Method and device for calculating carbon capture rate of low-carbon thermal power plant

Abstract

The application discloses a kind of low carbon thermal power plant's carbon capture rate's calculation method and device, the method includes: obtaining the actual plant auxiliary power rate of low carbon thermal power plant and first power generation efficiency, and the power supply efficiency of low carbon thermal power plant is calculated to obtain;Wherein, first power generation efficiency is the power generation efficiency calculated by low carbon thermal power plant without considering carbon capture system;According to output power, power supply efficiency and the cost influence coefficient of low carbon thermal power plant, the daily operating degree electric cost of low carbon thermal power plant is calculated;Wherein, cost influence coefficient is specifically the influence coefficient of carbon capture system on the investment construction cost of low carbon thermal power plant;According to preset constraint condition and daily operating degree electric cost, the actual carbon capture rate of low carbon thermal power plant is calculated in combination with optimization algorithm.The accuracy of calculating the carbon capture rate of low carbon thermal power plant is improved by the embodiment of the application.

Description

Technical Field

[0001] This invention relates to the field of data processing technology, and in particular to a method and apparatus for calculating the carbon capture rate of a low-carbon thermal power plant. Background Technology

[0002] In the existing technology, the calculation method for carbon capture rate of low-carbon thermal power plants does not take into account the changes in plant power consumption caused by the changes in output power during the actual operation of low-carbon thermal power plants. The calculation based solely on a fixed carbon emission factor standard value cannot reflect the actual operating conditions of the unit and does not take into account the high investment costs of introducing carbon capture systems into thermal power plants. Therefore, the calculation method for carbon capture rate of low-carbon thermal power plants has the problem of low accuracy. Summary of the Invention

[0003] This invention provides a method and apparatus for calculating the carbon capture rate of a low-carbon thermal power plant, which improves the accuracy of calculating the carbon capture rate of a low-carbon thermal power plant.

[0004] The first aspect of this application provides a method for calculating the carbon capture rate of a low-carbon thermal power plant, including:

[0005] The actual plant power consumption rate and first power generation efficiency of the low-carbon thermal power plant are obtained, and the power supply efficiency of the low-carbon thermal power plant is calculated; wherein, the first power generation efficiency is the power generation efficiency of the low-carbon thermal power plant without considering the carbon capture system.

[0006] The daily operating cost per kilowatt-hour of a low-carbon thermal power plant is calculated based on output power, power supply efficiency, and cost impact coefficient of the low-carbon thermal power plant. Specifically, the cost impact coefficient is the impact coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant.

[0007] Based on preset constraints and daily operating electricity costs, combined with optimization algorithms, the actual carbon capture rate of low-carbon thermal power plants is calculated.

[0008] In one possible implementation of the first aspect, the daily operating cost per kilowatt-hour of the low-carbon thermal power plant is calculated based on the output power, power supply efficiency, and cost impact coefficient of the low-carbon thermal power plant, specifically as follows:

[0009] Based on the output power, power supply efficiency, and cost impact coefficient of low-carbon thermal power plants, the construction cost of low-carbon thermal power plants is allocated to the operating days, and the daily operating cost per kilowatt-hour of low-carbon thermal power plants is calculated.

[0010] In one possible implementation of the first aspect, the daily operating cost per kilowatt-hour of a low-carbon thermal power plant is calculated as follows:

[0011]

[0012] Where, p eω represents the daily operating cost per kilowatt-hour of a low-carbon thermal power plant; λ represents the operation and maintenance factor; C represents the cost impact coefficient; inv The initial investment cost is represented by m, which represents the total number of generating units in the low-carbon thermal power plant; T represents the total investment cost. i,日运行 T represents the daily operating hours of the i-th thermal power unit; i,年利用 P represents the annual utilization hours of the i-th thermal power unit; t T represents the grid-connected power output of the thermal power plant during the t-th operating period; 日运行 p represents the daily operating hours of the thermal power plant; n represents the economic service life of the thermal power plant; coal For coal prices; η CCS (p total ( ) represents the power supply efficiency of a thermal power plant with a carbon capture system.

[0013] In one possible implementation of the first aspect, the actual carbon capture rate of the low-carbon thermal power plant is calculated based on preset constraints and daily operating electricity costs, combined with an optimization algorithm, specifically as follows:

[0014] The carbon emissions of low-carbon thermal power plants are calculated based on the standard coal consumption and output power of low-carbon thermal power plants.

[0015] The daily operating cost of a low-carbon thermal power plant is calculated based on carbon emissions, and preset constraints are set based on the daily operating cost.

[0016] Based on preset constraints and daily operating electricity costs, and combined with optimization algorithms, the actual carbon capture rate of low-carbon thermal power plants and the optimal carbon trading volume for low-carbon thermal power plants in each time period are calculated.

[0017] In one possible implementation of the first aspect, the actual power consumption rate of the low-carbon thermal power plant is obtained, specifically as follows:

[0018] Obtain the initial carbon capture rate of the low-carbon thermal power plant, and calculate the additional power of the carbon capture system based on the initial carbon capture rate;

[0019] Obtain the output power of the low-carbon thermal power plant, combine it with the additional power, and calculate and obtain the actual plant power consumption rate.

[0020] In one possible implementation of the first aspect, preset constraints are set based on daily operating costs, specifically as follows:

[0021] min f(E t，碳配额交易 );

[0022]

[0023] Wherein, min f(E) t,碳配额交易 ) represents the objective function that minimizes the daily operating cost of a low-carbon thermal power plant; AE t,碳配额交易=0 indicates an equality constraint for the operation of low-carbon thermal power plants; BE t,碳配额交易 ≤0 indicates an inequality constraint for the operation of low-carbon thermal power plants.

