摘要
浓缩机中煤泥水沉积界面是描述浓缩机工作状态重要技术参数,对指导煤泥水絮凝剂加药量等参数控制具有重要意义。笔者利用翻转式人工采样器对神东洗选中心煤制油选煤厂浓缩机中煤泥的浓度分布和粒度分布规律进行研究,沿着径向等距选取100~13100 mm范围内的14个点、深度100~4900 mm范围内的16个位置,共设置195个采样点。研究结果表明,浓缩机中从表层往下的煤泥水浓度逐渐升高,3600 mm以下的煤泥浓度急剧升高且出现波动,煤泥水沿浓缩机径向水平分布的浓度变化与采样半径无关。利用超声探测原理设计制造了超声波测试平台,设定超声工作频率为66 MHz,由于超声波在煤泥水中传播时受煤泥水中煤泥的影响而出现衰减现象,以此来检测浓缩机中不同深度的煤泥水浓度,从而计算浓缩机中煤泥水沉积界面深度。试验结果表明,煤泥水浓度与超声波发射接收频率差具有良好的线性关系。对浓缩机生产状态和停产状态时的清水层高度进行测试,并与人工检测的清水层高度结果进行对比,结果表明,超声波测试平台检测指标与人工测试指标差在46~57 mm,可取代人工测试,实现了浓缩机沉积界面参数的自动化检测,为后续煤泥水絮凝沉降过程的自动化控制提供重要依据。
The coal slime water deposition interface is an important technical parameter to describe the working state of the thickener.It is of great significance to guide the parameter control of slurry flocculant dosage.In this paper,the object is the rule of the distribution of coal slime concentration and particle size in the thickener of shendong coal preparation center coal preparation oil preparation plant.14 points from 100 mm to 13100 mm and 16 positions from 100 mm to 4900 mm were selected along radial equidistance,and 195 sampling points were set altogether.The results show that the concentration of coal slime water in the thickener is higher as it goes down from the surface,the concentration of coal slime below 3600 mm increases sharply and there is fluctuation.The concentration of coal slime water along the radial horizontal distribution of the thickener changes independently of the sampling radius.Ultrasonic testing platform is designed and manufactured by ultrasonic detection principle,the operating frequency of ultrasonic is set as 66 MHz.When ultrasonic wave propagates in coal slime water,the ultrasonic wave would attenuate affected by coal slime in coal slime water.This phenomenon was used to detect the concentration of coal slime water at different depths in the thickener,thus the depth of coal slime water deposition interface in the thickener was calculated.The results show that there is a good linear relationship between the concentration of coal slime water and the difference of ultrasonic transmitting and receiving frequency.The height of fresh water layer during the production and shutdown of the thickener was tested respectively,and the results were compared with the artificial detection of the height of the fresh water layer.The experiment shows that the index difference value between ultrasonic testing platform and manual testing is 46-57mm.It can replace manual test and realize automatic detection of deposition interface parameters of thickener.This test platform provides an important basis for
作者
朱子祺
吕一波
ZHU Ziqi;LYU Yibo(CHN Energy Shendong Coal Preparation Center,Yulin 719315,China;School of Mining Engineering,HeilongjiangUniversity of Science&Technology,Harbin 150022,China)
出处
《洁净煤技术》
CAS
2019年第5期162-166,共5页
Clean Coal Technology
关键词
煤泥水
沉积界面
超声波
沉降
coal slime water
deposition interface
ultrasonic
sedimentation
