A carbon emission adjustment method and device based on carbon dioxide isotope fingerprint characteristics

Abstract

The application discloses a carbon emission adjustment method and device based on carbon dioxide isotope fingerprint characteristics, and belongs to the technical field of carbon monitoring. The method comprises the following steps: collecting total carbon isotope proportion and total carbon emission in real time; when the type of biomass in the current cycle fuel changes, the similarity between the carbon isotope proportion of the biomass in the previous cycle and the standard value of the carbon isotope proportion of each biomass is calculated to screen candidate biomasses; if there is only one candidate biomass, the standard value of the carbon isotope proportion of the candidate biomass is taken as the carbon isotope proportion of the biomass in the current cycle; if there are multiple candidate biomasses, the standard values of the carbon isotope proportions of the candidate biomasses are weighted and summed to obtain the carbon isotope proportion of the biomass in the current cycle; and then, the fossil fuel carbon emission is calculated based on the carbon isotope proportion of the biomass in the current cycle, and the fuel blending ratio in the next cycle is adjusted. By implementing the application, the problem of low carbon emission monitoring accuracy in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of carbon monitoring technology, and in particular to a method and apparatus for adjusting carbon emissions based on carbon dioxide isotope fingerprint characteristics. Background Technology

[0002] For coal-fired or gas-fired power plants that co-fire biomass, accurate measurement of the electrical carbon factor is particularly crucial. The fuels used in fuel-fired power plants generally include biomass and fossil fuels. The CO2 produced by biomass combustion is usually considered "carbon neutral" and must be deducted from total carbon emissions. Only the electrical carbon factor contributed by fossil fuels is calculated to reflect the true carbon emission intensity of the fuel-fired power plant.

[0003] Currently, the carbon emissions from biomass combustion are primarily calculated based on the blending ratio of the fuel fed into the furnace and the combustion characteristics of the biomass in the fuel. However, this method assumes that the biomass in the fuel remains unchanged. When the type of biomass changes during combustion, its combustion characteristics also change. If the carbon emissions from biomass combustion are still calculated using the default combustion characteristics, it will result in significant carbon emission monitoring errors. Consequently, the blending ratio of the fuel fed into the furnace cannot be adjusted in a timely manner, affecting the power generation efficiency of the fuel-fired power plant. Summary of the Invention

[0004] This invention provides a carbon emission adjustment method and apparatus based on carbon dioxide isotope fingerprint characteristics, which can solve the problem of low accuracy in carbon emission monitoring in the prior art.

[0005] To address the aforementioned technical problems, this invention provides a carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics, comprising: During fuel combustion, the total carbon isotope ratio and total carbon emissions in the emitted flue gas are collected in real time; wherein the fuel includes biomass and fossil fuels; When it is determined that the types of biomass in the fuel change in the current cycle based on the carbon isotope ratio of biomass in the previous cycle, the fuel blending ratio in the current cycle, and the total carbon isotope ratio, the similarity between the carbon isotope ratio of biomass in the previous cycle and the standard value of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database is calculated, and the biomass corresponding to the standard value of the carbon isotope ratio of biomass with a similarity greater than the preset similarity is selected as candidate biomass. When only one candidate biomass exists, the carbon isotope ratio standard value of the candidate biomass is determined as the carbon isotope ratio of the biomass in the current period. When multiple candidate biomass exist, the carbon isotope ratio of the current period biomass is calculated based on the standard value of the carbon isotope ratio of each candidate biomass and the corresponding weighting coefficient. Based on the carbon isotope ratio of biomass in the current cycle, the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio, the carbon emissions of fossil fuels are calculated, and the fuel blending ratio of the fuel power plant in the next cycle is adjusted according to the carbon emissions of fossil fuels.

[0006] As a preferred embodiment, the change in the biomass type in the fuel during the current cycle is determined based on the carbon isotope ratio of the biomass in the previous cycle, the fuel blending ratio in the current cycle, and the total carbon isotope ratio, including: Based on the carbon isotope ratio of biomass in the previous cycle, the fuel blending ratio in the current cycle, and the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, calculate the standard value of the total carbon isotope ratio in the current cycle. Calculate the deviation between the total carbon isotope ratio and the standard value of the total carbon isotope ratio for the current period; When the deviation value is greater than the preset deviation, it is determined that the type of biomass in the fuel of the current cycle has changed.

[0007] As a preferred embodiment, the calculation of the total carbon isotope ratio standard value for the current period based on the carbon isotope ratio of biomass in the previous period, the fuel blending ratio in the current period, and the standard value of fossil fuel carbon isotope ratio in a preset carbon dioxide isotope fingerprint database includes: The current biomass ratio and the current fossil fuel ratio are calculated based on the fuel blending ratio of the current cycle; Based on the carbon isotope ratio of biomass in the previous period, the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, the current biomass proportion, and the current fossil fuel proportion, solve the following equation to obtain the standard value of the total carbon isotope ratio for the current period: In the formula, This is the standard value for the total carbon isotope ratio in the current period; The carbon isotope ratio of biomass from the previous period; This represents the current percentage of biomass. To pre-determine the standard values ​​for the proportion of fossil fuel carbon isotopes in the carbon dioxide isotope fingerprint database; This represents the current percentage of fossil fuels used.

[0008] As a preferred embodiment, the calculation of the similarity between the carbon isotope ratio of the previous period's biomass and the standard values ​​of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database includes: For each standard value of carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, calculate the difference between the carbon isotope ratio of biomass in the previous period and the standard value of carbon isotope ratio of biomass. Calculate the ratio of the difference in the ratio to the carbon isotope ratio of the biomass in the previous period to obtain the relative deviation between the carbon isotope ratio of the biomass in the previous period and the standard value of the carbon isotope ratio of the biomass. Based on the relative deviation value, the similarity between the carbon isotope ratio of the previous period's biomass and the standard value of the carbon isotope ratio of biomass in the preset carbon dioxide isotope fingerprint database is determined.

[0009] As a preferred embodiment, when multiple candidate biomass exist, calculating the carbon isotope ratio of the current period's biomass based on the standard value of the carbon isotope ratio of each candidate biomass and its corresponding weighting coefficient includes: When multiple candidate biomass exist, the weighting coefficient of each candidate biomass is calculated based on the real-time combustion temperature, real-time ambient temperature, and the similarity between the standard value of the carbon isotope ratio of each candidate biomass and the carbon isotope ratio of the biomass in the previous period. Based on the weighting coefficients of each candidate biomass, the standard values ​​of the carbon isotope ratios of each candidate biomass are weighted and summed to obtain the carbon isotope ratios of the biomass in the current period.

[0010] As a preferred embodiment, the step of calculating the weighting coefficient of each candidate biomass based on the real-time combustion temperature, real-time ambient temperature, and the similarity between the standard values ​​of the carbon isotope ratios of each candidate biomass and the carbon isotope ratios of the biomass from the previous period includes: For each candidate biomass, obtain the suitable temperature range and suitable humidity range corresponding to the candidate biomass; The temperature overlap is calculated based on the real-time combustion temperature and the aforementioned suitable temperature range; The humidity overlap is calculated based on the real-time ambient humidity and the specified adaptive humidity range; The working condition fit of the candidate biomass carbon ratio is obtained by weighted summation of the temperature overlap and the humidity overlap. The weighting coefficients for each candidate biomass are calculated based on the working condition suitability of each candidate biomass and the similarity between the standard value of the carbon isotope ratio of the candidate biomass and the carbon isotope ratio of the biomass in the previous period.

