【摘要】：粗煤泥顆粒的高效物理分選與回收對(duì)于資源循環(huán)利用和環(huán)境保護(hù)具有重要的意義。本文以粗煤泥物料為分選研究對(duì)象,研究粗煤泥物料的宏觀密度組成和粒度組成,得到物料的密度組成和粒度組成數(shù)據(jù)。微觀角度,借助掃描電鏡對(duì)分選前后物料樣品進(jìn)行拍照,運(yùn)用JMicro Vision軟件分析微觀狀態(tài)下,粗煤泥顆粒的一維和二維灰度變化情況,直觀表述出粗煤泥顆粒性質(zhì)以及分選前后粗煤泥物質(zhì)組成成分的微觀變化。同時(shí),借助X射線熒光光譜分析技術(shù)定量分析粗煤泥分選前后物料組成成分的遷移變化,為驗(yàn)證粗煤泥分選的可行性提供先進(jìn)技術(shù)支撐。采用新型變徑液固流化床分選系統(tǒng)分選粗煤泥,具有重要的實(shí)際意義和應(yīng)用價(jià)值�；诖置耗辔锪现忻禾颗c矸石顆粒的較大密度差異,針對(duì)粗煤泥物料的分選,設(shè)計(jì)新型模塊化變徑液固流化床分選機(jī),建立新型結(jié)構(gòu)化變徑液固流化床分選系統(tǒng),包括模塊化設(shè)計(jì)分選機(jī)和配套設(shè)備。研究顆粒及顆粒群在變徑液固流化床分選機(jī)中弛豫現(xiàn)象,首先詳細(xì)分析單顆粒在流體弛豫過程的受力情況,通過對(duì)比確定粗煤泥顆粒在變徑液固流化床分選系統(tǒng)中主要受力,忽略次要受力。針對(duì)顆粒群弛豫,提出顆粒群運(yùn)動(dòng)過程中顆粒所受阻力阻力系數(shù)僅與顆粒附近流體流動(dòng)雷諾數(shù)有關(guān)的假設(shè)。同時(shí),介尺度分析能量最小原理的基礎(chǔ)上,提出顆粒聚團(tuán)局部能量最小平衡原理假設(shè),分析解釋顆粒流體系統(tǒng)中顆粒聚團(tuán)行為。采用FLUENT軟件與EDEM耦合計(jì)算,研究變徑液固流化床分選粗煤泥過程中顆粒的運(yùn)動(dòng)情況以及床體內(nèi)部流場的變化。通過分析顆粒運(yùn)動(dòng)情況,獲得不同顆粒在床體中運(yùn)動(dòng)的速度變化,軌跡變化情況。在水流作用區(qū)域中,不同密度的顆粒在水流的作用下實(shí)現(xiàn)分離和分選。然而當(dāng)顆粒沿壁面運(yùn)動(dòng)時(shí),不同顆粒聚集在一起,影響顆粒的分離過程。為了解決顆粒在壁面聚集的問題。本章探究頂水孔的加入對(duì)于顆粒分選的影響。通過利用FLUENT軟件分頂水對(duì)變徑液固流化床中流場分布的影響,以及頂水對(duì)壁面附件區(qū)域流體速度場的影響,驗(yàn)證頂水孔的可行性和有效性。采用變徑液固流化床分選系統(tǒng)實(shí)現(xiàn)對(duì)-3+0.5mm粗煤泥物料的分選和有效回收。在考察傾斜角度、水流量、給料濃度、給料速度和溢流流量對(duì)粗煤泥可燃體回收率影響的基礎(chǔ)上,確定傾斜角度、水流量和給料濃度為可控主要影響因素,借助正交試驗(yàn)設(shè)計(jì)軟件,設(shè)計(jì)并開展三因素三水平正交試驗(yàn)。確定影響因素的最佳水平和水平最佳組合。借助掃描電極分析和X射線熒光光譜分析技術(shù),對(duì)分選前后物料進(jìn)行分析測試,分析結(jié)果表明:變徑液固流化床分選系統(tǒng)能夠有效實(shí)現(xiàn)粗煤泥矸石的脫出和可燃體的高效回收。根據(jù)變徑液固流化床分選系統(tǒng)溢流流量變化的特點(diǎn),探索模糊神經(jīng)網(wǎng)絡(luò)控制在溢流流量控制中的應(yīng)用,對(duì)于非線性、多變量的變徑液固流化床分選系統(tǒng),本文構(gòu)建了雙輸入單輸出的自適應(yīng)模糊神經(jīng)網(wǎng)絡(luò)控制系統(tǒng),利用MATLAB/Simulink軟件對(duì)控制系統(tǒng)進(jìn)行建模與仿真計(jì)算,優(yōu)化控制系統(tǒng),得到合適的控制參數(shù)。仿真結(jié)果顯示:自適應(yīng)模糊神經(jīng)網(wǎng)絡(luò)控制器具有比模糊控制器更加快速的反應(yīng)時(shí)間,同時(shí)超調(diào)量比較小。這將提高控制系統(tǒng)的反應(yīng)能力以及魯棒性,減少穩(wěn)態(tài)誤差。模型控制過程非常平穩(wěn)快速。
[Abstract]:High efficient physical separation and recovery of coarse slime particles is of great significance for resource recycling and environmental protection. In this paper, coarse slime materials are selected as the research object, the macro-density and particle size composition of coarse slime materials are studied, and the data of density and particle size composition are obtained. The material samples were photographed before and after sorting, and the changes of one-dimensional and two-dimensional gray levels of coarse slime particles in micro-state were analyzed by JMicro Vision software. The properties of coarse slime particles and the Micro-changes of components of coarse slime before and after sorting were described intuitively. It is of great practical significance and application value to adopt a new type of variable diameter liquid-solid fluidized bed separation system to separate coarse coal slime. Based on the large density difference between coal and gangue particles in coarse coal slime materials, the separation of coarse coal slime materials is aimed at. A new type of modular variable-diameter liquid-solid fluidized bed separator was designed and a new type of structured variable-diameter liquid-solid fluidized bed separator was established, including modular design separator and supporting equipment. The main