Coal-fired unit low-carbon operation control method and device

Abstract

The invention discloses a coal-fired unit low-carbon operation control method and device. The method comprises the steps that operation parameters of a P2G-P2A-CCUS combined operation model are obtained; wherein the P2G-P2A-CCUS combined operation model comprises a P2G system, a P2A system and a CCUS device; the P2A system is used for receiving hydrogen which is generated by the P2G system and cannot be applied to the CCUS device; on the basis of preset constraints, the operation parameters are substituted into a coal-fired unit low-carbon operation calculation formula, and a coal-fired unit low-carbon operation model is obtained; solving the coal-fired unit low-carbon operation model to obtain a coal-fired unit low-carbon operation result; and controlling the operation of the P2G-P2A-CCUS combined operation model on the basis of the low-carbon operation result of the coal-fired unit. The method can solve the problem that stable matching between P2H generation and the carbon dioxide capture amount in the CCUS system is difficult to realize.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-fired units, and in particular to a low-carbon operation control method and device for a coal-fired unit. Background Art

[0002] P2G-CCUS joint operation technology is a comprehensive low-carbon technology that converts renewable energy electricity into gas fuel and realizes CO2 capture and recycling. This technology uses renewable energy electricity such as wind power and photovoltaics to electrolyze water to produce hydrogen, and combines the captured CO2 to synthesize CH4 in a methanation reaction to achieve the storage and conversion of renewable electricity. Due to the volatility and intermittency of renewable energy, the P2G system is difficult to match the carbon dioxide capture in the CCUS system, affecting the coordination of operation.

[0003] Therefore, a low-carbon operation control strategy for coal-fired units is urgently needed to solve the problem of low operation coordination between the P2G system and the CCUS system. Summary of the invention

[0004] The embodiments of the present invention provide a low-carbon operation control method and device for a coal-fired unit to solve the problem of low operation coordination between a P2G system and a CCUS system.

[0005] In order to solve the above problems, an embodiment of the present invention provides a low-carbon operation control method for a coal-fired unit, comprising:

[0006] Obtaining operating parameters of the P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model includes: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device;

[0007] Based on the preset constraints, the operating parameters are substituted into the low-carbon operation calculation formula of the coal-fired unit to obtain the low-carbon operation model of the coal-fired unit;

[0008] The low-carbon operation model of the coal-fired unit is solved to obtain the low-carbon operation result of the coal-fired unit; wherein the low-carbon operation result of the coal-fired unit includes:

[0009] Based on the low-carbon operation results of the coal-fired unit, the operation of the P2G-P2A-CCUS joint operation model is controlled.

[0010] As an improvement of the above scheme, the P2G-P2A-CCUS joint operation model includes: a P2H device, a PSA device, a methanation device, a synthetic ammonia device, a cogeneration unit, a coal-fired power generation unit, a CCUS device, a waste heat recovery device, an ammonia storage device, a photovoltaic device and a wind turbine;

[0011] The P2H device is used to electrolyze water to generate hydrogen and transmit nitrogen to the methanation device and the synthetic ammonia device;

[0012] The PSA device is used to absorb nitrogen from the air and transmit the nitrogen to the synthetic ammonia device;

[0013] The methanation device is used to generate methane from the received hydrogen and the received carbon dioxide;

[0014] The ammonia synthesis device is used to react the received nitrogen with the received hydrogen to generate ammonia;

[0015] The cogeneration unit is used to burn the received methane to generate electricity, generate first carbon dioxide, and transmit the first carbon dioxide to the CCUS device;

[0016] The coal-fired power generation unit is used to burn coal and received ammonia to generate electricity, generate second carbon dioxide, and transmit the second carbon dioxide to the CCUS device;

[0017] The CCUS device is used to collect the first carbon dioxide and the received second carbon dioxide, and transmit the collected carbon dioxide to the methanation device;

[0018] The waste heat recovery device is used to collect the heat generated by the methanation device and the synthetic ammonia device;

[0019] The ammonia storage device is used to store ammonia produced by the synthetic ammonia device;

[0020] The photovoltaic device is used for photovoltaic power generation, and the wind turbine is used for wind power generation;

[0021] The P2G system includes: a P2H device and a methanation device; the P2A system includes: a P2H device, a synthetic ammonia device and a PSA device.

[0022] As an improvement of the above scheme, the operating parameters include: coal consumption of coal-fired power generating units when burning with ammonia, gas purchase volume of cogeneration units, unit operation and maintenance costs of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, total energy consumption of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, carbon trading costs, unit CO2 storage costs, the quality of CO2 stored in the system, the day-ahead predicted output of photovoltaic and wind power, and the scheduling cycle.

[0023] As an improvement of the above scheme, the preset constraints include: ladder carbon trading mechanism constraints and multi-energy balance constraints;

[0024] The constraints of the tiered carbon trading mechanism include:

[0025]

[0026]

[0027] In the formula, is the carbon quota of the system at time t; e G 、e H They are the carbon quotas for electricity and heat supply units; Provide power and heat to the cogeneration unit at time t; is the power generation capacity of the coal-fired power generation device at time t; is the CO2 produced by the system at time t; e coal , are the carbon emission intensity of coal and natural gas respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t, V t CHP is the gas purchase volume of the cogeneration unit at time t, is the volume of CH4 generated by methanogenesis at time t, is the mass of CO2 captured by the CCUS device at time t; is the carbon trading cost at time t; χ is the carbon trading base price; L is the length of the carbon emission interval; θ is the increase in the carbon trading price; δ is the compensation coefficient; is the carbon emission rights actually participating in the carbon trading market transaction at time t;

[0028] The multi-energy balance constraint includes:

[0029]

[0030] In the formula, is the density of NH3, is the load power at time t, is the actual power consumption of photovoltaic output at time t, is the actual power consumption of the wind turbine at time t, is the power consumed by P2H at time t, is the electric power consumed by the ammonia synthesis unit at time t, is the power consumed by the PSA device at time t, P t CCUS,sum is the total energy consumption of CCUS device at time t, is the thermal power generated by the waste heat recovery device at time t, is the amount of hydrogen used by the methanogenation unit at time t, is the amount of hydrogen used by the ammonia synthesis unit at time t, is the volume of NH3 synthesized at time t, is the ammonia storage capacity of the ammonia storage tank at time t, is the amount of ammonia released from the ammonia storage tank at time t.

