Sintering main exhaust fan energy efficiency evaluation method, device and equipment and storage medium

Abstract

The invention provides a sintering main exhaust fan energy efficiency evaluation method, device and equipment and a storage medium, and aims to overcome the limitation that an existing evaluation method is single in index, fuzzy in reference and incapable of quantifying each technical contribution degree. The method comprises the following steps: acquiring operation data of a historical reference period before the energy-saving system is put into operation, and calculating reference line indexes of power consumption per ton of sinter and comprehensive energy consumption; operation data of an evaluation period after commissioning is obtained, the evaluation period and a historical reference period are statistical periods with the same time length, and energy type and carbon effect type indexes of the evaluation period are calculated; and comparing the indexes and generating a visual evaluation report. According to the method, the comprehensive energy consumption scale and the carbon efficiency index are established, so that energy and carbon emission two-dimensional evaluation is realized; the data comparability is ensured through the matching period and the same-caliber statistics; and finally, an integrated report is generated, the data is converted into visual decision information, and a standardized assessment normal form is provided for energy-saving technology optimization and carbon asset management.

Description

Technical Field

[0001] This invention relates to the field of sintering technology, and in particular to a method, apparatus, equipment and storage medium for evaluating the energy efficiency of a sintering main exhaust fan. Background Technology

[0002] With the deepening implementation of the "dual carbon" goals, energy-saving renovation projects in the sintering process not only focus on electricity savings but also on carbon emission reduction benefits. Currently, the evaluation of the energy-saving effect of the main exhaust fan faces the following problems: (1) Single indicator: Usually only the electricity consumption per ton of sinter or the total electricity saving is considered, and the electricity and the recovered residual energy are not accounted for as comprehensive energy consumption. There is also a lack of carbon emission assessment indicators, so the project's contribution to reducing comprehensive energy consumption and carbon emissions is not fully reflected. (2) Unclear contribution: When the system integrates multiple energy-saving technologies (such as intelligent control, high-efficiency impeller, and waste energy recovery), it is impossible to quantify the contribution ratio of each technology to the total energy-saving effect, which is not conducive to the optimization and comparison of technical solutions; (3) Vague baseline: The assessment lacks a scientific and universally accepted baseline energy consumption line, making it difficult to compare the assessment results of different projects horizontally; (4) Lack of carbon efficiency perspective: The assessment process failed to systematically convert energy savings into carbon emission reductions, which could not meet the emerging needs of enterprises such as carbon inventory, carbon trading and green finance.

[0003] In view of this, it is necessary to propose a method, apparatus, equipment and storage medium for evaluating the energy efficiency of sintering main exhaust fan in order to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0004] The main objective of this invention is to provide a method, apparatus, equipment, and storage medium for evaluating the energy efficiency of a sintering main exhaust fan, in order to solve the technical problems of how to determine the evaluation benchmark, how to construct a comprehensive evaluation dimension, and how to standardize the evaluation process.

[0005] To achieve the above objectives, the present invention provides a method for evaluating the energy efficiency of a sintering main exhaust fan, comprising the following steps: S1, Obtain the first operating data of the energy-saving system within the historical benchmark period before it is put into operation, and calculate the benchmark index based on the first operating data; wherein, the benchmark index includes the electricity consumption per benchmark ton of sinter and the comprehensive energy consumption per benchmark ton of sinter; S2, Obtain the second operating data of the energy-saving system during the evaluation period after it is put into operation; wherein, the evaluation period and the historical benchmark period are statistical periods of the same length; S3, calculate energy-related indicators for the assessment period based on the second operating data; and calculate carbon efficiency-related indicators for the assessment period based on the second operating data and the baseline indicators. S4. Compare the baseline indicators with the energy and carbon efficiency indicators for the assessment period, and generate an assessment report.

[0006] Preferably, step S1 includes the following steps: S11, acquire historical operating data within at least one complete statistical period before the energy-saving system is put into operation as the first operating data; wherein, the statistical period is a natural year or a preset fixed duration period; wherein, the first operating data includes one or more of the following: historical total power consumption of the main exhaust fan high-pressure side, historical total output of sintered ore, and historical total steam production of the waste heat boiler. S12, calculate the benchmark power consumption per ton of sinter based on the total power consumption of the high-pressure side of the historical main exhaust fan and the total output of the historical sinter. S13. Based on the historical total power consumption of the main exhaust fan on the high-pressure side, the historical total output of sinter, the historical total steam production of the waste heat boiler, the electricity-to-standard-coal conversion factor, and the steam-to-standard-coal conversion factor, the comprehensive energy consumption per ton of sinter is calculated; wherein, the benchmark index includes the electricity consumption per ton of sinter and the comprehensive energy consumption per ton of sinter.

