Experimental study on pumping pressure of pipeline transportation of hazardous waste
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摘要: 蒸馏残渣与危废污泥混合物料通过管道输送到水泥回转窑焚烧是最优的协同处置危险废物的方法。物料是固-液两相流，黏性大，并混有铁皮、木材，固体泵长距离泵送是个难题。本文基于固体泵脉动式工作原理，通过分析管道压力的组成及产生机理，建立了基于稳态流动时的泵送压力数学模型及管道压力试验平台，管道输送含污泥质量分数为35 % 的混合物，每米水平摩阻损失为3.1 kPa，摩阻损失折算系数比为水平1 m∶垂直1 m∶水平90°弯头∶垂直90°弯头=1∶3∶16∶18。试验结果表明，配伍污泥质量分数为35 % ~40 % 的物料，泵送压力均随污泥质量分数的增加呈指数增加，与流速成线性关系，温差系数为1.5，重启系数为1.1，屈服应力系数为1.1。Abstract: Mixing hazardous waste such as distilled residue and hazardous waste sludge which are piped to cement rotary kilns for incineration is the optimal method of co-processing of hazardous waste in China. Solid pump can be pumped over long distances is a difficult problem because the mixture is highly viscous and belongs to solid-liquid two-phase flow mixed with iron and wood. Firstly, the composition and mechanism of pipeline pressure is studied based on the principle of pulsating solid pump. Secondly, a mathematical model of pumping pressure suitable for engineering applications combined with the temperature difference coefficient, restart coefficient and yield stress coefficient was established. Thirdly, the pipeline pressure test platform was build. The results show that the pressure loss is 3.1 kPa at 35 % sludge mass fraction and the loss conversion coefficient of horizontal 1 m∶vertical 1 m∶horizontal 90°elbow∶vertical 90°elbow is 1∶3∶16∶18. Fourthly, the recommended sludge mass fraction is 35 % ~40 % by the slump test. Finally, the experiment showed that the pumping pressure increased exponentially with the increase of sludge mass fraction and was linear with flow velocity. The temperature difference coefficient is 1.5. The restart coefficient is 1.1 and the yield stress coefficient is 1.1.
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Key words:
- hazardous waste /
- co-processing /
- cement-kiln /
- pipeline transportation /
- pumping pressure /
- slump /
- yield stress
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图 14 静置4 h重启与正常泵送压力曲线
Figure 14. Restart and normal transport pressure curve after 4 h set aside
图 15 活塞位置与压力的关系
Figure 15. Graph of the relationship between piston position and pressure
表 1 折算系数
Table 1. Conversion factor
污泥质量分数/% 参数 1 m位置 弯头 水平 垂直 水平90° 垂直90° 35 摩阻损失/kPa 3.10 9.35 48.49 54.9 折算系数1 1 3.01 15.64 17.71 40 摩阻损失/kPa 3.64 11.85 57.32 64.90 折算系数2 1 3.25 15.75 17.83 42 摩阻损失/kPa 4.44 13.54 70.28 78.32 折算系数3 1 3.05 15.83 17.64 45 摩阻损失/kPa 5.44 16.97 87.31 97.65 折算系数4 1 3.12 16.05 17.95 
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表 2 塌落度试验结果
Table 2. Slump results
污泥质量分数/% 30 35 40 45 蒸馏残渣质量分数/% 70 65 60 55 塌落度/mm 230 150 100 65 直径/mm 400 300 280 230 结论 大流动性物料 流动性物料 流动性物料 塑性物料
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表 3 不同速度下泵送压力参数
Table 3. Pumping pressure parameters at different speeds
固体泵排量/% 流速/(m·s-1) 泵送压力/kPa K1/kPa K2/kPa K3v/kPa ρgh/kPa 10 0.014 8 1 551.5 101.5 460 470 520 15 0.022 2 1 679.9 109.9 460 590 520 20 0.029 6 1 797.6 117.6 460 700 520 25 0.037 0 1 904.6 124.6 460 800 520 30 0.044 4 2 054.4 134.4 460 940 520 35 0.051 8 2 161.4 141.4 460 1 040 520 40 0.059 2 2 279.1 149.1 460 1 150 520 45 0.066 6 2 375.4 155.4 460 1 240 520 50 0.074 0 2 450.3 160.3 460 1 310 520 55 0.081 4 2 546.6 166.6 460 1 400 520 60 0.088 8 2 632.2 172.2 460 1 480 520 65 0.096 2 2 707.1 177.1 460 1 550 520 70 0.103 6 2 771.3 181.3 460 1 610 520 75 0.111 0 2 846.2 186.2 460 1 680 520 80 0.118 4 2 931.8 191.8 460 1 760 520
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表 4 重启与正常泵送压力对比
Table 4. Restart and normal delivery pressure comparison
停泵时间/h 重启泵送压力/kPa 正常泵送压力/kPa 2 1 689 1 590 4 1 721 1 576 6 2 530 1 583
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