force of coarse slime particles in the variable-diameter liquid-solid fluidized bed separation system is determined by comparison, and the secondary force is neglected. The assumption that the drag coefficient of particles in the process of particle group movement is only related to the Reynolds number of fluid flow near the particles is proposed. Based on the hypothesis of local energy minimization equilibrium of particle agglomeration, the behavior of particle agglomeration in granular fluid system is analyzed and explained. The movement of particles and the change of flow field in the bed during the separation of coarse slime in a variable-diameter liquid-solid fluidized bed are studied by using FLUENT software coupled with EDEM. In order to solve the problem of particle aggregation on the wall, this chapter explores the addition of top water holes. The feasibility and validity of the top hole are verified by the influence of the top water on the flow field distribution in the variable diameter liquid-solid fluidized bed and the influence of the top water on the fluid velocity field in the wall appendage area. Efficiency recovery. On the basis of investigating the effects of inclination angle, water flow rate, feed concentration, feed rate and overflow flow rate on the recovery rate of coarse slime combustible, the inclination angle, water flow rate and feed concentration are determined as the main controllable factors. Three factors and three levels orthogonal test are designed and carried out with the help of orthogonal experimental design software. By means of scanning electrode analysis and X-ray fluorescence spectrometry, the material before and after separation is analyzed and tested. The results show that the variable diameter liquid-solid fluidized bed separation system can effectively realize the removal of coarse coal gangue and the efficient recovery of combustible materials. In this paper, the characteristics of overflow flow flow are discussed, and the application of fuzzy neural network control in overflow flow flow control is explored. For the non-linear and multi-variable variable diameter liquid-solid fluidized bed separation system, a dual-input and single-output adaptive fuzzy neural network control system is constructed. The control system is modeled and simulated by MATLAB/Simulink software. The simulation results show that the adaptive fuzzy neural network controller has faster response time and less overshoot than the fuzzy controller. This will improve the response ability and robustness of the control system and reduce the steady-state error.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD94

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 王培銘;豐曙霞;劉賢萍;;背散射電子圖像分析在水泥基材料微觀結(jié)構(gòu)研究中的應(yīng)用[J];硅酸鹽學(xué)報(bào);2011年10期

2 石常省,王澤南,謝廣元;煤泥分級(jí)浮選工藝的研究與實(shí)踐[J];煤炭工程;2005年03期

3 M.W.米凱爾 ,李國森;螺旋分選機(jī)和水介質(zhì)旋流器洗選粉煤的評(píng)價(jià)與應(yīng)用[J];選煤技術(shù);1991年01期

4 韓云;世界四座最大選煤廠[J];選煤技術(shù);2002年04期

5 劉文禮;陳子彤;位革老;任桂飛;王學(xué)民;;干擾床分選機(jī)分選粗煤泥的規(guī)律研究[J];選煤技術(shù);2007年04期

6 ;New progress in the processing and efficient utilization of coal[J];Mining Science and Technology;2011年04期

相關(guān)博士學(xué)位論文 前1條

1 王帥;電廠磨機(jī)返料在稀相振動(dòng)氣固流化床中的顆粒分離行為[D];中國礦業(yè)大學(xué);2013年

，

本文編號(hào)：2244306