Research on the method of measuring carbon,hydrogen and nitrogen content in coal samples by element analyzer
The elemental analyzer is currently a commonly used method for determining carbon,hydrogen,and nitrogen in coal quality samples.In response to the problem that halides and sulfides in coal are prone to interfere with carbon and hydrogen measurement and cause corrosion to instrument pipelines,the experiment uses calcium oxide as an absorbent,vanadium pentoxide as a catalyst,and the sample is wrapped in a tin bag to effectively solve the influence of halides and sulfides on carbon and hydrogen measurement during the sample combustion stage,while improving the service life of the furnace reagent.The experimental results show that 0.02 g of calcium oxide as an absorbent and 0.03 g of vanadium pentoxide catalyst can effectively solve the interference of about 11%of total fluorine,chlorine,and sulfur in coal samples on carbon and hydrogen determination;Using tin bags instead of tin foil to wrap the sample can improve the stability of carbon,hydrogen,and nitrogen measurements;The quantitative limits for carbon,hydrogen,and nitrogen are 0.0086%,0.062%,and 0.049%.The method was applied to the determination of coal samples and standard samples,with measurement accuracies of C<0.5%,H<2.5%,and N<4.0%.The measurement results of standard samples were within the allowable error range,and the precision and accuracy of the method were satisfactory.
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