[0007] Preferably, step S2 includes the following steps: The actual operating data of the energy-saving system within a complete statistical period after its commissioning is obtained as the second operating data; wherein, the statistical period is a natural year or a preset fixed-duration period; the second operating data includes the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, and the actual total steam production of the waste heat boiler, which are statistically analyzed with the same caliber as the first operating data; The "same caliber statistics" means that the measurement points, statistical periods, and conversion standards of each data item in the second operating data are consistent with the rules used when obtaining the first operating data.

[0008] Preferably, the first operating data obtained in step S1 further includes the historical baseline cycle average trolley speed; The second operating data obtained in step S2 also includes the average trolley speed during the evaluation period; Before step S3, the following step is also included: S2a, based on the historical baseline average trolley speed and the evaluation period average trolley speed, the baseline indicators and / or the energy and carbon efficiency indicators are corrected to eliminate the impact of differences in production intensity.

[0009] Preferably, step S3 includes the following steps: S31. Based on the actual total power consumption of the main exhaust fan on the high-pressure side and the actual total output of sinter, the power consumption per ton of sinter during the evaluation period is calculated. S32. Based on the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, the actual total steam output of the waste heat boiler, the standard coal conversion factor of electricity, and the standard coal conversion factor of steam, the comprehensive energy consumption per ton of sintered ore during the evaluation period is calculated. S33. Based on the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, the actual total steam output of the waste heat boiler, the power grid carbon emission factor, and the steam carbon emission factor, the carbon emission per ton of sintered ore during the assessment period is calculated. S34. Based on the comprehensive energy consumption per ton of sinter at the benchmark, the comprehensive energy consumption per ton of sinter at the assessment period, the actual total output of sinter, and the standard coal carbon emission factor, the total carbon dioxide emission reduction during the assessment period is calculated. The energy-related indicators include the electricity consumption per ton of sinter during the assessment period and the comprehensive energy consumption per ton of sinter during the assessment period. The carbon efficiency indicators include the carbon emissions per ton of sinter during the assessment period and the total carbon dioxide emission reduction during the assessment period.

[0010] Preferably, the method further includes the step of obtaining the technology contribution rate index in step S3, specifically including the following steps: A digital twin model is established based on the energy-saving system; In the digital twin model, the energy-saving system is simulated to operate in a complete energy-saving state to obtain the first simulated energy consumption; then, the system is simulated to shut down a predetermined subsystem in the energy-saving system and then run again to obtain the corresponding second simulated energy consumption; wherein, the predetermined subsystem is one or more of the control subsystem, equipment subsystem, and waste energy recovery subsystem. Based on the difference between the first simulated energy consumption and each of the second simulated energy consumptions, the energy contribution of each predetermined subsystem is calculated. The historical total power consumption of the main exhaust fan on the high-pressure side based on the first operating data is used as the baseline total power consumption. The total energy saved is obtained by calculating the difference between the first simulated energy consumption and the baseline total power consumption; The technical contribution rate of each predetermined subsystem is calculated based on the ratio of the energy saved by each predetermined subsystem to the total energy saved. The technology contribution rate indicator includes the energy saving contribution and / or the technology contribution rate.

[0011] Preferably, step S4 includes the following steps: The differences between the baseline indicators and the energy and carbon efficiency indicators corresponding to the assessment period are compared and calculated, and a visual assessment report is generated based on the differences. The visualization assessment report shall include at least: a bar chart or trend chart reflecting the comparison between the baseline indicator and the energy indicators of the assessment period; a quantitative value reflecting the total carbon dioxide emission reduction in the carbon efficiency indicators of the assessment period; and a pie chart reflecting the proportion of the technical contribution rate of each predetermined subsystem within the energy-saving system.

[0012] The present invention also provides an energy efficiency evaluation device for a sintering main exhaust fan, used to perform the energy efficiency evaluation method for a sintering main exhaust fan as described above, comprising: The data acquisition unit is used to acquire the first operating data of the energy-saving system within a historical benchmark period before it is put into operation, and to calculate the benchmark index based on the first operating data; it is also used to acquire the second operating data of the energy-saving system during the evaluation period after it is put into operation; wherein the evaluation period and the historical benchmark period are statistical periods of the same length. The indicator calculation unit is used to calculate energy-related indicators during the evaluation period based on the second operating data; and to calculate carbon efficiency-related indicators during the evaluation period based on the second operating data and the baseline indicator. The report generation unit is used to compare the baseline indicators with the energy and carbon efficiency indicators of the assessment period and generate an assessment report.

[0013] The present invention also provides an energy efficiency evaluation device for a sintering main exhaust fan, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the energy efficiency evaluation method for the sintering main exhaust fan as described above.

