A Low-Carbon Remanufacturing Evaluation Method and System for Boiler Pipe Fittings

Abstract

The present invention relates to the field of data modeling evaluation and analysis. A method and system for evaluating the low-carbon remanufacturing of boiler pipe fittings are proposed. By using a modal analysis algorithm to obtain the natural frequency of the boiler pipe fittings, the influence of cracks on the natural frequency is determined, and the accurate judgment of the damage degree of the boiler pipe fittings is realized. Thus, the quality grade of the boiler pipe fittings can be accurately judged, the cost of manual damage judgment is saved, and the evaluation efficiency is improved. Then, by designing a carbon emission model, the carbon emissions of the boiler pipe fittings throughout the life cycle are calculated, avoiding the influence of complex emission sources and improving the calculation efficiency. At the same time, energy consumption correction is carried out according to the quality grade, further improving the accuracy of the calculation to achieve the accurate judgment of the environmental protection grade of the boiler pipe fittings. Finally, a comprehensive evaluation is carried out by combining the quality grade and environmental protection grade of the boiler pipe fittings, so that the decision of the evaluation result is more in line with the actual situation. The present invention improves the accuracy and comprehensiveness of the method for evaluating the low-carbon remanufacturing of boiler pipe fittings.

Description

Technical Field

[0001] The present invention relates to the field of data modeling evaluation and analysis, and particularly relates to a method and system for evaluating low-carbon remanufacturing of boiler pipe fittings. Background Art

[0002] In the prior art, the recovery and treatment of boiler pipe fittings often adopt the method of manual evaluation to judge whether the state of the boiler pipe fittings is for remanufacturing or scrapping. However, the accuracy and comprehensiveness of manual evaluation are insufficient, and it is impossible to effectively associate the quality grade and environmental protection grade of the recovered boiler pipe fittings. At the same time, the efficiency of manual evaluation is low, and it is difficult to meet the growing recovery demand.

[0003] Therefore, how to design a method for evaluating low-carbon remanufacturing of boiler pipe fittings to improve the accuracy and comprehensiveness of evaluation has become an urgent problem to be solved. Summary of the Invention

[0004] Based on this, a method and system for evaluating low-carbon remanufacturing of boiler pipe fittings proposed by the present invention obtain the natural frequencies of the boiler pipe fittings through the modal analysis algorithm, determine the influence of cracks on the natural frequencies, and realize the accurate judgment of the damage degree of the boiler pipe fittings, thereby accurately judging the quality grade of the boiler pipe fittings, saving the cost of manual damage judgment, and improving the evaluation efficiency. Then, by designing a carbon emission model, the carbon emissions of the boiler pipe fittings throughout the life cycle are calculated, avoiding the influence of complex emission sources and improving the calculation efficiency. At the same time, energy consumption correction is carried out according to the quality grade, further improving the accuracy of the calculation to realize the accurate judgment of the environmental protection grade of the boiler pipe fittings. Finally, a comprehensive evaluation is carried out by combining the quality grade and environmental protection grade of the boiler pipe fittings, so that the decision of the evaluation result is more in line with the actual situation. The present invention improves the accuracy and comprehensiveness of the method for evaluating low-carbon remanufacturing of boiler pipe fittings.

[0005] A method for evaluating low-carbon remanufacturing of boiler pipe fittings proposed by the present invention includes:

[0006] Obtain multiple natural frequencies of the target boiler pipe fittings according to the modal analysis algorithm, and each of the natural frequencies has a uniquely corresponding fatigue stage;

[0007] Judge the quality grade of the target boiler pipe fittings according to the natural frequencies, and the quality grade judgment is based on the damage degree of the target boiler pipe fittings;

[0008] Construct carbon emission models for the target boiler pipe fittings with different quality grades respectively to calculate and obtain the carbon emissions of the target boiler pipe fittings with different quality grades. The construction of the carbon emission model is based on the carbon emission characteristics of the boiler pipe fittings throughout the life cycle, and the carbon emissions are calculated according to the carbon emission factor method.

[0009] Judging the environmental protection level of the target boiler pipe fittings according to the carbon emissions, and the environmental protection level judgment is based on the environmental protection benefit standard;

[0010] Conduct a comprehensive evaluation based on the quality level and environmental protection level of the target boiler pipe fittings to obtain the final evaluation result, and the comprehensive evaluation is based on the fuzzy evaluation algorithm.

