Configuration and operation optimization method of main power equipment in steam power system under carbon emission reduction background

Abstract

The invention relates to a configuration and operation optimization method for main power equipment in a steam power system under the background of carbon emission reduction. The method comprises the following steps: determining performance parameters of each piece of equipment contained in the steam power system and process parameters of the steam power system; an optimization alternative scheme configured by the main power equipment is generated, and corresponding operation parameters are set for each scheme; generating a mixed integer linear mathematical model; solving the mixed integer linear mathematical model, selecting an optimal main power equipment configuration and operation optimization alternative scheme according to an optimal solution result of the mixed integer linear mathematical model, and if the optimal main power equipment configuration and operation optimization alternative scheme meets the overall performance index of the steam power system, constructing a life cycle carbon emission equation of the main power equipment; and establishing a coupling model with the constructed basic model, solving the coupling model, and obtaining an optimal main power equipment configuration and operation optimization alternative scheme according to the result of the coupling model. According to the method, the carbon emission source range is comprehensively considered, and the system carbon emission can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of steam power technology, and in particular to a method for optimizing the configuration and operation of main power equipment in a steam power system under the background of carbon emission reduction. Background Art

[0002] The primary propulsion equipment (PPE) is the device that provides steam and electricity for the process in a steam power system. Different PPE connection configurations within the steam network are used to meet the needs of the process. Different configurations and operational optimization schemes affect the balance of steam and electricity, which in turn affects the system's cost and carbon emissions. Therefore, optimizing the PPE in a steam power system can effectively reduce the system's carbon emissions.

[0003] Some existing studies have shown that the optimization design of the steam power system is carried out after the main power equipment is fixed in the steam network, but the optimization design of the connection configuration of the main power equipment itself is lacking. Therefore, further improvement of the existing technology is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a configuration and operation optimization method for the main power equipment in the steam power system under the background of carbon emission reduction, which can effectively reduce carbon emissions in response to the above-mentioned existing technologies.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a method for optimizing the configuration and operation of the main power equipment in a steam power system under the background of carbon emission reduction, characterized by being used to find a configuration and operation optimization scheme for the main power equipment with better overall performance or economy under different working conditions from the configuration and operation optimization alternatives of the main power equipment in the steam power system, and the found optimization scheme must meet the overall carbon emission reduction indicators of the steam power system. The optimization method includes the following steps:

[0006] Step 1: Determine the performance parameters of each device included in the steam power system and the process parameters of the steam power system, wherein the devices included in the steam power system include main power equipment to be optimized and main power equipment with fixed configuration;

[0007] Step 2: Generate optimal alternatives for the configuration of the main power equipment based on the steam demand, shaft power demand, and steam pipeline pressure level conditions under different production process conditions, and set corresponding operating parameters for each optimal alternative;

[0008] Step 3: Generate a mixed integer linear mathematical model based on the mass balance equation of each device in the steam power system, the energy balance equation of each device, the mass conservation equation of the entire steam power system, the energy conservation equation of the entire steam power system, the main power equipment configuration scheme selection equation, various operating parameters of the steam power system, the carbon emission equation of the entire steam power system, and the objective function equation;

[0009] Step 4: Solve the mixed integer linear mathematical model, select the optimal main power equipment configuration and operation optimization alternative plan based on the optimal solution of the mixed integer linear mathematical model, and determine whether the optimal main power equipment configuration and operation optimization alternative plan meets the overall performance indicators of the steam power system. If so, proceed to step 5; if not, proceed to step 2;

[0010] Step 5: Construct the life cycle carbon emission equation of the main power equipment, and establish a coupling model with the constructed basic model, solve the coupling model, and obtain the optimal main power equipment configuration and operation optimization alternatives based on the results of the coupling model, and verify whether the optimal main power equipment configuration and operation optimization alternatives meet the overall carbon emission reduction indicators of the steam power system.

