Intelligent evaluation method and system for carbon emissions of aluminum alloy space structure in whole life cycle

Abstract

This application relates to the field of carbon emission assessment technology, and discloses an intelligent method and system for assessing the carbon emissions of aluminum alloy space structures throughout their entire life cycle. The method includes: obtaining a dismantling parameter by the ratio of the number of times the alloy grade is completely separated during dismantling operations based on the connection method of each node to the total number of dismantling verifications; obtaining the scrap aluminum grade preservation and recycling rate through linear interpolation; obtaining the end-stage carbon credit by weighting the carbon emission intensity difference between the grade preservation and downgrading recycling paths; obtaining the front-end carbon emission by weighting the carbon emissions of each stage using the cross-sectional magnification factor as a weight; and subtracting the two to obtain the net carbon emission assessment value for the entire life cycle. This application improves the accuracy of the net carbon emission assessment value for the entire life cycle of aluminum alloy space structures.

Description

Technical Field

[0001] This application relates to the field of carbon emission assessment technology, and in particular to an intelligent method and system for assessing the carbon emissions of aluminum alloy space structures throughout their entire life cycle. Background Technology

[0002] Aluminum alloy space structures are widely used in large-span buildings, transportation hubs, and public facilities due to their advantages such as lightweight, high strength, corrosion resistance, and recyclability. Conducting a full life-cycle carbon emission assessment (LCA) of aluminum alloy space structures has become a core means of measuring their environmental friendliness. Existing LCA methods are based on the ISO 14040 series of standards, calculating carbon emissions item by item according to each stage of raw material production, component processing, transportation, construction, and dismantling and recycling. The carbon credits at the end stage are calculated statically based on a fixed proportion of recycled aluminum. The carbon emission factors used are taken from national or industry-wide averages, and the assessment process is completed manually using general LCA software or spreadsheets.

[0003] However, the aforementioned existing technologies have significant drawbacks when applied to the specific assessment object of aluminum alloy space structures. The end-of-life carbon credits of aluminum alloys play a crucial role in the life-cycle carbon emission accounting. The carbon emission intensity of recycled aluminum is only 5% of that of primary aluminum. Whether end-of-life scrap aluminum can be recycled while maintaining its grade directly determines the magnitude of the carbon credits. Furthermore, whether scrap aluminum can be completely separated according to alloy grade and recycled while maintaining its grade fundamentally depends on the separability of the joint connections during structural dismantling. Existing assessment methods treat joint selection as a purely mechanical design variable, never establishing a quantitative mapping relationship between joint connection methods and the grade-maintaining recycling rate of scrap aluminum. End-of-life carbon credits are always statically substituted with fixed assumptions, leading to a systematic deviation between the assessment results and the actual life-cycle carbon emissions of aluminum alloy space structures. Summary of the Invention

[0004] This application provides a method and system for intelligent assessment of carbon emissions throughout the entire life cycle of aluminum alloy space structures. It solves the problems in the prior art of lacking a quantitative mapping relationship between node connection methods and waste aluminum recycling rate, and the inability to accurately include end-of-life carbon credits in the full life cycle carbon emission accounting, thereby improving the accuracy of the net carbon emission assessment value of aluminum alloy space structures throughout their entire life cycle.

[0005] Firstly, this application provides a method for intelligent assessment of carbon emissions throughout the entire life cycle of aluminum alloy space structures, the method comprising: Step S1: Compare the number of times the alloy grade can be completely separated during the dismantling operation of each node connection method in the aluminum alloy space structure with the total number of dismantling verifications to obtain the dismantling performance parameter. Perform linear interpolation calculation with the dismantling performance parameter and the upper and lower limits of the grade preservation recovery rate to obtain the grade preservation recovery rate of waste aluminum corresponding to each node connection method. Step S2: The difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum are used as the unit carbon credit base for grade preservation and downgraded recycling, respectively. The carbon emission reduction contribution of grade preservation and downgraded recycling is numerically calculated and summed with the grade preservation rate of scrap aluminum and the total amount of aluminum used as weights to obtain the end carbon credit. Step S3: Using the cross-sectional magnification factor corresponding to the node connection method as the weight, the carbon emission values ​​of each stage of raw material production, component processing, transportation and construction are weighted and summed sequentially to obtain the front-end carbon emission. Step S4: Divide the front-end carbon emissions with the end-end carbon credits to obtain the net carbon emissions assessment value for the entire life cycle.

[0006] Secondly, this application provides an intelligent assessment system for the full life cycle carbon emissions of aluminum alloy space structures, the intelligent assessment system for the full life cycle carbon emissions of aluminum alloy space structures comprising: The calculation module is used to compare the number of times that the alloy grade can be completely separated during the dismantling operation of each node connection method in the aluminum alloy space structure with the total number of dismantling verifications to obtain the dismantling parameters. The dismantling parameters are then used to perform linear interpolation calculations with the upper and lower limits of the grade preservation and recovery rate to obtain the grade preservation and recovery rate of scrap aluminum corresponding to each node connection method. The summation module is used to take the difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum as the unit carbon credit base for grade preservation and downgraded recycling, respectively. The module uses the grade preservation recycling rate of waste aluminum and the total amount of aluminum used as weights to calculate the carbon emission reduction contribution of grade preservation and downgraded recycling paths, and then sums them to obtain the end carbon credit. The weighting module is used to sum the carbon emission values ​​of each stage of raw material production, component processing, transportation and construction in sequence, with the cross-sectional magnification factor corresponding to the node connection method as the weight, to obtain the front-end carbon emission. An assessment module is used to calculate the difference between the front-end carbon emissions and the end-end carbon credit to obtain a net carbon emission assessment value for the entire life cycle.

[0007] Thirdly, a smart assessment device for the full life cycle carbon emissions of aluminum alloy space structures is provided, comprising: a memory and at least one processor, wherein the memory stores instructions; the at least one processor invokes the instructions in the memory to cause the smart assessment device for the full life cycle carbon emissions of aluminum alloy space structures to execute the aforementioned smart assessment method for the full life cycle carbon emissions of aluminum alloy space structures.

