煤质工业分析中坩埚湿度对浮力效应校正值的影响

Effect of Crucible Humidity on Correction Value of Buoyancy Effect

在煤质工业分析过程中,发现标煤灰分和挥发分测定结果准确度较低。进行原因分析,初步判断是由实验当天空气湿度大,测定灰分和挥发分时所用空白坩埚和测样坩埚储存条件不一致所造成的。通过对比实验对此结论进行验证,又从理论角度进行详细分析,发现空白坩埚和测样坩埚含水量不一致,对浮力效应校正值产生影响,从而影响测定结果的准确度,其影响趋势与实验测定值误差趋势相一致。针对这一问题制定相应措施,保证煤质工业分析结果准确可靠。

In the process of industrial analysis of coal quality,it is found that the accuracy of determination results of the standard coal ash and volatile matter are low.The reason is that the storage conditions of blank crucibles and sample crucibles used for ash and volatile matter determination are inconsistent because of the high air humidity by the time of the test.The conclusion is verified by comparative experiments and analyzed in detail from the theoretical point of view.It is found that the water content of blank crucible and sample crucible is not the same,which will affect the correction value of buoyancy effect,thus affecting the accuracy of measurement results.The trend of influence is consistent with the error trend of experimental measurement.In view of this problem,corresponding counter-measures are formulated to ensure the accuracy and reliability of the analysis results of coal industry.