【摘要】：乳化液被譽為井下支護設備的血液,在煤礦中有著重要作用。乳化液濃度是影響其使用性能的關鍵因素,因此需要對配制乳化液的濃度進行準確控制。傳統(tǒng)的乳化液手動法配比和機械配比法由于配比精度低,操作復雜等缺點已被逐漸淘汰,現(xiàn)多用自動配液的方式。自動配液系統(tǒng)主要有雙缸定比配液系統(tǒng)、自力式自動配比系統(tǒng)、單片機控制配液系統(tǒng)以及PLC控制配液系統(tǒng)。雙缸定比配液系統(tǒng)由于缺少傳感器,無法對系統(tǒng)的配比濃度進行監(jiān)控;而自力式自動配比系統(tǒng)由于井下風壓、水壓不穩(wěn)定,配比精度無法保障;單片機控制的自動配液系統(tǒng)多為開環(huán)控制;而PLC控制的自動配液系統(tǒng)由于濃度傳感器在使用過程易受污染影響精度,故設計時不用濃度傳感器直接測量,而采用液位傳感器的方式對乳化液濃度進行間接測量,實質上乳化液充分混合后,濃度傳感器在清潔的情況下對系統(tǒng)乳化液濃度的精度把控遠高于液位傳感器,因此自動配液系統(tǒng)的改進需解決乳化液充分混合以及濃度傳感器污染的問題。基于以上問題,本文對乳化液自動配比系統(tǒng)做了以下幾方面的研究。首先對配液裝置整體進行了設計,配液裝置集乳化液箱和乳化油箱于一體,且為了整體美觀,將各類執(zhí)行機構和傳感器都嵌于配液裝置內部,各類器件在箱體內部都通過鋼管走線并匯總到接線盒內,配液裝置整體結構緊湊、簡潔、美觀。同時對配液裝置進行了壁厚優(yōu)化,在滿足使用條件的基礎上使箱體輕量化,節(jié)省成本的同時減少井下工人勞動量。接著對乳化液混合起關鍵作用的攪拌器進行數(shù)值模擬,比較圓盤式四直葉渦輪攪拌器、圓盤式45°渦輪攪拌器以及開式45°渦輪攪拌器完成配液的混合時間和能量消耗,結果表明開式45°渦輪攪拌器作用下,液箱體內部湍流強度最為均勻,混合完成時間最短以及混合消耗能量最少。同時就攪拌器的不同安裝高度對乳化液混合的影響進行了數(shù)值分析,當槳葉距底高度為250mm時,乳化液整體混合完成所需時間最短。其次就濃度傳感器的堵塞問題進行了探究,不同安裝位置以及箱體堵板不同的開孔形式在攪拌器的剪切作用下,都不足以對濃度傳感器起到?jīng)_洗的作用,故需要設置沖洗裝置進行傳感器的清洗。通過對比不同噴嘴的軸向速度分布以及傳感器感光元件壁面的動壓和打擊力,得出角型噴嘴形成的壁面動壓和打擊力最大,并在入口直徑為8mm、收縮角α為13°、出口直徑d為4mm、出口擴散角β為20°以及入口壓力為3MPa的參數(shù)條件下對濃度傳感器起到良好沖洗效果的結論。最后設計了基于濃度傳感器直接測量的自動控制系統(tǒng),完成了相應程序編寫和畫面組態(tài)。系統(tǒng)經(jīng)地面試驗和實際井下運行驗證均取得良好的效果。
[Abstract]:Emulsion is regarded as the blood of underground support equipment and plays an important role in coal mine. The concentration of emulsion is the key factor affecting its performance, so it is necessary to control the concentration of emulsion accurately. The traditional emulsion manual and mechanical proportioning methods have been gradually eliminated because of their low precision and complicated operation. The automatic liquid distribution system mainly consists of two cylinder fixed ratio distribution system, the self-powered automatic matching system, the single-chip microcomputer control liquid distribution system and the PLC control liquid distribution system. Due to the lack of sensors, the system can not monitor the concentration of the system, while the automatic matching system can not guarantee the precision because of the underground wind pressure, the water pressure is unstable and the matching precision can not be guaranteed. The automatic liquid distribution system controlled by single chip microcomputer is mostly open-loop control, and the automatic liquid distribution system controlled by PLC is designed without the direct measurement of concentration sensor because the concentration sensor is easily affected by pollution in the process of use. The emulsion concentration is indirectly measured by the liquid level sensor. In fact, after the emulsion is fully mixed, the concentration sensor controls the accuracy of the system emulsion concentration much higher than the liquid level sensor under the condition of cleaning. Therefore, the improvement of automatic liquid distribution system needs to solve the problems of sufficient mixing of emulsion and contamination of concentration sensor. Based on the above problems, this paper has done the following research on the emulsion automatic proportioning system. First of all, the whole liquid distribution device is designed. The liquid distribution device integrates the emulsion tank and the emulsified oil tank, and for the sake of overall beauty, all kinds of actuators and sensors are embedded in the liquid dispensing device. All kinds of devices are connected to the junction box through the steel pipe inside the box. The whole structure of the distribution device is compact, simple and beautiful. At the same time, the wall thickness of the liquid distribution device is optimized, which makes the box body lightweight on the basis of satisfying the operating conditions, saves the cost and reduces the labor quantity of the underground workers. Then, the mixing time and energy consumption of the four straight blade turbine agitator, the 45 擄disk turbine agitator and the open 45 擄turbine agitator are compared by numerical simulation of the agitator, which plays a key role in the emulsion mixing, and the energy consumption is compared between the four straight blade agitators, the disk 45 擄turbine agitators and the open 45 擄turbine agitators. The results show that under the action of open 45 擄turbine agitator, the turbulence intensity in the liquid tank is the most uniform, the mixing completion time is the shortest and the mixing energy consumption is the least. At the same time, the effect of different installation heights of agitator on the emulsion mixing is analyzed numerically. When the blade height is 250mm, the whole emulsion mixing takes the shortest time. Secondly, the clogging problem of the concentration sensor is explored. The different installation positions and the different opening forms of the box block plate are not enough to wash the concentration sensor under the shear action of the agitator. Therefore, it is necessary to set up a washing device to clean the sensor. By comparing the axial velocity distribution of different nozzles and the dynamic pressure and impact force of the sensor wall, it is concluded that the wall dynamic pressure and impact force formed by the angular nozzle is the largest. When the inlet diameter is 8 mm, the contraction angle 偽 is 13 擄, the outlet diameter is 4 mm, the outlet diffusion angle 尾 is 20 擄and the inlet pressure is 3MPa, a good washing effect is obtained for the concentration sensor. Finally, the automatic control system based on the direct measurement of concentration sensor is designed, and the corresponding program and picture configuration are completed. The system has been tested on the ground and proved to be effective in underground operation.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD350.4