[0011] As a preferred option, the weighting coefficients for each candidate biomass are calculated using the following formulas: In the formula, , where is the weighting coefficient for candidate biomass i; The operating condition fit of candidate biomass i; The similarity between the carbon isotope ratios of candidate biomass i and the biomass from the previous period; The number of all candidate biomass.

[0012] As a preferred embodiment, the calculation of fossil fuel carbon emissions based on the carbon isotope ratio of the current periodic biomass, the standard value of the fossil fuel carbon isotope ratio in a preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio includes: Calculate the current cycle biomass based on the carbon isotope ratio of the current cycle biomass. 13 C content and current cycle biomass 12 C content; Fossil fuels are calculated based on the standard values ​​of fossil fuel carbon isotope ratios in a pre-set carbon dioxide isotope fingerprint database. 13 C content and fossil fuels 12 C content; Based on the current cycle of biomass 13 C content, current cycle biomass 12 C content, fossil fuels 13 C content, fossil fuels 12 Using the C content, the total carbon emissions, and the total carbon isotope ratio, solve the following equations to obtain the biomass carbon emissions and fossil fuel carbon emissions: In the formula, For biomass carbon emissions; Carbon emissions from fossil fuels; Total carbon emissions; The percentage of total carbon isotopes; For the current cycle of biomass 13 C content; For the current cycle of biomass 12 C content; fossil fuels 13 C content; fossil fuels 12 C content.

[0013] As a preferred embodiment, adjusting the fuel blending ratio of the fuel power plant for the next cycle based on fossil fuel carbon emissions includes: Collect the power generation of fuel power plants for the current period; The ratio of fossil fuel carbon emissions to the electricity generated by the fuel power plant is defined as the fossil fuel carbon emission factor. Calculate the difference in carbon factor between the stated fossil fuel and the preset standard for carbon factor of fossil fuel; When the difference in the electric carbon factor is greater than a preset difference threshold, the fuel blending ratio for the next cycle is adjusted.

[0014] Compared to existing technologies, this invention provides a carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics. It collects the total carbon isotope ratio and total carbon emissions for the current cycle in real time. Based on the carbon isotope ratio of biomass from the previous cycle, the fuel blending ratio for the current cycle, and the total carbon isotope ratio for the current cycle, it determines whether the biomass type in the fuel has changed. If a change is confirmed, candidate biomass is selected based on the standard values ​​of the carbon isotope ratio of each biomass in a preset carbon dioxide isotope fingerprint database. When only one candidate biomass exists, its carbon isotope ratio standard value is determined as the carbon isotope ratio of the biomass for the current cycle. When multiple candidate biomass exists, the carbon isotope ratio of the biomass for the current cycle is calculated based on the standard values ​​of the carbon isotope ratio of each candidate biomass and their corresponding weighting coefficients. Therefore, the carbon emissions of fossil fuels for the current cycle are calculated based on the carbon isotope ratio of the biomass for the current cycle, allowing for the adjustment of the fuel blending ratio of fuel-fired power plants according to the fossil fuel carbon emissions. This invention determines whether the biomass species in the fuel have changed in the current cycle by comparing the total carbon isotope ratio collected in the current cycle with the carbon isotope ratio of biomass in the previous cycle. When it is determined that the biomass species in the fuel have changed in the current cycle, the carbon isotope ratio of the biomass in the current cycle is calculated based on a preset carbon dioxide isotope fingerprint database. The carbon isotope ratio of the biomass in the current cycle reflects the combustion characteristics of the biomass in the current cycle. Subsequent carbon emission monitoring and adjustments based on the carbon isotope ratio of the biomass in the current cycle can effectively improve the accuracy of carbon emission monitoring, thereby improving the power generation efficiency of fuel power plants.

[0015] Accordingly, the present invention provides a carbon emission adjustment device based on carbon dioxide isotope fingerprint characteristics, comprising: an isotope detection module, a similarity calculation module, a first ratio correction module, a second ratio correction module, and a carbon emission adjustment module; The isotope detection module is used to collect the total carbon isotope ratio and total carbon emissions in the emitted flue gas in real time during fuel combustion; wherein the fuel includes biomass and fossil fuels; The similarity calculation module is used to calculate the similarity between the carbon isotope ratio of biomass in the previous period and the standard value of carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database when the type of biomass in the fuel changes in the current period based on the carbon isotope ratio of biomass in the previous period, the fuel blending ratio in the current period, and the total carbon isotope ratio. Biomass corresponding to the standard value of carbon isotope ratio of biomass with a similarity greater than the preset similarity is selected as candidate biomass. The first ratio correction module is used to determine the carbon isotope ratio standard value of the candidate biomass as the carbon isotope ratio of the biomass in the current period when there is only one candidate biomass. The second ratio correction module is used to calculate the carbon isotope ratio of the current period biomass based on the standard value of the carbon isotope ratio of each candidate biomass and the corresponding weighting coefficient when there are multiple candidate biomass. The carbon emission adjustment module is used to calculate the fossil fuel carbon emissions based on the carbon isotope ratio of biomass in the current cycle, the standard value of fossil fuel carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio, and to adjust the fuel blending ratio of the fuel power plant in the next cycle based on the fossil fuel carbon emissions.

[0016] Compared to existing technologies, this invention provides a carbon emission adjustment device based on carbon dioxide isotope fingerprint characteristics. It collects the total carbon isotope ratio and total carbon emissions for the current cycle in real time. Based on the carbon isotope ratio of biomass from the previous cycle, the fuel blending ratio for the current cycle, and the total carbon isotope ratio for the current cycle, it determines whether the biomass type in the fuel has changed. If a change is confirmed, candidate biomass is selected based on the standard values ​​of the carbon isotope ratio of each biomass in a preset carbon dioxide isotope fingerprint database. When only one candidate biomass exists, its carbon isotope ratio standard value is determined as the carbon isotope ratio of the biomass for the current cycle. When multiple candidate biomass exists, the carbon isotope ratio of the biomass for the current cycle is calculated based on the standard values ​​of the carbon isotope ratio of each candidate biomass and their corresponding weighting coefficients. Therefore, based on the carbon isotope ratio of the biomass for the current cycle, the fossil fuel carbon emissions for the current cycle are calculated, allowing for adjustment of the fuel blending ratio of fuel-fired power plants according to the fossil fuel carbon emissions. This invention determines whether the biomass species in the fuel have changed in the current cycle by comparing the total carbon isotope ratio collected in the current cycle with the carbon isotope ratio of biomass in the previous cycle. When it is determined that the biomass species in the fuel have changed in the current cycle, the carbon isotope ratio of the biomass in the current cycle is calculated based on a preset carbon dioxide isotope fingerprint database. The carbon isotope ratio of the biomass in the current cycle reflects the combustion characteristics of the biomass in the current cycle. Subsequent carbon emission monitoring and adjustments based on the carbon isotope ratio of the biomass in the current cycle can effectively improve the accuracy of carbon emission monitoring, thereby improving the power generation efficiency of fuel power plants. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1This is a flowchart illustrating an embodiment of the carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics provided by the present invention. Figure 2 This is a schematic diagram of one embodiment of the carbon emission adjustment device based on carbon dioxide isotope fingerprint characteristics provided by the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0025] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0026] Example 1 See Figure 1 To address the issue of low accuracy in carbon emission monitoring in existing technologies, an embodiment of the present invention provides a carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics. This method includes steps 101 to 105, each step of which is detailed below: Step 101: During the fuel combustion process, the total carbon isotope ratio and total carbon emissions in the emitted flue gas are collected in real time; wherein the fuel includes biomass and fossil fuels.

