbon dioxide capture system 4 by utilizing the distribution of the power distribution unit 31 and the energy storage of the power storage unit 21, thereby achieving efficient operation of the carbon dioxide capture system 4 while performing deep peak shaving.

[0030] It should be noted that the electrical storage unit 21 is used to store excess electrical energy of the thermal power system 1. The specific type of the electrical storage unit 21 can be set according to actual needs and there is no restriction. For example, the electrical storage unit 21 can be multiple batteries connected in series and / or in parallel.

[0031] The power distribution unit 31 is used to distribute electrical energy. The specific type of the power distribution unit 31 can be set according to actual needs and there is no restriction. For example, the power distribution unit 31 can be an integrated module based on electronic switches (MOS, etc.), power controllers and other devices.

[0032] For example, when the electrical energy delivered by the thermal power system 1 is more than the electrical energy required for the operation of the carbon dioxide capture system 4, the excess electrical energy is delivered to the energy storage unit 21 for energy storage. When the electrical energy delivered by the thermal power system 1 is less than the electrical energy required for the operation of the carbon dioxide capture system 4, the thermal power system 1 and the energy storage unit 21 jointly deliver electrical energy to the carbon dioxide capture system 4.

[0033] Among them, the power output terminal of the thermal power system 1 can be the generator's outlet bus, while the power input terminal of the carbon dioxide capture system 4 can be the system's power supply bus.

[0034] like Figure 1As shown, in some embodiments, the energy storage module 2 includes a thermal storage unit 22, and the distribution module 3 includes a thermal distribution unit 32. The thermal input terminal of the thermal distribution unit 32 is connected to the thermal output terminal of the heating system, and the first thermal output terminal of the thermal distribution unit 32 is connected to the thermal input terminal of the thermal storage unit 22. The second thermal output terminal of the thermal distribution unit 32 and the thermal output terminal of the thermal storage unit 22 are respectively connected to the thermal input terminal of the carbon dioxide capture system 4. The control system 5 is used to adjust the thermal distribution ratio between the first and second thermal output terminals of the thermal distribution unit 32.

[0035] It is understandable that, since the heat energy input end of the heat distribution unit 32 is connected to the heat energy output end of the heating system, and the first heat energy output end of the heat distribution unit 32 is connected to the heat energy input end of the heat storage unit 22, and the second heat energy output end of the heat distribution unit 32 and the heat energy output end of the heat storage unit 22 are respectively connected to the heat energy input end of the carbon dioxide capture system 4, the heat energy of the heating system can be stably transported to the carbon dioxide capture system 4 by utilizing the distribution of the heat distribution unit 32 and the energy storage of the heat storage unit 22, thereby achieving efficient operation of the carbon dioxide capture system 4 while achieving deep peak shaving.

[0036] It should be noted that the thermal storage unit 22 is used to store excess thermal energy of the thermal system. The specific type of thermal storage unit 22 can be set according to actual needs and there is no limitation. For example, the thermal storage unit 22 can be a molten salt energy storage device, a thermal storage boiler, etc.

[0037] The heat distribution unit 32 is used to distribute heat energy. The specific type of the heat distribution unit 32 can be set according to actual needs and there is no restriction. For example, the heat distribution unit 32 can be an integrated module based on valve groups such as reversing valves and pressure reducing valves.

[0038] For example, when the heat energy delivered by the thermal system is more than the heat energy required for the operation of the carbon dioxide capture system 4, the excess heat energy is delivered to the heat storage unit 22 for energy storage. When the heat energy delivered by the thermal system is less than the heat energy required for the operation of the carbon dioxide capture system 4, the thermal system and the heat storage unit 22 jointly deliver heat energy to the carbon dioxide capture system 4.

[0039] Among them, the heat output end of the heating system can be a bypass flue, main steam pipeline, auxiliary steam header, etc. (steam is used as the heating medium), while the heat input end of the carbon dioxide capture system 4 can be a reboiler.

[0040] Based on this, according to the actual peak-shaving needs of the power plant and the unit's operating conditions, the thermal system converts the deep peak-shaving load and the load during periods of negative electricity prices into thermal and electrical energy output. Under the control of the control system 5, the electrical storage unit 21 and the thermal storage unit 22 absorb the deep peak-shaving load and the load during periods of negative electricity prices, while simultaneously providing stable energy for the carbon dioxide capture system 4. Furthermore, under the action of the electrical distribution unit 31 and the thermal distribution unit 32, some of the thermal and electrical energy is used to maintain the operation of the carbon dioxide capture system 4, while the remaining thermal and electrical energy enters the electrical storage unit 21 and the thermal storage unit 22 for energy storage, respectively.

