Waste LED display screen recycling carbon emission reduction benefit evaluation method

Abstract

The invention discloses a waste LED display screen recycling carbon emission reduction benefit evaluation method. According to the method, carbon emission and emission reduction in three stages of disassembly, component resource recycling and final waste disposal in the recycling process of the waste LED display screen under different resource strategies are comprehensively considered; the resource recycling stage comprises recycling of the shell, the printed circuit board and the LED lamp beads. And the overall carbon emission reduction benefit of recycling and reusing the waste LED display screen is obtained by subtracting the carbon emission in the disassembling stage, the resource recycling stage and the final treatment stage from the total carbon emission reduction produced by replacing a raw material with a regenerated material in the resource recycling stage. The method has the advantages of being clear in process, comprehensive in system and easy to expand. Meanwhile, the evaluation result is comprehensively analyzed, carbon emission key influence factors and carbon emission reduction benefit main contribution links in the waste LED display screen recycling and reusing process can be accurately recognized, and important data support is provided for development of the waste LED display screen recycling technology in the future.

Description

Technical Field

[0001] The invention belongs to the technical field of recycling and reusing electronic waste, and specifically relates to a method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens. Background Art

[0002] As a new type of electronic device, LED has developed rapidly around the world with its many advantages such as high efficiency, energy saving, safety, stability, intelligent controllability, etc. The global LED display market size reached 7 billion US dollars in 2022, and it is expected to grow to 10.7 billion US dollars in 2027. With the widespread application of LED displays, a large number of waste LED displays will inevitably be generated in the future to be processed and disposed of. Therefore, waste LED displays face huge management challenges, and there is an urgent need to adopt practical resource strategies to mitigate the negative environmental impact that waste LED displays may bring.

[0003] At present, more research on the recycling and reuse of waste LED screens focuses on the field of resource recovery technology, and lacks a systematic and comprehensive evaluation of the carbon emission reduction benefits of recycling and reuse throughout the entire life cycle. Therefore, a complete set of evaluation methods for the carbon emission reduction benefits of recycling and reuse of waste LED screens is needed to effectively evaluate its carbon emission reduction benefits and provide a scientific basis for the optimization of recycling technology and the improvement of carbon emission reduction benefits. Summary of the invention

[0004] The present invention aims to provide a method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens based on a life cycle perspective. Through this method, the carbon emission reduction benefits of recycling and reusing waste LED display screens can be systematically and comprehensively evaluated, and the key influencing factors of carbon emissions and the main contribution links to carbon emission reduction benefits can be identified.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED screens, wherein the system boundary of the recycling and reusing process of waste LED screens includes the disassembly of LED screens, resource recovery of components and final disposal of wastes. The carbon emissions and emission reductions of the whole process are evaluated based on different resource recovery and utilization strategies, and the overall carbon emission reduction benefits of recycling and reusing waste LED screens under different strategies can be evaluated; wherein:

[0007] During the disassembly phase, waste LED displays are disassembled into three major components: housing, printed circuit boards (PCBs) and LED lamp beads. The carbon emissions mainly come from energy consumption such as electricity;

[0008] The component recycling stage is divided into shell recycling, PCB recycling and LED lamp bead recycling. Its carbon emissions mainly come from the consumption of various resources and energy in the recycling process, and the carbon emission reduction is generated by the replacement of virgin materials with recycled materials.

[0009] The final disposal stage mainly includes the final disposal of wastewater, waste gas and solid waste generated during the disassembly and recycling of shells, PCBs and LED lamp beads. Its carbon emissions mainly come from the consumption of various resources and energy in the final disposal process and direct emissions to the environment;

[0010] The overall carbon emission reduction benefit of recycling and reusing waste LED display screens is obtained by subtracting the carbon emissions in the disassembly stage, resource recovery stage and final disposal stage from the total carbon emission reduction produced by replacing virgin materials with recycled materials in the resource recovery stage.

[0011] Furthermore, the sources of carbon emission reduction under different resource recycling strategies are as follows:

[0012] The shell is mainly made of metal or plastic. Metal materials are usually recycled by physical crushing and sorting, chemical leaching adsorption, chemical leaching electrolysis and other processes. Plastics are usually recycled by physical melting regeneration, modified regeneration granulation and other processes. The carbon emission reduction comes from the replacement of primary metal and primary plastic production by recycled metal materials or recycled plastics.