[0014] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for evaluating the energy efficiency of a sintering main exhaust fan.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a method, apparatus, equipment, and storage medium for evaluating the energy efficiency of a sintering main exhaust fan. Based on the first operating data within a historical benchmark period, it calculates not only the traditional electricity consumption per ton of sinter but also the comprehensive energy consumption per ton of sinter. A comprehensive energy efficiency evaluation benchmark covering multiple energy forms is established at the benchmark stage, solving the problem of single indicators in existing technologies. By using the evaluation period and the historical benchmark period as statistical periods of equal length (such as a calendar year or a complete statistical period), the comparability of the production conditions and seasonal cycles covered by the data is ensured. Carbon efficiency indicators and energy indicators are used as core indicators, expanding from the traditional energy dimension to a dual dimension of energy + carbon, enabling the evaluation results to directly serve the dual-carbon strategy needs such as carbon inventory and carbon trading. By comparing the benchmark indicators with the evaluation period indicators, a visual evaluation report is automatically generated, including indicator comparison charts, quantified carbon emission reduction values, and technology contribution rate analysis. This transforms the originally scattered data into intuitive and easy-to-understand decision-making information, greatly improving the readability of the evaluation results and providing profound insights to guide subsequent technology optimization and investment decisions. Furthermore, it forms a standardized and structured evaluation report output paradigm. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a flow chart of the sintering process in one embodiment of the present invention; Figure 2 This is a schematic diagram of a process in one embodiment of the present invention; Figure 3 This is a flowchart illustrating step S3 in one embodiment of the present invention.

[0018] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0023] Please see the appendix Figures 1 to 3 An energy efficiency evaluation method for a sintering main exhaust fan, provided in one embodiment of the present invention, includes the following steps: S1, Obtain the first operating data of the energy-saving system within the historical benchmark period before it is put into operation, and calculate the benchmark index based on the first operating data; wherein, the benchmark index includes the electricity consumption per benchmark ton of sinter and the comprehensive energy consumption per benchmark ton of sinter; S2, Obtain the second operating data of the energy-saving system during the evaluation period after it is put into operation; wherein, the evaluation period and the historical benchmark period are statistical periods of the same length; S3, calculate energy-related indicators for the assessment period based on the second operating data; and calculate carbon efficiency-related indicators for the assessment period based on the second operating data and the baseline indicators. S4. Compare the baseline indicators with the energy and carbon efficiency indicators for the assessment period, and generate an assessment report.

[0024] The method described in this embodiment calculates not only the traditional electricity consumption per ton of sintered ore but also the comprehensive energy consumption per ton of sintered ore based on the first operating data within the historical benchmark period. This establishes a comprehensive energy efficiency evaluation benchmark covering multiple energy forms at the benchmark stage, solving the problem of single indicators in existing technologies. By using the assessment period and the historical benchmark period as the same statistical period (as if they were a complete statistical period), the comparability of the production conditions and seasonal cycles covered by the data is ensured. Carbon efficiency indicators and energy indicators are used as core indicators, expanding from the traditional energy dimension to a dual dimension of energy + carbon, enabling the assessment results to directly serve the dual-carbon strategy needs such as carbon inventory and carbon trading. By comparing the benchmark indicators with the assessment period indicators, a visual assessment report is automatically generated, including indicator comparison charts, quantified carbon emission reduction values, and technology contribution rate analysis. This transforms the originally scattered data into intuitive and easy-to-understand decision-making information, greatly improving the readability of the assessment results and providing profound insights to guide subsequent technology optimization and investment decisions. Furthermore, it forms a standardized and structured assessment report output paradigm.

[0025] In a preferred embodiment, step S1 includes the following steps: S11, acquire historical operating data within at least one complete statistical period before the energy-saving system is put into operation as the first operating data; wherein, the statistical period is a natural year or a preset fixed duration period; wherein, the first operating data includes one or more of the following: historical total power consumption of the main exhaust fan on the high-pressure side, historical total output of sintered ore, and historical total steam production of the waste heat boiler; preferably, the first operating data includes historical total power consumption of the main exhaust fan on the high-pressure side, historical total output of sintered ore, and historical total steam production of the waste heat boiler.

[0026] Specifically, before implementing energy-saving renovation projects, historical operating data for at least one complete statistical period (e.g., from January 1, 2022 to December 31, 2022) should be extracted from the enterprise's data center, energy management system (EMS), distributed control system (DCS), and field metering instruments to ensure coverage of different seasons and production conditions, as follows: S12, the benchmark ton sinter power consumption is calculated based on the historical total power consumption of the main exhaust fan on the high-pressure side and the historical total output of sinter. The benchmark ton sinter power consumption serves as the most direct and fundamental benchmark for evaluating power efficiency, and is used to quantify and compare the changes in direct power consumption per unit product before and after the energy-saving system is put into operation.