[0031] As an improvement of the above scheme, the low-carbon operation calculation formula of the coal-fired unit meets the following conditions:

[0032] min C=C1+C2+C3+C4+C5

[0033]

[0034]

[0035] Where C is the total operating cost in a dispatch cycle; C1, C2, C3, C4, and C5 are fuel costs, equipment operation and maintenance costs, carbon trading costs, carbon storage costs, and wind and solar power abandonment penalty costs, respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t; C coal , are the unit price of coal and natural gas respectively; V t CHP is the gas purchase volume of the cogeneration unit at time t; μ PV , μ WT , μ P2H , μ MR , μ P2A , μ CCUS , μ WHR They are the unit operation and maintenance costs of photovoltaic devices, wind turbines, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices; are the actual power consumption of photovoltaic devices and wind turbine outputs respectively; are the operating energy consumption of the P2H unit, ammonia unit, and CCUS unit at time t respectively; is the thermal power generated by the waste heat recovery device at time t; is the volume of CH4 generated by methanogenesis at time t; is the carbon transaction cost at time t, a positive value represents purchase, and a negative value represents sale; C sto is the unit storage cost of CO2; is the mass of CO2 stored in the system; k PV , k WT P is the penalty cost for abandoned solar and wind units; t PV,pre , P t WT,pre are the day-ahead predicted outputs of photovoltaic and wind power at time t respectively; T is the dispatching period.

[0036] Accordingly, an embodiment of the present invention further provides a low-carbon operation control device for a coal-fired unit, comprising: a data acquisition module, a calculation module, a solution module and a control module;

[0037] The data acquisition module is used to acquire the operating parameters of the P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model includes: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device;

[0038] The calculation module is used to substitute the operating parameters into the low-carbon operation calculation formula of the coal-fired unit based on the preset constraints to obtain the low-carbon operation model of the coal-fired unit;

[0039] The solution module is used to solve the low-carbon operation model of the coal-fired unit to obtain the low-carbon operation result of the coal-fired unit; wherein the low-carbon operation result of the coal-fired unit includes: total system operation cost, wind and solar power abandonment rate, P2G-P2A-CCUS joint operation status, system power balance status, and coal-fired unit ammonia blending ratio;

[0040] The control module is used to control the operation of the P2G-P2A-CCUS joint operation model based on the low-carbon operation result of the coal-fired unit.

[0041] The P2G-P2A-CCUS joint operation model includes: a P2H device, a PSA device, a methanation device, a synthetic ammonia device, a cogeneration unit, a coal-fired power generation unit, a CCUS device, a waste heat recovery device, an ammonia storage device, a photovoltaic device and a wind turbine;

[0042] The P2H device is used to electrolyze water to generate hydrogen and transmit nitrogen to the methanation device and the synthetic ammonia device;

[0043] The PSA device is used to absorb nitrogen from the air and transmit the nitrogen to the synthetic ammonia device;

[0044] The methanation device is used to generate methane from the received hydrogen and the received carbon dioxide;

[0045] The ammonia synthesis device is used to react the received nitrogen with the received hydrogen to generate ammonia;

[0046] The cogeneration unit is used to burn the received methane to generate electricity, generate first carbon dioxide, and transmit the first carbon dioxide to the CCUS device;

[0047] The coal-fired power generation unit is used to burn coal and received ammonia to generate electricity, generate second carbon dioxide, and transmit the second carbon dioxide to the CCUS device;

[0048] The CCUS device is used to collect the first carbon dioxide and the received second carbon dioxide, and transmit the collected carbon dioxide to the methanation device;

[0049] The waste heat recovery device is used to collect the heat generated by the methanation device and the synthetic ammonia device;

[0050] The ammonia storage device is used to store ammonia produced by the synthetic ammonia device;

[0051] The photovoltaic device is used for photovoltaic power generation, and the wind turbine is used for wind power generation;

[0052] The P2G system includes: a P2H device and a methanation device; the P2A system includes: a P2H device, a synthetic ammonia device and a PSA device.

[0053] As an improvement of the above scheme, the operating parameters include: coal consumption of coal-fired power generating units when burning with ammonia, gas purchase volume of cogeneration units, unit operation and maintenance costs of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, total energy consumption of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, carbon trading costs, unit CO2 storage costs, the quality of CO2 stored in the system, the day-ahead predicted output of photovoltaic and wind power, and the scheduling cycle.

[0054] As an improvement of the above scheme, the preset constraints include: ladder carbon trading mechanism constraints and multi-energy balance constraints;

[0055] The constraints of the tiered carbon trading mechanism include:

[0056]

[0057]

[0058] In the formula, is the carbon quota of the system at time t; e G 、e H They are the carbon quotas for electricity and heat supply units; Provide power and heat to the cogeneration unit at time t; is the power generation capacity of the coal-fired power generation device at time t; is the CO2 produced by the system at time t; e coal , are the carbon emission intensity of coal and natural gas respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t, V t CHP is the gas purchase volume of the cogeneration unit at time t, is the volume of CH4 generated by methanogenesis at time t, is the mass of CO2 captured by the CCUS device at time t; is the carbon trading cost at time t; χ is the carbon trading base price; L is the length of the carbon emission interval; θ is the increase in the carbon trading price; δ is the compensation coefficient; is the carbon emission rights actually participating in the carbon trading market transaction at time t;

[0059] The multi-energy balance constraint includes:

[0060]

[0061] In the formula, is the density of NH3, is the load power at time t, is the actual power consumption of photovoltaic output at time t, is the actual power consumption of the wind turbine at time t, is the power consumed by P2H at time t, is the electric power consumed by the ammonia synthesis unit at time t, is the power consumed by the PSA device at time t, P t CCUS,sum is the total energy consumption of CCUS device at time t, is the thermal power generated by the waste heat recovery device at time t, is the amount of hydrogen used by the methanogenation unit at time t, is the amount of hydrogen used by the ammonia synthesis unit at time t, is the volume of NH3 synthesized at time t, is the ammonia storage capacity of the ammonia storage tank at time t, is the amount of ammonia released from the ammonia storage tank at time t.