[0013] PCBs are mainly composed of metallic copper and epoxy resin. The metallic copper is usually recycled by physical crushing and sorting, chemical leaching adsorption, chemical leaching electrolysis and other processes. The carbon emission reduction comes from the replacement of primary copper production by recycled copper.

[0014] LED lamp beads are rich in a variety of valuable metal materials (copper, gallium, gold and silver, etc.) and epoxy resin. Metal materials are usually recycled by physical crushing and sorting, chemical leaching adsorption, chemical leaching electrolysis and other processes. The carbon emission reduction from resource recycling varies depending on the recycling strategy. The carbon emission reduction comes from the replacement of primary metal production by recycled copper, recycled gallium, recycled gold and recycled silver.

[0015] Furthermore, the carbon emission reduction of the LED lamp beads under different resource recycling strategies, the recycled metals produced by different recycling strategies are different, and recycled metals such as copper, gallium, gold and silver can be recycled and produced simultaneously or separately.

[0016] Furthermore, the carbon emission reduction benefit evaluation method for recycling and reusing waste LED display screens is calculated as follows:

[0017] CB=∑CB n,m -(C d +C r +Ch )

[0018] in:

[0019] CB——Carbon emission reduction benefits of recycling and reusing waste LED displays, kg CO 2 eq.;

[0020] CB n,m ——Carbon emission reduction caused by replacing virgin materials with recycled materials m in the resource recovery stage of component n, kg CO 2 eq.;

[0021] C d ——Carbon emissions during dismantling, kg CO 2 eq.;

[0022] C r ——Carbon emissions during the component recycling phase, kg CO 2 eq.;

[0023] C h ——Carbon emissions in the final disposal stage, kg CO 2 eq.

[0024] Furthermore, the calculation formula for carbon emissions at each stage of recycling and reuse of waste LED display screens is:

[0025] (1) Carbon emissions during dismantling stage:

[0026] C d =E d ·F e

[0027] in:

[0028] C d ——Carbon emissions during dismantling, kg CO 2 eq.;

[0029] E d ——Power consumption during disassembly phase, kWh;

[0030] F e ——Electricity carbon dioxide emission factor, kg CO 2 eq. / kWh;

[0031] (2) Carbon emissions in the component recycling stage:

[0032] C r =∑Mr x ·F x +∑Er i ·F i

[0033] in:

[0034] C r =∑Mr n,x ·F x +∑Er n,i ·F i

[0035] in:

[0036] C r ——Carbon emissions during the component recycling phase, kg CO 2 eq.;

[0037] Mr n,x ——Consumption of material x in the resource recovery stage of component n, kg;

[0038] F x ——Carbon emission factor of substance x, kg CO 2 eq. / kg;

[0039] Er n,i ——The consumption of energy i invested in the resource recovery stage of component n, kg or kWh;

[0040] F i ——Carbon emission factor of energy source x, kg CO 2 eq. / kg or kg CO 2 eq. / kWh;

[0041] (3) Carbon emissions in the final disposal stage:

[0042] C h =∑Mh t ·F t

[0043] in:

[0044] C h ——Carbon emissions in the final disposal stage, kg CO 2 eq.;

[0045] Mh t ——The amount of waste t generated at the final disposal site, kg;

[0046] F t ——Carbon emission factor corresponding to the final disposal of waste t, kg CO 2 eq. / kg.

[0047] Furthermore, the calculation formula for the carbon emission reduction generated by the output of recycled materials from the recycled components of the waste LED display screen replacing the original materials is:

[0048] CB n,m =MB n,m ·F n

[0049] in:

[0050] CB n,m ——Carbon emission reduction when recycled materials m replace virgin materials in the resource recovery stage of component n, kg CO 2 eq.;

[0051] MB n,m ——The amount of recycled material m generated in the resource recovery stage of component n, kg;

[0052] F n ——Carbon emission factor of recycled materials replacing virgin materials, kg CO 2 eq. / kg.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] The present invention quantitatively evaluates the carbon emission reduction benefits of recycling and reusing waste LED display screens, and can accurately quantify the carbon emissions at each stage of the recycling and reusing process of waste LED display screens under different resource strategies, as well as the carbon emission reduction brought about by the replacement of virgin materials with recycled materials during the component resource recovery stage. The present invention can identify the key influencing factors of carbon emissions and the main contribution links to carbon emission reduction benefits by analyzing the carbon emissions and emission reduction data of the recycling and reusing process of waste LED display screens in detail, and can provide important data support for the development of future waste LED display screen recycling technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 The present invention is a process schematic diagram of a method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens.

