Analysis of influencing factors of carbon measurement uncertainty based on three-section furnace
The determination of carbon content in coal is of great significance to the study of coal classification.The determination of carbon content plays an important role in the determination of coal quality.The detection of carbon content usually uses the three-section furnace method.This method is simple and mature,but there are many influencing factors in the test process.In this study,the uncertainty of carbon content determined by the three-section furnace method was evaluated to determine the possible difference between the measured value and the real value.It can also effectively guide the improvement of the accuracy and precision of the test.In this experiment,low-rank coal was selected as a sample for testing.The source of uncertainty evaluation was determined by analyzing the influencing factors.After multiple measurements,the measured carbon content was 67.84％.When the source of uncertainty was analyzed by conventional selection,the expanded uncertainty U=0.00542％,the weight gain of the absorption tube was the main influencing factor;when the gas flow rate and environmental humidity are added to the black box model,the expanded uncertainty is 0.029％.After analysis,environmental humidity is the main influencing factor.
three-section furnace methodcarbon content in coal samplesgas flow rateenvironmental humidityevaluation of uncertainty
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