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黄金科学技术 ›› 2024, Vol. 32 ›› Issue (1): 160-169.doi: 10.11872/j.issn.1005-2518.2024.01.122

• 采选技术与矿山管理 • 上一篇    下一篇

基于满管输送的充填管路优化研究

徐泽峰(),史秀志,黄仁东,丁文智,陈新()   

  1. 中南大学资源与安全工程学院,湖南 长沙 410083
  • 收稿日期:2023-08-24 修回日期:2023-11-20 出版日期:2024-02-29 发布日期:2024-03-22
  • 通讯作者: 陈新 E-mail:19307489912@163.com;chenxin_ck@csu.edu.cn
  • 作者简介:徐泽峰(1998-),男,河南焦作人,硕士研究生,从事采矿技术研究工作。19307489912@163.com
  • 基金资助:
    国家自然科学基金项目“稻草秸秆灰活化及其尾砂充填水化胶结机理”(52204165);湖南省自然科学基金项目“超细铅锌尾砂环境下微生物矿化沉积机制研究”(2021JJ40733)

Study on Filling Pipeline Optimization Based on Full Pipe Transportation

Zefeng XU(),Xiuzhi SHI,Rendong HUANG,Wenzhi DING,Xin CHEN()   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2023-08-24 Revised:2023-11-20 Online:2024-02-29 Published:2024-03-22
  • Contact: Xin CHEN E-mail:19307489912@163.com;chenxin_ck@csu.edu.cn

摘要:

满管输送可以延长充填管路的使用寿命,提高矿山充填作业效率。基于凡口铅锌矿新探明边缘矿体开采的充填需求,针对现有充填管线直径100 mm无法实现满管输送的问题,以地表管线SL1和地下管线L2-2为研究对象,开展充填管路优化研究。首先,运用理论计算,得出输送分级尾砂和细尾砂时,SL1的满管率分别为0.62和1.95,L2-2的满管率分别为0.72和2.26;其次,以最优满管率0.8为标准,通过公式推导,得出输送分级尾砂和细尾砂时SL1的理想水平管径分别为87 mm和155 mm,L2-2的理想水平管径分别为94 mm和168 mm;最后,利用CFD构建管道模型,运用Fluent软件进行变径满管流的数值模拟,通过对管道的压力及出口最大流速等进行对比分析得出,输送分级尾砂时减小管径可以增大满管率,且仍可自流输送;输送细尾砂时增大管径可以降低泵送压力。模拟结果证明此优化方案合理且具有很强的可行性。

关键词: 矿山充填, 满管输送, 管线优化, 数值模拟, 管道变径, Fluent软件

Abstract:

Mine filling technology is an important technical means for the construction of green mines,and full pipe transportation is a very important technology in the filling operation of underground metal mines.Full pipe transportation can minimize the contact area between filling slurry and air,reduce the impact on the filling pipeline,extend the service life of the filling pipeline,and improve the efficiency of mining filling operations.Aiming at the problem of the long distance between the newly discovered edge ore body and the filling station in Fankou lead-zinc mine and the high difficulty of transportation,the surface pipeline SL1 and underground pipeline L2-2 in the mine design plan were selected as the research objects to study the optimization plan of the filling pipeline in Fankou lead-zinc mine.Firstly,using theoretical formulas and based on the filling data of Fankou lead-zinc mine,the filling line and full pipe rate of SL1 pipeline and L2-2 pipeline were calculated when transporting graded tailings and fine tailings,respectively.The comparison was made using the optimal full pipe rate of 0.8 as the standard.The results show that both pipelines are in a state of under pipe when transporting graded tailings,and are in a state of over pipe when transporting fine tailings,which do not meet the optimal full pipe rate and need optimization.Secondly,through formula derivation and calculation,the ideal horizontal pipe diameter and the hydraulic slope after diameter change when transporting different slurry were obtained.Finally,numerical simulation was used to verify the calculation results of pipe diameter optimization.A pipeline model was constructed using CFD.The vertical pipeline was taken as 5 m,the horizontal pipeline was 23 m,the total length of the pipeline was 28 m,and the curvature radius at the bend of the pipeline was 0.55 m.The horizontal pipe diameter was changed.Fluent software was used to simulate the full pipe transportation before and after the diameter change,and key data such as flow velocity and full process resistance were obtained when transporting graded tailings and fine tailings.By comparing and analyzing the pressure of the pipeline and the maximum outlet flow rate,it is concluded that SL1 and L2-2 can transport graded tailings by gravity after optimizing the pipe diameter,while fine tailings can’t be transported by gravity.However,the pumping pressure is significantly reduced,so the calculation results are reasonable.Therefore,this optimization plan is relatively reasonable and has strong guiding significance for mining filling operations.