[0056] Figure 2 This is a system boundary diagram of the life cycle of a waste LED display recycling and reuse process of the present invention. DETAILED DESCRIPTION

[0057] The method of the present invention comprehensively considers the carbon emissions and emission reductions at each stage in the process of recycling and reusing waste LED display screens under different resource strategies, specifically including three stages: disassembly, component resource recovery and final disposal of waste. Among them, the resource recovery stage includes the resource recovery of the shell, printed circuit boards (PCBs) and LED lamp beads in the waste LED display screen. The overall carbon emission reduction benefit of the recycling and reuse of waste LED display screens is obtained by subtracting the carbon emissions in the disassembly stage, resource recovery stage and final disposal stage from the total carbon emission reduction produced by replacing the original materials with recycled materials in the resource recovery stage. The present invention can realize the evaluation of the overall carbon emission reduction benefits of the recycling and reuse of waste LED display screens under different strategies, and has the characteristics of clear process, comprehensive system and easy expansion. At the same time, the comprehensive analysis and evaluation results can also accurately identify the key influencing factors of carbon emissions in the recycling and reuse process of waste LED display screens and the main contribution links to carbon emission reduction benefits, providing important data support for the development of future waste LED display screen recycling technology.

[0058] The specific implementation of the present invention is further described below in conjunction with the technical scheme and the accompanying drawings.

[0059] Example 1

[0060] This embodiment takes the carbon emission reduction benefit evaluation process of recycling 1 ton of waste LED display screen, where the waste LED display screen is composed of a plastic shell, PCBs and LED lamp beads, and recovering PC (Polycarbonate, PC) plastic from the plastic shell, copper from PCBs and gallium from LED lamp beads as an example to further illustrate the present invention.

[0061] In this example, see Figure 2 As shown in the figure, the system boundary of the waste LED display recycling and reuse process includes the LED display disassembly, component resource recovery and waste final disposal stages;

[0062] Functional unit: The evaluation is conducted based on the recycling of 1 ton of waste LED display screens. In this example, 1 ton of waste LED display screens contains 0.48 ton of plastic shells, 0.36 ton of PCBs and 0.16 ton of LED lamp beads.

[0063] In this example, the disassembly stage is manual disassembly, and energy consumption such as electricity is not considered;

[0064] Component resource recycling stage: PC plastic is recycled from plastic shells, and only copper is recycled from PCBs. The consumption of various resources and energy in the process is obtained from relevant process data; only rare metal gallium is recycled from LED lamp beads, and the consumption of various resources and energy in the process is obtained according to the specific recycling process. The data in this embodiment mainly comes from the literature (Zhang Anqi, Separation, Enrichment and Recovery of Rare and Precious Metals in Waste LED Packaging, Master's Thesis of Shanghai Second Polytechnic University, 2023) and environmental impact assessment reports (Pinglu Youying Gallium Industry Co., Ltd. Annual Recycling of 80 Tons of Gallium Metal Construction Project, Chongqing Shengming Recycling Resources Recycling Co., Ltd. Printed Circuit Board Recycling and Disposal Project, Sichuan Huazheng Resource Recycling Technology Co., Ltd. Annual Production of 6,000 Tons of Polycarbonate Granules Project);

[0065] Final disposal stage: The amount of wastewater, waste gas and solid waste generated during the disassembly and recycling of PC plastics from plastic shells, copper from PCBs and gallium from LED lamp beads is mainly derived from literature (Zhang Anqi, Separation, Enrichment and Recovery of Rare and Precious Metals in Waste LED Packages, Master's Thesis of Shanghai Second Polytechnic University, 2023) and environmental impact assessment reports (Pinglu Youying Gallium Industry Co., Ltd. Annual Recycling of 80 Tons of Gallium Metal Construction Project, Chongqing Shengming Recycling Resources Recycling Co., Ltd. Printed Circuit Board Recycling and Disposal Project, Sichuan Huazheng Resources Recycling Technology Co., Ltd. Annual Production of 6,000 Tons of Polycarbonate Granules Project). The recycling process is carried out according to the current mainstream treatment process, wastewater and waste gas are harmlessly disposed of, and solid waste is landfilled. In this embodiment, the consumption of various resources and energy in the final disposal process and the direct emission data to the environment are obtained from the professional database GaBi database;

[0066] Furthermore, in this example, the sources of carbon emission reduction in the recycling and reuse process of waste LED display screens are as follows:

[0067] The plastic shell is directly recycled, mainly through hot melting, extrusion, pelletizing and other processes. Hot melting and pelletizing are simple physical melting changes. The recycled PC plastic particles are recycled and produced. The carbon emission reduction comes from the replacement of recycled PC plastics for virgin PC plastic production.