[0041] In some embodiments, the control system 5 is used to obtain the peak-shaving electricity price revenue of the thermal power system 1 based on the actual peak-shaving volume, real-time deep peak-shaving demand, and peak-shaving service price. The peak-shaving electricity price revenue of the thermal power system 1 is: min(Qac,Dpe)×Rpe, where Qac is the actual peak-shaving volume, Dpe is the real-time deep peak-shaving demand (in MW), and Rpe is the peak-shaving service price (in yuan / MWh).

[0042] It is understandable that the peak-shaving electricity price revenue = min(Qac,Dpe)×Rpe. By using the actual peak-shaving volume, real-time deep peak-shaving demand, and peak-shaving service price, the peak-shaving electricity price revenue can be accurately calculated.

[0043] It should be noted that the peak-shaving electricity price revenue of thermal power system 1 is calculated based on the actual peak-shaving volume Qac and the peak-shaving service price Rpe, but is limited by the peak-shaving demand Dpe. That is, the revenue is only for the actual peak-shaving volume provided and can not exceed the peak-shaving demand.

[0044] In some embodiments, the control system 5 is used to obtain the actual peak-shaving amount based on the power plant's baseline generating power and the actual grid output power. The actual peak-shaving amount Qac is: Pba - Pgr, where Pba is the power plant's baseline generating power in MW, and Pgr is the actual grid output power.

[0045] It is understandable that Qac=Pba-Pgr. By using the power plant's benchmark generating power and the actual grid output power, the actual peak-shaving amount can be accurately calculated, and then the peak-shaving electricity price revenue can be accurately calculated based on the actual peak-shaving amount.

[0046] It should be noted that the actual peak shaving amount is the actual reduction in grid output power by the power plant relative to the baseline power.

[0047] Qac≥0 indicates that the power plant actually reduced its output to meet peak shaving requirements; if Qac<0, it indicates that the power plant's output exceeded the baseline, but deep peak shaving usually requires a reduction in output, so we assume Qac≥0 here.

[0048] In some embodiments, the control system 5 is used to obtain grid connection revenue based on the actual grid output power and the real-time grid connection price. The grid connection revenue is calculated as: Pgr × Epr, where Pgr is the actual grid output power and Epr is the real-time grid connection price, expressed in yuan / MWh.

[0049] It is understandable that the grid connection revenue = Pgr × Epr, and the grid connection revenue can be accurately calculated using the actual grid output power and the real-time grid connection price.

[0050] In some embodiments, the control system 5 is used to obtain the actual grid output power based on the output power of the thermal power system 1 and the power consumed by the carbon dioxide capture system 4. The actual grid output power Pgr is defined as: Pge - Pcc, where Pge is the output power of the thermal power system 1 in MW, and Pcc is the power consumed by the carbon dioxide capture system 4 in MW.

[0051] It is understandable that Pgr = Pge - Pcc. By using the output power of thermal power system 1 and the power consumed by carbon dioxide capture system 4, the actual grid output power can be accurately calculated, and then the peak-shaving electricity price revenue and grid connection revenue can be accurately calculated using the actual grid output power.

[0052] It should be noted that since the energy storage module 2 does not supply energy to the grid, the actual grid output power is only the output of the thermal power system 1 minus the power consumption of the carbon dioxide capture system 4.

[0053] In some embodiments, the control system 5 is used to obtain carbon emission reduction benefits based on the carbon dioxide capture volume of the carbon dioxide capture system 4 and the carbon price. The carbon emission reduction benefits are calculated as: Eca × Cca, where Eca is the carbon dioxide capture volume of the carbon dioxide capture system 4 in tons per hour, and Cca is the carbon price in yuan per ton.

[0054] It is understandable that carbon emission reduction benefit = Eca × Cca. By using the carbon dioxide capture volume of carbon dioxide capture system 4 and the carbon price, the carbon emission reduction benefit can be accurately calculated.

[0055] It should be noted that the total revenue = peak-shaving electricity price revenue + grid connection revenue + carbon emission reduction revenue.

[0056] To maximize total revenue, control system 5 uses optimization algorithms (such as model predictive control) to dynamically adjust Pge, energy storage operation, and Pcc to balance peak-shaving electricity price revenue, grid connection revenue, and carbon emission reduction revenue.

[0057] For example, when peak demand is high, reduce Pge or increase Pcc to improve Qac; when grid connection price is high, prioritize Pgr. This part of the calculation can be controlled in conjunction with the dispatch load forecast and the unit operation control system.

[0058] Specifically, the control system 5 acquires real-time deep peak-shaving demand of the thermal power system 1, real-time grid-connected electricity price, actual power generation operation status, energy storage status of the energy storage module 2, and operation status of the carbon dioxide capture system 4; and, based on the above data, calculates in real-time the power plant's peak-shaving electricity price revenue, grid-connected revenue, carbon emission reduction revenue, and load absorption status. When the peak-shaving and grid-connected revenue reach the expected values, the system adjusts the output of the heat output terminal and the electricity output terminal to achieve deep peak-shaving and negative electricity price load absorption, so as to meet the actual needs of the generator unit and obtain the maximum revenue.