[0011] In order to further select alternative solutions with better economy and overall performance, preferably, in step 5, if the optimal main power equipment configuration and operation optimization alternative solutions cannot meet the overall carbon emission reduction indicators of the steam power system, then go to step 2 to regenerate the optimized alternative solutions for the main power equipment configuration.

[0012] Preferably, in the mixed integer linear mathematical model, the objective function equation is:

[0013] COST total =COST oper +COST capt ×f ann

[0014] Among them, COST total is the total cost of the steam power system, COST oper is the total operating cost of the steam power system, represents the total cost of fresh water purchase under working condition S, represents the total cost of fuel consumed by the steam power system under operating condition S, represents the total cost of purchasing steam for the steam power system under operating condition S, represents the total cost of the steam power system purchasing electricity under working condition S, It represents the total cost of adding cooling water supply to the steam power system under working condition S, COST capt is the equipment investment cost, fann is the annualized coefficient.

[0015] In the above solution, the main power equipment to be optimized includes a boiler. In the mixed integer linear mathematical model, the boiler configuration solution selection equation satisfies the following conditions:

[0016]

[0017] Among them, M BLR,S Indicates the amount of boiler fuel used at operating condition S, Q fuel Indicates the calorific value of boiler fuel, Indicates the specific heat of saturated water entering the boiler, ΔT sat_bfw Indicates the saturation temperature difference of boiler feed water, ΔH sat_suh Indicates the specific heat load of steam from superheat temperature to saturation temperature, B BLR and A BLR are coefficients and are constants, Indicates the steam mass flow rate at the boiler outlet at operating condition S, Indicates the maximum flow rate of steam at the maximum outlet of the boiler, Indicates the mass flow rate of boiler sewage at operating condition S, ΔH bd Indicates the enthalpy value of boiler wastewater.

[0018] Furthermore, in the mixed integer linear mathematical model, the boiler configuration scheme selection equation also satisfies the following conditions:

[0019]

[0020] in, represents the total investment cost of boiler purchase, is the steam pressure at the rated outlet of the boiler at operating condition S, Indicates the redundancy of the boiler under operating condition S, Indicates the steam mass flow rate at the rated outlet of the boiler under operating condition S, P unit Indicates the unit conversion value, P USDCNY is the exchange rate of USD to RMB, and a, b, c and d are all constants.

[0021] Furthermore, the main power equipment to be optimized further includes a steam turbine generator. In the mixed integer linear mathematical model, the steam turbine generator configuration scheme selection equation satisfies the following conditions:

[0022]

[0023] Among them, COST STG represents the investment cost of the steam turbine generator, A1, B1, C1 and D1 are all constants, represents the average steam volume flow through the turbine generator under operating condition S, P transform represents the coefficient, It represents the mass flow rate of steam at the outlet of the steam turbine generator under the working condition S, represents the inlet steam specific volume of the steam turbine generator, represents the outlet steam specific volume of the steam turbine generator, Indicates the work done by the steam turbine generator under working condition S, represents the isentropic enthalpy difference of steam at the inlet and outlet of the steam driving machine, B STG and A STG The intercept and slope fixed constants of the turbine design performance, respectively, e represents the regression coefficient of the Aguilar model, Indicates the difference in inlet and outlet steam saturation temperature,

[0024] In the mixed integer linear model, the carbon emission equation of the steam power system as a whole is:

[0025]

[0026] in, represents the total carbon emission cost of the steam power system, represents the total annual CO2 emissions from the steam power system, represents the tax rate on carbon emissions;

[0027] Carbon emissions must meet the following conditions:

[0028]

[0029] Indicates the maximum allowable carbon emissions of the steam power system. The calculation formula is:

[0030]

[0031] Where t represents the operating time of the steam power system in a year, t S represents the operating time of the steam power system under working condition s, Indicates the mass of fuel consumed in the boiler, BLR indicates the boiler equipment set, Indicates the mass of fuel consumed in the waste heat boiler, HRSG represents the waste heat boiler equipment set, q fuel Indicates the calorific value of fuel; CI fuel Represents the carbon emission intensity of the fuel.