[0024] A second aspect of this application provides a calculation device for the carbon capture rate of a low-carbon thermal power plant, comprising: an acquisition module, a first calculation module, and a second calculation module;

[0025] The acquisition module is used to acquire the actual plant power consumption rate and the first power generation efficiency of the low-carbon thermal power plant, and to calculate the power supply efficiency of the low-carbon thermal power plant; wherein, the first power generation efficiency is the power generation efficiency of the low-carbon thermal power plant without considering the carbon capture system.

[0026] The first calculation module is used to calculate the daily operating cost of a low-carbon thermal power plant based on the output power, power supply efficiency, and cost impact coefficient of the low-carbon thermal power plant; wherein, the cost impact coefficient is specifically the impact coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant.

[0027] The second calculation module is used to calculate the actual carbon capture rate of low-carbon thermal power plants based on preset constraints and daily operating electricity costs, combined with optimization algorithms.

[0028] In one possible implementation of the second aspect, the daily operating cost per kilowatt-hour of the low-carbon thermal power plant is calculated based on the output power, power supply efficiency, and cost impact coefficient of the low-carbon thermal power plant, specifically as follows:

[0029] Based on the output power, power supply efficiency, and cost impact coefficient of low-carbon thermal power plants, the construction cost of low-carbon thermal power plants is allocated to the operating days, and the daily operating cost per kilowatt-hour of low-carbon thermal power plants is calculated.

[0030] In one possible implementation of the second aspect, the daily operating cost per kilowatt-hour of a low-carbon thermal power plant is calculated as follows:

[0031]

[0032] Where, p e ω represents the daily operating cost per kilowatt-hour of a low-carbon thermal power plant; λ represents the operation and maintenance factor; C represents the cost impact coefficient; inv The initial investment cost is represented by m, which represents the total number of generating units in the low-carbon thermal power plant; T represents the total investment cost. i,日运行 T represents the daily operating hours of the i-th thermal power unit; i,年利用 P represents the annual utilization hours of the i-th thermal power unit; t T represents the grid-connected power output of the thermal power plant during the t-th operating period; 日运行 p represents the daily operating hours of the thermal power plant; n represents the economic service life of the thermal power plant; coal For coal prices; η CCS (p total( ) represents the power supply efficiency of a thermal power plant with a carbon capture system.

[0033] In one possible implementation of the second aspect, the actual carbon capture rate of the low-carbon thermal power plant is calculated based on preset constraints and daily operating electricity costs, combined with an optimization algorithm. Specifically:

[0034] The carbon emissions of low-carbon thermal power plants are calculated based on the standard coal consumption and output power of low-carbon thermal power plants.

[0035] The daily operating cost of a low-carbon thermal power plant is calculated based on carbon emissions, and preset constraints are set based on the daily operating cost.

[0036] Based on preset constraints and daily operating electricity costs, and combined with optimization algorithms, the actual carbon capture rate of low-carbon thermal power plants and the optimal carbon trading volume for low-carbon thermal power plants in each time period are calculated.

[0037] Compared to existing technologies, this invention provides a method and apparatus for calculating the carbon capture rate of a low-carbon thermal power plant. The method includes: obtaining the actual plant power consumption rate and a first power generation efficiency of the low-carbon thermal power plant, and calculating the power supply efficiency of the low-carbon thermal power plant; wherein the first power generation efficiency is the power generation efficiency calculated by the low-carbon thermal power plant without considering the carbon capture system; calculating the daily operating cost per kilowatt-hour of the low-carbon thermal power plant based on the output power, power supply efficiency, and cost impact coefficient of the low-carbon thermal power plant; wherein the cost impact coefficient is specifically the impact coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant; and calculating the actual carbon capture rate of the low-carbon thermal power plant based on preset constraints and the daily operating cost per kilowatt-hour, combined with an optimization algorithm.

[0038] Its beneficial effects are as follows: In the process of calculating the actual carbon capture rate of a low-carbon thermal power plant, the embodiments of the present invention take into account the influence coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant, and take into account the high investment cost of the thermal power plant after the introduction of the carbon capture system, thus improving the accuracy of calculating the carbon capture rate of the low-carbon thermal power plant.

[0039] Meanwhile, the embodiments of the present invention reflect the changes in coal consumption and plant power consumption of low-carbon power plants with different output power in the process of calculating the actual carbon capture rate of low-carbon power plants, which is more in line with the actual operating conditions of power plant units. Therefore, the calculation of carbon emissions and optimal carbon quotas is more accurate.

[0040] Furthermore, in calculating the actual carbon capture rate of a low-carbon power plant, the embodiments of the present invention can take into account the high cost of currently introduced carbon capture systems and allocate it to each operating day, making the investment cost calculation results of the low-carbon power plant more accurate. Attached Figure Description

[0041] Figure 1This is a flowchart illustrating a method for calculating the carbon capture rate of a low-carbon thermal power plant according to an embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram of the evolution curve of daily operating costs of a thermal power plant provided in one embodiment of the present invention;

[0043] Figure 3 This invention provides a schematic diagram of the optimal carbon quota trading volume for a low-carbon thermal power plant during 24 time periods within a single operating day, as provided in one embodiment.