[0011] In summary, according to the above-mentioned low-carbon remanufacturing evaluation method for boiler pipe fittings, the natural frequencies of the boiler pipe fittings are obtained through the modal analysis algorithm, the influence of cracks on the natural frequencies is determined, and the accurate judgment of the damage degree of the boiler pipe fittings is realized. Thus, the quality level of the boiler pipe fittings is accurately judged, the cost of manual damage judgment is saved, and the evaluation efficiency is improved. Then, by designing a carbon emission model, the carbon emissions of the boiler pipe fittings throughout the life cycle are calculated, the influence of complex emission sources is avoided, and the calculation efficiency is improved. At the same time, the energy consumption is corrected according to the quality level, further improving the accuracy of the calculation to achieve the accurate judgment of the environmental protection level of the boiler pipe fittings. Finally, a comprehensive evaluation is carried out in combination with the quality level and environmental protection level of the boiler pipe fittings, so that the decision-making of the evaluation result is more in line with the actual situation. The present invention improves the accuracy and comprehensiveness of the low-carbon remanufacturing evaluation method for boiler pipe fittings. Specifically, according to the modal analysis algorithm, multiple natural frequencies of the target boiler pipe fittings are obtained, and each natural frequency has a uniquely corresponding fatigue stage. The quality level of the target boiler pipe fittings is judged according to the natural frequencies, and the quality level judgment is based on the damage degree of the target boiler pipe fittings, realizing the accurate judgment of the damage degree of the boiler pipe fittings, thus accurately judging the quality level of the boiler pipe fittings, saving the cost of manual damage judgment, and improving the evaluation efficiency. The carbon emission models are constructed for the target boiler pipe fittings with different quality levels respectively to calculate and obtain the carbon emissions of the target boiler pipe fittings with different quality levels. The carbon emission model construction is based on the carbon emission characteristics of the boiler pipe fittings throughout the life cycle, and the carbon emissions are calculated according to the carbon emission factor method, avoiding the influence of complex emission sources and improving the calculation efficiency. At the same time, the energy consumption is corrected according to the quality level, further improving the accuracy of the calculation to achieve the accurate judgment of the environmental protection level of the boiler pipe fittings. The environmental protection level of the target boiler pipe fittings is judged according to the carbon emissions, and the environmental protection level judgment is based on the environmental protection benefit standard. A comprehensive evaluation is carried out based on the quality level and environmental protection level of the target boiler pipe fittings to obtain the final evaluation result, and the comprehensive evaluation is based on the fuzzy evaluation algorithm, making the decision-making of the evaluation result more in line with the actual situation. The present invention improves the accuracy and comprehensiveness of the low-carbon remanufacturing evaluation method for boiler pipe fittings.

[0012] Further, the step of obtaining multiple natural frequencies of the target boiler pipe fittings according to the modal analysis algorithm specifically includes:

[0013] Build a finite element model of the target boiler pipe fitting, where the finite element model includes the crack characteristics of the target boiler pipe fitting, and the crack characteristics include the width, depth, position, and stiffness attenuation of the crack;

[0014] Perform modal analysis on the finite element model of the target boiler pipe fitting, measure the dynamic response parameters at different fatigue stages to obtain multiple natural frequencies of the target boiler pipe fitting, and the modal analysis acts on the fatigue loading process.

[0015] Further, the step of judging the quality grade of the target boiler pipe fitting according to the natural frequency specifically includes:

[0016] Compare the natural frequencies at different fatigue stages to obtain the change in natural frequency;

[0017] Calculate the damage state of the target boiler pipe fitting according to the change in natural frequency to judge the degree of damage of the target boiler pipe fitting;

[0018] Judge the quality grade of the target boiler pipe fitting according to the degree of damage, and the quality grade judgment is based on the offset value of the natural frequency.

[0019] Further, the step of respectively constructing a carbon emission model for target boiler pipe fittings of different quality grades to calculate and obtain the carbon emissions of target boiler pipe fittings of different quality grades specifically includes:

[0020] Obtain the carbon emission characteristics of the whole life cycle of the target boiler pipe fitting, and the whole life cycle includes raw material production stage, manufacturing stage, transportation stage, use stage, recycling stage, and remanufacturing stage;

[0021] Construct a carbon emission model according to the carbon emission characteristics. The construction of the carbon emission model includes determining the system boundary of the boiler pipe fitting manufacturing process and determining the carbon emission sources in each stage of the whole life cycle. The carbon emission sources include material carbon emissions, energy carbon emissions, and waste treatment carbon emissions;

[0022] The carbon emission model determines the influence weight of each stage in the whole life cycle according to the quality grade of the target boiler pipe fitting, and calculates the carbon emissions of each stage based on the carbon emission factor method. The energy consumption value in the use stage is corrected based on the stiffness attenuation.

[0023] Further, the carbon emission model specifically includes:

[0024] Construct a carbon emission model according to the whole life cycle. The specific structure of the carbon emission model is as follows:

[0025] ,

[0026] Among them, Represents the total carbon emissions throughout the life cycle, Represents the carbon emissions during the raw material production stage, Represents the carbon emissions during the manufacturing stage, Represents the carbon emissions during the transportation stage, Represents the carbon emissions during the usage stage, Represents the carbon emissions during the recycling stage, Represents the carbon emissions during the remanufacturing stage;

[0027] The specific calculation formula for the carbon emissions during the raw material production stage is as follows:

[0028] ,

[0029] Wherein, Represents the weight of the target boiler pipe fitting, Represents the carbon emission factor of virgin steel, Represents the utilization rate of recycled materials, Represents the carbon emission factor of recycled steel;

[0030] The specific calculation formula for the carbon emissions during the manufacturing stage is as follows:

[0031] ,

[0032] Wherein, Represents the processing energy consumption, Represents the carbon emission factor of electricity, Represents the damage correction coefficient, and the damage correction coefficient is based on the quality grade;

[0033] The specific calculation formula for the carbon emissions during the usage stage is as follows:

[0034] ,

[0035] Wherein, Represents the boiler thermal power, Represents the service life of the target boiler pipe fitting, Represents the thermal efficiency, and the thermal efficiency is corrected based on the stiffness decay of cracks for adjusting the thermal efficiency decreased due to cracks, Represents the carbon emission factor of fuel;

[0036] The specific calculation formulas for the carbon emissions during the recycling stage and the carbon emissions during the remanufacturing stage are as follows:

[0037] ,

[0038] Wherein, Represents the disassembly carbon emission factor, Represents the remanufacturing carbon emission factor, Represents the remanufacturing ratio.

