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Study on grading degradation of coarse coal slurry pipeline transportation and its influence
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摘要: 针对粗颗粒煤浆输送中颗粒级配降级预测研究不足的问题，采用试验研究和理论分析法，给出了输送30、40、50和60 min时煤浆中各颗粒粒级的质量百分数、黏度和水力坡度值，提出用磨矿理论研究粗颗粒煤浆管道输煤过程的构想， 据此给出了破碎率函数和磨矿平衡方程的求解方法。研究表明，煤浆输送30和50 min时颗粒级配的预测值与实测值最大偏差不大于12.53%。随着粗煤浆体输送时间的延长，煤浆相对黏度逐渐增大，主要原因是由于2.0 mm以上粗颗粒的颗粒细化，增加了0.074 mm以下的细颗粒含量。颗粒级配降级导致水力坡度降低主要是由于粗颗粒细化导致沉降速度降低及与管道底部接触的粗颗粒有所减少的原因。Abstract: In view of the lack of research on the prediction of particle gradation degradation in the transportation of coarse particle coal slurry, by using the experimental research method and theoretical analysis method, the mass percentage, viscosity and hydraulic gradient of each particle size in coal slurry at 30, 40, 50 and 60 min are given out. The idea of using grinding theory to study the coal conveying process of coarse coal slurry pipeline is put forward. On this basis, the solution methods of breakage rate function and grinding balance equation are given. The results of data comparison and analysis show that the maximum deviation between the predicted value and the measured value of particle gradation is no more than 12.53% when the coal slurry is transported for 30 and 50 min. With the extension of conveying time of coarse coal slurry, the relative viscosity of coal slurry gradually increases, mainly due to the refinement of coarse particles above 2.0 mm and the increase of particle content below 0.074 mm. The reduction of hydraulic gradient caused by particle grading degradation is mainly due to the reduction of settlement velocity caused by coarse particle refinement and the reduction of the probability of particle contact with the bottom of the pipeline.
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图 2 实测的各粒级质量百分数随时间变化曲线
Figure 2. Variation curve of measured mass percentage of each particle size with time
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图 3 0~1 440 min时间段内各粒级质量百分数与时间关系
Figure 3. Relationship between mass percentage of each particle size and time in the period of 0-1 440 min
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图 4 颗粒级配降级对水力坡度和中值粒径的影响
Figure 4. Effect of particle gradation degradation on hydraulic gradient and median particle size
表 1 初始颗粒粒度分布
Table 1 Initial particle size distribution
粒度区间/mm 质量百分数/% 10.000~29.400 10.10 5.000~10.000 13.50 2.000~5.000 20.00 0.500~2.000 21.40 0.074~0.500 15.00 <0.074 20.00 
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表 2 煤浆输送40和60 min时颗粒级配构成
Table 2 Composition of particle gradation when conveying for 40 min and 60 min
粒级区间/mm 40 min时质量百分数/% 60 min时质量百分数/% 10.000~29.400 7.60 5.22 5.000~10.000 13.28 13.15 2.000~5.000 18.54 18.23 0.500~2.000 23.47 23.67 0.074~0.500 17.02 17.73 <0.074 20.09 22.00
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表 3 不同输送时刻破碎率函数计算值
Table 3 Calculated values of crushing rate function at different conveying times
输送时间/min S 1/min−1 S 2/min−1 S3/min−1 S 4/min−1 S 5/min−1 40 0.005 818 0.002 061 0.001 720 0.000 425 0.000 033 60 0.008 400 0.004 061 0.003 320 0.001 230 0.000 015 平均 0.007 109 0.003 061 0.002 520 0.000 825 0.000 028
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表 4 不同时刻颗粒级配预测值和实测值对比
Table 4 Comparison of predicted and measured values of particle gradation at different times
粒级区间/mm 不同时刻各粒级分布/% 相对误差/ % t=0 t=30 min (计算) t=30 min
(实测)t=50 min
(计算)t=50 min
(实测)t=30 min t=50 min 10.000~29.400 10.10 8.17 9.34 7.08 6.44 −12.53 9.94 5.000~10.000 13.50 13.37 13.43 13.17 13.21 −0.44 −0.30 2.000~5.000 20.00 18.90 18.79 18.19 18.34 0.59 −0.82 0.500~2,000 21.40 22.99 22.41 23.93 23.52 2.59 1.74 0.074~0.500 15.00 16.52 16.01 17.51 17.30 3.19 1.21 <0.074 20.00 20.07 20.02 20.11 21.21 0.25 −5.19
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表 5 煤浆级配降级对黏度影响
Table 5 Effect of coal slurry gradation degradation on viscosity
输送
时间/min粒径小于0.074 mm
的质量百分数/%实测相对黏度 计算相对黏度 相对
误差/%0 20.00 1.421 1.309 −7.88 30 20.02 1.213 1.315 8.41 40 20.09 1.345 1.322 −1.71 50 21.21 1.273 1.350 6.05 60 22.00 1.398 1.373 −1.82
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