[0044] Figure 4 This is a schematic diagram of the structure of a carbon capture rate calculation device for a low-carbon thermal power plant provided in an embodiment of the present invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Reference Figure 1 This is a flowchart illustrating a method for calculating the carbon capture rate of a low-carbon thermal power plant according to an embodiment of the present invention, including steps S101-S103:

[0047] S101: Obtain the actual plant power consumption rate and first power generation efficiency of the low-carbon thermal power plant, and calculate the power supply efficiency of the low-carbon thermal power plant.

[0048] The first power generation efficiency is the power generation efficiency calculated for low-carbon thermal power plants without considering carbon capture systems.

[0049] In this embodiment, obtaining the actual power consumption rate of the low-carbon thermal power plant specifically involves:

[0050] Obtain the initial carbon capture rate of the low-carbon thermal power plant, and calculate the additional power of the carbon capture system based on the initial carbon capture rate;

[0051] The output power of the low-carbon thermal power plant is obtained, and the actual plant power consumption rate is calculated and obtained by combining the additional power.

[0052] In one specific embodiment, the calculation process of the actual plant power consumption rate can be expressed by the following formula:

[0053] W CCS =P CCS Δt=εE CCS ;

[0054] Ptotal =P+P CCS ;

[0055] β(P total )=τ(P total )×β 标准值 ;

[0056]

[0057] Among them, W CCS Additional energy consumed by the carbon capture system, in kWh; P CCS Power consumed by the carbon capture system, in kW; Δt is the operating time of the carbon capture system, in hours; ε is the power consumed per unit of CO2 captured, in kWh / g; P total P represents the total actual output power of all generator units in the plant, in kW; P represents the total power supplied to the grid by all generator units in the plant, in kW; β(P) total ) represents the plant power consumption rate of a thermal power plant; τ(P) total ) represents the actual plant power consumption rate, which is the ratio of the actual plant power consumption rate under various operating conditions to the standard value under standard operating conditions; β 标准值 b1 to b5 are the standard values ​​of the plant power consumption rate under standard operating conditions of thermal power plants; b1 to b5 are polynomial fitting coefficients.

[0058] The basic data of low-carbon thermal power plants are stored in the low-carbon thermal power plant information database. Specifically, a power meter is configured on the busbar connecting the low-carbon thermal power plant to the external power grid to obtain the output power of the low-carbon thermal power plant in real time and upload it to the system's real-time database; the initial investment cost of the thermal power plant, the impact coefficient of the carbon capture system on the investment and construction cost of the thermal power plant, the standard value of coal consumption rate, the standard value of plant power consumption rate, and the power generation efficiency without considering the carbon capture system are input and set in the computing platform through the terminal human-machine interface, and the above data are stored in the low-carbon thermal power plant information database.

[0059] S102: Calculate the daily operating cost of a low-carbon thermal power plant based on its output power, power supply efficiency, and cost impact coefficient.

[0060] Specifically, the cost impact coefficient refers to the impact coefficient of the carbon capture system on the investment and construction costs of low-carbon thermal power plants.

[0061] In this embodiment, the calculation of the daily operating cost per kilowatt-hour of the low-carbon thermal power plant based on the output power, the power supply efficiency, and the cost impact coefficient of the low-carbon thermal power plant is specifically as follows:

[0062] Based on the output power, the power supply efficiency, and the cost impact coefficient of the low-carbon thermal power plant, the construction cost of the low-carbon thermal power plant is allocated to the operating days, and the daily operating cost of the low-carbon thermal power plant is calculated.

[0063] In one specific embodiment, the calculation of the daily operating cost per kilowatt-hour of the low-carbon thermal power plant is specifically as follows:

[0064]

[0065] Where, p e The daily operating cost per kilowatt-hour of the low-carbon thermal power plant is expressed in yuan / kWh; ω is the operation and maintenance factor; λ is the cost impact coefficient; C inv The initial investment cost is expressed in RMB 100 million; m represents the total number of generating units in the low-carbon thermal power plant; T i,日运行 T represents the daily operating hours of the i-th thermal power unit, in hours (h). i,年利用 P represents the annual utilization hours of the i-th thermal power unit, in hours (h). t T represents the grid-connected power output of the thermal power plant during the t-th operating period; 日运行 p represents the daily operating hours of the thermal power plant, in hours (h); n represents the economic service life of the thermal power plant; p coal The price is for coal, in yuan / ton; η CCS (p total ( ) represents the power supply efficiency of a thermal power plant with a carbon capture system.

[0066] S103: Based on preset constraints and daily operating electricity cost, combined with optimization algorithms, the actual carbon capture rate of low-carbon thermal power plants is calculated.

[0067] In this embodiment, the actual carbon capture rate of the low-carbon power plant is calculated based on preset constraints and the daily operating electricity cost, combined with an optimization algorithm. Specifically:

[0068] The carbon emissions of the low-carbon power plant are calculated based on the coal consumption standard value and the output power of the low-carbon power plant.

[0069] The daily operating cost of the low-carbon thermal power plant is calculated based on the carbon emissions, and the preset constraints are set based on the daily operating cost.

[0070] Based on the preset constraints and the daily operating electricity cost, and combined with the optimization algorithm, the actual carbon capture rate of the low-carbon thermal power plant and the optimal carbon trading volume of the low-carbon thermal power plant in each time period are calculated.

