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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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 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 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 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 -
[1] 郭光明. 危险废物回转窑焚烧进料系统[G] //《环境工程》编委会. 工业建筑杂志社有限公司环境工程2018年全国学术年会论文集. 北京: 工业建筑杂志社有限公司, 2018. [2] Saak A W, Jennings H M, Shah S P.The influence of wall slip on yield stress and viscoelastic measurements of cement paste[J]. Cement and Concrete Research, 2001, 31(2): 205-212. doi: 10.1016/S0008-8846(00)00440-3 [3] Roussel N, Stefani C, Leroy R.From mini-cone test to Abrams cone test: measurement of cement-based materials yield stress using slump tests[J]. Cement and Concrete Research, 2005, 35(5): 817-822. doi: 10.1016/j.cemconres.2004.07.032 [4] 潘越. 高浓度粘稠物料输送管道压力分布及输送特性研究[D]. 北京: 中国矿业大学(北京), 2008. [5] 吴淼, 潘越, 赵国瑞, 等. 煤泥输送管道压力分布[J]. 煤炭学报, 2009, 34(2): 267-270. doi: 10.3321/j.issn:0253-9993.2009.02.026Wu Miao, Pan Yue, Zhao Guorui, et al. Pressure distribution of the coal slurry in the pipeline transportation[J]. Journal of China Coal Society, 2009, 34(2): 267-270. doi: 10.3321/j.issn:0253-9993.2009.02.026 [6] 郝雪弟, 张鹏程, 郭吉昌, 等. 煤泥管道输送压力损失特性的试验研究[J]. 煤炭工程, 2009, 41(12): 86-88. doi: 10.3969/j.issn.1671-0959.2009.12.031Hao Xuedi, Zhang Pengcheng, Guo Jichang, et al. Experimental study on pressure loss feature of coal slurry pipeline transportation[J]. Coal Engineering, 2009, 41(12): 86-88. doi: 10.3969/j.issn.1671-0959.2009.12.031 [7] Bauer E, de Sousa J G G, Guimaräes E A, et al. Study of the laboratory Vane test on mortars[J]. Building and Environment, 2007, 42(1): 86-92. doi: 10.1016/j.buildenv.2005.08.016 [8] Ky Gawu S, Fourie A B.Assessment of the modified slump test as a measure of the yield stress of high-density thickened tailings[J]. Canadian Geotechnical Journal, 2004, 41(1): 39-47. doi: 10.1139/t03-071 [9] 吴爱祥, 焦华喆, 王洪江, 等. 膏体尾矿屈服应力检测及其优化[J]. 中南大学学报: 自然科学版, 2013, 44(8): 3370-3376. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201308039.htmWu Aixiang, Jiao Huazhe, Wang Hongjiang, et al. Yield stress measurements and optimization of Paste tailings[J]. Journal of Central South University: Science and Technology, 2013, 44(8): 3370-3376. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201308039.htm [10] 郭光明, 郑晓雯, Pierre Jean Charnay. 管道输送危险废物固体泵的研制[J]. 起重运输机械, 2018(10): 101-103, 133. doi: 10.3969/j.issn.1001-0785.2018.10.026Guo Guangming, Zheng Xiaowen, Charnay P J. Development of solid pump for pipeline transportation of hazardous waste[J]. Hoisting and Conveying Machinery, 2018(10): 101-103, 133. doi: 10.3969/j.issn.1001-0785.2018.10.026 [11] 刘国明, 程卫民, 李振, 等. 基于剪切滑移的矿用泵送湿喷混凝土管道压力分布计算[J]. 山东科技大学学报: 自然科学版, 2017, 36(6): 66-72. https://www.cnki.com.cn/Article/CJFDTOTAL-SDKY201706010.htmLiu Guoming, Cheng Weimin, Li Zhen, et al. Pressure distribution calculation along pipes used for mining pumping wet shotcrete based on shear and slip[J]. Journal of Shandong University of Science and Technology: Natural Science, 2017, 36(6): 66-72. https://www.cnki.com.cn/Article/CJFDTOTAL-SDKY201706010.htm [12] Dzuy N Q, Boger D V.Direct yield stress measurement with the vane method[J]. Journal of Rheology, 1985, 29(3): 335-347. doi: 10.1122/1.549794 [13] 吴爱祥, 刘晓辉, 王洪江, 等. 考虑时变性的全尾膏体管输阻力计算[J]. 