一种新型立式螺旋筛网脱水机的研究

发布时间：2018-03-21 03:14

  本文选题：煤泥水　切入点：脱水机　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：在选煤厂中,细颗粒物料的脱水较为困难,通常采用的脱水机械主要有压滤机等脱水设备。压滤机的脱水效果相对较好,但由于其属于间断式工作方式,工作周期太长,工作效率低,不适用于连续处理煤泥水的状况。因此在连续给料的情况下如何提高脱水效率以获得细颗粒物料是一个亟待解决的技术问题。 针对此问题,根据生产需要,本文设计了一种脱水效率高的新型立式螺旋筛网脱水机。介绍了该机的具体结构组成、工作原理和技术特性。分析和设计了立式螺旋筛网脱水机关键部件的结构参数。 本脱水机包括沿竖直方向设置在壳体中的螺旋输送器,螺旋输送器的外侧套设有筛网,螺旋输送器和筛网均呈倒置的圆台状,筛网的下端呈敞口状,且筛网下端敞口处的外侧设有环状的分隔板；螺旋输送器的上转轴穿过筛网并伸出在壳体的顶部外侧,上转轴中穿设有送料管,且上转轴靠近螺旋输送器本体的一端设有喷料口,螺旋输送器的下转轴伸出在壳体的底部外侧,且下转轴处设置有支撑装置；所述上转轴或下转轴处还设置有驱动螺旋输送器转动的驱动装置；本脱水机经过过滤脱水和挤压脱水的双重脱水作用,进行对细颗粒物的脱水。 在充分考虑选煤厂实际应用的基础上,对本文对所设计的脱水机进行了fluent模拟和实验模拟。在螺旋筛网垂直沉降离心机流体模拟中,分别以清水以及不同比重物质为试验对象,模拟一定的转速下各个物质流场流速的分布以及粒子的轨迹分布,从而表征不同的流速下,不同比重粒子轨迹偏移量,来说明离心脱水机的脱水效果。在实验模拟中,本文是以煤水混合物为原料,进行了固液分离生产性能试验。研究了进料量、物料粒度、和不同浓度的煤泥水对煤水混合物脱水率、处理量和设备能耗等性能指标的影响,并对立式螺旋筛网脱水机的工艺参数进行了优化选择。试验结果表明：此螺旋筛网垂直沉降式脱水机运用螺旋给料挤压及重力脱水原理,具有良好的脱水效果,脱水率≤75%,生产量≥8t/h,设备能耗≤1.5kw·h/t,该设备固液分离方式性能优越,能较好满足煤泥水固液分离生产要求。
[Abstract]:In the coal preparation plant, the dehydration of fine particle materials is more difficult. The dehydration machines are mainly used in filter press and other dehydration equipment. The dehydration effect of filter press is relatively good, but because of its intermittent working mode, the working period is too long. The working efficiency is low and it is not suitable for the continuous treatment of coal slime water. Therefore, how to improve the dehydration efficiency in order to obtain fine particle material under the condition of continuous feed is a technical problem to be solved urgently. In order to solve this problem and according to the need of production, a new type of vertical screw-screen dehydrator with high dehydration efficiency is designed in this paper. The concrete structure of the machine is introduced. Working principle and technical characteristics. Structural parameters of key components of vertical spiral screen dehydrator are analyzed and designed. The dehydrator comprises a spiral conveyer arranged in the shell in the vertical direction, the outer sleeve of the spiral conveyor is provided with a screen net, the spiral conveyer and the screen net are in the shape of an inverted round platform, and the lower end of the screen net is open. The outer side of the lower end of the screen is provided with a annular separator; the upper shaft of the spiral conveyer passes through the screen net and protrudes outside the top of the shell, and the upper shaft is pierced with a feeding tube. One end of the upper shaft near the screw conveyor body is provided with a material injection port, the lower rotary shaft of the screw conveyer is protruded outside the bottom of the shell, and the lower rotary shaft is provided with a support device. The upper or lower rotating shaft is also provided with a driving device for driving the rotation of the screw conveyer; the dehydration machine carries out the dehydration of fine particles through the dual dehydration of filtration dehydration and extrusion dehydration. On the basis of fully considering the practical application of coal preparation plant, the fluent simulation and experimental simulation of the designed dehydrator are carried out in this paper. Taking clear water and different specific gravity substances as experimental objects, the velocity distribution and particle trajectory distribution of each material flow field at certain rotational speed are simulated, so as to characterize the trajectory migration of particles with different specific gravity at different velocities. In the experiment simulation, the production performance test of solid-liquid separation was carried out with the mixture of coal and water as raw material. And the effects of different concentrations of slime water on the dehydration rate, treatment capacity and equipment energy consumption of coal-water mixture, The experimental results show that the screw feed extrusion and gravity dehydration principle are applied to the vertical settling type dehydrator, which has a good dehydration effect. The dehydration rate 鈮，

本文编号：1642008