[0071] Furthermore, the actual carbon capture rate of the low-carbon power plant is input as a variable into the optimization model, and the result obtained directly from solving the model is included in the objective function. The calculation process of the actual carbon capture rate of the low-carbon power plant as a variable is as follows:

[0072]

[0073] Where α is the actual carbon capture rate of the entire low-carbon thermal power plant; E all The carbon dioxide emissions generated by the low-carbon thermal power plant, in g; E t,碳配额交易 The carbon quota trading volume for low-carbon thermal power plants is expressed in grams. The optimal actual carbon capture rate can be obtained based on the carbon quota trading volume calculated from the optimization results.

[0074] In one specific embodiment, an optimization objective of minimizing the daily operating cost of a low-carbon thermal power plant is set through a terminal human-machine interface, and preset constraints are set based on the daily operating cost. Specifically, the constraints are:

[0075] min f(E t，端配额交易 );

[0076]

[0077] Wherein, min f(E) t,碳配额交易 ) represents the objective function that minimizes the daily operating cost of the low-carbon thermal power plant; AE t,碳配额交易 =0 indicates the equation constraint for the operation of the low-carbon thermal power plant; BE t,碳配额交易 ≤0 indicates an inequality constraint for the operation of low-carbon thermal power plants.

[0078] In one specific embodiment, the carbon emissions of the low-carbon power plant, calculated based on the coal consumption standard value and the output power, can be expressed by the following formula:

[0079] F(P)=f(P)×F 标准值 ;

[0080]

[0081]

[0082] E CCS =αE all ;

[0083] E = E all -E CCS ;

[0084] Where F(P) is the unit's coal consumption per kilowatt-hour, in g / kWh; P is the total power supplied to the grid by all units in the plant (i.e., the output power), in kW; F 标准值 Here, f(P) represents the standard coal consumption value for the low-carbon power plant, in g / kWh (kW); f(P) is the specific coal consumption for power supply, i.e., the ratio of the actual coal consumption per kilowatt-hour of the unit under various operating conditions to the standard value under standard operating conditions; a1 to a5 are polynomial fitting coefficients; E all The figure represents the carbon dioxide emissions generated by the low-carbon thermal power plant, in grams; 1 represents the calculation period for CO2 emissions per hour; 44 represents the relative molecular mass of CO2; 12 represents the standard relative molecular mass of C; α represents the carbon capture rate of the entire thermal power plant; E CCS The captured carbon dioxide emissions are expressed in grams; E represents the actual carbon emissions of the low-carbon power plant (i.e., the carbon emissions of the aforementioned low-carbon power plant), expressed in grams.

[0085] Furthermore, in a carbon trading market environment, the carbon trading cost of low-carbon thermal power plants is calculated by combining their actual carbon emissions and carbon quotas, as specifically expressed as follows:

[0086] (1) Carbon quota allocation:

[0087]

[0088]

[0089] Among them, E 年目标减排量 The annual target emission reduction for thermal power plants is equivalent to the allocated carbon allowance deficit, in grams; У represents the proportion of carbon allowances issued free of charge; m is the total number of generating units in the thermal power plant; S i E represents the capacity of the i-th generating unit in a thermal power plant, in kW. 日目标减排量 The daily target emission reduction for thermal power plants, in g; T i,年利用 e represents the annual utilization hours of the i-th generating unit in a thermal power plant, in hours (h). i T represents the baseline value for power supply to the i-th generating unit in a thermal power plant, characterizing the carbon dioxide emission intensity of that unit, in g / kWh. i,日运行 E represents the daily operating hours of the i-th generating unit in a thermal power plant, in hours (h). t,碳配额交易 The carbon allowance trading volume for the thermal power plant during the t-th operating period, in g; E t,CCS This represents the total amount of carbon dioxide captured by the thermal power plant during the t-th operating period, in grams.

[0090] (2) Carbon trading costs:

[0091]

[0092] Among them, C碳交易 Carbon trading costs for thermal power plants, unit: yuan; E t,碳配额交易 Carbon emission allowances purchased / sold by a thermal power plant during the t-th operating period, in tons (t); p t,碳配额交易 The carbon trading price is the amount of carbon emission allowances purchased / sold by the thermal power plant during the t-th operating period, expressed in yuan / t.

[0093] Furthermore, the calculation process for the optimal carbon trading volume of the low-carbon thermal power plant in each time period is as follows:

[0094]

[0095]

[0096] Wherein, min f(E) t,碳配额交易 ) represents the objective function that minimizes the daily operating cost of the low-carbon thermal power plant; AE t,碳配额交易 =0 indicates the equation constraint for the operation of the low-carbon thermal power plant; BE t,碳配额交易 ≤0 represents the inequality constraint for the operation of low-carbon thermal power plants. The optimal carbon trading volume for the low-carbon thermal power plants in each time period can be obtained by solving the problem using an optimization algorithm.

[0097] Furthermore, the calculated carbon capture rate of the low-carbon thermal power plant is sent to the adsorption reactor of the carbon capture system to achieve flexible adjustment of the carbon capture rate.

[0098] In a preferred embodiment, the calculation process of the carbon capture rate of a low-carbon thermal power plant is explained with reference to specific data.

[0099] Step 1: Real-time acquisition of relevant operational information and parameters of the low-carbon thermal power plant, including actual output power, overall carbon capture rate, initial investment cost, and the impact coefficient of the carbon capture system on the investment and construction cost of the thermal power plant; storage and integration of relevant data information:

[0100] Consider a low-carbon thermal power plant with two 1000MW supercritical units. The annual utilization hours of the two units are 4500h each, and the daily operating hours are set at 24h. The daily operating hours of the thermal power plant are 24h.