[0068] PCBs recycling adopts a two-stage crushing + hydraulic shaker sorting process, which is followed by coarse crushing, fine crushing, hydraulic shaker sorting (classification collection and re-sorting), and finally dehydration and drying to produce recycled copper. The carbon emission reduction comes from the replacement of primary copper production with recycled copper.

[0069] The LED lamp beads first use the alkaline ball milling-water leaching process to obtain gallium leaching solution, and then use the resin adsorption method, including resin adsorption, saturated resin water washing, acid analysis, analysis solution post-treatment, electrolysis and refining processes, to recycle and produce regenerated gallium. The carbon emission reduction comes from the replacement of primary gallium production by regenerated gallium.

[0070] Based on the analysis results of the system boundary and inventory data, calculate the carbon emissions at each stage of recycling and reuse of waste LED display screens and the carbon emission reduction caused by replacing virgin materials with recycled materials at the component resource recycling stage;

[0071] In this example, the dismantling of waste LED displays is done manually, with zero electricity consumption. The carbon emissions during the dismantling phase are:

[0072] C d =E d ·F e =0kg CO 2 eq.

[0073] in:

[0074] C d ——Carbon emissions during dismantling, kg CO 2 eq.;

[0075] E d ——Power consumption during disassembly phase, kWh;

[0076] F e ——Electricity carbon dioxide emission factor, kg CO 2 eq. / kWh;

[0077] According to the recycling process, the material and energy consumption of each component recycling process and its corresponding carbon emission factors are selected from the database. The carbon emissions of the component recycling stage are:

[0078] C r =∑Mr n,x ·F x +∑Er n,i ·F i =827.04kg CO 2 eq.

[0079] in:

[0080] C r ——Carbon emissions during the component recycling phase, kg CO 2 eq.;

[0081] Mr n,x ——Consumption of material x in the resource recovery stage of component n, kg;

[0082] F x ——Carbon emission factor of substance x, kg CO 2 eq. / kg;

[0083] Er n,i——The consumption of energy i invested in the resource recovery stage of component n, kg or kWh;

[0084] F i ——Carbon emission factor of energy source x, kg CO 2 eq. / kg or kg CO 2 eq. / kWh;

[0085] According to the final disposal process, the carbon emission factors of different treatment processes are selected from the database. The carbon emissions in the final disposal stage are:

[0086] C h =∑Mh t ·F t =464.62kg CO 2 eq.

[0087] in:

[0088] C h ——Carbon emissions in the final disposal stage, kg CO 2 eq.;

[0089] Mh t ——The amount of waste t generated at the final disposal site, kg;

[0090] F t ——Carbon emission factor corresponding to the final disposal of waste t, kg CO 2 eq. / kg;

[0091] According to the resource recovery process, the carbon emission factors of the replacement of virgin materials with recycled materials are selected from the database. The carbon emission reduction generated by the replacement of virgin materials with recycled materials in the component recovery stage is:

[0092] CB n,m =MB n,m ·F n

[0093] in:

[0094] CB n,m ——Carbon emission reduction when recycled materials m replace virgin materials in the resource recovery stage of component n, kg CO 2 eq.;

[0095] MB n,m ——The amount of recycled material m generated in the resource recovery stage of component n, kg;

[0096] F n ——Carbon emission factor of recycled materials replacing virgin materials, kg CO 2 eq. / kg;

[0097] By calculating the formula:

[0098] In the recycling of plastic shells, the carbon emission reduction generated by replacing virgin PC plastic with recycled PC plastic is CB 塑料外壳,再生PC塑料 =1941.01kg CO 2 eq.;

[0099] In the recycling of PCBs, the carbon emission reduction generated by replacing primary copper with recycled copper is CB PCBs,再生铜 =144.11kg CO 2 eq.;

[0100] In the recycling of LED lamp beads, the carbon emission reduction CB of recycled gallium replacing primary gallium LED灯珠,再生镓 =9.97E-06kgCO 2 eq.

