Evaluation method for global warming influence potential value of metallurgical electrode product

Abstract

The invention discloses an evaluation method for a global warming influence potential value of an electrode product for metallurgy. The evaluation method comprises the following steps: S1, defining a target and an evaluation range; s2, constructing a life cycle list; s3, processing the multi-output flow by a physical distribution method: distributing the generated environmental load according to the physical attribute proportion of mass, energy or heat value and the like between the main product and the by-product for the unit process with the multi-output condition, and forming a life cycle list of the metallurgical electrode product based on the functional unit; s4, environmental influence evaluation; and S5, result interpretation and optimization suggestion. The method has the advantages that the full-life-cycle environmental influence of the metallurgical electrode product is quantified comprehensively and objectively, a solid theoretical support is provided for upgrading of a production process and carbon and emission reduction in the whole process, and meanwhile, a powerful basis is provided for green attribute authentication and market promotion of the product.

Description

Technical Field

[0001] This invention belongs to the interdisciplinary technical field of electrode production and environmental impact assessment, and in particular relates to a method for evaluating the global warming impact potential of metallurgical electrode products. Background Technology

[0002] Currently, industrial enterprises evaluate the effectiveness of waste gas emission reduction based on indicators such as waste gas treatment rate and emission reduction ratio. However, such methods are difficult to systematically reflect the impact of emission reduction measures on the overall level of greenhouse gas emissions before and after implementation from the perspective of environmental effects.

[0003] Life Cycle Assessment (LCA) is a method for systematically analyzing and quantifying the environmental impact of a product throughout its entire life cycle, from manufacturing and use to disposal and recycling. It has been widely applied in the field of product environmental performance evaluation. However, for the specific sector of metallurgical electrode products, existing technologies have not yet developed a life cycle carbon emission assessment method suitable for its production processes. This makes it difficult for companies to quantify the environmental impact of their production processes using global warming potential, thus limiting the scientific evaluation of the effectiveness of their carbon emission management and reduction measures. Summary of the Invention

[0004] The purpose of this invention is to address the lack of corresponding evaluation methods for existing metallurgical electrodes. It provides an evaluation method for the global warming impact potential of metallurgical electrode products, which quantifies greenhouse gas emissions from the acquisition and transportation of raw materials to the manufacturing stage, providing technical support for process optimization, emission reduction strategy formulation, and green product certification.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for evaluating the global warming impact potential of metallurgical electrode products is based on process-oriented life cycle assessment. It establishes a product life cycle data list by clearly defining the evaluation object, functional unit, and system boundary, and then uses a suitable characteristic model to quantify greenhouse gas emissions, thereby obtaining the global warming impact potential of metallurgical electrode products. The specific implementation steps are as follows: S1. Definition of objectives and evaluation scope: Clarify the evaluation subject and core object, define the functional unit of the evaluation object, define the boundary scope of the metallurgical electrode product system, and build a basic framework for subsequent evaluation work. S2, Lifecycle Inventory Construction: Based on the logical relationships between production processes, the production process of metallurgical electrode products is broken down into a set of well-defined unit processes. The system collects the input and output data of each unit process and supplements and traces the data in conjunction with a professional background database to form a process-level lifecycle inventory that has not been assigned. S3, Physical allocation method for handling multi-output flow: For unit processes with multiple outputs, the environmental load generated is allocated according to the ratio of physical properties such as quality, energy or calorific value between main products and by-products, forming a life cycle list of metallurgical electrode products based on functional units. S4, Environmental Impact Assessment: Based on the life cycle assessment methodology, conduct a global warming impact potential assessment on the physical allocation of the metallurgical electrode product life cycle inventory to obtain the global warming impact potential of the metallurgical electrode product. S5, Results Interpretation and Optimization Recommendations: A systematic interpretation of the impact assessment results of global warming potential is provided, and emission reduction recommendations based on process optimization and energy structure adjustment are proposed.

[0006] Furthermore, in step S3, for unit processes with multiple outputs, the environmental load allocation method is determined based on the actual physical output characteristics of the main product and by-products in the unit process. Combining the recycling methods and physical differences of by-products in the metallurgical electrode production process, the allocation is prioritized according to the mass ratio. The environmental load allocated to the metallurgical electrode products is included in the life cycle list, forming a metallurgical electrode product life cycle list based on functional units.

[0007] Furthermore, in step S1, the evaluation object is: metallurgical electrode products produced by the calcination and impregnation process. The inputs and outputs of resource consumption, energy input and pollutant emissions at each stage of their life cycle are systematically collected, and the resulting carbon footprint of the products is accurately quantified and evaluated.