[0062] As an improvement of the above scheme, the low-carbon operation calculation formula of the coal-fired unit meets the following conditions:

[0063] min C=C1+C2+C3+C4+C5

[0064]

[0065]

[0066] Where C is the total operating cost in a dispatch cycle; C1, C2, C3, C4, and C5 are fuel costs, equipment operation and maintenance costs, carbon trading costs, carbon storage costs, and wind and solar power abandonment penalty costs, respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t; C coal , are the unit price of coal and natural gas respectively; V t CHP is the gas purchase volume of the cogeneration unit at time t; μ PV , μ WT, μ P2H , μ MR , μ P2A , μ CCUS , μ WHR They are the unit operation and maintenance costs of photovoltaic devices, wind turbines, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices; are the actual power consumption of photovoltaic devices and wind turbine outputs respectively; are the operating energy consumption of the P2H unit, ammonia unit, and CCUS unit at time t respectively; is the thermal power generated by the waste heat recovery device at time t; is the volume of CH4 generated by methanogenesis at time t; is the carbon transaction cost at time t, a positive value represents purchase, and a negative value represents sale; C sto is the unit storage cost of CO2; is the mass of CO2 stored in the system; k PV , k WT P is the penalty cost for abandoned solar and wind units; t PV,pre , P t WT,pre are the day-ahead predicted outputs of photovoltaic and wind power at time t respectively; T is the dispatching period.

[0067] As can be seen from the above, the present invention has the following beneficial effects:

[0068] The present invention provides a low-carbon operation control method for a coal-fired unit, which obtains operating parameters of a P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model comprises: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device; based on preset constraints, the operating parameters are substituted into a low-carbon operation calculation formula for the coal-fired unit to obtain a low-carbon operation model for the coal-fired unit; the low-carbon operation model for the coal-fired unit is solved to obtain a low-carbon operation result for the coal-fired unit; wherein the low-carbon operation result for the coal-fired unit comprises: total system operating cost, wind and solar power abandonment rate, P2G-P2A-CCUS joint operation status, system power balance status, and ammonia blending ratio of the coal-fired unit; based on the low-carbon operation result of the coal-fired unit, the operation of the P2G-P2A-CCUS joint operation model is controlled. The present invention introduces P2A technology into the P2G-CCUS joint operation module to receive and process excess hydrogen, thereby solving the problem that P2H generation is difficult to achieve stable matching with the carbon dioxide capture amount in the CCUS system. Based on preset constraints and the low-carbon operation model of coal-fired units, the present invention reduces the carbon emissions of the P2G-P2A-CCUS joint operation system and better maintains the stability of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 It is a flow chart of a low-carbon operation control method for a coal-fired unit provided by an embodiment of the present invention;

[0070] Figure 2 It is a structural schematic diagram of a low-carbon operation control device for a coal-fired unit provided by an embodiment of the present invention;

[0071] Figure 3 This is a schematic diagram of the structure of a terminal device provided by an embodiment of the present invention;

[0072] Figure 4 It is the operation architecture of the P2G-P2A-CCUS joint operation model provided by an embodiment of the present invention;

[0073] Figure 5 is a schematic diagram of load and renewable energy prediction values ​​provided by an embodiment of the present invention;

[0074] Figure 6 It is a schematic diagram of hydrogen energy allocation of a P2G-P2A-CCUS joint operation model provided by an embodiment of the present invention;

[0075] Figure 7 It is a schematic diagram of the ammonia blending ratio for coal-fired ammonia blending power generation provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0076] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0077] Embodiment 1

[0078] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of a low-carbon operation control method for a coal-fired unit provided by an embodiment of the present invention. Figure 1 As shown, this embodiment includes steps 101 to 104, and each step is specifically as follows:

[0079] Step 101: Acquire the operating parameters of the P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model includes: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device.

[0080] In a specific embodiment, considering the low overall conversion efficiency of P2G, the P2G device is subdivided into two stages: water electrolysis (P2H) and methanation (MR). Hydrogen is produced by water electrolysis, and the hydrogen energy is flexibly allocated by the synthetic ammonia reaction: when the demand for CH4 increases, more hydrogen can be allocated to the methanation reaction; P2A technology is added, and green hydrogen produced by water electrolysis is used to synthesize green ammonia with nitrogen in the air, and then mixed with coal for combustion, to complete the ammonia-blending low-carbon transformation of coal-fired units, realize the large-scale replacement of fossil fuels by green ammonia, and further reduce the coal consumption and carbon emissions of coal-fired power generation units. When the demand for synthetic ammonia increases, hydrogen is more used to react with N2 to generate NH3. At the same time, CCUS technology captures CO2 emitted by coal-fired units and gas cogeneration to provide raw materials for methanation. The CH4 produced by methanation is fed into the gas cogeneration for combustion, thus forming a P2G-P2A-CCUS joint operation model, expanding the diversified consumption paths of wind and solar resources, and realizing efficient consumption of regional wind and solar power and recycling of carbon.

[0081] In this embodiment, the P2G-P2A-CCUS joint operation model includes: a P2H device, a PSA device, a methanation device, a synthetic ammonia device, a cogeneration unit, a coal-fired power generation unit, a CCUS device, a waste heat recovery device, an ammonia storage device, a photovoltaic device and a wind turbine;

[0082] The P2H device is used to electrolyze water to generate hydrogen and transmit nitrogen to the methanation device and the synthetic ammonia device;

[0083] The PSA device is used to absorb nitrogen from the air and transmit the nitrogen to the synthetic ammonia device;

[0084] The methanation device is used to generate methane from the received hydrogen and the received carbon dioxide;

[0085] The ammonia synthesis device is used to react the received nitrogen with the received hydrogen to generate ammonia;

[0086] The cogeneration unit is used to burn the received methane to generate electricity, generate first carbon dioxide, and transmit the first carbon dioxide to the CCUS device;

[0087] The coal-fired power generation unit is used to burn coal and received ammonia to generate electricity, generate second carbon dioxide, and transmit the second carbon dioxide to the CCUS device;

[0088] The CCUS device is used to collect the first carbon dioxide and the received second carbon dioxide, and transmit the collected carbon dioxide to the methanation device;

[0089] The waste heat recovery device is used to collect the heat generated by the methanation device and the synthetic ammonia device;

[0090] The ammonia storage device is used to store ammonia produced by the synthetic ammonia device;

[0091] The photovoltaic device is used for photovoltaic power generation, and the wind turbine is used for wind power generation;

[0092] The P2G system includes: a P2H device and a methanation device; the P2A system includes: a P2H device, a synthetic ammonia device and a PSA device.