[0101] According to the above calculation results, the environmental benefit evaluation formula for recycling and reusing waste LED display screens is:

[0102] CB=∑CB n,m -(C d +C r +C h )=1941.01+144.11+0.00001-(0+827.04+

[0103] 464.62) = 793.46 kg CO 2 eq.

[0104] In this example, the carbon emission reduction benefit CB of recycling and reusing waste LED display screens is 793.46 kg CO 2 eq., its carbon emission reduction benefits are mainly contributed by the recycling of PC plastics in plastic shells, and the key influencing factor of carbon emissions is the use of natural gas in the process of recycling gallium from LED lamp beads.

[0105] Example 2:

[0106] This embodiment takes the carbon emission reduction benefit evaluation process of recycling 1 t of waste LED display screen, wherein the waste LED display screen is composed of a plastic shell, PCBs and LED lamp beads, and recovering PC plastic from the plastic shell, copper from PCBs and copper from LED lamp beads as an example to further illustrate the present invention.

[0107] In this example, the system boundary and functional unit of the waste LED display recycling process are the same as those in Example 1; the calculation of carbon emissions in the disassembly stage is the same as that in Example 1; in the resource recovery stage, the calculation of carbon emissions from plastic shells and PCBs is the same as that in Example 1; the calculation of carbon emission reductions from recycling recycled PC plastics in plastic shells and recycling recycled copper in PCBs to replace virgin materials is the same as that in Example 1;

[0108] The difference is that in this example, the LED lamp beads are recycled to produce recycled copper. The types and consumption of resources and energy in the recycling process have changed, and the carbon emissions in the resource recovery stage and the carbon emission reductions generated by replacing virgin materials need to be recalculated; in the final disposal stage, the amount and types of waste generated in the process of recycling and producing recycled copper have changed, and its carbon emissions need to be recalculated;

[0109] The LED lamp beads are crushed in two stages and separated by a hydraulic shaker, which is followed by coarse crushing, fine crushing, and water shaker separation (classification collection and re-separation), and finally dehydration and drying to produce recycled copper.

[0110] According to the recycling process, the material and energy consumption of each component recycling process and its corresponding carbon emission factors are selected from the database. The carbon emissions of the component recycling stage are:

[0111] C r =∑Mr n,x ·F x +∑Er n,i ·F i =53.89kg CO 2 eq.

[0112] According to the final disposal process, the carbon emission factors of different treatment processes are selected from the database. The carbon emissions in the final disposal stage are:

[0113] C h =∑Mh t ·F t =455.96kg CO 2 eq.

[0114] According to the process of recycling copper in LED lamp beads, the carbon emission factors of recycled copper replacing primary copper are selected from the database, and the carbon emission reduction CB of recycled copper replacing primary copper is LED灯珠,再生铜 =47.88kg CO 2 eq.

[0115] According to the above calculation results, the environmental benefit evaluation formula for recycling and reusing waste LED display screens is:

[0116] CB=∑CB n,m -(Cd +C r +C h )=1941.01+144.11+47.88-(0+53.89+

[0117] 455.96) = 1623.15 kg CO 2 eq.

[0118] In this example, the carbon emission reduction benefit CB of recycling and reusing waste LED display screens is 1623.15kg CO 2 eq., its carbon emission reduction benefits are mainly contributed by the recycling of PC plastics in plastic shells, and the key influencing factor of carbon emissions is the landfill disposal of solid waste in the final disposal stage.

[0119] It can be seen from the above description that the embodiment of the evaluation method realizes the evaluation of the carbon emission reduction benefits of recycling and reusing waste LED display screens, and at the same time can obtain the carbon emissions and emission reduction data of the recycling and reusing process for identifying the key influencing factors of carbon emissions and the main contribution links of carbon emission reduction benefits.

