CO2 emissions from the Chinese cement industry and methods to reduce them
中国水泥工业CO2产生机理及减排途径研究

According to the principles and characteristics of cement production,the emission factors of carbon dioxide were calculated to be 2.38 t·t-1 for burning coal and and 0.527 t·t-1 for burning lime materials.Amathematical model of CO2 emission in the cement industry was used to deduce the CO2 emissions load of the Chinese cement industry from 2001 to 2008.The results indicated that there is a linear relationship between the Chinese industrial emission of CO2 and the energy and resource consumption per unit product.CO2 emitted in the fuel burning and cement producing process were respectively responsible for 46% and 50% of total CO2 emissions by the cement industry.Indirect power loss occupied only 4% of total CO2 emissions.When the new suspension preheater(NSP) cement technique was used,CO2 emission decreased by 34% compared with that produced by the traditional technique.The CO2 emission of cement and admixture production decreased by 35% compared with Portland cement production.Compared with 2007,total Chinese cement outputs increased 2% in 2008,but there was only a 0.23% increase in CO2 emissions.The results indicate that techniques for energy saving and resource recycling have great influence on the reduction of CO2 emissions.