[0027] In this embodiment of the invention, the fuel for the fuel power plant includes biomass and fossil fuels. Biomass is a renewable organic carbon-based material derived from living organisms that can be directly burned or used to produce fuel after simple processing. Fossil fuels are non-renewable mineral fuels formed from biomass such as microorganisms through geological processes such as crustal movement, high temperature and pressure, and physical and chemical changes. The carbon dioxide produced by biomass combustion is considered carbon neutral. When calculating the carbon emission intensity of the fuel power plant, only the electrical carbon factor contributed by fossil fuels is considered. Therefore, the carbon emissions from biomass need to be deducted from the total carbon emissions of the fuel power plant.

[0028] In embodiments of the present invention, biomass and fossil fuels 13 C content and 12 The different carbon content results in different carbon isotope ratios between biomass and fossil fuels, leading to different combustion characteristics. In the fuel combustion process of a fuel-fired power plant, the blending ratio between biomass and fossil fuels is initially set. However, this blending ratio changes in each cycle during combustion. Therefore, when calculating carbon emission intensity in each cycle, the actual ratio between biomass and fossil fuels can be determined by analyzing the fuel combustion characteristics in real time, resulting in a more accurate calculation of carbon emission intensity.

[0029] In this embodiment of the invention, a continuous online carbon emission monitor is installed in the chimney or flue of a fuel power plant, enabling real-time measurement of the total carbon emissions in the flue gas emitted during combustion. A cavity ring-down spectroscopy measurement module is installed in the chimney or flue of the fuel power plant, enabling real-time measurement of the total carbon isotope ratio in the flue gas emitted during combustion. The total carbon isotope ratio is the total carbon emissions during combustion. 13 C content and total 12 The ratio between C contents.

[0030] In this embodiment of the invention, the total [value] is measured using an optical cavity ring-down spectroscopy measurement module. 13 C content and total 12 The method for determining carbon content is based on the spectral characteristics of carbon dioxide isotopes. Specifically, the absorption spectrum of a molecule is determined by its vibrational, i.e., rotational energy level transitions, and the energy level is directly related to the reduced mass of the molecule. Because... 13 C and 12 The different nuclei of carbon atoms result in a difference in the reduced mass of ¹²CO₂ and ¹³CO₂ molecules. This minute change in reduced mass leads to a difference in the vibrational-rotational energy level spacing between the two molecules, resulting in different wavelengths (wavenumbers) of their characteristic absorption lines—a phenomenon known as isotopic shift. Based on this isotopic shift effect, the characteristic absorption peaks of ¹²CO₂ and ¹³CO₂ appear in the mid-infrared band (~4.3 μm, ~2.0 μm), with a wavelength difference of approximately tens to hundreds of wavenumbers. Furthermore, their peak shapes do not overlap and can be precisely matched individually using narrow-linewidth lasers. At the same wavelength, the absorption coefficient α of a particular CO₂ isotope is proportional to its molecular concentration. Therefore, by analyzing the absorption coefficients of two CO₂ isotopes, the total carbon isotope ratio for the current period can be measured.

[0031] Step 102: When it is determined that the types of biomass in the fuel of the current cycle have changed based on the carbon isotope ratio of biomass in the previous cycle, the fuel blending ratio of the current cycle, and the total carbon isotope ratio, calculate the similarity between the carbon isotope ratio of biomass in the previous cycle and the standard value of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database, and select the biomass corresponding to the standard value of the carbon isotope ratio of biomass with a similarity greater than the preset similarity as candidate biomass.

[0032] As a preferred embodiment, determining the change in biomass type in the fuel during the current cycle based on the carbon isotope ratio of biomass from the previous cycle, the fuel blending ratio of the current cycle, and the total carbon isotope ratio includes: Based on the carbon isotope ratio of biomass in the previous cycle, the fuel blending ratio in the current cycle, and the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, calculate the standard value of the total carbon isotope ratio in the current cycle. Calculate the deviation between the total carbon isotope ratio and the standard value of the total carbon isotope ratio for the current period; When the deviation value is greater than the preset deviation, it is determined that the type of biomass in the fuel of the current cycle has changed.

[0033] In this embodiment of the invention, during the carbon emission monitoring of the previous cycle, the carbon isotope ratio of biomass in the previous cycle can be measured. Combining this previous cycle's carbon isotope ratio, the set fuel blending ratio for the current cycle, and the real-time collected total carbon isotope ratio, it can be determined whether the biomass type in the fuel has changed in the current cycle. Specifically, since the collected total carbon isotope ratio includes carbon emission data from both biomass and fossil fuels, after obtaining the previous cycle's biomass carbon isotope ratio, it is necessary to obtain the standard value of the fossil fuel carbon isotope ratio from a preset carbon dioxide isotope fingerprint database. Combined with the current cycle's fuel blending ratio, a weighted analysis is used to calculate the standard value of the current cycle's total carbon isotope ratio. Comparing the real-time collected total carbon isotope ratio with the standard value of the current cycle yields a deviation value. This deviation value is then compared with a preset deviation. If the deviation value is greater than the preset deviation, it indicates that the combustion characteristics of the current biomass differ significantly from those of the previous cycle, suggesting a change in the biomass type in the fuel in the current cycle.

[0034] As a preferred embodiment, the total carbon isotope ratio standard value for the current period is calculated based on the carbon isotope ratio of biomass in the previous period, the fuel blending ratio in the current period, and the standard value of fossil fuel carbon isotope ratio in a preset carbon dioxide isotope fingerprint database, including: The current biomass ratio and the current fossil fuel ratio are calculated based on the fuel blending ratio of the current cycle; Based on the carbon isotope ratio of biomass in the previous period, the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, the current biomass proportion, and the current fossil fuel proportion, solve the following equation to obtain the standard value of the total carbon isotope ratio for the current period: In the formula, This is the standard value for the total carbon isotope ratio in the current period; The carbon isotope ratio of biomass from the previous period; This represents the current percentage of biomass. To pre-determine the standard values ​​for the proportion of fossil fuel carbon isotopes in the carbon dioxide isotope fingerprint database; This represents the current percentage of fossil fuels used.

[0035] In this embodiment of the invention, based on the set fuel blending ratio for the current cycle, the current biomass percentage and the current fossil fuel percentage can be calculated by solving the following set of equations: In the formula, The fuel blending ratio for the current cycle; This represents the current percentage of biomass. This represents the current percentage of fossil fuels used.

[0036] Using the calculated current biomass and fossil fuel proportions as weighting coefficients, the carbon isotope proportion of biomass in the previous period and the standard value of the carbon isotope proportion of fossil fuels in the preset carbon dioxide isotope fingerprint database are weighted and summed to calculate the standard value of the total carbon isotope proportion in the current period.

