Investigation On The Life Cycle Assessment Of Originally Manufactured And Remanufactured Rotors Of Compressors

Currently,issues such as resources depletion,global warming,and ecological disruptionare increasingly outstanding in society.Apparently,remanufacturing has become one of the important ways to facilitate resources recycling and the circular economy development.However,to what extent remanufacturing can reserve energy and reduce resources consumption,and whether the ecological properties has differences in different time points remain to be unraveled in the development of remanufacturing industry.The present study regarded the rotor of PCL803 centrifugal compressor as a research object.With substantial amounts of data investigated in the compressor manufacturer,the Chinese life cycle database(CLCD),and ecoinvent database,the life cycle assessment(LCA)methodology was used to evaluate the environmental impacts of originally manufactured and remanufactured rotors of compressors.This study involving in the entire time-line adopted the temporal discounting based inventory analysis to compile the past environmental loads and used the system dynamics based LCA to predict the future environmental impacts.The detailed research contents are as follows:First of all,the systematic boundaries of originally manufactured and remanufactured rotors were identified and the investigated life cycle stages were specified.Combined with data of on-site survey and CLCD database,the life cycle inventory is compiled and then discounted by the temporal discounting model with first-order exponential decay.The results indicated that all the inventory materials involving in remanufacturing decrease significantly.The common atmospheric emissions such as CO2,SO2,H2 S,and CH4 decrease approximately67% and the CFC-11 about 90%.In the second place,according to the inventory analysis,environmental impact indicators such as photochemical ozone creation potential(POCP),global warming potential(GWP),ozone layer depletion potential(ODP),eutrophication potential(EP),primary energy demand(PED),and acidification potential(AP)are selected as indicators to evaluate the environmental impacts of originally manufactured and remanufactured rotors.The main environmental impacts and contributors are identified and the improvement methods are proposed accordingly.The results showed that the major environmental impacts are PED and GWP.In light of the selected six environmental indicators,environmental impact potentials ofremanufacturing are decreased by approximately 65%-70% compared with originally manufacturing.Additionally,the comprehensive environmental impacts of originally manufactured and remanufactured rotors are 1252.3 and 424.2,respectively.Finally,considering various influence factors,and regarding the investment of clean energy power construction as a starting point and the emission of unit electricity as a finishing point,a system dynamics model of emissions for unit power was established to stimulate the varying pattern of greenhouse gas.This varying pattern and the LCA model can be combined to determine the GWP comparison between originally manufactured and remanufactured rotors in 2011-2020.The results indicated that,with the development of power grid cleansing,GWP of the both two manufacturing modes decrease with time.Compared with the GWP in2011,GWP of originally manufactured and remanufactured rotors in 2020 would drop about8.1% and 7.7%,respectively.