Low-carbon operation method of park heat and power production system

Abstract

The present application relates to the technical field of comprehensive energy, and discloses a low-carbon operation method for a park heat and power production system, comprising the following steps: determining a carbon monitoring boundary of the park; constructing a carbon emission data acquisition method for an energy heat and power production system within the carbon monitoring boundary; constructing a digital twin model of the heat and power production system, and acquiring carbon emission data according to the carbon emission data acquisition method; constructing an objective function, setting a constraint condition, and solving and calculating a low-carbon operation optimal value of the park according to a load demand. The method enables online direct calculation of carbon emission indexes of the park heat and power production system, and from the perspective of the park energy system, constructs a low-carbon optimal operation mode that meets safety, stability and balance conditions.

Description

Technical Field

[0001] This invention relates to the field of integrated energy technology, and in particular to a low-carbon operation method for a thermal power generation system in an industrial park. Background Technology

[0002] The industrial park is increasingly characterized by multi-energy complementarity, with the entire system encompassing various external energy sources, on-site energy production equipment, energy consumers, and a transmission microgrid. Centralized energy sources, particularly cogeneration units, are typically heat-driven and highly coupled, with limited load flexibility due to DCS control strategies and boiler combustion stability. Distributed energy sources are intermittent, random, slow-responding, and have low inertia, making them difficult to control and respond promptly to user load changes. Large-scale energy storage, thermal storage, and hydrogen fuel cell devices are costly and have poor safety and reliability, resulting in a low current deployment ratio. Therefore, achieving energy supply security and stability, load balance among different users, and maximizing low-carbon operation of the cogeneration system within the existing energy configuration presents a new technical challenge. Consequently, a method for low-carbon operation of the industrial park's cogeneration system is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to propose a low-carbon operation method for a park thermal power production system, which enables the carbon emission index of the park thermal power production system to be calculated directly online, and constructs an optimal low-carbon operation mode that meets the conditions of safety, stability and balance from the perspective of the park's energy system.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This invention provides a low-carbon operation method for a thermal power generation system in an industrial park, comprising the following steps:

[0006] Determine the carbon monitoring boundaries of the industrial park;

[0007] A method for acquiring carbon emission data of the thermal power production system of the aforementioned energy source;

[0008] A digital twin model of the thermal power production system is constructed, and carbon emission data is obtained according to the carbon emission data acquisition method.

[0009] Construct an objective function and set constraints, then solve for the optimal value for low-carbon operation of the park based on load demand.

[0010] As a preferred embodiment of the low-carbon operation method for the aforementioned thermal power production system in the industrial park, the method for acquiring carbon emission data of the thermal power production system includes the following steps:

[0011] Determine and monitor operational data for thermoelectric inputs outside the carbon monitoring boundary;

[0012] Identify and monitor the operational data of thermal power generation emission sources within the carbon monitoring boundary;

[0013] Based on the operational data obtained above, the overall carbon emissions of the park, the carbon emission intensity of heating in the park, and the carbon emission intensity of power supply in the park are derived.

[0014] As a preferred embodiment of the low-carbon operation method for the aforementioned thermal power production system in the park, the operation data for determining and monitoring the thermal power input outside the carbon monitoring boundary includes input electricity carbon emissions and input thermal carbon emissions.

[0015] The operational data of the thermal power generation emission sources within the carbon monitoring boundary are determined and monitored, including carbon emissions from fossil fuel combustion, carbon emissions from desulfurization processes, and heat and electricity supply. The carbon emissions from electricity supply and heating supply are derived from the carbon emissions from fossil fuel combustion and desulfurization processes.

[0016] The overall carbon emissions of the park are calculated based on the carbon emissions from input electricity, input heat, electricity supply, and heating.

[0017] The carbon emission intensity of the power supply in the park is derived from the carbon emission of the power supply and the amount of power supplied.

[0018] The carbon emission intensity of the park's heating is determined based on the heating carbon emissions and the heating capacity.

[0019] As a preferred method for low-carbon operation of the aforementioned industrial park's thermal power production system, the formula for calculating the carbon emission intensity of the park's power supply is as follows:

[0020] Igd = Sgd / Egd

[0021] Wherein, Igd represents the carbon emission intensity of power supply in the park, Sgd represents the carbon emission of power supply, and Egd represents the power supply.

[0022] The formula for calculating the carbon emission intensity of heating in the industrial park is as follows:

[0023] Igr = Sgr / Egr

[0024] Where Igr represents the carbon emission intensity of heating in the park, Sgr represents the carbon emission amount of heating, and Egr represents the heat supply.

