煤泥水处理加药点位置选择分析  

Analysis on position selection of dosing point in slime water treatment

作　　者：张磊 师亚文 康学刚 ZHANG Lei;SHI Yawen;KANG Xuegang(Daliuta Coal Preparation Plant,CHN Energy Shendong Coal Preparation Center,Shenmu 719315,China)

机构地区：[1]国家能源神东煤炭洗选中心大柳塔洗煤厂,陕西神木719315

出　　处：《洁净煤技术》2021年第6期207-211,共5页Clean Coal Technology

摘　　要：为避免煤泥水处理加药点选择不当,导致煤泥水与药剂仅靠自流混合不充分、不能充分发挥药效,以大柳塔选煤厂煤泥水处理为例,在分析选煤厂工艺流程、煤泥水矿物组成、阐明煤泥水与药剂充分混合重要性的基础上,利用流体流态判据雷诺数考察煤泥水流态。通过理论计算得出,煤泥水在回流缓冲池管道(明渠)中雷诺数在503~1246、浓缩池入料管道(有压)中雷诺数在714~1886,依据明渠和有压圆管中雷诺数湍流层流转变临界数,判定煤泥水回流缓冲池管道中煤泥水流态为湍流、浓缩池入料管道中煤泥水流态为层流,表明合理的加药点应布置在煤泥水回流缓冲池管道,浓缩池入料管道不利于药剂与煤泥水充分混合。最后根据生产实际指出,因合理加药点位置有限,应在缓冲池与浓缩池入料管道之间设置混合池或箱、增加管道混合器等,提供煤泥水与药剂充分混合的场所。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 503-1246,and the Reynolds number in the feed submerged pipeline of the concentration pool is between 714-1886.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 ta

关 键 词：加药点 煤泥水 雷诺数 搅拌 流态 

分 类 号：TD94[矿业工程—选矿]