[0093] In this embodiment, the operation of the P2G-P2A-CCUS joint operation model is controlled based on the low-carbon operation result of the coal-fired unit.

[0094] In a specific embodiment, the water electrolysis device (P2H device) meets the following conditions:

[0095]

[0096]

[0097] In the formula, is the volume of H2 produced by P2H at time t; is the electric power consumed by P2H at time t; η P2H is the electrolysis efficiency of the P2H device; is the unit energy consumption for hydrogen production; The upper limit of the power consumption of the P2H device.

[0098] In a specific embodiment, the methanogenation device (MR device) meets the following conditions:

[0099]

[0100] In the formula, is the mass of CO2 required for methanogenesis at time t; is the volume of H2 consumed by methanogenesis at time t; is the density of CO2; is the volume of CH4 generated by methanogenesis at time t.

[0101] In a specific embodiment, the ammonia synthesis device combines green hydrogen produced by electrolysis of water with nitrogen in the air, and continues to use green electricity to synthesize green ammonia. The device meets the following conditions:

[0102]

[0103] In the formula, is the electric power consumed by the ammonia synthesis unit at time t; is the volume of NH3 synthesized at time t; is the energy consumption per unit of ammonia production; is the volume of H2 required for the ammonia synthesis reaction at time t; The upper limit of electrical power consumption of the electric-to-ammonia conversion device.

[0104] In a specific embodiment, the PSA unit uses pressure swing adsorption nitrogen technology, which is widely used for nitrogen production due to its high efficiency and low operation and maintenance cost. In order to reduce the power consumption of the PSA unit, the nitrogen production is adjusted according to the hydrogen consumption rate of the synthetic ammonia reaction. The pressure swing adsorption nitrogen of the PSA unit meets the following conditions:

[0105]

[0106] In the formula, is the electric power consumed by the PSA device at time t; N2 energy consumption is measured in units.

[0107] In a specific embodiment, a CCUS device captures CO2 generated by a coal-fired unit and a gas-fired cogeneration unit, a portion of the captured CO2 provides a stable carbon source for hydrogen methanation, and the remaining portion is sealed and managed. The CCUS device meets the following conditions:

[0108]

[0109]

[0110] Where P t CCS,sum is the total energy consumption of CCUS at time t; P base is the fixed energy consumption of CCUS; is the operating energy consumption of CCUS at time t; w c The energy consumption for treating unit mass of CO2; is the mass of CO2 captured by CCUS at time t; is the mass of CO2 stored in the system; is the maximum operating energy consumption of the CCUS device.

[0111] In a specific embodiment, the coal-fired power generation unit adopts green ammonia for power generation, and the fuel source is cleaner. The coal-fired power generation unit meets the following conditions:

[0112]

[0113] Since the combustion of coal-fired units with ammonia will have a certain impact on the internal combustion conditions, the proportion of ammonia blended in coal-fired units is restricted:

[0114] 0≤β t ≤β max

[0115] In the formula, a1, b1, c1 are the coal consumption characteristic coefficients of the coal-fired unit; is the coal consumption of coal-fired unit when burning with ammonia at time t; is the power generation capacity of the coal-fired unit at time t; L coal They are the lower heating values ​​of ammonia and coal respectively; β t are the ammonia content and ammonia ratio of the coal-fired unit at time t respectively; are the minimum and maximum power generation of coal-fired units respectively; They are respectively the minimum and maximum climbing power of the coal-fired unit.

[0116] In a specific embodiment, the ammonia storage device can flexibly adjust the amount of ammonia storage and release in combination with the ammonia blending demand of the coal-fired unit, realize the flexible transfer of ammonia energy, and further improve the wind and solar power consumption capacity. The ammonia storage device meets the following conditions:

[0117]

[0118] Where: are the ammonia storage amounts in the ammonia storage device at time t and time t-1 respectively; is the ammonia storage capacity and ammonia release capacity of the ammonia storage device at time t; They are the ammonia storage and release efficiencies of the ammonia storage device respectively; Respectively represent the upper and lower limits of the ammonia storage device capacity; They are the maximum storage and release capacities of the ammonia storage device respectively; It is a 0 / 1 variable, which represents the parameters of the ammonia storage and ammonia release status of the ammonia storage device, 0 means closed, and 1 means open; is the initial capacity of the ammonia storage device, T is the system scheduling cycle, and the capacity of the ammonia storage device remains unchanged after a scheduling cycle.

[0119] In a specific embodiment, the waste heat recovery device can recover waste heat from multiple links, including waste heat utilization from methanation reaction and waste heat utilization from synthetic ammonia reaction. The waste heat utilization from multiple links cooperates with the gas cogeneration unit to jointly meet the system heat load and improve the comprehensive utilization efficiency of energy:

[0120] In the methanation device, the efficiency of hydrogen methanation reaction will decrease with the strong reaction heat. Therefore, introducing a heat recovery device to recycle the reaction heat during the methanation reaction stage can not only improve the reaction efficiency, but also realize the refined utilization of electrical energy to gas energy and thermal energy, and improve energy utilization efficiency. The methanation waste heat utilization model is as follows:

[0121]

[0122] In the formula, is the waste heat power generated by methanation at time t; ΔH is the heat of methanation reaction; is the proportion of waste heat recovered.

[0123] In ammonia synthesis units, the heat of reaction is usually dissipated directly into the air to maintain a constant temperature in the reaction equipment, resulting in thermal pollution and waste of resources. To solve this problem, a liquid cooling system is used to cool the generated ammonia. The waste heat of the liquid cooling system is then recovered and used to supply the heat load, thereby improving energy efficiency to a certain extent. The model for the utilization of waste heat from the ammonia synthesis reaction is as follows:

[0124]

[0125] In the formula, is the waste heat power provided to the system by the electricity-to-ammonia process at time t; The heat power released by generating a unit of ammonia; The proportion of heat released from electricity-to-ammonia conversion used for heating.