[0025] As a preferred method for low-carbon operation of the aforementioned industrial park's thermal power production system, the steps of constructing the objective function and setting constraints to solve for the calculated optimal value for low-carbon operation of the industrial park include the following:

[0026] The current electricity and heat load demand is the initial value for calculation. The output power of each device in the thermal power production system is dynamically adjusted based on the historical load curve and the current electricity and heat load demand value to obtain the optimal value for low-carbon operation.

[0027] As a preferred embodiment of the low-carbon operation method for the aforementioned thermal power production system in the industrial park, the objective function includes:

[0028] The objective function A1 is to minimize the overall carbon emissions of the thermal power plant in the park, and the output power design range of each piece of equipment in the thermal power production system is set as the constraint boundary condition.

[0029] As a preferred embodiment of the low-carbon operation method for the aforementioned industrial park's thermal power production system, the step of constructing the objective function and setting constraints to solve for the calculated optimal low-carbon operation value of the industrial park also includes:

[0030] Based on load demand, non-carbon energy equipment in the thermal power production system is prioritized for operation. When the non-carbon energy equipment can meet the demand, there is no need to dynamically calculate and solve the objective function and constraints.

[0031] As a preferred embodiment of the low-carbon operation method for the aforementioned thermal power production system in the industrial park, the steps of constructing a digital twin model of the thermal power production system and obtaining carbon emission data according to the carbon emission data acquisition method include the following steps:

[0032] A model of the park's thermal power production system is constructed using digital twin technology, and dynamic power parameters in the thermal power production system model are obtained using the carbon emission data acquisition method.

[0033] As a preferred method for low-carbon operation of the aforementioned thermal power production system in the industrial park, determining the carbon monitoring boundary of the park includes the following steps:

[0034] The carbon monitoring boundaries of the park are determined based on the park's planning and drawings.

[0035] The beneficial effects of this invention are:

[0036] The low-carbon operation method for the park's thermal power production system proposed in this invention enables the direct online calculation of the carbon emission indicators of the park's thermal power production system, and constructs the optimal low-carbon operation mode that meets the conditions of safety, stability and balance from the perspective of the park's energy system. Attached Figure Description

[0037] Figure 1 This is a flowchart of the low-carbon operation method of the park thermal power production system provided by the present invention;

[0038] Figure 2 This is a modeling diagram of the industrial park thermal power production system provided by the present invention;

[0039] Figure 3 This is a logic diagram of the carbon emission data acquisition method of the thermal power production system constructed in the low-carbon operation method of the thermal power production system in the park provided by the present invention.

[0040] In the picture:

[0041] 1-Boiler, 2-Steam turbine, 3-Desulfurization system, 4-Online flue gas analysis system, 5-Gas storage equipment, 6-Electric power storage equipment, 7-Heat storage equipment, 8-Electric boiler, 9-Waste heat boiler, 10-Distributed photovoltaic system, 11-Electric hydrogen production equipment, 12-Fuel cell;

[0042] Energy and material flows: (1) solid chemical fuels, (2) liquid chemical fuels, (3) gaseous chemical fuels, (4) electrical energy, (5) thermal energy, (8) flue gas;

[0043] Park load: ①-Gas load, ②-Electricity load, ③-Heat load. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0048] like Figure 1 As shown, this embodiment provides a low-carbon operation method for a thermal power generation system in a park, including the following steps:

[0049] S1. Determine the carbon monitoring boundaries of the park.

[0050] The carbon monitoring boundaries of the park should be determined based on the park's planning and drawings. However, determining the carbon monitoring boundaries is not limited to this method; other rules can also be used. If the carbon monitoring boundaries change later, corrective measures should be taken promptly to update the park's carbon monitoring boundaries.

[0051] S2. Methods for obtaining carbon emission data from thermal power generation systems of Jian Energy.

[0052] Methods for acquiring carbon emission data from thermal power generation systems (see [link]) Figure 3 To obtain carbon emission data, the following steps are included:

[0053] The operational data of the thermal power input outside the carbon monitoring boundary are determined and monitored, and the operational data of the thermal power production emission sources inside the carbon monitoring boundary are determined and monitored. Based on the operational data of the thermal power input outside the carbon monitoring boundary and the operational data of the thermal power production emission sources inside the carbon monitoring boundary, the comprehensive carbon emissions of the park, the carbon emission intensity of heating in the park, and the carbon emission intensity of power supply in the park are obtained.

