Energy-based thermal power cost calculation method, system, device and storage medium

Abstract

The present invention discloses a method, system, device and storage medium for calculating thermal power cost based on energy quality. The method includes obtaining the thermodynamic parameters and environmental parameters of each extraction point from the boiler outlet to the steam turbine exhaust port; establishing a functional relationship between exergy value and energy quality according to the thermodynamic parameters and environmental parameters of each extraction point; integrating the established functional relationship between exergy value and energy quality to obtain the total energy quality of unit heating extraction steam in the steam turbine and the total energy quality of unit steam power generation process; respectively calculating the total energy quality of the heating extraction steam heating process and the total energy quality of the steam power generation process, bringing them into the thermoelectricity allocation ratio formula, and calculating the thermoelectricity allocation ratio; calculating the coal cost consumed for supplying unit heat and the coal cost consumed for generating unit electricity according to the real-time coal price and the obtained thermoelectricity allocation ratio. According to the amount of steam energy consumed in producing heat and electricity, a reasonable allocation explanation of heat and electricity costs is given to guide the actual heat and electricity pricing.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoelectric cost analysis, and in particular to a thermoelectric cost calculation method, system, device and storage medium based on energy products. Background Art

[0002] In the thermal power cost accounting technology, the original thermal power allocation methods include: heat and electricity allocation methods include heat method, actual enthalpy drop method, work capacity method, thermal power combined method (weighted method), conversion method, The following heat and electricity distribution methods do not take reheating into consideration, and the reheating part can be added to the total heat consumption part according to the distribution method.

[0003] As for the heat method, the heat method is a method of allocating heat and electrical heat consumption based on the first law of thermodynamics. This method only considers the change in energy quantity, but does not consider the difference in energy quality.

[0004] Q gr(h) =D gr (h gr -h hs )

[0005] Where:

[0006] Q gr(h) —The amount of heat distributed for heating, unit: kJ.

[0007] h gr —Enthalpy of heating extraction steam, unit: kJ / kg;

[0008] h gs —Enthalpy of feed water, unit: kJ / kg;

[0009] The heat and electricity sharing ratio β is:

[0010]

[0011] For the actual enthalpy drop method, the actual enthalpy drop method calculates the difference between the extraction steam enthalpy value and the turbine exhaust enthalpy of the combined heat and power unit, and distributes the total heat consumption based on the ratio of the actual enthalpy drop of the new steam. The following is the heat consumption distribution without considering reheating:

[0012]

[0013] Where: h b —Exhaust enthalpy of steam turbine, kJ / kg.

[0014] The heat and electricity sharing ratio β is:

[0015]

[0016] For the work capacity method: the work capacity method allocates Q according to the ratio of the maximum work capacity of the cogeneration heating steam and the main steam. gr(h) of:

[0017]

[0018] Where:

[0019] E gr —The maximum working capacity of heating steam, unit: kJ / kg;

[0020] E zq —Maximum work capacity of main steam, unit: kJ / kg;

[0021]

[0022] in:

[0023] E gr =e gr -e en =(h gr -h en )-T en (s gr -s en )

[0024] E zq =e zq -e en =(h zq -h en )-T en (s zq -s en )

[0025] Where: e zq , e gr , e en — respectively for main steam, heating steam, reheat steam, and expansion ratio to ambient temperature Unit: kJ / kg; s zq ,s gr ,s en —Specific entropy of main steam, heating steam, reheat steam, and expansion to ambient temperature, unit: kJ / kgK;

[0026] The combined heat and power method (i.e. weighted method) is a relatively new method. This method believes that neither all the heat is effective (i.e. in the heat method) nor is it completely ineffective (i.e. in the work capacity method). The more reasonable heat and power sharing ratio should be between the heat method and the work capacity method. According to the idea of ​​the combined heat and power method, the heat and power sharing ratio can be constructed:

[0027]

[0028] Where: is a coefficient between 0 and 1. When , it is equivalent to the calorimetric method; when , it is equivalent to the functional capacity method.