[0039] Furthermore, the step of judging the environmental protection level of the target boiler pipe fittings according to the carbon emissions specifically includes:

[0040] Analyze the carbon emission characteristics of each stage in the whole life cycle of the target boiler pipe fittings, and calculate the carbon emissions of each stage;

[0041] According to the carbon emissions of each stage of the target boiler pipe fittings, respectively calculate the carbon emissions of new product manufacturing and remanufacturing of the target boiler pipe fittings;

[0042] Compare the carbon emissions of new product manufacturing and remanufacturing of the target boiler pipe fittings, and determine the carbon emission contribution values of all processes and carbon emission sources in each stage of new product manufacturing and remanufacturing;

[0043] Classify the carbon emission contribution values according to the environmental protection benefit standard to obtain the environmental protection level of the target boiler pipe fittings.

[0044] Furthermore, the step of comprehensively evaluating according to the quality level and environmental protection level of the target boiler pipe fittings to obtain the final evaluation result specifically includes:

[0045] Refine the secondary indicators of the quality level and environmental protection level of the target boiler pipe fittings. Refine the secondary indicators of the quality level into tensile strength, surface crack depth and remaining service life years, and refine the secondary indicators of the environmental protection level into the utilization rate of recycled materials, remanufacturing carbon emissions and pollutant discharge compliance rate;

[0046] Determine the weight value of each secondary indicator respectively according to the analytic hierarchy process;

[0047] Fuzzify each secondary indicator to map the secondary indicator to the evaluation level, and calculate the quality comprehensive score and environmental protection comprehensive score of the secondary indicator respectively;

[0048] Obtain the final evaluation result according to the quality comprehensive score and environmental protection comprehensive score.

[0049] A low-carbon remanufacturing evaluation system for boiler pipe fittings proposed by the present invention includes:

[0050] A modal analysis module for obtaining multiple natural frequencies of the target boiler pipe fittings according to the modal analysis algorithm, and each of the natural frequencies has a uniquely corresponding fatigue stage;

[0051] A quality level judgment module for judging the quality level of the target boiler pipe fittings according to the natural frequency, and the quality level judgment is based on the damage degree of the target boiler pipe fittings;

[0052] The carbon emission accounting module is used to construct carbon emission models for target boiler pipe fittings of different quality grades respectively, so as to calculate and obtain the carbon emissions of target boiler pipe fittings of different quality grades. The construction of the carbon emission model is based on the carbon emission characteristics of boiler pipe fittings in the whole life cycle, and the carbon emissions are calculated according to the carbon emission factor method;

[0053] The environmental protection grade judgment module is used to judge the environmental protection grade of the target boiler pipe fittings according to the carbon emissions. The environmental protection grade judgment is based on the environmental protection benefit standard;

[0054] The comprehensive evaluation module is used to conduct a comprehensive evaluation according to the quality grade and environmental protection grade of the target boiler pipe fittings to obtain the final evaluation result. The comprehensive evaluation is based on the fuzzy evaluation algorithm.

[0055] The present invention also provides a storage medium, which stores one or more programs. When the programs are executed by a processor, the low-carbon remanufacturing evaluation method of boiler pipe fittings as described above is implemented.

[0056] The present invention also provides a computer device, which includes a memory and a processor, wherein:

[0057] The memory is used to store computer programs;

[0058] When the processor is used to execute the computer programs stored in the memory, the low-carbon remanufacturing evaluation method of boiler pipe fittings as described above is implemented. Description of the Drawings

[0059] Figure 1 It is a flowchart of the low-carbon remanufacturing evaluation method of boiler pipe fittings proposed in the first embodiment of the present invention;

[0060] Figure 2 It is a structural schematic diagram of the low-carbon remanufacturing evaluation system of boiler pipe fittings proposed in the second embodiment of the present invention;

[0061] Figure 3 It is a finite element model of the low-carbon remanufacturing evaluation method of boiler pipe fittings proposed in the first embodiment of the present invention;

[0062] Figure 4 It is a diagram of the change of the natural frequency in the first fatigue stage of the low-carbon remanufacturing evaluation method of boiler pipe fittings proposed in the first embodiment;

[0063] Figure 5 It is a diagram of the change of the natural frequency in the second fatigue stage of the low-carbon remanufacturing evaluation method of boiler pipe fittings proposed in the first embodiment;

[0064] Figure 6 It is a diagram of the change of the natural frequency in the third fatigue stage of the low-carbon remanufacturing evaluation method of boiler pipe fittings proposed in the first embodiment;

[0065] Figure 7 The graph of the change in the natural frequency in the fourth fatigue stage of the low-carbon remanufacturing evaluation method for boiler pipe fittings proposed for the first embodiment;

[0066] Figure 8 The graph of the change in the natural frequency in the fifth fatigue stage of the low-carbon remanufacturing evaluation method for boiler pipe fittings proposed for the first embodiment;

[0067] Figure 9 The graph of the change in the natural frequency in the sixth fatigue stage of the low-carbon remanufacturing evaluation method for boiler pipe fittings proposed for the first embodiment.

[0068] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0069] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0070] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0072] Please refer to Figure 1 , which shows the flowchart of the low-carbon remanufacturing evaluation method for boiler pipe fittings proposed in the first embodiment of the present invention. This low-carbon remanufacturing evaluation method for boiler pipe fittings includes steps S01 to S05, where:

[0073] Step S01: Obtain multiple natural frequencies of the target boiler pipe fittings according to the modal analysis algorithm;

[0074] It should be noted that in this embodiment, each of the natural frequencies has a uniquely corresponding fatigue stage. A finite element model of the target boiler pipe fitting is constructed, and the finite element model includes the crack characteristics of the target boiler pipe fitting. The crack characteristics include the width, depth, position, and stiffness attenuation of the crack.

