输煤皮带机械化采样的精密度测定和偏倚试验

Manual sampling is affected by varieties of outside factors. As a result, the representative of collected coal samples degrades and apparent error exists. However, the mechanical sampling method avoids the disadvantages of manual sample collection. New coal sampler is developed according to site conditions of CHANGCUN coal cleaning plant at Lu an Environmental Energy Company. The determination of precision and bias experiments for the new coal sampler were carried out. The results show that the precision of the coal samples collected by the new coal sampler meet the requirements for precision and there is no bias for the coal sampling system.