[0037] In this embodiment of the invention, when it is determined that the type of biomass in the fuel changes in the current cycle, the carbon isotope ratio of the biomass from the previous cycle cannot be used for carbon emission monitoring in the current cycle. Therefore, it is necessary to recalculate the carbon isotope ratio of the biomass in the current cycle. The types of biomass include corn stalks, municipal sludge, and pine wood, etc., and each type of biomass corresponds to a standard value for its carbon isotope ratio. When calculating the carbon isotope ratio of the biomass in the current cycle, it is necessary to compare the similarity between the carbon isotope ratio of the biomass from the previous cycle and the standard values ​​of the carbon isotope ratios of each biomass in a preset carbon dioxide isotope fingerprint database. This allows for the selection of biomass corresponding to standard values ​​of carbon isotope ratios with similarity greater than the preset similarity as candidate biomass. The carbon isotope ratio of the biomass in the current cycle is then calculated based on the standard values ​​of the carbon isotope ratios of each candidate biomass.

[0038] As a preferred embodiment, the similarity between the carbon isotope ratio of the previous period's biomass and the standard values ​​of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database is calculated, including: For each standard value of carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, calculate the difference between the carbon isotope ratio of biomass in the previous period and the standard value of carbon isotope ratio of biomass. Calculate the ratio of the difference in the ratio to the carbon isotope ratio of the biomass in the previous period to obtain the relative deviation between the carbon isotope ratio of the biomass in the previous period and the standard value of the carbon isotope ratio of the biomass. Based on the relative deviation value, the similarity between the carbon isotope ratio of the previous period's biomass and the standard value of the carbon isotope ratio of biomass in the preset carbon dioxide isotope fingerprint database is determined.

[0039] In this embodiment of the invention, candidate biomass can be screened by calculating the similarity between the carbon isotope ratio of the previous period's biomass and the standard values ​​of the carbon isotope ratio of each biomass in a preset carbon dioxide isotope fingerprint database. Specifically, firstly, the difference between the carbon isotope ratio of the previous period's biomass and the standard values ​​of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database is calculated. The ratio of the calculated difference to the carbon isotope ratio of the previous period's biomass is determined as the relative deviation value, and the similarity is calculated based on this relative deviation value.

[0040] In this embodiment of the invention, the similarity between the carbon isotope ratio of biomass in the previous period and the standard values ​​of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database can be calculated according to the following formula: In the formula, The similarity between the standard value j of the carbon isotope ratio of biomass and the carbon isotope ratio of biomass in the previous period. The carbon isotope ratio of biomass from the previous period; The standard value j of the proportion of biomass carbon isotopes in the preset carbon dioxide isotope fingerprint database is used.

[0041] In this embodiment of the invention, the standard value of the proportion of carbon isotopes in biomass in the preset carbon dioxide isotope fingerprint library can be obtained by experimental measurement. Specifically, since biomass (straw, wood, crops, mushroom residue, organic waste, etc.) is a solid organic carbon matrix, carbon isotopes cannot be directly detected. Therefore, it is necessary to quantitatively convert the carbon in biomass into high-purity CO2 gas, and then determine the isotopic abundance of ¹²CO2 and ¹³CO2 in the CO2 gas. Finally, the ratio of ¹³CO2 content to ¹²CO2 content is determined as the standard value of the proportion of carbon isotopes in biomass.

[0042] Since biomass is a solid organic sample containing interfering components such as moisture, ash, and inorganic carbon (carbonates), and the carbon exists in an organically bonded form, the following steps are required to quantitatively convert the carbon in biomass into high-purity CO2 gas that can be used for isotope detection: The biomass sample is first pretreated, which includes a purification and homogenization process. This purification and homogenization involves drying and grinding, as well as inorganic carbon removal. Specifically, drying and grinding involves drying the biomass sample to a constant weight (60-80℃), grinding it through an 80-100 mesh sieve to obtain a uniform powder, thus eliminating errors caused by sample particle size and moisture content. Inorganic carbon removal involves soaking the sample in dilute hydrochloric acid (1-2 mol / L) if the biomass contains carbonates (such as straw or soil biomass complexes) to remove inorganic carbon through a chemical reaction, leaving only organic carbon after drying. After completing the above biomass sample pretreatment, an appropriate amount (e.g., 0.1-2 mg) of pure biomass powder is accurately weighed and sealed in a tin or silver boat.

[0043] Quantitative carbon conversion of pretreated biomass samples can be performed using a high-temperature combustion method. This involves placing a sealed sample boat into a high-temperature combustion furnace (950~1100℃), where the biomass undergoes complete combustion in a high-purity oxygen atmosphere and under the action of an oxidant (such as Cr2O3 / CuO). The resulting gas mixture is then treated to remove water (molecular sieves) and impurities (alkali asbestos to remove SO2). x / NO x The process involves purification by reducing impurities with metallic copper, ultimately yielding high-purity CO2 gas free of any impurities. The carbon conversion rate is 100%, and there is no ¹²C / ¹³C isotope fractionation, ensuring that the isotope ratio is consistent with the original sample.

[0044] After obtaining high-purity CO2, the abundance ratio of ¹²CO2 and ¹³CO2 was detected using the EA-IRMS method, thereby calculating the ¹²C / ¹³C isotope ratio. Specifically, after pretreatment and conversion of biomass to pure CO2 using an elemental analyzer (EA), the converted CO2 gas was directly introduced into an isotope ratio mass spectrometer (IRMS) via a pipeline. The isotope mass spectrometer separates and quantifies the isotope ions of CO2 by utilizing the difference in deflection of ions with different mass numbers in a magnetic field. Specifically, CO2 molecules are ionized into CO2+ in the ion source, with ¹²CO2 corresponding to a molecular ion mass number of 44 and ¹³CO2 corresponding to a mass number of 45. The isotope mass spectrometer accurately measures the ratio of ion current intensity at m / z=44 and m / z=45. R = I 45 / I 44 The ratio of ion current intensity directly corresponds to the ¹²C / ¹³C isotope ratio of the biomass sample, that is, the standard value of the biomass carbon isotope ratio.

[0045] Step 103: When only one candidate biomass exists, the carbon isotope ratio standard value of the candidate biomass is determined as the carbon isotope ratio of the biomass in the current period.

[0046] In this embodiment of the invention, after screening candidate biomass based on the similarity between the carbon isotope ratio of the previous period's biomass and the standard values ​​of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database, if only one candidate biomass exists, then the organism in the current period is considered to be that candidate biomass, and the standard value of the carbon isotope ratio of that candidate biomass is determined as the carbon isotope ratio of the current period's biomass for subsequent carbon emission analysis.

[0047] Step 104: When there are multiple candidate biomass, calculate the carbon isotope ratio of the current period biomass based on the standard value of the carbon isotope ratio of each candidate biomass and the corresponding weighting coefficient.

[0048] In this embodiment of the invention, if there are multiple candidate biomass, the carbon isotope ratio of the current period biomass is calculated by weighted summation based on the standard value of the carbon isotope ratio of each candidate biomass and the corresponding weight coefficient.