[0075] For the finite element model of the boiler pipe fitting in this embodiment, please refer to Figure 3 ;

[0076] Figure 3 In which, x, y, and z respectively represent the positive directions of the x-axis, y-axis, and vertical axis. a represents the crack depth of the boiler pipe fitting, and b, h, L, l respectively represent the width, height, length, and crack distance of the boiler pipe fitting;

[0077] Perform modal analysis on the finite element model of the target boiler pipe fitting, measure the dynamic response parameters in different fatigue stages, so as to obtain multiple natural frequencies of the target boiler pipe fitting. The modal analysis acts on the fatigue loading process;

[0078] For the natural frequency states of the boiler pipe fitting in different fatigue stages in this embodiment, please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 ;

[0079] Determining the influence of crack width, depth, position, and stiffness attenuation on the natural frequency includes:

[0080] According to the calculation of the structural natural frequency originating from the undamped free vibration equation:

[0081] ,

[0082] Among them, K represents the stiffness matrix, M represents the mass matrix, ω represents the angular frequency, and the structural natural frequency is , represents the frequency coefficient. The influence of the crack width, depth, position, and stiffness attenuation on the natural frequency needs to be quantified by modifying the stiffness matrix K . The crack causes a local stiffness decrease, and the modified stiffness matrix can be expressed as:

[0083] ,

[0084] Among them, Δ K is the stiffness attenuation amount caused by the crack. After substituting it into the characteristic equation, the modified natural frequency formula is:

[0085] ,

[0086] Among them, represents the corrected angular frequency;

[0087] Since the width and depth of the crack are usually positively correlated with the local stiffness attenuation Δ K The effective crack length can be described by the following formula:

[0088] ,

[0089] Among them, d is the cross-sectional width, h is the cross-sectional height, α is the empirical coefficient, represents the effective crack length, represents the characteristic length of the structure, and the characteristic length of the structure represents the total length of the structure or the length of the load application.

[0090] Step S02: Judge the quality grade of the target boiler pipe fitting according to the natural frequency;

[0091] It should be noted that in this embodiment, the quality grade judgment is based on the damage degree of the target boiler pipe fitting, comparing the natural frequencies in different fatigue stages to obtain the change in the natural frequency;

[0092] Calculate the damage state of the target boiler pipe fitting according to the change in the natural frequency to judge the damage degree of the target boiler pipe fitting;

[0093] Judge the quality grade of the target boiler pipe fitting according to the damage degree, and the quality grade judgment is based on the offset value of the natural frequency;

[0094] The specific formula for the change in the natural frequency is as follows:

[0095] ,

[0096] Among them, K represents the stiffness, Δ K is the crack width w , depth d and the stiffness attenuation determined jointly by the position, and the mass M is usually not affected by the crack unless the crack causes mass loss;

[0097] The specific calculation formula for the offset value of the natural frequency is as follows:

[0098] ,

[0099] Among them, represents the natural frequency offset value, represents the theoretically calculated frequency offset, represents the actually measured frequency offset value, and performs hierarchical judgment according to the range of the natural frequency offset value, When ≤ 5%, the quality grade is excellent, 5% < ≤ 10% and the quality grade is good, > 10% and the quality grade is poor.

[0100] Step S03: Construct carbon emission models for target boiler pipe fittings of different quality grades respectively to calculate and obtain the carbon emissions of target boiler pipe fittings of different quality grades;

[0101] It should be noted that in this embodiment, the construction of the carbon emission model is based on the carbon emission characteristics of boiler pipe fittings in the whole life cycle. The carbon emissions are calculated according to the carbon emission factor method to obtain the carbon emission characteristics of target boiler pipe fittings in the whole life cycle. The whole life cycle includes the raw material production stage, the manufacturing stage, the transportation stage, the use stage, the recycling stage and the remanufacturing stage;

[0102] Construct a carbon emission model according to the carbon emission characteristics. The construction of the carbon emission model includes determining the system boundary of the boiler pipe fitting manufacturing process and determining the carbon emission sources in each stage of the whole life cycle. The carbon emission sources include material carbon emissions, energy carbon emissions and waste treatment carbon emissions;

[0103] The carbon emission model determines the influence weight of each stage in the whole life cycle according to the quality grade of the target boiler pipe fitting, and calculates the carbon emissions of each stage based on the carbon emission factor method. The energy consumption value in the use stage is corrected based on the stiffness decay;

[0104] The carbon emission model specifically includes:

[0105] Construct a carbon emission model according to the whole life cycle. The specific structure of the carbon emission model is as follows:

[0106] ,

[0107] Among them, represents the total carbon emissions in the whole life cycle, represents the carbon emissions in the raw material production stage, represents the carbon emissions in the manufacturing stage, represents the carbon emissions in the transportation stage, represents the carbon emissions in the use stage, represents the carbon emissions in the recycling stage, represents the carbon emissions in the remanufacturing stage;

[0108] The specific calculation formula for the carbon emissions in the raw material production stage is as follows:

[0109] ,

[0110] wherein, represents the weight of the target boiler pipe fitting; represents the carbon emission factor of virgin steel; represents the recycling material utilization rate; represents the carbon emission factor of recycled steel;