[0032] Preferably, the life cycle carbon emission equation of the main power equipment in step 5 is as follows:

[0033]

[0034] in, represents the total carbon emissions from mining, transportation, and combustion of fuel coal for steam power systems. Indicates the carbon emissions generated by mining one kilogram of fuel coal. It represents the carbon emissions generated by using internal combustion engine trucks to transport materials per kilometer and per kilogram; transportfuel Indicates the transportation distance from the fuel coal mining site to the industrial enterprise;

[0035]

[0036] in, represents the total carbon emissions from the extraction and transportation of fresh make-up water under operating condition S, It represents the mass flow rate of fresh feed water entering the deaerator under operating condition S, It represents the carbon emissions generated by each kilogram of fresh replenishment water extracted, P transportmuw Indicates the transportation distance from the extraction site of fresh supply water to the industrial enterprise.

[0037] In the coupled model, the total carbon emissions of the steam power system after adding the life cycle carbon emission equation of the main power equipment The calculation formula is:

[0038]

[0039] in, represents the carbon emissions generated by the purchased electricity of the steam power system under working condition S, represents the total carbon emissions generated by the mining and transportation of steel under working condition S, represents the total carbon emissions generated by the production and transportation of copper under operating condition S;

[0040] The calculation formula is as follows:

[0041]

[0042] Among them, A2, B2 and C2 are all constants. It represents the mass flow rate of boiler outlet steam at operating condition S, Indicates the carbon emissions generated per kilogram of steel produced, P transportsteels Indicates the transportation distance from the steel production site to the industrial enterprise;

[0043] The calculation formula is:

[0044]

[0045] Among them, A3, B3 and C3 are all constants. Indicates the power generation of the steam turbine generator under the corresponding operating condition S, Indicates the carbon emissions generated per kilogram of copper material produced, P transportcopper Indicates the transportation distance from the copper material production site to the industrial enterprise.

[0046] Compared with the existing technology, the advantages of the present invention are: coupling the nonlinear mathematical model with the mixed integer linear mathematical model, while having the flexibility and accuracy to solve complex problems; considering the impact of changes in the equipment configuration structure in the steam power system under different carbon emission reduction requirements, and coupling the life cycle carbon emissions of the main power equipment with the basic model, comprehensively considering the range of carbon emission sources; this optimization method can effectively reduce the system's carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for optimizing the configuration and operation of a main power device in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0049] The purpose of this embodiment is to find a configuration and operation optimization scheme for the main power equipment with better overall performance or economy under different working conditions from the configuration and operation optimization alternatives of the main power equipment in the steam power system, and the optimization scheme found must meet the overall carbon emission reduction indicators of the steam power system.

[0050] like Figure 1 As shown, the configuration and operation optimization method of the main power equipment in the steam power system under the background of carbon emission reduction in this embodiment includes the following steps:

[0051] Step 1: Determine the performance parameters of each device included in the steam power system and the process parameters of the steam power system, wherein the devices included in the steam power system include main power equipment to be optimized and main power equipment with fixed configuration;

[0052] The performance characteristic parameters of each device in this step include the operating load of the device, the operating efficiency of the device, the operating parameters of the device, and other parameters used to characterize the performance of the device. The process parameters of the steam power system are also commonly used process parameters in the steam power industry and are common knowledge and will not be described in detail here. The fixed equipment here includes the boiler, deaerator, steam pipe network and other equipment in the steam power system.

