永磁場調(diào)控重介旋流器分選密度的磁系優(yōu)化研究
發(fā)布時間：2019-01-08 07:24
【摘要】：作為一種高效的分選設(shè)備，三產(chǎn)品重介旋流器在選煤行業(yè)得到了廣泛的應(yīng)用。然而三產(chǎn)品重介旋流器二段分選密度難以在線調(diào)控的技術(shù)難題一直是選煤工業(yè)中亟待解決的核心問題。本論文利用釹鐵硼永磁體構(gòu)建徑向永磁場作用于重介旋流器，進(jìn)行了永磁場調(diào)控重介旋流器分選密度的磁系優(yōu)化研究。 研究了四磁極交替（N-S-N-S）對稱布置的二倍磁系和六磁極交替（N-S-N-S-N-S）對稱布置的三倍磁系作用于重介旋流器不同位置時的介質(zhì)分配規(guī)律。研究表明：二倍磁系和三倍磁系永磁場的設(shè)置，能夠影響旋流器的介質(zhì)分配，隨著磁系厚度的增加，溢流密度和底流密度變化更明顯。 進(jìn)行了二倍磁系作用于重介旋流器溢流管、圓柱下端、錐部上端、錐部中間、錐部下端和底流口時的粗煤泥分選試驗，研究了不同磁系厚度的二倍磁系作用于旋流器不同位置時對其分選密度的影響規(guī)律。研究表明：二倍磁系作用于溢流管能夠降低旋流器的分選密度；作用于底流口能夠提高旋流器的分選密度；作用于旋流器圓柱下端和錐部上端時，永磁場作用會破壞旋流器的正常分選；作用于錐部下端時，調(diào)控效果最佳，隨著磁系厚度的變化，能夠?qū)崿F(xiàn)分選密度的雙向調(diào)控。 進(jìn)行了三倍磁系作用于重介旋流器溢流管和錐部下端的粗煤泥分選試驗，研究了不同磁系厚度的三倍磁系作用于旋流器不同位置對其分選密度的影響規(guī)律。研究表明：三倍磁系永磁場作用于溢流管能夠降低旋流器的分選密度，且作用效果比二倍磁系更好；作用于錐部下端時，隨著磁系厚度的變化，也能夠?qū)崿F(xiàn)分選密度的雙向調(diào)控。 設(shè)計了I號齒板和II號齒板，與釹鐵硼永磁體有效結(jié)合，構(gòu)建了兩種四磁極交替布置的高梯度磁系，并利用高梯度磁系作用于旋流器溢流管、錐部下端和底流口，研究了不同磁系厚度的高梯度磁系永磁場對作用于旋流器不同位置時的介質(zhì)分配規(guī)律。研究表明：兩種高梯度磁系永磁場的設(shè)置，，也能夠影響旋流器的介質(zhì)分配，隨著磁系厚度的增加，溢流密度和底流密度變化更明顯。 進(jìn)行了I號齒板和II號齒板高梯度磁系作用于重介旋流器溢流管、錐部下端和底流口的粗煤泥分選試驗，研究了不同磁系厚度的兩種高梯度磁系作用于旋流器不同位置對其分選密度的影響規(guī)律。研究表明：作用于底流口時，高梯度磁系作用效果比普通二倍磁系作用效果更好，且I號齒板高梯度磁系優(yōu)于II號齒板高梯度磁系。 借助ANSYS軟件的電磁場分析功能，研究了二倍磁系、三倍磁系的磁場特性。模擬結(jié)果表明：磁系厚度越大，磁系顆粒所受磁場力越大，且三倍磁系比二倍磁系的磁力線分布更均勻、更密集，更又有利于磁性顆粒的吸附。模擬結(jié)果初步揭示了永磁場調(diào)控重介旋流器分選密度的原因在于永磁場的設(shè)置強(qiáng)化了磁性顆粒向旋流器內(nèi)壁的運(yùn)移和富集。
[Abstract]:As an efficient separation equipment, three-product heavy-medium cyclone has been widely used in coal preparation industry. However, the technical problem that the two-stage separation density of three-product heavy media cyclone is difficult to control on line is always the core problem to be solved urgently in coal preparation industry. In this paper, the radial permanent magnetic field is used to construct a radial permanent magnetic field to control the separation density of the heavy medium cyclone, and the optimization of the magnetic system is carried out. The dielectric distribution law of the double magnetic system with four pole alternating (N-S-N-S) symmetry arrangement and the triple magnetic system with six magnetic pole alternation (N-S-N-S) symmetry arrangement with different positions is studied. The results show that the permanent magnetic field of the secondary and triple magnetic systems can affect the distribution of the medium of the cyclone. With the increase of the thickness of the magnetic system, the overflow density and the bottom current density change more obviously. The separation tests of coarse coal slime on the overflow tube, the lower cylinder, the upper end of the cone, the middle of the cone, the lower end of the cone and the bottom outlet of the double magnetic system are carried out. The influence of double magnetic system with different thickness of magnetic system on the separation density of hydrocyclone is studied. The results show that the separation density of cyclone can be reduced by the action of double magnetic system on overflow tube, and the separation density of cyclone can be increased by acting on bottom flow port. When acting on the lower end of the cylinder and the upper end of the cone, the permanent magnetic field will destroy the normal separation of the cyclone, and when acting on the lower end of the cone, the control effect is the best, and with the change of the thickness of the magnetic system, the bidirectional control of the separation density can be realized. The separation experiments of coarse coal slime with triple magnetic system acting on the overflow tube and the lower end of the cone are carried out, and the influence of different magnetic system thickness on the separation density of the cyclone is studied. The results show that the separation density of cyclone can be reduced by the permanent magnetic field acting on the overflow tube, and the effect is better than that of the double magnetic system. When acting on the lower end of the cone, the separation density can be controlled bidirectional with the change of magnetic system thickness. I tooth plate and II tooth plate are designed and combined effectively with NdFeB permanent magnet. Two kinds of high gradient magnetic systems with alternating magnetic poles are constructed, and the high gradient magnetic system is applied to the overflow tube of cyclone, the lower end of cone and the bottom flow port. The dielectric distribution law of high gradient magnetic system permanent magnetic field pair acting on different positions of hydrocyclone with different thickness of magnetic system is studied. The results show that the permanent magnetic field of the two high gradient magnetic systems can also affect the dielectric distribution of the hydrocyclone. With the increase of the thickness of the magnetic system, the overflow density and the bottom current density change more obviously. The separation tests of coarse coal slime with I tooth plate and II tooth plate high gradient magnetic system on overflow tube, lower cone end and bottom flow port of heavy dielectric cyclone were carried out. The influence of two kinds of high gradient magnetic systems with different thickness of magnetic system on the separation density of hydrocyclone was studied. The results show that the effect of high gradient magnetic system is better than that of ordinary double magnetic system when acting on the bottom flow, and the high gradient magnetic system of I tooth plate is better than that of II tooth plate high gradient magnetic system. With the help of the electromagnetic field analysis function of ANSYS software, the magnetic field characteristics of the double magnetic system and the triple magnetic system are studied. The simulation results show that the greater the thickness of the magnetic system, the greater the magnetic force of the magnetic system particles, and the distribution of the magnetic force line of the triple magnetic system is more uniform, denser and more favorable to the adsorption of magnetic particles than that of the double magnetic system. The simulation results show that the permanent magnet field controls the separation density of the heavy medium cyclone because the permanent magnetic field enhances the migration and enrichment of magnetic particles to the inner wall of the cyclone.