[0008] Fourthly, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium, which, when executed on a computer, cause the computer to execute the above-described intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures.

[0009] The technical solution provided in this application introduces a dismantling parameter intermediate quantity into the full life cycle carbon emission assessment framework, establishing for the first time a quantitative mapping relationship between node connection methods and the grade preservation and recycling rate of scrap aluminum. It transforms the statistical probability of complete separation of scrap aluminum alloy grades during the dismantling stage of the aluminum alloy spatial structure into a quantitative parameter that can directly participate in carbon emission numerical calculations, thus bridging the long-standing computational gap between node connection methods and end-of-life carbon credits. Based on this, using the difference in carbon emission intensity under the two recycling paths of grade preservation and downgraded recycling as the unit carbon credit base, and using the grade preservation and recycling rate of scrap aluminum and its compensation value as weights, the carbon emission reduction contributions of the two paths are numerically calculated and summed to obtain the end-of-life carbon credits that precisely correspond to specific node types. This overcomes the systematic assessment bias caused by the static substitution of fixed assumptions into the end-of-life carbon credits in existing technologies, ensuring that the calculation results of the end-of-life carbon credits truly reflect the actual carbon emission reduction potential of scrap aluminum recycling under specific node configurations of the aluminum alloy spatial structure.

[0010] By incorporating the cross-sectional magnification factor corresponding to the node connection method into the weighted summation calculation of front-end carbon emissions, the influence of node stiffness characteristics on component cross-sectional requirements is quantitatively transmitted to the carbon emission values ​​at each stage of raw material production, component processing, transportation, and construction. This allows front-end carbon emissions and end-of-life carbon credits to share the driving variable of node connection method within the same assessment framework, thereby quantifying and revealing the previously completely ignored intrinsic coupling relationship between the two. The life-cycle net carbon emission assessment value obtained by subtracting front-end carbon emissions from end-of-life carbon credits simultaneously incorporates the contribution of node dismantlingability to end-of-life carbon credits and the impact of node stiffness on front-end carbon emissions. This enables the assessment results to fully reflect the true cost and benefit of node selection in the life-cycle carbon emissions of aluminum alloy space structures, providing a quantitative assessment basis with inherent logical consistency for low-carbon design decisions of aluminum alloy space structures. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of an embodiment of the intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures in this application. Figure 2This is a schematic diagram illustrating the convergence process of the Bayesian update prediction error for the waste aluminum grade preservation recovery rate in the embodiments of this application; Figure 3 This is a schematic diagram illustrating the distribution of the life-cycle net carbon emission assessment value under the combined influence of the waste aluminum recycling rate and the cross-sectional magnification factor in the embodiments of this application. Detailed Implementation

[0013] This application provides a method and system for intelligent assessment of carbon emissions throughout the entire life cycle of aluminum alloy space structures. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0014] For ease of understanding, the specific process of the embodiments of this application is described below. Please refer to [link / reference]. Figure 1 One embodiment of the intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures in this application includes: Step S1: Compare the number of times the alloy grade can be completely separated during the dismantling operation for each node connection method in the aluminum alloy space structure with the total number of dismantling verifications to obtain the dismantling performance parameter. Use the dismantling performance parameter and the upper and lower limits of the grade preservation and recycling rate to perform linear interpolation calculation to obtain the grade preservation and recycling rate of scrap aluminum corresponding to each node connection method. Specifically, the physical meaning of the disassembly parameter is the statistical probability of achieving complete separation of waste aluminum alloy grades under standard dismantling process conditions for a certain type of node connection method, with a value ranging from zero to one. For welded nodes, the alloy composition of the base material and filler metal diffuses and mixes due to the heat-affected zone of the weld, making it impossible to separate the alloy grades according to their original composition during dismantling; therefore, the corresponding disassembly parameter is close to zero. For bolted ball joints and BOM bolt joints, since there is no heat-affected zone contamination in the connection area and the components can be disassembled piece by piece, the alloy grades of each component remain independent; therefore, the corresponding disassembly parameter is close to 1. The upper limit of the grade preservation and recycling rate of scrap aluminum is taken from the actual measured benchmark of the grade preservation and recycling rate obtained from the actual demolition project of the fully detachable bolted structure. The lower limit is taken from the actual measured benchmark of the grade preservation and recycling rate corresponding to the fully welded structure. The initial value of the grade preservation and recycling rate of scrap aluminum corresponding to each node connection method is obtained by linear interpolation between the upper and lower limits using the disassembly parameter. Then, the initial value of the grade preservation and recycling rate of scrap aluminum is weighted and corrected by the proportion of the number of component connections covered by this type of node to the total number of component connections, so as to obtain the grade preservation and recycling rate of scrap aluminum taking into account the node coverage ratio. This parameter characterizes the mass fraction of scrap aluminum that can enter the grade preservation and recycling process with the original alloy grade after the overall demolition of the aluminum alloy space structure.

[0015] Step S2: The difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum are used as the unit carbon credit base for grade preservation and downgraded recycling, respectively. The carbon emission reduction contribution of grade preservation and downgraded recycling is numerically calculated and summed with the grade preservation rate of scrap aluminum and the total amount of aluminum used as weights to obtain the end carbon credit. Specifically, end-of-life carbon credits represent the total carbon emissions saved by replacing an equivalent amount of primary aluminum production with scrap aluminum from the dismantling of aluminum alloy space structures through two recycling pathways: grade preservation recycling and downgrade recycling. The unit is tons of carbon dioxide. Grade preservation recycling refers to the remelting of scrap aluminum according to the original alloy grade to produce wrought aluminum alloys, with a carbon emission intensity approximately 5% of that of primary aluminum production. Downgrade recycling refers to the use of mixed scrap aluminum only for producing cast aluminum alloys, with a carbon emission intensity higher than grade preservation recycling but lower than that of primary aluminum production. The difference between the carbon emission intensity of primary aluminum and that of recycled aluminum is used as the unit carbon credit base for the grade preservation recycling path. The grade preservation recycling rate and the total aluminum consumption are used as weights to calculate the carbon emission reduction contribution of grade preservation recycling. The difference between the carbon emission intensity of downgraded recycling and that of recycled aluminum is used as the unit carbon credit base for the downgrade recycling path. The supplementary value of the grade preservation recycling rate of scrap aluminum and the total aluminum consumption are used as weights to calculate the carbon emission reduction contribution of downgrade recycling. The sum of the two carbon emission reduction contributions is the end-point carbon credit, which increases monotonically with the increase of the grade preservation recycling rate of scrap aluminum.