【參考文獻】

相關期刊論文 前10條

1 袁繼成;王然風;高立志;黃光平;;基于FLUENT的乳化液配比攪拌器的選擇與研究[J];中國煤炭;2016年08期

2 周萬陽;于蘭英;鄧斌;吳文海;冉春燕;;基于CFD的地鐵隧道壁面沖洗扇形噴嘴的參數(shù)優(yōu)選[J];液壓氣動與密封;2015年09期

3 張安琪;劉清友;黃本生;;錐直形噴嘴噴射角度對鉆桿清洗質量的影響研究[J];機械設計;2015年08期

4 蔡海龍;馮凱;王然風;;乳化液自動配液系統(tǒng)的設計與實現(xiàn)[J];煤炭工程;2015年07期

5 何勇華;;綜采工作面乳化液自動配液系統(tǒng)的應用研究[J];中國煤炭;2014年06期

6 鄧志安;馬旭東;沈海靜;由洋;;不同形狀噴嘴的射流清洗數(shù)值模擬研究[J];石油機械;2014年04期

7 黨林貴;郭淑雪;王定標;張碩果;曹海亮;;不同組合槳攪拌器攪拌特性的數(shù)值研究[J];鄭州大學學報(工學版);2013年03期

8 郭西峰;;煤礦井下多功能乳化液箱的研究[J];機械管理開發(fā);2012年05期

9 倪邦慶;王秋實;范明明;;硅油乳狀液體系攪拌槽內混合過程的數(shù)值模擬[J];計算機與應用化學;2012年08期

10 趙四海;曲繼鵬;顏斌;劉志強;;節(jié)能型配比可調的乳化液質量分數(shù)自動配比裝置研制[J];機床與液壓;2012年08期

相關博士學位論文 前1條

1 徐依吉;超高壓水射流理論與應用基礎研究[D];西南石油學院;2004年

相關碩士學位論文 前9條

1 周萬陽;地鐵隧道清洗設備的結構研究和扇形噴嘴分析[D];西南交通大學;2016年

2 冉春燕;變電站絕緣子水沖洗噴嘴射流場特性研究[D];西南交通大學;2016年

3 蔡海龍;智能型乳化液自動供配液系統(tǒng)的研究與實現(xiàn)[D];太原理工大學;2015年

4 楊飛;高壓大流量節(jié)能乳化液泵站關鍵技術研究[D];太原理工大學;2014年

5 林尚飛;礦用乳化液自動配比系統(tǒng)研究[D];中國礦業(yè)大學;2014年

6 劉朝杰;仿人淚器的機器人視野清潔技術研究[D];哈爾濱工程大學;2013年

7 何洲;攪拌器內部流場特征的數(shù)值模擬研究[D];華東理工大學;2011年

8 孫淑芳;多功能乳化液箱的研究與開發(fā)[D];太原理工大學;2009年

9 宋理敏;乳化液自動配比及其應用研究[D];太原理工大學;2006年

，

本文編號：2261513