[0053] Step 2: Generate optimal alternatives for the configuration of the main power equipment based on the steam demand, shaft power demand, and steam pipeline pressure level conditions under different production process conditions, and set corresponding operating parameters for each optimal alternative;

[0054] Step 3: Generate a mixed integer linear mathematical model based on the mass balance equation of each device in the steam power system, the energy balance equation of each device, the mass conservation equation of the entire steam power system, the energy conservation equation of the entire steam power system, the main power equipment configuration scheme selection equation, various operating parameters of the steam power system, the carbon emission equation of the entire steam power system, and the objective function equation;

[0055] In the mixed integer linear mathematical model, the objective function equation is:

[0056] COST total =COST oper +COST capt ×f ann

[0057] Among them, COST total is the total cost of the steam power system, COST oper is the total operating cost of the steam power system, represents the total cost of fresh water purchase under working condition S, represents the total cost of fuel consumed by the steam power system under operating condition S, represents the total cost of purchasing steam for the steam power system under operating condition S, represents the total cost of the steam power system purchasing electricity under working condition S, It represents the total cost of adding cooling water supply to the steam power system under working condition S, COST capt is the equipment investment cost, f ann is the annualized coefficient;

[0058] The main power equipment to be optimized includes boilers and steam turbine generators. In the mixed integer linear mathematical model, the boiler configuration selection equation satisfies the following conditions:

[0059]

[0060] Among them, M BLR,S Indicates the amount of boiler fuel used at operating condition S, Q fuel Indicates the calorific value of boiler fuel, Indicates the specific heat of saturated water entering the boiler, ΔT sat_bfw Indicates the saturation temperature difference of boiler feed water, ΔH sat_suh Indicates the specific heat load of steam from superheat temperature to saturation temperature, B BLRand A BLR are coefficients and are constants, Indicates the steam mass flow rate at the boiler outlet at operating condition S, Indicates the maximum flow rate of steam at the maximum outlet of the boiler, Indicates the mass flow rate of boiler sewage at operating condition S, ΔH bd Indicates the enthalpy of boiler wastewater;

[0061] In the mixed integer linear mathematical model, the boiler configuration scheme selection equation also satisfies the following conditions:

[0062]

[0063] in, represents the total investment cost of boiler purchase, is the steam pressure at the rated outlet of the boiler at operating condition S, Indicates the redundancy of the boiler under operating condition S, Indicates the steam mass flow rate at the rated outlet of the boiler under operating condition S, P unit Indicates the unit conversion value, P USDCNY is the exchange rate of USD to RMB, a, b, c and d are all constants; in this embodiment, a=0.249,b=47.19,c=3.29,d=624.6,P unit =1000;

[0064] In the mixed integer linear mathematical model, the steam turbine generator configuration selection equation satisfies the following conditions:

[0065]

[0066] Among them, COST STG represents the investment cost of the steam turbine generator, A1, B1, C1 and D1 are all constants, represents the average steam volume flow through the turbine generator under operating condition S, P transform represents the coefficient, It represents the mass flow rate of steam at the outlet of the steam turbine generator under the working condition S, represents the inlet steam specific volume of the steam turbine generator, represents the outlet steam specific volume of the steam turbine generator, Indicates the work done by the steam turbine generator under working condition S, represents the isentropic enthalpy difference of steam at the inlet and outlet of the steam driving machine, B STG and A STG The intercept and slope fixed constants of the turbine design performance, respectively, e represents the regression coefficient of the Aguilar model, Indicates the difference in inlet and outlet steam saturation temperature,

[0067] In this embodiment, A1=474.5, B1=1111.7, C1=0.0414, D1=190.49; P transform =10 / 36;

[0068] In the mixed integer linear model, the carbon emission equation of the steam power system as a whole is:

[0069]

[0070] in, represents the total carbon emission cost of the steam power system, represents the total annual CO2 emissions from the steam power system, represents the tax rate on carbon emissions;

[0071] Carbon emissions must meet the following conditions:

[0072]

[0073] Indicates the maximum allowable carbon emissions of the steam power system. The calculation formula is:

[0074]

[0075] Where t represents the operating time of the steam power system in a year, t S represents the operating time of the steam power system under working condition s, Indicates the mass of fuel consumed in the boiler, BLR indicates the boiler equipment set, Indicates the mass of fuel consumed in the waste heat boiler, HRSG represents the waste heat boiler equipment set, q fuel Indicates the calorific value of fuel; CI fuel Represents the carbon emission intensity of the fuel;