[0029] For the conversion Law

[0030] In the actual utilization of heat, the role of fire is not completely ineffective, and some fire plays a positive role. Therefore, in order to reasonably determine the heat-electricity sharing ratio, the contribution of this part of the available fire must be considered. Defined as the ratio of available energy (energy that works) to actual energy sum.

[0031] Unit working fluid conversion The expression is:

[0032]

[0033] Where:

[0034] m—unit working fluid conversion, unit: kJ / kg;

[0035] k—proportional coefficient, i.e., the ratio of unit fire to unit fire e is the ratio of the total value in the process of use;

[0036] Ω—Energy quality coefficient, defined as unit The ratio of e to unit energy q.

[0037]

[0038] D gr ——Heating steam volume; m gr ——Heating conversion Quantity; D zq ——main steam volume; e zq ——Main steam quantity.

[0039] In summary, the existing technology has the following defects:

[0040] The heat method only allocates heat consumption from the perspective of heat quantity utilization, without considering the difference in heat quality, and attributes the benefits to electricity (there is no heat loss from cold sources in the power generation part). It cannot mobilize the enthusiasm for improving the heat-to-work conversion process, and is not conducive to encouraging heat users to reduce heat parameters.

[0041] The actual enthalpy drop method is the benefit-to-heat method. Since the electricity price includes the cold source loss and other irreversible losses while the heat price does not, the benefit-to-heat method, although taking into account the difference in thermal energy quality, does not share the cold source loss and irreversible loss in the heat-to-work conversion process in the heating part.

[0042] The functional capacity method fails to fully consider the intrinsic relationship between the quality of energy products and production costs.

[0043] There are uncertain factors in the selection of weighted coefficients of the combined heat and power method in actual application, and there is no definite and reasonable basis.

[0044] Convert The law considered The contribution made makes energy utilization follow the principle of "energy level matching energy use" ", but the selection of K value is easily affected by subjective factors, and it is difficult to judge its rationality. Summary of the invention

[0045] Therefore, the purpose of the present invention is to provide a method, system, equipment and storage medium for calculating thermal power costs based on energy products, which can provide a reasonable allocation explanation of thermal and electricity costs according to the amount of steam energy products consumed in producing heat and electricity, so as to guide actual thermal and electricity pricing.

[0046] In order to achieve the above object, a method for calculating thermal power cost based on energy products of the present invention comprises the following steps:

[0047] S1. Obtain the thermal parameters and environmental parameters of each steam extraction point from the boiler outlet to the turbine exhaust port;

[0048] S2. According to the thermal parameters and environmental parameters of each extraction point, establish The functional relationship between value and energy quality;

[0049] S3. Establishment The functional relationship between the value and the energy product is calculated by integration to obtain the total energy product of the unit heating extraction steam in the steam turbine and the total energy product of the unit steam power generation process;

[0050] S4. Calculate the total energy product of the heating extraction steam heating process and the total energy product of the steam power generation process respectively, and bring them into the heat and electricity allocation ratio formula to calculate the heat and electricity allocation ratio;

[0051] S5. Calculate the coal cost consumed for supplying unit heat and the coal cost consumed for generating unit electricity based on the real-time coal price and the obtained heat-electricity sharing ratio.

[0052] Further preferably, in S3, the total energy product of the unit heat extraction steam in the steam turbine is calculated by the following method: The value is taken as the starting point, and the heating extraction steam The value is taken as the end point, and the obtained The functional relationship between the value and the energy product is integrated to obtain the total energy product of the unit heating extraction steam in the steam turbine.

[0053] Further preferably, in S3, the total energy product of the unit steam power generation process is calculated by the following method: The value is taken as the starting point, and the turbine inlet The value is taken as the end point, and the obtained The functional relationship between the value and the energy product is integrated to obtain the total energy product of the unit steam power generation process.

[0054] Further preferably, the thermal parameters and environmental parameters of each steam extraction point are established. The functional relationship between the value and the energy product includes the following steps: the thermodynamic parameters and environmental parameters of each extraction point are used to draw a fitting curve through the polyfit function of Matlab: the following equation is obtained through the fitting curve The functional relationship between value and energy quality.

