【摘要】：細(xì)粒煤分級技術(shù)是現(xiàn)階段礦物加工領(lǐng)域研究的熱點問題。三產(chǎn)品旋流分級篩作為一種新型高效的細(xì)粒煤分級設(shè)備,具有重要的研究價值和應(yīng)用前景。本論文核心研究內(nèi)容為三產(chǎn)品旋流分級篩篩網(wǎng)分級特性,通過理論分析和試驗研究獲得相應(yīng)結(jié)論,指導(dǎo)工業(yè)生產(chǎn)。理論分析意在描述三產(chǎn)品旋流分級篩內(nèi)部固液兩相流體的運動,指導(dǎo)試驗研究和工業(yè)應(yīng)用。一方面,根據(jù)已有研究成果和流體力學(xué)知識,分析內(nèi)部流場中液相流體和固相顆粒的運動特性,得出流場速度分布、壓力分布及固相顆粒分布規(guī)律;另一方面,從結(jié)構(gòu)特點入手,將分級過程分為內(nèi)部旋流分級過程和篩網(wǎng)分級過程,著重討論篩網(wǎng)分級過程,借助弧形篩透篩理論對篩網(wǎng)的工作原理和分級理論做了詳細(xì)闡述,并提出理論透篩粒度和篩網(wǎng)分級粒度的計算公式。試驗研究旨在總結(jié)三產(chǎn)品旋流分級篩試驗結(jié)果反映的結(jié)論,印證理論分析,作為生產(chǎn)規(guī)律應(yīng)用于工業(yè)生產(chǎn)。首先,選擇入料濃度、入料壓力、底流口直徑及兩兩交互作用進(jìn)行正交試驗,得到各因素對整機(jī)和篩網(wǎng)分級指標(biāo)影響的顯著性規(guī)律,確定最顯著因素為入料濃度和底流口直徑的交互作用;然后,對入料濃度和底流口直徑交互作用進(jìn)行試驗研究,得出該因素對分級指標(biāo)的影響規(guī)律,并通過數(shù)據(jù)分析獲得入料濃度和底流口直徑的最佳匹配關(guān)系滿足一元線性回歸方程?6 6,運用該關(guān)系可知在篩下分流比為68~70%時可取得理想分級效果;最后,整理已有試驗數(shù)據(jù),以工況條件為輸入?yún)?shù),分級評價指標(biāo)為輸出參數(shù),應(yīng)用BP神經(jīng)網(wǎng)絡(luò)建立相應(yīng)數(shù)學(xué)模型,驗證分析其整體誤差為8.49%,能夠滿足工業(yè)生產(chǎn)的精度要求。本論文的研究成果為深入研究三產(chǎn)品旋流分級篩分級原理打下了基礎(chǔ),同時也為該設(shè)備的工業(yè)化應(yīng)用起到了推動作用。
[Abstract]:Fine-grained coal classification technology is a hot issue in the field of mineral processing. As a new type of high-efficient fine coal classification equipment, the three-product swirl classifier has important research value and application prospect. The core of this thesis is the characteristics of three-product swirl sieve screen classification. The corresponding conclusions are obtained through theoretical analysis and experimental study to guide industrial production. The theoretical analysis is intended to describe the motion of solid-liquid two-phase fluid in the three-product swirl classifier and to guide the experimental study and industrial application. On the one hand, according to the existing research results and hydrodynamics knowledge, the movement characteristics of liquid fluid and solid particles in the internal flow field are analyzed, and the velocity distribution, pressure distribution and solid particle distribution law of the flow field are obtained. On the other hand, starting with the structural characteristics, the classification process is divided into the internal swirl flow classification process and the sieve mesh classification process. The working principle and the classification theory of the sieve mesh are described in detail with the help of the sieve screening theory. The formulas of theoretical sieve granularity and sieve mesh granularity are put forward. The purpose of the experimental study is to summarize the conclusion of the test results of the three-product swirl classifier and to confirm the theoretical analysis, which is applied to industrial production as the production law. First of all, the orthogonal experiments were carried out by selecting the feed concentration, feed pressure, bottom flow diameter and pairwise interaction, and obtained the significant law of the influence of each factor on the classification index of the whole machine and the screen mesh. The most significant factor is the interaction between feed concentration and bottom flow diameter. Then, the interaction between the feed concentration and the diameter of the bottom outlet is studied, and the influence of the factor on the grading index is obtained. Through the data analysis, the best matching relation between the feed concentration and the bottom outlet diameter is obtained, which satisfies the linear regression equation of one variable? 66. By using this relationship, the ideal classification effect can be obtained when the ratio of below sieve shunt ratio is 68 ~ 70. Finally, the existing experimental data are sorted out, the operating conditions are taken as input parameters and the grading evaluation indexes are used as output parameters. The corresponding mathematical model is established by using BP neural network, and the overall error of the analysis is 8.49. Can meet the precision requirements of industrial production. The research results of this paper lay a foundation for the further study of the principle of three-product swirl classification and screening, and also play a role in promoting the industrial application of the equipment.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD94;TD452

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