褐煤浮沉试验中煤样水分问题平庄局中心化验室史宏昆煤的浮沉试验，通常按国家标准ＧＢ４８７－８７进行。应用于褐煤时，经常出现结果超差的现象。根据多年实践，我们发现煤样水分是造成超差的一个重要因素。一、煤样水分对烟煤和无烟煤来说，在空气干燥状态下，不同密度... Lignite floating test coal sample moisture issues Pingzhuang Central Laboratory Shi Hongkun coal floating test, usually according to the national standard GB487-87. When used in lignite, the phenomenon of overcompensation of the result often occurs. Based on years of practice, we found that coal-like moisture is an important factor contributing to over-tolerance. First, the coal sample of bituminous coal and anthracite, in the air dry state, different density ...