[0055] E x =(h x -h amb )-T amb (s x -s amb )

[0056]

[0057] Where: E x For a certain steam Value, unit: kJ; A x is the energy content of a certain section of steam; h x is the specific enthalpy of a certain section of steam, unit: kJ / kg; s x is the specific entropy of a certain section of steam, unit: kJ / (kg.K); h amb is the specific enthalpy of the environment, unit: kJ / kg; s amb is the specific entropy of the environment, unit: kJ / (kg.K).

[0058] Further preferably, in S5, the heat and electricity sharing ratio is calculated using the following formula:

[0059]

[0060] Among them, β is the heat and electricity sharing ratio, A gr A is the total energy content of the unit heating extraction steam in the steam turbine; e It is the total energy product of the unit steam power generation process.

[0061] The present invention also provides a thermal power cost calculation system based on energy products, which is used to implement the thermal power cost calculation method based on energy products, including a data acquisition module, Value and energy product function model, integral calculation module, heat and electricity sharing ratio calculation module and cost calculation module;

[0062] The data acquisition module is used to obtain the thermal parameters and environmental parameters of each steam extraction point from the boiler outlet to the turbine exhaust port;

[0063] Said The value and energy product function model is used to establish the The functional relationship between value and energy quality;

[0064] The integral calculation module is used to establish The functional relationship between the value and the energy product is calculated by integration to obtain the total energy product of the unit heating extraction steam in the steam turbine and the total energy product of the unit steam power generation process;

[0065] The heat and electricity sharing ratio calculation module is used to calculate the total energy product of the heat extraction steam heating process and the total energy product of the steam power generation process, respectively, and bring them into the heat and electricity sharing ratio formula to calculate the heat and electricity sharing ratio;

[0066] The cost calculation module is used to calculate the coal cost consumed for supplying unit heat and the coal cost consumed for generating unit electricity according to the real-time coal price and the obtained heat-electricity sharing ratio.

[0067] Further preferably, the integral calculation module obtains The functional relationship between the value and the energy product is integrated. When the starting point is the exhaust point of the steam turbine value, the end point is the heating extraction steam When the value is , the total energy product of the unit heating extraction steam in the steam turbine is obtained; the starting point of the integral is adjusted to the exhaust point of the steam turbine. value, the end point is the turbine inlet When the value is obtained The functional relationship between the value and the energy product is integrated to obtain the total energy product of the unit steam power generation process.

[0068] The present invention also provides a device, comprising a memory and a processor, wherein the memory is configured to store one or more computer programs; the processor is coupled to the memory and configured to execute the one or more programs to enable the device to perform the steps of the above-mentioned energy product-based thermal power cost calculation method.

[0069] The present invention also provides a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned method for calculating thermal power cost based on energy products are implemented.

[0070] The energy-based thermal power cost calculation method, system, device and storage medium disclosed in this application have at least the following beneficial effects compared with the prior art:

[0071] 1. This method gives a reasonable explanation for the allocation of heat and electricity costs based on the amount of steam energy consumed in the production of heat and electricity. It only needs to input the thermal parameters of each steam extraction point to allocate the coal consumption cost. The operation is relatively simple and provides a basis for the allocation of the total cost of thermal power, and can further provide guidance for thermal power pricing. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a schematic flow chart of the method for calculating the thermal power cost based on energy products of the present invention;

[0073] Figure 2 A schematic diagram of the steam work and energy conversion process in a cogeneration system provided by an embodiment of the present invention;

[0074] Figure 3 A graph showing the changing trend of energy quality during energy utilization provided by an embodiment of the present invention;

[0075] Figure 4 A graph showing the changing trend of energy quality during the energy utilization process in actual production provided by an embodiment of the present invention;

[0076] Figure 5 A schematic diagram of the change process of steam energy products at different flow rates provided by an embodiment of the present invention;