[0076] Step 4: Solve the mixed integer linear mathematical model, select the optimal main power equipment configuration and operation optimization alternative plan based on the optimal solution of the mixed integer linear mathematical model, and determine whether the optimal main power equipment configuration and operation optimization alternative plan meets the overall performance indicators of the steam power system. If so, proceed to step 5; if not, proceed to step 2;

[0077] Step 5: Construct a lifecycle carbon emission equation for the main power equipment and establish a coupling model with the constructed basic model. Solve the coupling model and, based on the results of the coupling model, obtain the optimal main power equipment configuration and operation optimization alternatives. Verify whether the optimal main power equipment configuration and operation optimization alternatives meet the overall carbon emission reduction indicators of the steam power system.

[0078] The constructed basic model in this embodiment is a conventional model in the configuration and operation optimization method of the main power equipment in the prior art, and will not be further described here;

[0079] Considering equipment lifecycle carbon emissions can more realistically reflect the system's overall carbon emissions and more comprehensively reflect the impact of the active power configuration optimization process on the system's total carbon emissions and total costs. Lifecycle carbon emissions are calculated for materials such as boiler fuel coal and deaerator feed water, as well as steel and copper used in boiler and steam turbine generator manufacturing, from mining to transportation (cradle to gate).

[0080] The life cycle carbon emission equation of main power equipment is as follows:

[0081]

[0082] in, represents the total carbon emissions from mining, transportation, and combustion of fuel coal for steam power systems. Indicates the carbon emissions generated by mining one kilogram of fuel coal. It represents the carbon emissions generated by using internal combustion engine trucks to transport materials per kilometer and per kilogram; transportfuel Indicates the transportation distance from the fuel coal mining site to the industrial enterprise;

[0083]

[0084] in, represents the total carbon emissions from the extraction and transportation of fresh make-up water under operating condition S, It represents the mass flow rate of fresh feed water entering the deaerator under operating condition S, It represents the carbon emissions generated by each kilogram of fresh replenishment water extracted, P transportmuw Indicates the transportation distance of fresh supply water from the extraction site to the industrial enterprise;

[0085] The present invention does not impose rigid specifications on the size and model of boilers and steam turbine generators, therefore establishing a general linear relationship between boiler size and weight is necessary. By reviewing the specific equipment specifications and weight data for boilers and steam turbine generators from widely used and representative manufacturers of relevant equipment, a corresponding equation and linear relationship were derived using linear regression. Based on this linear relationship standard, the specifications of the main power equipment in the system were used as variables to calculate the standard weight of the equipment, providing basic data for the subsequent lifecycle carbon emissions calculations during the equipment manufacturing and transportation processes.

[0086] The total carbon emissions of boilers and turbine generators within the cradle-to-gate life cycle assessment are calculated by multiplying the calculated weight of raw materials and equipment by the carbon emissions per kilogram per kilometer.

[0087] In the coupled model, the total carbon emissions of the steam power system after adding the life cycle carbon emission equation of the main power equipment The calculation formula is:

[0088]

[0089] in, represents the carbon emissions generated by the purchased electricity of the steam power system under working condition S, represents the total carbon emissions generated by the mining and transportation of steel under working condition S, represents the total carbon emissions generated by the production and transportation of copper under operating condition S;

[0090] The calculation formula is as follows:

[0091]

[0092] Among them, A2, B2 and C2 are all constants. It represents the mass flow rate of boiler outlet steam at operating condition S, Indicates the carbon emissions generated per kilogram of steel produced, P transportsteels Indicates the transportation distance from the steel production site to the industrial enterprise;

[0093] The calculation formula is:

[0094]

[0095] Among them, A3, B3 and C3 are all constants. Indicates the power generation of the steam turbine generator under the corresponding operating condition S, Indicates the carbon emissions generated per kilogram of copper material produced, P transportcopper Indicates the transportation distance from the copper material production site to the industrial enterprise.

