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Abstract CO2 emission factor was the foundation of the calculation of CO2 emissions, and it was necessary that a large amount of samples at onsite cement production stages should be analyzed and studied for accurately calculating CO2 emission factor during the decomposition of carbonate minerals in calcinations for Chinese cement industry. Quantitative analysis was Londucted on calcium, magnesium, loss on ignition, carbonate and other chemical component in raw material, clinker, cement, limestone, coal and other samples from about 100 production lines in China. At the same time, it compared the differences between new suspension preheater kilns (NSP kilns) and shaft kilns. The results showed that CO2 emission factor calculated by raw material carbonate method was about 10kgCO2/tcl lower than clinker method. There were obvious differences within different types of cement kilns, for example, the emission factors of NSP kilns were in the range of 500~520kgCO2/tcl and shaft kilns were 480~500kgCO2/tcl. The majority of clinker contained a small amount of carbonate. The raw material carbonate method did not involve chemical composition of coal ash, and it could avoid the discrepancy of coal ash components. This implied that raw material carbonate method was relatively accurate, However it should be based on different types of kilns and carbonate decomposition rate.
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Received: 24 February 2014
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