元素分析仪是目前测定煤样中碳、氢、氮含量普遍采用的方法。针对煤中卤化物及硫化物易干扰碳、氢测定和对仪器管路造成腐蚀的问题,实验用氧化钙为吸收剂、五氧化二钒为催化剂与样品用锡囊包裹的方式,在样品燃烧阶段,有效解决卤素及硫化物对碳、氢测量的影响,同时提高了炉试剂使用寿命。实验结果表明,0.02g氧化钙为吸收剂、0.03g五氧化二钒催化剂,能有效解决煤质样品中总量约11%的氟、氯和硫对碳、氢测定的干扰;采用用锡囊代替锡箔包裹样品,能提高碳、氢、氮测定的稳定性;碳、氢、氮定量限为:0.0086%、0.062%、0.049%。方法应用于煤炭样品和标准品测定,测量精密度C<0.5%、H<2.5%、N<4.0%,标准样品测定结果在允许误差范围内,方法精密度和准确度较满意。

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.