[0096] In step 5, if the optimal main power equipment configuration and operation optimization alternatives cannot meet the overall carbon emission reduction indicators of the steam power system, then go to step 2 to regenerate the optimization alternatives for the main power equipment configuration.

[0097] It should be pointed out that the units of variables and parameters listed in the above formula descriptions are only examples. Ordinary technicians in the relevant field should pay attention to the unit conversion problem in the calculation process when applying the above method.

[0098] The following is an example of a real factory to illustrate the steam power system modeling method of the present invention:

[0099] The steam power system parameters for this plant example are as follows: it primarily includes four steam main stages (VHP, HP, MP, and LP), two extraction-condensing steam turbine generator sets, and three coal-fired boilers. The system has nine mechanical power requirements, requiring optimization of the configuration and operation of the main power equipment with the goal of minimizing carbon emissions while meeting these requirements. Table 1 shows the steam power system's energy requirements for mechanical power, electricity, and steam under various operating conditions. Table 2 shows the thermodynamic parameters of each steam main stage. Table 3 shows raw material pricing data for each operating condition.

[0100] Table 1 Energy demand parameters under various working conditions

[0101]

[0102] Table 2 Physical parameters of steam network

[0103]

[0104] Table 3 Price data under various working conditions

[0105]

[0106] In this embodiment, the configuration and operation optimization design of the main power equipment of the steam power system under the background of carbon emission reduction are compared with the configuration and operation optimization of the main power equipment of the steam power system when carbon emission reduction is not considered. Then, the configuration and operation optimization of the main power equipment under the life cycle carbon emissions of the main power equipment are introduced for comparison. The differences in various system costs under the three scenarios are shown in Tables 4 and 5.

[0107] Table 4 Comparison of various investment costs under different optimization scenarios

[0108]

[0109] Table 5 Comparison of various costs before and after optimization

[0110]

[0111] Comparing the data in Tables 4 and 5, we find that the optimized configuration and operational design of the steam power system's main power equipment, in the context of carbon emission reduction, resulted in a modest increase in annual total operating costs, but both system investment and total costs decreased. Total carbon emissions were effectively reduced, with a carbon reduction ratio of 36.18%. Overall electricity costs increased, but fuel and circulating fresh water costs decreased to a certain extent.

[0112] The optimal design of the steam power system, taking into account lifecycle carbon emissions, resulted in a modest increase in annual total operating costs, while further reducing system investment costs. Electricity costs increased, but fuel and circulating fresh water costs decreased to a certain extent. Carbon emissions were further reduced, reaching a 37.12% reduction.

[0113] According to the design schemes under three different scenarios, the number and specifications of the connected boilers and steam turbine generators in the main power equipment have changed, and the relevant parameters of other equipment such as steam drive engines, electric motors, temperature and pressure reduction, and steam main pipes have also changed accordingly. In the context of carbon emission reduction, the present invention takes into account the investment costs of boilers and steam turbine generators, and further considers the life cycle carbon emissions of the main power equipment manufacturing materials and the system's fresh water and fuel coal. By optimizing the specifications and number of main power equipment, the system investment cost is greatly reduced. The present invention reduces the self-generated power of the overall system's steam turbine generators and uses external power purchases instead, thereby reducing the system's demand for boiler steam production, and further reducing the boiler's use of fossil fuels, achieving the goal of reducing total carbon emissions.

