基于循环系统的膏体浓密机底流调控及其数学模型

发布时间：2018-03-17 13:29

本文选题：浓密机　切入点：底流　出处：《工程科学学报》2017年10期 　论文类型：期刊论文

【摘要】：为了保证浓密机在高料位下不压耙,一般通过增设循环系统使料浆始终处于活化状态,降低耙架运行阻力.然而,目前循环参数对底流的影响规律不明确,造成系统的设计及应用缺乏科学依据,为此开展了循环参数对底流的调控研究.分析循环系统的作用原理,将循环系统作用范围划分为两大区域,揭示循环参数对底流的调控机制,运用微积分原理对区域内的底流体积分数变化进行求解,最终建立浓密机底流调控数学模型.最后,利用该模型对底流循环实验参数进行验证.研究结果表明:开启底流循环后,底流体积分数开始降低并最终趋于稳定,底流体积分数差随着循环流量及循环高度增大而增大,体积分数变化幅度为0.7%~2.2%,稳定所需时间随流量及高度增加而减小.该理论模型完全吻合验证结果函数,为循环系统的设计及运行提供理论依据.
[Abstract]:In order to ensure that the thickener does not press the rake under the high material level, the slurry is always activated by adding the circulating system, and the running resistance of the rake frame is reduced. However, the influence of the circulation parameters on the bottom flow is not clear at present. Because of the lack of scientific basis for the design and application of the system, the study on the regulation and control of the circulation parameters to the bottom flow is carried out. The working principle of the circulatory system is analyzed, and the range of the circulatory system is divided into two regions. This paper reveals the regulation mechanism of circulation parameters to the bottom flow, solves the variation of the integral number of the bottom fluid in the region by using the calculus principle, and finally establishes the mathematical model of the bottom flow regulation of the thickener. Finally, the mathematical model of the bottom flow regulation of the thickener is established. The model is used to verify the experimental parameters of the bottom flow cycle. The results show that after the bottom flow cycle is opened, the integral number of the bottom fluid begins to decrease and eventually tends to stabilize, and the difference of the integral number of the bottom flow increases with the increase of the circulation flow rate and the cycle height. The change of volume fraction is 0.7 / 2.2, and the time required for stabilization decreases with the increase of flow rate and height. The theoretical model is in good agreement with the verification result function, which provides a theoretical basis for the design and operation of the circulatory system.
【作者单位】：北京科技大学土木与环境工程学院;金属矿山高效开采与安全教育部重点实验室;中国黄金协会;
【分类号】：TH69

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