汽车用铝合金零部件的节能减排分析

基于生命周期评价的基础理论和技术框架,以铝合金轮毂为例,分析了铝合金零部件在生命周期中原材料生产、零部件生产及使用、回收再生等阶段的能耗和温室气体排放.在此基础上,定量分析了典型铝合金零部件在汽车上应用的节能减排效果,可知,应用1 kg铝可减少414～2 475 MJ的能耗和30～147 kg C02 eq的温室气体排放量;节能及减排量和钢铁部件质量与铝合金部件质量之比有关.     

CO2 emissions from typical cement plants in China

The objective is to know how the CO₂ emits and how much the CO₂ emits due to the cement manufacture in both direct and indirect ways with the increasing concerns about the global warming and the cement plants emitting huge CO₂. A precise method to calculate CO₂ emissions including three processes was established in this paper and a case study was provided. From the case of 23 typical plants in China, we can see the amount of CO₂ emissions at the right level. The summary of CO₂ emissions consists of emissions from raw materials, fuels and electricity. The average result of the 23 typical plants is 0.74 t CO₂ per ton clinker in this study. Therefore, CO₂ emissions from these typical cement plants were pictured and then measured. The creative point is that an approach provides a basic framework to identify various situations in different cement plants in China and other in the rest of the world. The framework would be useful in quantitatively evaluating CO₂ emissions for government to know precisely CO₂ emissions in the cement plants.