【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】：TD455
本文編號：2404296
[Abstract]:As an efficient separation equipment, three-product heavy-medium cyclone has been widely used in coal preparation industry. However, the technical problem that the two-stage separation density of three-product heavy media cyclone is difficult to control on line is always the core problem to be solved urgently in coal preparation industry. In this paper, the radial permanent magnetic field is used to construct a radial permanent magnetic field to control the separation density of the heavy medium cyclone, and the optimization of the magnetic system is carried out. The dielectric distribution law of the double magnetic system with four pole alternating (N-S-N-S) symmetry arrangement and the triple magnetic system with six magnetic pole alternation (N-S-N-S) symmetry arrangement with different positions is studied. The results show that the permanent magnetic field of the secondary and triple magnetic systems can affect the distribution of the medium of the cyclone. With the increase of the thickness of the magnetic system, the overflow density and the bottom current density change more obviously. The separation tests of coarse coal slime on the overflow tube, the lower cylinder, the upper end of the cone, the middle of the cone, the lower end of the cone and the bottom outlet of the double magnetic system are carried out. The influence of double magnetic system with different thickness of magnetic system on the separation density of hydrocyclone is studied. The results show that the separation density of cyclone can be reduced by the action of double magnetic system on overflow tube, and the separation density of cyclone can be increased by acting on bottom flow port. When acting on the lower end of the cylinder and the upper end of the cone, the permanent magnetic field will destroy the normal separation of the cyclone, and when acting on the lower end of the cone, the control effect is the best, and with the change of the thickness of the magnetic system, the bidirectional control of the separation density can be realized. The separation experiments of coarse coal slime with triple magnetic system acting on the overflow tube and the lower end of the cone are carried out, and the influence of different magnetic system thickness on the separation density of the cyclone is studied. The results show that the separation density of cyclone can be reduced by the permanent magnetic field acting on the overflow tube, and the effect is better than that of the double magnetic system. When acting on the lower end of the cone, the separation density can be controlled bidirectional with the change of magnetic system thickness. I tooth plate and II tooth plate are designed and combined effectively with NdFeB permanent magnet. Two kinds of high gradient magnetic systems with alternating magnetic poles are constructed, and the high gradient magnetic system is applied to the overflow tube of cyclone, the lower end of cone and the bottom flow port. The dielectric distribution law of high gradient magnetic system permanent magnetic field pair acting on different positions of hydrocyclone with different thickness of magnetic system is studied. The results show that the permanent magnetic field of the two high gradient magnetic systems can also affect the dielectric distribution of the hydrocyclone. With the increase of the thickness of the magnetic system, the overflow density and the bottom current density change more obviously. The separation tests of coarse coal slime with I tooth plate and II tooth plate high gradient magnetic system on overflow tube, lower cone end and bottom flow port of heavy dielectric cyclone were carried out. The influence of two kinds of high gradient magnetic systems with different thickness of magnetic system on the separation density of hydrocyclone was studied. The results show that the effect of high gradient magnetic system is better than that of ordinary double magnetic system when acting on the bottom flow, and the high gradient magnetic system of I tooth plate is better than that of II tooth plate high gradient magnetic system. With the help of the electromagnetic field analysis function of ANSYS software, the magnetic field characteristics of the double magnetic system and the triple magnetic system are studied. The simulation results show that the greater the thickness of the magnetic system, the greater the magnetic force of the magnetic system particles, and the distribution of the magnetic force line of the triple magnetic system is more uniform, denser and more favorable to the adsorption of magnetic particles than that of the double magnetic system. The simulation results show that the permanent magnet field controls the separation density of the heavy medium cyclone because the permanent magnetic field enhances the migration and enrichment of magnetic particles to the inner wall of the cyclone.
【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】：TD455
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