[0016] Step S3: Using the cross-sectional magnification factor corresponding to the node connection method as the weight, the carbon emission values ​​of each stage of raw material production, component processing, transportation and construction are weighted and summed sequentially to obtain the front-end carbon emission. Specifically, the section magnification factor is the ratio of the cross-sectional area required by the main load-bearing components of an aluminum alloy spatial structure to meet the same load-bearing capacity, overall stability, and deflection limits when using a certain type of node connection method, to the corresponding cross-sectional area of ​​the welded node. The elastic modulus of aluminum alloy is approximately one-third that of steel. The semi-rigid characteristics of the nodes have a more significant impact on the overall structural stiffness than steel structures. Bolted nodes, due to their lower connection stiffness than welded nodes, require enlarged component cross-sections to compensate for stiffness loss under the same span and load conditions, resulting in a section magnification factor greater than 1. Welded nodes have the highest stiffness, and a section magnification factor of 1 is taken as the benchmark. Using the section magnification factor as the weight, the carbon emission intensity is calculated weighted according to the ratio of primary to recycled aluminum procurement during the raw material production stage; the product of unit energy consumption and grid carbon emission factor during component processing; and the product of transportation distance and transportation carbon emission factor during transportation. The construction benchmark carbon emission is then corrected using a construction carbon emission correction factor. The sum of carbon emissions at each stage is the front-end carbon emission, and this parameter increases monotonically with the increase of the section magnification factor.

[0017] Step S4: Difference between front-end carbon emissions and end-end carbon credits to obtain the net carbon emissions assessment value for the entire life cycle.

[0018] Specifically, the net carbon emission assessment value for the entire life cycle is obtained by subtracting the front-end carbon credit from the end-end carbon credit. The sign of this value directly reflects the carbon emission attributes of the aluminum alloy space structure over its entire life cycle: when the end-end carbon credit is greater than the front-end carbon emissions, the net carbon emission assessment value for the entire life cycle is negative, indicating that the aluminum alloy space structure has a net carbon sink effect over its entire life cycle; when the net carbon emission assessment value for the entire life cycle is positive, it indicates that the front-end carbon emissions exceed the end-end carbon credit, and the structure as a whole is still a net carbon source. Different node connection methods result in different scrap aluminum recycling rates due to their different dismantling parameters, which in turn leads to differences in end-end carbon credits. Simultaneously, different node connection stiffness leads to differences in cross-sectional magnification factors, which in turn leads to differences in front-end carbon emissions. Both factors jointly determine the magnitude of the net carbon emission assessment value for the entire life cycle.

[0019] In one specific embodiment, step S1 compares the number of times the alloy grade of each node connection in the aluminum alloy spatial structure is completely separated during the dismantling operation with the total number of dismantling verifications to obtain dismantling parameters, including: The node connection methods in aluminum alloy spatial structures are classified into four categories: welded nodes, bolted ball nodes, BOM bolt nodes, and cast aluminum integral nodes. For each of the four types of node connection methods, no less than 30 sets of dismantling verification tests were conducted under standard dismantling process conditions. The number of times that the alloy grade was completely separated in the dismantling verification tests for each type of node connection method was counted. The disassembly parameters corresponding to the connection methods of each node are obtained by comparing the number of times the alloy grade was completely separated with the total number of disassembly verifications and taking the arithmetic mean.

[0020] Specifically, standard dismantling process conditions refer to the corresponding industrial dismantling methods used for different node connection methods: welded nodes are cut along the weld seam using gas cutting or mechanical cutting; bolted ball joints and BOM bolt joints are separated from the components by disassembling the bolts one by one using wrenches or pneumatic tools; and cast aluminum integral joints are cut at the joint between the node and the rod using mechanical cutting. The criterion for complete separation of alloy grades is: in the scrap aluminum material cut from the same component after dismantling, if the deviation of the alloy element composition from the original design grade (such as 6061-T6 or 6082-T6) is within the standard tolerance range after spectral detection, and no dissimilar alloy element contamination from adjacent components or node filling materials is detected, then it is determined that the alloy grade has been completely separated. The minimum number of groups for dismantling verification tests is set at no less than 30 groups, based on the basic requirement of the large sample theorem in statistics for the stability of the sample mean. 30 groups of test data can ensure that the arithmetic mean converges to the confidence interval of the true probability, avoiding excessive deviation of dismantling parameters due to insufficient sample size.

[0021] The number of times the alloy grade could be completely separated in all dismantling verification tests for various node connection methods is divided by the total number of dismantling verification tests for that type of node to obtain the separation success rate of each independent test. The arithmetic mean of the separation success rates of all tests is the dismantling parameter corresponding to that node connection method. For welded nodes, due to irreversible diffusion of alloy components in the heat-affected zone, neither gas cutting nor mechanical cutting can completely separate the weld zone from the base material, resulting in weld metal components mixed into the scrap aluminum. The failure rate for determining complete alloy grade separation is extremely high, and the dismantling parameter approaches 0. For BOM bolted nodes, the bolt shank and sleeve form a mechanical locking connection with no metallurgical bonding in the connection area. After dismantling, the alloy composition at the end of the component is completely consistent with the original design grade, resulting in an extremely high success rate for determining complete alloy grade separation, and the dismantling parameter approaches 1. For cast aluminum integral nodes, due to the local insertion area between the node body and the rod, cutting inevitably introduces the cast aluminum alloy components of the node into the scrap aluminum of the rod, resulting in a dismantling parameter between welded nodes and bolted nodes.