[0049] As a preferred embodiment, when multiple candidate biomass exist, the carbon isotope ratio of the current period's biomass is calculated based on the standard value of the carbon isotope ratio of each candidate biomass and its corresponding weighting coefficient, including: When multiple candidate biomass exist, the weighting coefficient of each candidate biomass is calculated based on the real-time combustion temperature, real-time ambient temperature, and the similarity between the standard value of the carbon isotope ratio of each candidate biomass and the carbon isotope ratio of the biomass in the previous period. Based on the weighting coefficients of each candidate biomass, the standard values ​​of the carbon isotope ratios of each candidate biomass are weighted and summed to obtain the carbon isotope ratios of the biomass in the current period.

[0050] In this embodiment of the invention, the weighting coefficient of each candidate biomass is first calculated, and then the carbon isotope ratio standard values ​​of each candidate biomass are weighted and summed according to the weighting coefficient of each candidate biomass to calculate the carbon isotope ratio of the biomass in the current period. The weighting coefficient of each candidate biomass is calculated in conjunction with the real-time combustion temperature, the real-time ambient temperature, and the similarity between the carbon isotope ratio standard values ​​of the candidate biomass and the carbon isotope ratio of the biomass in the previous period.

[0051] As a preferred embodiment, the weighting coefficient of each candidate biomass is calculated based on the real-time combustion temperature, real-time ambient temperature, and the similarity between the standard value of the carbon isotope ratio of each candidate biomass and the carbon isotope ratio of the biomass in the previous period, including: For each candidate biomass, obtain the suitable temperature range and suitable humidity range corresponding to the candidate biomass; The temperature overlap is calculated based on the real-time combustion temperature and the aforementioned suitable temperature range; The humidity overlap is calculated based on the real-time ambient humidity and the specified adaptive humidity range; The working condition fit of the candidate biomass carbon ratio is obtained by weighted summation of the temperature overlap and the humidity overlap. The weighting coefficients for each candidate biomass are calculated based on the working condition suitability of each candidate biomass and the similarity between the standard value of the carbon isotope ratio of the candidate biomass and the carbon isotope ratio of the biomass in the previous period.

[0052] In this embodiment of the invention, each candidate biomass corresponds to a suitable temperature range and a suitable humidity range. When calculating the weight coefficient of the candidate biomass, the temperature overlap is first calculated based on the real-time combustion temperature and the suitable temperature range, and the humidity overlap is calculated based on the real-time ambient humidity and the suitable humidity range. The temperature overlap and humidity overlap are then weighted and summed to obtain the operating condition fit of the carbon ratio of the candidate biomass. Then, considering the operating condition fit and the similarity between the current candidate biomass carbon isotope ratio standard value and the carbon isotope ratio of the previous period biomass, the weight coefficient of the current candidate biomass is calculated.

[0053] In this embodiment of the invention, the temperature overlap can be calculated according to the following formula: In the formula, Temperature overlap; This refers to the real-time combustion temperature. To accommodate the maximum temperature within the appropriate temperature range; To adapt to the minimum temperature within the temperature range; This is the value between the maximum and minimum temperatures that differs least from the real-time combustion temperature. For example, assuming the minimum temperature of the candidate biomass is 840 degrees Celsius, the maximum temperature is 950 degrees Celsius, and the real-time combustion temperature is 900 degrees Celsius, then the real-time combustion temperature differs from the minimum temperature by 60 degrees Celsius and from the maximum temperature by 50 degrees Celsius. .

[0054] Humidity overlap can be calculated using the following formula: In the formula, Humidity overlap; Real-time ambient humidity; To match the maximum humidity value within the appropriate humidity range; The minimum humidity value within the appropriate humidity range; This is the value that differs from the real-time ambient humidity between the maximum and minimum humidity values. For example, assuming the minimum humidity of the candidate biomass is 15%, the maximum humidity is 8%, and the real-time ambient humidity is 12%, then the difference between the real-time ambient humidity and the minimum humidity is 4%, and the difference between the real-time combustion temperature and the maximum humidity is 3%. .

[0055] In the real-time example of this invention, after calculating the temperature and humidity overlap of each candidate biomass, a weighted sum is performed based on pre-set temperature and humidity weights to calculate the weight coefficient of each candidate biomass. Since temperature directly affects combustion oxidation efficiency, and thus the degree of isotope fractionation, the influence of combustion temperature on biomass isotope characteristics can be set to have a higher weight than that of ambient humidity. For example, a temperature weight can be set. Humidity weight The formula for calculating the weighting coefficient of candidate biomass is: In the formula, These are the weighting coefficients for candidate biomass. Temperature overlap of candidate biomass; Temperature weighting; The wet overlap of candidate biomass; Humidity weighting.

[0056] As a preferred embodiment, the weighting coefficients of each candidate biomass are calculated using the following formulas: In the formula, , where is the weighting coefficient for candidate biomass i; The operating condition fit of candidate biomass i; The similarity between the carbon isotope ratios of candidate biomass i and the biomass from the previous period; The number of all candidate biomass.

[0057] Step 105: Calculate the fossil fuel carbon emissions based on the carbon isotope ratio of biomass in the current cycle, the standard value of fossil fuel carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio. Adjust the fuel blending ratio of the fuel power plant for the next cycle based on the fossil fuel carbon emissions.

[0058] In this embodiment of the invention, based on the calculated carbon isotope ratio of biomass in the current cycle, combined with the standard value of fossil fuel carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, and the collected total carbon emissions and total carbon isotope ratio, the carbon emissions of fossil fuels can be calculated to reflect the carbon emission intensity of the fuel power plant in the current cycle. Based on the carbon emissions of fossil fuels in the current cycle, the fuel blending ratio of the fuel power plant in the next cycle can be adjusted to improve the power generation efficiency of the fuel power plant.

[0059] As a preferred embodiment, the fossil fuel carbon emissions are calculated based on the carbon isotope ratio of the current periodic biomass, the standard value of the fossil fuel carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio, including: Calculate the current cycle biomass based on the carbon isotope ratio of the current cycle biomass. 13 C content and current cycle biomass 12 C content; Fossil fuels are calculated based on the standard values ​​of fossil fuel carbon isotope ratios in a pre-set carbon dioxide isotope fingerprint database. 13 C content and fossil fuels 12 C content; Based on the current cycle of biomass 13 C content, current cycle biomass 12 C content, fossil fuels 13 C content, fossil fuels 12 Using the C content, the total carbon emissions, and the total carbon isotope ratio, solve the following equations to obtain the biomass carbon emissions and fossil fuel carbon emissions: In the formula, For biomass carbon emissions; Carbon emissions from fossil fuels; Total carbon emissions; The percentage of total carbon isotopes; For the current cycle of biomass 13 C content; For the current cycle of biomass 12 C content; fossil fuels 13 C content; fossil fuels 12 C content.

[0060] In this embodiment of the invention, the carbon isotope ratio of the current periodic biomass can be calculated by solving the following formula. 13 C content and current cycle biomass12 C content: In the formula, For the current cycle of biomass 13 C content; For the current cycle of biomass 12 C content; This represents the carbon isotope ratio of biomass in the current cycle.

[0061] Using the same method, fossil fuel carbon isotope ratio standard values ​​in a pre-defined carbon dioxide isotope fingerprint database are used to calculate fossil fuel... 13 C content and fossil fuels 12 C content .