中国矿业大学学报, 2013, 42(5): 736-740. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD201305006.htmWu Aixiang, Liu Xiaohui, Wang Hongjiang, et al. Calculation of resistance in total tailings paste piping transportation based on time-varying behavior[J]. Journal of China University of Mining & Technology, 2013, 42(5): 736-740. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD201305006.htm [14] 韩文亮. 细颗粒浆体的应力松弛模型[J]. 泥沙研究, 1991(3): 87-92. https://www.cnki.com.cn/Article/CJFDTOTAL-NSYJ199103014.htmHan Wenliang. The stress relaxation model of fine particle slurry[J]. Journal of Sediment Research, 1991(3): 87-92. https://www.cnki.com.cn/Article/CJFDTOTAL-NSYJ199103014.htm [15] 李军世. 粘土蠕变-应力松弛耦合效应的数值探讨[J]. 岩土力学, 2001, 22(3): 294-297. doi: 10.3969/j.issn.1000-7598.2001.03.013Li Junshi. Numerical discussion on coupled effects of creep and stress relaxation of clay[J]. Rock and Soil Mechanics, 2001, 22(3): 294-297. doi: 10.3969/j.issn.1000-7598.2001.03.013 [16] 夏明耀, 孙逸明, 王大龄. 饱和软粘土固结、蠕变变形和应力松弛规律[J]. 同济大学学报, 1989, 17(3): 319-327. https://www.cnki.com.cn/Article/CJFDTOTAL-TJDZ198903008.htmXia Mingyao, Sun Yiming, Wang Daling. Law of consolidation creep strain and stress relaxation in saturated soft clay[J]. Journal of Tongji University, 1989, 17(3): 319-327. https://www.cnki.com.cn/Article/CJFDTOTAL-TJDZ198903008.htm [17] 吴爱祥, 刘晓辉, 王洪江, 等. 结构流充填料浆管道输送阻力特性[J]. 中南大学学报: 自然科学版, 2014, 45(12): 4325-4330. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201412031.htmWu Aixiang, Liu Xiaohui, Wang Hongjiang, et al. Resistance characteristics of structure fluid backfilling slurry in pipeline transport[J]. Journal of Central South University: Science and Technology, 2014, 45(12): 4325-4330. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201412031.htm [18] 罗超, 郭光明. 管道输送危险废物流变特性测试系统的研制[J]. 起重运输机械, 2019(6): 67-70. https://www.cnki.com.cn/Article/CJFDTOTAL-QZJJ201906028.htmLuo Chao, Guo Guangming. Development of rheological characteristics test system for pipeline transportation of hazardous wastes[J]. Hoisting and Conveying Machinery, 2019(6): 67-70. https://www.cnki.com.cn/Article/CJFDTOTAL-QZJJ201906028.htm [19] 郭光明, 张艳, 郑晓雯, 等. 危险废物管道输送压力监测预警系统的建立与性能分析[J]. 环境工程, 2019, 37(6): 136-140. https://www.cnki.com.cn/Article/CJFDTOTAL-HJGC201906026.htmGuo Guangming, Zhang Yan, Zheng Xiaowen, et al. A pipeline transportation pressure monitoring and warning system for hazardous waste and its performance analysis[J]. Environmental Engineering, 2019, 37(6): 136-140. https://www.cnki.com.cn/Article/CJFDTOTAL-HJGC201906026.htm [20] 沈慧明, 吴爱祥, 姜立春, 等. 全尾砂膏体小型圆柱塌落度检测[J]. 中南大学学报: 自然科学版, 2016, 47(1): 204-209. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201601028.htmShen Huiming, Wu Aixiang, Jiang Lichun, et al. Small cylindrical slump test for unclassified tailings paste[J]. Journal of Central South University: Science and Technology, 2016, 47(1): 204-209. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201601028.htm [21] 吴爱祥, 程海勇, 王贻明, 等. 考虑管壁滑移效应膏体管道的输送阻力特性[J]. 中国有色金属学报, 2016, 26(1): 180-187. https://www.cnki.com.cn/Article/CJFDTOTAL-ZYXZ201601021.htmWu Aixiang, Cheng Haiyong, Wang Yiming, et al. Transport resistance characteristic of paste pipeline considering effect of wall slip[J]. The Chinese Journal of Nonferrous Metals, 2016, 26(1): 180-187. https://www.cnki.com.cn/Article/CJFDTOTAL-ZYXZ201601021.htm