[0022] In one specific embodiment, step S1 involves linear interpolation calculation using dismantling parameters and upper and lower limits of the grade preservation recovery rate to obtain an initial value for the grade preservation recovery rate of scrap aluminum, including: The recycling rate of scrap aluminum corresponding to a fully welded structure is used as the lower limit of the recycling rate. The recycling rate of scrap aluminum corresponding to a fully detachable bolt structure is taken as the upper limit of the recycling rate. Linear interpolation calculations are performed based on dismantling parameters, the lower limit of the grade retention recovery rate, and the upper limit of the grade retention recovery rate to obtain the initial value of the grade retention recovery rate of scrap aluminum corresponding to each node connection method.

[0023] Specifically, the lower limit of the graded recovery rate is taken from the measured benchmark of the graded recovery rate of scrap aluminum corresponding to fully welded structures. Its physical meaning is the mass fraction of scrap aluminum from the dismantled aluminum that can enter the wrought aluminum alloy recycling process with its original alloy grade when all nodes of the aluminum alloy spatial structure are welded. This value is determined based on statistical data from the domestic aluminum alloy scrap recycling industry. Due to the severe mixing of scrap aluminum alloy grades in fully welded structures, the current domestic graded recovery rate is approximately 20%, hence the lower limit of the graded recovery rate is set at 0.20. The upper limit of the graded recovery rate is taken from the measured benchmark of the graded recovery rate of scrap aluminum corresponding to fully detachable bolted structures. Its physical meaning is the mass fraction of scrap aluminum from the dismantled aluminum that can enter the wrought aluminum alloy recycling process with its original alloy grade when all nodes are connected with detachable bolts. Because the alloy grades of each component in fully detachable bolted structures remain independent, the purity of the separated scrap aluminum is close to the technical limit. Referring to the statistical data of the European Aluminium Association on the closed-loop recycling of building aluminum alloy scrap, the upper limit of the graded recovery rate is set at 0.95.

[0024] The specific method of linear interpolation is as follows: using the disassembly parameter as the interpolation independent variable, its value in the interval of zero to one is linearly mapped to the lower limit and upper limit of the grade retention recovery rate. That is, the initial value of the grade retention recovery rate of scrap aluminum is equal to the sum of the product of the lower limit, the upper limit, and the difference between the lower and upper limits, and the disassembly parameter. The physical basis of this linear mapping relationship is that the disassembly parameter reflects the probability of achieving complete separation of alloy grades through node connection methods. This probability has a monotonically positive correlation with the mass fraction of grade-retaining usable material in scrap aluminum. The linear assumption is consistent with actual engineering statistical data within the range of the disassembly parameter value. The initial value of the grade retention recovery rate of scrap aluminum is a theoretical prediction value calculated based on the disassembly and separation characteristics of the node type itself. It does not yet take into account the impact of the proportion of connections covered by different types of nodes when different types of nodes are mixed in the same aluminum alloy spatial structure on the overall grade retention recovery rate. This impact is corrected in the subsequent weighted correction step to obtain the final grade retention recovery rate of scrap aluminum that takes into account the node coverage ratio.

[0025] In one specific embodiment, step S1, which obtains the graded recycling rate of scrap aluminum corresponding to the connection method of each node, further includes: The node coverage ratio is obtained by statistically analyzing the proportion of the number of component connections covered by each node connection method to the total number of component connections in the aluminum alloy space structure. The initial value of the scrap aluminum recycling rate is weighted and corrected based on the node coverage ratio to obtain the scrap aluminum recycling rate that takes into account the node coverage ratio. The scrap aluminum recycling rate is then used as the calculation input for end-of-pipe carbon credits.

[0026] Specifically, the statistical object of the node coverage ratio is the number of component connections covered by various node connection methods in the aluminum alloy space structure, not the number of components themselves. The number of component connections refers to the total number of node connections completed using a certain type of node connection method in the structure. Each end of a component corresponds to two node connections, therefore there is no simple one-to-one correspondence between the number of component connections and the number of components. The number of component connections covered by each of the four node connection methods—welded nodes, bolted ball nodes, BOM bolt nodes, and cast aluminum integral nodes—is statistically analyzed in the overall structure. The number of component connections covered by each type of node divided by the sum of the total number of component connections gives the node coverage ratio for that type of node. The sum of the four node coverage ratios equals 1, forming a complete weighting system.

[0027] The specific calculation method for the weighted correction is as follows: using the node coverage ratio corresponding to each type of node connection method as the weight, the initial values ​​of the scrap aluminum recycling rate corresponding to each type of node connection method are weighted and summed. The weighted sum result is the scrap aluminum recycling rate taking into account the node coverage ratio. The physical basis of this correction step is that: in actual aluminum alloy spatial structures, there are often multiple node connection methods simultaneously. Different types of nodes correspond to different initial values ​​of scrap aluminum recycling rates. After the overall structure is dismantled, the actual recycling rate of scrap aluminum depends on the proportion of connections undertaken by each type of node in the structure. The weighted summation with the node coverage ratio as the weight can accurately reflect the contribution of each type of node to the overall scrap aluminum recycling rate. The scrap aluminum recycling rate taking into account the node coverage ratio characterizes the mass fraction of scrap aluminum that can enter the deformed aluminum alloy recycling process with the original alloy grade after the overall dismantling of the aluminum alloy spatial structure. This value is directly used as the input weight for calculating the carbon emission reduction contribution of the recycling path and the downgraded recycling path in the end-of-pipe carbon credit calculation.