[0059] The energy output from the thermal energy output terminal and the electrical energy output terminal, under the control of the control system 5, regulates the energy input of the thermal storage unit 22, the electrical storage unit 21 and the carbon dioxide capture system 4 through the thermal distribution unit 32 and the electrical distribution unit 31, so as to meet the actual needs of carbon emission reduction.

[0060] It should be noted that in the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0061] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture, characterized in that, include: Thermal power systems, energy storage modules, carbon dioxide capture systems, and control systems; The energy input terminal of the energy storage module is connected to the energy output terminal of the thermal power system, and the energy output terminal of the energy storage module is connected to the energy input terminal of the carbon dioxide capture system. The energy storage module is used to store the output energy of the thermal power system and to release the stored energy to the carbon dioxide capture system. The control system is used to adjust the output power of the thermal power system, the energy storage and release actions of the energy storage module, and the power consumption of the carbon dioxide capture system, so as to balance the peak-shaving electricity price revenue and grid connection revenue of the thermal power system and the carbon emission reduction revenue of the carbon dioxide capture system, thereby maximizing the sum of the peak-shaving electricity price revenue, the grid connection revenue, and the carbon emission reduction revenue.

2. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 1, characterized in that, The deep peak-shaving system also includes: The distribution module has its energy input terminal connected to the energy output terminal of the thermal power system, and its first energy output terminal is connected to the energy input terminal of the energy storage module. The second energy output terminal of the distribution module and the energy output terminal of the energy storage module are respectively connected to the energy input terminal of the carbon dioxide capture system. The control system is used to adjust the energy distribution ratio between the first energy output terminal and the second energy output terminal of the distribution module.

3. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 2, characterized in that, The energy storage module includes an electrical storage unit, and the distribution module includes an electrical distribution unit. The power input terminal of the power distribution unit is connected to the power output terminal of the thermal power system, and the first power output terminal of the power distribution unit is connected to the power input terminal of the power storage unit. The second power output terminal of the power distribution unit and the power output terminal of the power storage unit are respectively connected to the power input terminal of the carbon dioxide capture system. The control system is used to adjust the power distribution ratio between the first power output terminal and the second power output terminal of the power distribution unit.

4. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 2, characterized in that, The energy storage module includes a thermal storage unit, and the distribution module includes a thermal distribution unit. The heat energy input terminal of the heat distribution unit is connected to the heat energy output terminal of the heating system, and the first heat energy output terminal of the heat distribution unit is connected to the heat energy input terminal of the heat storage unit. The second heat energy output terminal of the heat distribution unit and the heat energy output terminal of the heat storage unit are respectively connected to the heat energy input terminal of the carbon dioxide capture system. The control system is used to adjust the heat energy distribution ratio between the first heat energy output terminal and the second heat energy output terminal of the heat distribution unit.

5. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 1, characterized in that, The control system is used to obtain the peak-shaving electricity price revenue of the thermal power system based on the actual peak-shaving volume, real-time deep peak-shaving demand and peak-shaving service price. The peak-shaving electricity price revenue of the thermal power system is: min(Qac,Dpe)×Rpe, where Qac is the actual peak-shaving amount, Dpe is the real-time deep peak-shaving demand, and Rpe is the peak-shaving service price.

6. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 5, characterized in that, The control system is used to obtain the actual peak shaving amount based on the power plant's benchmark generating power and the actual grid output power. Wherein, the actual peak shaving amount Qac is: Pba-Pgr, where Pba is the power plant's base generating power and Pgr is the actual grid output power.

7. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 1, characterized in that, The control system is used to obtain the grid connection revenue based on the actual grid output power and the real-time grid connection price. The revenue from grid connection is calculated as: Pgr × Epr, where Pgr is the actual grid output power and Epr is the real-time grid connection price.

8. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 6 or 7, characterized in that, The control system is used to obtain the actual grid output power based on the output power of the thermal power system and the power consumed by the carbon dioxide capture system. Wherein, the actual grid output power Pgr is: Pge-Pcc, where Pge is the output power of the thermal power system and Pcc is the power consumed by the carbon dioxide capture system.

9. The deep peak-shaving system for coal-fired power plants coupled with carbon dioxide capture according to claim 1, characterized in that, The control system is used to obtain the carbon emission reduction benefits based on the carbon dioxide capture volume and carbon price of the carbon dioxide capture system. The carbon emission reduction benefit is Eca × Cca, where Eca is the amount of carbon dioxide captured by the carbon dioxide capture system and Cca is the carbon price.

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