[0114] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for optimizing the configuration and operation of main power equipment in a steam power system under the background of carbon emission reduction, characterized in that: The optimization method is used to find the configuration and operation optimization scheme of the main power equipment with better overall performance or economy under different working conditions from the configuration and operation optimization alternative schemes of the main power equipment in the steam power system, and the optimization scheme found must meet the overall carbon emission reduction index of the steam power system. The optimization method includes the following steps: Step 1: determining the performance parameters of each device included in the steam power system and the process parameters of the steam power system, wherein the various devices included in the steam power system include the main power equipment to be optimized and the main power equipment with fixed configuration; Step 2: Generate optimal alternatives for the configuration of the main power equipment according to the steam demand, shaft power demand and pressure level conditions of the steam pipeline under different working conditions of the production process, and set corresponding operating parameters for each optimal alternative; Step 3: Generate a mixed integer linear mathematical model based on the mass balance equation of each device in the steam power system, the energy balance equation of each device, the mass conservation equation of the steam power system as a whole, the energy conservation equation of the steam power system as a whole, the main power equipment configuration scheme selection equation, various operating parameters of the steam power system, the carbon emission equation of the steam power system as a whole, and the objective function equation; Step 4, solving the mixed integer linear mathematical model, selecting the optimal main power equipment configuration and operation optimization alternative scheme according to the optimal solution result of the mixed integer linear mathematical model, and judging whether the optimal main power equipment configuration and operation optimization alternative scheme meet the overall performance index of the steam power system, if yes, proceeding to step 5; if no, proceeding to step 2; Step 5: Construct the life cycle carbon emission equation of the main power equipment, and establish a coupling model with the constructed basic model, solve the coupling model, and obtain the optimal main power equipment configuration and operation optimization alternatives based on the results of the coupling model, and verify whether the optimal main power equipment configuration and operation optimization alternatives meet the overall carbon emission reduction indicators of the steam power system.

2. The method for optimizing the configuration and operation of the main power equipment in the steam power system under the background of carbon emission reduction according to claim 1, characterized in that: If the optimal main power equipment configuration and operation optimization alternatives in step 5 cannot meet the overall carbon emission reduction index of the steam power system, then go to step 2 to regenerate the optimization alternatives for the main power equipment configuration.

3. The method for optimizing the configuration and operation of the main power equipment in the steam power system under the background of carbon emission reduction according to claim 2 is characterized in that: In the mixed integer linear mathematical model, the objective function equation is: COST total =COST oper +COST capt ×f ann Among them, COST total is the total cost of the steam power system, COST oper is the total operating cost of the steam power system, represents the total cost of fresh water purchase under operating condition S, represents the total cost of fuel consumed by the steam power system under operating condition S, represents the total cost of purchasing steam for the steam power system under operating condition S, represents the total cost of purchasing electricity from the steam power system under operating condition S, represents the total cost of adding cooling water to the steam power system under operating condition S, COST capt is the equipment investment cost, f ann is the annualized coefficient.

4. The method for optimizing the configuration and operation of main power equipment in a steam power system under the background of carbon emission reduction according to claim 3, characterized in that: The main power equipment to be optimized includes a boiler. In the mixed integer linear mathematical model, the boiler configuration scheme selection equation satisfies the following conditions: Among them, M BLR,S Indicates the amount of boiler fuel used at operating condition S, Q fuel Indicates the calorific value of boiler fuel, Indicates the specific heat of saturated water entering the boiler, ΔT sat_bfw Indicates the saturation temperature difference of boiler feed water, ΔH sat_suh It represents the specific heat load of steam from superheat temperature to saturation temperature, B BLR and A BLR are coefficients and are constants, It represents the steam mass flow rate at the boiler outlet at operating condition S, Indicates the maximum flow rate of the boiler's maximum outlet steam. Indicates the mass flow rate of boiler wastewater at operating condition S, ΔH bd Indicates the enthalpy of boiler wastewater.

5. The method for optimizing the configuration and operation of the main power equipment in the steam power system under the background of carbon emission reduction according to claim 4, characterized in that: In the mixed integer linear mathematical model, the boiler configuration scheme selection equation also satisfies the following conditions: in, represents the total investment cost of boiler purchase, is the steam pressure at the rated outlet of the boiler at operating condition S, represents the redundancy of the boiler under operating condition S, Indicates the steam mass flow rate at the rated outlet of the boiler under operating condition S, P unit Indicates the unit conversion value, P USDCNY is the exchange rate of USD to RMB, a, b, c and d are all constants.