[0077] FIG6( a ) is a comparison diagram of electricity prices obtained by the apportionment method and other methods in one embodiment of the present invention;

[0078] FIG6( b ) is a comparison diagram of heat prices obtained by the apportionment method and other methods in one embodiment of the present invention;

[0079] FIG6( c ) is a comparison diagram of electricity prices obtained by the apportionment method and other methods in another embodiment of the present invention;

[0080] FIG6( d ) is a comparison chart of heat prices obtained by the apportionment method and other methods in another embodiment of the present invention. DETAILED DESCRIPTION

[0081] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0082] like Figure 1As shown, a method for calculating thermal power cost based on energy products provided by an embodiment of one aspect of the present invention includes the following steps:

[0083] S1. Obtain the thermal parameters and environmental parameters of each steam extraction point from the boiler outlet to the turbine exhaust port;

[0084] S2. According to the thermal parameters and environmental parameters of each extraction point, establish The functional relationship between value and energy quality;

[0085] Furthermore, the thermodynamic parameters and environmental parameters of each steam extraction point are used to draw a fitting curve using the polyfit function of Matlab:

[0086] The following equation is obtained by fitting the curve: Functional relationship between value and energy quality

[0087] E x =(h x -h amb )-T amb (s x -s amb )

[0088]

[0089] Where: E x For a certain steam Value, unit: kJ; A x is the energy content of a certain section of steam; h x is the specific enthalpy of a certain section of steam, unit: kJ / kg; s x is the specific entropy of a certain section of steam, unit: kJ / (kg.K); h amb is the specific enthalpy of the environment, unit: kJ / kg; s amb is the specific entropy of the environment, unit: kJ / (kg.K).

[0090] S3. Establishment The functional relationship between the value and the energy product is calculated by integral calculation to obtain the total energy product of the unit heating extraction steam in the steam turbine and the total energy product of the unit steam power generation process.

[0091] Furthermore, the total energy product of the unit heating extraction steam in the steam turbine is calculated using the following method:

[0092] Based on the exhaust point of steam turbine The value is taken as the starting point, and the heating extraction steam The value is taken as the end point, and the obtained The functional relationship between the value and the energy product is integrated to obtain the total energy product of the unit heating extraction steam in the steam turbine.

[0093] The total energy product of the unit steam power generation process is calculated using the following method:

[0094] Based on the exhaust point of steam turbine The value is taken as the starting point, and the turbine inlet The value is taken as the end point, and the obtained The functional relationship between the value and the energy product is integrated to obtain the total energy product of the unit steam power generation process.

[0095] S4. Calculate the total energy product of the heating extraction steam heating process and the total energy product of the steam power generation process respectively, and bring them into the heat and electricity allocation ratio formula to calculate the heat and electricity allocation ratio;

[0096] The heat and electricity sharing ratio is calculated using the following formula:

[0097]

[0098] Among them, β is the heat and electricity sharing ratio, A gr A is the total energy content of the unit heating extraction steam in the steam turbine; e It is the total energy product of the unit steam power generation process.

[0099] S5. Calculate the coal cost consumed for supplying unit heat and the coal cost consumed for generating unit electricity based on the real-time coal price and the obtained heat-electricity sharing ratio.

[0100] The present invention also provides a thermal power cost calculation system based on energy products, which is used to implement the thermal power cost calculation method based on energy products, including a data acquisition module, Value and energy product function model, integral calculation module, heat and electricity sharing ratio calculation module and cost calculation module;

[0101] The data acquisition module is used to obtain the thermal parameters and environmental parameters of each steam extraction point from the boiler outlet to the turbine exhaust port;

[0102] Said The value and energy product function model is used to establish the The functional relationship between value and energy quality;

[0103] The integral calculation module is used to establish The functional relationship between the value and the energy product is calculated by integration to obtain the total energy product of the unit heating extraction steam in the steam turbine and the total energy product of the unit steam power generation process;

[0104] The heat and electricity sharing ratio calculation module is used to calculate the total energy product of the heat extraction steam heating process and the total energy product of the steam power generation process, respectively, and bring them into the heat and electricity sharing ratio formula to calculate the heat and electricity sharing ratio;

[0105] The cost calculation module is used to calculate the coal cost consumed for supplying unit heat and the coal cost consumed for generating unit electricity according to the real-time coal price and the obtained heat-electricity sharing ratio.

