Environmental Impact Assessment And Cost Analysis Of Remanufactured Engines Considering Emission Standards

At present,environmental pollution is becoming more and more serious,and resources and energy consumption are huge.All walks of life are seeking effective methods of "energy saving and emission reduction".The economic development mode of recycling renewable resources is becoming a global trend.Guided by the product full life cycle theory,the used engine is reprocessed,remanufactured,reassembled,and tested in accordance with the original new product quality requirements after dismantling,cleaning,testing and other process.Engine remanufacturing is considered "energy saving and emission reduction",but the restrictions on new engines imposed by automobile emission standards also affect remanufactured engines.Based on life cycle assessment(LCA)theory,this paper first established the "repair-type" remanufactured engine’s LCA model,evaluated its impact on the environment during the life cycle stage,and study the effect of vehicle emission standards for its use;then two upgrade remanufacturing modes are proposed,this paper established the two kind of remanufactured engines’ LCA model,study its emission standard adaptability;finally,based on the life cycle cost evaluation(LCC)method,this research analyzed the life cycle cost of "repair-type","oil to natural gas" and " installation-type" remanufactured engines.This article first uses the life cycle assessment method to establish the LCA model of the "repair-type" remanufactured engine,evaluates its impact on the environment during the life cycle stage,compares the environmental impact of the "repair-type" remanufactured engine used in different emission standard scenarios,and discusses the standards’ adaptability of "repair-type" remanufactured engines used in cross-standard stages.The analysis results show:in the original emission standard stage,the use of "repair-type" remanufactured engines has less environmental impact;under the cross-standard stage scenario,the use of "repair-type" remanufactured engines has a greater environmental impact;and the more cross-standard stages,the greater the environmental impact.Then,considering the shortcomings of "repair-type" remanufactured engine used in cross-standard scenarios,two solutions are proposed: "oil to natural gas" remanufactured engine and "installation-type" remanufactured engine.Use life cycle assessment methods to establish LCA models for "oil to natural gas" remanufactured engine and "installation-type" remanufactured engine,evaluate the resource consumption and environmental impact of these two types of remanufactured engines,and discuss their respective standard adaptability,advantages and disadvantages.The analysis results show that the “oil to natural gas”remanufactured engine can meet the emission standard limit value,can be used in cross-standards stages and reduce the environmental impact,but the technology is complicated;"installation-type" remanufactured engine can meet emission standard limit value,can be used in cross-standard stages,and the skill is simple,but using exhaust gas treatment devices has caused a surge in ozone depletion potential(ODP),which requires continuous development of more efficient after-treatment devices.Finally,based on the life cycle cost analysis method,considering conventional cost,environmental cost and total cost,this paper comprehensively analyze and compare the life cycle costs of "repair-type","oil to natural gas",and "installation-type" remanufactured engines.The results show that the conventional cost of the "repair-type" remanufactured engine is the highest,the environmental cost is the highest,and the total cost is the highest;compared with the "repair-type" remanufactured engine,the conventional cost of the "installation-type" remanufactured engine is increased,but the environmental cost in the use phase is reduced,and total cost is reduced;"oil to natural gas" remanufactured engine has the lowest conventional cost,lowest environmental cost,and lowest total cost.