[0027] Preferably, the benchmark sintering power consumption per ton is obtained by calculating the ratio of the total power consumption of the high-pressure side of the historical main exhaust fan to the total output of the historical sintering ore, in kWh / t.

[0028] S13. Based on the historical total power consumption of the main exhaust fan on the high-pressure side, the historical total output of sintered ore, the historical total steam production of the waste heat boiler, the standard coal equivalent coefficient of electricity, and the standard coal equivalent coefficient of steam, the comprehensive energy consumption per ton of sintered ore is calculated, in units of kgce / t.

[0029] The benchmark energy consumption per ton of sintered ore serves as a comprehensive and systematic benchmark for energy efficiency evaluation, used to quantify and compare changes in the overall energy utilization efficiency of energy-saving systems. This indicator establishes a unified measurement scale covering multiple energy inputs by uniformly converting different forms of energy, such as electricity consumption and waste heat recovery, into standard coal equivalent. Secondly, as benchmark data for calculating total carbon emission reductions, its changes are converted into reportable and tradable carbon asset data through conversion with the carbon emission factor of standard coal equivalent, thereby supporting carbon efficiency assessment and dual-carbon management.

[0030] Preferably, the formula is used. The comprehensive energy consumption per ton of sinter was calculated. ,in, The total power consumption of the high-pressure side of the main exhaust fan in history, For the total steam production of historical waste heat boilers, The standard coal equivalent coefficient for electricity is 0.1229 kgce / kWh (equivalent value). This is the standard coal equivalent coefficient for steam, determined by referring to the enthalpy-entropy table based on steam pressure and temperature. For example, for saturated steam at 1.6 MPa, it can be taken as 0.1286 kgce / kg. This represents the total historical output of sintered ore.

[0031] In a preferred embodiment, step S2 includes the following steps: The actual operating data of the energy-saving system within a complete statistical period after its commissioning is obtained as the second operating data; wherein, the statistical period is a natural year or a preset fixed-duration period; the second operating data includes the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, and the actual total steam production of the waste heat boiler, which are statistically analyzed with the same caliber as the first operating data; The "same caliber statistics" means that the measurement points, statistical periods, and conversion standards of each data item in the second operating data are consistent with the rules used when obtaining the first operating data, thus eliminating calculation deviations caused by updates to standards, specifications, or parameter versions.

[0032] Specifically, after the energy-saving system is put into operation and stabilizes, operating data for a complete statistical period (e.g., from 00:00 on January 1, 2023 to 24:00 on December 31, 2023) is continuously collected as evaluation period data. The collected data items correspond to the baseline period data items defined in step S1.

[0033] Preferably, the first operating data obtained in step S1 further includes the historical baseline cycle average trolley speed; The second operating data obtained in step S2 also includes the average trolley speed during the evaluation period; Before step S3, the following step is also included: S2a, based on the historical baseline average trolley speed and the evaluation period average trolley speed, the baseline indicators and / or the energy and carbon efficiency indicators are corrected to eliminate the impact of differences in production intensity.

[0034] Specifically, based on the average trolley speed of the historical baseline period and the average trolley speed of the actual evaluation period, the baseline indicators and / or the energy and carbon efficiency indicators are corrected (e.g., normalized) to eliminate the impact of differences in production intensity.

[0035] In a preferred embodiment, step S3 includes the following steps: S31. Based on the actual total power consumption of the main exhaust fan on the high-pressure side and the actual total output of sinter, the power consumption per ton of sinter during the evaluation period is calculated, in kWh / t. Preferably, the power consumption per ton of sinter during the evaluation period is the ratio between the actual total power consumption of the main exhaust fan on the high-pressure side and the actual total output of sinter. By directly comparing the power consumption per ton of sinter during the evaluation period with the benchmark power consumption per ton of sinter, the energy-saving effect can be directly reflected.

[0036] S32. Based on the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sinter, the actual total steam output of the waste heat boiler, the standard coal conversion factor of electricity, and the standard coal conversion factor of steam, the comprehensive energy consumption per ton of sinter during the evaluation period is calculated, in units of kgce / t. Preferably, the formula is used. The comprehensive energy consumption per ton of sinter during the evaluation period was calculated. ,in, The actual total power consumption of the main exhaust fan on the high-pressure side. The actual total steam production of the waste heat boiler, The standard coal equivalent coefficient for electricity is 0.1229 kgce / kWh (equivalent value). This is the standard coal equivalent coefficient for steam, determined by referring to the enthalpy-entropy table based on steam pressure and temperature. For example, for saturated steam at 1.6 MPa, it can be taken as 0.1286 kgce / kg. The total energy consumption per ton of sinter during the evaluation period can be directly reflected by comparing the comprehensive energy consumption per ton of sinter with the benchmark comprehensive energy consumption per ton of sinter, which represents the actual total output of sinter.