[0008] Furthermore, in step S1, the functional unit is 1 ton of metallurgical electrode products produced by the roasting-impregnation method, which serves as the benchmark for standardizing the measurement of evaluation data.

[0009] Furthermore, in step S1, the boundary range is: the raw and auxiliary materials and energy production stage, the raw and auxiliary materials transportation stage, and the metallurgical electrode product manufacturing stage.

[0010] Furthermore, in step S2, the input and output data include the consumption of raw and auxiliary materials, energy consumption, product / by-product output, and pollutant emissions. Simultaneously, the process-level life cycle inventory reflects the basic flow input and output of each unit process within the defined life cycle boundary. The basic flow refers to unprocessed natural substances or energy, and is the smallest unit for quantifying environmental load in the life cycle assessment method. g The cumulative amount is calculated using the following formula: ; In the formula, b T, F, g Used to characterize functional unitsF Under these conditions, basic flow g The cumulative amount over the entire lifecycle; b F, g Represents the basic flow g Direct emissions or consumption during the product manufacturing stage; a T, i Indicates the raw materials or energy in the unit process i Direct consumption in; S a T, i b i, g This represents the cumulative amount of the basic flow g in the relevant upstream and downstream unit processes.

[0011] Furthermore, in step S4, the assessment of the global warming impact potential uses the physically allocated lifecycle inventory of metallurgical electrode products as input data, and is implemented according to the following process: S41, Model Selection and Data Classification: Based on the emission characteristics of metallurgical electrode products, select an environmental impact assessment model that is compatible with the types of global warming impacts, and classify and organize the basic flows in the product life cycle inventory according to the types of environmental impacts. S42, Characteristic Quantitative Analysis: Based on the classified life cycle inventory data, the damage degree of different basic flows to various environmental impacts is analyzed, different basic flows are converted into equivalent values ​​with unified dimensions, and the characteristic results of each basic flow are summarized to obtain the characteristic calculation results of the carbon footprint impact of metallurgical electrode products. S43, Normalization and Weighted Calculation: The characteristic results are normalized to eliminate dimensional differences, and weighted calculation is performed by combining industry-representative weight coefficients to finally obtain the global warming impact potential of metallurgical electrode products.

[0012] Furthermore, in step S42, the classification of the inventory data is based on the environmental impact type. Basic flows belonging to the same environmental impact type are aggregated, and a unified indicator transformation is achieved through a feature model. The feature calculation of the environmental impact results is performed according to the following formula: ; In the formula, C j Indicate the type of environmental impact j The characteristic calculation results; m i Represents the basic flow i The list statistics results; Q ji Basic Flow i Types of environmental impact j Characterization factors.

[0013] Furthermore, in step S43, the characteristic results are normalized to eliminate dimensional differences between different types of environmental impacts. The normalization calculation is performed according to the following formula: ; In the formula: N j Indicate the type of environmental impact j The normalization result; C j Indicate the type of environmental impact j Characterization results; S j Indicates the corresponding environmental impact type j The normalized coefficient.

[0014] Furthermore, in step S5, the result interpretation process must strictly follow the requirements of ISO14040 and ISO14044 standards. By systematically analyzing the key information in the inventory analysis and environmental impact assessment results, and combining the evaluation objectives, a professional interpretation conclusion is formed, providing theoretical support for the clean production process design and low-carbon technology upgrade of metallurgical electrode products.

[0015] In the technical solution of this invention, by introducing a life cycle inventory construction method adapted to the characteristics of metallurgical electrode production process, and combining it with the physical allocation principle of multi-output unit process, a systematic quantitative evaluation of greenhouse gas emissions of metallurgical electrode products in the "cradle to gate" range is realized. This can more realistically reflect the environmental impact level of the product production process and provide reliable technical support for enterprises to carry out carbon emission management and emission reduction effect assessment. Attached Figure Description

[0016] Figure 1 This is a system boundary diagram of the product lifecycle of metallurgical electrodes in an embodiment of the present invention; Figure 2 This is a schematic diagram of the carbon footprint calculation process for metallurgical electrode products of the present invention; Figure 3 This is a summary lifecycle inventory form table in the embodiments of the present invention; Figure 4 This is a table illustrating the types of environmental impacts and their associated environmental loads in embodiments of the present invention. Detailed Implementation Example

[0018] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a method for evaluating the global warming impact potential of metallurgical electrode products according to the present invention. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the present invention.

