Boiler pipe fitting low-carbon remanufacturing evaluation method and system

Abstract

The invention relates to the field of data modeling evaluation analysis, and provides a low-carbon remanufacturing evaluation method and system for a boiler pipe fitting, the inherent frequency of the boiler pipe fitting is obtained through a modal analysis algorithm, the influence of cracks on the inherent frequency is determined, the accurate judgment of the damage degree of the boiler pipe fitting is realized, and the reliability of the boiler pipe fitting is improved. Therefore, the quality grade of the boiler pipe fitting is accurately judged, the cost of manual damage judgment is saved, the evaluation efficiency is improved, the carbon emission of the whole life cycle of the boiler pipe fitting is checked by designing a carbon emission model, the influence of a complex emission source is avoided, the checking efficiency is improved, meanwhile, energy consumption correction is conducted according to the quality grade, and the accuracy of energy consumption correction is improved. The method further improves the accuracy of accounting, achieves the accurate judgment of the environmental protection grade of the boiler pipe fitting, finally carries out the comprehensive evaluation through combining the quality grade and the environmental protection grade of the boiler pipe fitting, enables the decision of the evaluation result to better meet the actual condition, and improves the accuracy and comprehensiveness of the low-carbon remanufacturing evaluation method of the boiler pipe fitting.

Description

Technical Field

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

[0002] In the prior art, the recycling of boiler tubes often adopts the method of manual evaluation to determine whether the status of the boiler tubes is to be remanufactured or scrapped. 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 recycled boiler tubes. At the same time, the efficiency of manual evaluation is low, and it is difficult to meet the growing recycling demand.

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

[0004] Based on this, the present invention proposes a low-carbon remanufacturing evaluation method and system for boiler pipe fittings, which obtains the natural frequency of boiler pipe fittings through a modal analysis algorithm, determines the influence of cracks on the natural frequency, and realizes accurate judgment of the degree of damage of boiler pipe fittings, thereby accurately judging the quality grade of boiler pipe fittings, saving the cost of manual judgment of damage, and improving evaluation efficiency. Then, by designing a carbon emission model, the carbon emissions of boiler pipe fittings throughout their life cycle are calculated, avoiding the influence of complex emission sources and improving calculation efficiency. At the same time, energy consumption is corrected according to the quality grade, and the accuracy of the calculation is further improved, so as to realize accurate judgment of the environmental protection grade of boiler pipe fittings. Finally, a comprehensive evaluation is performed based on the quality grade and environmental protection grade of 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 low-carbon remanufacturing evaluation method for boiler pipe fittings.

[0005] The present invention proposes a low-carbon remanufacturing evaluation method for boiler pipe fittings, comprising: 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; 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; 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.

[0006] In summary, according to the above-mentioned low-carbon remanufacturing evaluation method for boiler pipe fittings, the natural frequency of boiler pipe fittings is obtained through the modal analysis algorithm, the influence of cracks on the natural frequency is determined, and the accurate judgment of the degree of damage of boiler pipe fittings is achieved, thereby accurately judging the quality grade of boiler pipe fittings, saving the cost of manual judgment of damage, and improving the evaluation efficiency. Then, by designing a carbon emission model, the carbon emissions of boiler pipe fittings throughout their life cycle are calculated, avoiding the influence of complex emission sources and improving the calculation efficiency. At the same time, energy consumption correction is performed according to the quality grade, and the accuracy of the calculation is further improved, so as to achieve accurate judgment of the environmental protection grade of boiler pipe fittings. Finally, a comprehensive evaluation is performed based on the quality grade and environmental protection grade of 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 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, each of which has a unique corresponding fatigue stage. The quality grade of the target boiler pipe fittings is judged according to the natural frequencies. The quality grade judgment is based on the damage degree of the target boiler pipe fittings, thereby achieving 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. Carbon emission models are constructed for target boiler pipe fittings of different quality grades to calculate the carbon emissions of target boiler pipe fittings of different quality grades. The carbon emission model is constructed based on the carbon emission model of boiler pipe fittings over the entire life cycle. Emission characteristics, the carbon emissions are calculated according to the carbon emission factor method, which avoids the influence of complex emission sources and improves the calculation efficiency. At the same time, energy consumption correction is performed according to the quality grade, which further improves the accuracy of the calculation, so as to achieve accurate judgment of the environmental protection grade of boiler pipe fittings. The environmental protection grade of the target boiler pipe fittings is judged according to the carbon emissions. The environmental protection grade judgment is 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 the final evaluation result. The comprehensive evaluation is based on the fuzzy evaluation algorithm, 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 low-carbon remanufacturing evaluation method of boiler pipe fittings.

