Exploration of influence on buoyancy effect to determination of coal total moisture
LI Xinyang
LIU Honghao
Abstract：The total moisture in coal is a key part of coal quality analysis,which directly affects the low calorific value of coal,so how to further determine the value of total moisture accurately is crucial.According to the principle of buoyancy effect,the determination of total moisture in coal may be affected by buoyancy effect.In order to discuss the influence of buoyancy effect,an experiment was carried out to explore the influence of buoyancy effect on the determi-nation of total moisture in coal.Method B2(air drying)of GB/T 211-2017 was adopted,and the test was conducted with 10 bituminous coal samples to ensure the reliability of the test results.An empirical formula for the correction of buoyancy effects is applied,and the difference between the mass of the disk underneath at room temperature and in the thermal state(test temperature)is brought into the formula to derive a positive value for the total moisture.The experimental data show that the buoyancy effect has a certain influence on the measured value of total moisture of＜13 mm coal samples,and the influence value of the average value of two replicate measurements between parallel samples is between 0.1%and 0.4%.The study proves that the influence of buoyancy effect exists in the determination of total moisture,which provides an effective basis for further accurate determination of total moisture.
Keywords：buoyancy effecttotal moisture in coalmeasurement methodempirical correction formulatest conditionirrelevance
Publication Date：2025-11-30
Pages：5( 92-96 )