[0126] The waste heat recovery device utilizes the waste heat power generated by the hydrogen methanation and ammonia synthesis process to recover waste heat to meet part of the system heat load. The waste heat recovery device meets the following conditions:

[0127]

[0128] In the formula, is the thermal power generated by the waste heat recovery device at time t; is the waste heat power input to the waste heat recovery device at time t; η WHR It is the heat exchange efficiency of the waste heat recovery device.

[0129] Step 102: Based on preset constraints, the operating parameters are substituted into the low-carbon operation calculation formula of the coal-fired unit to obtain a low-carbon operation model of the coal-fired unit.

[0130] In this embodiment, the preset constraints include: ladder carbon trading mechanism constraints and multi-energy balance constraints;

[0131] The constraints of the tiered carbon trading mechanism include:

[0132]

[0133]

[0134] In the formula, is the carbon quota of the system at time t; e G 、e H They are the carbon quotas for electricity and heat supply units; Provide power and heat to the cogeneration unit at time t; is the power generation capacity of the coal-fired power generation device at time t; is the CO2 produced by the system at time t; e coal , are the carbon emission intensity of coal and natural gas respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t, is the gas purchase volume of the cogeneration unit at time t, is the volume of CH4 generated by methanogenesis at time t, is the mass of CO2 captured by the CCUS device at time t; is the carbon trading cost at time t; χ is the carbon trading base price; L is the length of the carbon emission interval; θ is the increase in the carbon trading price; δ is the compensation coefficient; is the carbon emission rights actually participating in the carbon trading market transaction at time t;

[0135] The multi-energy balance constraint includes:

[0136]

[0137]

[0138] In the formula, is the density of NH3, is the load power at time t, is the actual power consumption of photovoltaic output at time t, is the actual power consumption of the wind turbine at time t, is the power consumed by P2H at time t, is the electric power consumed by the ammonia synthesis unit at time t, is the power consumed by the PSA device at time t, P t CCUS,sum is the total energy consumption of CCUS device at time t, is the thermal power generated by the waste heat recovery device at time t, is the amount of hydrogen used by the methanogenation unit at time t, is the amount of hydrogen used by the ammonia synthesis unit at time t, is the volume of NH3 synthesized at time t, is the ammonia storage capacity of the ammonia storage tank at time t, is the amount of ammonia released from the ammonia storage tank at time t.

[0139] In this embodiment, the low-carbon operation calculation formula of the coal-fired unit meets the following conditions:

[0140] min C=C1+C2+C3+C4+C5

[0141]

[0142] Where C is the total operating cost in a dispatch cycle; C1, C2, C3, C4, and C5 are fuel costs, equipment operation and maintenance costs, carbon trading costs, carbon storage costs, and wind and solar power abandonment penalty costs, respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t; C coal , They are the unit price of coal and the unit price of natural gas respectively; is the gas purchase volume of the cogeneration unit at time t; μ PV , μ WT , μ P2H , μ MR , μ P2A , μ CCUS , μ WHR They are the unit operation and maintenance costs of photovoltaic devices, wind turbines, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices; are the actual power consumption of photovoltaic devices and wind turbine outputs respectively; are the operating energy consumption of the P2H unit, ammonia unit, and CCUS unit at time t respectively; is the thermal power generated by the waste heat recovery device at time t; is the volume of CH4 generated by methanogenesis at time t; is the carbon transaction cost at time t, a positive value represents purchase, and a negative value represents sale; C sto is the unit storage cost of CO2; is the mass of CO2 stored in the system; k PV , k WT P is the penalty cost for abandoned solar and wind units; t PV,pre , P t WT,pre are the day-ahead predicted outputs of photovoltaic and wind power at time t respectively; T is the dispatching period.

[0143] Step 103: Solve the low-carbon operation model of the coal-fired unit to obtain the low-carbon operation results of the coal-fired unit; wherein the low-carbon operation results of the coal-fired unit include: total system operating cost, wind and solar power abandonment rate, P2G-P2A-CCUS joint operation status, system power balance status, and coal-fired unit ammonia blending ratio.

[0144] In this embodiment, when an integer solution that satisfies all constraints is found by the Gurobi solver, and the objective function value of the solution is the same as the objective function value of the relaxation problem (LP relaxation, i.e., the continuous solution that ignores the integer constraint solution) or the difference is within the set tolerance range, it is considered that the optimal solution has been found.

[0145] Default tolerance: Gurobi uses the relative optimization gap (MIPGap) by default, which calculates the relative gap between the optimal integer solution and the current LP relaxation solution. When the gap is 0 or less than the set tolerance, Gurobi considers that the global optimal solution has been found and outputs the solution. The default tolerance is 0.0001 (i.e. 0.01%), which can be adjusted by the parameter MIPGap.

[0146] The low-carbon operation model of coal-fired units is a mixed integer linear programming problem. The day-ahead optimization scheduling model is built based on Yalmip on the MATLAB platform. The model includes the constraints of the step-by-step carbon trading mechanism, multi-energy balance and other constraints and objective functions described in the steps. The gurobi solver is called to optimize and solve the model.

[0147] Step 104: Based on the low-carbon operation result of the coal-fired unit, control the operation of the P2G-P2A-CCUS joint operation model.

[0148] In a specific embodiment, the low-carbon operation architecture of the coal-fired unit with wind and solar power multi-consumption and carbon recycling is constructed as follows: Figure 4 ; The basic system parameters include the predicted values ​​of electric load, thermal load, predicted values ​​of wind turbine and photovoltaic output, the composition and operation parameters of multi-energy coupling equipment, etc. The relevant system parameters are shown in Table 1, and the predicted values ​​of load and renewable energy are shown in Figure 5 .

[0149] Table 1 System related parameters

[0150]

[0151] For this embodiment, in order to verify the superiority of the low-carbon operation model of the coal-fired unit with wind and solar power multi-consumption and carbon recycling constructed by the present invention, four scenarios are set for comparative analysis, see Table 2; the operation results of the four scenarios are shown in Table 3. Figure 6 The hydrogen energy allocation for the combined operation of P2G-P2A-CCUS is shown in Figure 2. Figure 7 It is the ammonia ratio of coal-fired ammonia power generation.