[0101] The actual operating parameters of low-carbon thermal power plants are shown in Table 1:

[0102]

[0103] Table 1: Actual Operating Parameters of Low-Carbon Thermal Power Plants

[0104] Table 2 shows relevant operational information and parameters such as the initial investment cost of other thermal power plants and the impact coefficient of carbon capture systems on the investment and construction costs of thermal power plants.

[0105]

[0106] Table 2: Relevant Operating Information and Parameters

[0107] Step Two: Calculate the additional power of the carbon capture system based on the carbon capture rate of the low-carbon power plant. Substitute the actual output power of the low-carbon power plant into the additional power-plant power consumption rate relationship function to calculate the actual plant power consumption rate of the low-carbon power plant. Furthermore, combine this with the power generation efficiency without considering the carbon capture system to calculate the power supply efficiency of the low-carbon power plant.

[0108] F(P)=f(P)×F 标准值 ;

[0109]

[0110] Where F(P) is the unit's coal consumption per kilowatt-hour, in g / kWh; P is the total power supplied to the grid by all units in the plant, in kW; P CCS The power consumed by the carbon capture system is expressed in kW; f(P) is the specific coal consumption for power supply, which is the ratio of the actual coal consumption of the unit under various operating conditions to the standard value under standard operating conditions, set at 283 g / kWh; a1 to a5 are polynomial fitting coefficients.

[0111] Table 3 shows the relevant operational test data for the 1000MW supercritical unit:

[0112]

[0113] Table 3: Relevant Operation and Testing Data of 1000MW Supercritical Units

[0114] The fitted values ​​are: a1 = 0.6692; a2 = 0.4360; a3 = 3.4733; a4 = 2.3589; a5 = 1.6513.

[0115]

[0116] Among them, E all The carbon dioxide emissions generated by the low-carbon thermal power plant are expressed in g; 1 represents the calculation period for CO2 emissions per hour; 44 represents the relative molecular mass of CO2; and 12 represents the standard relative molecular mass of C.

[0117] E CCS =αE all ;

[0118] E = E all -E CCS ;

[0119] Where α is the carbon capture rate of the entire thermal power plant; E CCSThe captured carbon dioxide emissions are expressed in grams; E represents the actual carbon emissions of the low-carbon power plant (i.e., the carbon emissions of the aforementioned low-carbon power plant), expressed in grams.

[0120] Considering the additional power consumed by the carbon capture system, the actual power consumption rate of a low-carbon thermal power plant is calculated, specifically expressed as follows:

[0121] W CCS =P CCS Δt=εE CCS ;

[0122] P total =P+P CCS ;

[0123] W CCS =P CCS Δt=εE CCS ;

[0124] P total =P+P CCS ;

[0125] β(P total )=τ(P total )×β 标准值 ;

[0126]

[0127] Among them, W CCS Additional energy consumed by the carbon capture system, in kWh; P CCS Power consumed by the carbon capture system, in kW; Δt is the operating time of the carbon capture system, in hours; ε is the power consumed per unit of CO2 captured, in kWh / g; P total P represents the total actual output power of all generator units in the plant, in kW; P represents the total power supplied to the grid by all generator units in the plant, in kW; β(P) total ) represents the plant power consumption rate of a thermal power plant; τ(P) total ) represents the actual plant power consumption rate, which is the ratio of the actual plant power consumption rate under various operating conditions to the standard value under standard operating conditions, and is set to 5.35%; β 标准值 b1 to b5 are the standard values ​​of the plant power consumption rate under standard operating conditions of thermal power plants; b1 to b5 are polynomial fitting coefficients.

[0128] Table 4 shows the relevant operational test data for the 1000MW supercritical unit:

[0129]

[0130] Table 4: Relevant data on operation and testing of 1000MW supercritical units

[0131] The fitted values ​​are: b1 = 4.6021; b2 = 15.5055; b3 = 20.4581; b4 = 13.1740; b5 = 4.6185.

[0132] If we assume the power generation efficiency of a thermal power plant, without considering the carbon capture system, is η = 45%, then the power supply efficiency of the thermal power plant can be expressed as:

[0133] η(P) = [1 - β(P)] × 45%;

[0134]

[0135] Where, η CCS (p total ( ) represents the power supply efficiency of a thermal power plant with a carbon capture system.

[0136] Step 3: Based on the actual output and supply power of the low-carbon power plant, and by allocating the investment and construction costs of the low-carbon power plant with carbon capture technology to the operating days, calculate the daily operating cost per kilowatt-hour of the low-carbon power plant:

[0137] Considering the operation and maintenance costs, fuel costs, and investment costs of low-carbon thermal power plants, and allocating the investment costs of low-carbon thermal power plants to operating days, the daily operating cost per kilowatt-hour of low-carbon thermal power plants is calculated, specifically expressed as follows:

[0138]

[0139] Where, p e ω is the daily operating cost per kilowatt-hour of the low-carbon thermal power plant; λ is the operation and maintenance factor; C is the cost impact coefficient; inv The initial investment cost is m; the total number of generating units in the low-carbon thermal power plant is m; T i,日运行 T represents the daily operating hours of the i-th thermal power unit; i,年利用 P represents the annual utilization hours of the i-th thermal power unit; t T represents the grid-connected power output of the thermal power plant during the t-th operating period; 日运行 p represents the daily operating hours of the thermal power plant; n represents the economic service life of the thermal power plant; coal For coal prices; η CCS (p total ( ) represents the power supply efficiency of a thermal power plant with a carbon capture system.