[0007] Furthermore, 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.

[0008] Furthermore, 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; The quality grade of the target boiler pipe is judged according to the damage degree, and the quality grade judgment is based on the offset value of the natural frequency.

[0009] Furthermore, the step of constructing carbon emission models for target boiler pipes of different quality grades respectively to calculate and obtain the 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 entire 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 stiffness attenuation.

[0010] Furthermore, 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.

[0011] Furthermore, the step of judging the environmental protection level of the target boiler pipe according to the carbon emission 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.

[0012] Furthermore, 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.

[0013] The present invention proposes a boiler pipe low-carbon remanufacturing evaluation system, comprising: 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; 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; 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.

[0014] The present invention also provides a storage medium, wherein the storage medium stores one or more programs, and when the programs are executed by a processor, the low-carbon remanufacturing evaluation method for boiler pipes as described above is implemented.

[0015] The present invention also provides a computer device, the computer device comprising 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 above-mentioned boiler pipe low-carbon remanufacturing evaluation method is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart of a boiler tube low-carbon remanufacturing evaluation method proposed in the first embodiment of the present invention; Figure 2 A schematic diagram of the structure of a boiler tube low-carbon remanufacturing evaluation system proposed in the second embodiment of the present invention; Figure 3 A finite element model of a boiler tube low-carbon remanufacturing evaluation method according to a first embodiment of the present invention; Figure 4 This is a diagram showing changes in the natural frequency of the first fatigue stage of the boiler tube low-carbon remanufacturing evaluation method proposed in the first embodiment; Figure 5 This is a natural frequency variation diagram of the second fatigue stage of the boiler tube low-carbon remanufacturing evaluation method proposed in the first embodiment; Figure 6 A diagram showing changes in the natural frequency of the third fatigue stage of the boiler tube low-carbon remanufacturing evaluation method proposed in the first embodiment; Figure 7 This is a graph showing the change in natural frequency of the fourth fatigue stage of the boiler tube low-carbon remanufacturing evaluation method proposed in the first embodiment; Figure 8 A graph showing changes in the natural frequency of the fifth fatigue stage of the boiler tube low-carbon remanufacturing evaluation method proposed in the first embodiment; Fig. 9 This is a graph showing the change in natural frequency of the sixth fatigue stage of the boiler tube low-carbon remanufacturing evaluation method proposed in the first embodiment.

[0017] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are provided 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, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention 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.

[0021] See also Figure 1 , which is a flow chart of a boiler tube low-carbon remanufacturing evaluation method according to a first embodiment of the present invention, the boiler tube low-carbon remanufacturing evaluation method comprises steps S01 to S05, wherein: Step S01: obtaining multiple natural frequencies of a target boiler pipe according to a modal analysis algorithm; It should be noted that in this embodiment, each of the natural frequencies has a unique corresponding fatigue stage, and a finite element model of a target boiler pipe is constructed, wherein the finite element model includes crack characteristics of the target boiler pipe, and the crack characteristics include crack width, depth, position and stiffness attenuation; The finite element model of the boiler pipe in this embodiment can be found in Figure 3 ; Figure 3 The x, y, and z in the equation represent the positive directions of the horizontal axis, the vertical axis, and the vertical axis, respectively. a represents the crack depth of the boiler tube, and b, h, L, l They represent the width, height, length and crack distance of boiler tubes respectively; Performing modal analysis on the finite element model of the target boiler pipe, measuring dynamic response parameters at different fatigue stages to obtain multiple natural frequencies of the target boiler pipe, wherein the modal analysis acts on the fatigue loading process; In this embodiment, the natural frequency states of the boiler tubes at different fatigue stages are shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 ; Determine the effects of crack width, depth, location and stiffness reduction on natural frequencies including: The calculation of the structural natural frequency is derived from the undamped free vibration equation: , in,[ 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 crack width, depth, position and stiffness attenuation on the natural frequency needs to be calculated by modifying the stiffness matrix [ K ] is quantified, the crack causes the local stiffness to decrease, and the modified stiffness matrix It can be expressed as: , Among them, Δ K is the stiffness attenuation caused by the crack. After substituting it into the characteristic equation, the modified natural frequency formula is: , in, represents the corrected angular frequency; Since the crack width and depth are usually related to the local stiffness attenuation Δ K There is a positive correlation, and the effective crack length can be described by the following formula: , in, d is the cross-section width, h is the section height, α is the empirical coefficient, represents the effective crack length, It represents the characteristic length of the structure, which represents the total length of the structure or the load acting length.

