ZHANG Lei;SHI Yawen;KANG Xuegang;

• 1:Daliuta Coal Preparation Plant
• 2:CHN Energy Shendong Coal Preparation Center

Abstract：

In order to avoid no mixing equipment for slime water and reagent due toimproper selection of dosing point location, it is not sufficient to mix slime water and chemicals by gravity flow, which can not give full play to the efficacy. Aiming at the problem that the location of dosing point is more arbitrary, taking the slime water treatment of Daliuta Coal Preparation Plant as an example, the process flow of coal preparation plant was analyzed, the causes of difficult settlement of slime water, the importance of fully mixing slime water and chemicals was clarified. The flow pattern of slime water in the backflow buffer pool and concentration pool was investigated by using the fluid flow state criterion Reynolds number. Through theoretical calculation, the Reynolds number of slime water in the open channel pipeline of the backflow buffer pool is between 503-1 246,and the Reynolds number in the feed submerged pipeline of the concentration pool is between 714-1 886. According to the critical number of Reynolds number turbulent laminar flow transition in open channel and submerged circular pipe, the flow pattern of slime water in the open channel pipeline of slime water reflux buffer pool is turbulent, and the flow state of slime water in the submerged pipeline of concentration pool is laminar flow. The mixing and interference of various parts of slime water in turbulent flow state is conducive to mixing with chemicals, but the laminar flow state is not conducive to the mixing of slime water and chemicals. The position of dosing point should be that the flow pattern of slime water is turbulent flow, but not laminar flow. Finally, it is pointed out that the reasonable position of dosing point is limited, so a mixing tank or box should be set up between the buffer tank and the concentration tank, and the pipeline mixer can also be added to provide a place for the full mixing of coal slime water and chemicals, but the new facilities are required to not only fully mix the slime water agent, but also provide stable feeding for the concentration tank.

Key Words： dosing point;slime water;Reynolds number;mixing;flow state

Abstract:

Keywords:

Foundation:

Authors: ZHANG Lei;SHI Yawen;KANG Xuegang;

References：

• [1] 白龙，李文利，刘建东.石圪台选煤厂药剂添加系统的改造与优化[J].内蒙古煤炭经济，2015(2):153,173.BAI Long,LI Wenli,LIU Jiandong.Transformation and optimization of reagent addition system in Shigetai Coal Preparation Plant[J].Inner Mongolia Coal Economy,2015(2):153,173.
• [2] 田华雷，王进荣.布尔台选煤厂煤泥水系统药剂制度的分析与研究[J].科技创新与应用，2014(17):10-11.TIAN Hualei,WANG Jinrong.Analysis and research on reagent system of slime water system in Buertai Coal Preparation Plant[J].Scientific and Technological Innovation and Application,2014(17):10-11.
• [3] 陶亚东，赵厚增，樊玉萍，等.布尔台选煤厂煤泥水系统药剂制度优化及应用研究[J].选煤技术，2013(3):29-31.TAO Yadong,ZHAO Houzeng,FAN Yuping,et al.Study on optimization and application of reagent system in slime water system of Buertai Coal Preparation Plant[J].Coal Preparation Technology,2013(3):29-31.
• [4] 何创库，张俊杰，孙国兴.神东煤制油选煤厂煤泥水系统优化实践[J].内蒙古煤炭经济，2017(16):56-57.HE Chuangku,ZHANG Junjie,SUN Guoxing.Optimization practice of slime water system in Shendong Coal Preparation Plant[J].Inner Mongolia Coal Economy,2017(16):56-57.
• [5] 冯莉，刘炯天，张明青，等.煤泥水沉降特性的影响因素分析[J].中国矿业大学学报，2010,39(5):671-675.FENG Li,LIU Jiongtian,ZHANG Mingqing,et al.Analysis on influencing factors of slime water settlement characteristics[J].Journal of China University of Mining and Technology,2010,39(5):671-675.
• [6] 段杨敏.含蒙脱石煤泥水的沉降特性研究[D].徐州：中国矿业大学，2016.
• [7] 闵凡飞，张明旭，朱金波.高泥化煤泥水沉降特性及凝聚剂作用机理研究[J].矿冶工程，2011,31(4):55-58,62.MIN Fanfei,ZHANG Mingxu,ZHU Jinbo.Study on sedimentation characteristics and coagulant action mechanism of high slime coal slurry[J].Mining and Metallurgy Engineering,2011,31(4):55-58,62.
• [8] 程万里，张秀梅，邓政斌，等.基于EDLVO理论的浮选药剂对煤泥颗粒间的相互作用[J].煤炭学报，2020,45(10):3563-3572.CHENG Wanli,ZHANG Xiumei,DENG Zhengbin,et al.Interaction between flotation reagent and coal slime particles based on edlvo theory[J].Journal of China Coal Society,2020,45(10):3563-3572.
• [9] 贺斌，董宪姝，樊玉萍，等.基于EDLVO理论的煤泥水沉降机理的研究[J].煤炭技术，2014,33(4):249-251.HE Bin,DONG Xianshu,FAN Yuping,et al.Study on coal slime water settlement mechanism based on EDLVO theory[J].Coal Technology,2014,33(4):249-251.
• [10] 李桂春，闫晓慧，李明明.PAC作用下煤泥水絮凝沉降的EDLVO分析[J].黑龙江科技大学学报，2020,30(1):45-49.LI Guichun,YAN Xiaohui,LI Mingming.EDLVO analysis of coal slurry flocculation settlement under PAC[J].Journal of Heilongjiang University of Science and Technology,2020,30(1):45-49.
• [11] 赵小川，胡文韬，王怀法.搅拌对煤泥水絮团结构形态影响的试验研究[J].选煤技术，2008(6):7-11,2.ZHAO Xiaochuan,HU Wentao,WANG huaifa.Experimental study on the effect of mixing on the structure and morphology of coal slime water flocs[J].Coal Preparation Technology,2008(6):7-11,2.
• [12] 吕淑湛，赵世永，李振.煤泥水絮凝沉降效果影响因素的试验研究[C]//2013年全国选煤技术交流会论文集.唐山：中国煤炭学会选煤专业委员会，2013:34-38.
• [13] 沈宁.煤泥水絮凝沉降效果影响因素研究[J].选煤技术，2018(3):20-25.SHEN Ning.Study on influencing factors of flocculation and sedimentation effect of slime water[J].Coal Preparation Technology,2018(3):20-25.
• [14] 王贞涛.流体力学与流体机械[M].北京：机械工业出版社，2015:67-95.
• [15] 李殿英.煤泥悬浮液流变性能研究及絮凝剂对其影响[J].煤炭与化工，2020,43(5):115-118,124.LI Dianying.Rheological properties of coal slurry suspension and the effect of flocculants on it[J].Coal and Chemical Industry,2020,43(5):115-118,124.
• [16] 卢安民.泥化条件下煤泥沉降试验与研究[J].煤炭工程，2005(9):64-67.LU Anmin.Experiment and research on slime settlement under argillization condition[J].Coal Engineering,2005(9):64-67.