[0120] The above are only two embodiments of the present invention, which are intended to help understand the technical solution of the present invention and are not limited to the above specific implementation methods. For those skilled in the art, the present invention can be modified, substituted and improved without departing from the technical ideas and principles of the present invention. All improvements, equivalent substitutions, deformations, etc. of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens, characterized in that: The system boundary of the waste LED display recycling and reuse process includes the disassembly of the LED display, the resource recovery of components and the final disposal of waste. The carbon emissions and emission reductions of the whole process are evaluated based on different resource recovery and utilization strategies, and the overall carbon emission reduction benefits of waste LED display recycling and reuse under different strategies are evaluated. in: During the disassembly phase, waste LED displays are disassembled into three major components: housing, printed circuit boards (PCBs) and LED lamp beads. The carbon emissions mainly come from energy consumption. The resource recycling stage is divided into shell recycling, printed circuit board PCBs recycling and LED lamp bead recycling. Its carbon emissions mainly come from the consumption of various resources and energy in the resource recycling process, and the carbon emission reduction is generated by the replacement of virgin materials with recycled materials. The final disposal stage includes the final disposal of wastewater, waste gas and solid waste generated during the disassembly and recycling of housings, printed circuit boards PCBs and LED lamp beads. Its carbon emissions mainly come from the consumption of various resources and energy in the final disposal process and direct emissions to the environment; The overall carbon emission reduction benefit of recycling and reusing waste LED display screens is obtained by subtracting the carbon emissions in the disassembly stage, resource recovery stage and final disposal stage from the total carbon emission reduction produced by replacing virgin materials with recycled materials in the resource recovery stage.

2. The method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens according to claim 1 is characterized in that: The sources of carbon emission reduction under different resource recycling strategies are as follows: The shell is mainly made of metal or plastic, and its carbon emission reduction comes from the replacement of virgin metal and virgin plastic production with recycled metal materials or recycled plastics; The material composition of printed circuit boards (PCBs) is mainly copper and epoxy resin, and the carbon emission reduction comes from the replacement of primary copper production with recycled copper; LED lamp beads contain a variety of valuable metal materials and epoxy resins including copper, gallium, gold and silver. The carbon emission reduction from their resource recycling varies depending on the recycling strategy. The carbon emission reduction comes from the replacement of primary metal production with recycled copper, recycled gallium, recycled gold and recycled silver.

3. The method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens according to claim 2 is characterized in that: LED lamp beads produce different recycled metals based on different recycling strategies. Recycled metals including copper, gallium, gold and silver are recycled simultaneously or separately.

4. The method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens according to claim 1 is characterized in that: The calculation formula for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens is: CB=∑CB n,m -(C d +C r +C h ) in: CB represents the carbon emission reduction benefit of recycling and reusing waste LED display screens, kg CO2 eq.; CB n,m It represents the carbon emission reduction generated by replacing virgin material with recycled material m in the recycling stage of component n, kg CO2eq.; C d represents the carbon emission in the dismantling stage, kg CO2 eq.; C r It represents the carbon emission in the resource recovery stage, kg CO2 eq.; C h Represents carbon emissions in the final disposal stage, kg CO2 eq.

5. The method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens according to claim 4 is characterized in that: The calculation formula for carbon emissions at each stage of recycling and reuse of waste LED display screens is: (1) Carbon emissions during dismantling stage: C d =E d ·F e in: C d represents the carbon emission in the dismantling stage, kg CO2 eq.; E d Indicates the power consumption during the disassembly phase, kWh; F e represents the carbon dioxide emission factor for electricity, kg CO2 eq. / kWh; (2) Carbon emissions in the resource recovery stage: C r =∑Mr n,x ·F x +∑Er n,i ·F i =827.04kg CO2 eq. in: C r It represents the carbon emission in the resource recovery stage, kg CO2 eq.; Mr n,x Indicates the consumption of material x in the resource recovery stage of component n, kg; F x represents the carbon emission factor of the upstream production of substance x, kg CO2 eq. / kg; Er n,i Indicates the consumption of energy i invested in the resource recovery stage of component n, kg or kWh; F i represents the carbon emission factor of energy x, kg CO2 eq. / kg or kg CO2 eq. / kWh; (3) Carbon emissions in the final disposal stage: C h =∑Mh t ·F t in: C h represents the carbon emission in the final disposal stage, kg CO2 eq.; Mh t It indicates the amount of waste t generated at the final disposal site, kg; F t It represents the carbon emission factor corresponding to the final disposal of waste t, kg CO2 eq. / kg.

6. The method for evaluating the carbon emission reduction benefits of recycling and reusing waste LED display screens according to claim 4 is characterized in that: The calculation formula for carbon emission reduction generated by the output of recycled materials from the waste LED display screen components replacing virgin materials is: CB n,m =MB n,m ·F n in: CB n,m It represents the carbon emission reduction of component n when recycled material m replaces virgin material in the recycling stage, kg CO2eq.; MB n,m Indicates the amount of recycled material m generated during the recycling phase of component n, kg; F n Expresses the carbon upstream production emission factor for replacement of virgin material by recycled material n, kg CO2 eq. / kg.

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