[0111] The specific calculation formula for the carbon emissions in the manufacturing stage is as follows:

[0112] ,

[0113] wherein, represents the processing energy consumption; represents the carbon emission factor of electricity; represents the damage correction coefficient, and the damage correction coefficient is based on the quality grade;

[0114] The specific calculation formula for the carbon emissions in the use stage is as follows:

[0115] ,

[0116] wherein, represents the boiler thermal power; represents the service life of the target boiler pipe fitting; represents the thermal efficiency, and the thermal efficiency is corrected based on the stiffness decay of cracks and is used to adjust the thermal efficiency decreased due to cracks; represents the carbon emission factor of fuel;

[0117] The specific calculation formulas for the carbon emissions in the recycling stage and the remanufacturing stage are as follows:

[0118] ,

[0119] wherein, represents the disassembly carbon emission factor; represents the remanufacturing carbon emission factor; represents the remanufacturing ratio.

[0120] Step S04: Judge the environmental protection level of the target boiler pipe fitting according to the carbon emissions;

[0121] It should be noted that in this embodiment, the environmental protection level judgment is based on the environmental protection benefit standard, and the carbon emission characteristics of each stage in the whole life cycle of the target boiler pipe fitting are analyzed, and the carbon emissions of each stage are calculated and obtained;

[0122] According to the carbon emissions of the target boiler pipe fittings at each stage, calculate the carbon emissions of new product manufacturing and remanufacturing of the target boiler pipe fittings respectively;

[0123] Compare the carbon emissions of new product manufacturing and remanufacturing of the target boiler pipe fittings to determine the carbon emission contribution values of all processes and carbon emission sources in each stage of new product manufacturing and remanufacturing;

[0124] According to the environmental protection benefit standard, conduct environmental protection grading on the carbon emission contribution values to obtain the environmental protection grade of the target boiler pipe fittings;

[0125] In this embodiment, the environmental protection grade is divided into the following three levels:

[0126] National environmental protection benchmark (Grade A): The proportion of recycled steel raw materials is ≥80%, preferably using the electric furnace short process, the carbon emission intensity of raw materials is ≤0.7 tons of carbon dioxide / ton; the remanufacturing rate is ≥90%, the repair process uses low-temperature cold spraying or laser cladding technology, and the energy consumption is 30% lower than that of primary manufacturing; the particulate matter (PM) emission concentration during remanufacturing is ≤10mg / m³, nitrogen oxides (NOx) ≤50mg / m³, meeting the ultra-low emission requirements of the "Technical Code for Energy Conservation and Environmental Protection of Boilers" (TSG 91); the emission of toxic substances such as dioxins reaches the waste gas standard; equipped with an "intelligent management and control integration platform" to achieve full-life cycle carbon footprint tracking and real-time energy efficiency optimization;

[0127] Regional or provincial environmental protection leader (Grade B): The proportion of recycled steel raw materials is 50% - 80%, the carbon emission intensity is ≤1.2 tons of carbon dioxide / ton; the remanufacturing rate is ≥70%, the repair process is mainly traditional cladding, and the energy consumption is 50% of primary manufacturing; the particulate matter emission concentration is ≤30mg / m³, nitrogen oxides ≤100mg / m³, meeting the provincial environmental protection performance grading standard; adopting regionally promoted energy-saving technologies (such as flue gas waste heat recovery, condensing transformation of gas boilers), and the thermal efficiency is increased by ≥5% compared to the benchmark;

[0128] Poor environmental protection (Grade C): The proportion of recycled steel raw materials is <50%, relying on the primary blast furnace steelmaking process, the carbon emission intensity is ≥2.0 tons of carbon dioxide / ton; the remanufacturing rate is <50%, the direct scrapping ratio is high, and the carbon emissions during disassembly are not standardized; the particulate matter emission concentration is >50mg / m³, nitrogen oxides >150mg / m³, exceeding the limit value of the "Energy Efficiency Limit and Energy Efficiency Grade for Industrial Boilers" (GB24500); lacking an intelligent management and control system, the thermal efficiency improvement is less than 3%, and the operating energy consumption is more than 20% higher than the industry average;

[0129] Step S05: Conduct a comprehensive evaluation based on the quality grade and environmental protection grade of the target boiler pipe fittings to obtain the final evaluation result;

[0130] It should be noted that in this embodiment, the comprehensive evaluation is based on the fuzzy evaluation algorithm. The secondary indicators of the quality grade and environmental protection grade of the target boiler pipe fittings are refined. The secondary indicators of the quality grade are refined into tensile strength, surface crack depth, and remaining service life. The secondary indicators of the environmental protection grade are refined into the utilization rate of recycled materials, the carbon emissions of remanufacturing, and the compliance rate of pollutant emissions;

[0131] According to the analytic hierarchy process, the weight values of each secondary indicator are determined respectively;

[0132] The evaluation index system in this embodiment is as shown in Table 1 below:

[0133] Table 1 Evaluation Index System Table

[0134]

[0135] Each secondary indicator is fuzzified to map the secondary indicator to the evaluation grade, and the quality comprehensive score and environmental protection comprehensive score of the secondary indicator are calculated respectively;

[0136] To obtain the final evaluation result according to the quality comprehensive score and environmental protection comprehensive score;

[0137] The specific formulas for calculating the quality comprehensive score and environmental protection comprehensive score of the secondary indicator are as follows:

[0138] ,

[0139] Among them, R is the membership matrix, i and j respectively represent the ordinals of the quality and environmental protection secondary indicators, is the weight value of the secondary indicator, the quality comprehensive score and the environmental protection comprehensive score When both are greater than or equal to 0.8, the quality grade is excellent, the environmental protection grade is A level, and the decision-making plan is to use after direct remanufacturing; the quality comprehensive score and the environmental protection comprehensive score When both are greater than or equal to 0.6 and less than 0.8, the quality grade is good, the environmental protection grade is B level, and the decision-making plan is local repair plus economic verification; the quality comprehensive score and the environmental protection comprehensive score When both are less than 0.6, the quality grade is poor, the environmental protection grade is C level, and the decision-making plan is forced scrapping plus environmental protection treatment.