6. The method for optimizing the configuration and operation of the main power equipment in the steam power system under the background of carbon emission reduction according to claim 5, characterized in that: The main power equipment to be optimized also includes a steam turbine generator. In the mixed integer linear mathematical model, the steam turbine generator configuration scheme selection equation satisfies the following conditions: Among them, COST STG represents the investment cost of the steam turbine generator, A1, B1, C1 and D1 are all constants, represents the average steam volume flow through the steam turbine generator under operating condition S, represents the coefficient, represents the mass flow rate of steam at the outlet of the steam turbine generator under operating condition S, represents the specific volume of steam at the inlet of the turbine generator, represents the outlet steam specific volume of the steam turbine generator, Indicates the work done by the steam turbine generator under working condition S, represents the isentropic enthalpy difference of steam at the inlet and outlet of the steam driving machine, B STG and A STG The intercept and slope fixed constants of the turbine design performance, respectively, e represents the regression coefficient of the Aguilar model, Indicates the difference in inlet and outlet steam saturation temperature, 7. The method for optimizing the configuration and operation of main power equipment in a steam power system under the background of carbon emission reduction according to claim 6, characterized in that: In the mixed integer linear model, the carbon emission equation of the steam power system as a whole is: in, represents the total carbon emission cost of the steam power system, represents the total annual carbon dioxide emissions from steam power systems, represents the tax rate on carbon emissions; Carbon emissions need to meet the following conditions: Indicates the maximum allowable carbon emissions of the steam power system. The calculation formula is: Where t represents the operating time of the steam power system in a year, t S represents the operating time of the steam power system under operating condition s, Indicates the mass of fuel consumed in the boiler, BLR indicates the boiler equipment set, It represents the mass of fuel consumed in the waste heat boiler, HRSG represents the waste heat boiler equipment set, q fuel Indicates the calorific value of fuel; CI fuel Represents the carbon emission intensity of the fuel.

8. The method for optimizing the configuration and operation of main power equipment in a steam power system under the background of carbon emission reduction according to claim 7, characterized in that: The life cycle carbon emission equation of the main power equipment in step 5 is as follows: in, Represents the total carbon emissions from mining, transporting, and burning coal, the fuel for the steam power system. Indicates the carbon emissions generated by mining one kilogram of fuel coal. It represents the carbon emission generated by using internal combustion engine trucks to transport materials per kilometer and per kilogram; transportfuel It indicates the transportation distance from the fuel coal mining site to the industrial enterprise; in, represents the total carbon emissions from the extraction and transportation of fresh make-up water under condition S, It represents the mass flow rate of fresh feed water entering the deaerator under operating condition S, represents the carbon emissions per kilogram of fresh replenishment water produced, P transportmuw Indicates the transportation distance from the extraction site of fresh replenishment water to the industrial enterprise.

9. The method for optimizing the configuration and operation of main power equipment in a steam power system under the background of carbon emission reduction according to claim 8, characterized in that: In the coupled model, the total carbon emissions of the steam power system after adding the life cycle carbon emission equation of the main power equipment The calculation formula is: in, represents the carbon emissions generated by purchasing electricity from the steam power system under operating condition S, represents the total carbon emissions generated by the mining and transportation of steel under working condition S, represents the total carbon emissions generated by the production and transportation of copper under operating condition S; The calculation formula is as follows: Among them, A2, B2 and C2 are all constants. It represents the mass flow rate of steam at the boiler outlet at operating condition S, Indicates the carbon emissions generated by producing one kilogram of steel, P transportsteels Indicates the transportation distance from the steel production site to the industrial enterprise; The calculation formula is: Among them, A3, B3 and C3 are all constants. represents the power generation of the steam turbine generator under the corresponding operating condition S, Indicates the carbon emissions generated by producing one kilogram of copper material, P transportcopper Indicates the transportation distance from the copper material production site to the industrial enterprise.

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