[0019] This embodiment uses the production of large-size graphite electrodes as an example for detailed explanation. (See also...) Figure 2 The specific steps are as follows: (I) The evaluation object is defined as large-format graphite electrode products produced using the calcination-impregnation process. The functional unit is defined as 1 ton of graphite electrode products produced using the calcination-impregnation method. The life cycle system boundary is defined according to the "cradle to gate" principle, covering the raw material and energy production stage, the raw material transportation stage, and the product manufacturing stage, such as... Figure 1 As shown.

[0020] (II) Based on the specific production process, the life cycle is divided into several well-defined and interconnected unit processes to facilitate life cycle inventory analysis. The system collects and summarizes input and output data related to raw material consumption, energy consumption, product and by-product output, and pollutant emissions during the graphite electrode life cycle, forming an unprocessed process-level life cycle inventory. Its specific form is as follows: Figure 3 As shown.

[0021] (III) Supplement and trace the life cycle inventory by linking to the background database, transforming it into life cycle inventory data containing only basic flows. Basic flows are substances or energy directly derived from the natural environment without human transformation, serving as the basic unit for quantifying environmental load in life cycle assessment. The calculation formulas are as follows: ; In the formula, b T, F, g Used to characterize functional units F Under these conditions, basic flow g The cumulative amount over the entire lifecycle; b F, g ; indicates the amount of basic flow g directly emitted or consumed during the product manufacturing stage; a T, i Indicates the raw materials or energy in the unit process i Direct consumption in; S a T, i b i, g This represents the cumulative amount of the basic flow g in the relevant upstream and downstream unit processes.

[0022] (iii) For multi-output unit processes, taking into account the recycling methods and physical differences of by-products in the graphite electrode production process, priority should be given to allocating according to mass ratio, and the environmental load allocated to graphite electrode products should be included in the life cycle inventory, and further assessment of their global warming impact potential should be carried out.

[0023] Product lifecycle inventory data classification categorizes inventory data under specific environmental impact types, such as global warming, acidification, eutrophication, photochemical ozone synthesis, and ozone depletion.

[0024] See Figure 3 The classification of inventory data involves aggregating basic flows belonging to the same type of environmental impact. First, the basic flows in the lifecycle inventory are classified according to their global warming impact type. Then, a characteristic model is used to convert different basic flows into unified equivalent indicators. Finally, normalization is applied to eliminate differences in the units of measurement among different environmental impact indicators. The formulas for environmental impact characteristicization and normalization are shown below: ; ; In the formula, C j Indicate the type of environmental impact j The characteristic calculation results; m i Represents the basic flow i The list statistics results; Q ji Basic Flow i Types of environmental impact j Characterization factors; N j Indicate the type of environmental impact j The normalization result; C j Indicate the type of environmental impact j Characterization results; S j Indicates the corresponding environmental impact type j The normalized coefficient.

[0025] In this embodiment, the IPCC 2021 life cycle environmental impact assessment method is selected to perform characteristic analysis on the life cycle inventory data. Examples of environmental impact types are as follows: Figure 4 As shown.

[0026] After obtaining the global warming impact potential assessment results for graphite electrode products, the contributions of each unit process and major emission sources were analyzed and interpreted. The results show that electricity consumption accounts for a relatively high proportion of the global warming impact potential throughout the production process. By increasing the proportion of renewable and clean energy use and reducing the proportion of thermal power use, the greenhouse gas emission levels of graphite electrode products can be effectively reduced.

[0027] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for evaluating the global warming impact potential of metallurgical electrode products, characterized in that: S1. Definition of objectives and evaluation scope: Clarify the evaluation subject and core object, define the functional unit of the evaluation object, define the boundary scope of the metallurgical electrode product system, and build a basic framework for subsequent evaluation work. S2, Lifecycle Inventory Construction: Based on the logical relationships between production processes, the production process of metallurgical electrode products is broken down into a set of well-defined unit processes. The system collects the input and output data of each unit process and supplements and traces the data in conjunction with a professional background database to form a process-level lifecycle inventory that has not been assigned. S3, Physical allocation method for handling multi-output flow: For unit processes with multiple outputs, the environmental load generated is allocated according to the ratio of physical properties such as quality, energy or calorific value between main products and by-products, forming a life cycle list of metallurgical electrode products based on functional units. S4, Environmental Impact Assessment: Based on the life cycle assessment methodology, conduct a global warming impact potential assessment on the physical allocation of the metallurgical electrode product life cycle inventory to obtain the global warming impact potential of the metallurgical electrode product. S5, Results Interpretation and Optimization Recommendations: A systematic interpretation of the impact assessment results of global warming potential is provided, and emission reduction recommendations based on process optimization and energy structure adjustment are proposed.

2. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 1, characterized in that: In step S3, for unit processes with multiple outputs, the environmental load allocation method is determined based on the actual physical output characteristics of the main product and by-products in the unit process. Combining the recycling methods and physical differences of by-products in the metallurgical electrode production process, the allocation is prioritized according to the mass ratio. The environmental load allocated to the metallurgical electrode products is included in the life cycle list, forming a metallurgical electrode product life cycle list based on functional units.

3. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 2, characterized in that: In step S1, the evaluation object is: metallurgical electrode products produced by the calcination and impregnation process. The inputs and outputs of resource consumption, energy input and pollutant emissions at each stage of their life cycle are systematically collected, and the resulting carbon footprint of the products is accurately quantified and evaluated.

4. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 2 or 3, characterized in that: In step S1, the functional unit is 1 ton of metallurgical electrode products produced by the roasting-impregnation method, which serves as the benchmark for the standardized measurement of evaluation data.

5. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 2 or 3, characterized in that: In step S1, the boundary range is: the raw and auxiliary materials and energy production stage, the raw and auxiliary materials transportation stage, and the metallurgical electrode product manufacturing stage.

6. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 2 or 3, characterized in that: In step S2, the input and output data include the consumption of raw and auxiliary materials, energy consumption, product / by-product output, and pollutant emissions. Simultaneously, the process-level life cycle inventory reflects the basic flow input and output of each unit process within the defined life cycle boundary. The basic flow refers to unprocessed natural substances or energy, and is the smallest unit for quantifying environmental load in life cycle assessment methods. g The cumulative amount is calculated using the following formula: ； In the formula, b T, F, g Used to characterize functional units F Under these conditions, basic flow g The cumulative amount over the entire lifecycle; b F, g Represents the basic flow g Direct emissions or consumption during the product manufacturing stage; a T, i Indicates the raw materials or energy in the unit process i Direct consumption in; S a T, i b i, g This represents the cumulative amount of the basic flow g in the relevant upstream and downstream unit processes.

7. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 2 or 3, characterized in that: In step S4, the assessment of the global warming impact potential uses the physically allocated lifecycle inventory of metallurgical electrode products as input data, and is carried out according to the following process: S41, Model Selection and Data Classification: Based on the emission characteristics of metallurgical electrode products, select an environmental impact assessment model that is compatible with the types of global warming impacts, and classify and organize the basic flows in the product life cycle inventory according to the types of environmental impacts. S42, Characteristic Quantitative Analysis: Based on the classified life cycle inventory data, the damage degree of different basic flows to various environmental impacts is analyzed, different basic flows are converted into equivalent values ​​with unified dimensions, and the characteristic results of each basic flow are summarized to obtain the characteristic calculation results of the carbon footprint impact of metallurgical electrode products. S43, Normalization and Weighted Calculation: The characteristic results are normalized to eliminate dimensional differences, and weighted calculation is performed by combining industry-representative weight coefficients to finally obtain the global warming impact potential of metallurgical electrode products.

8. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 7, characterized in that: In step S42, the classification of inventory data is based on environmental impact type. Basic flows belonging to the same environmental impact type are aggregated, and a unified indicator transformation is achieved through a feature model. The feature calculation of environmental impact results is performed according to the following formula: ； In the formula, C j Indicates the type of environmental impact j The characteristic calculation results; m i Represents the basic flow i The list statistics results; Q ji Basic Flow i Types of environmental impact j Characterization factors.

9. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 7, characterized in that: In step S43, the characteristic results are normalized to eliminate the dimensional differences between different types of environmental impacts. The normalization calculation is performed according to the following formula: ； In the formula: N j Indicates the type of environmental impact j The normalization result; C j Indicates the type of environmental impact j Characterization results; S j Indicates the corresponding environmental impact type j The normalized coefficient.

10. The method for evaluating the global warming impact potential of metallurgical electrode products according to claim 2 or 3, characterized in that: In step S5, the results interpretation process must strictly follow the requirements of ISO 14040 and ISO 14044 standards. By systematically analyzing the key information in the inventory analysis and environmental impact assessment results, and combining it with the assessment objectives, a professional interpretation conclusion is formed.

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