本文選題：振動流化床 + 加重質(zhì)�。� 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：日益嚴(yán)峻的環(huán)境問題要求煤的洗選必須大力加強(qiáng),而目前水資源匱乏的局勢又制約著傳統(tǒng)濕法選煤的發(fā)展,因此,亟需高效的干法分選技術(shù),空氣重介質(zhì)流化床選煤工藝已經(jīng)被證明可以有效分選+6mm粒級煤,E值為0.05-0.08,但對于粒度小于6mm粒級的細(xì)粒煤,傳統(tǒng)流化床不能滿足分選要求,將振動能量引入流化床可顯著提高流化床均勻穩(wěn)定性和對細(xì)粒煤的分選效果。本論文搭建了間歇式振動流化床分選系統(tǒng),通過繪制流化曲線的方法研究了在不同振動強(qiáng)度和不同加重質(zhì)的情況下的流化床的流化特性,研究證明,振動能量的引入能顯著減小最小流化氣速,降低壓力波動,增加床層穩(wěn)定性;磁鐵礦粉中加入石英砂作為混合加重質(zhì)時,最小流化速度和壓降隨著石英砂質(zhì)量比的增大而減小。在對6-3mm粒級煤做單因素探索試驗的基礎(chǔ)上,利用Design-expert軟件響應(yīng)曲面法中的Box-Behnken分析方法分別對6-3mm,3-2mm,2-1mm,1-0.5mm四個粒級做三因素三水平正交試驗,研究指出,分選效果隨粒度的減小而變差,對于6-3mm粒級煤,在保證精煤灰分低于4.65%的情況下,可燃體回收率高達(dá)86%;對于1-0.5mm粒級煤,在保證精煤灰分低于18%的情況下,可使可燃體回收率維持在70%左右。通過將四個粒級煤按質(zhì)量比等量混合研究振動流化床對混合粒級煤的分選效果,由試驗結(jié)果可知,振動床對3-2mm,2-1mm,1-0.5mm三個粒級的分選效果優(yōu)于分級入選,說明6-3mm粒級煤的存在可以提高振動流化床對3-0.5mm粒級煤的分選效果。在磁鐵礦粉中加入不同質(zhì)量的石英砂作為混合加重質(zhì)時,研究了振動流化床對2-1mm粒級煤的分選效果,結(jié)果為當(dāng)磁鐵礦粉與石英砂質(zhì)量比值為2:0.3時分選效果最佳,此時精煤灰分8.47%,可燃體回收率91.86%,因此在磁鐵礦粉中摻入定量的石英砂可提高振動流化床對細(xì)粒級煤的分選效果。通過混合加重質(zhì)流化床對四個粒級煤的分選浮沉試驗確定了每個粒級的E值,分選結(jié)果顯示振動流化床對6-3mm,3-2mm,2-1mm,1-0.5mm四個粒級煤分選的E值分別為:0.090,0.127,0137,0.270 g/cm3。
[Abstract]:The increasingly severe environmental problems require that the washing and separation of coal must be greatly strengthened, and the current situation of water resources shortage restricts the development of traditional wet coal preparation. Therefore, it is urgent to develop efficient dry separation technology. It has been proved that the air heavy medium fluidized bed coal preparation process can effectively separate the 6mm granular coal with E value of 0.05-0.08, but the traditional fluidized bed can not meet the separation requirements for the fine coal with particle size smaller than 6mm. The uniform stability of fluidized bed and the separation effect of fine coal can be improved by introducing vibration energy into fluidized bed. In this paper, an intermittent vibrating fluidized bed separation system is built. The fluidization characteristics of fluidized bed with different vibration intensity and different aggravation are studied by drawing fluidization curve. The introduction of vibration energy can significantly reduce the minimum fluidized gas velocity, reduce the pressure fluctuation, and increase the stability of the bed, and the minimum fluidization velocity and pressure drop decrease with the increase of the mass ratio of quartz sand when the quartz sand is added into the magnetite powder as the mixed admixture. On the basis of the single factor exploration test of 6-3mm grained coal, using the Box-Behnken analysis method of Design-expert software response surface method, three factors and three levels orthogonal tests were made on four grain grades of 6-3mm / 3-2mm / 2-1mm / (1-0.5mm) respectively. It is pointed out that the separation effect becomes worse with the decrease of particle size. For 6-3mm grained coal, the recovery rate of combustible coal is as high as 86% when the ash content of clean coal is less than 4.65%, and 70% for 1-0.5mm coal with ash content less than 18%. The separation effect of vibrating fluidized bed on mixed coal is studied by mixing the four grained coals in the same quantity according to mass ratio. From the experimental results, it can be seen that the separation effect of vibrating bed on 3-2mm / 2-1mm / 1-0.5mm is better than that of classifying. It shows that the existence of 6-3mm granular coal can improve the separation efficiency of 3-0.5mm granular coal by vibrating fluidized bed. The separation effect of 2-1mm grained coal by vibrating fluidized bed was studied when different quality quartz sand was added to magnetite powder as mixed weight. The results showed that the separation effect was the best when the mass ratio of magnetite powder to quartz sand was 2: 0.3. The ash content of clean coal is 8.47 and the recovery rate of combustible coal is 91.86. Therefore, adding quantitative quartz sand into magnetite powder can improve the separation effect of fine coal in vibrating fluidized bed. The E value of each particle level was determined by flotation and subsidence test of mixed aggravation fluidized bed for four grained coals. The separation results showed that the E value of vibrating fluidized bed for 6-3mm / 3-2mm / 2-1mm / (1-0.5mm) separation of four grained coals was: 1 / 0.090 / 0.127 / 0137/ 0.270 g / cm ~ (3), respectively.
【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

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