[0037] This step quantifies the energy recovered from waste heat and incorporates it into the comprehensive energy consumption calculation per ton of sinter during the evaluation period, thus solving the problem of one-sided evaluation in existing technologies.

[0038] S33. Based on the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, the actual total steam output of the waste heat boiler, the power grid carbon emission factor, and the steam carbon emission factor, the carbon emission per ton of sintered ore during the assessment period is calculated. Preferably, the formula is used. The carbon emissions per ton of sintered ore during the assessment period were calculated. Unit: kgCO2 / t; where, The actual total power consumption of the main exhaust fan on the high-pressure side is expressed in kWh. The carbon emission factor for the power grid is determined using the latest regional power grid baseline emission factor value (e.g., 0.6810 kg CO2 / kWh for the East China Power Grid). The actual total steam production of the waste heat boiler is expressed in tons (t). The actual total output of sintered ore is expressed in tons (t). This is the carbon emission factor for steam, measured in kgCO2 / kg (or tCO2 / t), and its value is determined based on the source of the steam. (1) For steam derived from the waste heat recovery of the sintering process itself, since it is a utilization of process waste energy, no additional fossil fuel consumption is generated. The value is 0.

[0039] (2) For purchased steam, One of the following values ​​should be used, with the source taking precedence in the order of priority: (a) Carbon emission factor data provided by the steam supplier and verified by a third party; (b) The default steam value in the latest "Guidelines for Greenhouse Gas Emission Accounting" or related technical specifications issued by the provincial ecological and environmental protection department where the project is located; (c) The calculation is based on the fuel emission factors in the “Guidelines for the Compilation of Greenhouse Gas Inventories” and the “Guidelines for the Accounting and Reporting of Greenhouse Gas Emissions of Enterprises” issued by the national or provincial competent authorities, combined with the typical boiler efficiency.

[0040] (3) For cases where purchased steam is mixed with self-generated waste heat steam, the actual total steam production of the waste heat boiler should be considered. Differentiated accounting should be performed. Specifically, the purchased portion can be assigned a non-zero value. Value, or a weighted average based on the proportion of purchased steam for the mixed steam. The value is calculated.

[0041] By converting energy consumption into carbon emissions through carbon emission factors, and generating the carbon emissions per ton of sinter during the assessment period, this data can serve as an important part of a company's carbon inventory report and is also a key parameter for measuring the low-carbon level of a production line.

[0042] S34. Based on the comprehensive energy consumption per ton of sinter at the benchmark, the comprehensive energy consumption per ton of sinter at the assessment period, the actual total output of sinter, and the standard coal carbon emission factor, the total carbon dioxide emission reduction during the assessment period is calculated. Preferably, the formula is used. The total carbon dioxide emission reduction during the assessment period was calculated. Unit: tons of carbon dioxide (tCO2). Among them, The comprehensive energy consumption per ton of sinter is expressed in kgce / t. The comprehensive energy consumption per ton of sintered ore during the assessment period is expressed in kgce / t (kg standard coal). The actual total output of sintered ore is expressed in tons (t). The CO2 emission factor for standard coal is taken as 2.66 tCO2 / tce. The division by 1000 in the formula is used to convert the comprehensive energy consumption unit from kgce (kilograms of standard coal) to tce (tons of standard coal) to match the standard coal carbon emission factor. The unit is (tCO2 / tce).

[0043] By using the standard coal carbon emission factor, the total carbon dioxide emission reduction during the assessment period is finally calculated, providing a direct view of the carbon reduction amount. This data can be used in corporate social responsibility reports, as evidence for applying for government energy conservation and carbon reduction rewards, and also serves as the basis for calculated carbon asset data.

[0044] The energy-related indicators include the electricity consumption per ton of sinter during the assessment period and the comprehensive energy consumption per ton of sinter during the assessment period. The carbon efficiency indicators include the carbon emissions per ton of sinter during the assessment period and the total carbon dioxide emission reduction during the assessment period.

[0045] As a preferred embodiment, the method further includes the step of obtaining the technology contribution rate index in step S3, which specifically includes the following steps: A digital twin model is established based on the energy-saving system. Specifically, the digital twin model is a virtual mapping of the physical entity, control logic and operating environment of the energy-saving system. It includes at least a fan aerodynamic model, a motor and frequency converter drive model, a sintering process model and a pipeline resistance model, so as to simulate the operating energy consumption of the energy-saving system under different control strategies, equipment performance parameters and residual energy recovery states with high fidelity. The establishment of a digital twin model is based on mature modeling methods and tools in this field, and specifically includes the following steps: (1) Model architecture construction: Based on the physical topology and control logic of the energy-saving system, a model framework is built in a general simulation platform (such as MATLAB / Simulink, Ansys Twin Builder or similar industrial digital twin platform), and the data interface and coupling relationship between each sub-model are defined.