[0106] Further, preferably, the integral calculation module obtains The functional relationship between the value and the energy product is integrated. When the starting point is the exhaust point of the steam turbine value, the end point is the heating extraction steam When the value is obtained, the total energy product of the unit heating extraction steam in the steam turbine is obtained;

[0107] The starting point of the adjustment integral is the exhaust point of the steam turbine. value, the end point is the turbine inlet When the value is obtained The functional relationship between the value and the energy product is integrated to obtain the total energy product of the unit steam power generation process.

[0108] In the embodiments of the energy-based thermal power cost calculation method and calculation system provided by the present invention, as Figure 2 As shown in the figure, the high-quality main steam does work in the turbine. From the high-pressure cylinder, the medium-pressure cylinder to the low-pressure cylinder, the quality of the steam is constantly decreasing. After the reheating section, the quality is restored, and the quality of the steam continues to decrease after the reheating section. Based on cost allocation, the difference in the quality of energy consumed when producing heat and electricity must be considered. Based on this, the concepts of exergy and energy quality and their calculation expressions are introduced.

[0109] Concept and expression

[0110] When a system changes reversibly from an arbitrary state to a state in equilibrium with a given environment, the energy that can theoretically be infinitely converted into any other form of energy is called Also called effective energy. It can be expressed by the following expression:

[0111] E x =QT amb Δs

[0112] Where: Ex—the properties of a substance kJ;

[0113] Q—the total energy of a substance, kJ;

[0114] Tamb - the ambient temperature of a substance, K;

[0115] Δs—the difference in specific entropy between a substance and its environment, kJ / (kg.K)

[0116] The calculation of energy in a cogeneration system can be simplified to the difference in specific enthalpy, namely:

[0117] E x =ΔH-T0Δs

[0118] Where: ΔH—enthalpy change of a substance

[0119] For any micro-element process of steam in the cogeneration system The change expression is:

[0120] dE x =dH-T0ds

[0121] Where: dEx—change in exergy during the infinitesimal process, kJ;

[0122] dH—change in specific enthalpy during the microelement process, kJ;

[0123] ds—Change in specific entropy during the microelement process, kJ / (kg.K)

[0124] The concept and calculation expression of energy grade are as follows:

[0125] It is the part of energy that has the ability to do work. The value of energy is related to the quantity and quality of energy. The grade of energy is used to evaluate the size of the useful function of a certain form of energy. It reflects the quality of energy. It can be used to evaluate both physical energy and chemical energy. It is defined as the proportion of exergy contained in unit energy:

[0126]

[0127] Where: A—energy grade, dimensionless coefficient

[0128] E—unit energy, kJ;

[0129] For the infinitesimal process:

[0130]

[0131] like Figure 3 As shown in the figure, it is a trend chart of energy quality changes in the process of energy utilization under ideal conditions. In actual industry, multiple steam extractions are required. The present invention determines the energy quality of steam consumed in the process of power generation and heating by the change of steam parameters from the boiler outlet to the steam turbine exhaust port, and then determines the thermal power sharing ratio. Taking the common steam extraction and heat recovery unit as the application object, the change process of steam energy quality in the steam turbine can be judged according to the parameters of each steam extraction point. Figure 4 .

[0132] The heat-electricity sharing ratio of the present invention is the ratio of the energy content of steam consumed in producing thermoelectric products.

[0133]

[0134] Figure 4 It is a schematic diagram of the change process of steam energy quality under different flow rates.

[0135] Total energy product per unit steam power generation process:

[0136] A e =D1A 1,2 +......+D i+1 A i,i+1

[0137] Among them, D1 is the main steam flow; A 1,2 is the energy quality between the first steam extraction port and the second steam extraction port, that is, the energy quality of the first steam extraction node; the corresponding A i,i+1 is the energy quality of the i-th extraction node.

