【摘要】：目前,煤炭這種不可再生能源日益趨于短缺,淺地層的煤炭開挖已經(jīng)趨于枯竭,深層礦井的開鑿成為現(xiàn)在開始研究和探索的焦點,因此,進一步加快了凍結(jié)施工技術(shù)在深厚沖積層中的廣泛應(yīng)用。但是,隨著凍結(jié)施工時穿過深厚沖積層的厚度以及井筒深度的增加,對該項技術(shù)則提出了更高的要求。雖然深井凍結(jié)法鑿井的基本理論,工程作業(yè)的規(guī)范要求,井壁構(gòu)建的改善以及強化凍結(jié)等諸多方面都取得較大的進步,但是依然還有很多問題亟需解決,包括大量的能源浪費,較低的自動化控制水平,工程事故頻繁等。 本課題針對礦井井筒的凍結(jié)工程設(shè)計了凍結(jié)站制冷系統(tǒng)的自動控制,內(nèi)容包括鹽水循環(huán)系統(tǒng)中鹽水泵的變頻調(diào)速自動控制,氨循環(huán)系統(tǒng)中螺桿壓縮機的自動優(yōu)化控制和鹽水流量與溫度的模糊解耦控制。不僅實現(xiàn)了凍結(jié)站制冷系統(tǒng)的遠程監(jiān)控,提高了系統(tǒng)的自動化水平,而且還實現(xiàn)了鹽水流量和溫度的獨立控制。最后結(jié)合理論與實測數(shù)據(jù)的計算對本文所設(shè)計的自動控制系統(tǒng)的節(jié)能情況作出了比較和分析,結(jié)果表明該控制系統(tǒng)具有較好的節(jié)能效果,運行成本也顯著降低。 利用鹽水泵的變頻調(diào)速自動控制法實現(xiàn)了鹽水循環(huán)系統(tǒng)中鹽水流量的自動控制,并結(jié)合實測數(shù)據(jù)的計算分析得出該方法具有較好的節(jié)能效果。通過對螺桿壓縮機的自動優(yōu)化控制,可以相對準確的控制壓縮機的工作臺數(shù),從而減少電能消耗,降低系統(tǒng)運行的經(jīng)濟成本；壓縮機的故障率下降,工作年限得到延長。采用鹽水流量與溫度的模糊解耦控制法,在無需對兩者搭建精確數(shù)學(xué)模型的前提下,把兩個具有強耦合的變量轉(zhuǎn)變成了兩個相互獨立的控制變量,并通過MATLAB軟件進行了仿真試驗。在文章的結(jié)尾總結(jié)了本文所完成的工作,并結(jié)合系統(tǒng)設(shè)計中的不足,對未來的工作進行了展望。
[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.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD265.3

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