[0140] Step 4: In the carbon trading market environment, calculate the minimum daily operating cost of low-carbon thermal power plants based on their carbon trading costs. Set an objective function to minimize the daily operating cost of low-carbon thermal power plants, and solve it using an optimization algorithm to obtain the optimal carbon quota trading volume and corresponding carbon capture rate for each operating period. Specifically, this is expressed as follows:

[0141]

[0142]

[0143] Among them, E 年目标减排量 The annual target emission reduction for thermal power plants is equivalent to the allocated carbon allowance deficit, in grams; У represents the proportion of carbon allowances issued free of charge; m is the total number of generating units in the thermal power plant; S i E represents the capacity of the i-th generating unit in a thermal power plant, in kW. 日目标减排量 The daily target emission reduction for thermal power plants, in g; T i,年利用 e represents the annual utilization hours of the i-th generating unit in a thermal power plant, in hours (h). i T represents the baseline value for power supply to the i-th generating unit in a thermal power plant, characterizing the carbon dioxide emission intensity of that unit, in g / kWh. i,日运行 E represents the daily operating hours of the i-th generating unit in a thermal power plant, in hours (h). t,碳配额交易 The carbon allowance trading volume for the thermal power plant during the t-th operating period, in g; E t,CCS This represents the total amount of carbon dioxide captured by the thermal power plant during the t-th operating period, in grams.

[0144] The parameter settings for the power supply baseline value and the proportion of free quota are shown in Table 5:

[0145]

[0146] Table 5: Parameter settings for power supply benchmark and free allowance ratio (2) Carbon trading costs:

[0147]

[0148] Among them, C 碳交易 Carbon trading costs for thermal power plants, unit: yuan; E t,碳配额交易 Carbon emission allowances purchased / sold by a thermal power plant during the t-th operating period, in tons (t); p t,碳配额交易 The carbon trading price is the amount of carbon emission allowances purchased / sold by the thermal power plant during the t-th operating period, expressed in yuan / t.

[0149] With the goal of minimizing the daily operating cost of low-carbon thermal power plants, an optimization algorithm is used to solve the model to obtain the carbon quota trading volume of low-carbon thermal power plants during each operating period on the operating day. This represents the strategy for low-carbon thermal power plants to participate in the carbon trading market, specifically expressed as follows:

[0150]

[0151]

[0152] Wherein, min f(E) t,碳配额交易) represents the objective function that minimizes the daily operating cost of the low-carbon thermal power plant; AE t,碳配额交易 =0 indicates the equation constraint for the operation of the low-carbon thermal power plant; BE t,碳配额交易 ≤0 represents the inequality constraint for the operation of low-carbon thermal power plants. The optimal carbon trading volume for the low-carbon thermal power plant in each time period can be obtained by solving the inequality constraint through optimization algorithm (i.e., the carbon quota trading strategy of the low-carbon thermal power plant in each operating period).

[0153] Using the particle swarm optimization algorithm, with a swarm size of 200 particles and a maximum iteration count of 500, the evolution curve of daily operating costs for thermal power plants and the optimal carbon allowance trading volume for 24 time periods within a single operating day for low-carbon thermal power plants were obtained. Please refer to [reference needed]. Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the evolution curve of daily operating costs of a thermal power plant provided in one embodiment of the present invention. Figure 2 Used to represent the iterative process of the optimization algorithm during the solution process and the number of iterations required for calculation. Figure 3 This invention provides a schematic diagram of the optimal carbon quota trading volume for a low-carbon thermal power plant during 24 time periods within a single operating day, as provided in one embodiment. Figure 3 This represents the optimal carbon allowance trading volume for 24 time periods within a single operating day, obtained using the method described in this paper. Based on this result, the optimal carbon capture rate corresponding to the 24 time periods within a single operating day can be further obtained.

[0154] The results show that considering the introduction of carbon capture technology to coordinate with coal-fired power plants in emission reduction and participation in carbon trading can reduce the daily operating cost of low-carbon coal-fired power plants by approximately 1.92%, as detailed in Table 6.

[0155]

[0156] Table 6: Daily Operating Cost Data of Low-Carbon Thermal Power Plants

[0157] By setting an objective function that minimizes the daily operating cost of low-carbon thermal power plants and considering the constraints of their operation, the optimal carbon trading volume for each time period can be calculated using an optimization algorithm. At the same time, the optimal carbon capture rate for each time period of the corresponding low-carbon thermal power plant can be obtained and adjusted.

[0158] To further explain the calculation device for carbon capture rate in low-carbon power plants, please refer to... Figure 4 , Figure 4 This is a schematic diagram of the structure of a carbon capture rate calculation device for a low-carbon thermal power plant provided in an embodiment of the present invention, including: an acquisition module 401, a first calculation module 402, and a second calculation module 403;

[0159] The acquisition module 401 is used to acquire the actual plant power consumption rate and the first power generation efficiency of the low-carbon thermal power plant, and calculate the power supply efficiency of the low-carbon thermal power plant; wherein, the first power generation efficiency is the power generation efficiency of the low-carbon thermal power plant calculated without considering the carbon capture system.