Key words: mine filling, full pipe transportation, pipeline optimization, numerical simulation, pipe diameter change, Fluent software

中图分类号: 

  • TD853

图1

充填管道磨损对比示意图"

图2

管道流速与压力损失关系曲线"

表1

充填料浆配比及其性质"

充填料浆有效粒径/μm灰砂比料浆质量浓度/%屈服剪切应力τ0/Pa黏性系数η/(Pa·S)料浆容重/(t·m-3)料浆塌落度ΔHs/cm
分级尾砂2501∶57616.180.101.9729.1
细尾砂71∶36629.090.241.6927.8

表2

充填管路充填倍线计算"

充填线路

管线

编号

地表高差/m总输送距离/m

充填

倍线

新充填站至7#新钻孔SL112845.60
0#钻孔线路L2-236823276.32

表3

充填管路理想变径及水力坡度"

充填管路充填料浆原水力坡度i1(mH2O/m)变径水力坡度i2(mH2O/m)理想管径/mm变径后流速/(m·s-1
SL1分级尾砂0.200.2587.004.68
细尾砂0.430.21155.001.47
L2-2分级尾砂0.200.2294.004.00
细尾砂0.430.19168.001.25

图3

SL1充填管道弯管流速分布云图(a)分级尾砂,水平管径为100 mm;(b)分级尾砂,水平管径为87 mm;(c)细尾砂,水平管径为100 mm;(d)细尾砂,水平管径为155 mm"

图4

SL1充填管道全压分布云图(a)分级尾砂,水平管径为100 mm;(b)分级尾砂,水平管径为87 mm;(c)细尾砂,水平管径为100 mm;(d)细尾砂,水平管径为155 mm"

表4

管线SL1变径输送模拟结果"

充填管路管径/mm充填料浆全程阻力/MPa自然压头/MPa出口最大流速/(m·s-1出口平均流速/(m·s-1
SL1100分级尾砂0.0140.0963.7963.234

垂直管径100

水平管径87

分级尾砂0.0190.0964.3593.717
100细尾砂0.1040.0833.8123.236

垂直管径100

水平管径155

细尾砂0.0970.0832.4132.086

图5

L2-2充填管道弯管流速分布云图(a)分级尾砂,水平管径为100 mm;(b)分级尾砂,水平管径为94 mm;(c)细尾砂,水平管径为100 mm;(d)细尾砂,水平管径为168 mm"

图6

L2-2充填管道全压分布云图(a)分级尾砂,水平管径为100 mm;(b)分级尾砂,水平管径为94 mm;(c)细尾砂,水平管径为100 mm;(d)细尾砂,水平管径为168 mm"

表5

管线L2-2变径输送模拟结果"

充填管路管径/mm充填料浆全程阻力/MPa自然压头/MPa出口最大流速/(m·s-1出口平均流速/(m·s-1
L2-2100分级尾砂0.0160.0963.7933.233
垂直管100;水平管94分级尾砂0.0180.0964.0313.440
100细尾砂0.1060.0833.8243.236
垂直管100;水平管168细尾砂0.0970.0832.2291.925
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