[0054] Furthermore, the operational data of the thermal power generation emission sources within the carbon monitoring boundary are identified and monitored, including carbon emissions from fossil fuel combustion, carbon emissions from desulfurization processes, and heat and electricity supply. The carbon emissions from electricity supply and heating supply are derived from the carbon emissions from fossil fuel combustion and desulfurization processes.

[0055] The overall carbon emissions of the park are calculated based on the carbon emissions from input electricity, input heat, electricity supply, and heating.

[0056] The carbon emission intensity of power supply in the park is determined based on the carbon emissions from power supply and the amount of power supplied.

[0057] The carbon emission intensity of the park's heating system is determined based on the amount of carbon emissions from heating and the amount of heat supplied.

[0058] The carbon emission data acquisition methods described above are used to derive the park's overall carbon emissions, carbon emission intensity for power supply, and carbon emission intensity for heating, which can then be applied to the subsequent objective function.

[0059] Specifically, identifying and monitoring operational data for thermoelectric inputs outside the carbon monitoring boundary includes monitoring readings recorded by metering instruments installed by the supply unit for electricity, steam, and hot water, including data such as electricity, heat, flow rate, pressure, and temperature.

[0060] Identifying and monitoring operational data of thermal power generation emission sources within the carbon monitoring boundary includes the following monitoring contents:

[0061] (1) Within the carbon monitoring boundary, major production systems such as power generation boilers, industrial boilers, start-up boilers, and gas turbines that consume fossil fuels, as well as biomass power generation units that co-fire fossil fuels and waste and sludge incineration power generation units. Monitor the amount of fossil fuels consumed in the furnace and the corresponding elemental carbon content; monitor the steam and water operating parameters in the boiler and turbine reheat systems.

[0062] (2) For combined heat and power equipment, it is necessary to focus on monitoring all externally supplied steam, hot water and system makeup water, including corresponding pressure, temperature and flow data.

[0063] (3) If coal is used for combustion, the carbon dioxide emissions from the flue gas desulfurization process should be considered, and the consumption of carbonates should be monitored.

[0064] (4) Conduct real-time monitoring of organized emissions sites. The main monitoring data include the pressure, temperature, humidity, and flow rate of the flue gas at the emission outlet.

[0065] For the aforementioned input electricity carbon emissions, the carbon emissions are calculated based on the electricity volume and the electricity emission factor, and this is taken as the input electricity carbon emissions. For steam and hot water input from outside the boundary, if there is no direct heat measurement data, the input heat is calculated using data such as flow rate, pressure, and temperature, and the carbon emissions are calculated using the thermal emission factor, which is taken as the input thermal carbon emissions.

[0066] For the thermal power production processes and equipment within the above boundaries, calculate the carbon emissions of the fossil fuel combustion process and the desulfurization process, as well as the heat and electricity supply. Based on whether it is a pure electricity production process, classify and sum the carbon emissions of the fossil fuel combustion process and the desulfurization process to obtain the carbon emissions of electricity supply and heat supply respectively.

[0067] Based on the carbon emissions from input electricity, input heat, power supply, and heating calculated above, the total carbon emissions of the park are summed to calculate the total carbon emissions.

[0068] The formula for calculating the carbon emission intensity of power supply in the industrial park is as follows:

[0069] Igd = Sgd / Egd

[0070] Wherein, Igd represents the carbon emission intensity of power supply in the park, Sgd represents the carbon emission of power supply, and Egd represents the power supply.

[0071] The formula for calculating the carbon emission intensity of heating in the industrial park is as follows:

[0072] Igr = Sgr / Egr

[0073] Where Igr represents the carbon emission intensity of heating in the park, Sgr represents the carbon emission amount of heating, and Egr represents the heat supply. The carbon emission intensity of electricity supply and the carbon emission intensity of heating in the park are calculated using the above formulas.

[0074] Online monitoring equipment at emission outlets calculates carbon dioxide emissions by converting flue gas parameters, serving as an auxiliary means to verify the calculated values ​​of carbon emissions from power supply and heating.

[0075] S3. Construct a digital twin model of the thermal power production system and obtain carbon emission data according to the carbon emission data acquisition method.

[0076] Based on digital twin technology, the thermal power production system is modeled, and dynamic parameters within the model are identified and acquired. The model of the park's thermal power production system includes condensing turbines, cogeneration units, and various self-owned power generation / heating boilers, distributed photovoltaic systems, hydrogen production via electricity, fuel cells, gas / electricity / heat storage equipment, as well as the thermal networks, power networks, and natural gas networks between each unit, equipment, and heat and electricity loads. Dynamic power parameters include the output power of each unit and equipment, as well as various heat and electrical loads.