[0152] Table 2 Operation schemes for different scenarios

[0153]

[0154] Table 3 Comparison of optimization results in different scenarios

[0155]

[0156] The software used to perform the case simulation is MATLAB_R2021a configured with the YALMIP toolbox, and the GUROBI solver is called for solving; the simulation platform processor used is Intel i5-9300H, the memory is 8GB, and the operating system is 64-bit Windows 11; the scheduling cycle is 24h, and the time interval is 1h.

[0157] Compared with Case 1, Case 2 introduces coal-fired mixed with green ammonia power generation technology. Combined with Table 3, it can be seen that the coal-fired mixed with green ammonia power generation unit fully utilizes its economic and low-carbon operation characteristics, which reduces the total system operation cost by 17.44%, including a 6.11% reduction in fuel costs, a 61.64% reduction in wind and solar power abandonment penalties, and an increase in carbon trading income by 18.48%. Therefore, the introduction of coal-fired mixed with green ammonia power generation technology, the use of excess wind and solar resources in the region to complete the conversion of electricity and ammonia, realize the large-scale replacement of fossil fuels by green ammonia, reduce the coal consumption and carbon emissions of coal-fired power generation units, and realize the low-carbon economic operation of coal-fired units.

[0158] In order to further realize the system's ability to absorb wind and solar power and its low-carbon operation characteristics, Case 3 introduced the P2G-P2A-CCUS joint operation mode. By refining the operation processes of P2G and P2A, it realizes the flexible conversion of hydrogen-methane and hydrogen-ammonia, and cooperates with CCUS equipment to realize the recycling of CO2 and alleviate the storage pressure of CCUS equipment. Compared with Case 2, the total operating cost of the system decreased by 6.01%, the penalty for abandoning wind and solar power decreased by 52.52%, and the carbon emission benefits increased by 7.64%. It can be seen that compared with the traditional operation mode, the P2G-P2A-CCUS joint operation mode can not only further reduce the system operation cost and the penalty for abandoning wind and solar power, but also improve the overall low-carbon benefits and resource utilization efficiency of the system through flexible energy conversion and CCUS equipment.

[0159] In order to improve the comprehensive utilization efficiency of energy, Case 4 uses a waste heat recovery device to reuse the waste heat from methanation and synthetic ammonia reactions, meeting part of the heat load demand, reducing the system's heating energy consumption, and improving the system's heating flexibility. Compared with Case 3, the total system operating cost was reduced by 9.03%, and the penalty for wind and solar power abandonment was reduced by 32.6%. The carbon emission benefits were reduced by 9.94%, because the reuse of waste heat resources reduced the thermal output of the gas-fired cogeneration unit, resulting in a decrease in the carbon quota obtained by the heating unit. In Case 4, the distribution of hydrogen energy is as follows: Figure 6 As shown in the figure, the ammonia added to coal-fired power generation is as follows: Figure 7 As shown. Combined Figure 3 and Figure 4It can be seen that when wind and solar resources are abundant, the system will give priority to synthesizing ammonia from hydrogen, and under the premise of ensuring safety, it will be mixed with coal at the maximum ammonia ratio to generate electricity, ensuring that the coal-fired units can achieve low-carbon operation under optimal conditions.

[0160] See also Figure 2 , Figure 2 It is a structural schematic diagram of a low-carbon operation control device for a coal-fired unit provided by an embodiment of the present invention, comprising: a data acquisition module 201, a calculation module 202, a solution module 203 and a control module 204;

[0161] The data acquisition module is used to acquire the operating parameters of the P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model includes: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device;

[0162] The calculation module is used to substitute the operating parameters into the low-carbon operation calculation formula of the coal-fired unit based on the preset constraints to obtain the low-carbon operation model of the coal-fired unit;

[0163] The solution module is used to solve the low-carbon operation model of the coal-fired unit to obtain the low-carbon operation result of the coal-fired unit; wherein the low-carbon operation result of the coal-fired unit includes: total system operation cost, wind and solar power abandonment rate, P2G-P2A-CCUS joint operation status, system power balance status, and coal-fired unit ammonia blending ratio;

[0164] The control module is used to control the operation of the P2G-P2A-CCUS joint operation model based on the low-carbon operation result of the coal-fired unit.

[0165] It can be understood that the above-mentioned system item embodiments correspond to the method item embodiments of the present invention, which can implement the low-carbon operation control method of the coal-fired unit provided by any one of the above-mentioned method item embodiments of the present invention.

[0166] This embodiment obtains the operating parameters of the P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model includes: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device; based on preset constraints, the operating parameters are substituted into the low-carbon operation calculation formula of the coal-fired unit to obtain the low-carbon operation model of the coal-fired unit; the low-carbon operation model of the coal-fired unit is solved to obtain the low-carbon operation result of the coal-fired unit; wherein the low-carbon operation result of the coal-fired unit includes: total system operating cost, wind and solar power abandonment rate, P2G-P2A-CCUS joint operation status, system power balance status, and ammonia blending ratio of the coal-fired unit; based on the low-carbon operation result of the coal-fired unit, the operation of the P2G-P2A-CCUS joint operation model is controlled. The present invention introduces P2A technology into the P2G-CCUS joint operation module to receive and process excess hydrogen, thereby solving the problem that P2H generation is difficult to achieve stable matching with the carbon dioxide capture amount in the CCUS system. Based on preset constraints and the low-carbon operation model of coal-fired units, the present invention reduces the carbon emissions of the P2G-P2A-CCUS joint operation system and better maintains the stability of the system operation.

[0167] Embodiment 2

[0168] See also Figure 3 , Figure 3 It is a schematic diagram of the structure of a terminal device provided in one embodiment of the present invention.

[0169] A terminal device of this embodiment includes: a processor 301, a memory 302, and a computer program stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program, the steps of the above-mentioned low-carbon operation control method of each coal-fired unit in the embodiment are implemented, for example Figure 1 Alternatively, when the processor executes the computer program, the functions of each module in the above-mentioned system embodiments are realized, for example: Figure 2 All modules of the low-carbon operation control device for coal-fired units are shown.

[0170] In addition, an embodiment of the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the low-carbon operation control method of the coal-fired unit as described in any of the above embodiments.