[0022] Step S02: judging the quality grade of the target boiler pipe according to the natural frequency; It should be noted that the quality grade judgment described in this embodiment is based on the damage degree of the target boiler pipe fittings, and the natural frequencies at different fatigue stages are compared 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; The specific formula for the change of natural frequency is as follows: , in, K represents the stiffness, Δ K Crack width w ,depth d and position determine the stiffness attenuation, mass M Usually unaffected by cracks unless they result in loss of quality; The specific calculation formula of the natural frequency offset value is as follows: , in, represents the natural frequency offset value, represents the theoretically calculated frequency offset, Indicates the actual measured frequency offset value, and makes a graded judgment based on the range of the inherent frequency offset value. When ≤5%, the quality grade is excellent, 5%< ≤10% quality grade is good, >10% quality grade is poor.

[0023] Step S03: constructing carbon emission models for target boiler pipes of different quality grades respectively, so as to calculate and obtain the carbon emissions of target boiler pipes of different quality grades; It should be noted that the carbon emission model described in this embodiment is constructed based on the carbon emission characteristics of boiler pipes throughout the entire life cycle. The carbon emissions are calculated according to the carbon emission factor method to obtain the carbon emission characteristics of the target boiler pipes throughout the entire life cycle. The entire life cycle includes 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.

[0024] Step S04: judging the environmental protection level of the target boiler pipe according to the carbon emission; It should be noted that the environmental protection level judgment described in this embodiment is based on the environmental protection benefit standard, and the carbon emission characteristics of each stage in the entire life cycle of the target boiler pipe are analyzed to calculate and obtain the carbon emission amount of 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; Environmental protection grading is performed on the carbon emission contribution value according to the environmental protection benefit standard to obtain the environmental protection grade of the target boiler pipe fittings; In this embodiment, the environmental protection level is divided into the following three levels: National environmental protection benchmark (Grade A): The proportion of recycled steel raw materials is ≥80%, and the electric furnace short process is preferred. The carbon emission intensity of original materials is ≤0.7 tons of carbon dioxide / ton; the remanufacturing rate is ≥90%, and the repair process adopts low-temperature cold spraying or laser cladding technology, and the energy consumption is less than 30% of the original manufacturing; the particulate matter (PM) emission concentration of the remanufacturing process is ≤10mg / m³, and the nitrogen oxides (NOx) are ≤50mg / m³, which meets the ultra-low emission requirements of the "Technical Regulations for Energy Saving and Environmental Protection of Boilers" (TSG 91); the emission of toxic substances such as dioxins meets the exhaust gas standards; equipped with an "intelligent management and control integrated platform" to achieve full life cycle carbon footprint tracking and real-time energy efficiency optimization; Regional or provincial environmental protection leading (B level): Recycled steel raw materials account for 50%~80%, carbon emission intensity ≤1.2 tons of carbon dioxide / ton; remanufacturing rate ≥70%, repair process mainly based on traditional cladding, energy consumption is 50% of original manufacturing; particulate matter emission concentration ≤30mg / m³, nitrogen oxides ≤100mg / m³, meeting provincial environmental protection performance grading standards; adopting regionally promoted energy-saving technologies (such as flue gas waste heat recovery, gas boiler condensation transformation), thermal efficiency increased by ≥5% compared with the benchmark; Poor environmental protection (Grade C): The proportion of recycled steel raw materials is less than 50%, relying on the original blast furnace steelmaking process, and the carbon emission intensity is ≥2.0 tons of carbon dioxide / ton; the remanufacturing rate is less than 50%, the direct scrap ratio is high, and the carbon emissions during the dismantling process are not standardized; the particulate matter emission concentration is greater than 50mg / m³, and the nitrogen oxides are greater than 150mg / m³, which exceed the limit values ​​of the "Industrial Boiler Energy Efficiency Limit Values ​​and Energy Efficiency Grades" (GB24500); there is a lack of 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.

[0025] Step S05: Perform a comprehensive evaluation based on the quality grade and environmental protection grade of the target boiler pipe fittings to obtain a final evaluation result; It should be noted that the comprehensive evaluation described in this embodiment is based on a fuzzy evaluation algorithm, and the quality grade and environmental protection grade of the target boiler pipe 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; The evaluation index system in this embodiment is as follows in Table 1: Table 1 Evaluation index system 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 according to the comprehensive quality score and the comprehensive environmental protection score; The specific formula for calculating the comprehensive quality score and comprehensive environmental protection score of the secondary indicators is as follows: , in, R is the membership matrix, i and j Represent the ordinal numbers of the secondary indicators of quality and environmental protection, is the weight value of the secondary indicator, the comprehensive quality score and environmental protection comprehensive score When both are greater than or equal to 0.8, the quality level is excellent, the environmental protection level is A, and the decision-making plan is to use it directly after remanufacturing; the comprehensive quality score and environmental 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, and the decision-making plan is local repair plus economic verification; the comprehensive quality score and environmental comprehensive score When both are less than 0.6, the quality grade is poor, the environmental protection grade is C, and the decision-making plan is compulsory scrapping and environmental protection treatment.