[0160] The first calculation module 402 is used to calculate the daily operating cost of the low-carbon thermal power plant based on the output power, the power supply efficiency and the cost impact coefficient of the low-carbon thermal power plant; wherein, the cost impact coefficient is specifically the impact coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant;

[0161] The second calculation module 403 is used to calculate the actual carbon capture rate of the low-carbon thermal power plant based on preset constraints and the daily operating electricity cost, combined with an optimization algorithm.

[0162] In this embodiment, the calculation of the daily operating cost per kilowatt-hour of the low-carbon thermal power plant based on the output power, the power supply efficiency, and the cost impact coefficient of the low-carbon thermal power plant is specifically as follows:

[0163] Based on the output power, the power supply efficiency, and the cost impact coefficient of the low-carbon thermal power plant, the construction cost of the low-carbon thermal power plant is allocated to the operating days, and the daily operating cost of the low-carbon thermal power plant is calculated.

[0164] In this embodiment, the calculation of the daily operating cost per kilowatt-hour of the low-carbon thermal power plant is specifically as follows:

[0165]

[0166] Where, p e ω is the daily operating cost per kilowatt-hour of the low-carbon thermal power plant; λ is the operation and maintenance factor; C is the cost impact coefficient; inv The initial investment cost is m; the total number of generating units in the low-carbon thermal power plant is m; T i,日运行 T represents the daily operating hours of the i-th thermal power unit; i,年利用 P represents the annual utilization hours of the i-th thermal power unit; t T represents the grid-connected power output of the thermal power plant during the t-th operating period; 日运行 p represents the daily operating hours of the thermal power plant; n represents the economic service life of the thermal power plant; coal For coal prices; η CCS (p total ( ) represents the power supply efficiency of a thermal power plant with a carbon capture system.

[0167] In one specific embodiment, the actual carbon capture rate of the low-carbon power plant is calculated based on preset constraints and the daily operating electricity cost, combined with an optimization algorithm, specifically as follows:

[0168] The carbon emissions of the low-carbon power plant are calculated based on the coal consumption standard value and the output power of the low-carbon power plant.

[0169] The daily operating cost of the low-carbon thermal power plant is calculated based on the carbon emissions, and the preset constraints are set based on the daily operating cost.

[0170] Based on the preset constraints and the daily operating electricity cost, and combined with the optimization algorithm, the actual carbon capture rate of the low-carbon thermal power plant and the optimal carbon trading volume of the low-carbon thermal power plant in each time period are calculated.

[0171] In one specific embodiment, obtaining the actual power consumption rate of a low-carbon thermal power plant specifically involves:

[0172] Obtain the initial carbon capture rate of the low-carbon thermal power plant, and calculate the additional power of the carbon capture system based on the initial carbon capture rate;

[0173] The output power of the low-carbon thermal power plant is obtained, and the actual plant power consumption rate is calculated and obtained by combining the additional power.

[0174] In one specific embodiment, setting the preset constraint condition based on the daily operating cost specifically includes:

[0175] minf(E t，碳配额交易 );

[0176]

[0177] Wherein, min f(E) t,碳配额交易 ) represents the objective function that minimizes the daily operating cost of the low-carbon thermal power plant; AE t,碳配额交易 =0 indicates the equation constraint for the operation of the low-carbon thermal power plant; BE t,碳配额交易 ≤0 indicates an inequality constraint for the operation of low-carbon thermal power plants.

[0178] In this embodiment of the invention, the actual plant power consumption rate and first power generation efficiency of the low-carbon thermal power plant are obtained by an acquisition module, and the power supply efficiency of the low-carbon thermal power plant is calculated. The first power generation efficiency is the power generation efficiency calculated without considering the carbon capture system. The daily operating cost of the low-carbon thermal power plant is calculated by a first calculation module based on the output power, power supply efficiency, and the cost impact coefficient of the low-carbon thermal power plant. The cost impact coefficient is specifically the impact coefficient of the carbon capture system on the investment and construction costs of the low-carbon thermal power plant. The actual carbon capture rate of the low-carbon thermal power plant is calculated by a second calculation module based on preset constraints and the daily operating cost, combined with an optimization algorithm.

[0179] In calculating the actual carbon capture rate of a low-carbon thermal power plant, this embodiment of the invention considers the impact coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant, taking into account the high investment cost of introducing a carbon capture system into the thermal power plant, thus improving the accuracy of calculating the carbon capture rate of the low-carbon thermal power plant.

[0180] Meanwhile, the embodiments of the present invention reflect the changes in coal consumption and plant power consumption of low-carbon power plants with different output power in the process of calculating the actual carbon capture rate of low-carbon power plants, which is more in line with the actual operating conditions of power plant units. Therefore, the calculation of carbon emissions and optimal carbon quotas is more accurate.

[0181] Furthermore, in calculating the actual carbon capture rate of a low-carbon power plant, the embodiments of the present invention can take into account the high cost of currently introduced carbon capture systems and allocate it to each operating day, making the investment cost calculation results of the low-carbon power plant more accurate.