[0140] In summary, according to the above-mentioned low-carbon remanufacturing evaluation method for boiler pipe fittings, the natural frequencies of the boiler pipe fittings are obtained through the modal analysis algorithm, the influence of cracks on the natural frequencies is determined, and the accurate judgment of the damage degree of the boiler pipe fittings is realized. Thus, the quality grade of the boiler pipe fittings is accurately judged, the cost of manual damage judgment is saved, and the evaluation efficiency is improved. By designing a carbon emission model, the carbon emissions throughout the life cycle of the boiler pipe fittings are calculated, the influence of complex emission sources is avoided, and the calculation efficiency is improved. At the same time, energy consumption correction is carried out according to the quality grade, further improving the accuracy of the calculation to achieve the accurate judgment of the environmental protection grade of the boiler pipe fittings. Finally, a comprehensive evaluation is carried out by combining the quality grade and environmental protection grade of the boiler pipe fittings, so that the decision-making of the evaluation result is more in line with the actual situation. The present invention improves the accuracy and comprehensiveness of the low-carbon remanufacturing evaluation method for boiler pipe fittings. Specifically, according to the modal analysis algorithm, multiple natural frequencies of the target boiler pipe fittings are obtained, and each natural frequency has a uniquely corresponding fatigue stage. The quality grade of the target boiler pipe fittings is judged according to the natural frequency, and the quality grade judgment is based on the damage degree of the target boiler pipe fittings, realizing the accurate judgment of the damage degree of the boiler pipe fittings, thus accurately judging the quality grade of the boiler pipe fittings, saving the cost of manual damage judgment, and improving the evaluation efficiency. Carbon emission models are constructed for target boiler pipe fittings of different quality grades respectively to calculate and obtain the carbon emissions of target boiler pipe fittings of different quality grades. The carbon emission model construction is based on the carbon emission characteristics of the boiler pipe fittings throughout the life cycle, and the carbon emissions are calculated according to the carbon emission factor method, avoiding the influence of complex emission sources and improving the calculation efficiency. At the same time, energy consumption correction is carried out according to the quality grade, further improving the accuracy of the calculation to achieve the accurate judgment of the environmental protection grade of the boiler pipe fittings. The environmental protection grade of the target boiler pipe fittings is judged according to the carbon emissions, and the environmental protection grade judgment is based on the environmental protection benefit standard. A comprehensive evaluation is carried out according to the quality grade and environmental protection grade of the target boiler pipe fittings to obtain the final evaluation result. The comprehensive evaluation is based on the fuzzy evaluation algorithm, making the decision-making of the evaluation result more in line with the actual situation. The present invention improves the accuracy and comprehensiveness of the low-carbon remanufacturing evaluation method for boiler pipe fittings.

[0141] Please refer to Figure 2 , which shows the structural schematic diagram of the low-carbon remanufacturing evaluation system for boiler pipe fittings proposed in the third embodiment of the present invention. The system includes:

[0142] The modal analysis module 10 is used to obtain multiple natural frequencies of the target boiler pipe fittings according to the modal analysis algorithm, and each natural frequency has a uniquely corresponding fatigue stage;

[0143] The quality grade judgment module 20 is used to judge the quality grade of the target boiler pipe fittings according to the natural frequency, and the quality grade judgment is based on the damage degree of the target boiler pipe fittings;

[0144] The carbon emission accounting module 30 is used to construct carbon emission models for target boiler pipe fittings of different quality grades respectively, so as to calculate and obtain the carbon emissions of target boiler pipe fittings of different quality grades. The construction of the carbon emission model is based on the carbon emission characteristics of boiler pipe fittings in the whole life cycle, and the carbon emissions are calculated according to the carbon emission factor method.

[0145] The environmental protection grade judgment module 40 is used to judge the environmental protection grade of the target boiler pipe fittings according to the carbon emissions. The environmental protection grade judgment is based on the environmental protection benefit standard.

[0146] The comprehensive evaluation module 50 is used to conduct a comprehensive evaluation according to the quality grade and environmental protection grade of the target boiler pipe fittings to obtain the final evaluation result. The comprehensive evaluation is based on the fuzzy evaluation algorithm.

[0147] The present invention also proposes a computer storage medium, on which one or more programs are stored. When the program is executed by a processor, the low-carbon remanufacturing evaluation method of the above-mentioned boiler pipe fittings is realized.

[0148] The present invention also proposes a computer device, including a memory and a processor. The memory is used to store a computer program, and the processor is used to execute the computer program stored on the memory to realize the low-carbon remanufacturing evaluation method of the above-mentioned boiler pipe fittings.

[0149] Those skilled in the art can understand that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus or device and execute the instructions), or used in combination with these instruction execution systems, apparatus or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus or device.

