多功能集成乳化液箱设计及供液方案研究

发布时间：2018-05-23 22:53

本文选题：乳化液 + 过滤　；参考：《太原理工大学》2017年硕士论文

【摘要】：乳化液供液系统为液压支架供应高压乳化液,其合理、可靠、高效运转对采煤工作面的安全、可靠、高效生产有重要影响。当前,供液系统主要存在乳化液清洁度低,单台高压大流量乳化液泵无法满足高产高效工作面对乳化液的流量需求,供液方案不够经济、合理等问题。针对以上问题,本文设计了一套集成多级过滤及多泵联合供液功能的乳化液箱,并对供液过程及供液方案进行了研究。为了提高乳化液清洁度,在乳化液箱上集成了由片式滤网、吸液过滤器、高压过滤器、回液过滤器、污水过滤器等组成的多级过滤系统,对吸液过滤器及回液过滤器的自动反冲洗原理及滤芯参数进行了设计,并使用Solid Works建立了供液箱的三维模型。由于单泵难以满足高产高效工作面对乳化液的流量需求,本文设计了一款可用于实现多泵联合供液的集液器,并使用Fluent软件对单泵、双泵及三泵供液时集液器内的流场进行了仿真研究。仿真结果表明,同时供液的泵越多,乳化液通过集液器时的压降越大;双泵或三泵联合供液时,乳化液通过集液器时的压降主要发生在集液器出口段。为合理设计集液器出口段直径,本文对出口直径为38mm、45mm、50mm、60mm时集液器内部流场进行了分析。结果表明,随着集液器出口段直径增大,乳化液流过集液器的压力损失呈降低趋势,但当集液器出口直径大于50mm时,继续增大集液器出口直径,压力损失只有轻微的减小。因此,将集液器出液口尺寸设计为50mm较为合理。为解决供液方案不够合理的问题,本文通过数学建模及AMESim仿真对供液过程进行了研究,分析了不同的卸荷阀调定卸荷压力、调定卸荷压力与恢复压力差值、蓄能器容量及供液流量对支架不同动作时的供液过程的影响。研究结果表明,调定卸荷压力、调定卸荷压力与恢复压力差值、蓄能器容量对支架动作速度影响很小,但是增大调定卸荷压力与恢复压力差值或蓄能器容量可降低支架不用液时或者用液量小时卸荷阀重复卸荷、加载的频率;供液流量对支架升柱的快速性及初撑力的保障有很大影响,在不超过支架升柱实际流量需求时,供液流量越大,支架完成升柱并达到初撑力所需时间越短;但是若供液流量继续增大并超过支架升柱实际流量需求时,不但不能有效加快支架动作速度,反而会导致卸荷阀频繁动作;在单个支架降柱、推溜、移架时,由于流量需求较小及蓄能器的充放液作用,在一定范围内调节泵供液流量对支架动作快速性影响很小,但若供液流量过大同样会导致卸荷阀频繁动作。最后,讨论了当前主流供液方案存在的优缺点,提出了一种基于支架动作识别实现流量匹配的供液方案,并对基于卸荷阀的供液方案、变频恒压供液方案及基于支架动作识别实现流量匹配的供液方案等三种供液方案进行了仿真分析及仿真结果对比。结果表明,基于支架动作识别实现流量匹配的供液方案不但很好地结合了基于卸荷阀供液方案及变频恒压供液方案的优点,同时避免了基于卸荷阀供液方案及变频恒压供液方案的缺点,展示了基于支架动作识别实现流量匹配的供液方案的合理性及优势。
[Abstract]:The emulsion supply system provides high pressure emulsion for hydraulic support. It is reasonable and reliable. The efficient operation has important influence on the safety, reliability and high efficiency of the coal mining face. At present, the liquid system mainly exists the low cleanliness of the emulsion, and the single high pressure and large flow emulsion pump can not meet the flow requirement of the emulsion with high yield and high efficiency. The solution of liquid supply is not economical and reasonable. In view of the above problems, a set of emulsion boxes with integrated multi-stage filtration and multi pump combined fluid supply are designed, and the liquid supply process and solution are studied. In order to improve the cleanliness of the emulsion, a sheet filter, a suction filter and a high pressure filter are integrated on the emulsion box. The multi-stage filtration system, such as the liquid filter and the sewage filter, has been designed for the automatic backwashing principle and filter core parameters of the suction filter and the back liquid filter, and a three-dimensional model of the liquid supply box is established by using Solid Works. The fluid can be used to realize the fluid collector with multi pump combined fluid supply, and the flow field in the liquid collector of single pump, double pump and three pump is simulated with Fluent software. The simulation results show that the more pump of the liquid supply, the greater the pressure drop of the emulsion through the liquid collector; the pressure of the emulsion through the liquid collector when the double or three pump is combined. In order to rationally design the outlet section diameter of the liquid collector, the flow field in the liquid collector is analyzed in this paper for the outlet diameter of 38mm, 45mm, 50mm and 60mm. The results show that the pressure loss of the liquid collector is decreased with the increase of the diameter of the outlet section of the liquid collector, but the outlet diameter of the collector is greater than 5. At 0mm, the outlet diameter of the collector is increased and the pressure loss is only slightly reduced. Therefore, the design of the liquid outlet size of the liquid collector is more reasonable. In order to solve the problem that the solution is not reasonable enough, this paper studies the liquid supply process through mathematical modeling and AMESim simulation, and analyzes the pressure of different unloading valves to adjust and load the unloading pressure and adjust the unloading pressure. The difference between the unloading pressure and the recovery pressure, the accumulator capacity and the flow rate of the feed flow on the feeding process during the different movements of the support. The results show that the difference between the unloading pressure and the unloading pressure and the recovery pressure is adjusted, and the accumulator capacity has little effect on the operating speed of the support, but the difference between the pressure adjustment and the recovery pressure difference is increased. The accumulator capacity can reduce the load frequency and the loading frequency, which can greatly influence the speed of the lift column and the support of the initial bracing force. The longer the flow rate is, the shorter the time required for the support to complete the lifting column and reach the initial brace force. But if the flow rate continues to increase and exceeds the actual flow demand of the support column, it can not only speed up the movement speed of the support, but will lead to the frequent action of the unloading valve. In a certain range, the flow flow of the pump is adjusted to the support of the pump for the smaller flow demand and the charge and discharge action of the accumulator. The effect of the movement speediness is very small, but if the flow rate is too large, the discharge valve will be frequently operated. Finally, the advantages and disadvantages of the current main flow scheme are discussed, and a solution for the flow matching based on the support action recognition is put forward, and the scheme of the liquid supply based on the unloading valve, the scheme of the variable frequency constant pressure feeding and the support based on the support are also given. The simulation analysis and simulation results are compared between the three schemes of fluid supply scheme, such as the action recognition to realize the flow matching scheme. The results show that the flow matching scheme based on the support action recognition not only combines the advantages of the fluid supply scheme based on the unloading valve and the variable frequency constant pressure water supply scheme, but also avoids the unloading valve based on the unloading valve. The shortcomings of the liquid supply scheme and the variable frequency constant pressure liquid feeding scheme show the rationality and advantages of the flow matching liquid supply scheme based on the bracket action recognition.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD355.4

【参考文献】