[0046] (2) Subsystem model construction: ① Fan aerodynamic model: Based on the fan's factory performance curve (air volume-air pressure-efficiency curve), a mathematical model of its aerodynamic performance is established using polynomial fitting or table lookup interpolation methods.

[0047] ② Motor and frequency converter drive model: Based on the motor nameplate parameters (rated power, voltage, current, efficiency) and the efficiency-load characteristic curve provided by the frequency converter manufacturer, an energy consumption model of the motor drive system is established.

[0048] ③ Sintering process model: Based on the sintering material balance and heat balance theory, and combined with historical production data (such as trolley speed, material layer thickness, and ignition temperature), a steady-state or quasi-steady-state model reflecting the sintering process state (such as exhaust gas temperature and flow rate) is established.

[0049] ④ Pipeline resistance model: Based on the fluid mechanics pipeline resistance calculation formula (such as the Darcy-Weisbach formula), the pipeline resistance characteristics are calculated according to the system pipeline layout, size and valve opening.

[0050] (3) Model verification and correction: Using the historical operating data of the energy-saving system, compare the model output value with the actual monitoring value (such as the main motor power and the main pipe pressure), and calibrate the model parameters through parameter identification (such as the least squares method) to ensure that the model simulation accuracy meets the engineering evaluation requirements (for example, the simulation error of key parameters is within ±5%).

[0051] In the digital twin model, the energy-saving system is simulated to operate in a complete energy-saving state to obtain the first simulated energy consumption; then, the system is simulated to shut down a predetermined subsystem in the energy-saving system and then run again to obtain the corresponding second simulated energy consumption; wherein, the predetermined subsystem is one or more of the control subsystem, equipment subsystem, and waste energy recovery subsystem. Specifically, all parameters in the digital twin model are set to the actual state after the energy-saving system is put into operation (i.e., the complete energy-saving state). A typical operating cycle (e.g., a complete statistical cycle) is input into the digital twin model for simulation calculation to obtain the first simulated energy consumption within that typical operating cycle.

[0052] The energy-saving system is simulated by shutting down a predetermined subsystem in sequence using the item-by-item shutdown method and then running again to obtain the corresponding second simulated energy consumption. Specifically, shut down the control subsystem: for example, disable mature intelligent optimization algorithms in the digital twin model, switch the control logic to the conventional PID control or constant speed operation mode before the modification, and obtain the energy consumption E1 through simulation.

[0053] Replacement of equipment subsystems: For example, in the model, the aerodynamic performance curve of the high-efficiency three-dimensional flow impeller is replaced with the curve of the ordinary impeller before the modification, and the energy consumption E2 is obtained by simulation.

[0054] Shutting down the waste heat recovery subsystem: For example, in the digital twin model, the waste heat recovery device is set to be invalid, and the corresponding energy is not recovered. The simulation yields energy consumption E3.

[0055] Each simulation above only changes one variable to obtain the corresponding second simulated energy consumption.

[0056] Based on the difference between the first simulated energy consumption and each of the second simulated energy consumptions, the energy contribution corresponding to each of the predetermined subsystems is calculated; each difference reflects the additional energy consumed due to the absence of that specific subsystem under exactly the same operating conditions, that is, the absolute contribution value of that subsystem.

[0057] The historical total power consumption of the main exhaust fan on the high-pressure side based on the first operating data is used as the baseline total power consumption. The total energy saving is obtained by calculating the difference between the first simulated energy consumption and the baseline total power consumption; the total energy saving is used to reflect the overall energy saving effect verified by simulation.

[0058] The technical contribution rate of each predetermined subsystem is calculated based on the ratio of the energy saved by each predetermined subsystem to the total energy saved; wherein the technical contribution rate index includes the energy saved and / or the technical contribution rate.

[0059] The dominant energy-saving technologies can be intuitively seen by the technical contribution rate of each predetermined subsystem. For example, the control subsystem contributes 50% of the energy saving, which clearly reveals the role of each predetermined subsystem in the complex energy-saving system and provides profound insights to guide subsequent technology optimization and investment decisions.

[0060] This embodiment constructs a digital twin model and uses a step-by-step shutdown method for simulation to quantify the technical contribution rate of each subsystem in the energy-saving system, including control, equipment, and waste energy recovery.

