温度对无烟煤等温脱水影响的试验研究
Experimental Study on Influence of Temperature on Isothermal Dehydration of Anthracite
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摘要: 通过对外加平衡水无烟煤在等温干燥作用下水分迁移途径与变化规律的研究,建立了无烟煤脱水的数学模型,取0.2~0.25 mm粒径无烟煤,分别在75、105 ℃等条件下进行失水规律试验,得到不同温度条件下0.20~0.25 mm粒径煤样,临界含水率Xc1<含水率X<临界含水率Xc2阶段失水速率拟合曲线。试验所测同一粒径煤样,临界含水率Xc1<含水率X<临界含水率Xc2阶段失水速率v与温度T呈二次多项式关系,关系满足v=-0.000 3T2+0.062T-2.444 4,相关系数R2=0.902。由该公式可知同一粒径煤样90 ℃以下时提高温度可以显著加快煤样失水速度,当干燥温度提高到约90 ℃以上时为0.47 mm时,失水速度并未随温度的升高而显著增大。Abstract: In this paper, the mathematical model of anthracite dehydration was established through the study of the migration path and the change law of the anthracite coal under the effect of isothermal drying. The 0.2 to 0.25 mm anthracite coal was designed and the water loss test was carried out under the conditions of 75 ℃ and 105 ℃, respectively. The water loss rate fitting curve for coal sample with 0.20 to 0.25 mm particle diameter in Xc1<X< Xc2 stage under different temperature conditions is obtained. The experiment has measured the same size coal samples, and the water loss rate v and temperature T in Xc1<X<Xc2 stage have two polynomial relations, the relation satisfies v=-0.000 3T2+0.062T-2.444 4, the correlation coefficient is R2=0.902. The formula shows that the increase of temperature in the same size coal sample below 90 ℃ can significantly accelerate the coal sample losing water speed. When the drying temperature increased to about 90 ℃ above 0.47 mm, the rate of water loss did not increase significantly with the increase of temperature.
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Keywords:
- anthracite /
- isothermal dehydration /
- water loss rule /
- temperature /
- industrial analysis /
- gas desorption
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