[0028] Figure 2 This diagram illustrates the convergence process of the Bayesian update prediction error for the scrap aluminum grade preservation recovery rate in this embodiment. The horizontal axis represents the cumulative number of engineering projects, and the vertical axis represents the prediction error for the scrap aluminum grade preservation recovery rate. The gray dashed line represents the fixed prediction error benchmark of the static model, which remains unchanged across all projects. The black solid line represents the successive convergence trend of the prediction error of the Bayesian update model as the cumulative number of engineering projects increases. The gray shaded area represents the 95% confidence interval. As shown in the figure, the prediction error of the Bayesian update model decreases monotonically and tends to stabilize as the number of engineering cases accumulates, while the prediction error of the static model remains at the initial level. The difference between the two verifies the continuous correction effect of the cross-project closed-loop calibration mechanism of this application on the prediction accuracy of the scrap aluminum grade preservation recovery rate.

[0029] In one specific embodiment, step S2 includes: The difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum is used as the unit carbon credit base under the grade preservation recycling path, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum is used as the unit carbon credit base under the downgrade recycling path. Using the aluminum recycling rate and total aluminum consumption as weights, the unit carbon credit base under the recycling path is numerically calculated to obtain the carbon emission reduction contribution of recycling. Using the supplementary value of the aluminum recycling rate and the total amount of aluminum used as weights, the unit carbon credit base under the downgrade recycling path is numerically calculated to obtain the carbon emission reduction contribution of downgrade recycling. The carbon emission reduction contribution of maintaining the grade and the carbon emission reduction contribution of downgrading are summed to obtain the end-of-pipe carbon credit.

[0030] Specifically, the carbon emission intensity of primary aluminum refers to the carbon dioxide emissions generated per unit mass of primary aluminum produced through the entire process of bauxite mining, alumina extraction, and electrolytic aluminum smelting. The unit is tons of carbon dioxide per ton of aluminum. This value is calculated based on the carbon emission factor of the domestic power grid and the comprehensive electricity consumption of electrolytic aluminum. Under a domestic power grid structure dominated by thermal power, the carbon emission intensity of primary aluminum is approximately 9.344 tons of carbon dioxide per ton of aluminum. The carbon emission intensity of recycled aluminum refers to the carbon dioxide emissions generated per unit mass of recycled aluminum produced through the smelting and refining of scrap aluminum. Because the energy-intensive electrolysis process is eliminated, the carbon emission intensity of recycled aluminum is approximately 0.458 tons of carbon dioxide per ton of aluminum, about 5% of the carbon emission intensity of primary aluminum. The carbon emission intensity of downgraded recycled aluminum refers to the carbon emissions per unit mass generated by directly smelting mixed scrap aluminum without alloy grade separation to produce cast aluminum alloys. Because mixed scrap aluminum has a high content of impurities, additional refining is required. Its carbon emission intensity is higher than that of graded recycled aluminum but lower than that of primary aluminum production, and is approximately 0.62 tons of carbon dioxide per ton of aluminum. The difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum is used as the unit carbon credit base under the grade preservation recycling path. Its physical meaning is the amount of carbon emissions saved by recycling one ton of scrap aluminum to achieve grade preservation recycling compared to producing the same amount of primary aluminum. The difference between the carbon emission intensity of downgraded recycling and the carbon emission intensity of recycled aluminum is used as the unit carbon credit base under the downgrade recycling path. Its physical meaning is the difference in carbon emissions generated by downgrading one ton of scrap aluminum compared to grade preservation recycling.

[0031] The complement of the aluminum scrap recycling rate is the value obtained by subtracting the aluminum scrap recycling rate from the total aluminum scrap recycling rate. Its physical meaning is the mass fraction of aluminum scrap from the dismantling of aluminum alloy space structures that enters the downgrade recycling process. The sum of this value and the aluminum scrap recycling rate is always equal to 1, forming a complete mass allocation relationship. The carbon emission reduction contribution of recycling is calculated as follows: the mass of aluminum scrap entering the recycling process is obtained by multiplying the aluminum scrap recycling rate by the total amount of aluminum used; this is then multiplied by the unit carbon credit base under the recycling path to obtain the total carbon emission reduction under the recycling path. The carbon emission reduction contribution of downgrade recycling is calculated as follows: the mass of aluminum scrap entering the downgrade recycling process is obtained by multiplying the complement of the aluminum scrap recycling rate by the total amount of aluminum used; this is then multiplied by the unit carbon credit base under the downgrade recycling path to obtain the total carbon emission reduction under the downgrade recycling path relative to the entire primary aluminum production path. The carbon emission reduction contribution of graded recycling and the carbon emission reduction contribution of downgraded recycling are summed to obtain the end-of-pipe carbon credit. This value represents the total carbon emission reduction saved by replacing an equivalent amount of primary aluminum production with scrap aluminum from the overall demolition of aluminum alloy spatial structures through the two recycling paths. It increases monotonically with the increase of the graded recycling rate of scrap aluminum.

[0032] In one specific embodiment, step S3 includes: The cross-sectional magnification factor corresponding to each node connection method is determined by the ratio of the required component cross-sectional area under the same span and load conditions to the cross-sectional area of ​​the corresponding component at the welded node. Using the cross-sectional magnification factor and the total amount of aluminum used as weights, the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum in the raw material production stage are weighted according to the purchase ratio to obtain the carbon emissions in the raw material production stage. Using the cross-sectional magnification factor and the total amount of aluminum used as weights, numerical calculations were performed on the product of unit energy consumption and grid carbon emission factor in the component processing stage and the product of transportation distance and transportation carbon emission factor in the transportation stage, respectively, to obtain the carbon emissions in the component processing stage and the carbon emissions in the transportation stage. The construction baseline carbon emissions are corrected and calculated using the construction carbon emission correction coefficient corresponding to the node connection method to obtain the carbon emissions during the construction stage. The carbon emissions during the raw material production stage, component processing stage, transportation stage, and construction stage are summed sequentially to obtain the front-end carbon emissions.