[0171] Those skilled in the art will understand that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the diagram, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0172] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 301 is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0173] The memory 302 can be used to store the computer program and / or module. The processor 301 implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory 302. The memory 302 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0174] Wherein, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or system capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0175] It should be noted that the system embodiment described above is merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the system embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0176] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A low-carbon operation control method for a coal-fired unit, characterized in that: Applied to the P2G-P2A-CCUS joint operation model, including: Obtaining operating parameters of the P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model includes: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device; Based on the preset constraints, the operating parameters are substituted into the low-carbon operation calculation formula of the coal-fired unit to obtain the low-carbon operation model of the coal-fired unit; Solving the low-carbon operation model of the coal-fired unit to obtain the low-carbon operation results of the coal-fired unit; wherein the low-carbon operation results of the coal-fired unit include: total system operating cost, wind and solar power abandonment rate, P2G-P2A-CCUS joint operation status, system power balance status, and coal-fired unit ammonia blending ratio; Based on the low-carbon operation results of the coal-fired unit, the operation of the P2G-P2A-CCUS joint operation model is controlled.

2. The low-carbon operation control method of a coal-fired unit according to claim 1, characterized in that: The P2G-P2A-CCUS joint operation model includes: a P2H device, a PSA device, a methanation device, a synthetic ammonia device, a cogeneration unit, a coal-fired power generation unit, a CCUS device, a waste heat recovery device, an ammonia storage device, a photovoltaic device and a wind turbine; The P2H device is used to electrolyze water to generate hydrogen and transmit nitrogen to the methanation device and the synthetic ammonia device; The PSA device is used to absorb nitrogen from the air and transmit the nitrogen to the synthetic ammonia device; The methanation device is used to generate methane from the received hydrogen and the received carbon dioxide; The ammonia synthesis device is used to react the received nitrogen with the received hydrogen to generate ammonia; The cogeneration unit is used to burn the received methane to generate electricity, generate first carbon dioxide, and transmit the first carbon dioxide to the CCUS device; The coal-fired power generation unit is used to burn coal and received ammonia to generate electricity, generate second carbon dioxide, and transmit the second carbon dioxide to the CCUS device; The CCUS device is used to collect the first carbon dioxide and the received second carbon dioxide, and transmit the collected carbon dioxide to the methanation device; The waste heat recovery device is used to collect the heat generated by the methanation device and the synthetic ammonia device; The ammonia storage device is used to store ammonia produced by the synthetic ammonia device; The photovoltaic device is used for photovoltaic power generation, and the wind turbine is used for wind power generation; The P2G system includes: a P2H device and a methanation device; the P2A system includes: a P2H device, a synthetic ammonia device and a PSA device.

3. The low-carbon operation control method of a coal-fired unit according to claim 2, characterized in that: The operating parameters include: coal consumption of coal-fired power generating units when burning with ammonia, gas purchase volume of cogeneration units, unit operation and maintenance costs of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, total energy consumption of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, carbon trading costs, unit CO2 storage costs, the quality of CO2 stored in the system, the day-ahead predicted output of photovoltaic and wind power, and the scheduling cycle.

4. The low-carbon operation control method of a coal-fired unit according to claim 3, characterized in that: The preset constraints include: ladder carbon trading mechanism constraints and multi-energy balance constraints; The constraints of the tiered carbon trading mechanism include: In the formula, is the carbon quota of the system at time t; e G 、e H They are the carbon quotas for electricity and heat supply units; Provide power and heat to the cogeneration unit at time t; is the power generation capacity of the coal-fired power generation device at time t; is the CO2 produced by the system at time t; e coal , are the carbon emission intensity of coal and natural gas respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t, is the gas purchase volume of the cogeneration unit at time t, is the volume of CH4 generated by methanogenesis at time t, is the mass of CO2 captured by the CCUS device at time t; is the carbon trading cost at time t; χ is the carbon trading base price; L is the length of the carbon emission interval; θ is the increase in the carbon trading price; δ is the compensation coefficient; is the carbon emission rights actually participating in the carbon trading market transaction at time t; The multi-energy balance constraint includes: In the formula, is the density of NH3, is the load power at time t, is the actual power consumption of photovoltaic output at time t, is the actual power consumption of the wind turbine at time t, is the power consumed by P2H at time t, is the electric power consumed by the ammonia synthesis unit at time t, is the power consumed by the PSA device at time t, is the total energy consumption of CCUS device at time t, is the thermal power generated by the waste heat recovery device at time t, is the amount of hydrogen used by the methanogenation unit at time t, is the amount of hydrogen used by the ammonia synthesis unit at time t, is the volume of NH3 synthesized at time t, is the ammonia storage capacity of the ammonia storage tank at time t, is the amount of ammonia released from the ammonia storage tank at time t.

5. The low-carbon operation control method of a coal-fired unit according to claim 4, characterized in that: The calculation formula for low-carbon operation of coal-fired units meets the following conditions: min C=C1+C2+C3+C4+C5 Where C is the total operating cost in a dispatch cycle; C1, C2, C3, C4, and C5 are fuel costs, equipment operation and maintenance costs, carbon trading costs, carbon storage costs, and wind and solar power abandonment penalty costs, respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t; C coal , They are the unit price of coal and the unit price of natural gas respectively; is the gas purchase volume of the cogeneration unit at time t; μ PV , μ WT , μ P2H , μ MR , μ P2A , μ CCUS , μ WHR They are the unit operation and maintenance costs of photovoltaic devices, wind turbines, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices; are the actual power consumption of photovoltaic devices and wind turbine outputs respectively; are the operating energy consumption of the P2H unit, ammonia unit, and CCUS unit at time t respectively; is the thermal power generated by the waste heat recovery device at time t; is the volume of CH4 generated by methanogenesis at time t; is the carbon transaction cost at time t, a positive value represents purchase, and a negative value represents sale; C sto is the unit storage cost of CO2; is the mass of CO2 stored in the system; k PV , k WT Penalize the cost of abandoning solar and wind power; are the day-ahead predicted outputs of photovoltaic and wind power at time t respectively; T is the dispatching period.