[0062] Calculations show that the current cycle of biomass... 13 C content Current cycle of biomass 12 C content fossil fuels 13 C content fossil fuels 12 C content and the total carbon emissions collected. and total carbon isotope ratio By solving the above equations, we can obtain the biomass carbon emissions. and carbon emissions from fossil fuels .

[0063] As a preferred embodiment, adjusting the fuel blending ratio of the fuel power plant for the next cycle based on fossil fuel carbon emissions includes: Collect the power generation of fuel power plants for the current period; The ratio of fossil fuel carbon emissions to the electricity generated by the fuel power plant is defined as the fossil fuel carbon emission factor. Calculate the difference in carbon factor between the stated fossil fuel and the preset standard for carbon factor of fossil fuel; When the difference in the electric carbon factor is greater than a preset difference threshold, the fuel blending ratio for the next cycle is adjusted.

[0064] In this embodiment of the invention, while collecting the proportion of total carbon isotopes and the total carbon emissions in the flue gas emitted during fuel combustion, the power generation of the fuel power plant in the current period is collected simultaneously. After calculating the fossil fuel carbon emissions, the ratio of the fossil fuel carbon emissions to the power generation of the fuel power plant in the current period is determined as the fossil fuel carbon factor characterizing the carbon emission intensity of the fuel power plant.

[0065] In this embodiment of the invention, a fossil fuel carbon factor standard is pre-set for the fuel power plant. This standard is used to balance fuel costs and power generation efficiency. Therefore, after calculating the fossil fuel carbon factor for the current period, the fuel blending ratio for the next period can be guided by the fossil fuel carbon factor standard. First, the difference between the fossil fuel carbon factor and the preset fossil fuel carbon factor standard is calculated. When the difference is greater than a preset threshold, it is considered that the fuel blending ratio for the next period needs to be adjusted. Specifically, if the fossil fuel carbon factor for the current period is greater than the preset fossil fuel carbon factor, it is considered that the proportion of fossil fuel in the current period is relatively large, and the proportion of fossil fuel in the fuel blending ratio for the next period can be reduced. Conversely, if the fossil fuel carbon factor for the current period is less than the preset fossil fuel carbon factor, it is considered that the proportion of fossil fuel in the current period is relatively small, and the proportion of fossil fuel in the fuel blending ratio for the next period can be increased.

[0066] Implementing the above embodiments has the following effects: This invention provides a carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics. It collects the total carbon isotope ratio and total carbon emissions for the current cycle in real time. Based on the carbon isotope ratio of biomass from the previous cycle, the fuel blending ratio for the current cycle, and the total carbon isotope ratio for the current cycle, it determines whether the biomass type in the fuel has changed. If a change is confirmed, candidate biomass is selected based on the standard values ​​of the carbon isotope ratio of each biomass in a preset carbon dioxide isotope fingerprint database. When only one candidate biomass exists, its carbon isotope ratio standard value is determined as the carbon isotope ratio of the biomass for the current cycle. When multiple candidate biomass exists, the carbon isotope ratio of the biomass for the current cycle is calculated based on the standard values ​​of the carbon isotope ratio of each candidate biomass and their corresponding weighting coefficients. Therefore, the carbon emissions of fossil fuels for the current cycle are calculated based on the carbon isotope ratio of the biomass for the current cycle, allowing for the adjustment of the fuel blending ratio of fuel-fired power plants according to the fossil fuel carbon emissions. This invention determines whether the biomass species in the fuel have changed in the current cycle by comparing the total carbon isotope ratio collected in the current cycle with the carbon isotope ratio of biomass in the previous cycle. When it is determined that the biomass species in the fuel have changed in the current cycle, the carbon isotope ratio of the biomass in the current cycle is calculated based on a preset carbon dioxide isotope fingerprint database. The carbon isotope ratio of the biomass in the current cycle reflects the combustion characteristics of the biomass in the current cycle. Subsequent carbon emission monitoring and adjustments based on the carbon isotope ratio of the biomass in the current cycle can effectively improve the accuracy of carbon emission monitoring, thereby improving the power generation efficiency of fuel power plants.

[0067] Example 2 See Figure 2This is a schematic diagram of an embodiment of the carbon emission adjustment device based on carbon dioxide isotope fingerprint features provided by the present invention. The device includes an isotope detection module, a similarity calculation module, a first ratio correction module, a second ratio correction module, and a carbon emission adjustment module. The isotope detection module is used to collect the total carbon isotope ratio and total carbon emissions in the emitted flue gas in real time during fuel combustion; wherein the fuel includes biomass and fossil fuels; The similarity calculation module is used to calculate the similarity between the carbon isotope ratio of biomass in the previous period and the standard value of carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database when the type of biomass in the fuel changes in the current period based on the carbon isotope ratio of biomass in the previous period, the fuel blending ratio in the current period, and the total carbon isotope ratio. Biomass corresponding to the standard value of carbon isotope ratio of biomass with a similarity greater than the preset similarity is selected as candidate biomass. The first ratio correction module is used to determine the carbon isotope ratio standard value of the candidate biomass as the carbon isotope ratio of the biomass in the current period when there is only one candidate biomass. The second ratio correction module is used to calculate the carbon isotope ratio of the current period biomass based on the standard value of the carbon isotope ratio of each candidate biomass and the corresponding weighting coefficient when there are multiple candidate biomass. The carbon emission adjustment module is used to calculate the fossil fuel carbon emissions based on the carbon isotope ratio of biomass in the current cycle, the standard value of fossil fuel carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio, and to adjust the fuel blending ratio of the fuel power plant in the next cycle based on the fossil fuel carbon emissions.

[0068] As a preferred embodiment, determining the change in biomass type in the fuel during the current cycle based on the carbon isotope ratio of biomass from the previous cycle, the fuel blending ratio of the current cycle, and the total carbon isotope ratio includes: Based on the carbon isotope ratio of biomass in the previous cycle, the fuel blending ratio in the current cycle, and the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, calculate the standard value of the total carbon isotope ratio in the current cycle. Calculate the deviation between the total carbon isotope ratio and the standard value of the total carbon isotope ratio for the current period; When the deviation value is greater than the preset deviation, it is determined that the type of biomass in the fuel of the current cycle has changed.

[0069] As a preferred embodiment, the total carbon isotope ratio standard value for the current period is calculated based on the carbon isotope ratio of biomass in the previous period, the fuel blending ratio in the current period, and the standard value of fossil fuel carbon isotope ratio in a preset carbon dioxide isotope fingerprint database, including: The current biomass ratio and the current fossil fuel ratio are calculated based on the fuel blending ratio of the current cycle; Based on the carbon isotope ratio of biomass in the previous period, the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, the current biomass proportion, and the current fossil fuel proportion, solve the following equation to obtain the standard value of the total carbon isotope ratio for the current period: In the formula, This is the standard value for the total carbon isotope ratio in the current period; The carbon isotope ratio of biomass from the previous period; This represents the current percentage of biomass. To pre-determine the standard values ​​for the proportion of fossil fuel carbon isotopes in the carbon dioxide isotope fingerprint database; This represents the current percentage of fossil fuels used.

