渐变格栅式煤泥絮凝装置设计及应用研究  

Design of gradual change grid flocculation device and its application in flocculation of slime water

作　　者：乔治忠[1] 郝彦东 宋晓利 林喆[2] QIAO Zhi-zhong;HAO Yan-dong;SONG Xiao-li;LIN Zhe(Shenhua Zhungeer Energy Co.,Ltd.,Ordos 010300,China;School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]神华准格尔能源有限责任公司,内蒙古鄂尔多斯010300 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《煤炭工程》2021年第5期168-172,共5页Coal Engineering

摘　　要：絮凝过程中絮体的成长对水力条件有动态的需求。根据自保守混凝动力学理论,提出了渐变格栅式絮凝装置的设计方法,并以300s-1为初始速度梯度,设计和加工了实体装置。在优化的药剂制度下,使用该装置在不同进料流量下进行了煤泥水的絮凝沉降试验,结果表明,2.28L/min时絮体的粒径(0.98mm)和上清液的浊度(18NTU)均为最佳,该流量和设计时取值2.4L/min接近,表明设计方法合理可靠。与直管絮凝和量筒翻转絮凝沉降试验相比,渐变格栅式絮凝装置絮凝沉降后煤泥水上清液浊度可降低12NTU,表明该装置中逐步降低的水力速度梯度在絮凝煤泥水时符合絮凝动力学要求,具备优势。The growth of flocs in flocculation process has a dynamic demand for hydraulic conditions.According to the theory of self-conservative coagulation kinetics,the design method of gradual change grid flocculation device is proposed,and a gradual change grid flocculation device is designed and processed with 300 s-1 as the initial velocity gradient.Under the optimized reagent condition,the experiments of flocculation and sedimentation of slime water in the designed device were carried out at the feed flowrate of 1.65,2.28,2.91 and 3.54 L/min.The results show that the floc size and the turbidity of supernatant are the best at 2.28 L/min,and the flow rate is close to the design value of 2.4 L/min,which shows that the design method is reasonable and reliable.Compared with the straight pipe flocculation and measuring cylinder turnover method flocculation sedimentation experiments,the turbidity of supernatant of slime water can be reduced by 12 NTU after flocculation sedimentation by gradual grid flocculation device,which indicates that the gradually reduced hydraulic velocity gradient in the device meets the requirements of flocculation kinetics and has advantages.

关 键 词：渐变格栅 煤泥水 絮凝 絮凝动力学 

分 类 号：TD94[矿业工程—选矿]