6. A low-carbon operation control device for a coal-fired unit, characterized in that: include: Data acquisition module, calculation module, solution module and control module; The data acquisition module is used to acquire the operating parameters of the P2G-P2A-CCUS joint operation model; wherein the P2G-P2A-CCUS joint operation model includes: a P2G system, a P2A system and a CCUS device; the P2A system is used to receive hydrogen generated by the P2G system that cannot be applied to the CCUS device; The calculation module is used to substitute the operating parameters into the low-carbon operation calculation formula of the coal-fired unit based on the preset constraints to obtain the low-carbon operation model of the coal-fired unit; The solution module is used to solve the low-carbon operation model of the coal-fired unit to obtain the low-carbon operation result of the coal-fired unit; wherein the low-carbon operation result of the coal-fired unit includes: total system operation cost, wind and solar power abandonment rate, P2G-P2A-CCUS joint operation status, system power balance status, and coal-fired unit ammonia blending ratio; The control module is used to control the operation of the P2G-P2A-CCUS joint operation model based on the low-carbon operation result of the coal-fired unit.

7. The low-carbon operation control device for a coal-fired unit according to claim 6, characterized in that: The P2G-P2A-CCUS joint operation model includes: a P2H device, a PSA device, a methanation device, a synthetic ammonia device, a cogeneration unit, a coal-fired power generation unit, a CCUS device, a waste heat recovery device, an ammonia storage device, a photovoltaic device and a wind turbine; The P2H device is used to electrolyze water to generate hydrogen and transmit nitrogen to the methanation device and the synthetic ammonia device; The PSA device is used to absorb nitrogen from the air and transmit the nitrogen to the synthetic ammonia device; The methanation device is used to generate methane from the received hydrogen and the received carbon dioxide; The ammonia synthesis device is used to react the received nitrogen with the received hydrogen to generate ammonia; The cogeneration unit is used to burn the received methane to generate electricity, generate first carbon dioxide, and transmit the first carbon dioxide to the CCUS device; The coal-fired power generation unit is used to burn coal and received ammonia to generate electricity, generate second carbon dioxide, and transmit the second carbon dioxide to the CCUS device; The CCUS device is used to collect the first carbon dioxide and the received second carbon dioxide, and transmit the collected carbon dioxide to the methanation device; The waste heat recovery device is used to collect the heat generated by the methanation device and the synthetic ammonia device; The ammonia storage device is used to store ammonia produced by the synthetic ammonia device; The photovoltaic device is used for photovoltaic power generation, and the wind turbine is used for wind power generation; The P2G system includes: a P2H device and a methanation device; the P2A system includes: a P2H device, a synthetic ammonia device and a PSA device.

8. The low-carbon operation control device for a coal-fired unit according to claim 7, characterized in that: The operating parameters include: coal consumption of coal-fired power generating units when burning with ammonia, gas purchase volume of cogeneration units, unit operation and maintenance costs of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, total energy consumption of photovoltaic devices, fans, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices, carbon trading costs, unit CO2 storage costs, the quality of CO2 stored in the system, the day-ahead predicted output of photovoltaic and wind power, and the scheduling cycle.

9. The low-carbon operation control device for a coal-fired unit according to claim 8, characterized in that: The preset constraints include: ladder carbon trading mechanism constraints and multi-energy balance constraints; The constraints of the tiered carbon trading mechanism include: In the formula, is the carbon quota of the system at time t; e G 、e H They are the carbon quotas for electricity and heat supply units; Provide power and heat to the cogeneration unit at time t; is the power generation capacity of the coal-fired power generation device at time t; is the CO2 produced by the system at time t; e coal , are the carbon emission intensity of coal and natural gas respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t, is the gas purchase volume of the cogeneration unit at time t, is the volume of CH4 generated by methanogenesis at time t, is the mass of CO2 captured by the CCUS device at time t; is the carbon trading cost at time t; χ is the carbon trading base price; L is the length of the carbon emission interval; θ is the increase in the carbon trading price; δ is the compensation coefficient; is the carbon emission rights actually participating in the carbon trading market transaction at time t; The multi-energy balance constraint includes: In the formula, is the density of NH3, is the load power at time t, is the actual power consumption of photovoltaic output at time t, is the actual power consumption of the wind turbine at time t, is the power consumed by P2H at time t, is the electric power consumed by the ammonia synthesis unit at time t, is the power consumed by the PSA device at time t, is the total energy consumption of CCUS device at time t, is the thermal power generated by the waste heat recovery device at time t, is the amount of hydrogen used by the methanogenation unit at time t, is the amount of hydrogen used by the ammonia synthesis unit at time t, is the volume of NH3 synthesized at time t, is the ammonia storage capacity of the ammonia storage tank at time t, is the amount of ammonia released from the ammonia storage tank at time t.

10. The low-carbon operation control device for a coal-fired unit according to claim 9, characterized in that: The calculation formula for low-carbon operation of coal-fired units meets the following conditions: min C=C1+C2+C3+C4+C5 Where C is the total operating cost in a dispatch cycle; C1, C2, C3, C4, and C5 are fuel costs, equipment operation and maintenance costs, carbon trading costs, carbon storage costs, and wind and solar power abandonment penalty costs, respectively; is the coal consumption of the coal-fired power generation unit when burning with ammonia at time t; C coal , They are the unit price of coal and the unit price of natural gas respectively; is the gas purchase volume of the cogeneration unit at time t; μ PV , μ WT , μ P2H , μ MR , μ P2A , μ CCUS , μ WHR They are the unit operation and maintenance costs of photovoltaic devices, wind turbines, P2H devices, methanation devices, synthetic ammonia devices, CCUS devices, and waste heat recovery devices; are the actual power consumption of photovoltaic devices and wind turbine outputs respectively; are the operating energy consumption of the P2H unit, ammonia unit, and CCUS unit at time t respectively; is the thermal power generated by the waste heat recovery device at time t; is the volume of CH4 generated by methanogenesis at time t; is the carbon transaction cost at time t, a positive value represents purchase, and a negative value represents sale; C sto is the unit storage cost of CO2; is the mass of CO2 stored in the system; k PV , k WT Penalize the cost of abandoning solar and wind power; are the day-ahead predicted outputs of photovoltaic and wind power at time t respectively; T is the dispatching period.

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