[0033] Specifically, the section magnification factor is determined based on the finite element analysis results of the aluminum alloy spatial structure. Using the constitutive relation of aluminum alloy 6061-T6 as input, and satisfying three types of structural safety constraints—component strength constraint, overall stability constraint, and deflection constraint—the minimum required cross-sectional area of ​​the main load-bearing components is calculated for structures with different node connection methods under the same span and load conditions. The cross-sectional area of ​​the component corresponding to the welded node is used as the benchmark value. The ratio of the cross-sectional area of ​​the component corresponding to each type of node to this benchmark value is the section magnification factor. The section magnification factor for welded nodes is 1. For bolted ball nodes, due to the lower connection stiffness compared to welded nodes leading to a decrease in the equivalent structural stiffness, the section magnification factor is 1.08. For BOM bolted nodes, which have better anti-rotation performance than standard bolted ball nodes, the section magnification factor is 1.05. For cast aluminum integral nodes, whose stiffness is between that of welded and bolted ball nodes, the section magnification factor is 1.03. The carbon emissions during the raw material production stage are calculated by multiplying the cross-sectional magnification factor by the total amount of aluminum used to obtain the actual amount of aluminum used. The comprehensive carbon emission intensity is obtained by weighting the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum according to the procurement ratio. The procurement ratio is the proportion of recycled aluminum mass in the purchased aluminum alloy profiles to the total procurement volume, and the default value is the domestic industry average of 0.20. The carbon emissions during the raw material production stage are obtained by multiplying the actual amount of aluminum used by the comprehensive carbon emission intensity.

[0034] Carbon emissions during the component processing stage are calculated by multiplying the cross-sectional magnification factor by the total aluminum consumption to obtain the actual amount of aluminum processed. The unit carbon emission intensity during the processing stage is calculated by multiplying the unit energy consumption of aluminum alloy profile extrusion processing by the power grid carbon emission factor. For aluminum alloy 6061 series profile extrusion processing, the unit energy consumption is taken as 0.62 kWh per kg. The power grid carbon emission factor is taken as the national average power grid carbon emission factor of 0.581 kg CO2 per kWh. Multiplying the actual amount of aluminum processed by the unit carbon emission intensity during the processing stage yields the carbon emissions during the component processing stage. Carbon emissions during the transportation stage are calculated by multiplying the cross-sectional magnification factor by the total aluminum consumption to obtain the actual amount of aluminum transported. The unit carbon emission intensity during the transportation stage is calculated by multiplying the transportation distance by the road freight carbon emission factor. The road freight carbon emission factor is taken as the value specified in the appendix of GB / T 51366-2019, 0.0000623 tons of CO2 per ton-kilometer. Multiplying the actual amount of aluminum transported by the unit carbon emission intensity during the transportation stage yields the carbon emissions during the transportation stage. The construction carbon emission correction factor reflects the impact of different node connection methods on the number of construction machinery shifts and installation time. Taking the construction baseline carbon emission corresponding to the welded node as the base, the construction carbon emission correction factor is taken as 1.12 for bolted ball nodes because the on-site installation time is more than that for welded nodes, 1.08 for BOM bolt nodes, and 1.05 for cast aluminum integral nodes. The carbon emission of the construction stage is obtained by multiplying the construction carbon emission correction factor by the construction baseline carbon emission. The carbon emission of the raw material production stage, carbon emission of the component processing stage, carbon emission of the transportation stage and carbon emission of the construction stage are summed in sequence to obtain the front-end carbon emission.

[0035] Figure 3 This diagram illustrates the distribution of life-cycle net carbon emission assessment values ​​under the combined influence of the aluminum scrap recycling rate and cross-sectional magnification factor in this application embodiment. The horizontal axis represents the aluminum scrap recycling rate, and the vertical axis represents the cross-sectional magnification factor. The contour lines and grayscale values ​​represent the life-cycle net carbon emission assessment values ​​under the corresponding parameter combinations. The darker the color, the lower the net carbon emission value. The four types of node connection methods are marked with different symbols at their corresponding parameter coordinate positions. As shown in the diagram, the BOM bolt nodes and bolt ball nodes are located in the dark low-carbon area, while the welded nodes are located in the light high-carbon area. The direction of the contour lines reveals that the improvement of the aluminum scrap recycling rate has a significantly stronger effect on reducing life-cycle net carbon emissions than the increase in the cross-sectional magnification factor on increasing front-end carbon emissions.

[0036] In one specific embodiment, step S4 includes: The difference between front-end carbon emissions and end-end carbon credits is used to obtain the net carbon emissions assessment value for the entire life cycle. The net carbon emission intensity per unit of aluminum used in the aluminum alloy space structure is obtained by comparing the net carbon emission assessment value over the entire life cycle with the total amount of aluminum used in the aluminum life cycle. The life-cycle carbon emission reduction benefit value of aluminum alloy space structure relative to steel structure is obtained by subtracting the net carbon emission intensity of unit aluminum consumption over the whole life cycle from the carbon emission intensity of unit steel consumption of steel structure with the same span. The life-cycle net carbon emission assessment value, the life-cycle net carbon emission intensity per unit of aluminum consumption, and the life-cycle carbon emission reduction benefit value are categorized and summarized according to the node connection method to obtain the life-cycle carbon emission assessment report corresponding to each node connection method.

[0037] Specifically, the net carbon emission assessment value for the entire life cycle is obtained by the difference between front-end carbon emissions and end-end carbon credits. Its positive and negative values ​​have clear physical meanings: when the end-end carbon credits are greater than the front-end carbon emissions, the difference is negative, indicating that the aluminum alloy space structure has achieved a net carbon sink effect on a life cycle scale, meaning that the carbon emissions saved by the structure through high-quality recycling of waste aluminum exceed the total carbon emissions generated during its construction process; when the difference is positive, it indicates that front-end carbon emissions exceed end-end carbon credits, and the structure as a whole remains a net carbon source. The net carbon emission intensity per unit of aluminum used throughout the life cycle is obtained by dividing the net carbon emission assessment value for the entire life cycle by the total aluminum used in the aluminum alloy space structure, with units of tons of carbon dioxide per ton of aluminum. This normalized index eliminates the incomparability of absolute carbon emissions between structures of different scales due to differences in total aluminum used, making the carbon emission levels of aluminum alloy space structures with different spans and node types horizontally comparable.

