Abstract: In view of the wide application of fast fuel element analysis method(non national standard method) in the power industry, by taking advantage of the robust statistics method, the carbon, hydrogen, nitrogen and other characteristic indices tested with the high-temperature combustion infrared thermal conductivity method areacquired for 22 provincial electricity coal testing centers The |z| value for the discrimination of test result outliers are also calculated. The standard comparison method is applied to determine the qualification of the outliers and assess scientifically and objectively the laboratory capabilities of evaluating to detect carbon, hydrogen and nitrogen. Meanwhile, the cause analysis on the suspicious and outlier values of each index is conducted. Finally, the improvement measures on fuel laboratory detection quality control are put forward to ensure the accuracy of C, H and N detection of coal by high-temperature combustion infrared thermal conductivity method.

Key words: Robust method, standard comparison, coal, carbon, hydrogen and nitrogen test, result evaluation