[0077] like Figure 2 As shown, in this embodiment, the modeling of the park's thermal power system includes the following equipment: 1-boiler, 2-steam turbine, 3-desulfurization system, 4-flue gas online analysis system, 5-gas storage equipment, 6-electricity storage equipment, 7-thermal storage equipment, 8-electric boiler, 9-waste heat boiler, 10-distributed photovoltaic system, 11-hydrogen production equipment, 12-fuel cell. The park's load demand types mainly include ①-gas load, ②-electricity load, and ③-heat load.

[0078] During combustion, boiler 1 consumes one or more of the following: (1) solid chemical fuel, (2) liquid chemical fuel, and (3) gaseous chemical fuel. The chemical energy of the fuel is converted into the (5) thermal energy of superheated steam. This superheated steam continues to perform work in turbine 2, converting it into (4) electrical energy. Some superheated steam can also be extracted from turbine 2 and supplied, thus achieving combined heat and power (CHP). The (8) flue gas after combustion in boiler 1 contains a large amount of carbon dioxide and various pollutants. For coal-fired boilers, the flue gas after combustion needs to enter a desulfurization system to remove sulfur dioxide, while simultaneously generating new carbon dioxide emissions. The treated (8) flue gas enters the discharge port, and flue gas composition data is obtained through an online flue gas analysis system.

[0079] 8-Electric boiler, 9-Waste heat boiler, 10-Distributed photovoltaic, 11-Electric hydrogen production equipment, 12-Fuel cell provide clean energy for the park without generating carbon emissions during the energy production process.

[0080] The ①-gas load, ②-electricity load, and ③-heat load required by the park are supplied by input from outside the park or by production within the park. When the supply exceeds the demand, they are stored using 5-gas storage equipment, 6-electricity storage equipment, and 7-heat storage equipment, respectively. When the supply is less than the demand, they are released to meet the corresponding load requirements.

[0081] The thermal power production system of the industrial park was modeled using digital twin technology. Digital twin technology fully utilizes data from physical models, sensor updates, and operational history, integrating multi-disciplinary, multi-physical-quantity, multi-scale, and multi-probabilistic simulation processes to complete mapping in virtual space, thereby reflecting the entire lifecycle of the corresponding physical equipment. Digital twin modeling is an existing technology and will not be elaborated upon here.

[0082] S4. Construct the objective function and set constraints, and solve for the optimal low-carbon operation value of the park based on the load demand.

[0083] Specifically, the current electricity and heat load demand is used as the initial value for calculation. The output power of each piece of equipment in the cogeneration system is dynamically adjusted based on the historical load curve and the current electricity and heat load demand value in order to obtain the optimal value for low-carbon operation.

[0084] The objective function includes objective function A1, which aims to minimize the overall carbon emissions from the park's thermal power plant. The resulting operating data represents the optimal value for low-carbon operation.

[0085] Objective function A1:

[0086] A1=∑ i ∑ j (AD ij ×EF ij );

[0087] In the formula,

[0088] A1 – Total carbon dioxide emissions from the park;

[0089] AD ij —The activity level of the j-th production process of the i-th type of equipment in the park;

[0090] EF ij —Emission factors of the j-th production process of the i-th type of equipment in the industrial park;

[0091] The optimal operating value is generated through dynamic calculation and solution based on the objective function A1 model described above. The activity level of the j-th production process of the i-th type of equipment in the park is positively correlated with the equipment's output power. Based on the current electricity and heat load demand of the park, assuming the output power of each carbon-containing thermal power production equipment within the park, the activity level of the j-th production process of the i-th type of equipment is obtained and used as the initial value for calculation. The carbon emissions of each piece of equipment and the overall carbon emissions of the park's thermal power generation are then calculated. The initial value for the next period is adjusted based on the calculation results of the previous period. Through dynamic calculation and continuous optimization of the solution process, the current optimal operating value is obtained, i.e., the single objective function A is minimized. The output power of each carbon-containing thermal power production equipment corresponding to the calculation results is then sent to the control system of each carbon-containing thermal power production equipment as the operating target value.