[0038] The life-cycle carbon emission intensity per unit of steel used in steel structures of the same span is determined based on life-cycle carbon emission assessment data for steel structures, covering all stages of steel production, processing, transportation, construction, and dismantling and recycling. The carbon emission intensity from steel production is taken as the average of approximately 2.0 tons of CO2 per ton of steel for domestic converter steelmaking processes. The scrap steel recycling rate from steel structure dismantling is taken as the average of approximately 85% for domestic industry statistics. The carbon emission intensity from scrap steel recycling is taken as approximately 0.4 tons of CO2 per ton of steel for electric arc furnace steelmaking processes. These data are used to calculate the life-cycle carbon emission intensity per unit of steel used in steel structures of the same span. Subtracting the life-cycle net carbon emission intensity per unit of aluminum used in steel structures of the same span from the life-cycle net carbon emission intensity per unit of aluminum used yields the life-cycle carbon reduction benefit value. A negative difference indicates that aluminum alloy space structures have a life-cycle carbon emission advantage over steel structures of the same span; the larger the absolute value of the difference, the more significant the carbon emission advantage. The life-cycle net carbon emission assessment value, the life-cycle net carbon emission intensity per unit of aluminum consumption, and the life-cycle carbon emission reduction benefit value are summarized according to four types of node connection methods: welded nodes, bolted ball nodes, BOM bolt nodes, and cast aluminum integral nodes. The life-cycle carbon emission assessment report corresponding to each node connection method is obtained. The life-cycle carbon emission assessment results of each type of node connection method in the assessment report directly reflect the actual impact of node selection on the life-cycle carbon emission of aluminum alloy space structures.

[0039] The above describes the intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures in the embodiments of this application. The following describes the intelligent assessment system for the full life cycle carbon emissions of aluminum alloy space structures in the embodiments of this application. One embodiment of the intelligent assessment system for the full life cycle carbon emissions of aluminum alloy space structures in the embodiments of this application includes: The calculation module is used to compare the number of times that the alloy grade can be completely separated during the dismantling operation of each node connection method in the aluminum alloy space structure with the total number of dismantling verifications to obtain the dismantling parameters. The dismantling parameters are then used to perform linear interpolation calculations with the upper and lower limits of the grade preservation and recovery rate to obtain the grade preservation and recovery rate of scrap aluminum corresponding to each node connection method. The summation module is used to take the difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum as the unit carbon credit base for grade preservation and downgraded recycling, respectively. The module uses the grade preservation recycling rate of waste aluminum and the total amount of aluminum used as weights to calculate the carbon emission reduction contribution of grade preservation and downgraded recycling paths, and then sums them to obtain the end carbon credit. The weighting module is used to sum the carbon emission values ​​of each stage of raw material production, component processing, transportation and construction in sequence, with the cross-sectional magnification factor corresponding to the node connection method as the weight, to obtain the front-end carbon emission. An assessment module is used to calculate the difference between the front-end carbon emissions and the end-end carbon credit to obtain a net carbon emission assessment value for the entire life cycle.

[0040] This invention also provides an intelligent assessment device for the entire life cycle carbon emissions of aluminum alloy space structures, which can be a server. The device includes a processor, memory, display screen, input device, network interface, and database connected via a system bus. The processor, designed as a computer, provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores the data corresponding to this embodiment. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements the above-described method.

[0041] The present invention also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when the instructions are executed on a computer, cause the computer to perform the steps of the intelligent assessment method for the carbon emissions of the aluminum alloy space structure throughout its entire life cycle.

[0042] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0043] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an intelligent assessment device for the full life cycle carbon emissions of an aluminum alloy space structure (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for intelligent assessment of carbon emissions throughout the entire life cycle of aluminum alloy space structures, characterized in that, The method includes: Step S1: Compare the number of times the alloy grade can be completely separated during the dismantling operation of each node connection method in the aluminum alloy space structure with the total number of dismantling verifications to obtain the dismantling performance parameter. Perform linear interpolation calculation with the dismantling performance parameter and the upper and lower limits of the grade preservation recovery rate to obtain the grade preservation recovery rate of waste aluminum corresponding to each node connection method. Step S2: The difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum are used as the unit carbon credit base for grade preservation and downgraded recycling, respectively. The carbon emission reduction contribution of grade preservation and downgraded recycling is numerically calculated and summed with the grade preservation rate of scrap aluminum and the total amount of aluminum used as weights to obtain the end carbon credit. Step S3: Using the cross-sectional magnification factor corresponding to the node connection method as the weight, the carbon emission values ​​of each stage of raw material production, component processing, transportation and construction are weighted and summed sequentially to obtain the front-end carbon emission. Step S4: Divide the front-end carbon emissions with the end-end carbon credits to obtain the net carbon emissions assessment value for the entire life cycle.

2. The intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures according to claim 1, characterized in that, In step S1, the number of times the alloy grade could be completely separated during the dismantling operation by comparing the number of times the connection method of each node in the aluminum alloy spatial structure was used to verify the dismantling performance is obtained, including: The node connection methods in aluminum alloy spatial structures are classified into four categories: welded nodes, bolted ball nodes, BOM bolt nodes, and cast aluminum integral nodes. For each of the four types of node connection methods, no less than 30 sets of dismantling verification tests were conducted under standard dismantling process conditions. The number of times that the alloy grade was completely separated in the dismantling verification tests for each type of node connection method was counted. The number of times the alloy grade was completely separated was compared with the total number of disassembly verifications, and the arithmetic mean was taken to obtain the disassembly parameters corresponding to the connection methods of each node.