[0026] In summary, according to the above-mentioned low-carbon remanufacturing evaluation method for boiler pipe fittings, the natural frequency of boiler pipe fittings is obtained through the modal analysis algorithm, the influence of cracks on the natural frequency is determined, and the accurate judgment of the degree of damage of boiler pipe fittings is achieved, thereby accurately judging the quality grade of boiler pipe fittings, saving the cost of manual judgment of damage, and improving the evaluation efficiency. Then, by designing a carbon emission model, the carbon emissions of boiler pipe fittings throughout their life cycle are calculated, avoiding the influence of complex emission sources and improving the calculation efficiency. At the same time, energy consumption correction is performed according to the quality grade, and the accuracy of the calculation is further improved, so as to achieve accurate judgment of the environmental protection grade of boiler pipe fittings. Finally, a comprehensive evaluation is performed based on the quality grade and environmental protection grade of 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 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, each of which has a unique corresponding fatigue stage. The quality grade of the target boiler pipe fittings is judged according to the natural frequencies. The quality grade judgment is based on the damage degree of the target boiler pipe fittings, thereby achieving 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. Carbon emission models are constructed for target boiler pipe fittings of different quality grades to calculate the carbon emissions of target boiler pipe fittings of different quality grades. The carbon emission model is constructed based on the carbon emission model of boiler pipe fittings over the entire life cycle. Emission characteristics, the carbon emissions are calculated according to the carbon emission factor method, which avoids the influence of complex emission sources and improves the calculation efficiency. At the same time, energy consumption correction is performed according to the quality grade, which further improves the accuracy of the calculation, so as to achieve accurate judgment of the environmental protection grade of boiler pipe fittings. The environmental protection grade of the target boiler pipe fittings is judged according to the carbon emissions. The environmental protection grade judgment is 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 the final evaluation result. The comprehensive evaluation is based on the fuzzy evaluation algorithm, 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 low-carbon remanufacturing evaluation method of boiler pipe fittings.

[0027] See also Figure 2 , which is a schematic diagram of the structure of a boiler pipe low-carbon remanufacturing evaluation system proposed in the third embodiment of the present invention, and the system includes: The modal analysis module 10 is used to obtain multiple natural frequencies of the target boiler pipe according to the modal analysis algorithm, each of which has a unique corresponding fatigue stage; A quality grade judgment module 20, configured to judge 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; A carbon emission calculation module 30 is used to construct carbon emission models for target boiler pipes of different quality grades respectively, so as to calculate and obtain the carbon emission 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 emission is calculated according to the carbon emission factor method; An environmental protection grade judgment module 40 is 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 50 is used to perform a comprehensive evaluation based on the quality grade and environmental protection grade of the target boiler pipe to obtain a final evaluation result, wherein the comprehensive evaluation is based on a fuzzy evaluation algorithm.

[0028] The present invention also provides a computer storage medium on which one or more programs are stored, and when the programs are executed by a processor, the above-mentioned boiler pipe low-carbon remanufacturing evaluation method is implemented.

[0029] The present invention also proposes a computer device, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to implement the above-mentioned boiler pipe low-carbon remanufacturing assessment method.

[0030] Those skilled in the art will appreciate that the logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, "computer-readable medium" may be any device that can contain storage, communication, propagation or transmission of a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0031] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0032] 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-mentioned 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, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does 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.

[0034] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached 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; 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; 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 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; The quality grade of the target boiler pipe is judged according to the damage degree, and the quality grade judgment is based on the offset value of the natural frequency.

4. The boiler tube low-carbon remanufacturing evaluation method according to claim 1 is characterized in that: The step of constructing carbon emission models for target boiler pipes of different quality grades respectively to calculate and obtain the 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 entire 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 stiffness attenuation.

5. The boiler tube low-carbon remanufacturing evaluation method according to claim 4 is characterized in that: 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.

6. The boiler tube low-carbon remanufacturing assessment 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.

7. The boiler tube low-carbon remanufacturing assessment 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.

8. 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; 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; 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.

9. 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 7.

10. 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 7 is implemented.

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