[0092] Preferably, before constructing the objective function and setting constraints to solve for the calculated optimal value for low-carbon operation of the park, the following steps are also included:

[0093] Based on load demand, non-carbon energy equipment in the thermal power generation system should be prioritized for operation. When the non-carbon energy equipment can meet the demand, dynamic calculation and solution through objective functions and constraints are unnecessary. When the output power of the non-carbon energy equipment in the park cannot meet the park's demand, the purchase of electricity and heat from outside the park needs to be considered. If both purchased electricity and heat cannot meet the park's demand, the activation of various carbon-containing thermal power generation equipment within the park should be considered, and its operation should be finely adjusted according to the dynamic changes in the park's load.

[0094] The invention proposes a low-carbon operation method for industrial park thermal power production systems, which solves the problem of online direct calculation of carbon emission indicators for industrial park thermal power production systems, and constructs an optimal low-carbon operation mode that meets the conditions of safety, stability and balance from the perspective of industrial park energy system.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A low-carbon operation method for a thermal power production system in an industrial park, characterized in that, Includes the following steps: Determine the carbon monitoring boundaries of the industrial park; A method for acquiring carbon emission data from a thermal power production system within the carbon monitoring boundary is proposed. A digital twin model of the thermal power production system is constructed, and carbon emission data is obtained according to the carbon emission data acquisition method. Construct an objective function and set constraints, then solve for the optimal low-carbon operation value of the park based on load demand. The method for acquiring carbon emission data from a thermal power production system within the carbon monitoring boundary includes the following steps: Determine and monitor operational data for thermoelectric inputs outside the carbon monitoring boundary; Identify and monitor the operational data of thermal power generation emission sources within the carbon monitoring boundary; Based on the operational data obtained above, the park's overall carbon emissions, heating carbon emission intensity, and power supply carbon emission intensity were calculated. Before constructing the objective function and setting constraints to solve for the calculated optimal value for low-carbon operation of the park, the following steps are also included: Based on load demand, non-carbon energy equipment in the thermal power production system is prioritized for operation. When the non-carbon energy equipment can meet the demand, there is no need to dynamically calculate and solve the objective function and constraints. The operational data for determining and monitoring the thermoelectric input outside the carbon monitoring boundary includes input electricity carbon emissions and input thermal carbon emissions; The operational data of the thermal power generation emission sources within the carbon monitoring boundary are determined and monitored, including carbon emissions from fossil fuel combustion, carbon emissions from desulfurization processes, and heat and electricity supply. The carbon emissions from electricity supply and heating supply are derived from the carbon emissions from fossil fuel combustion and desulfurization processes. The overall carbon emissions of the park are calculated based on the carbon emissions from input electricity, input heat, electricity supply, and heating. The carbon emission intensity of the power supply in the park is derived from the carbon emission of the power supply and the amount of power supplied. The carbon emission intensity of the park's heating system is derived from the heating carbon emissions and the heating capacity. The process of constructing the objective function and setting constraints to solve for the calculated optimal value for low-carbon operation of the park includes the following steps: The current electricity and heat load demand is the initial value for calculation. The output power of each piece of equipment in the thermal power production system is dynamically adjusted based on the historical load curve and the current electricity and heat load demand value in order to obtain the optimal value for low-carbon operation. The objective function includes objective function A1, which aims to minimize the overall carbon emissions of the thermal power plant in the park. The output power design range of each piece of equipment in the thermal power production system is set as the constraint boundary condition.

2. The low-carbon operation method for a park thermal power production system according to claim 1, characterized in that, The formula for calculating the carbon emission intensity of power supply in the industrial park is as follows: Igd = Sgd / Egd Wherein, Igd represents the carbon emission intensity of power supply in the park, Sgd represents the carbon emission of power supply, and Egd represents the power supply. The formula for calculating the carbon emission intensity of heating in the industrial park is as follows: Igr=Sgr / Egr Where Igr represents the carbon emission intensity of heating in the park, Sgr represents the carbon emission amount of heating, and Egr represents the heat supply.

3. The low-carbon operation method of the industrial park thermal power production system according to any one of claims 1-2, characterized in that, The steps of constructing a digital twin model of the thermal power production system and obtaining carbon emission data according to the carbon emission data acquisition method include the following: A model of the park's thermal power production system is constructed using digital twin technology, and dynamic power parameters in the thermal power production system model are obtained using the carbon emission data acquisition method.

4. The low-carbon operation method of the industrial park thermal power production system according to any one of claims 1-2, characterized in that, Determining the carbon monitoring boundaries of the park includes the following steps: The carbon monitoring boundaries of the park are determined based on the park's planning and drawings.

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