[0150] More specific examples (a non-exhaustive list) of computer-readable media include the following: electrical connections (electronic devices) having one or more wirings, portable computer diskettes (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber devices, and portable compact disc read-only memory (CDROM). Additionally, the computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0151] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0152] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0153] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A method for evaluating low-carbon remanufacturing of boiler pipes, characterized in that: include: According to the modal analysis algorithm, a plurality of natural frequencies of the target boiler pipe are obtained, each of the natural frequencies having a unique corresponding fatigue stage; Performing a quality grade judgment on the target boiler pipe according to the natural frequency, wherein the quality grade judgment is based on the degree of damage of the target boiler pipe; The step of judging the quality grade of the target boiler pipe according to the natural frequency specifically includes: Compare the natural frequencies at different fatigue stages to obtain the natural frequency changes; Calculating the damage state of the target boiler tube according to the change of the natural frequency to determine the damage degree of the target boiler tube; Performing a quality grade judgment on the target boiler pipe according to the damage degree, wherein the quality grade judgment is based on an offset value of a natural frequency; Carbon emission models are constructed for target boiler pipes of different quality grades to calculate the carbon emissions of target boiler pipes of different quality grades. The carbon emission model is constructed based on the carbon emission characteristics of boiler pipes throughout their life cycle, and the carbon emissions are calculated according to the carbon emission factor method; The step of constructing carbon emission models for target boiler pipes of different quality grades respectively to calculate and obtain carbon emissions of target boiler pipes of different quality grades specifically includes: Obtain the carbon emission characteristics of the target boiler pipes throughout their entire life cycle, including the raw material production stage, manufacturing stage, transportation stage, use stage, recycling stage, and remanufacturing stage; Constructing a carbon emission model according to the carbon emission characteristics, wherein constructing the carbon emission model includes determining the system boundary of the boiler pipe manufacturing process and determining the carbon emission sources at each stage of the entire life cycle, wherein the carbon emission sources include material carbon emission, energy carbon emission and waste treatment carbon emission; The carbon emission model determines the impact weight of each stage in the whole life cycle according to the quality grade of the target boiler pipe fittings, and calculates the carbon emissions of each stage based on the carbon emission factor method. The energy consumption value of the use stage is corrected based on the stiffness attenuation; The carbon emission model specifically includes: A carbon emission model is constructed based on the entire life cycle. The specific structure of the carbon emission model is as follows: ， in, represents the total carbon emissions over the entire life cycle, Represents the carbon emissions during the raw material production stage, represents the carbon emissions during the manufacturing phase, represents the carbon emissions during the transportation phase, Indicates the carbon emissions during the use phase, represents the carbon emissions during the recycling phase, Indicates the carbon emissions during the remanufacturing phase; The specific calculation formula for carbon emissions in the raw material production stage is as follows: ， in, Indicates the weight of the target boiler pipe, represents the carbon emission factor for virgin steel, Indicates the utilization rate of recycled materials, represents the carbon emission factor of recycled steel; The specific calculation formula for carbon emissions in the manufacturing stage is as follows: ， in, Represents the processing energy consumption, represents the carbon emission factor of electricity, represents a damage correction factor, wherein the damage correction factor is based on the quality grade; The specific calculation formula for carbon emissions during the use phase is as follows: ， in, Indicates the boiler thermal power, Indicates the service life of the target boiler pipe fittings. represents the thermal efficiency, which is corrected based on the stiffness attenuation of the crack and is used to adjust the thermal efficiency decreased by the crack. represents the fuel carbon emission factor; The specific calculation formulas for the carbon emissions in the recycling stage and the carbon emissions in the remanufacturing stage are as follows: ， in, represents the disassembly carbon emission factor, represents the remanufacturing carbon emission factor, Indicates the remanufacturing ratio; According to the carbon emission, the environmental protection grade of the target boiler pipe is judged, and the environmental protection grade is judged based on the environmental protection benefit standard; A comprehensive evaluation is performed according to the quality grade and environmental protection grade of the target boiler pipe fittings to obtain a final evaluation result, wherein the comprehensive evaluation is based on a fuzzy evaluation algorithm.

2. The boiler tube low-carbon remanufacturing evaluation method according to claim 1 is characterized in that: The step of obtaining multiple natural frequencies of the target boiler pipe according to the modal analysis algorithm specifically includes: Constructing a finite element model of a target boiler pipe, wherein the finite element model includes crack characteristics of the target boiler pipe, wherein the crack characteristics include crack width, depth, position, and stiffness attenuation; A modal analysis is performed on the finite element model of the target boiler pipe, and dynamic response parameters at different fatigue stages are measured to obtain multiple natural frequencies of the target boiler pipe, wherein the modal analysis acts on the fatigue loading process.

3. The boiler tube low-carbon remanufacturing evaluation method according to claim 1 is characterized in that: The step of determining the environmental protection level of the target boiler pipe according to the carbon emissions specifically includes: Analyze the carbon emission characteristics of each stage in the life cycle of the target boiler pipes and calculate the carbon emissions at each stage; According to the carbon emissions of each stage of the target boiler pipe fittings, the carbon emissions of new manufacturing and remanufacturing of the target boiler pipe fittings are calculated separately; Compare the carbon emissions of new product manufacturing and remanufacturing of the target boiler pipe fittings, and determine the carbon emission contribution values ​​of all processes and carbon emission sources in each stage of new product manufacturing and remanufacturing; The carbon emission contribution value is environmentally graded according to the environmental benefit standard to obtain the environmental grade of the target boiler pipe fittings.

