Tire LCA-3E Evaluation And Waste Disposal Program Design Study

Tire industry as a traditional manufacturing industry,the development of the industry in the field of energy saving and emission reduction is an important part of China to achieve sustainable development.On the one hand,tires from the initial production of raw materials and transportation of finished products to the disposal of waste tires will consume a lot of materials and energy,and then produce greenhouse gas emissions,on the other hand,because of the nonbiodegradable nature of waste tires,long-term open pile or discard will bring serious environmental pollution.Therefore,the construction of a life-cycle carbon emission,energy consumption and economic model of tires,comparative analysis of the environmental and economic impact of waste tire resource utilization methods,not only provides a basis for government and management decision-making,promote energy conservation and emission reduction work in the tire industry,but also has important significance for the establishment of a resource-saving and environment-friendly society.Firstly,this paper constructs a carbon emission and energy consumption model based on life cycle theory for the production,transportation,use and resource utilization stages of tires.If continuous low temperature thermal cracking is used to treat waste tires,it is evaluated that one ton of tires consumes a total of 1.01E+04 kg of carbon dioxide and 3.52E+05 MJ of primary energy during the whole life cycle.The environmental impact of the use phase accounts for the largest share of the total life cycle environmental impact,with carbon emissions and energy consumption accounting for 70.29% and 80.94%,respectively.The environmental impact of the production stage has the second largest share,with carbon black as the most critical carbon emission factor and synthetic rubber as the most critical energy consumption factor in the production stage.Secondly,based on the LCA-3E evaluation method,the advantages and disadvantages of the three thermal cracking recovery methods are compared and analyzed.Based on carbon emission analysis,continuous low-temperature thermal cracking recovery method is better than intermittent low-temperature thermal cracking method,and intermittent low-temperature thermal cracking recovery method is better than catalytic cracking method,and the carbon reduction benefit of 1t of waste tire continuous low-temperature cracking is 505 kg CO2-eq.Based on energy consumption perspective,catalytic cracking is better than continuous low-temperature thermal cracking,and continuous lowtemperature thermal cracking is better than intermittent low-temperature thermal cracking,and the energy reduction benefit of 1t of waste tire catalytic Based on the economic analysis,continuous low-temperature thermal cracking is better than catalytic cracking,and catalytic cracking is better than intermittent low-temperature thermal cracking.The weights of the three indicators of carbon reduction benefit,energy reduction benefit and economic benefit were determined by the AHP method,and the model of waste tire disposal solution evaluation was constructed by combining the evaluation method of TOPSIS.Finally,this paper uses the gray prediction model GM(1,1)to estimate the future waste tire generation in China,and on this basis uses the pinch point analysis to design the waste tire disposal program in China in 2025,and the results show that the existing recycling rate and recycling method cannot meet the demand for emission reduction,and the waste tire recycling rate reaches 70%and the continuous low temperature thermal cracking method accounts for 30%of the total recycling in order to achieve the emission reduction target.The results of this paper help the government to make waste tire management decisions with the goal of considering greenhouse gas emission reduction.