[0138] Total energy content of unit heating extraction steam in the steam turbine:

[0139] A gr =D 0n A n,i+1

[0140] D0n——The amount of heating extraction steam using the nth extraction steam as heating extraction steam.

[0141] Then the heat and electricity sharing ratio β can be obtained as:

[0142]

[0143] The present invention takes a 330MW steam extraction heating reconstruction unit as an example, and uses a Matlab program to calculate the thermal power cost allocation using the energy product allocation method.

[0144] The steam from the boiler outlet to the turbine exhaust port is measured at an ambient temperature of 25°C and 101.325 kPa. Calculation of value and energy quality:

[0145] E x =(h x -h amb )-T amb (s x -s amb )

[0146]

[0147] Where: hx—specific enthalpy of a certain section of steam, kJ / kg; sx—specific entropy of a certain section of steam, kJ / (kg.K);

[0148] Ex—a certain section of steam Value, kJ; Ax—energy quality of a certain section of steam;

[0149] hamb—specific enthalpy of the environment, kJ / kg; samb—specific entropy of the environment, kJ / (kg.K);

[0150] The fitting curve is obtained by the polyfit function of matlab, and the steam energy conversion process is obtained according to the fitting curve. The function between the value and the energy product, and then integrate the steam energy products used for heating and power generation to obtain the energy products per unit steam used for heating and power generation, and finally combine the actual steam flow to obtain the total energy product used for heating and power generation, thereby obtaining the thermal power sharing ratio. At a price of 800 yuan per ton of coal, the cost of supplying unit MW of heat and producing unit MW of electricity can be obtained. The following is the thermal power cost corresponding to different heating parameters.

[0151] In the embodiment shown in FIG. 6 (a) and FIG. 6 (b), the heating steam capacity is 100 t / h, the heating extraction steam parameters are as follows: the pressure is 4.1576 MPa, and the temperature is 267.8798°C.

[0152] In the embodiments shown in FIG. 6( c ) and FIG. 6( d ), the heating steam capacity is 100 t / h, the heating extraction steam parameters are pressure of 52.2031 MPa and temperature of 369.8104°C (which is impossible in practice).

[0153] The heating parameters in the embodiments shown in FIG6(c) and FIG6(d) are impossible to exist in the actual heating process. This article is only to illustrate the sensitivity of the energy quality allocation method to the heating parameters. When low-grade extraction steam is used for heating, the allocated heat price cost is lower than other allocation methods, and the electricity price is higher than other allocation methods; when high-grade extraction steam is used for heating, the allocated heat price cost is only lower than the heat method, and the electricity price is only higher than the heat method. This method only involves the allocation of coal costs, which has shortcomings, but the allocation method based on energy quality associates product prices with energy quality, which is close to real life, that is, the cost of high-quality energy is higher than that of low-quality energy.

[0154] The present invention also provides a device, comprising a memory and a processor, wherein the memory is configured to store one or more computer programs; the processor is coupled to the memory and configured to execute the one or more programs to enable the device to perform the steps of the above-mentioned energy product-based thermal power cost calculation method.

[0155] The present invention also provides a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned method for calculating thermal power cost based on energy products are implemented.