4. The boiler tube low-carbon remanufacturing evaluation method according to claim 1 is characterized in that: The step of performing a comprehensive evaluation based on the quality grade and environmental protection grade of the target boiler pipe fittings to obtain the final evaluation result specifically includes: The quality grade and environmental protection grade of the target boiler pipes are refined into secondary indicators, and the secondary indicators of the quality grade are refined into tensile strength, surface crack depth and remaining service life, and the secondary indicators of the environmental protection grade are refined into recycled material utilization rate, remanufacturing carbon emissions and pollutant emission compliance rate; Determine the weight value of each secondary indicator according to the hierarchical analysis method; Performing fuzzy processing on each secondary indicator to map the secondary indicator to an evaluation level, and respectively calculating the quality comprehensive score and environmental comprehensive score of the secondary indicator; The final evaluation result is obtained based on the comprehensive quality score and the comprehensive environmental protection score.

5. A boiler pipe low-carbon remanufacturing evaluation system, characterized in that: include: A modal analysis module, used for obtaining a plurality of natural frequencies of a target boiler pipe according to a modal analysis algorithm, each of the natural frequencies having a unique corresponding fatigue stage; A quality grade judgment module, used for judging the quality grade of the target boiler pipe according to the natural frequency, wherein the quality grade judgment is based on the degree of damage of the target boiler pipe; The step of judging the quality grade of the target boiler pipe according to the natural frequency specifically includes: Compare the natural frequencies at different fatigue stages to obtain the natural frequency changes; Calculating the damage state of the target boiler tube according to the change of the natural frequency to determine the damage degree of the target boiler tube; Performing a quality grade judgment on the target boiler pipe according to the damage degree, wherein the quality grade judgment is based on an offset value of a natural frequency; A carbon emission accounting module is used to construct carbon emission models for target boiler pipes of different quality grades to calculate the carbon emissions of target boiler pipes of different quality grades. The carbon emission model is constructed based on the carbon emission characteristics of boiler pipes throughout their life cycle, and the carbon emissions are calculated according to the carbon emission factor method; The step of constructing carbon emission models for target boiler pipes of different quality grades respectively to calculate and obtain carbon emissions of target boiler pipes of different quality grades specifically includes: Obtain the carbon emission characteristics of the target boiler pipes throughout their entire life cycle, including the raw material production stage, manufacturing stage, transportation stage, use stage, recycling stage, and remanufacturing stage; Constructing a carbon emission model according to the carbon emission characteristics, wherein constructing the carbon emission model includes determining the system boundary of the boiler pipe manufacturing process and determining the carbon emission sources at each stage of the entire life cycle, wherein the carbon emission sources include material carbon emission, energy carbon emission and waste treatment carbon emission; The carbon emission model determines the impact weight of each stage in the whole life cycle according to the quality grade of the target boiler pipe fittings, and calculates the carbon emissions of each stage based on the carbon emission factor method. The energy consumption value of the use stage is corrected based on the stiffness attenuation; The carbon emission model specifically includes: A carbon emission model is constructed based on the entire life cycle. The specific structure of the carbon emission model is as follows: ， in, represents the total carbon emissions over the entire life cycle, Represents the carbon emissions during the raw material production stage, represents the carbon emissions during the manufacturing phase, represents the carbon emissions during the transportation phase, Indicates the carbon emissions during the use phase, represents the carbon emissions during the recycling phase, Indicates the carbon emissions during the remanufacturing phase; The specific calculation formula for carbon emissions in the raw material production stage is as follows: ， in, Indicates the weight of the target boiler pipe, represents the carbon emission factor for virgin steel, Indicates the utilization rate of recycled materials, represents the carbon emission factor of recycled steel; The specific calculation formula for carbon emissions in the manufacturing stage is as follows: ， in, Represents the processing energy consumption, represents the carbon emission factor of electricity, represents a damage correction factor, wherein the damage correction factor is based on the quality grade; The specific calculation formula for carbon emissions during the use phase is as follows: ， in, Indicates the boiler thermal power, Indicates the service life of the target boiler pipe fittings. represents the thermal efficiency, which is corrected based on the stiffness attenuation of the crack and is used to adjust the thermal efficiency decreased by the crack. represents the fuel carbon emission factor; The specific calculation formulas for the carbon emissions in the recycling stage and the carbon emissions in the remanufacturing stage are as follows: ， in, represents the disassembly carbon emission factor, represents the remanufacturing carbon emission factor, Indicates the remanufacturing ratio; An environmental protection grade judgment module, used to judge the environmental protection grade of the target boiler pipe according to the carbon emission, and the environmental protection grade judgment is based on the environmental protection benefit standard; The comprehensive evaluation module is used to conduct a comprehensive evaluation based on the quality grade and environmental protection grade of the target boiler pipe fittings to obtain a final evaluation result, wherein the comprehensive evaluation is based on a fuzzy evaluation algorithm.

6. A storage medium, characterized in that: The storage medium stores one or more programs, which, when executed by a processor, implement the boiler tube low-carbon remanufacturing assessment method according to any one of claims 1 to 4.

7. A computer device, characterized in that: The computer device comprises a memory and a processor, wherein: The memory is used to store computer programs; When the processor is used to execute the computer program stored in the memory, the boiler pipe low-carbon remanufacturing evaluation method according to any one of claims 1 to 4 is implemented.

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