冻结站制冷系统自动控制设计

发布时间：2018-10-21 12:13

【摘要】：目前,煤炭这种不可再生能源日益趋于短缺,浅地层的煤炭开挖已经趋于枯竭,深层矿井的开凿成为现在开始研究和探索的焦点,因此,进一步加快了冻结施工技术在深厚冲积层中的广泛应用。但是,随着冻结施工时穿过深厚冲积层的厚度以及井筒深度的增加,对该项技术则提出了更高的要求。虽然深井冻结法凿井的基本理论,工程作业的规范要求,井壁构建的改善以及强化冻结等诸多方面都取得较大的进步,但是依然还有很多问题亟需解决,包括大量的能源浪费,较低的自动化控制水平,工程事故频繁等。本课题针对矿井井筒的冻结工程设计了冻结站制冷系统的自动控制,内容包括盐水循环系统中盐水泵的变频调速自动控制,氨循环系统中螺杆压缩机的自动优化控制和盐水流量与温度的模糊解耦控制。不仅实现了冻结站制冷系统的远程监控,提高了系统的自动化水平,而且还实现了盐水流量和温度的独立控制。最后结合理论与实测数据的计算对本文所设计的自动控制系统的节能情况作出了比较和分析,结果表明该控制系统具有较好的节能效果,运行成本也显著降低。利用盐水泵的变频调速自动控制法实现了盐水循环系统中盐水流量的自动控制,并结合实测数据的计算分析得出该方法具有较好的节能效果。通过对螺杆压缩机的自动优化控制,可以相对准确的控制压缩机的工作台数,从而减少电能消耗,降低系统运行的经济成本；压缩机的故障率下降,工作年限得到延长。采用盐水流量与温度的模糊解耦控制法,在无需对两者搭建精确数学模型的前提下,把两个具有强耦合的变量转变成了两个相互独立的控制变量,并通过MATLAB软件进行了仿真试验。在文章的结尾总结了本文所完成的工作,并结合系统设计中的不足,对未来的工作进行了展望。
[Abstract]:At present, coal, which is a non-renewable energy source, is becoming increasingly scarce, the coal excavation in the shallow strata has become depleted, and the excavation of deep mines has become the focus of research and exploration. Further accelerated the freezing construction technology in the deep alluvial layer wide application. However, with the increase of the thickness of deep alluvium and the depth of wellbore during freezing construction, higher requirements are put forward for this technique. Although great progress has been made in many aspects, such as the basic theory of freezing sinking in deep wells, the requirements of engineering specifications, the improvement of shaft lining construction and the intensification of freezing, there are still many problems that need to be solved, including a large amount of energy waste. Low level of automation control, frequent engineering accidents, etc. This paper designs the automatic control of refrigeration system of freezing station for freezing engineering of mine shaft, including the automatic control of frequency conversion speed regulation of salt water pump in salt water circulation system. Automatic optimization control of screw compressor and fuzzy decoupling control of salt water flow and temperature in ammonia circulation system. It not only realizes the remote monitoring of refrigeration system in freezing station and improves the automation level of the system, but also realizes the independent control of salt water flow and temperature. Finally, the energy saving situation of the automatic control system designed in this paper is compared and analyzed based on the calculation of the theory and the measured data. The results show that the control system has better energy saving effect and the running cost is significantly reduced. The automatic control of salt water flow in brine circulation system is realized by using the automatic control method of variable frequency speed regulation of salt water pump. Combining with the calculation and analysis of measured data, it is concluded that this method has better energy saving effect. Through the automatic optimization control of screw compressor, the number of compressor worktables can be controlled relatively accurately, thus reducing the power consumption, reducing the economic cost of system operation, decreasing the failure rate of the compressor, and prolonging the working life of the compressor. Using the fuzzy decoupling control method of salt water flow and temperature, two variables with strong coupling are transformed into two independent control variables without the need to build accurate mathematical models. The simulation test is carried out by MATLAB software. At the end of the paper, the work done in this paper is summarized, and the future work is prospected according to the shortcomings of the system design.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD265.3

【参考文献】