[0156] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A method for calculating thermal power cost based on energy products, characterized in that: The following steps are involved: S1. Obtain the thermal parameters and environmental parameters of each steam extraction point from the boiler outlet to the turbine exhaust port; S2. Establishing a functional relationship between exergy value and energy quality according to the thermodynamic parameters and environmental parameters of each steam extraction point; comprising the following steps: The thermodynamic parameters and environmental parameters of each extraction point are used to draw a fitting curve using Matlab's polyfit function: The functional relationship between exergy value and energy quality is obtained by fitting the curve as follows: Where: E x is the exergy value of a certain section of steam, unit: kJ; A x is the energy content of a certain section of steam; h x is the specific enthalpy of a certain section of steam, unit: kJ / kg; s x is the specific entropy of a certain section of steam, unit: kJ / (kg.K); h amb is the specific enthalpy of the environment, unit: kJ / kg; s amb is the specific entropy of the environment, unit: kJ / (kg.K); S3. Perform integral calculation on the established functional relationship between exergy value and energy product to obtain the total energy product of unit heating extraction steam in the steam turbine and the total energy product of unit steam power generation process; S4. Calculate the total energy product of the heating extraction steam heating process and the total energy product of the steam power generation process respectively, and bring them into the heat and electricity allocation ratio formula to calculate the heat and electricity allocation ratio; S5. Calculate the coal cost consumed for supplying unit heat and the coal cost consumed for generating unit electricity based on the real-time coal price and the obtained heat-electricity sharing ratio.

2. The method for calculating thermal power cost based on energy products according to claim 1, characterized in that: In S3, the total energy product of the unit heating extraction steam in the steam turbine is calculated using the following method: Taking the exergy value of the steam turbine exhaust point as the starting point and the exergy value of the heating extraction steam as the end point, the functional relationship between the obtained exergy value and energy product is integrated to obtain the total energy product of the unit heating extraction steam in the steam turbine.

3. The method for calculating thermal power cost based on energy products according to claim 1, characterized in that: In S3, The total energy product of the unit steam power generation process is calculated using the following method: Taking the exergy value at the exhaust point of the steam turbine as the starting point and the exergy value at the inlet of the steam turbine as the end point, the functional relationship between the exergy value and the energy product is integrated to obtain the total energy product of the unit steam power generation process.

4. The method for calculating thermal power cost based on energy products according to claim 1, characterized in that: In S5, the heat and electricity sharing ratio is calculated using the following formula: Among them, β is the heat and electricity sharing ratio, which is It is the total energy content of the unit heating extraction steam in the steam turbine; It is the total energy product of the unit steam power generation process.

5. A thermal power cost calculation system based on energy products, characterized in that: A method for calculating the thermal power cost based on energy product according to any one of claims 1 to 4, comprising a data acquisition module, an exergy value and energy product function model, an integral calculation module, a thermal power allocation ratio calculation module and a cost calculation module; The data acquisition module is used to obtain the thermal parameters and environmental parameters of each steam extraction point from the boiler outlet to the turbine exhaust port; The exergy value and energy quality function model is used to establish a functional relationship between exergy value and energy quality according to the thermodynamic parameters and environmental parameters of each steam extraction point; The integral calculation module is used to perform integral calculation on the established functional relationship between exergy value and energy product, and obtain the total energy product of unit heating extraction steam in the steam turbine and the total energy product of unit steam power generation process; The heat and electricity sharing ratio calculation module is used to calculate the total energy product of the heat extraction steam heating process and the total energy product of the steam power generation process, respectively, and bring them into the heat and electricity sharing ratio formula to calculate the heat and electricity sharing ratio; The cost calculation module is used to calculate the coal cost consumed for supplying unit heat and the coal cost consumed for generating unit electricity according to the real-time coal price and the obtained heat-electricity sharing ratio.

6. The thermal power cost calculation system based on energy products according to claim 5, characterized in that: The integral calculation module integrates the obtained functional relationship between the exergy value and the energy product, and when the starting point is the exergy value of the steam turbine exhaust point and the end point is the exergy value of the heating extraction steam, the total energy product of the unit heating extraction steam in the steam turbine is obtained; When the starting point of the integral is adjusted to be the exergy value at the exhaust point of the steam turbine and the end point is the exergy value at the inlet of the steam turbine, the functional relationship between the obtained exergy value and the energy product is integrated to obtain the total energy product of the unit steam power generation process.

7. A device, comprising a memory and a processor, wherein the memory is configured to store one or more computer programs; the processor is coupled to the memory and configured to execute the one or more programs to enable the device to perform the steps of the thermal power cost calculation method based on energy products according to any one of claims 1 to 4.

8. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method for calculating thermal power cost based on energy products according to any one of claims 1 to 4.

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