[0070] As a preferred embodiment, the similarity between the carbon isotope ratio of the previous period's biomass and the standard values ​​of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database is calculated, including: For each standard value of carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, calculate the difference between the carbon isotope ratio of biomass in the previous period and the standard value of carbon isotope ratio of biomass. Calculate the ratio of the difference in the ratio to the carbon isotope ratio of the biomass in the previous period to obtain the relative deviation between the carbon isotope ratio of the biomass in the previous period and the standard value of the carbon isotope ratio of the biomass. Based on the relative deviation value, the similarity between the carbon isotope ratio of the previous period's biomass and the standard value of the carbon isotope ratio of biomass in the preset carbon dioxide isotope fingerprint database is determined.

[0071] As a preferred embodiment, when multiple candidate biomass exist, the carbon isotope ratio of the current period's biomass is calculated based on the standard value of the carbon isotope ratio of each candidate biomass and its corresponding weighting coefficient, including: When multiple candidate biomass exist, the weighting coefficient of each candidate biomass is calculated based on the real-time combustion temperature, real-time ambient temperature, and the similarity between the standard value of the carbon isotope ratio of each candidate biomass and the carbon isotope ratio of the biomass in the previous period. Based on the weighting coefficients of each candidate biomass, the standard values ​​of the carbon isotope ratios of each candidate biomass are weighted and summed to obtain the carbon isotope ratios of the biomass in the current period.

[0072] As a preferred embodiment, the weighting coefficient of each candidate biomass is calculated based on the real-time combustion temperature, real-time ambient temperature, and the similarity between the standard value of the carbon isotope ratio of each candidate biomass and the carbon isotope ratio of the biomass in the previous period, including: For each candidate biomass, obtain the suitable temperature range and suitable humidity range corresponding to the candidate biomass; The temperature overlap is calculated based on the real-time combustion temperature and the aforementioned suitable temperature range; The humidity overlap is calculated based on the real-time ambient humidity and the specified adaptive humidity range; The working condition fit of the candidate biomass carbon ratio is obtained by weighted summation of the temperature overlap and the humidity overlap. The weighting coefficients for each candidate biomass are calculated based on the working condition suitability of each candidate biomass and the similarity between the standard value of the carbon isotope ratio of the candidate biomass and the carbon isotope ratio of the biomass in the previous period.

[0073] As a preferred embodiment, the weighting coefficients of each candidate biomass are calculated using the following formulas: In the formula, , where is the weighting coefficient for candidate biomass i; The operating condition fit of candidate biomass i; The similarity between the carbon isotope ratios of candidate biomass i and the biomass from the previous period; The number of all candidate biomass.

[0074] As a preferred embodiment, the fossil fuel carbon emissions are calculated based on the carbon isotope ratio of the current periodic biomass, the standard value of the fossil fuel carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio, including: Calculate the current cycle biomass based on the carbon isotope ratio of the current cycle biomass. 13 C content and current cycle biomass 12 C content; Fossil fuels are calculated based on the standard values ​​of fossil fuel carbon isotope ratios in a pre-set carbon dioxide isotope fingerprint database. 13 C content and fossil fuels 12 C content; Based on the current cycle of biomass 13 C content, current cycle biomass 12 C content, fossil fuels13 C content, fossil fuels 12 Using the C content, the total carbon emissions, and the total carbon isotope ratio, solve the following equations to obtain the biomass carbon emissions and fossil fuel carbon emissions: In the formula, For biomass carbon emissions; Carbon emissions from fossil fuels; Total carbon emissions; The percentage of total carbon isotopes; For the current cycle of biomass 13 C content; For the current cycle of biomass 12 C content; fossil fuels 13 C content; fossil fuels 12 C content.

[0075] As a preferred embodiment, adjusting the fuel blending ratio of the fuel power plant for the next cycle based on fossil fuel carbon emissions includes: Collect the power generation of fuel power plants for the current period; The ratio of fossil fuel carbon emissions to the electricity generated by the fuel power plant is defined as the fossil fuel carbon emission factor. Calculate the difference in carbon factor between the stated fossil fuel and the preset standard for carbon factor of fossil fuel; When the difference in the electric carbon factor is greater than a preset difference threshold, the fuel blending ratio for the next cycle is adjusted.

[0076] Implementing the above embodiments has the following effects: This invention provides a carbon emission adjustment device based on carbon dioxide isotope fingerprint characteristics. It collects the total carbon isotope ratio and total carbon emissions for the current cycle in real time. Based on the carbon isotope ratio of biomass from the previous cycle, the fuel blending ratio for the current cycle, and the total carbon isotope ratio for the current cycle, it determines whether the biomass type in the fuel has changed. If a change is confirmed, candidate biomass is selected based on the standard values ​​of the carbon isotope ratio of each biomass in a preset carbon dioxide isotope fingerprint database. When only one candidate biomass exists, its carbon isotope ratio standard value is determined as the carbon isotope ratio of the biomass for the current cycle. When multiple candidate biomass exists, the carbon isotope ratio of the biomass for the current cycle is calculated based on the standard values ​​of the carbon isotope ratio of each candidate biomass and their corresponding weighting coefficients. Therefore, the carbon emissions of fossil fuels for the current cycle are calculated based on the carbon isotope ratio of the biomass for the current cycle, allowing for adjustment of the fuel blending ratio of fuel-fired power plants according to the fossil fuel carbon emissions. This invention determines whether the biomass species in the fuel have changed in the current cycle by comparing the total carbon isotope ratio collected in the current cycle with the carbon isotope ratio of biomass in the previous cycle. When it is determined that the biomass species in the fuel have changed in the current cycle, the carbon isotope ratio of the biomass in the current cycle is calculated based on a preset carbon dioxide isotope fingerprint database. The carbon isotope ratio of the biomass in the current cycle reflects the combustion characteristics of the biomass in the current cycle. Subsequent carbon emission monitoring and adjustments based on the carbon isotope ratio of the biomass in the current cycle can effectively improve the accuracy of carbon emission monitoring, thereby improving the power generation efficiency of fuel power plants.

[0077] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0078] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics, characterized in that, include: During fuel combustion, the total carbon isotope ratio and total carbon emissions in the emitted flue gas are collected in real time; wherein the fuel includes biomass and fossil fuels; When it is determined that the types of biomass in the fuel change in the current cycle based on the carbon isotope ratio of biomass in the previous cycle, the fuel blending ratio in the current cycle, and the total carbon isotope ratio, the similarity between the carbon isotope ratio of biomass in the previous cycle and the standard value of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database is calculated, and the biomass corresponding to the standard value of the carbon isotope ratio of biomass with a similarity greater than the preset similarity is selected as candidate biomass. When only one candidate biomass exists, the carbon isotope ratio standard value of the candidate biomass is determined as the carbon isotope ratio of the biomass in the current period. When multiple candidate biomass exist, the carbon isotope ratio of the current period biomass is calculated based on the standard value of the carbon isotope ratio of each candidate biomass and the corresponding weighting coefficient. Based on the carbon isotope ratio of biomass in the current cycle, the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio, the carbon emissions of fossil fuels are calculated, and the fuel blending ratio of the fuel power plant in the next cycle is adjusted according to the carbon emissions of fossil fuels.

2. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 1, characterized in that, The changes in biomass composition in the fuel during the current cycle are determined based on the carbon isotope ratio of biomass from the previous cycle, the fuel blending ratio for the current cycle, and the total carbon isotope ratio. These changes include: Based on the carbon isotope ratio of biomass in the previous cycle, the fuel blending ratio in the current cycle, and the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, calculate the standard value of the total carbon isotope ratio in the current cycle. Calculate the deviation between the total carbon isotope ratio and the standard value of the total carbon isotope ratio for the current period; When the deviation value is greater than the preset deviation, it is determined that the type of biomass in the fuel of the current cycle has changed.

3. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 2, characterized in that, The calculation of the total carbon isotope ratio standard value for the current period, based on the carbon isotope ratio of biomass from the previous period, the fuel blending ratio for the current period, and the standard values ​​of fossil fuel carbon isotope ratios in a preset carbon dioxide isotope fingerprint database, includes: The current biomass ratio and the current fossil fuel ratio are calculated based on the fuel blending ratio of the current cycle; Based on the carbon isotope ratio of biomass in the previous period, the standard value of the carbon isotope ratio of fossil fuels in the preset carbon dioxide isotope fingerprint database, the current biomass proportion, and the current fossil fuel proportion, solve the following equation to obtain the standard value of the total carbon isotope ratio for the current period: In the formula, This is the standard value for the total carbon isotope ratio in the current period; The carbon isotope ratio of biomass from the previous period; This represents the current percentage of biomass. To pre-determine the standard values ​​for the proportion of fossil fuel carbon isotopes in the carbon dioxide isotope fingerprint database; This represents the current percentage of fossil fuels used.

4. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 1, characterized in that, The calculation of the similarity between the carbon isotope ratio of biomass in the previous period and the standard values ​​of the carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database includes: For each standard value of carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, calculate the difference between the carbon isotope ratio of biomass in the previous period and the standard value of carbon isotope ratio of biomass. Calculate the ratio of the difference in the ratio to the carbon isotope ratio of the biomass in the previous period to obtain the relative deviation between the carbon isotope ratio of the biomass in the previous period and the standard value of the carbon isotope ratio of the biomass. Based on the relative deviation value, the similarity between the carbon isotope ratio of the previous period's biomass and the standard value of the carbon isotope ratio of biomass in the preset carbon dioxide isotope fingerprint database is determined.

5. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 1, characterized in that, When multiple candidate biomass exist, the calculation of the carbon isotope ratio of the current period's biomass based on the standard value of the carbon isotope ratio of each candidate biomass and its corresponding weighting coefficient includes: When multiple candidate biomass exist, the weighting coefficient of each candidate biomass is calculated based on the real-time combustion temperature, real-time ambient temperature, and the similarity between the standard value of the carbon isotope ratio of each candidate biomass and the carbon isotope ratio of the biomass in the previous period. Based on the weighting coefficients of each candidate biomass, the standard values ​​of the carbon isotope ratios of each candidate biomass are weighted and summed to obtain the carbon isotope ratios of the biomass in the current period.

6. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 5, characterized in that, The weighting coefficients for each candidate biomass are calculated based on real-time combustion temperature, real-time ambient temperature, and the similarity between the standard values ​​of the carbon isotope ratios of each candidate biomass and the carbon isotope ratios of biomass from the previous period. This includes: For each candidate biomass, obtain the suitable temperature range and suitable humidity range corresponding to the candidate biomass; The temperature overlap is calculated based on the real-time combustion temperature and the aforementioned suitable temperature range; The humidity overlap is calculated based on the real-time ambient humidity and the specified adaptive humidity range; The working condition fit of the candidate biomass carbon ratio is obtained by weighted summation of the temperature overlap and the humidity overlap. The weighting coefficients for each candidate biomass are calculated based on the working condition suitability of each candidate biomass and the similarity between the standard value of the carbon isotope ratio of the candidate biomass and the carbon isotope ratio of the biomass in the previous period.

7. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 6, characterized in that, The weighting coefficients for each candidate biomass are calculated using the following formulas: In the formula, , where is the weighting coefficient for candidate biomass i; The operating condition fit of candidate biomass i; The similarity between the carbon isotope ratios of candidate biomass i and the biomass from the previous period; The number of all candidate biomass.

8. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 1, characterized in that, The calculation of fossil fuel carbon emissions based on the carbon isotope ratio of biomass in the current cycle, the standard value of fossil fuel carbon isotope ratio in a preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio includes: Calculate the current cycle biomass based on the carbon isotope ratio of the current cycle biomass. 13 C content and current cycle biomass 12 C content; Fossil fuels are calculated based on the standard values ​​of fossil fuel carbon isotope ratios in a pre-set carbon dioxide isotope fingerprint database. 13 C content and fossil fuels 12 C content; Based on the current cycle of biomass 13 C content, current cycle biomass 12 C content, fossil fuels 13 C content, fossil fuels 12 Using the C content, the total carbon emissions, and the total carbon isotope ratio, solve the following equations to obtain the biomass carbon emissions and fossil fuel carbon emissions: In the formula, For biomass carbon emissions; Carbon emissions from fossil fuels; Total carbon emissions; The percentage of total carbon isotopes; For the current cycle of biomass 13 C content; For the current cycle of biomass 12 C content; fossil fuel 13 C content; fossil fuel 12 C content.

9. The carbon emission adjustment method based on carbon dioxide isotope fingerprint characteristics according to claim 1, characterized in that, The adjustment of the fuel blending ratio for the next cycle of fuel power plants based on fossil fuel carbon emissions includes: Collect the power generation of fuel power plants for the current period; The ratio of fossil fuel carbon emissions to the electricity generated by the fuel power plant is defined as the fossil fuel carbon emission factor. Calculate the difference in carbon factor between the stated fossil fuel and the preset standard for carbon factor of fossil fuel; When the difference in the electric carbon factor is greater than a preset difference threshold, the fuel blending ratio for the next cycle is adjusted.

10. A carbon emission adjustment device based on carbon dioxide isotope fingerprint characteristics, characterized in that, include: The module includes an isotope detection module, a similarity calculation module, a first ratio correction module, a second ratio correction module, and a carbon emission adjustment module. The isotope detection module is used to collect the total carbon isotope ratio and total carbon emissions in the emitted flue gas in real time during fuel combustion; wherein the fuel includes biomass and fossil fuels; The similarity calculation module is used to calculate the similarity between the carbon isotope ratio of biomass in the previous period and the standard value of carbon isotope ratio of each biomass in the preset carbon dioxide isotope fingerprint database when the type of biomass in the fuel changes in the current period based on the carbon isotope ratio of biomass in the previous period, the fuel blending ratio in the current period, and the total carbon isotope ratio. Biomass corresponding to the standard value of carbon isotope ratio of biomass with a similarity greater than the preset similarity is selected as candidate biomass. The first ratio correction module is used to determine the carbon isotope ratio standard value of the candidate biomass as the carbon isotope ratio of the biomass in the current period when there is only one candidate biomass. The second ratio correction module is used to calculate the carbon isotope ratio of the current period biomass based on the standard value of the carbon isotope ratio of each candidate biomass and the corresponding weighting coefficient when there are multiple candidate biomass. The carbon emission adjustment module is used to calculate the fossil fuel carbon emissions based on the carbon isotope ratio of biomass in the current cycle, the standard value of fossil fuel carbon isotope ratio in the preset carbon dioxide isotope fingerprint database, the total carbon emissions, and the total carbon isotope ratio, and to adjust the fuel blending ratio of the fuel power plant in the next cycle based on the fossil fuel carbon emissions.

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