3. The intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures according to claim 2, characterized in that, In step S1, the initial value of the scrap aluminum recycling rate is obtained by linear interpolation calculation using the dismantling parameters and the upper and lower limits of the grade preservation recovery rate, including: The recycling rate of scrap aluminum corresponding to a fully welded structure is used as the lower limit of the recycling rate. The recycling rate of scrap aluminum corresponding to a fully removable bolt structure is taken as the upper limit of the recycling rate. Based on the dismantling parameters, the lower limit of the grade preservation recovery rate and the upper limit of the grade preservation recovery rate, linear interpolation is performed to obtain the initial value of the grade preservation recovery rate of waste aluminum corresponding to each node connection method.

4. The intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures according to claim 3, characterized in that, The step S1, which obtains the graded recycling rate of scrap aluminum corresponding to the connection method of each node, also includes: The node coverage ratio is obtained by statistically analyzing the proportion of the number of component connections covered by each node connection method to the total number of component connections in the aluminum alloy space structure. The initial value of the waste aluminum grade preservation recovery rate is weighted and corrected based on the node coverage ratio to obtain the waste aluminum grade preservation recovery rate taking into account the node coverage ratio. The waste aluminum grade preservation recovery rate is then used as the calculation input for the end-of-life carbon credit.

5. The intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures according to claim 1, characterized in that, Step S2 includes: The difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum is used as the unit carbon credit base under the grade preservation recycling path, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum is used as the unit carbon credit base under the downgrade recycling path. Using the aluminum recycling rate and total aluminum consumption as weights, the unit carbon credit base under the recycling path is numerically calculated to obtain the carbon emission reduction contribution of recycling. Using the supplementary value of the waste aluminum recycling rate and the total amount of aluminum used as weights, the unit carbon credit base under the downgraded recycling path is numerically calculated to obtain the carbon emission reduction contribution of downgraded recycling. The carbon emission reduction contribution of the grade-maintaining recovery and the carbon emission reduction contribution of the grade-downgrading recovery are summed to obtain the end-of-pipe carbon credit.

6. The intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures according to claim 1, characterized in that, Step S3 includes: The cross-sectional magnification factor corresponding to each node connection method is determined by the ratio of the required component cross-sectional area under the same span and load conditions to the cross-sectional area of ​​the corresponding component at the welded node. Using the cross-sectional magnification factor and the total amount of aluminum used as weights, the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum in the raw material production stage are weighted according to the purchase ratio to obtain the carbon emissions in the raw material production stage. Using the cross-sectional magnification factor and the total amount of aluminum used as weights, numerical calculations are performed on the product of unit energy consumption and grid carbon emission factor in the component processing stage and the product of transportation distance and transportation carbon emission factor in the transportation stage, respectively, to obtain carbon emissions in the component processing stage and carbon emissions in the transportation stage. The construction baseline carbon emissions are corrected and calculated using the construction carbon emission correction coefficient corresponding to the node connection method to obtain the carbon emissions during the construction stage. The carbon emissions during the raw material production stage, the carbon emissions during the component processing stage, the carbon emissions during the transportation stage, and the carbon emissions during the construction stage are summed sequentially to obtain the front-end carbon emissions.

7. The intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures according to claim 1, characterized in that, Step S4 includes: The difference between the front-end carbon emissions and the end-end carbon credit is used to obtain the net carbon emissions assessment value for the entire life cycle. By comparing the aforementioned net carbon emission assessment value over the entire life cycle with the total amount of aluminum used in the aluminum alloy space structure, the net carbon emission intensity per unit amount of aluminum used over the entire life cycle is obtained. The difference between the net carbon emission intensity per unit of aluminum used over the entire life cycle and the carbon emission intensity per unit of steel used in the corresponding steel structure of the same span is used to obtain the carbon emission reduction benefit value of aluminum alloy space structure relative to steel structure over the entire life cycle. The life-cycle net carbon emission assessment value, the life-cycle net carbon emission intensity per unit of aluminum consumption, and the life-cycle carbon emission reduction benefit value are categorized and summarized according to the node connection method to obtain the life-cycle carbon emission assessment report corresponding to each node connection method.

8. A smart assessment system for the full life-cycle carbon emissions of aluminum alloy space structures, characterized in that, For implementing the intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures as described in any one of claims 1-7, the intelligent assessment system for the full life cycle carbon emissions of aluminum alloy space structures comprises: The calculation module is used to compare the number of times that the alloy grade can be completely separated during the dismantling operation of each node connection method in the aluminum alloy space structure with the total number of dismantling verifications to obtain the dismantling parameters. The dismantling parameters are then used to perform linear interpolation calculations with the upper and lower limits of the grade preservation and recovery rate to obtain the grade preservation and recovery rate of scrap aluminum corresponding to each node connection method. The summation module is used to take the difference between the carbon emission intensity of primary aluminum and the carbon emission intensity of recycled aluminum, and the difference between the carbon emission intensity of downgraded recycled aluminum and the carbon emission intensity of recycled aluminum as the unit carbon credit base for grade preservation and downgraded recycling, respectively. The module uses the grade preservation recycling rate of waste aluminum and the total amount of aluminum used as weights to calculate the carbon emission reduction contribution of grade preservation and downgraded recycling paths, and then sums them to obtain the end carbon credit. The weighting module is used to sum the carbon emission values ​​of each stage of raw material production, component processing, transportation and construction in sequence, with the cross-sectional magnification factor corresponding to the node connection method as the weight, to obtain the front-end carbon emission. The assessment module is used to calculate the difference between the front-end carbon emissions and the end-end carbon credit to obtain a net carbon emission assessment value for the entire life cycle.

9. A smart assessment device for the full life-cycle carbon emissions of an aluminum alloy space structure, characterized in that, It includes a memory and a processor, the memory storing a computer program that can run on the processor, and the processor executing the computer program to implement the intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is run by the processor, the processor executes the intelligent assessment method for the full life cycle carbon emissions of aluminum alloy space structures as described in any one of claims 1 to 7.

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