本文關(guān)鍵詞： 螺旋溜槽 煤泥 藥劑 格條 精煤灰分 數(shù)值模擬　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：為降低螺旋溜槽精煤產(chǎn)品灰分及其分選密度，提高螺旋溜槽精煤產(chǎn)率及其綜合分選效率，進行了普通界面煤泥螺旋溜槽分選規(guī)律試驗、藥劑作用下普通界面煤泥螺旋溜槽分選規(guī)律試驗以及格條作用下煤泥螺旋溜槽分選規(guī)律試驗。利用流體模擬軟件Fluent分別對無格條螺旋溜槽和格條螺旋溜槽的流場進行了數(shù)值模擬，計算模擬結(jié)果較好的解釋和驗證了試驗結(jié)果。 增大給料旋流器底流口直徑和入料壓力，螺旋溜槽各粒級精煤灰分升高，同時各粒級尾煤灰分、精煤產(chǎn)率及綜合效率也均升高，說明礦漿流量和入料濃度大小對螺旋溜槽分選效果影響較大。 聚乙二醇400、仲辛醇和煤油分別作用下，隨著藥劑添加量的增加，各粒級精煤灰分和綜合效率不斷降低，除最細0.074mm粒級精煤產(chǎn)率升高外，其他粒級精煤產(chǎn)率均不斷降低，說明三種藥劑分別作用下可有效降低螺旋溜槽精煤產(chǎn)品灰分，但綜合分選效果變差；煤油和仲辛醇共同作用下可降低粗粒級精煤灰分，沒有兩種藥劑單獨作用下效果好，但能提高細粒級分選效率。 2mm和3mm高度格條分別作用下，隨著格條數(shù)量的增加，粗粒級精煤灰分不斷降低，且后者降灰效果優(yōu)于前者，各粒級精煤產(chǎn)率和綜合效率均逐漸降低，4mm高度格條作用下粗粒級精煤灰分先降后升，可提高最粒級精煤產(chǎn)率，各粒級綜合效率變化不大。 格條外緣固定正角度時，3mm和4mm格條分別作用下各粒級精煤灰分和精煤產(chǎn)率顯著上升，在45°達到最大值，可提高粗粒級分選效率，但細粒級分選效率降低；負角度時兩種格條可降低粗粒級精煤灰分，同時精煤產(chǎn)率和綜合效率降低，而4mm高度格條可提高細粒級精煤產(chǎn)率，這一點優(yōu)于3mm高度格條，3mm高度格條作用下各粒級綜合效率降幅較大，4mm高度格條變化較小。格條內(nèi)緣固定正角度時，粗粒級精煤灰分、尾煤灰分、精煤產(chǎn)率和綜合效率均降低，且角度越小降幅越大，細粒級精煤灰分和精煤產(chǎn)率升高，尾煤灰分和綜合效率降低；負角度時各粒級精煤灰分、尾煤灰分、精煤產(chǎn)率和綜合效率均比無格條時高。 無格條螺旋溜槽流場模擬結(jié)果顯示，螺旋溜槽槽面上的水流沿外緣運動，存在二次環(huán)流，內(nèi)緣嚴(yán)重失水，這同光槽面螺旋溜槽實際流場相一致；鋪設(shè)有8條向內(nèi)緣導(dǎo)流螺旋溜槽流場模擬結(jié)果顯示，槽面上流體遇到格條后，，明顯向內(nèi)移動，在槽面上覆蓋面積顯著增大，外緣水層變薄，同試驗現(xiàn)象吻合，這也是精煤灰分和精煤產(chǎn)率降低的主要原因。 螺旋溜槽是較好的粗煤泥分選設(shè)備，合理確定藥劑制度和格條操作參數(shù)可達到降低螺旋溜槽精煤灰分和提高螺旋溜槽精煤產(chǎn)率和分選效率的目的。
[Abstract]:In order to reduce ash content and separation density of spiral chute clean coal product and improve the yield of spiral chute coal and its comprehensive separation efficiency, the separation law of common interface coal slime spiral chute was tested. The separation laws of common interface slime spiral chute and slime spiral chute under the action of fungicide and the slime spiral chute under the action of lattice strip were tested respectively by using the fluid simulation software Fluent. The flow field of the chute is simulated numerically. The experimental results are well explained and verified by the simulation results. With the increase of feed hydrocyclone bottom outlet diameter and feed pressure, the ash content of each grade of clean coal in spiral chute is increased, and the ash content of each grade of coal tail coal, the yield of clean coal and the comprehensive efficiency are also increased. The results show that slurry flow and feed concentration have great influence on the separation effect of spiral chute. Under the action of polyethylene glycol 400, para-octanol and kerosene, the ash content and comprehensive efficiency of each fine coal decreased with the increase of the amount of chemicals added, except that the yield of the finest 0.074 mm fine coal increased. The production rate of other fine coal has been decreasing, which shows that the ash content of spiral chute coal can be reduced effectively under the action of three kinds of chemicals respectively, but the comprehensive separation effect becomes worse. Coal oil and para-octanol can reduce the ash content of coarse-grained clean coal. The effect is good without two kinds of medicament alone, but it can improve the separation efficiency of fine grained coal. Under the action of 2 mm and 3 mm height bar respectively, with the increase of the number of the bars, the ash content of the coarse grained clean coal decreases continuously, and the ash reduction effect of the latter is better than that of the former, and the yield and comprehensive efficiency of each grain grade clean coal decrease gradually. Under the action of 4mm height bar, the ash content of coarse-grained clean coal decreases first and then rises, which can increase the yield of the most granular clean coal, and the comprehensive efficiency of each grain-grade coal does not change much. Under the action of 3mm and 4mm bars respectively, the ash content and the yield of clean coal increased significantly, and reached the maximum value at 45 擄, which can improve the separation efficiency of coarse grain. However, the separation efficiency of fine particles was decreased. When the angle is negative, the ash content of coarse-grained clean coal can be reduced, while the yield and comprehensive efficiency of clean coal can be reduced, while the yield of fine grained clean coal can be increased by 4mm height bar, which is better than that of 3mm height bar. Under the action of 3mm height bar, the decrease of the comprehensive efficiency of each grain level is larger than that of the 4mm height bar. When the inner edge of the grid is fixed at a straight angle, the ash content of the coarse grained clean coal and the coal ash content of the tail coal are fixed. The yield and comprehensive efficiency of clean coal are both decreased, and the smaller the angle is, the bigger the decrease is, the higher the ash and the yield of fine coal are, the lower the coal ash content and comprehensive efficiency of tail coal are. The ash content, tail coal ash content, clean coal yield and comprehensive efficiency are higher at negative angle than those without grid. The simulation results show that the flow on the helical chute surface moves along the outer edge with secondary circulation and serious loss of water in the inner edge, which is consistent with the actual flow field of the helical chute on the optical slot surface. The flow field simulation results show that the fluid on the slot surface moves inward obviously after it meets the grid, and the coverage area on the groove surface increases significantly, and the water layer on the outer edge becomes thinner, which coincides with the experimental phenomenon. This is also the main reason for the decrease of ash and yield of clean coal. Spiral chute is a good equipment for separating coarse coal slime. Reasonably determining the medicament system and the operation parameters of the sliver can reduce the ash content of the spiral chute and improve the yield and separation efficiency of the coals in the spiral chute.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD94

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