[0061] Further, step S4 includes the following steps: The differences between the baseline indicators and the energy and carbon efficiency indicators corresponding to the assessment period are compared and calculated, and a visual assessment report is generated based on the differences. The visualization assessment report shall include at least: a bar chart or trend chart reflecting the comparison between the baseline indicator and the energy indicators of the assessment period; a quantitative value reflecting the total carbon dioxide emission reduction in the carbon efficiency indicators of the assessment period; and a pie chart reflecting the proportion of the technical contribution rate of each predetermined subsystem within the energy-saving system.

[0062] This embodiment visually compares energy-related indicators, carbon efficiency indicators, and baseline indicators within the assessment period using the same caliber. For example, it can generate parallel bar charts to clearly and intuitively observe changes. The precisely quantified carbon emission reduction results can be directly used in corporate carbon inventory reports, providing a solid data foundation for future participation in carbon trading, applications for green loans, or government incentives. The pie chart format clearly displays the technological contribution rate of each predetermined subsystem, making it intuitive and easy to understand. Through the decomposition of technological contribution rates, the relative importance of each subsystem in the complex energy-saving system is clearly revealed, providing profound insights to guide subsequent technology optimization and investment decisions, and forming a standardized and structured paradigm for assessment report output.

[0063] The present invention also provides an energy efficiency evaluation device for a sintering main exhaust fan, used to perform the energy efficiency evaluation method for a sintering main exhaust fan as described above, comprising: The data acquisition unit is used to acquire the first operating data of the energy-saving system within the historical benchmark period before its commissioning, and to calculate the benchmark indicators based on the first operating data; wherein, the benchmark indicators include the electricity consumption per benchmark ton of sinter and the comprehensive energy consumption per benchmark ton of sinter; and to acquire the second operating data of the energy-saving system during the evaluation period after its commissioning; wherein, the evaluation period and the historical benchmark period are statistical periods of the same length. The indicator calculation unit is used to calculate energy-related indicators during the evaluation period based on the second operating data; and to calculate carbon efficiency-related indicators during the evaluation period based on the second operating data and the baseline indicator. The report generation unit is used to compare the baseline indicators with the energy and carbon efficiency indicators of the assessment period and generate an assessment report.

[0064] The present invention also provides an energy efficiency evaluation device for a sintering main exhaust fan, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the energy efficiency evaluation method for the sintering main exhaust fan as described above.

[0065] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for evaluating the energy efficiency of a sintering main exhaust fan.

[0066] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0067] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for evaluating the energy efficiency of a sintering main exhaust fan, characterized in that, Includes the following steps: S1, Obtain the first operating data of the energy-saving system within the historical baseline period before it is put into operation, and calculate the baseline index based on the first operating data; S2, Obtain the second operating data of the energy-saving system during the evaluation period after it is put into operation; wherein, the evaluation period and the historical benchmark period are statistical periods of the same length; S3, calculate energy-related indicators for the assessment period based on the second operating data; and calculate carbon efficiency-related indicators for the assessment period based on the second operating data and the baseline indicators. S4. Compare the baseline indicators with the energy and carbon efficiency indicators for the assessment period, and generate an assessment report.

2. The energy efficiency evaluation method for the sintering main exhaust fan according to claim 1, characterized in that, Step S1 includes the following steps: S11, acquire historical operating data within at least one complete statistical period before the energy-saving system is put into operation as the first operating data; wherein, the statistical period is a natural year or a preset fixed duration period; wherein, the first operating data includes one or more of the following: historical total power consumption of the main exhaust fan high-pressure side, historical total output of sintered ore, and historical total steam production of the waste heat boiler. S12, calculate the benchmark power consumption per ton of sinter based on the total power consumption of the high-pressure side of the historical main exhaust fan and the total output of the historical sinter. S13. Based on the historical total power consumption of the main exhaust fan on the high-pressure side, the historical total output of sinter, the historical total steam production of the waste heat boiler, the electricity-to-standard-coal conversion factor, and the steam-to-standard-coal conversion factor, the comprehensive energy consumption per ton of sinter is calculated; wherein, the benchmark index includes the electricity consumption per ton of sinter and the comprehensive energy consumption per ton of sinter.

3. The energy efficiency evaluation method for the sintering main exhaust fan according to claim 2, characterized in that, Step S2 includes the following steps: The actual operating data of the energy-saving system within a complete statistical period after its commissioning is obtained as the second operating data; wherein, the statistical period is a natural year or a preset fixed-duration period; the second operating data includes the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, and the actual total steam production of the waste heat boiler, which are statistically analyzed with the same caliber as the first operating data; The "same caliber statistics" means that the measurement points, statistical periods, and conversion standards of each data item in the second operating data are consistent with the rules used when obtaining the first operating data.