[0182] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for calculating the carbon capture rate of a low-carbon thermal power plant, characterized in that, include: The actual plant power consumption rate and first power generation efficiency of the low-carbon thermal power plant are obtained, and the power supply efficiency of the low-carbon thermal power plant is calculated; wherein, the first power generation efficiency is the power generation efficiency of the low-carbon thermal power plant calculated without considering the carbon capture system. Based on the output power, the power supply efficiency, and the cost impact coefficient of the low-carbon thermal power plant, the construction cost of the low-carbon thermal power plant is allocated to the operating days to calculate the daily operating cost per kilowatt-hour of the low-carbon thermal power plant; wherein, the cost impact coefficient is specifically the impact coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant; the calculation of the daily operating cost per kilowatt-hour of the low-carbon thermal power plant is specifically as follows: ； in, The daily operating cost per kilowatt-hour of the low-carbon thermal power plant; For operation and maintenance factors; The cost impact coefficient is mentioned above; This refers to the initial investment cost; This refers to the total number of generating units within the low-carbon thermal power plant. T represents the daily operating hours of the i-th thermal power unit; i,年利用 Let i be the annual utilization hours of the i-th thermal power unit; Let t be the power output supplied to the grid by the thermal power plant during the t-th operating period; is the daily operating hours of the thermal power plant; n is the economic service life of the thermal power plant; For coal prices; The power supply efficiency of thermal power plants with carbon capture systems; Based on preset constraints and the daily operating cost per kilowatt-hour, and combined with an optimization algorithm, the actual carbon capture rate of the low-carbon thermal power plant is calculated; wherein, the preset constraints are set by the daily operating cost per kilowatt-hour, specifically as follows: ； ； ； ； ； ； ； ； ； in, The objective function representing the minimum daily operating cost per kilowatt-hour of the low-carbon thermal power plant is: The equation constraints represent the operation of the low-carbon thermal power plant. Inequality constraints representing the operation of low-carbon thermal power plants; The carbon trading cost for thermal power plants is expressed in yuan. Indicates the thermal power plant in the first Carbon emission allowances purchased / sold per operating period, in tons; Indicates the first The price of carbon allowances for a given period; This represents the total actual output power of all generator units in the plant, which can be supplied to the grid. Estimation of plant power consumption rate; Indicates the additional power of the carbon capture system; Indicates the first Carbon dioxide emissions from power generation during a given period; Indicates the actual carbon capture rate; This represents the coal consumption per kilowatt-hour, which is the power supplied to the grid. The function; This indicates the power consumed per unit of carbon dioxide captured; This indicates the power supply efficiency of a thermal power plant with a carbon capture system. This represents the total power supplied to the grid by all generating units in the plant.

2. The method for calculating the carbon capture rate of a low-carbon thermal power plant according to claim 1, characterized in that, The specific steps for obtaining the actual power consumption rate of low-carbon thermal power plants are as follows: Obtain the initial carbon capture rate of the low-carbon thermal power plant, and calculate the additional power of the carbon capture system based on the initial carbon capture rate; The output power of the low-carbon thermal power plant is obtained, and the actual plant power consumption rate is calculated and obtained by combining the additional power.

3. A device for calculating the carbon capture rate of a low-carbon thermal power plant, characterized in that, include: Acquisition module, first calculation module, and second calculation module; The acquisition module is used to acquire the actual plant power consumption rate and the first power generation efficiency of the low-carbon thermal power plant, and calculate the power supply efficiency of the low-carbon thermal power plant; wherein, the first power generation efficiency is the power generation efficiency of the low-carbon thermal power plant calculated without considering the carbon capture system. Based on the output power, the power supply efficiency, and the cost impact coefficient of the low-carbon thermal power plant, the construction cost of the low-carbon thermal power plant is allocated to the operating days to calculate the daily operating cost per kilowatt-hour of the low-carbon thermal power plant; wherein, the cost impact coefficient is specifically the impact coefficient of the carbon capture system on the investment and construction cost of the low-carbon thermal power plant; the calculation of the daily operating cost per kilowatt-hour of the low-carbon thermal power plant is specifically as follows: ； Where, p e ω is the daily operating cost per kilowatt-hour of the low-carbon thermal power plant; λ is the operation and maintenance factor; C is the cost impact coefficient; inv The initial investment cost is m; the total number of generating units in the low-carbon thermal power plant is m; T i,日运行 T represents the daily operating hours of the i-th thermal power unit; i,年利用 P represents the annual utilization hours of the i-th thermal power unit; t T represents the grid-connected power output of the thermal power plant during the t-th operating period; 日运行 p represents the daily operating hours of the thermal power plant; n represents the economic service life of the thermal power plant; coal For coal prices; η CCS (p) total The power supply efficiency of a thermal power plant with a carbon capture system; The second calculation module is used to calculate the actual carbon capture rate of the low-carbon thermal power plant based on preset constraints and the daily operating cost per kilowatt-hour, combined with an optimization algorithm; wherein, the preset constraints are set by the daily operating cost per kilowatt-hour, specifically as follows: ； ； ； ； ； ； ； ； ； in, The objective function representing the minimum daily operating cost per kilowatt-hour of the low-carbon thermal power plant is: The equation constraints represent the operation of the low-carbon thermal power plant. Inequality constraints representing the operation of low-carbon thermal power plants; The carbon trading cost for thermal power plants is expressed in yuan. Indicates the thermal power plant in the first Carbon emission allowances purchased / sold per operating period, in tons; Indicates the first The price of carbon allowances for a given period; This represents the total actual output power of all generator units in the plant, which can be supplied to the grid. Estimation of plant power consumption rate; Indicates the additional power of the carbon capture system; Indicates the first Carbon dioxide emissions from power generation during a given period; Indicates the actual carbon capture rate; This represents the coal consumption per kilowatt-hour, which is the power supplied to the grid. The function; This indicates the power consumed per unit of carbon dioxide captured; This indicates the power supply efficiency of a thermal power plant with a carbon capture system. This represents the total power supplied to the grid by all generating units in the plant.

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