4. The energy efficiency evaluation method for the sintering main exhaust fan according to claim 1 or 2, characterized in that, The first operating data obtained in step S1 also includes the historical baseline cycle average trolley speed. The second operating data obtained in step S2 also includes the average trolley speed during the evaluation period; Before step S3, the following step is also included: S2a, based on the historical baseline average trolley speed and the evaluation period average trolley speed, the baseline indicators and / or the energy and carbon efficiency indicators are corrected to eliminate the impact of differences in production intensity.

5. The energy efficiency evaluation method for the sintering main exhaust fan according to claim 3, characterized in that, Step S3 includes the following steps: S31. Based on the actual total power consumption of the main exhaust fan on the high-pressure side and the actual total output of sinter, the power consumption per ton of sinter during the evaluation period is calculated. S32. Based on the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, the actual total steam output of the waste heat boiler, the standard coal conversion factor of electricity, and the standard coal conversion factor of steam, the comprehensive energy consumption per ton of sintered ore during the evaluation period is calculated. S33. Based on the actual total power consumption of the main exhaust fan on the high-pressure side, the actual total output of sintered ore, the actual total steam output of the waste heat boiler, the power grid carbon emission factor, and the steam carbon emission factor, the carbon emission per ton of sintered ore during the assessment period is calculated. S34. Based on the comprehensive energy consumption per ton of sinter at the benchmark, the comprehensive energy consumption per ton of sinter at the assessment period, the actual total output of sinter, and the standard coal carbon emission factor, the total carbon dioxide emission reduction during the assessment period is calculated. The energy-related indicators include the electricity consumption per ton of sinter during the assessment period and the comprehensive energy consumption per ton of sinter during the assessment period. The carbon efficiency indicators include the carbon emissions per ton of sinter during the assessment period and the total carbon dioxide emission reduction during the assessment period.

6. The energy efficiency evaluation method for the sintering main exhaust fan according to claim 5, characterized in that, It also includes the step of obtaining the technology contribution rate indicator in step S3, which specifically includes the following steps: A digital twin model is established based on the energy-saving system; In the digital twin model, the energy-saving system is simulated to operate in a complete energy-saving state to obtain the first simulated energy consumption; then, the system is simulated to shut down a predetermined subsystem in the energy-saving system and then run again to obtain the corresponding second simulated energy consumption; wherein, the predetermined subsystem is one or more of the control subsystem, equipment subsystem, and waste energy recovery subsystem. Based on the difference between the first simulated energy consumption and each of the second simulated energy consumptions, the energy contribution of each predetermined subsystem is calculated. The historical total power consumption of the main exhaust fan on the high-pressure side based on the first operating data is used as the baseline total power consumption. The total energy saved is obtained by calculating the difference between the first simulated energy consumption and the baseline total power consumption; The technical contribution rate of each predetermined subsystem is calculated based on the ratio of the energy saved by each predetermined subsystem to the total energy saved. The technology contribution rate indicator includes the energy saving contribution and / or the technology contribution rate.

7. The energy efficiency evaluation method for the sintering main exhaust fan according to claim 6, characterized in that, Step S4 includes the following steps: The differences between the baseline indicators and the energy and carbon efficiency indicators corresponding to the assessment period are compared and calculated, and a visual assessment report is generated based on the differences. The visualization assessment report shall include at least: a bar chart or trend chart reflecting the comparison between the baseline indicator and the energy indicators of the assessment period; a quantitative value reflecting the total carbon dioxide emission reduction in the carbon efficiency indicators of the assessment period; and a pie chart reflecting the proportion of the technical contribution rate of each predetermined subsystem within the energy-saving system.

8. A device for evaluating the energy efficiency of a sintering main exhaust fan, used to perform the energy efficiency evaluation method for a sintering main exhaust fan as described in any one of claims 1-7, characterized in that, include: The data acquisition unit is used to acquire the first operating data of the energy-saving system within a historical benchmark period before it is put into operation, and to calculate the benchmark index based on the first operating data; it is also used to acquire the second operating data of the energy-saving system during the evaluation period after it is put into operation; wherein the evaluation period and the historical benchmark period are statistical periods of the same length. The indicator calculation unit is used to calculate energy-related indicators during the evaluation period based on the second operating data; and to calculate carbon efficiency-related indicators during the evaluation period based on the second operating data and the baseline indicator. The report generation unit is used to compare the baseline indicators with the energy and carbon efficiency indicators of the assessment period and generate an assessment report.

9. An energy efficiency evaluation device for a sintering main exhaust fan, characterized in that, The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the energy efficiency evaluation method for the sintering main exhaust fan as described in any one of claims 1 to 7.

10. A storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the energy efficiency evaluation method for a sintering main exhaust fan as described in any one of claims 1 to 7.

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